diff options
Diffstat (limited to 'portaudio/src/hostapi/alsa/pa_linux_alsa.c')
| -rw-r--r-- | portaudio/src/hostapi/alsa/pa_linux_alsa.c | 4659 |
1 files changed, 0 insertions, 4659 deletions
diff --git a/portaudio/src/hostapi/alsa/pa_linux_alsa.c b/portaudio/src/hostapi/alsa/pa_linux_alsa.c deleted file mode 100644 index a66f90d..0000000 --- a/portaudio/src/hostapi/alsa/pa_linux_alsa.c +++ /dev/null @@ -1,4659 +0,0 @@ -/* - * $Id$ - * PortAudio Portable Real-Time Audio Library - * Latest Version at: http://www.portaudio.com - * ALSA implementation by Joshua Haberman and Arve Knudsen - * - * Copyright (c) 2002 Joshua Haberman <joshua@haberman.com> - * Copyright (c) 2005-2009 Arve Knudsen <arve.knudsen@gmail.com> - * Copyright (c) 2008 Kevin Kofler <kevin.kofler@chello.at> - * - * Based on the Open Source API proposed by Ross Bencina - * Copyright (c) 1999-2002 Ross Bencina, Phil Burk - * - * Permission is hereby granted, free of charge, to any person obtaining - * a copy of this software and associated documentation files - * (the "Software"), to deal in the Software without restriction, - * including without limitation the rights to use, copy, modify, merge, - * publish, distribute, sublicense, and/or sell copies of the Software, - * and to permit persons to whom the Software is furnished to do so, - * subject to the following conditions: - * - * The above copyright notice and this permission notice shall be - * included in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. - * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR - * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF - * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION - * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - */ - -/* - * The text above constitutes the entire PortAudio license; however, - * the PortAudio community also makes the following non-binding requests: - * - * Any person wishing to distribute modifications to the Software is - * requested to send the modifications to the original developer so that - * they can be incorporated into the canonical version. It is also - * requested that these non-binding requests be included along with the - * license above. - */ - -/** - @file - @ingroup hostapi_src -*/ - -#define ALSA_PCM_NEW_HW_PARAMS_API -#define ALSA_PCM_NEW_SW_PARAMS_API -#include <alsa/asoundlib.h> -#undef ALSA_PCM_NEW_HW_PARAMS_API -#undef ALSA_PCM_NEW_SW_PARAMS_API - -#include <sys/poll.h> -#include <string.h> /* strlen() */ -#include <limits.h> -#include <math.h> -#include <pthread.h> -#include <signal.h> -#include <time.h> -#include <sys/mman.h> -#include <signal.h> /* For sig_atomic_t */ -#ifdef PA_ALSA_DYNAMIC - #include <dlfcn.h> /* For dlXXX functions */ -#endif - -#include "portaudio.h" -#include "pa_util.h" -#include "pa_unix_util.h" -#include "pa_allocation.h" -#include "pa_hostapi.h" -#include "pa_stream.h" -#include "pa_cpuload.h" -#include "pa_process.h" -#include "pa_endianness.h" -#include "pa_debugprint.h" - -#include "pa_linux_alsa.h" - -/* Add missing define (for compatibility with older ALSA versions) */ -#ifndef SND_PCM_TSTAMP_ENABLE - #define SND_PCM_TSTAMP_ENABLE SND_PCM_TSTAMP_MMAP -#endif - -/* Combine version elements into a single (unsigned) integer */ -#define ALSA_VERSION_INT(major, minor, subminor) ((major << 16) | (minor << 8) | subminor) - -/* The acceptable tolerance of sample rate set, to that requested (as a ratio, eg 50 is 2%, 100 is 1%) */ -#define RATE_MAX_DEVIATE_RATIO 100 - -/* Defines Alsa function types and pointers to these functions. */ -#define _PA_DEFINE_FUNC(x) typedef typeof(x) x##_ft; static x##_ft *alsa_##x = 0 - -/* Alloca helper. */ -#define __alsa_snd_alloca(ptr,type) do { size_t __alsa_alloca_size = alsa_##type##_sizeof(); (*ptr) = (type##_t *) alloca(__alsa_alloca_size); memset(*ptr, 0, __alsa_alloca_size); } while (0) - -_PA_DEFINE_FUNC(snd_pcm_open); -_PA_DEFINE_FUNC(snd_pcm_close); -_PA_DEFINE_FUNC(snd_pcm_nonblock); -_PA_DEFINE_FUNC(snd_pcm_frames_to_bytes); -_PA_DEFINE_FUNC(snd_pcm_prepare); -_PA_DEFINE_FUNC(snd_pcm_start); -_PA_DEFINE_FUNC(snd_pcm_resume); -_PA_DEFINE_FUNC(snd_pcm_wait); -_PA_DEFINE_FUNC(snd_pcm_state); -_PA_DEFINE_FUNC(snd_pcm_avail_update); -_PA_DEFINE_FUNC(snd_pcm_areas_silence); -_PA_DEFINE_FUNC(snd_pcm_mmap_begin); -_PA_DEFINE_FUNC(snd_pcm_mmap_commit); -_PA_DEFINE_FUNC(snd_pcm_readi); -_PA_DEFINE_FUNC(snd_pcm_readn); -_PA_DEFINE_FUNC(snd_pcm_writei); -_PA_DEFINE_FUNC(snd_pcm_writen); -_PA_DEFINE_FUNC(snd_pcm_drain); -_PA_DEFINE_FUNC(snd_pcm_recover); -_PA_DEFINE_FUNC(snd_pcm_drop); -_PA_DEFINE_FUNC(snd_pcm_area_copy); -_PA_DEFINE_FUNC(snd_pcm_poll_descriptors); -_PA_DEFINE_FUNC(snd_pcm_poll_descriptors_count); -_PA_DEFINE_FUNC(snd_pcm_poll_descriptors_revents); -_PA_DEFINE_FUNC(snd_pcm_format_size); -_PA_DEFINE_FUNC(snd_pcm_link); -_PA_DEFINE_FUNC(snd_pcm_delay); - -_PA_DEFINE_FUNC(snd_pcm_hw_params_sizeof); -_PA_DEFINE_FUNC(snd_pcm_hw_params_malloc); -_PA_DEFINE_FUNC(snd_pcm_hw_params_free); -_PA_DEFINE_FUNC(snd_pcm_hw_params_any); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_access); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_format); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_channels); -//_PA_DEFINE_FUNC(snd_pcm_hw_params_set_periods_near); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_rate_near); //!!! -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_rate); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_rate_resample); -//_PA_DEFINE_FUNC(snd_pcm_hw_params_set_buffer_time_near); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_buffer_size); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_buffer_size_near); //!!! -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_buffer_size_min); -//_PA_DEFINE_FUNC(snd_pcm_hw_params_set_period_time_near); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_period_size_near); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_periods_integer); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_periods_min); - -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_buffer_size); -//_PA_DEFINE_FUNC(snd_pcm_hw_params_get_period_size); -//_PA_DEFINE_FUNC(snd_pcm_hw_params_get_access); -//_PA_DEFINE_FUNC(snd_pcm_hw_params_get_periods); -//_PA_DEFINE_FUNC(snd_pcm_hw_params_get_rate); -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_channels_min); -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_channels_max); - -_PA_DEFINE_FUNC(snd_pcm_hw_params_test_period_size); -_PA_DEFINE_FUNC(snd_pcm_hw_params_test_format); -_PA_DEFINE_FUNC(snd_pcm_hw_params_test_access); -_PA_DEFINE_FUNC(snd_pcm_hw_params_dump); -_PA_DEFINE_FUNC(snd_pcm_hw_params); - -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_periods_min); -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_periods_max); -_PA_DEFINE_FUNC(snd_pcm_hw_params_set_period_size); -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_period_size_min); -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_period_size_max); -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_buffer_size_max); -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_rate_min); -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_rate_max); -_PA_DEFINE_FUNC(snd_pcm_hw_params_get_rate_numden); -#define alsa_snd_pcm_hw_params_alloca(ptr) __alsa_snd_alloca(ptr, snd_pcm_hw_params) - -_PA_DEFINE_FUNC(snd_pcm_sw_params_sizeof); -_PA_DEFINE_FUNC(snd_pcm_sw_params_malloc); -_PA_DEFINE_FUNC(snd_pcm_sw_params_current); -_PA_DEFINE_FUNC(snd_pcm_sw_params_set_avail_min); -_PA_DEFINE_FUNC(snd_pcm_sw_params); -_PA_DEFINE_FUNC(snd_pcm_sw_params_free); -_PA_DEFINE_FUNC(snd_pcm_sw_params_set_start_threshold); -_PA_DEFINE_FUNC(snd_pcm_sw_params_set_stop_threshold); -_PA_DEFINE_FUNC(snd_pcm_sw_params_get_boundary); -_PA_DEFINE_FUNC(snd_pcm_sw_params_set_silence_threshold); -_PA_DEFINE_FUNC(snd_pcm_sw_params_set_silence_size); -_PA_DEFINE_FUNC(snd_pcm_sw_params_set_xfer_align); -_PA_DEFINE_FUNC(snd_pcm_sw_params_set_tstamp_mode); -#define alsa_snd_pcm_sw_params_alloca(ptr) __alsa_snd_alloca(ptr, snd_pcm_sw_params) - -_PA_DEFINE_FUNC(snd_pcm_info); -_PA_DEFINE_FUNC(snd_pcm_info_sizeof); -_PA_DEFINE_FUNC(snd_pcm_info_malloc); -_PA_DEFINE_FUNC(snd_pcm_info_free); -_PA_DEFINE_FUNC(snd_pcm_info_set_device); -_PA_DEFINE_FUNC(snd_pcm_info_set_subdevice); -_PA_DEFINE_FUNC(snd_pcm_info_set_stream); -_PA_DEFINE_FUNC(snd_pcm_info_get_name); -_PA_DEFINE_FUNC(snd_pcm_info_get_card); -#define alsa_snd_pcm_info_alloca(ptr) __alsa_snd_alloca(ptr, snd_pcm_info) - -_PA_DEFINE_FUNC(snd_ctl_pcm_next_device); -_PA_DEFINE_FUNC(snd_ctl_pcm_info); -_PA_DEFINE_FUNC(snd_ctl_open); -_PA_DEFINE_FUNC(snd_ctl_close); -_PA_DEFINE_FUNC(snd_ctl_card_info_malloc); -_PA_DEFINE_FUNC(snd_ctl_card_info_free); -_PA_DEFINE_FUNC(snd_ctl_card_info); -_PA_DEFINE_FUNC(snd_ctl_card_info_sizeof); -_PA_DEFINE_FUNC(snd_ctl_card_info_get_name); -#define alsa_snd_ctl_card_info_alloca(ptr) __alsa_snd_alloca(ptr, snd_ctl_card_info) - -_PA_DEFINE_FUNC(snd_config); -_PA_DEFINE_FUNC(snd_config_update); -_PA_DEFINE_FUNC(snd_config_search); -_PA_DEFINE_FUNC(snd_config_iterator_entry); -_PA_DEFINE_FUNC(snd_config_iterator_first); -_PA_DEFINE_FUNC(snd_config_iterator_end); -_PA_DEFINE_FUNC(snd_config_iterator_next); -_PA_DEFINE_FUNC(snd_config_get_string); -_PA_DEFINE_FUNC(snd_config_get_id); -_PA_DEFINE_FUNC(snd_config_update_free_global); - -_PA_DEFINE_FUNC(snd_pcm_status); -_PA_DEFINE_FUNC(snd_pcm_status_sizeof); -_PA_DEFINE_FUNC(snd_pcm_status_get_tstamp); -_PA_DEFINE_FUNC(snd_pcm_status_get_state); -_PA_DEFINE_FUNC(snd_pcm_status_get_trigger_tstamp); -_PA_DEFINE_FUNC(snd_pcm_status_get_delay); -#define alsa_snd_pcm_status_alloca(ptr) __alsa_snd_alloca(ptr, snd_pcm_status) - -_PA_DEFINE_FUNC(snd_card_next); -_PA_DEFINE_FUNC(snd_asoundlib_version); -_PA_DEFINE_FUNC(snd_strerror); -_PA_DEFINE_FUNC(snd_output_stdio_attach); - -#define alsa_snd_config_for_each(pos, next, node)\ - for (pos = alsa_snd_config_iterator_first(node),\ - next = alsa_snd_config_iterator_next(pos);\ - pos != alsa_snd_config_iterator_end(node); pos = next, next = alsa_snd_config_iterator_next(pos)) - -#undef _PA_DEFINE_FUNC - -/* Redefine 'PA_ALSA_PATHNAME' to a different Alsa library name if desired. */ -#ifndef PA_ALSA_PATHNAME - #define PA_ALSA_PATHNAME "libasound.so" -#endif -static const char *g_AlsaLibName = PA_ALSA_PATHNAME; - -/* Handle to dynamically loaded library. */ -static void *g_AlsaLib = NULL; - -#ifdef PA_ALSA_DYNAMIC - -#define _PA_LOCAL_IMPL(x) __pa_local_##x - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_set_rate_near) (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir) -{ - int ret; - - if(( ret = alsa_snd_pcm_hw_params_set_rate(pcm, params, (*val), (*dir)) ) < 0 ) - return ret; - - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_set_buffer_size_near) (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val) -{ - int ret; - - if(( ret = alsa_snd_pcm_hw_params_set_buffer_size(pcm, params, (*val)) ) < 0 ) - return ret; - - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_set_period_size_near) (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir) -{ - int ret; - - if(( ret = alsa_snd_pcm_hw_params_set_period_size(pcm, params, (*val), (*dir)) ) < 0 ) - return ret; - - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_get_channels_min) (const snd_pcm_hw_params_t *params, unsigned int *val) -{ - (*val) = 1; - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_get_channels_max) (const snd_pcm_hw_params_t *params, unsigned int *val) -{ - (*val) = 2; - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_get_periods_min) (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir) -{ - (*val) = 2; - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_get_periods_max) (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir) -{ - (*val) = 8; - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_get_period_size_min) (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir) -{ - (*frames) = 64; - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_get_period_size_max) (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir) -{ - (*frames) = 512; - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_get_buffer_size_max) (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val) -{ - int ret; - int dir = 0; - snd_pcm_uframes_t pmax = 0; - unsigned int pcnt = 0; - - dir = 0; - if(( ret = _PA_LOCAL_IMPL(snd_pcm_hw_params_get_period_size_max)(params, &pmax, &dir) ) < 0 ) - return ret; - dir = 0; - if(( ret = _PA_LOCAL_IMPL(snd_pcm_hw_params_get_periods_max)(params, &pcnt, &dir) ) < 0 ) - return ret; - - (*val) = pmax * pcnt; - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_get_rate_min) (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir) -{ - (*val) = 44100; - return 0; -} - -int _PA_LOCAL_IMPL(snd_pcm_hw_params_get_rate_max) (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir) -{ - (*val) = 44100; - return 0; -} - -#endif // PA_ALSA_DYNAMIC - -/* Trying to load Alsa library dynamically if 'PA_ALSA_DYNAMIC' is defined, othervise - will link during compilation. -*/ -static int PaAlsa_LoadLibrary() -{ -#ifdef PA_ALSA_DYNAMIC - - PA_DEBUG(( "%s: loading ALSA library file - %s\n", __FUNCTION__, g_AlsaLibName )); - - dlerror(); - g_AlsaLib = dlopen(g_AlsaLibName, (RTLD_NOW|RTLD_GLOBAL) ); - if (g_AlsaLib == NULL) - { - PA_DEBUG(( "%s: failed dlopen() ALSA library file - %s, error: %s\n", __FUNCTION__, g_AlsaLibName, dlerror() )); - return 0; - } - - PA_DEBUG(( "%s: loading ALSA API\n", __FUNCTION__ )); - - #define _PA_LOAD_FUNC(x) do { \ - alsa_##x = dlsym( g_AlsaLib, #x ); \ - if( alsa_##x == NULL ) { \ - PA_DEBUG(( "%s: symbol [%s] not found in - %s, error: %s\n", __FUNCTION__, #x, g_AlsaLibName, dlerror() )); }\ - } while(0) - -#else - - #define _PA_LOAD_FUNC(x) alsa_##x = &x - -#endif - - _PA_LOAD_FUNC(snd_pcm_open); - _PA_LOAD_FUNC(snd_pcm_close); - _PA_LOAD_FUNC(snd_pcm_nonblock); - _PA_LOAD_FUNC(snd_pcm_frames_to_bytes); - _PA_LOAD_FUNC(snd_pcm_prepare); - _PA_LOAD_FUNC(snd_pcm_start); - _PA_LOAD_FUNC(snd_pcm_resume); - _PA_LOAD_FUNC(snd_pcm_wait); - _PA_LOAD_FUNC(snd_pcm_state); - _PA_LOAD_FUNC(snd_pcm_avail_update); - _PA_LOAD_FUNC(snd_pcm_areas_silence); - _PA_LOAD_FUNC(snd_pcm_mmap_begin); - _PA_LOAD_FUNC(snd_pcm_mmap_commit); - _PA_LOAD_FUNC(snd_pcm_readi); - _PA_LOAD_FUNC(snd_pcm_readn); - _PA_LOAD_FUNC(snd_pcm_writei); - _PA_LOAD_FUNC(snd_pcm_writen); - _PA_LOAD_FUNC(snd_pcm_drain); - _PA_LOAD_FUNC(snd_pcm_recover); - _PA_LOAD_FUNC(snd_pcm_drop); - _PA_LOAD_FUNC(snd_pcm_area_copy); - _PA_LOAD_FUNC(snd_pcm_poll_descriptors); - _PA_LOAD_FUNC(snd_pcm_poll_descriptors_count); - _PA_LOAD_FUNC(snd_pcm_poll_descriptors_revents); - _PA_LOAD_FUNC(snd_pcm_format_size); - _PA_LOAD_FUNC(snd_pcm_link); - _PA_LOAD_FUNC(snd_pcm_delay); - - _PA_LOAD_FUNC(snd_pcm_hw_params_sizeof); - _PA_LOAD_FUNC(snd_pcm_hw_params_malloc); - _PA_LOAD_FUNC(snd_pcm_hw_params_free); - _PA_LOAD_FUNC(snd_pcm_hw_params_any); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_access); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_format); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_channels); -// _PA_LOAD_FUNC(snd_pcm_hw_params_set_periods_near); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_rate_near); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_rate); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_rate_resample); -// _PA_LOAD_FUNC(snd_pcm_hw_params_set_buffer_time_near); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_buffer_size); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_near); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_min); -// _PA_LOAD_FUNC(snd_pcm_hw_params_set_period_time_near); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_period_size_near); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_periods_integer); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_periods_min); - - _PA_LOAD_FUNC(snd_pcm_hw_params_get_buffer_size); -// _PA_LOAD_FUNC(snd_pcm_hw_params_get_period_size); -// _PA_LOAD_FUNC(snd_pcm_hw_params_get_access); -// _PA_LOAD_FUNC(snd_pcm_hw_params_get_periods); -// _PA_LOAD_FUNC(snd_pcm_hw_params_get_rate); - _PA_LOAD_FUNC(snd_pcm_hw_params_get_channels_min); - _PA_LOAD_FUNC(snd_pcm_hw_params_get_channels_max); - - _PA_LOAD_FUNC(snd_pcm_hw_params_test_period_size); - _PA_LOAD_FUNC(snd_pcm_hw_params_test_format); - _PA_LOAD_FUNC(snd_pcm_hw_params_test_access); - _PA_LOAD_FUNC(snd_pcm_hw_params_dump); - _PA_LOAD_FUNC(snd_pcm_hw_params); - - _PA_LOAD_FUNC(snd_pcm_hw_params_get_periods_min); - _PA_LOAD_FUNC(snd_pcm_hw_params_get_periods_max); - _PA_LOAD_FUNC(snd_pcm_hw_params_set_period_size); - _PA_LOAD_FUNC(snd_pcm_hw_params_get_period_size_min); - _PA_LOAD_FUNC(snd_pcm_hw_params_get_period_size_max); - _PA_LOAD_FUNC(snd_pcm_hw_params_get_buffer_size_max); - _PA_LOAD_FUNC(snd_pcm_hw_params_get_rate_min); - _PA_LOAD_FUNC(snd_pcm_hw_params_get_rate_max); - _PA_LOAD_FUNC(snd_pcm_hw_params_get_rate_numden); - - _PA_LOAD_FUNC(snd_pcm_sw_params_sizeof); - _PA_LOAD_FUNC(snd_pcm_sw_params_malloc); - _PA_LOAD_FUNC(snd_pcm_sw_params_current); - _PA_LOAD_FUNC(snd_pcm_sw_params_set_avail_min); - _PA_LOAD_FUNC(snd_pcm_sw_params); - _PA_LOAD_FUNC(snd_pcm_sw_params_free); - _PA_LOAD_FUNC(snd_pcm_sw_params_set_start_threshold); - _PA_LOAD_FUNC(snd_pcm_sw_params_set_stop_threshold); - _PA_LOAD_FUNC(snd_pcm_sw_params_get_boundary); - _PA_LOAD_FUNC(snd_pcm_sw_params_set_silence_threshold); - _PA_LOAD_FUNC(snd_pcm_sw_params_set_silence_size); - _PA_LOAD_FUNC(snd_pcm_sw_params_set_xfer_align); - _PA_LOAD_FUNC(snd_pcm_sw_params_set_tstamp_mode); - - _PA_LOAD_FUNC(snd_pcm_info); - _PA_LOAD_FUNC(snd_pcm_info_sizeof); - _PA_LOAD_FUNC(snd_pcm_info_malloc); - _PA_LOAD_FUNC(snd_pcm_info_free); - _PA_LOAD_FUNC(snd_pcm_info_set_device); - _PA_LOAD_FUNC(snd_pcm_info_set_subdevice); - _PA_LOAD_FUNC(snd_pcm_info_set_stream); - _PA_LOAD_FUNC(snd_pcm_info_get_name); - _PA_LOAD_FUNC(snd_pcm_info_get_card); - - _PA_LOAD_FUNC(snd_ctl_pcm_next_device); - _PA_LOAD_FUNC(snd_ctl_pcm_info); - _PA_LOAD_FUNC(snd_ctl_open); - _PA_LOAD_FUNC(snd_ctl_close); - _PA_LOAD_FUNC(snd_ctl_card_info_malloc); - _PA_LOAD_FUNC(snd_ctl_card_info_free); - _PA_LOAD_FUNC(snd_ctl_card_info); - _PA_LOAD_FUNC(snd_ctl_card_info_sizeof); - _PA_LOAD_FUNC(snd_ctl_card_info_get_name); - - _PA_LOAD_FUNC(snd_config); - _PA_LOAD_FUNC(snd_config_update); - _PA_LOAD_FUNC(snd_config_search); - _PA_LOAD_FUNC(snd_config_iterator_entry); - _PA_LOAD_FUNC(snd_config_iterator_first); - _PA_LOAD_FUNC(snd_config_iterator_end); - _PA_LOAD_FUNC(snd_config_iterator_next); - _PA_LOAD_FUNC(snd_config_get_string); - _PA_LOAD_FUNC(snd_config_get_id); - _PA_LOAD_FUNC(snd_config_update_free_global); - - _PA_LOAD_FUNC(snd_pcm_status); - _PA_LOAD_FUNC(snd_pcm_status_sizeof); - _PA_LOAD_FUNC(snd_pcm_status_get_tstamp); - _PA_LOAD_FUNC(snd_pcm_status_get_state); - _PA_LOAD_FUNC(snd_pcm_status_get_trigger_tstamp); - _PA_LOAD_FUNC(snd_pcm_status_get_delay); - - _PA_LOAD_FUNC(snd_card_next); - _PA_LOAD_FUNC(snd_asoundlib_version); - _PA_LOAD_FUNC(snd_strerror); - _PA_LOAD_FUNC(snd_output_stdio_attach); -#undef _PA_LOAD_FUNC - -#ifdef PA_ALSA_DYNAMIC - PA_DEBUG(( "%s: loaded ALSA API - ok\n", __FUNCTION__ )); - -#define _PA_VALIDATE_LOAD_REPLACEMENT(x)\ - do {\ - if( alsa_##x == NULL )\ - {\ - alsa_##x = &_PA_LOCAL_IMPL(x);\ - PA_DEBUG(( "%s: replacing [%s] with local implementation\n", __FUNCTION__, #x ));\ - }\ - } while (0) - - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_set_rate_near); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_set_buffer_size_near); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_set_period_size_near); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_get_channels_min); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_get_channels_max); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_get_periods_min); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_get_periods_max); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_get_period_size_min); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_get_period_size_max); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_get_buffer_size_max); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_get_rate_min); - _PA_VALIDATE_LOAD_REPLACEMENT(snd_pcm_hw_params_get_rate_max); - -#undef _PA_LOCAL_IMPL -#undef _PA_VALIDATE_LOAD_REPLACEMENT - -#endif // PA_ALSA_DYNAMIC - - return 1; -} - -void PaAlsa_SetLibraryPathName( const char *pathName ) -{ -#ifdef PA_ALSA_DYNAMIC - g_AlsaLibName = pathName; -#else - (void)pathName; -#endif -} - -/* Close handle to Alsa library. */ -static void PaAlsa_CloseLibrary() -{ -#ifdef PA_ALSA_DYNAMIC - dlclose(g_AlsaLib); - g_AlsaLib = NULL; -#endif -} - -/* Check return value of ALSA function, and map it to PaError */ -#define ENSURE_(expr, code) \ - do { \ - int __pa_unsure_error_id;\ - if( UNLIKELY( (__pa_unsure_error_id = (expr)) < 0 ) ) \ - { \ - /* PaUtil_SetLastHostErrorInfo should only be used in the main thread */ \ - if( (code) == paUnanticipatedHostError && pthread_equal( pthread_self(), paUnixMainThread) ) \ - { \ - PaUtil_SetLastHostErrorInfo( paALSA, __pa_unsure_error_id, alsa_snd_strerror( __pa_unsure_error_id ) ); \ - } \ - PaUtil_DebugPrint( "Expression '" #expr "' failed in '" __FILE__ "', line: " STRINGIZE( __LINE__ ) "\n" ); \ - if( (code) == paUnanticipatedHostError ) \ - PA_DEBUG(( "Host error description: %s\n", alsa_snd_strerror( __pa_unsure_error_id ) )); \ - result = (code); \ - goto error; \ - } \ - } while (0) - -#define ASSERT_CALL_(expr, success) \ - do {\ - int __pa_assert_error_id;\ - __pa_assert_error_id = (expr);\ - assert( success == __pa_assert_error_id );\ - } while (0) - -static int numPeriods_ = 4; -static int busyRetries_ = 100; - -int PaAlsa_SetNumPeriods( int numPeriods ) -{ - numPeriods_ = numPeriods; - return paNoError; -} - -typedef enum -{ - StreamDirection_In, - StreamDirection_Out -} StreamDirection; - -typedef struct -{ - PaSampleFormat hostSampleFormat; - int numUserChannels, numHostChannels; - int userInterleaved, hostInterleaved; - int canMmap; - void *nonMmapBuffer; - unsigned int nonMmapBufferSize; - PaDeviceIndex device; /* Keep the device index */ - int deviceIsPlug; /* Distinguish plug types from direct 'hw:' devices */ - int useReventFix; /* Alsa older than 1.0.16, plug devices need a fix */ - - snd_pcm_t *pcm; - snd_pcm_uframes_t framesPerPeriod, alsaBufferSize; - snd_pcm_format_t nativeFormat; - unsigned int nfds; - int ready; /* Marked ready from poll */ - void **userBuffers; - snd_pcm_uframes_t offset; - StreamDirection streamDir; - - snd_pcm_channel_area_t *channelAreas; /* Needed for channel adaption */ -} PaAlsaStreamComponent; - -/* Implementation specific stream structure */ -typedef struct PaAlsaStream -{ - PaUtilStreamRepresentation streamRepresentation; - PaUtilCpuLoadMeasurer cpuLoadMeasurer; - PaUtilBufferProcessor bufferProcessor; - PaUnixThread thread; - - unsigned long framesPerUserBuffer, maxFramesPerHostBuffer; - - int primeBuffers; - int callbackMode; /* bool: are we running in callback mode? */ - int pcmsSynced; /* Have we successfully synced pcms */ - int rtSched; - - /* the callback thread uses these to poll the sound device(s), waiting - * for data to be ready/available */ - struct pollfd* pfds; - int pollTimeout; - - /* Used in communication between threads */ - volatile sig_atomic_t callback_finished; /* bool: are we in the "callback finished" state? */ - volatile sig_atomic_t callbackAbort; /* Drop frames? */ - volatile sig_atomic_t isActive; /* Is stream in active state? (Between StartStream and StopStream || !paContinue) */ - PaUnixMutex stateMtx; /* Used to synchronize access to stream state */ - - int neverDropInput; - - PaTime underrun; - PaTime overrun; - - PaAlsaStreamComponent capture, playback; -} -PaAlsaStream; - -/* PaAlsaHostApiRepresentation - host api datastructure specific to this implementation */ - -typedef struct PaAlsaHostApiRepresentation -{ - PaUtilHostApiRepresentation baseHostApiRep; - PaUtilStreamInterface callbackStreamInterface; - PaUtilStreamInterface blockingStreamInterface; - - PaUtilAllocationGroup *allocations; - - PaHostApiIndex hostApiIndex; - PaUint32 alsaLibVersion; /* Retrieved from the library at run-time */ -} -PaAlsaHostApiRepresentation; - -typedef struct PaAlsaDeviceInfo -{ - PaDeviceInfo baseDeviceInfo; - char *alsaName; - int isPlug; - int minInputChannels; - int minOutputChannels; -} -PaAlsaDeviceInfo; - -/* prototypes for functions declared in this file */ - -static void Terminate( struct PaUtilHostApiRepresentation *hostApi ); -static PaError IsFormatSupported( struct PaUtilHostApiRepresentation *hostApi, - const PaStreamParameters *inputParameters, - const PaStreamParameters *outputParameters, - double sampleRate ); -static PaError OpenStream( struct PaUtilHostApiRepresentation *hostApi, - PaStream** s, - const PaStreamParameters *inputParameters, - const PaStreamParameters *outputParameters, - double sampleRate, - unsigned long framesPerBuffer, - PaStreamFlags streamFlags, - PaStreamCallback *callback, - void *userData ); -static PaError CloseStream( PaStream* stream ); -static PaError StartStream( PaStream *stream ); -static PaError StopStream( PaStream *stream ); -static PaError AbortStream( PaStream *stream ); -static PaError IsStreamStopped( PaStream *s ); -static PaError IsStreamActive( PaStream *stream ); -static PaTime GetStreamTime( PaStream *stream ); -static double GetStreamCpuLoad( PaStream* stream ); -static PaError BuildDeviceList( PaAlsaHostApiRepresentation *hostApi ); -static int SetApproximateSampleRate( snd_pcm_t *pcm, snd_pcm_hw_params_t *hwParams, double sampleRate ); -static int GetExactSampleRate( snd_pcm_hw_params_t *hwParams, double *sampleRate ); -static PaUint32 PaAlsaVersionNum(void); - -/* Callback prototypes */ -static void *CallbackThreadFunc( void *userData ); - -/* Blocking prototypes */ -static signed long GetStreamReadAvailable( PaStream* s ); -static signed long GetStreamWriteAvailable( PaStream* s ); -static PaError ReadStream( PaStream* stream, void *buffer, unsigned long frames ); -static PaError WriteStream( PaStream* stream, const void *buffer, unsigned long frames ); - - -static const PaAlsaDeviceInfo *GetDeviceInfo( const PaUtilHostApiRepresentation *hostApi, int device ) -{ - return (const PaAlsaDeviceInfo *)hostApi->deviceInfos[device]; -} - -/** Uncommented because AlsaErrorHandler is unused for anything good yet. If AlsaErrorHandler is - to be used, do not forget to register this callback in PaAlsa_Initialize, and unregister in Terminate. -*/ -/*static void AlsaErrorHandler(const char *file, int line, const char *function, int err, const char *fmt, ...) -{ -}*/ - -PaError PaAlsa_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiIndex hostApiIndex ) -{ - PaError result = paNoError; - PaAlsaHostApiRepresentation *alsaHostApi = NULL; - - /* Try loading Alsa library. */ - if (!PaAlsa_LoadLibrary()) - return paHostApiNotFound; - - PA_UNLESS( alsaHostApi = (PaAlsaHostApiRepresentation*) PaUtil_AllocateMemory( - sizeof(PaAlsaHostApiRepresentation) ), paInsufficientMemory ); - PA_UNLESS( alsaHostApi->allocations = PaUtil_CreateAllocationGroup(), paInsufficientMemory ); - alsaHostApi->hostApiIndex = hostApiIndex; - alsaHostApi->alsaLibVersion = PaAlsaVersionNum(); - - *hostApi = (PaUtilHostApiRepresentation*)alsaHostApi; - (*hostApi)->info.structVersion = 1; - (*hostApi)->info.type = paALSA; - (*hostApi)->info.name = "ALSA"; - - (*hostApi)->Terminate = Terminate; - (*hostApi)->OpenStream = OpenStream; - (*hostApi)->IsFormatSupported = IsFormatSupported; - - /** If AlsaErrorHandler is to be used, do not forget to unregister callback pointer in - Terminate function. - */ - /*ENSURE_( snd_lib_error_set_handler(AlsaErrorHandler), paUnanticipatedHostError );*/ - - PA_ENSURE( BuildDeviceList( alsaHostApi ) ); - - PaUtil_InitializeStreamInterface( &alsaHostApi->callbackStreamInterface, - CloseStream, StartStream, - StopStream, AbortStream, - IsStreamStopped, IsStreamActive, - GetStreamTime, GetStreamCpuLoad, - PaUtil_DummyRead, PaUtil_DummyWrite, - PaUtil_DummyGetReadAvailable, - PaUtil_DummyGetWriteAvailable ); - - PaUtil_InitializeStreamInterface( &alsaHostApi->blockingStreamInterface, - CloseStream, StartStream, - StopStream, AbortStream, - IsStreamStopped, IsStreamActive, - GetStreamTime, PaUtil_DummyGetCpuLoad, - ReadStream, WriteStream, - GetStreamReadAvailable, - GetStreamWriteAvailable ); - - PA_ENSURE( PaUnixThreading_Initialize() ); - - return result; - -error: - if( alsaHostApi ) - { - if( alsaHostApi->allocations ) - { - PaUtil_FreeAllAllocations( alsaHostApi->allocations ); - PaUtil_DestroyAllocationGroup( alsaHostApi->allocations ); - } - - PaUtil_FreeMemory( alsaHostApi ); - } - - return result; -} - -static void Terminate( struct PaUtilHostApiRepresentation *hostApi ) -{ - PaAlsaHostApiRepresentation *alsaHostApi = (PaAlsaHostApiRepresentation*)hostApi; - - assert( hostApi ); - - /** See AlsaErrorHandler and PaAlsa_Initialize for details. - */ - /*snd_lib_error_set_handler(NULL);*/ - - if( alsaHostApi->allocations ) - { - PaUtil_FreeAllAllocations( alsaHostApi->allocations ); - PaUtil_DestroyAllocationGroup( alsaHostApi->allocations ); - } - - PaUtil_FreeMemory( alsaHostApi ); - alsa_snd_config_update_free_global(); - - /* Close Alsa library. */ - PaAlsa_CloseLibrary(); -} - -/** Determine max channels and default latencies. - * - * This function provides functionality to grope an opened (might be opened for capture or playback) pcm device for - * traits like max channels, suitable default latencies and default sample rate. Upon error, max channels is set to zero, - * and a suitable result returned. The device is closed before returning. - */ -static PaError GropeDevice( snd_pcm_t* pcm, int isPlug, StreamDirection mode, int openBlocking, - PaAlsaDeviceInfo* devInfo ) -{ - PaError result = paNoError; - snd_pcm_hw_params_t *hwParams; - snd_pcm_uframes_t alsaBufferFrames, alsaPeriodFrames; - unsigned int minChans, maxChans; - int* minChannels, * maxChannels; - double * defaultLowLatency, * defaultHighLatency, * defaultSampleRate = - &devInfo->baseDeviceInfo.defaultSampleRate; - double defaultSr = *defaultSampleRate; - - assert( pcm ); - - PA_DEBUG(( "%s: collecting info ..\n", __FUNCTION__ )); - - if( StreamDirection_In == mode ) - { - minChannels = &devInfo->minInputChannels; - maxChannels = &devInfo->baseDeviceInfo.maxInputChannels; - defaultLowLatency = &devInfo->baseDeviceInfo.defaultLowInputLatency; - defaultHighLatency = &devInfo->baseDeviceInfo.defaultHighInputLatency; - } - else - { - minChannels = &devInfo->minOutputChannels; - maxChannels = &devInfo->baseDeviceInfo.maxOutputChannels; - defaultLowLatency = &devInfo->baseDeviceInfo.defaultLowOutputLatency; - defaultHighLatency = &devInfo->baseDeviceInfo.defaultHighOutputLatency; - } - - ENSURE_( alsa_snd_pcm_nonblock( pcm, 0 ), paUnanticipatedHostError ); - - alsa_snd_pcm_hw_params_alloca( &hwParams ); - alsa_snd_pcm_hw_params_any( pcm, hwParams ); - - if( defaultSr >= 0 ) - { - /* Could be that the device opened in one mode supports samplerates that the other mode wont have, - * so try again .. */ - if( SetApproximateSampleRate( pcm, hwParams, defaultSr ) < 0 ) - { - defaultSr = -1.; - alsa_snd_pcm_hw_params_any( pcm, hwParams ); /* Clear any params (rate) that might have been set */ - PA_DEBUG(( "%s: Original default samplerate failed, trying again ..\n", __FUNCTION__ )); - } - } - - if( defaultSr < 0. ) /* Default sample rate not set */ - { - unsigned int sampleRate = 44100; /* Will contain approximate rate returned by alsa-lib */ - - /* Don't allow rate resampling when probing for the default rate (but ignore if this call fails) */ - alsa_snd_pcm_hw_params_set_rate_resample( pcm, hwParams, 0 ); - if( alsa_snd_pcm_hw_params_set_rate_near( pcm, hwParams, &sampleRate, NULL ) < 0 ) - { - result = paUnanticipatedHostError; - goto error; - } - ENSURE_( GetExactSampleRate( hwParams, &defaultSr ), paUnanticipatedHostError ); - } - - ENSURE_( alsa_snd_pcm_hw_params_get_channels_min( hwParams, &minChans ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_hw_params_get_channels_max( hwParams, &maxChans ), paUnanticipatedHostError ); - assert( maxChans <= INT_MAX ); - assert( maxChans > 0 ); /* Weird linking issue could cause wrong version of ALSA symbols to be called, - resulting in zeroed values */ - - /* XXX: Limit to sensible number (ALSA plugins accept a crazy amount of channels)? */ - if( isPlug && maxChans > 128 ) - { - maxChans = 128; - PA_DEBUG(( "%s: Limiting number of plugin channels to %u\n", __FUNCTION__, maxChans )); - } - - /* TWEAKME: - * Giving values for default min and max latency is not straightforward. - * * for low latency, we want to give the lowest value that will work reliably. - * This varies based on the sound card, kernel, CPU, etc. Better to give - * sub-optimal latency than to give a number too low and cause dropouts. - * * for high latency we want to give a large enough value that dropouts are basically impossible. - * This doesn't really require as much tweaking, since providing too large a number will - * just cause us to select the nearest setting that will work at stream config time. - */ - /* Try low latency values, (sometimes the buffer & period that result are larger) */ - alsaBufferFrames = 512; - alsaPeriodFrames = 128; - ENSURE_( alsa_snd_pcm_hw_params_set_buffer_size_near( pcm, hwParams, &alsaBufferFrames ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPeriodFrames, NULL ), paUnanticipatedHostError ); - *defaultLowLatency = (double) (alsaBufferFrames - alsaPeriodFrames) / defaultSr; - - /* Base the high latency case on values four times larger */ - alsaBufferFrames = 2048; - alsaPeriodFrames = 512; - /* Have to reset hwParams, to set new buffer size; need to also set sample rate again */ - ENSURE_( alsa_snd_pcm_hw_params_any( pcm, hwParams ), paUnanticipatedHostError ); - ENSURE_( SetApproximateSampleRate( pcm, hwParams, defaultSr ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_hw_params_set_buffer_size_near( pcm, hwParams, &alsaBufferFrames ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPeriodFrames, NULL ), paUnanticipatedHostError ); - *defaultHighLatency = (double) (alsaBufferFrames - alsaPeriodFrames) / defaultSr; - - *minChannels = (int)minChans; - *maxChannels = (int)maxChans; - *defaultSampleRate = defaultSr; - -end: - alsa_snd_pcm_close( pcm ); - return result; - -error: - goto end; -} - -/* Initialize device info with invalid values (maxInputChannels and maxOutputChannels are set to zero since these indicate - * whether input/output is available) */ -static void InitializeDeviceInfo( PaDeviceInfo *deviceInfo ) -{ - deviceInfo->structVersion = -1; - deviceInfo->name = NULL; - deviceInfo->hostApi = -1; - deviceInfo->maxInputChannels = 0; - deviceInfo->maxOutputChannels = 0; - deviceInfo->defaultLowInputLatency = -1.; - deviceInfo->defaultLowOutputLatency = -1.; - deviceInfo->defaultHighInputLatency = -1.; - deviceInfo->defaultHighOutputLatency = -1.; - deviceInfo->defaultSampleRate = -1.; -} - - -/* Retrieve the version of the runtime Alsa-lib, as a single number equivalent to - * SND_LIB_VERSION. Only a version string is available ("a.b.c") so this has to be converted. - * Assume 'a' and 'b' are single digits only. - */ -static PaUint32 PaAlsaVersionNum(void) -{ - char* verStr; - PaUint32 verNum; - - verStr = (char*) alsa_snd_asoundlib_version(); - verNum = ALSA_VERSION_INT( atoi(verStr), atoi(verStr + 2), atoi(verStr + 4) ); - PA_DEBUG(( "ALSA version (build): " SND_LIB_VERSION_STR "\nALSA version (runtime): %s\n", verStr )); - - return verNum; -} - - -/* Helper struct */ -typedef struct -{ - char *alsaName; - char *name; - int isPlug; - int hasPlayback; - int hasCapture; -} HwDevInfo; - - -HwDevInfo predefinedNames[] = { - { "center_lfe", NULL, 0, 1, 0 }, -/* { "default", NULL, 0, 1, 1 }, */ - { "dmix", NULL, 0, 1, 0 }, -/* { "dpl", NULL, 0, 1, 0 }, */ -/* { "dsnoop", NULL, 0, 0, 1 }, */ - { "front", NULL, 0, 1, 0 }, - { "iec958", NULL, 0, 1, 0 }, -/* { "modem", NULL, 0, 1, 0 }, */ - { "rear", NULL, 0, 1, 0 }, - { "side", NULL, 0, 1, 0 }, -/* { "spdif", NULL, 0, 0, 0 }, */ - { "surround40", NULL, 0, 1, 0 }, - { "surround41", NULL, 0, 1, 0 }, - { "surround50", NULL, 0, 1, 0 }, - { "surround51", NULL, 0, 1, 0 }, - { "surround71", NULL, 0, 1, 0 }, - - { "AndroidPlayback_Earpiece_normal", NULL, 0, 1, 0 }, - { "AndroidPlayback_Speaker_normal", NULL, 0, 1, 0 }, - { "AndroidPlayback_Bluetooth_normal", NULL, 0, 1, 0 }, - { "AndroidPlayback_Headset_normal", NULL, 0, 1, 0 }, - { "AndroidPlayback_Speaker_Headset_normal", NULL, 0, 1, 0 }, - { "AndroidPlayback_Bluetooth-A2DP_normal", NULL, 0, 1, 0 }, - { "AndroidPlayback_ExtraDockSpeaker_normal", NULL, 0, 1, 0 }, - { "AndroidPlayback_TvOut_normal", NULL, 0, 1, 0 }, - - { "AndroidRecord_Microphone", NULL, 0, 0, 1 }, - { "AndroidRecord_Earpiece_normal", NULL, 0, 0, 1 }, - { "AndroidRecord_Speaker_normal", NULL, 0, 0, 1 }, - { "AndroidRecord_Headset_normal", NULL, 0, 0, 1 }, - { "AndroidRecord_Bluetooth_normal", NULL, 0, 0, 1 }, - { "AndroidRecord_Speaker_Headset_normal", NULL, 0, 0, 1 }, - - { NULL, NULL, 0, 1, 0 } -}; - -static const HwDevInfo *FindDeviceName( const char *name ) -{ - int i; - - for( i = 0; predefinedNames[i].alsaName; i++ ) - { - if( strcmp( name, predefinedNames[i].alsaName ) == 0 ) - { - return &predefinedNames[i]; - } - } - - return NULL; -} - -static PaError PaAlsa_StrDup( PaAlsaHostApiRepresentation *alsaApi, - char **dst, - const char *src) -{ - PaError result = paNoError; - int len = strlen( src ) + 1; - - /* PA_DEBUG(("PaStrDup %s %d\n", src, len)); */ - - PA_UNLESS( *dst = (char *)PaUtil_GroupAllocateMemory( alsaApi->allocations, len ), - paInsufficientMemory ); - strncpy( *dst, src, len ); - -error: - return result; -} - -/* Disregard some standard plugins - */ -static int IgnorePlugin( const char *pluginId ) -{ - static const char *ignoredPlugins[] = {"hw", "plughw", "plug", "dsnoop", "tee", - "file", "null", "shm", "cards", "rate_convert", NULL}; - int i = 0; - - if( getenv( "PA_ALSA_IGNORE_ALL_PLUGINS" ) && atoi( getenv( "PA_ALSA_IGNORE_ALL_PLUGINS") ) ) - return 1; - - while( ignoredPlugins[i] ) - { - if( !strcmp( pluginId, ignoredPlugins[i] ) ) - { - return 1; - } - ++i; - } - - return 0; -} - -/* Skip past parts at the beginning of a (pcm) info name that are already in the card name, to avoid duplication */ -static char *SkipCardDetailsInName( char *infoSkipName, char *cardRefName ) -{ - char *lastSpacePosn = infoSkipName; - - /* Skip matching chars; but only in chunks separated by ' ' (not part words etc), so track lastSpacePosn */ - while( *cardRefName ) - { - while( *infoSkipName && *cardRefName && *infoSkipName == *cardRefName) - { - infoSkipName++; - cardRefName++; - if( *infoSkipName == ' ' || *infoSkipName == '\0' ) - lastSpacePosn = infoSkipName; - } - infoSkipName = lastSpacePosn; - /* Look for another chunk; post-increment means ends pointing to next char */ - while( *cardRefName && ( *cardRefName++ != ' ' )); - } - if( *infoSkipName == '\0' ) - return "-"; /* The 2 names were identical; instead of a nul-string, return a marker string */ - - /* Now want to move to the first char after any spaces */ - while( *lastSpacePosn && *lastSpacePosn == ' ' ) - lastSpacePosn++; - /* Skip a single separator char if present in the remaining pcm name; (pa will add its own) */ - if(( *lastSpacePosn == '-' || *lastSpacePosn == ':' ) && *(lastSpacePosn + 1) == ' ' ) - lastSpacePosn += 2; - - return lastSpacePosn; -} - -/** Open PCM device. - * - * Wrapper around alsa_snd_pcm_open which may repeatedly retry opening a device if it is busy, for - * a certain time. This is because dmix may temporarily hold on to a device after it (dmix) - * has been opened and closed. - * @param mode: Open mode (e.g., SND_PCM_BLOCKING). - * @param waitOnBusy: Retry opening busy device for up to one second? - **/ -static int OpenPcm( snd_pcm_t **pcmp, const char *name, snd_pcm_stream_t stream, int mode, int waitOnBusy ) -{ - int ret, tries = 0, maxTries = waitOnBusy ? busyRetries_ : 0; - - ret = alsa_snd_pcm_open( pcmp, name, stream, mode ); - - for( tries = 0; tries < maxTries && -EBUSY == ret; ++tries ) - { - Pa_Sleep( 10 ); - ret = alsa_snd_pcm_open( pcmp, name, stream, mode ); - if( -EBUSY != ret ) - { - PA_DEBUG(( "%s: Successfully opened initially busy device after %d tries\n", __FUNCTION__, tries )); - } - } - if( -EBUSY == ret ) - { - PA_DEBUG(( "%s: Failed to open busy device '%s'\n", __FUNCTION__, name )); - } - else - { - if( ret < 0 ) - PA_DEBUG(( "%s: Opened device '%s' ptr[%p] - result: [%d:%s]\n", __FUNCTION__, name, *pcmp, ret, alsa_snd_strerror(ret) )); - } - - return ret; -} - -static PaError FillInDevInfo( PaAlsaHostApiRepresentation *alsaApi, HwDevInfo* deviceHwInfo, int blocking, - PaAlsaDeviceInfo* devInfo, int* devIdx ) -{ - PaError result = 0; - PaDeviceInfo *baseDeviceInfo = &devInfo->baseDeviceInfo; - snd_pcm_t *pcm = NULL; - PaUtilHostApiRepresentation *baseApi = &alsaApi->baseHostApiRep; - - PA_DEBUG(( "%s: Filling device info for: %s\n", __FUNCTION__, deviceHwInfo->name )); - - /* Zero fields */ - InitializeDeviceInfo( baseDeviceInfo ); - - /* To determine device capabilities, we must open the device and query the - * hardware parameter configuration space */ - - /* Query capture */ - if( deviceHwInfo->hasCapture && - OpenPcm( &pcm, deviceHwInfo->alsaName, SND_PCM_STREAM_CAPTURE, blocking, 0 ) >= 0 ) - { - if( GropeDevice( pcm, deviceHwInfo->isPlug, StreamDirection_In, blocking, devInfo ) != paNoError ) - { - /* Error */ - PA_DEBUG(( "%s: Failed groping %s for capture\n", __FUNCTION__, deviceHwInfo->alsaName )); - goto end; - } - } - - /* Query playback */ - if( deviceHwInfo->hasPlayback && - OpenPcm( &pcm, deviceHwInfo->alsaName, SND_PCM_STREAM_PLAYBACK, blocking, 0 ) >= 0 ) - { - if( GropeDevice( pcm, deviceHwInfo->isPlug, StreamDirection_Out, blocking, devInfo ) != paNoError ) - { - /* Error */ - PA_DEBUG(( "%s: Failed groping %s for playback\n", __FUNCTION__, deviceHwInfo->alsaName )); - goto end; - } - } - - baseDeviceInfo->structVersion = 2; - baseDeviceInfo->hostApi = alsaApi->hostApiIndex; - baseDeviceInfo->name = deviceHwInfo->name; - devInfo->alsaName = deviceHwInfo->alsaName; - devInfo->isPlug = deviceHwInfo->isPlug; - - /* A: Storing pointer to PaAlsaDeviceInfo object as pointer to PaDeviceInfo object. - * Should now be safe to add device info, unless the device supports neither capture nor playback - */ - if( baseDeviceInfo->maxInputChannels > 0 || baseDeviceInfo->maxOutputChannels > 0 ) - { - /* Make device default if there isn't already one or it is the ALSA "default" device */ - if( ( baseApi->info.defaultInputDevice == paNoDevice || - !strcmp( deviceHwInfo->alsaName, "default" ) ) && baseDeviceInfo->maxInputChannels > 0 ) - { - baseApi->info.defaultInputDevice = *devIdx; - PA_DEBUG(( "Default input device: %s\n", deviceHwInfo->name )); - } - if( ( baseApi->info.defaultOutputDevice == paNoDevice || - !strcmp( deviceHwInfo->alsaName, "default" ) ) && baseDeviceInfo->maxOutputChannels > 0 ) - { - baseApi->info.defaultOutputDevice = *devIdx; - PA_DEBUG(( "Default output device: %s\n", deviceHwInfo->name )); - } - PA_DEBUG(( "%s: Adding device %s: %d\n", __FUNCTION__, deviceHwInfo->name, *devIdx )); - baseApi->deviceInfos[*devIdx] = (PaDeviceInfo *) devInfo; - (*devIdx) += 1; - } - else - { - PA_DEBUG(( "%s: Skipped device: %s, all channels == 0\n", __FUNCTION__, deviceHwInfo->name )); - } - -end: - return result; -} - -/* Build PaDeviceInfo list, ignore devices for which we cannot determine capabilities (possibly busy, sigh) */ -static PaError BuildDeviceList( PaAlsaHostApiRepresentation *alsaApi ) -{ - PaUtilHostApiRepresentation *baseApi = &alsaApi->baseHostApiRep; - PaAlsaDeviceInfo *deviceInfoArray; - int cardIdx = -1, devIdx = 0; - snd_ctl_card_info_t *cardInfo; - PaError result = paNoError; - size_t numDeviceNames = 0, maxDeviceNames = 1, i; - HwDevInfo *hwDevInfos = NULL; - snd_config_t *topNode = NULL; - snd_pcm_info_t *pcmInfo; - int res; - int blocking = SND_PCM_NONBLOCK; - int usePlughw = 0; - char *hwPrefix = ""; - char alsaCardName[50]; -#ifdef PA_ENABLE_DEBUG_OUTPUT - PaTime startTime = PaUtil_GetTime(); -#endif - - if( getenv( "PA_ALSA_INITIALIZE_BLOCK" ) && atoi( getenv( "PA_ALSA_INITIALIZE_BLOCK" ) ) ) - blocking = 0; - - /* If PA_ALSA_PLUGHW is 1 (non-zero), use the plughw: pcm throughout instead of hw: */ - if( getenv( "PA_ALSA_PLUGHW" ) && atoi( getenv( "PA_ALSA_PLUGHW" ) ) ) - { - usePlughw = 1; - hwPrefix = "plug"; - PA_DEBUG(( "%s: Using Plughw\n", __FUNCTION__ )); - } - - /* These two will be set to the first working input and output device, respectively */ - baseApi->info.defaultInputDevice = paNoDevice; - baseApi->info.defaultOutputDevice = paNoDevice; - - /* Gather info about hw devices - - * alsa_snd_card_next() modifies the integer passed to it to be: - * the index of the first card if the parameter is -1 - * the index of the next card if the parameter is the index of a card - * -1 if there are no more cards - * - * The function itself returns 0 if it succeeded. */ - cardIdx = -1; - alsa_snd_ctl_card_info_alloca( &cardInfo ); - alsa_snd_pcm_info_alloca( &pcmInfo ); - while( alsa_snd_card_next( &cardIdx ) == 0 && cardIdx >= 0 ) - { - char *cardName; - int devIdx = -1; - snd_ctl_t *ctl; - char buf[50]; - - snprintf( alsaCardName, sizeof (alsaCardName), "hw:%d", cardIdx ); - - /* Acquire name of card */ - if( alsa_snd_ctl_open( &ctl, alsaCardName, 0 ) < 0 ) - { - /* Unable to open card :( */ - PA_DEBUG(( "%s: Unable to open device %s\n", __FUNCTION__, alsaCardName )); - continue; - } - alsa_snd_ctl_card_info( ctl, cardInfo ); - - PA_ENSURE( PaAlsa_StrDup( alsaApi, &cardName, alsa_snd_ctl_card_info_get_name( cardInfo )) ); - - while( alsa_snd_ctl_pcm_next_device( ctl, &devIdx ) == 0 && devIdx >= 0 ) - { - char *alsaDeviceName, *deviceName, *infoName; - size_t len; - int hasPlayback = 0, hasCapture = 0; - - snprintf( buf, sizeof (buf), "%s%s,%d", hwPrefix, alsaCardName, devIdx ); - - /* Obtain info about this particular device */ - alsa_snd_pcm_info_set_device( pcmInfo, devIdx ); - alsa_snd_pcm_info_set_subdevice( pcmInfo, 0 ); - alsa_snd_pcm_info_set_stream( pcmInfo, SND_PCM_STREAM_CAPTURE ); - if( alsa_snd_ctl_pcm_info( ctl, pcmInfo ) >= 0 ) - { - hasCapture = 1; - } - - alsa_snd_pcm_info_set_stream( pcmInfo, SND_PCM_STREAM_PLAYBACK ); - if( alsa_snd_ctl_pcm_info( ctl, pcmInfo ) >= 0 ) - { - hasPlayback = 1; - } - - if( !hasPlayback && !hasCapture ) - { - /* Error */ - continue; - } - - infoName = SkipCardDetailsInName( (char *)alsa_snd_pcm_info_get_name( pcmInfo ), cardName ); - - /* The length of the string written by snprintf plus terminating 0 */ - len = snprintf( NULL, 0, "%s: %s (%s)", cardName, infoName, buf ) + 1; - PA_UNLESS( deviceName = (char *)PaUtil_GroupAllocateMemory( alsaApi->allocations, len ), - paInsufficientMemory ); - snprintf( deviceName, len, "%s: %s (%s)", cardName, infoName, buf ); - - PA_DEBUG(( "%s: Found device [%d]: %s\n", __FUNCTION__, numDeviceNames, deviceName )); - - ++numDeviceNames; - if( !hwDevInfos || numDeviceNames > maxDeviceNames ) - { - maxDeviceNames *= 2; - PA_UNLESS( hwDevInfos = (HwDevInfo *) realloc( hwDevInfos, maxDeviceNames * sizeof (HwDevInfo) ), - paInsufficientMemory ); - } - - PA_ENSURE( PaAlsa_StrDup( alsaApi, &alsaDeviceName, buf ) ); - - hwDevInfos[ numDeviceNames - 1 ].alsaName = alsaDeviceName; - hwDevInfos[ numDeviceNames - 1 ].name = deviceName; - hwDevInfos[ numDeviceNames - 1 ].isPlug = usePlughw; - hwDevInfos[ numDeviceNames - 1 ].hasPlayback = hasPlayback; - hwDevInfos[ numDeviceNames - 1 ].hasCapture = hasCapture; - } - alsa_snd_ctl_close( ctl ); - } - - /* Iterate over plugin devices */ - if( NULL == (*alsa_snd_config) ) - { - /* alsa_snd_config_update is called implicitly by some functions, if this hasn't happened snd_config will be NULL (bleh) */ - ENSURE_( alsa_snd_config_update(), paUnanticipatedHostError ); - PA_DEBUG(( "Updating snd_config\n" )); - } - assert( *alsa_snd_config ); - if( ( res = alsa_snd_config_search( *alsa_snd_config, "pcm", &topNode ) ) >= 0 ) - { - snd_config_iterator_t i, next; - - alsa_snd_config_for_each( i, next, topNode ) - { - const char *tpStr = "unknown", *idStr = NULL; - int err = 0; - - char *alsaDeviceName, *deviceName; - const HwDevInfo *predefined = NULL; - snd_config_t *n = alsa_snd_config_iterator_entry( i ), * tp = NULL;; - - if( (err = alsa_snd_config_search( n, "type", &tp )) < 0 ) - { - if( -ENOENT != err ) - { - ENSURE_(err, paUnanticipatedHostError); - } - } - else - { - ENSURE_( alsa_snd_config_get_string( tp, &tpStr ), paUnanticipatedHostError ); - } - ENSURE_( alsa_snd_config_get_id( n, &idStr ), paUnanticipatedHostError ); - if( IgnorePlugin( idStr ) ) - { - PA_DEBUG(( "%s: Ignoring ALSA plugin device [%s] of type [%s]\n", __FUNCTION__, idStr, tpStr )); - continue; - } - PA_DEBUG(( "%s: Found plugin [%s] of type [%s]\n", __FUNCTION__, idStr, tpStr )); - - PA_UNLESS( alsaDeviceName = (char*)PaUtil_GroupAllocateMemory( alsaApi->allocations, - strlen(idStr) + 6 ), paInsufficientMemory ); - strcpy( alsaDeviceName, idStr ); - PA_UNLESS( deviceName = (char*)PaUtil_GroupAllocateMemory( alsaApi->allocations, - strlen(idStr) + 1 ), paInsufficientMemory ); - strcpy( deviceName, idStr ); - - ++numDeviceNames; - if( !hwDevInfos || numDeviceNames > maxDeviceNames ) - { - maxDeviceNames *= 2; - PA_UNLESS( hwDevInfos = (HwDevInfo *) realloc( hwDevInfos, maxDeviceNames * sizeof (HwDevInfo) ), - paInsufficientMemory ); - } - - predefined = FindDeviceName( alsaDeviceName ); - - hwDevInfos[numDeviceNames - 1].alsaName = alsaDeviceName; - hwDevInfos[numDeviceNames - 1].name = deviceName; - hwDevInfos[numDeviceNames - 1].isPlug = 1; - - if( predefined ) - { - hwDevInfos[numDeviceNames - 1].hasPlayback = predefined->hasPlayback; - hwDevInfos[numDeviceNames - 1].hasCapture = predefined->hasCapture; - } - else - { - hwDevInfos[numDeviceNames - 1].hasPlayback = 1; - hwDevInfos[numDeviceNames - 1].hasCapture = 1; - } - } - } - else - PA_DEBUG(( "%s: Iterating over ALSA plugins failed: %s\n", __FUNCTION__, alsa_snd_strerror( res ) )); - - /* allocate deviceInfo memory based on the number of devices */ - PA_UNLESS( baseApi->deviceInfos = (PaDeviceInfo**)PaUtil_GroupAllocateMemory( - alsaApi->allocations, sizeof(PaDeviceInfo*) * (numDeviceNames) ), paInsufficientMemory ); - - /* allocate all device info structs in a contiguous block */ - PA_UNLESS( deviceInfoArray = (PaAlsaDeviceInfo*)PaUtil_GroupAllocateMemory( - alsaApi->allocations, sizeof(PaAlsaDeviceInfo) * numDeviceNames ), paInsufficientMemory ); - - /* Loop over list of cards, filling in info. If a device is deemed unavailable (can't get name), - * it's ignored. - * - * Note that we do this in two stages. This is a workaround owing to the fact that the 'dmix' - * plugin may cause the underlying hardware device to be busy for a short while even after it - * (dmix) is closed. The 'default' plugin may also point to the dmix plugin, so the same goes - * for this. - */ - PA_DEBUG(( "%s: Filling device info for %d devices\n", __FUNCTION__, numDeviceNames )); - for( i = 0, devIdx = 0; i < numDeviceNames; ++i ) - { - PaAlsaDeviceInfo* devInfo = &deviceInfoArray[i]; - HwDevInfo* hwInfo = &hwDevInfos[i]; - if( !strcmp( hwInfo->name, "dmix" ) || !strcmp( hwInfo->name, "default" ) ) - { - continue; - } - - PA_ENSURE( FillInDevInfo( alsaApi, hwInfo, blocking, devInfo, &devIdx ) ); - } - assert( devIdx <= numDeviceNames ); - /* Now inspect 'dmix' and 'default' plugins */ - for( i = 0; i < numDeviceNames; ++i ) - { - PaAlsaDeviceInfo* devInfo = &deviceInfoArray[i]; - HwDevInfo* hwInfo = &hwDevInfos[i]; - if( strcmp( hwInfo->name, "dmix" ) && strcmp( hwInfo->name, "default" ) ) - { - continue; - } - - PA_ENSURE( FillInDevInfo( alsaApi, hwInfo, blocking, devInfo, &devIdx ) ); - } - free( hwDevInfos ); - - baseApi->info.deviceCount = devIdx; /* Number of successfully queried devices */ - -#ifdef PA_ENABLE_DEBUG_OUTPUT - PA_DEBUG(( "%s: Building device list took %f seconds\n", __FUNCTION__, PaUtil_GetTime() - startTime )); -#endif - -end: - return result; - -error: - /* No particular action */ - goto end; -} - -/* Check against known device capabilities */ -static PaError ValidateParameters( const PaStreamParameters *parameters, PaUtilHostApiRepresentation *hostApi, StreamDirection mode ) -{ - PaError result = paNoError; - int maxChans; - const PaAlsaDeviceInfo *deviceInfo = NULL; - assert( parameters ); - - if( parameters->device != paUseHostApiSpecificDeviceSpecification ) - { - assert( parameters->device < hostApi->info.deviceCount ); - PA_UNLESS( parameters->hostApiSpecificStreamInfo == NULL, paBadIODeviceCombination ); - deviceInfo = GetDeviceInfo( hostApi, parameters->device ); - } - else - { - const PaAlsaStreamInfo *streamInfo = parameters->hostApiSpecificStreamInfo; - - PA_UNLESS( parameters->device == paUseHostApiSpecificDeviceSpecification, paInvalidDevice ); - PA_UNLESS( streamInfo->size == sizeof (PaAlsaStreamInfo) && streamInfo->version == 1, - paIncompatibleHostApiSpecificStreamInfo ); - PA_UNLESS( streamInfo->deviceString != NULL, paInvalidDevice ); - - /* Skip further checking */ - return paNoError; - } - - assert( deviceInfo ); - assert( parameters->hostApiSpecificStreamInfo == NULL ); - maxChans = ( StreamDirection_In == mode ? deviceInfo->baseDeviceInfo.maxInputChannels : - deviceInfo->baseDeviceInfo.maxOutputChannels ); - PA_UNLESS( parameters->channelCount <= maxChans, paInvalidChannelCount ); - -error: - return result; -} - -/* Given an open stream, what sample formats are available? */ -static PaSampleFormat GetAvailableFormats( snd_pcm_t *pcm ) -{ - PaSampleFormat available = 0; - snd_pcm_hw_params_t *hwParams; - alsa_snd_pcm_hw_params_alloca( &hwParams ); - - alsa_snd_pcm_hw_params_any( pcm, hwParams ); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_FLOAT ) >= 0) - available |= paFloat32; - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S32 ) >= 0) - available |= paInt32; - -#ifdef PA_LITTLE_ENDIAN - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S24_3LE ) >= 0) - available |= paInt24; -#elif defined PA_BIG_ENDIAN - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S24_3BE ) >= 0) - available |= paInt24; -#endif - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S16 ) >= 0) - available |= paInt16; - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U8 ) >= 0) - available |= paUInt8; - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S8 ) >= 0) - available |= paInt8; - - return available; -} - -/* Output to console all formats supported by device */ -static void LogAllAvailableFormats( snd_pcm_t *pcm ) -{ - PaSampleFormat available = 0; - snd_pcm_hw_params_t *hwParams; - alsa_snd_pcm_hw_params_alloca( &hwParams ); - - alsa_snd_pcm_hw_params_any( pcm, hwParams ); - - PA_DEBUG(( " --- Supported Formats ---\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S8 ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S8\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U8 ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U8\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S16_LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S16_LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S16_BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S16_BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U16_LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U16_LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U16_BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U16_BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S24_LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S24_LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S24_BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S24_BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U24_LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U24_LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U24_BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U24_BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_FLOAT_LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_FLOAT_LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_FLOAT_BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_FLOAT_BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_FLOAT64_LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_FLOAT64_LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_FLOAT64_BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_FLOAT64_BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_IEC958_SUBFRAME_LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_IEC958_SUBFRAME_LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_IEC958_SUBFRAME_BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_IEC958_SUBFRAME_BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_MU_LAW ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_MU_LAW\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_A_LAW ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_A_LAW\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_IMA_ADPCM ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_IMA_ADPCM\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_MPEG ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_MPEG\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_GSM ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_GSM\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_SPECIAL ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_SPECIAL\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S24_3LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S24_3LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S24_3BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S24_3BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U24_3LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U24_3LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U24_3BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U24_3BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S20_3LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S20_3LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S20_3BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S20_3BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U20_3LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U20_3LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U20_3BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U20_3BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S18_3LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S18_3LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S18_3BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S18_3BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U18_3LE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U18_3LE\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U18_3BE ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U18_3BE\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S16 ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S16\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U16 ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U16\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S24 ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S24\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U24 ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U24\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_S32 ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_S32\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_U32 ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_U32\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_FLOAT ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_FLOAT\n" )); - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_FLOAT64 ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_FLOAT64\n" )); - - if( alsa_snd_pcm_hw_params_test_format( pcm, hwParams, SND_PCM_FORMAT_IEC958_SUBFRAME ) >= 0) - PA_DEBUG(( "SND_PCM_FORMAT_IEC958_SUBFRAME\n" )); - - PA_DEBUG(( " -------------------------\n" )); -} - -static snd_pcm_format_t Pa2AlsaFormat( PaSampleFormat paFormat ) -{ - switch( paFormat ) - { - case paFloat32: - return SND_PCM_FORMAT_FLOAT; - - case paInt16: - return SND_PCM_FORMAT_S16; - - case paInt24: -#ifdef PA_LITTLE_ENDIAN - return SND_PCM_FORMAT_S24_3LE; -#elif defined PA_BIG_ENDIAN - return SND_PCM_FORMAT_S24_3BE; -#endif - - case paInt32: - return SND_PCM_FORMAT_S32; - - case paInt8: - return SND_PCM_FORMAT_S8; - - case paUInt8: - return SND_PCM_FORMAT_U8; - - default: - return SND_PCM_FORMAT_UNKNOWN; - } -} - -/** Open an ALSA pcm handle. - * - * The device to be open can be specified by name in a custom PaAlsaStreamInfo struct, or it will be by - * the Portaudio device number supplied in the stream parameters. - */ -static PaError AlsaOpen( const PaUtilHostApiRepresentation *hostApi, const PaStreamParameters *params, StreamDirection - streamDir, snd_pcm_t **pcm ) -{ - PaError result = paNoError; - int ret; - const char* deviceName = ""; - const PaAlsaDeviceInfo *deviceInfo = NULL; - PaAlsaStreamInfo *streamInfo = (PaAlsaStreamInfo *)params->hostApiSpecificStreamInfo; - - if( !streamInfo ) - { - deviceInfo = GetDeviceInfo( hostApi, params->device ); - deviceName = deviceInfo->alsaName; - } - else - deviceName = streamInfo->deviceString; - - PA_DEBUG(( "%s: Opening device %s\n", __FUNCTION__, deviceName )); - if( (ret = OpenPcm( pcm, deviceName, streamDir == StreamDirection_In ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK, - SND_PCM_NONBLOCK, 1 )) < 0 ) - { - /* Not to be closed */ - *pcm = NULL; - ENSURE_( ret, -EBUSY == ret ? paDeviceUnavailable : paBadIODeviceCombination ); - } - ENSURE_( alsa_snd_pcm_nonblock( *pcm, 0 ), paUnanticipatedHostError ); - -end: - return result; - -error: - goto end; -} - -static PaError TestParameters( const PaUtilHostApiRepresentation *hostApi, const PaStreamParameters *parameters, - double sampleRate, StreamDirection streamDir ) -{ - PaError result = paNoError; - snd_pcm_t *pcm = NULL; - PaSampleFormat availableFormats; - /* We are able to adapt to a number of channels less than what the device supports */ - unsigned int numHostChannels; - PaSampleFormat hostFormat; - snd_pcm_hw_params_t *hwParams; - alsa_snd_pcm_hw_params_alloca( &hwParams ); - - if( !parameters->hostApiSpecificStreamInfo ) - { - const PaAlsaDeviceInfo *devInfo = GetDeviceInfo( hostApi, parameters->device ); - numHostChannels = PA_MAX( parameters->channelCount, StreamDirection_In == streamDir ? - devInfo->minInputChannels : devInfo->minOutputChannels ); - } - else - numHostChannels = parameters->channelCount; - - PA_ENSURE( AlsaOpen( hostApi, parameters, streamDir, &pcm ) ); - - alsa_snd_pcm_hw_params_any( pcm, hwParams ); - - if( SetApproximateSampleRate( pcm, hwParams, sampleRate ) < 0 ) - { - result = paInvalidSampleRate; - goto error; - } - - if( alsa_snd_pcm_hw_params_set_channels( pcm, hwParams, numHostChannels ) < 0 ) - { - result = paInvalidChannelCount; - goto error; - } - - /* See if we can find a best possible match */ - availableFormats = GetAvailableFormats( pcm ); - PA_ENSURE( hostFormat = PaUtil_SelectClosestAvailableFormat( availableFormats, parameters->sampleFormat ) ); - - /* Some specific hardware (reported: Audio8 DJ) can fail with assertion during this step. */ - ENSURE_( alsa_snd_pcm_hw_params_set_format( pcm, hwParams, Pa2AlsaFormat( hostFormat ) ), paUnanticipatedHostError ); - - { - /* It happens that this call fails because the device is busy */ - int ret = 0; - if( ( ret = alsa_snd_pcm_hw_params( pcm, hwParams ) ) < 0 ) - { - if( -EINVAL == ret ) - { - /* Don't know what to return here */ - result = paBadIODeviceCombination; - goto error; - } - else if( -EBUSY == ret ) - { - result = paDeviceUnavailable; - PA_DEBUG(( "%s: Device is busy\n", __FUNCTION__ )); - } - else - { - result = paUnanticipatedHostError; - } - - ENSURE_( ret, result ); - } - } - -end: - if( pcm ) - { - alsa_snd_pcm_close( pcm ); - } - return result; - -error: - goto end; -} - -static PaError IsFormatSupported( struct PaUtilHostApiRepresentation *hostApi, - const PaStreamParameters *inputParameters, - const PaStreamParameters *outputParameters, - double sampleRate ) -{ - int inputChannelCount = 0, outputChannelCount = 0; - PaSampleFormat inputSampleFormat, outputSampleFormat; - PaError result = paFormatIsSupported; - - if( inputParameters ) - { - PA_ENSURE( ValidateParameters( inputParameters, hostApi, StreamDirection_In ) ); - - inputChannelCount = inputParameters->channelCount; - inputSampleFormat = inputParameters->sampleFormat; - } - - if( outputParameters ) - { - PA_ENSURE( ValidateParameters( outputParameters, hostApi, StreamDirection_Out ) ); - - outputChannelCount = outputParameters->channelCount; - outputSampleFormat = outputParameters->sampleFormat; - } - - if( inputChannelCount ) - { - if( ( result = TestParameters( hostApi, inputParameters, sampleRate, StreamDirection_In ) ) - != paNoError ) - goto error; - } - if ( outputChannelCount ) - { - if( ( result = TestParameters( hostApi, outputParameters, sampleRate, StreamDirection_Out ) ) - != paNoError ) - goto error; - } - - return paFormatIsSupported; - -error: - return result; -} - - -static PaError PaAlsaStreamComponent_Initialize( PaAlsaStreamComponent *self, PaAlsaHostApiRepresentation *alsaApi, - const PaStreamParameters *params, StreamDirection streamDir, int callbackMode ) -{ - PaError result = paNoError; - PaSampleFormat userSampleFormat = params->sampleFormat, hostSampleFormat = paNoError; - assert( params->channelCount > 0 ); - - /* Make sure things have an initial value */ - memset( self, 0, sizeof (PaAlsaStreamComponent) ); - - if( NULL == params->hostApiSpecificStreamInfo ) - { - const PaAlsaDeviceInfo *devInfo = GetDeviceInfo( &alsaApi->baseHostApiRep, params->device ); - self->numHostChannels = PA_MAX( params->channelCount, StreamDirection_In == streamDir ? devInfo->minInputChannels - : devInfo->minOutputChannels ); - self->deviceIsPlug = devInfo->isPlug; - PA_DEBUG(( "%s: Host Chans %c %i\n", __FUNCTION__, streamDir == StreamDirection_In ? 'C' : 'P', self->numHostChannels )); - } - else - { - /* We're blissfully unaware of the minimum channelCount */ - self->numHostChannels = params->channelCount; - /* Check if device name does not start with hw: to determine if it is a 'plug' device */ - if( strncmp( "hw:", ((PaAlsaStreamInfo *)params->hostApiSpecificStreamInfo)->deviceString, 3 ) != 0 ) - self->deviceIsPlug = 1; /* An Alsa plug device, not a direct hw device */ - } - if( self->deviceIsPlug && alsaApi->alsaLibVersion < ALSA_VERSION_INT( 1, 0, 16 ) ) - self->useReventFix = 1; /* Prior to Alsa1.0.16, plug devices may stutter without this fix */ - - self->device = params->device; - - PA_ENSURE( AlsaOpen( &alsaApi->baseHostApiRep, params, streamDir, &self->pcm ) ); - self->nfds = alsa_snd_pcm_poll_descriptors_count( self->pcm ); - - PA_ENSURE( hostSampleFormat = PaUtil_SelectClosestAvailableFormat( GetAvailableFormats( self->pcm ), userSampleFormat ) ); - - self->hostSampleFormat = hostSampleFormat; - self->nativeFormat = Pa2AlsaFormat( hostSampleFormat ); - self->hostInterleaved = self->userInterleaved = !( userSampleFormat & paNonInterleaved ); - self->numUserChannels = params->channelCount; - self->streamDir = streamDir; - self->canMmap = 0; - self->nonMmapBuffer = NULL; - self->nonMmapBufferSize = 0; - - if( !callbackMode && !self->userInterleaved ) - { - /* Pre-allocate non-interleaved user provided buffers */ - PA_UNLESS( self->userBuffers = PaUtil_AllocateMemory( sizeof (void *) * self->numUserChannels ), - paInsufficientMemory ); - } - -error: - - /* Log all available formats. */ - if ( hostSampleFormat == paSampleFormatNotSupported ) - { - LogAllAvailableFormats( self->pcm ); - PA_DEBUG(( "%s: Please provide the log output to PortAudio developers, your hardware does not have any sample format implemented yet.\n", __FUNCTION__ )); - } - - return result; -} - -static void PaAlsaStreamComponent_Terminate( PaAlsaStreamComponent *self ) -{ - alsa_snd_pcm_close( self->pcm ); - PaUtil_FreeMemory( self->userBuffers ); /* (Ptr can be NULL; PaUtil_FreeMemory includes a NULL check) */ - PaUtil_FreeMemory( self->nonMmapBuffer ); -} - -/* -static int nearbyint_(float value) { - if( value - (int)value > .5 ) - return (int)ceil( value ); - return (int)floor( value ); -} -*/ - -/** Initiate configuration, preparing for determining a period size suitable for both capture and playback components. - * - */ -static PaError PaAlsaStreamComponent_InitialConfigure( PaAlsaStreamComponent *self, const PaStreamParameters *params, - int primeBuffers, snd_pcm_hw_params_t *hwParams, double *sampleRate ) -{ - /* Configuration consists of setting all of ALSA's parameters. - * These parameters come in two flavors: hardware parameters - * and software parameters. Hardware parameters will affect - * the way the device is initialized, software parameters - * affect the way ALSA interacts with me, the user-level client. - */ - - PaError result = paNoError; - snd_pcm_access_t accessMode, alternateAccessMode; - int dir = 0; - snd_pcm_t *pcm = self->pcm; - double sr = *sampleRate; - unsigned int minPeriods = 2; - - /* self->framesPerPeriod = framesPerHostBuffer; */ - - /* ... fill up the configuration space with all possible - * combinations of parameters this device will accept */ - ENSURE_( alsa_snd_pcm_hw_params_any( pcm, hwParams ), paUnanticipatedHostError ); - - ENSURE_( alsa_snd_pcm_hw_params_set_periods_integer( pcm, hwParams ), paUnanticipatedHostError ); - /* I think there should be at least 2 periods (even though ALSA doesn't appear to enforce this) */ - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_set_periods_min( pcm, hwParams, &minPeriods, &dir ), paUnanticipatedHostError ); - - if( self->userInterleaved ) - { - accessMode = SND_PCM_ACCESS_MMAP_INTERLEAVED; - alternateAccessMode = SND_PCM_ACCESS_MMAP_NONINTERLEAVED; - - /* test if MMAP supported */ - self->canMmap = alsa_snd_pcm_hw_params_test_access( pcm, hwParams, accessMode ) >= 0 || - alsa_snd_pcm_hw_params_test_access( pcm, hwParams, alternateAccessMode ) >= 0; - - PA_DEBUG(( "%s: device MMAP SND_PCM_ACCESS_MMAP_INTERLEAVED: %s\n", __FUNCTION__, ( alsa_snd_pcm_hw_params_test_access( pcm, hwParams, accessMode ) >= 0 ? "YES" : "NO" ) )); - PA_DEBUG(( "%s: device MMAP SND_PCM_ACCESS_MMAP_NONINTERLEAVED: %s\n", __FUNCTION__, ( alsa_snd_pcm_hw_params_test_access( pcm, hwParams, alternateAccessMode ) >= 0 ? "YES" : "NO" ) )); - - if( !self->canMmap ) - { - accessMode = SND_PCM_ACCESS_RW_INTERLEAVED; - alternateAccessMode = SND_PCM_ACCESS_RW_NONINTERLEAVED; - } - } - else - { - accessMode = SND_PCM_ACCESS_MMAP_NONINTERLEAVED; - alternateAccessMode = SND_PCM_ACCESS_MMAP_INTERLEAVED; - - /* test if MMAP supported */ - self->canMmap = alsa_snd_pcm_hw_params_test_access( pcm, hwParams, accessMode ) >= 0 || - alsa_snd_pcm_hw_params_test_access( pcm, hwParams, alternateAccessMode ) >= 0; - - PA_DEBUG((" %s: device MMAP SND_PCM_ACCESS_MMAP_NONINTERLEAVED: %s\n", __FUNCTION__, ( alsa_snd_pcm_hw_params_test_access( pcm, hwParams, accessMode ) >= 0 ? "YES" : "NO" ) )); - PA_DEBUG(( "%s: device MMAP SND_PCM_ACCESS_MMAP_INTERLEAVED: %s\n", __FUNCTION__, ( alsa_snd_pcm_hw_params_test_access( pcm, hwParams, alternateAccessMode ) >= 0 ? "YES" : "NO" ) )); - - if( !self->canMmap ) - { - accessMode = SND_PCM_ACCESS_RW_NONINTERLEAVED; - alternateAccessMode = SND_PCM_ACCESS_RW_INTERLEAVED; - } - } - - PA_DEBUG(( "%s: device can MMAP: %s\n", __FUNCTION__, ( self->canMmap ? "YES" : "NO" ) )); - - /* If requested access mode fails, try alternate mode */ - if( alsa_snd_pcm_hw_params_set_access( pcm, hwParams, accessMode ) < 0 ) - { - int err = 0; - if( ( err = alsa_snd_pcm_hw_params_set_access( pcm, hwParams, alternateAccessMode )) < 0 ) - { - result = paUnanticipatedHostError; - PaUtil_SetLastHostErrorInfo( paALSA, err, alsa_snd_strerror( err ) ); - goto error; - } - /* Flip mode */ - self->hostInterleaved = !self->userInterleaved; - } - - /* Some specific hardware (reported: Audio8 DJ) can fail with assertion during this step. */ - ENSURE_( alsa_snd_pcm_hw_params_set_format( pcm, hwParams, self->nativeFormat ), paUnanticipatedHostError ); - - if( ( result = SetApproximateSampleRate( pcm, hwParams, sr )) != paUnanticipatedHostError ) - { - ENSURE_( GetExactSampleRate( hwParams, &sr ), paUnanticipatedHostError ); - if( result == paInvalidSampleRate ) /* From the SetApproximateSampleRate() call above */ - { /* The sample rate was returned as 'out of tolerance' of the one requested */ - PA_DEBUG(( "%s: Wanted %.3f, closest sample rate was %.3f\n", __FUNCTION__, sampleRate, sr )); - PA_ENSURE( paInvalidSampleRate ); - } - } - else - { - PA_ENSURE( paUnanticipatedHostError ); - } - - ENSURE_( alsa_snd_pcm_hw_params_set_channels( pcm, hwParams, self->numHostChannels ), paInvalidChannelCount ); - - *sampleRate = sr; - -end: - return result; - -error: - /* No particular action */ - goto end; -} - -/** Finish the configuration of the component's ALSA device. - * - * As part of this method, the component's alsaBufferSize attribute will be set. - * @param latency: The latency for this component. - */ -static PaError PaAlsaStreamComponent_FinishConfigure( PaAlsaStreamComponent *self, snd_pcm_hw_params_t* hwParams, - const PaStreamParameters *params, int primeBuffers, double sampleRate, PaTime* latency ) -{ - PaError result = paNoError; - snd_pcm_sw_params_t* swParams; - snd_pcm_uframes_t bufSz = 0; - *latency = -1.; - - alsa_snd_pcm_sw_params_alloca( &swParams ); - - bufSz = params->suggestedLatency * sampleRate + self->framesPerPeriod; - ENSURE_( alsa_snd_pcm_hw_params_set_buffer_size_near( self->pcm, hwParams, &bufSz ), paUnanticipatedHostError ); - - /* Set the parameters! */ - { - int r = alsa_snd_pcm_hw_params( self->pcm, hwParams ); -#ifdef PA_ENABLE_DEBUG_OUTPUT - if( r < 0 ) - { - snd_output_t *output = NULL; - alsa_snd_output_stdio_attach( &output, stderr, 0 ); - alsa_snd_pcm_hw_params_dump( hwParams, output ); - } -#endif - ENSURE_( r, paUnanticipatedHostError ); - } - if( alsa_snd_pcm_hw_params_get_buffer_size != NULL ) - { - ENSURE_( alsa_snd_pcm_hw_params_get_buffer_size( hwParams, &self->alsaBufferSize ), paUnanticipatedHostError ); - } - else - { - self->alsaBufferSize = bufSz; - } - - /* Latency in seconds */ - *latency = (self->alsaBufferSize - self->framesPerPeriod) / sampleRate; - - /* Now software parameters... */ - ENSURE_( alsa_snd_pcm_sw_params_current( self->pcm, swParams ), paUnanticipatedHostError ); - - ENSURE_( alsa_snd_pcm_sw_params_set_start_threshold( self->pcm, swParams, self->framesPerPeriod ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_sw_params_set_stop_threshold( self->pcm, swParams, self->alsaBufferSize ), paUnanticipatedHostError ); - - /* Silence buffer in the case of underrun */ - if( !primeBuffers ) /* XXX: Make sense? */ - { - snd_pcm_uframes_t boundary; - ENSURE_( alsa_snd_pcm_sw_params_get_boundary( swParams, &boundary ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_sw_params_set_silence_threshold( self->pcm, swParams, 0 ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_sw_params_set_silence_size( self->pcm, swParams, boundary ), paUnanticipatedHostError ); - } - - ENSURE_( alsa_snd_pcm_sw_params_set_avail_min( self->pcm, swParams, self->framesPerPeriod ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_sw_params_set_xfer_align( self->pcm, swParams, 1 ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_sw_params_set_tstamp_mode( self->pcm, swParams, SND_PCM_TSTAMP_ENABLE ), paUnanticipatedHostError ); - - /* Set the parameters! */ - ENSURE_( alsa_snd_pcm_sw_params( self->pcm, swParams ), paUnanticipatedHostError ); - -error: - return result; -} - -static PaError PaAlsaStream_Initialize( PaAlsaStream *self, PaAlsaHostApiRepresentation *alsaApi, const PaStreamParameters *inParams, - const PaStreamParameters *outParams, double sampleRate, unsigned long framesPerUserBuffer, PaStreamCallback callback, - PaStreamFlags streamFlags, void *userData ) -{ - PaError result = paNoError; - assert( self ); - - memset( self, 0, sizeof( PaAlsaStream ) ); - - if( NULL != callback ) - { - PaUtil_InitializeStreamRepresentation( &self->streamRepresentation, - &alsaApi->callbackStreamInterface, - callback, userData ); - self->callbackMode = 1; - } - else - { - PaUtil_InitializeStreamRepresentation( &self->streamRepresentation, - &alsaApi->blockingStreamInterface, - NULL, userData ); - } - - self->framesPerUserBuffer = framesPerUserBuffer; - self->neverDropInput = streamFlags & paNeverDropInput; - /* XXX: Ignore paPrimeOutputBuffersUsingStreamCallback until buffer priming is fully supported in pa_process.c */ - /* - if( outParams & streamFlags & paPrimeOutputBuffersUsingStreamCallback ) - self->primeBuffers = 1; - */ - memset( &self->capture, 0, sizeof (PaAlsaStreamComponent) ); - memset( &self->playback, 0, sizeof (PaAlsaStreamComponent) ); - if( inParams ) - { - PA_ENSURE( PaAlsaStreamComponent_Initialize( &self->capture, alsaApi, inParams, StreamDirection_In, NULL != callback ) ); - } - if( outParams ) - { - PA_ENSURE( PaAlsaStreamComponent_Initialize( &self->playback, alsaApi, outParams, StreamDirection_Out, NULL != callback ) ); - } - - assert( self->capture.nfds || self->playback.nfds ); - - PA_UNLESS( self->pfds = (struct pollfd*)PaUtil_AllocateMemory( ( self->capture.nfds + - self->playback.nfds ) * sizeof( struct pollfd ) ), paInsufficientMemory ); - - PaUtil_InitializeCpuLoadMeasurer( &self->cpuLoadMeasurer, sampleRate ); - ASSERT_CALL_( PaUnixMutex_Initialize( &self->stateMtx ), paNoError ); - -error: - return result; -} - -/** Free resources associated with stream, and eventually stream itself. - * - * Frees allocated memory, and terminates individual StreamComponents. - */ -static void PaAlsaStream_Terminate( PaAlsaStream *self ) -{ - assert( self ); - - if( self->capture.pcm ) - { - PaAlsaStreamComponent_Terminate( &self->capture ); - } - if( self->playback.pcm ) - { - PaAlsaStreamComponent_Terminate( &self->playback ); - } - - PaUtil_FreeMemory( self->pfds ); - ASSERT_CALL_( PaUnixMutex_Terminate( &self->stateMtx ), paNoError ); - - PaUtil_FreeMemory( self ); -} - -/** Calculate polling timeout - * - * @param frames Time to wait - * @return Polling timeout in milliseconds - */ -static int CalculatePollTimeout( const PaAlsaStream *stream, unsigned long frames ) -{ - assert( stream->streamRepresentation.streamInfo.sampleRate > 0.0 ); - /* Period in msecs, rounded up */ - return (int)ceil( 1000 * frames / stream->streamRepresentation.streamInfo.sampleRate ); -} - -/** Align value in backward direction. - * - * @param v: Value to align. - * @param align: Alignment. - */ -static unsigned long PaAlsa_AlignBackward(unsigned long v, unsigned long align) -{ - return ( v - ( align ? v % align : 0 ) ); -} - -/** Align value in forward direction. - * - * @param v: Value to align. - * @param align: Alignment. - */ -static unsigned long PaAlsa_AlignForward(unsigned long v, unsigned long align) -{ - unsigned long remainder = ( align ? ( v % align ) : 0); - return ( remainder != 0 ? v + ( align - remainder ) : v ); -} - -/** Get size of host buffer maintained from the number of user frames, sample rate and suggested latency. Minimum double buffering - * is maintained to allow 100% CPU usage inside user callback. - * - * @param userFramesPerBuffer: User buffer size in number of frames. - * @param suggestedLatency: User provided desired latency. - * @param sampleRate: Sample rate. - */ -static unsigned long PaAlsa_GetFramesPerHostBuffer(unsigned long userFramesPerBuffer, PaTime suggestedLatency, double sampleRate) -{ - unsigned long frames = userFramesPerBuffer + PA_MAX( userFramesPerBuffer, (unsigned long)( suggestedLatency * sampleRate ) ); - return frames; -} - -/** Determine size per host buffer. - * - * During this method call, the component's framesPerPeriod attribute gets computed, and the corresponding period size - * gets configured for the device. - * @param accurate: If the configured period size is non-integer, this will be set to 0. - */ -static PaError PaAlsaStreamComponent_DetermineFramesPerBuffer( PaAlsaStreamComponent* self, const PaStreamParameters* params, - unsigned long framesPerUserBuffer, double sampleRate, snd_pcm_hw_params_t* hwParams, int* accurate ) -{ - PaError result = paNoError; - unsigned long bufferSize, framesPerHostBuffer; - int dir = 0; - - /* Calculate host buffer size */ - bufferSize = PaAlsa_GetFramesPerHostBuffer(framesPerUserBuffer, params->suggestedLatency, sampleRate); - - /* Log */ - PA_DEBUG(( "%s: user-buffer (frames) = %lu\n", __FUNCTION__, framesPerUserBuffer )); - PA_DEBUG(( "%s: user-buffer (sec) = %f\n", __FUNCTION__, (double)(framesPerUserBuffer / sampleRate) )); - PA_DEBUG(( "%s: suggested latency (sec) = %f\n", __FUNCTION__, params->suggestedLatency )); - PA_DEBUG(( "%s: suggested host buffer (frames) = %lu\n", __FUNCTION__, bufferSize )); - PA_DEBUG(( "%s: suggested host buffer (sec) = %f\n", __FUNCTION__, (double)(bufferSize / sampleRate) )); - -#ifdef PA_ALSA_USE_OBSOLETE_HOST_BUFFER_CALC - - if( framesPerUserBuffer != paFramesPerBufferUnspecified ) - { - /* Preferably the host buffer size should be a multiple of the user buffer size */ - - if( bufferSize > framesPerUserBuffer ) - { - snd_pcm_uframes_t remainder = bufferSize % framesPerUserBuffer; - if( remainder > framesPerUserBuffer / 2. ) - bufferSize += framesPerUserBuffer - remainder; - else - bufferSize -= remainder; - - assert( bufferSize % framesPerUserBuffer == 0 ); - } - else if( framesPerUserBuffer % bufferSize != 0 ) - { - /* Find a good compromise between user specified latency and buffer size */ - if( bufferSize > framesPerUserBuffer * .75 ) - { - bufferSize = framesPerUserBuffer; - } - else - { - snd_pcm_uframes_t newSz = framesPerUserBuffer; - while( newSz / 2 >= bufferSize ) - { - if( framesPerUserBuffer % (newSz / 2) != 0 ) - { - /* No use dividing any further */ - break; - } - newSz /= 2; - } - bufferSize = newSz; - } - - assert( framesPerUserBuffer % bufferSize == 0 ); - } - } - -#endif - - { - unsigned numPeriods = numPeriods_, maxPeriods = 0, minPeriods = numPeriods_; - - /* It may be that the device only supports 2 periods for instance */ - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_get_periods_min( hwParams, &minPeriods, &dir ), paUnanticipatedHostError ); - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_get_periods_max( hwParams, &maxPeriods, &dir ), paUnanticipatedHostError ); - assert( maxPeriods > 1 ); - - /* Clamp to min/max */ - numPeriods = PA_MIN(maxPeriods, PA_MAX(minPeriods, numPeriods)); - - PA_DEBUG(( "%s: periods min = %lu, max = %lu, req = %lu \n", __FUNCTION__, minPeriods, maxPeriods, numPeriods )); - -#ifndef PA_ALSA_USE_OBSOLETE_HOST_BUFFER_CALC - - /* Calculate period size */ - framesPerHostBuffer = (bufferSize / numPeriods); - - /* Align & test size */ - if( framesPerUserBuffer != paFramesPerBufferUnspecified ) - { - /* Align to user buffer size */ - framesPerHostBuffer = PaAlsa_AlignForward(framesPerHostBuffer, framesPerUserBuffer); - - /* Test (borrowed from older implementation) */ - if( framesPerHostBuffer < framesPerUserBuffer ) - { - assert( framesPerUserBuffer % framesPerHostBuffer == 0 ); - if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer, 0 ) < 0 ) - { - if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer * 2, 0 ) == 0 ) - framesPerHostBuffer *= 2; - else if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer / 2, 0 ) == 0 ) - framesPerHostBuffer /= 2; - } - } - else - { - assert( framesPerHostBuffer % framesPerUserBuffer == 0 ); - if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer, 0 ) < 0 ) - { - if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer + framesPerUserBuffer, 0 ) == 0 ) - framesPerHostBuffer += framesPerUserBuffer; - else if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer - framesPerUserBuffer, 0 ) == 0 ) - framesPerHostBuffer -= framesPerUserBuffer; - } - } - } -#endif - -#ifdef PA_ALSA_USE_OBSOLETE_HOST_BUFFER_CALC - - if( framesPerUserBuffer != paFramesPerBufferUnspecified ) - { - /* Try to get a power-of-two of the user buffer size. */ - framesPerHostBuffer = framesPerUserBuffer; - if( framesPerHostBuffer < bufferSize ) - { - while( bufferSize / framesPerHostBuffer > numPeriods ) - { - framesPerHostBuffer *= 2; - } - /* One extra period is preferable to one less (should be more robust) */ - if( bufferSize / framesPerHostBuffer < numPeriods ) - { - framesPerHostBuffer /= 2; - } - } - else - { - while( bufferSize / framesPerHostBuffer < numPeriods ) - { - if( framesPerUserBuffer % ( framesPerHostBuffer / 2 ) != 0 ) - { - /* Can't be divided any further */ - break; - } - framesPerHostBuffer /= 2; - } - } - - if( framesPerHostBuffer < framesPerUserBuffer ) - { - assert( framesPerUserBuffer % framesPerHostBuffer == 0 ); - if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer, 0 ) < 0 ) - { - if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer * 2, 0 ) == 0 ) - framesPerHostBuffer *= 2; - else if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer / 2, 0 ) == 0 ) - framesPerHostBuffer /= 2; - } - } - else - { - assert( framesPerHostBuffer % framesPerUserBuffer == 0 ); - if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer, 0 ) < 0 ) - { - if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer + framesPerUserBuffer, 0 ) == 0 ) - framesPerHostBuffer += framesPerUserBuffer; - else if( alsa_snd_pcm_hw_params_test_period_size( self->pcm, hwParams, framesPerHostBuffer - framesPerUserBuffer, 0 ) == 0 ) - framesPerHostBuffer -= framesPerUserBuffer; - } - } - } - else - { - framesPerHostBuffer = bufferSize / numPeriods; - } - - /* non-mmap mode needs a reasonably-sized buffer or it'll stutter */ - if( !self->canMmap && framesPerHostBuffer < 2048 ) - framesPerHostBuffer = 2048; -#endif - PA_DEBUG(( "%s: suggested host buffer period = %lu \n", __FUNCTION__, framesPerHostBuffer )); - } - - { - /* Get min/max period sizes and adjust our chosen */ - snd_pcm_uframes_t min = 0, max = 0, minmax_diff; - ENSURE_( alsa_snd_pcm_hw_params_get_period_size_min( hwParams, &min, NULL ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_hw_params_get_period_size_max( hwParams, &max, NULL ), paUnanticipatedHostError ); - minmax_diff = max - min; - - if( framesPerHostBuffer < min ) - { - PA_DEBUG(( "%s: The determined period size (%lu) is less than minimum (%lu)\n", __FUNCTION__, framesPerHostBuffer, min )); - framesPerHostBuffer = (( minmax_diff == 2 ) ? min + 1 : min ); - } - else if( framesPerHostBuffer > max ) - { - PA_DEBUG(( "%s: The determined period size (%lu) is greater than maximum (%lu)\n", __FUNCTION__, framesPerHostBuffer, max )); - framesPerHostBuffer = (( minmax_diff == 2 ) ? max - 1 : max ); - } - - PA_DEBUG(( "%s: device period minimum = %lu\n", __FUNCTION__, min )); - PA_DEBUG(( "%s: device period maximum = %lu\n", __FUNCTION__, max )); - PA_DEBUG(( "%s: host buffer period = %lu\n", __FUNCTION__, framesPerHostBuffer )); - PA_DEBUG(( "%s: host buffer period latency = %f\n", __FUNCTION__, (double)( framesPerHostBuffer / sampleRate ) )); - - /* Try setting period size */ - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_set_period_size_near( self->pcm, hwParams, &framesPerHostBuffer, &dir ), paUnanticipatedHostError ); - if( dir != 0 ) - { - PA_DEBUG(( "%s: The configured period size is non-integer.\n", __FUNCTION__, dir )); - *accurate = 0; - } - } - - /* Set result */ - self->framesPerPeriod = framesPerHostBuffer; - -error: - return result; -} - -/* We need to determine how many frames per host buffer (period) to use. Our - * goals are to provide the best possible performance, but also to - * honor the requested latency settings as closely as we can. Therefore this - * decision is based on: - * - * - the period sizes that playback and/or capture support. The - * host buffer size has to be one of these. - * - the number of periods that playback and/or capture support. - * - * We want to make period_size*(num_periods-1) to be as close as possible - * to latency*rate for both playback and capture. - * - * This method will determine suitable period sizes for capture and playback handles, and report the maximum number of - * frames per host buffer. The latter is relevant, in case we should be so unfortunate that the period size differs - * between capture and playback. If this should happen, the stream's hostBufferSizeMode attribute will be set to - * paUtilBoundedHostBufferSize, because the best we can do is limit the size of individual host buffers to the upper - * bound. The size of host buffers scheduled for processing should only matter if the user has specified a buffer size, - * but when he/she does we must strive for an optimal configuration. By default we'll opt for a fixed host buffer size, - * which should be fine if the period size is the same for capture and playback. In general, if there is a specified user - * buffer size, this method tries it best to determine a period size which is a multiple of the user buffer size. - * - * The framesPerPeriod attributes of the individual capture and playback components of the stream are set to corresponding - * values determined here. Since these should be reported as - * - * This is one of those blocks of code that will just take a lot of - * refinement to be any good. - * - * In the full-duplex case it is possible that the routine was unable - * to find a number of frames per buffer acceptable to both devices - * TODO: Implement an algorithm to find the value closest to acceptance - * by both devices, to minimize difference between period sizes? - * - * @param determinedFramesPerHostBuffer: The determined host buffer size. - */ -static PaError PaAlsaStream_DetermineFramesPerBuffer( PaAlsaStream* self, double sampleRate, const PaStreamParameters* inputParameters, - const PaStreamParameters* outputParameters, unsigned long framesPerUserBuffer, snd_pcm_hw_params_t* hwParamsCapture, - snd_pcm_hw_params_t* hwParamsPlayback, PaUtilHostBufferSizeMode* hostBufferSizeMode ) -{ - PaError result = paNoError; - unsigned long framesPerHostBuffer = 0; - int dir = 0; - int accurate = 1; - unsigned numPeriods = numPeriods_; - - if( self->capture.pcm && self->playback.pcm ) - { - if( framesPerUserBuffer == paFramesPerBufferUnspecified ) - { - /* Come up with a common desired latency */ - snd_pcm_uframes_t desiredBufSz, e, minPeriodSize, maxPeriodSize, optimalPeriodSize, periodSize, - minCapture, minPlayback, maxCapture, maxPlayback; - - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_get_period_size_min( hwParamsCapture, &minCapture, &dir ), paUnanticipatedHostError ); - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_get_period_size_min( hwParamsPlayback, &minPlayback, &dir ), paUnanticipatedHostError ); - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_get_period_size_max( hwParamsCapture, &maxCapture, &dir ), paUnanticipatedHostError ); - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_get_period_size_max( hwParamsPlayback, &maxPlayback, &dir ), paUnanticipatedHostError ); - minPeriodSize = PA_MAX( minPlayback, minCapture ); - maxPeriodSize = PA_MIN( maxPlayback, maxCapture ); - PA_UNLESS( minPeriodSize <= maxPeriodSize, paBadIODeviceCombination ); - - desiredBufSz = (snd_pcm_uframes_t)( PA_MIN( outputParameters->suggestedLatency, inputParameters->suggestedLatency ) - * sampleRate ); - /* Clamp desiredBufSz */ - { - snd_pcm_uframes_t maxBufferSize; - snd_pcm_uframes_t maxBufferSizeCapture, maxBufferSizePlayback; - ENSURE_( alsa_snd_pcm_hw_params_get_buffer_size_max( hwParamsCapture, &maxBufferSizeCapture ), paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_hw_params_get_buffer_size_max( hwParamsPlayback, &maxBufferSizePlayback ), paUnanticipatedHostError ); - maxBufferSize = PA_MIN( maxBufferSizeCapture, maxBufferSizePlayback ); - - desiredBufSz = PA_MIN( desiredBufSz, maxBufferSize ); - } - - /* Find the closest power of 2 */ - e = ilogb( minPeriodSize ); - if( minPeriodSize & ( minPeriodSize - 1 ) ) - e += 1; - periodSize = (snd_pcm_uframes_t)pow( 2, e ); - - while( periodSize <= maxPeriodSize ) - { - if( alsa_snd_pcm_hw_params_test_period_size( self->playback.pcm, hwParamsPlayback, periodSize, 0 ) >= 0 && - alsa_snd_pcm_hw_params_test_period_size( self->capture.pcm, hwParamsCapture, periodSize, 0 ) >= 0 ) - { - /* OK! */ - break; - } - - periodSize *= 2; - } - - optimalPeriodSize = PA_MAX( desiredBufSz / numPeriods, minPeriodSize ); - optimalPeriodSize = PA_MIN( optimalPeriodSize, maxPeriodSize ); - - /* Find the closest power of 2 */ - e = ilogb( optimalPeriodSize ); - if( optimalPeriodSize & (optimalPeriodSize - 1) ) - e += 1; - optimalPeriodSize = (snd_pcm_uframes_t)pow( 2, e ); - - while( optimalPeriodSize >= periodSize ) - { - if( alsa_snd_pcm_hw_params_test_period_size( self->capture.pcm, hwParamsCapture, optimalPeriodSize, 0 ) - >= 0 && alsa_snd_pcm_hw_params_test_period_size( self->playback.pcm, hwParamsPlayback, - optimalPeriodSize, 0 ) >= 0 ) - { - break; - } - optimalPeriodSize /= 2; - } - - if( optimalPeriodSize > periodSize ) - periodSize = optimalPeriodSize; - - if( periodSize <= maxPeriodSize ) - { - /* Looks good, the periodSize _should_ be acceptable by both devices */ - ENSURE_( alsa_snd_pcm_hw_params_set_period_size( self->capture.pcm, hwParamsCapture, periodSize, 0 ), - paUnanticipatedHostError ); - ENSURE_( alsa_snd_pcm_hw_params_set_period_size( self->playback.pcm, hwParamsPlayback, periodSize, 0 ), - paUnanticipatedHostError ); - self->capture.framesPerPeriod = self->playback.framesPerPeriod = periodSize; - framesPerHostBuffer = periodSize; - } - else - { - /* Unable to find a common period size, oh well */ - optimalPeriodSize = PA_MAX( desiredBufSz / numPeriods, minPeriodSize ); - optimalPeriodSize = PA_MIN( optimalPeriodSize, maxPeriodSize ); - - self->capture.framesPerPeriod = optimalPeriodSize; - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_set_period_size_near( self->capture.pcm, hwParamsCapture, &self->capture.framesPerPeriod, &dir ), - paUnanticipatedHostError ); - self->playback.framesPerPeriod = optimalPeriodSize; - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_set_period_size_near( self->playback.pcm, hwParamsPlayback, &self->playback.framesPerPeriod, &dir ), - paUnanticipatedHostError ); - framesPerHostBuffer = PA_MAX( self->capture.framesPerPeriod, self->playback.framesPerPeriod ); - *hostBufferSizeMode = paUtilBoundedHostBufferSize; - } - } - else - { - /* We choose the simple route and determine a suitable number of frames per buffer for one component of - * the stream, then we hope that this will work for the other component too (it should!). - */ - - unsigned maxPeriods = 0; - PaAlsaStreamComponent* first = &self->capture, * second = &self->playback; - const PaStreamParameters* firstStreamParams = inputParameters; - snd_pcm_hw_params_t* firstHwParams = hwParamsCapture, * secondHwParams = hwParamsPlayback; - - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_get_periods_max( hwParamsPlayback, &maxPeriods, &dir ), paUnanticipatedHostError ); - if( maxPeriods < numPeriods ) - { - /* The playback component is trickier to get right, try that first */ - first = &self->playback; - second = &self->capture; - firstStreamParams = outputParameters; - firstHwParams = hwParamsPlayback; - secondHwParams = hwParamsCapture; - } - - PA_ENSURE( PaAlsaStreamComponent_DetermineFramesPerBuffer( first, firstStreamParams, framesPerUserBuffer, - sampleRate, firstHwParams, &accurate ) ); - - second->framesPerPeriod = first->framesPerPeriod; - dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_set_period_size_near( second->pcm, secondHwParams, &second->framesPerPeriod, &dir ), - paUnanticipatedHostError ); - if( self->capture.framesPerPeriod == self->playback.framesPerPeriod ) - { - framesPerHostBuffer = self->capture.framesPerPeriod; - } - else - { - framesPerHostBuffer = PA_MAX( self->capture.framesPerPeriod, self->playback.framesPerPeriod ); - *hostBufferSizeMode = paUtilBoundedHostBufferSize; - } - } - } - else /* half-duplex is a slightly simpler case */ - { - if( self->capture.pcm ) - { - PA_ENSURE( PaAlsaStreamComponent_DetermineFramesPerBuffer( &self->capture, inputParameters, framesPerUserBuffer, - sampleRate, hwParamsCapture, &accurate) ); - framesPerHostBuffer = self->capture.framesPerPeriod; - } - else - { - assert( self->playback.pcm ); - PA_ENSURE( PaAlsaStreamComponent_DetermineFramesPerBuffer( &self->playback, outputParameters, framesPerUserBuffer, - sampleRate, hwParamsPlayback, &accurate ) ); - framesPerHostBuffer = self->playback.framesPerPeriod; - } - } - - PA_UNLESS( framesPerHostBuffer != 0, paInternalError ); - self->maxFramesPerHostBuffer = framesPerHostBuffer; - - if( !self->playback.canMmap || !accurate ) - { - /* Don't know the exact size per host buffer */ - *hostBufferSizeMode = paUtilBoundedHostBufferSize; - /* Raise upper bound */ - if( !accurate ) - ++self->maxFramesPerHostBuffer; - } - -error: - return result; -} - -/** Set up ALSA stream parameters. - * - */ -static PaError PaAlsaStream_Configure( PaAlsaStream *self, const PaStreamParameters *inParams, const PaStreamParameters* - outParams, double sampleRate, unsigned long framesPerUserBuffer, double* inputLatency, double* outputLatency, - PaUtilHostBufferSizeMode* hostBufferSizeMode ) -{ - PaError result = paNoError; - double realSr = sampleRate; - snd_pcm_hw_params_t* hwParamsCapture, * hwParamsPlayback; - - alsa_snd_pcm_hw_params_alloca( &hwParamsCapture ); - alsa_snd_pcm_hw_params_alloca( &hwParamsPlayback ); - - if( self->capture.pcm ) - PA_ENSURE( PaAlsaStreamComponent_InitialConfigure( &self->capture, inParams, self->primeBuffers, hwParamsCapture, - &realSr ) ); - if( self->playback.pcm ) - PA_ENSURE( PaAlsaStreamComponent_InitialConfigure( &self->playback, outParams, self->primeBuffers, hwParamsPlayback, - &realSr ) ); - - PA_ENSURE( PaAlsaStream_DetermineFramesPerBuffer( self, realSr, inParams, outParams, framesPerUserBuffer, - hwParamsCapture, hwParamsPlayback, hostBufferSizeMode ) ); - - if( self->capture.pcm ) - { - assert( self->capture.framesPerPeriod != 0 ); - PA_ENSURE( PaAlsaStreamComponent_FinishConfigure( &self->capture, hwParamsCapture, inParams, self->primeBuffers, realSr, - inputLatency ) ); - PA_DEBUG(( "%s: Capture period size: %lu, latency: %f\n", __FUNCTION__, self->capture.framesPerPeriod, *inputLatency )); - } - if( self->playback.pcm ) - { - assert( self->playback.framesPerPeriod != 0 ); - PA_ENSURE( PaAlsaStreamComponent_FinishConfigure( &self->playback, hwParamsPlayback, outParams, self->primeBuffers, realSr, - outputLatency ) ); - PA_DEBUG(( "%s: Playback period size: %lu, latency: %f\n", __FUNCTION__, self->playback.framesPerPeriod, *outputLatency )); - } - - /* Should be exact now */ - self->streamRepresentation.streamInfo.sampleRate = realSr; - - /* this will cause the two streams to automatically start/stop/prepare in sync. - * We only need to execute these operations on one of the pair. - * A: We don't want to do this on a blocking stream. - */ - if( self->callbackMode && self->capture.pcm && self->playback.pcm ) - { - int err = alsa_snd_pcm_link( self->capture.pcm, self->playback.pcm ); - if( err == 0 ) - self->pcmsSynced = 1; - else - PA_DEBUG(( "%s: Unable to sync pcms: %s\n", __FUNCTION__, alsa_snd_strerror( err ) )); - } - - { - unsigned long minFramesPerHostBuffer = PA_MIN( self->capture.pcm ? self->capture.framesPerPeriod : ULONG_MAX, - self->playback.pcm ? self->playback.framesPerPeriod : ULONG_MAX ); - self->pollTimeout = CalculatePollTimeout( self, minFramesPerHostBuffer ); /* Period in msecs, rounded up */ - - /* Time before watchdog unthrottles realtime thread == 1/4 of period time in msecs */ - /* self->threading.throttledSleepTime = (unsigned long) (minFramesPerHostBuffer / sampleRate / 4 * 1000); */ - } - - if( self->callbackMode ) - { - /* If the user expects a certain number of frames per callback we will either have to rely on block adaption - * (framesPerHostBuffer is not an integer multiple of framesPerPeriod) or we can simply align the number - * of host buffer frames with what the user specified */ - if( self->framesPerUserBuffer != paFramesPerBufferUnspecified ) - { - /* self->alignFrames = 1; */ - - /* Unless the ratio between number of host and user buffer frames is an integer we will have to rely - * on block adaption */ - /* - if( framesPerHostBuffer % framesPerPeriod != 0 || (self->capture.pcm && self->playback.pcm && - self->capture.framesPerPeriod != self->playback.framesPerPeriod) ) - self->useBlockAdaption = 1; - else - self->alignFrames = 1; - */ - } - } - -error: - return result; -} - -static PaError OpenStream( struct PaUtilHostApiRepresentation *hostApi, - PaStream** s, - const PaStreamParameters *inputParameters, - const PaStreamParameters *outputParameters, - double sampleRate, - unsigned long framesPerBuffer, - PaStreamFlags streamFlags, - PaStreamCallback* callback, - void *userData ) -{ - PaError result = paNoError; - PaAlsaHostApiRepresentation *alsaHostApi = (PaAlsaHostApiRepresentation*)hostApi; - PaAlsaStream *stream = NULL; - PaSampleFormat hostInputSampleFormat = 0, hostOutputSampleFormat = 0; - PaSampleFormat inputSampleFormat = 0, outputSampleFormat = 0; - int numInputChannels = 0, numOutputChannels = 0; - PaTime inputLatency, outputLatency; - /* Operate with fixed host buffer size by default, since other modes will invariably lead to block adaption */ - /* XXX: Use Bounded by default? Output tends to get stuttery with Fixed ... */ - PaUtilHostBufferSizeMode hostBufferSizeMode = paUtilFixedHostBufferSize; - - if( ( streamFlags & paPlatformSpecificFlags ) != 0 ) - return paInvalidFlag; - - if( inputParameters ) - { - PA_ENSURE( ValidateParameters( inputParameters, hostApi, StreamDirection_In ) ); - - numInputChannels = inputParameters->channelCount; - inputSampleFormat = inputParameters->sampleFormat; - } - if( outputParameters ) - { - PA_ENSURE( ValidateParameters( outputParameters, hostApi, StreamDirection_Out ) ); - - numOutputChannels = outputParameters->channelCount; - outputSampleFormat = outputParameters->sampleFormat; - } - - /* XXX: Why do we support this anyway? */ - if( framesPerBuffer == paFramesPerBufferUnspecified && getenv( "PA_ALSA_PERIODSIZE" ) != NULL ) - { - PA_DEBUG(( "%s: Getting framesPerBuffer (Alsa period-size) from environment\n", __FUNCTION__ )); - framesPerBuffer = atoi( getenv("PA_ALSA_PERIODSIZE") ); - } - - PA_UNLESS( stream = (PaAlsaStream*)PaUtil_AllocateMemory( sizeof(PaAlsaStream) ), paInsufficientMemory ); - PA_ENSURE( PaAlsaStream_Initialize( stream, alsaHostApi, inputParameters, outputParameters, sampleRate, - framesPerBuffer, callback, streamFlags, userData ) ); - - PA_ENSURE( PaAlsaStream_Configure( stream, inputParameters, outputParameters, sampleRate, framesPerBuffer, - &inputLatency, &outputLatency, &hostBufferSizeMode ) ); - hostInputSampleFormat = stream->capture.hostSampleFormat | (!stream->capture.hostInterleaved ? paNonInterleaved : 0); - hostOutputSampleFormat = stream->playback.hostSampleFormat | (!stream->playback.hostInterleaved ? paNonInterleaved : 0); - - PA_ENSURE( PaUtil_InitializeBufferProcessor( &stream->bufferProcessor, - numInputChannels, inputSampleFormat, hostInputSampleFormat, - numOutputChannels, outputSampleFormat, hostOutputSampleFormat, - sampleRate, streamFlags, framesPerBuffer, stream->maxFramesPerHostBuffer, - hostBufferSizeMode, callback, userData ) ); - - /* Ok, buffer processor is initialized, now we can deduce it's latency */ - if( numInputChannels > 0 ) - stream->streamRepresentation.streamInfo.inputLatency = inputLatency + (PaTime)( - PaUtil_GetBufferProcessorInputLatencyFrames( &stream->bufferProcessor ) / sampleRate); - if( numOutputChannels > 0 ) - stream->streamRepresentation.streamInfo.outputLatency = outputLatency + (PaTime)( - PaUtil_GetBufferProcessorOutputLatencyFrames( &stream->bufferProcessor ) / sampleRate); - - PA_DEBUG(( "%s: Stream: framesPerBuffer = %lu, maxFramesPerHostBuffer = %lu, latency i=%f, o=%f\n", __FUNCTION__, framesPerBuffer, stream->maxFramesPerHostBuffer, stream->streamRepresentation.streamInfo.inputLatency, stream->streamRepresentation.streamInfo.outputLatency)); - - *s = (PaStream*)stream; - - return result; - -error: - if( stream ) - { - PA_DEBUG(( "%s: Stream in error, terminating\n", __FUNCTION__ )); - PaAlsaStream_Terminate( stream ); - } - - return result; -} - -static PaError CloseStream( PaStream* s ) -{ - PaError result = paNoError; - PaAlsaStream *stream = (PaAlsaStream*)s; - - PaUtil_TerminateBufferProcessor( &stream->bufferProcessor ); - PaUtil_TerminateStreamRepresentation( &stream->streamRepresentation ); - - PaAlsaStream_Terminate( stream ); - - return result; -} - -static void SilenceBuffer( PaAlsaStream *stream ) -{ - const snd_pcm_channel_area_t *areas; - snd_pcm_uframes_t frames = (snd_pcm_uframes_t)alsa_snd_pcm_avail_update( stream->playback.pcm ), offset; - - alsa_snd_pcm_mmap_begin( stream->playback.pcm, &areas, &offset, &frames ); - alsa_snd_pcm_areas_silence( areas, offset, stream->playback.numHostChannels, frames, stream->playback.nativeFormat ); - alsa_snd_pcm_mmap_commit( stream->playback.pcm, offset, frames ); -} - -/** Start/prepare pcm(s) for streaming. - * - * Depending on whether the stream is in callback or blocking mode, we will respectively start or simply - * prepare the playback pcm. If the buffer has _not_ been primed, we will in callback mode prepare and - * silence the buffer before starting playback. In blocking mode we simply prepare, as the playback will - * be started automatically as the user writes to output. - * - * The capture pcm, however, will simply be prepared and started. - */ -static PaError AlsaStart( PaAlsaStream *stream, int priming ) -{ - PaError result = paNoError; - - if( stream->playback.pcm ) - { - if( stream->callbackMode ) - { - if( !priming ) - { - /* Buffer isn't primed, so prepare and silence */ - ENSURE_( alsa_snd_pcm_prepare( stream->playback.pcm ), paUnanticipatedHostError ); - if( stream->playback.canMmap ) - SilenceBuffer( stream ); - } - if( stream->playback.canMmap ) - ENSURE_( alsa_snd_pcm_start( stream->playback.pcm ), paUnanticipatedHostError ); - } - else - ENSURE_( alsa_snd_pcm_prepare( stream->playback.pcm ), paUnanticipatedHostError ); - } - if( stream->capture.pcm && !stream->pcmsSynced ) - { - ENSURE_( alsa_snd_pcm_prepare( stream->capture.pcm ), paUnanticipatedHostError ); - /* For a blocking stream we want to start capture as well, since nothing will happen otherwise */ - ENSURE_( alsa_snd_pcm_start( stream->capture.pcm ), paUnanticipatedHostError ); - } - -end: - return result; -error: - goto end; -} - -/** Utility function for determining if pcms are in running state. - * - */ -#if 0 -static int IsRunning( PaAlsaStream *stream ) -{ - int result = 0; - - PA_ENSURE( PaUnixMutex_Lock( &stream->stateMtx ) ); - if( stream->capture.pcm ) - { - snd_pcm_state_t capture_state = alsa_snd_pcm_state( stream->capture.pcm ); - - if( capture_state == SND_PCM_STATE_RUNNING || capture_state == SND_PCM_STATE_XRUN - || capture_state == SND_PCM_STATE_DRAINING ) - { - result = 1; - goto end; - } - } - - if( stream->playback.pcm ) - { - snd_pcm_state_t playback_state = alsa_snd_pcm_state( stream->playback.pcm ); - - if( playback_state == SND_PCM_STATE_RUNNING || playback_state == SND_PCM_STATE_XRUN - || playback_state == SND_PCM_STATE_DRAINING ) - { - result = 1; - goto end; - } - } - -end: - ASSERT_CALL_( PaUnixMutex_Unlock( &stream->stateMtx ), paNoError ); - return result; -error: - goto error; -} -#endif - -static PaError StartStream( PaStream *s ) -{ - PaError result = paNoError; - PaAlsaStream* stream = (PaAlsaStream*)s; - int streamStarted = 0; /* So we can know whether we need to take the stream down */ - - /* Ready the processor */ - PaUtil_ResetBufferProcessor( &stream->bufferProcessor ); - - /* Set now, so we can test for activity further down */ - stream->isActive = 1; - - if( stream->callbackMode ) - { - PA_ENSURE( PaUnixThread_New( &stream->thread, &CallbackThreadFunc, stream, 1., stream->rtSched ) ); - } - else - { - PA_ENSURE( AlsaStart( stream, 0 ) ); - streamStarted = 1; - } - -end: - return result; -error: - if( streamStarted ) - { - AbortStream( stream ); - } - stream->isActive = 0; - - goto end; -} - -/** Stop PCM handle, either softly or abruptly. - */ -static PaError AlsaStop( PaAlsaStream *stream, int abort ) -{ - PaError result = paNoError; - /* XXX: alsa_snd_pcm_drain tends to lock up, avoid it until we find out more */ - abort = 1; - /* - if( stream->capture.pcm && !strcmp( Pa_GetDeviceInfo( stream->capture.device )->name, - "dmix" ) ) - { - abort = 1; - } - else if( stream->playback.pcm && !strcmp( Pa_GetDeviceInfo( stream->playback.device )->name, - "dmix" ) ) - { - abort = 1; - } - */ - - if( abort ) - { - if( stream->playback.pcm ) - { - ENSURE_( alsa_snd_pcm_drop( stream->playback.pcm ), paUnanticipatedHostError ); - } - if( stream->capture.pcm && !stream->pcmsSynced ) - { - ENSURE_( alsa_snd_pcm_drop( stream->capture.pcm ), paUnanticipatedHostError ); - } - - PA_DEBUG(( "%s: Dropped frames\n", __FUNCTION__ )); - } - else - { - if( stream->playback.pcm ) - { - ENSURE_( alsa_snd_pcm_nonblock( stream->playback.pcm, 0 ), paUnanticipatedHostError ); - if( alsa_snd_pcm_drain( stream->playback.pcm ) < 0 ) - { - PA_DEBUG(( "%s: Draining playback handle failed!\n", __FUNCTION__ )); - } - } - if( stream->capture.pcm && !stream->pcmsSynced ) - { - /* We don't need to retrieve any remaining frames */ - if( alsa_snd_pcm_drain( stream->capture.pcm ) < 0 ) - { - PA_DEBUG(( "%s: Draining capture handle failed!\n", __FUNCTION__ )); - } - } - } - -end: - return result; -error: - goto end; -} - -/** Stop or abort stream. - * - * If a stream is in callback mode we will have to inspect whether the background thread has - * finished, or we will have to take it out. In either case we join the thread before - * returning. In blocking mode, we simply tell ALSA to stop abruptly (abort) or finish - * buffers (drain) - * - * Stream will be considered inactive (!PaAlsaStream::isActive) after a call to this function - */ -static PaError RealStop( PaAlsaStream *stream, int abort ) -{ - PaError result = paNoError; - - /* First deal with the callback thread, cancelling and/or joining - * it if necessary - */ - if( stream->callbackMode ) - { - PaError threadRes; - stream->callbackAbort = abort; - - if( !abort ) - { - PA_DEBUG(( "Stopping callback\n" )); - } - PA_ENSURE( PaUnixThread_Terminate( &stream->thread, !abort, &threadRes ) ); - if( threadRes != paNoError ) - { - PA_DEBUG(( "Callback thread returned: %d\n", threadRes )); - } -#if 0 - if( watchdogRes != paNoError ) - PA_DEBUG(( "Watchdog thread returned: %d\n", watchdogRes )); -#endif - - stream->callback_finished = 0; - } - else - { - PA_ENSURE( AlsaStop( stream, abort ) ); - } - - stream->isActive = 0; - -end: - return result; - -error: - goto end; -} - -static PaError StopStream( PaStream *s ) -{ - return RealStop( (PaAlsaStream *) s, 0 ); -} - -static PaError AbortStream( PaStream *s ) -{ - return RealStop( (PaAlsaStream * ) s, 1 ); -} - -/** The stream is considered stopped before StartStream, or AFTER a call to Abort/StopStream (callback - * returning !paContinue is not considered) - * - */ -static PaError IsStreamStopped( PaStream *s ) -{ - PaAlsaStream *stream = (PaAlsaStream *)s; - - /* callback_finished indicates we need to join callback thread (ie. in Abort/StopStream) */ - return !IsStreamActive( s ) && !stream->callback_finished; -} - -static PaError IsStreamActive( PaStream *s ) -{ - PaAlsaStream *stream = (PaAlsaStream*)s; - return stream->isActive; -} - -static PaTime GetStreamTime( PaStream *s ) -{ - PaAlsaStream *stream = (PaAlsaStream*)s; - - snd_timestamp_t timestamp; - snd_pcm_status_t* status; - alsa_snd_pcm_status_alloca( &status ); - - /* TODO: what if we have both? does it really matter? */ - - /* TODO: if running in callback mode, this will mean - * libasound routines are being called from multiple threads. - * need to verify that libasound is thread-safe. */ - - if( stream->capture.pcm ) - { - alsa_snd_pcm_status( stream->capture.pcm, status ); - } - else if( stream->playback.pcm ) - { - alsa_snd_pcm_status( stream->playback.pcm, status ); - } - - alsa_snd_pcm_status_get_tstamp( status, ×tamp ); - return timestamp.tv_sec + (PaTime)timestamp.tv_usec / 1e6; -} - -static double GetStreamCpuLoad( PaStream* s ) -{ - PaAlsaStream *stream = (PaAlsaStream*)s; - - return PaUtil_GetCpuLoad( &stream->cpuLoadMeasurer ); -} - -/* Set the stream sample rate to a nominal value requested; allow only a defined tolerance range */ -static int SetApproximateSampleRate( snd_pcm_t *pcm, snd_pcm_hw_params_t *hwParams, double sampleRate ) -{ - PaError result = paNoError; - unsigned int reqRate, setRate, deviation; - - assert( pcm && hwParams ); - - /* The Alsa sample rate is set by integer value; also the actual rate may differ */ - reqRate = setRate = (unsigned int) sampleRate; - - ENSURE_( alsa_snd_pcm_hw_params_set_rate_near( pcm, hwParams, &setRate, NULL ), paUnanticipatedHostError ); - /* The value actually set will be put in 'setRate' (may be way off); check the deviation as a proportion - * of the requested-rate with reference to the max-deviate-ratio (larger values allow less deviation) */ - deviation = abs( (int)setRate - (int)reqRate ); - if( deviation > 0 && deviation * RATE_MAX_DEVIATE_RATIO > reqRate ) - result = paInvalidSampleRate; - -end: - return result; - -error: - /* Log */ - { - unsigned int _min = 0, _max = 0; - int _dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_get_rate_min( hwParams, &_min, &_dir ), paUnanticipatedHostError ); - _dir = 0; - ENSURE_( alsa_snd_pcm_hw_params_get_rate_max( hwParams, &_max, &_dir ), paUnanticipatedHostError ); - PA_DEBUG(( "%s: SR min = %u, max = %u, req = %u\n", __FUNCTION__, _min, _max, reqRate )); - } - goto end; -} - -/* Return exact sample rate in param sampleRate */ -static int GetExactSampleRate( snd_pcm_hw_params_t *hwParams, double *sampleRate ) -{ - unsigned int num, den = 1; - int err; - - assert( hwParams ); - - err = alsa_snd_pcm_hw_params_get_rate_numden( hwParams, &num, &den ); - *sampleRate = (double) num / den; - - return err; -} - -/* Utility functions for blocking/callback interfaces */ - -/* Atomic restart of stream (we don't want the intermediate state visible) */ -static PaError AlsaRestart( PaAlsaStream *stream ) -{ - PaError result = paNoError; - - PA_ENSURE( PaUnixMutex_Lock( &stream->stateMtx ) ); - PA_ENSURE( AlsaStop( stream, 0 ) ); - PA_ENSURE( AlsaStart( stream, 0 ) ); - - PA_DEBUG(( "%s: Restarted audio\n", __FUNCTION__ )); - -error: - PA_ENSURE( PaUnixMutex_Unlock( &stream->stateMtx ) ); - - return result; -} - -/** Recover from xrun state. - * - */ -static PaError PaAlsaStream_HandleXrun( PaAlsaStream *self ) -{ - PaError result = paNoError; - snd_pcm_status_t *st; - PaTime now = PaUtil_GetTime(); - snd_timestamp_t t; - int restartAlsa = 0; /* do not restart Alsa by default */ - - alsa_snd_pcm_status_alloca( &st ); - - if( self->playback.pcm ) - { - alsa_snd_pcm_status( self->playback.pcm, st ); - if( alsa_snd_pcm_status_get_state( st ) == SND_PCM_STATE_XRUN ) - { - alsa_snd_pcm_status_get_trigger_tstamp( st, &t ); - self->underrun = now * 1000 - ( (PaTime)t.tv_sec * 1000 + (PaTime)t.tv_usec / 1000 ); - - if( !self->playback.canMmap ) - { - if( alsa_snd_pcm_recover( self->playback.pcm, -EPIPE, 0 ) < 0 ) - { - PA_DEBUG(( "%s: [playback] non-MMAP-PCM failed recovering from XRUN, will restart Alsa\n", __FUNCTION__ )); - ++ restartAlsa; /* did not manage to recover */ - } - } - else - ++ restartAlsa; /* always restart MMAPed device */ - } - } - if( self->capture.pcm ) - { - alsa_snd_pcm_status( self->capture.pcm, st ); - if( alsa_snd_pcm_status_get_state( st ) == SND_PCM_STATE_XRUN ) - { - alsa_snd_pcm_status_get_trigger_tstamp( st, &t ); - self->overrun = now * 1000 - ((PaTime) t.tv_sec * 1000 + (PaTime) t.tv_usec / 1000); - - if (!self->capture.canMmap) - { - if (alsa_snd_pcm_recover( self->capture.pcm, -EPIPE, 0 ) < 0) - { - PA_DEBUG(( "%s: [capture] non-MMAP-PCM failed recovering from XRUN, will restart Alsa\n", __FUNCTION__ )); - ++ restartAlsa; /* did not manage to recover */ - } - } - else - ++ restartAlsa; /* always restart MMAPed device */ - } - } - - if( restartAlsa ) - { - PA_DEBUG(( "%s: restarting Alsa to recover from XRUN\n", __FUNCTION__ )); - PA_ENSURE( AlsaRestart( self ) ); - } - -end: - return result; -error: - goto end; -} - -/** Decide if we should continue polling for specified direction, eventually adjust the poll timeout. - * - */ -static PaError ContinuePoll( const PaAlsaStream *stream, StreamDirection streamDir, int *pollTimeout, int *continuePoll ) -{ - PaError result = paNoError; - snd_pcm_sframes_t delay, margin; - int err; - const PaAlsaStreamComponent *component = NULL, *otherComponent = NULL; - - *continuePoll = 1; - - if( StreamDirection_In == streamDir ) - { - component = &stream->capture; - otherComponent = &stream->playback; - } - else - { - component = &stream->playback; - otherComponent = &stream->capture; - } - - /* ALSA docs say that negative delay should indicate xrun, but in my experience alsa_snd_pcm_delay returns -EPIPE */ - if( ( err = alsa_snd_pcm_delay( otherComponent->pcm, &delay ) ) < 0 ) - { - if( err == -EPIPE ) - { - /* Xrun */ - *continuePoll = 0; - goto error; - } - - ENSURE_( err, paUnanticipatedHostError ); - } - - if( StreamDirection_Out == streamDir ) - { - /* Number of eligible frames before capture overrun */ - delay = otherComponent->alsaBufferSize - delay; - } - margin = delay - otherComponent->framesPerPeriod / 2; - - if( margin < 0 ) - { - PA_DEBUG(( "%s: Stopping poll for %s\n", __FUNCTION__, StreamDirection_In == streamDir ? "capture" : "playback" )); - *continuePoll = 0; - } - else if( margin < otherComponent->framesPerPeriod ) - { - *pollTimeout = CalculatePollTimeout( stream, margin ); - PA_DEBUG(( "%s: Trying to poll again for %s frames, pollTimeout: %d\n", - __FUNCTION__, StreamDirection_In == streamDir ? "capture" : "playback", *pollTimeout )); - } - -error: - return result; -} - -/* Callback interface */ - -static void OnExit( void *data ) -{ - PaAlsaStream *stream = (PaAlsaStream *) data; - - assert( data ); - - PaUtil_ResetCpuLoadMeasurer( &stream->cpuLoadMeasurer ); - - stream->callback_finished = 1; /* Let the outside world know stream was stopped in callback */ - PA_DEBUG(( "%s: Stopping ALSA handles\n", __FUNCTION__ )); - AlsaStop( stream, stream->callbackAbort ); - - PA_DEBUG(( "%s: Stoppage\n", __FUNCTION__ )); - - /* Eventually notify user all buffers have played */ - if( stream->streamRepresentation.streamFinishedCallback ) - { - stream->streamRepresentation.streamFinishedCallback( stream->streamRepresentation.userData ); - } - stream->isActive = 0; -} - -static void CalculateTimeInfo( PaAlsaStream *stream, PaStreamCallbackTimeInfo *timeInfo ) -{ - snd_pcm_status_t *capture_status, *playback_status; - snd_timestamp_t capture_timestamp, playback_timestamp; - PaTime capture_time = 0., playback_time = 0.; - - alsa_snd_pcm_status_alloca( &capture_status ); - alsa_snd_pcm_status_alloca( &playback_status ); - - if( stream->capture.pcm ) - { - snd_pcm_sframes_t capture_delay; - - alsa_snd_pcm_status( stream->capture.pcm, capture_status ); - alsa_snd_pcm_status_get_tstamp( capture_status, &capture_timestamp ); - - capture_time = capture_timestamp.tv_sec + - ( (PaTime)capture_timestamp.tv_usec / 1000000.0 ); - timeInfo->currentTime = capture_time; - - capture_delay = alsa_snd_pcm_status_get_delay( capture_status ); - timeInfo->inputBufferAdcTime = timeInfo->currentTime - - (PaTime)capture_delay / stream->streamRepresentation.streamInfo.sampleRate; - } - if( stream->playback.pcm ) - { - snd_pcm_sframes_t playback_delay; - - alsa_snd_pcm_status( stream->playback.pcm, playback_status ); - alsa_snd_pcm_status_get_tstamp( playback_status, &playback_timestamp ); - - playback_time = playback_timestamp.tv_sec + - ((PaTime)playback_timestamp.tv_usec / 1000000.0); - - if( stream->capture.pcm ) /* Full duplex */ - { - /* Hmm, we have both a playback and a capture timestamp. - * Hopefully they are the same... */ - if( fabs( capture_time - playback_time ) > 0.01 ) - PA_DEBUG(( "Capture time and playback time differ by %f\n", fabs( capture_time-playback_time ) )); - } - else - timeInfo->currentTime = playback_time; - - playback_delay = alsa_snd_pcm_status_get_delay( playback_status ); - timeInfo->outputBufferDacTime = timeInfo->currentTime + - (PaTime)playback_delay / stream->streamRepresentation.streamInfo.sampleRate; - } -} - -/** Called after buffer processing is finished. - * - * A number of mmapped frames is committed, it is possible that an xrun has occurred in the meantime. - * - * @param numFrames The number of frames that has been processed - * @param xrun Return whether an xrun has occurred - */ -static PaError PaAlsaStreamComponent_EndProcessing( PaAlsaStreamComponent *self, unsigned long numFrames, int *xrun ) -{ - PaError result = paNoError; - int res = 0; - - /* @concern FullDuplex It is possible that only one direction is marked ready after polling, and processed - * afterwards - */ - if( !self->ready ) - goto end; - - if( !self->canMmap && StreamDirection_Out == self->streamDir ) - { - /* Play sound */ - if( self->hostInterleaved ) - res = alsa_snd_pcm_writei( self->pcm, self->nonMmapBuffer, numFrames ); - else - { - void *bufs[self->numHostChannels]; - int bufsize = alsa_snd_pcm_format_size( self->nativeFormat, self->framesPerPeriod + 1 ); - unsigned char *buffer = self->nonMmapBuffer; - int i; - for( i = 0; i < self->numHostChannels; ++i ) - { - bufs[i] = buffer; - buffer += bufsize; - } - res = alsa_snd_pcm_writen( self->pcm, bufs, numFrames ); - } - } - - if( self->canMmap ) - res = alsa_snd_pcm_mmap_commit( self->pcm, self->offset, numFrames ); - - if( res == -EPIPE || res == -ESTRPIPE ) - { - *xrun = 1; - } - else - { - ENSURE_( res, paUnanticipatedHostError ); - } - -end: -error: - return result; -} - -/* Extract buffer from channel area */ -static unsigned char *ExtractAddress( const snd_pcm_channel_area_t *area, snd_pcm_uframes_t offset ) -{ - return (unsigned char *) area->addr + ( area->first + offset * area->step ) / 8; -} - -/** Do necessary adaption between user and host channels. - * - @concern ChannelAdaption Adapting between user and host channels can involve silencing unused channels and - duplicating mono information if host outputs come in pairs. - */ -static PaError PaAlsaStreamComponent_DoChannelAdaption( PaAlsaStreamComponent *self, PaUtilBufferProcessor *bp, int numFrames ) -{ - PaError result = paNoError; - unsigned char *p; - int i; - int unusedChans = self->numHostChannels - self->numUserChannels; - unsigned char *src, *dst; - int convertMono = ( self->numHostChannels % 2 ) == 0 && ( self->numUserChannels % 2 ) != 0; - - assert( StreamDirection_Out == self->streamDir ); - - if( self->hostInterleaved ) - { - int swidth = alsa_snd_pcm_format_size( self->nativeFormat, 1 ); - unsigned char *buffer = self->canMmap ? ExtractAddress( self->channelAreas, self->offset ) : self->nonMmapBuffer; - - /* Start after the last user channel */ - p = buffer + self->numUserChannels * swidth; - - if( convertMono ) - { - /* Convert the last user channel into stereo pair */ - src = buffer + ( self->numUserChannels - 1 ) * swidth; - for( i = 0; i < numFrames; ++i ) - { - dst = src + swidth; - memcpy( dst, src, swidth ); - src += self->numHostChannels * swidth; - } - - /* Don't touch the channel we just wrote to */ - p += swidth; - --unusedChans; - } - - if( unusedChans > 0 ) - { - /* Silence unused output channels */ - for( i = 0; i < numFrames; ++i ) - { - memset( p, 0, swidth * unusedChans ); - p += self->numHostChannels * swidth; - } - } - } - else - { - /* We extract the last user channel */ - if( convertMono ) - { - ENSURE_( alsa_snd_pcm_area_copy( self->channelAreas + self->numUserChannels, self->offset, self->channelAreas + - ( self->numUserChannels - 1 ), self->offset, numFrames, self->nativeFormat ), paUnanticipatedHostError ); - --unusedChans; - } - if( unusedChans > 0 ) - { - alsa_snd_pcm_areas_silence( self->channelAreas + ( self->numHostChannels - unusedChans ), self->offset, unusedChans, numFrames, - self->nativeFormat ); - } - } - -error: - return result; -} - -static PaError PaAlsaStream_EndProcessing( PaAlsaStream *self, unsigned long numFrames, int *xrunOccurred ) -{ - PaError result = paNoError; - int xrun = 0; - - if( self->capture.pcm ) - { - PA_ENSURE( PaAlsaStreamComponent_EndProcessing( &self->capture, numFrames, &xrun ) ); - } - if( self->playback.pcm ) - { - if( self->playback.numHostChannels > self->playback.numUserChannels ) - { - PA_ENSURE( PaAlsaStreamComponent_DoChannelAdaption( &self->playback, &self->bufferProcessor, numFrames ) ); - } - PA_ENSURE( PaAlsaStreamComponent_EndProcessing( &self->playback, numFrames, &xrun ) ); - } - -error: - *xrunOccurred = xrun; - return result; -} - -/** Update the number of available frames. - * - */ -static PaError PaAlsaStreamComponent_GetAvailableFrames( PaAlsaStreamComponent *self, unsigned long *numFrames, int *xrunOccurred ) -{ - PaError result = paNoError; - snd_pcm_sframes_t framesAvail = alsa_snd_pcm_avail_update( self->pcm ); - *xrunOccurred = 0; - - if( -EPIPE == framesAvail ) - { - *xrunOccurred = 1; - framesAvail = 0; - } - else - { - ENSURE_( framesAvail, paUnanticipatedHostError ); - } - - *numFrames = framesAvail; - -error: - return result; -} - -/** Fill in pollfd objects. - */ -static PaError PaAlsaStreamComponent_BeginPolling( PaAlsaStreamComponent* self, struct pollfd* pfds ) -{ - int nfds = alsa_snd_pcm_poll_descriptors( self->pcm, pfds, self->nfds ); - /* If alsa returns anything else, like -EPIPE return */ - if( nfds != self->nfds ) - { - return paUnanticipatedHostError; - } - self->ready = 0; - - return paNoError; -} - -/** Examine results from poll(). - * - * @param pfds pollfds to inspect - * @param shouldPoll Should we continue to poll - * @param xrun Has an xrun occurred - */ -static PaError PaAlsaStreamComponent_EndPolling( PaAlsaStreamComponent* self, struct pollfd* pfds, int* shouldPoll, int* xrun ) -{ - PaError result = paNoError; - unsigned short revents; - - ENSURE_( alsa_snd_pcm_poll_descriptors_revents( self->pcm, pfds, self->nfds, &revents ), paUnanticipatedHostError ); - if( revents != 0 ) - { - if( revents & POLLERR ) - { - *xrun = 1; - } - else if( revents & POLLHUP ) - { - *xrun = 1; - PA_DEBUG(( "%s: revents has POLLHUP, processing as XRUN\n", __FUNCTION__ )); - } - else - self->ready = 1; - - *shouldPoll = 0; - } - else /* (A zero revent occurred) */ - /* Work around an issue with Alsa older than 1.0.16 using some plugins (eg default with plug + dmix) where - * POLLIN or POLLOUT are zeroed by Alsa-lib if _mmap_avail() is a few frames short of avail_min at period - * boundary, possibly due to erratic dma interrupts at period boundary? Treat as a valid event. - */ - if( self->useReventFix ) - { - self->ready = 1; - *shouldPoll = 0; - } - -error: - return result; -} - -/** Return the number of available frames for this stream. - * - * @concern FullDuplex The minimum available for the two directions is calculated, it might be desirable to ignore - * one direction however (not marked ready from poll), so this is controlled by queryCapture and queryPlayback. - * - * @param queryCapture Check available for capture - * @param queryPlayback Check available for playback - * @param available The returned number of frames - * @param xrunOccurred Return whether an xrun has occurred - */ -static PaError PaAlsaStream_GetAvailableFrames( PaAlsaStream *self, int queryCapture, int queryPlayback, unsigned long - *available, int *xrunOccurred ) -{ - PaError result = paNoError; - unsigned long captureFrames, playbackFrames; - *xrunOccurred = 0; - - assert( queryCapture || queryPlayback ); - - if( queryCapture ) - { - assert( self->capture.pcm ); - PA_ENSURE( PaAlsaStreamComponent_GetAvailableFrames( &self->capture, &captureFrames, xrunOccurred ) ); - if( *xrunOccurred ) - { - goto end; - } - } - if( queryPlayback ) - { - assert( self->playback.pcm ); - PA_ENSURE( PaAlsaStreamComponent_GetAvailableFrames( &self->playback, &playbackFrames, xrunOccurred ) ); - if( *xrunOccurred ) - { - goto end; - } - } - - if( queryCapture && queryPlayback ) - { - *available = PA_MIN( captureFrames, playbackFrames ); - /*PA_DEBUG(("capture: %lu, playback: %lu, combined: %lu\n", captureFrames, playbackFrames, *available));*/ - } - else if( queryCapture ) - { - *available = captureFrames; - } - else - { - *available = playbackFrames; - } - -end: -error: - return result; -} - -/** Wait for and report available buffer space from ALSA. - * - * Unless ALSA reports a minimum of frames available for I/O, we poll the ALSA filedescriptors for more. - * Both of these operations can uncover xrun conditions. - * - * @concern Xruns Both polling and querying available frames can report an xrun condition. - * - * @param framesAvail Return the number of available frames - * @param xrunOccurred Return whether an xrun has occurred - */ -static PaError PaAlsaStream_WaitForFrames( PaAlsaStream *self, unsigned long *framesAvail, int *xrunOccurred ) -{ - PaError result = paNoError; - int pollPlayback = self->playback.pcm != NULL, pollCapture = self->capture.pcm != NULL; - int pollTimeout = self->pollTimeout; - int xrun = 0, timeouts = 0; - int pollResults; - - assert( self ); - assert( framesAvail ); - - if( !self->callbackMode ) - { - /* In blocking mode we will only wait if necessary */ - PA_ENSURE( PaAlsaStream_GetAvailableFrames( self, self->capture.pcm != NULL, self->playback.pcm != NULL, - framesAvail, &xrun ) ); - if( xrun ) - { - goto end; - } - - if( *framesAvail > 0 ) - { - /* Mark pcms ready from poll */ - if( self->capture.pcm ) - self->capture.ready = 1; - if( self->playback.pcm ) - self->playback.ready = 1; - - goto end; - } - } - - while( pollPlayback || pollCapture ) - { - int totalFds = 0; - struct pollfd *capturePfds = NULL, *playbackPfds = NULL; - -#ifdef PTHREAD_CANCELED - pthread_testcancel(); -#endif - if( pollCapture ) - { - capturePfds = self->pfds; - PaError res = PaAlsaStreamComponent_BeginPolling( &self->capture, capturePfds ); - if( res != paNoError) - { - xrun = 1; - goto end; - } - totalFds += self->capture.nfds; - } - if( pollPlayback ) - { - /* self->pfds is in effect an array of fds; if necessary, index past the capture fds */ - playbackPfds = self->pfds + (pollCapture ? self->capture.nfds : 0); - PaError res = PaAlsaStreamComponent_BeginPolling( &self->playback, playbackPfds ); - if( res != paNoError) - { - xrun = 1; - goto end; - } - totalFds += self->playback.nfds; - } - -#ifdef PTHREAD_CANCELED - if( self->callbackMode ) - { - /* To allow 'Abort' to terminate the callback thread, enable cancelability just for poll() (& disable after) */ - pthread_setcancelstate( PTHREAD_CANCEL_ENABLE, NULL ); - } -#endif - - pollResults = poll( self->pfds, totalFds, pollTimeout ); - -#ifdef PTHREAD_CANCELED - if( self->callbackMode ) - { - pthread_setcancelstate( PTHREAD_CANCEL_DISABLE, NULL ); - } -#endif - - if( pollResults < 0 ) - { - /* XXX: Depend on preprocessor condition? */ - if( errno == EINTR ) - { - /* gdb */ - Pa_Sleep( 1 ); /* avoid hot loop */ - continue; - } - - /* TODO: Add macro for checking system calls */ - PA_ENSURE( paInternalError ); - } - else if( pollResults == 0 ) - { - /* Suspended, paused or failed device can provide 0 poll results. To avoid deadloop in such situation - * we simply run counter 'timeouts' which detects 0 poll result and accumulates. As soon as 2048 timouts (around 2 seconds) - * are achieved we simply fail function with paTimedOut to notify waiting methods that device is not capable - * of providing audio data anymore and needs some corresponding recovery action. - * Note that 'timeouts' is reset to 0 if poll() managed to return non 0 results. - */ - - /*PA_DEBUG(( "%s: poll == 0 results, timed out, %d times left\n", __FUNCTION__, 2048 - timeouts ));*/ - ++ timeouts; - if( timeouts > 1 ) /* sometimes device times out, but normally once, so we do not sleep any time */ - { - Pa_Sleep( 1 ); /* avoid hot loop */ - } - /* not else ! */ - if( timeouts >= 2048 ) /* audio device not working, shall return error to notify waiters */ - { - *framesAvail = 0; /* no frames available for processing */ - xrun = 1; /* try recovering device */ - - PA_DEBUG(( "%s: poll timed out\n", __FUNCTION__, timeouts )); - goto end;/*PA_ENSURE( paTimedOut );*/ - } - } - else if( pollResults > 0 ) - { - /* reset timouts counter */ - timeouts = 0; - - /* check the return status of our pfds */ - if( pollCapture ) - { - PA_ENSURE( PaAlsaStreamComponent_EndPolling( &self->capture, capturePfds, &pollCapture, &xrun ) ); - } - if( pollPlayback ) - { - PA_ENSURE( PaAlsaStreamComponent_EndPolling( &self->playback, playbackPfds, &pollPlayback, &xrun ) ); - } - if( xrun ) - { - break; - } - } - - /* @concern FullDuplex If only one of two pcms is ready we may want to compromise between the two. - * If there is less than half a period's worth of samples left of frames in the other pcm's buffer we will - * stop polling. - */ - if( self->capture.pcm && self->playback.pcm ) - { - if( pollCapture && !pollPlayback ) - { - PA_ENSURE( ContinuePoll( self, StreamDirection_In, &pollTimeout, &pollCapture ) ); - } - else if( pollPlayback && !pollCapture ) - { - PA_ENSURE( ContinuePoll( self, StreamDirection_Out, &pollTimeout, &pollPlayback ) ); - } - } - } - - if( !xrun ) - { - /* Get the number of available frames for the pcms that are marked ready. - * @concern FullDuplex If only one direction is marked ready (from poll), the number of frames available for - * the other direction is returned. Output is normally preferred over capture however, so capture frames may be - * discarded to avoid overrun unless paNeverDropInput is specified. - */ - int captureReady = self->capture.pcm ? self->capture.ready : 0, - playbackReady = self->playback.pcm ? self->playback.ready : 0; - PA_ENSURE( PaAlsaStream_GetAvailableFrames( self, captureReady, playbackReady, framesAvail, &xrun ) ); - - if( self->capture.pcm && self->playback.pcm ) - { - if( !self->playback.ready && !self->neverDropInput ) - { - /* Drop input, a period's worth */ - assert( self->capture.ready ); - PaAlsaStreamComponent_EndProcessing( &self->capture, PA_MIN( self->capture.framesPerPeriod, - *framesAvail ), &xrun ); - *framesAvail = 0; - self->capture.ready = 0; - } - } - else if( self->capture.pcm ) - assert( self->capture.ready ); - else - assert( self->playback.ready ); - } - -end: -error: - if( xrun ) - { - /* Recover from the xrun state */ - PA_ENSURE( PaAlsaStream_HandleXrun( self ) ); - *framesAvail = 0; - } - else - { - if( 0 != *framesAvail ) - { - /* If we're reporting frames eligible for processing, one of the handles better be ready */ - PA_UNLESS( self->capture.ready || self->playback.ready, paInternalError ); - } - } - *xrunOccurred = xrun; - - return result; -} - -/** Register per-channel ALSA buffer information with buffer processor. - * - * Mmapped buffer space is acquired from ALSA, and registered with the buffer processor. Differences between the - * number of host and user channels is taken into account. - * - * @param numFrames On entrance the number of requested frames, on exit the number of contiguously accessible frames. - */ -static PaError PaAlsaStreamComponent_RegisterChannels( PaAlsaStreamComponent* self, PaUtilBufferProcessor* bp, - unsigned long* numFrames, int* xrun ) -{ - PaError result = paNoError; - const snd_pcm_channel_area_t *areas, *area; - void (*setChannel)(PaUtilBufferProcessor *, unsigned int, void *, unsigned int) = - StreamDirection_In == self->streamDir ? PaUtil_SetInputChannel : PaUtil_SetOutputChannel; - unsigned char *buffer, *p; - int i; - unsigned long framesAvail; - - /* This _must_ be called before mmap_begin */ - PA_ENSURE( PaAlsaStreamComponent_GetAvailableFrames( self, &framesAvail, xrun ) ); - if( *xrun ) - { - *numFrames = 0; - goto end; - } - - if( self->canMmap ) - { - ENSURE_( alsa_snd_pcm_mmap_begin( self->pcm, &areas, &self->offset, numFrames ), paUnanticipatedHostError ); - /* @concern ChannelAdaption Buffer address is recorded so we can do some channel adaption later */ - self->channelAreas = (snd_pcm_channel_area_t *)areas; - } - else - { - unsigned int bufferSize = self->numHostChannels * alsa_snd_pcm_format_size( self->nativeFormat, *numFrames ); - if( bufferSize > self->nonMmapBufferSize ) - { - self->nonMmapBuffer = realloc( self->nonMmapBuffer, ( self->nonMmapBufferSize = bufferSize ) ); - if( !self->nonMmapBuffer ) - { - result = paInsufficientMemory; - goto error; - } - } - } - - if( self->hostInterleaved ) - { - int swidth = alsa_snd_pcm_format_size( self->nativeFormat, 1 ); - - p = buffer = self->canMmap ? ExtractAddress( areas, self->offset ) : self->nonMmapBuffer; - for( i = 0; i < self->numUserChannels; ++i ) - { - /* We're setting the channels up to userChannels, but the stride will be hostChannels samples */ - setChannel( bp, i, p, self->numHostChannels ); - p += swidth; - } - } - else - { - if( self->canMmap ) - { - for( i = 0; i < self->numUserChannels; ++i ) - { - area = areas + i; - buffer = ExtractAddress( area, self->offset ); - setChannel( bp, i, buffer, 1 ); - } - } - else - { - unsigned int buf_per_ch_size = self->nonMmapBufferSize / self->numHostChannels; - buffer = self->nonMmapBuffer; - for( i = 0; i < self->numUserChannels; ++i ) - { - setChannel( bp, i, buffer, 1 ); - buffer += buf_per_ch_size; - } - } - } - - if( !self->canMmap && StreamDirection_In == self->streamDir ) - { - /* Read sound */ - int res; - if( self->hostInterleaved ) - res = alsa_snd_pcm_readi( self->pcm, self->nonMmapBuffer, *numFrames ); - else - { - void *bufs[self->numHostChannels]; - unsigned int buf_per_ch_size = self->nonMmapBufferSize / self->numHostChannels; - unsigned char *buffer = self->nonMmapBuffer; - int i; - for( i = 0; i < self->numHostChannels; ++i ) - { - bufs[i] = buffer; - buffer += buf_per_ch_size; - } - res = alsa_snd_pcm_readn( self->pcm, bufs, *numFrames ); - } - if( res == -EPIPE || res == -ESTRPIPE ) - { - *xrun = 1; - *numFrames = 0; - } - } - -end: -error: - return result; -} - -/** Initiate buffer processing. - * - * ALSA buffers are registered with the PA buffer processor and the buffer size (in frames) set. - * - * @concern FullDuplex If both directions are being processed, the minimum amount of frames for the two directions is - * calculated. - * - * @param numFrames On entrance the number of available frames, on exit the number of received frames - * @param xrunOccurred Return whether an xrun has occurred - */ -static PaError PaAlsaStream_SetUpBuffers( PaAlsaStream* self, unsigned long* numFrames, int* xrunOccurred ) -{ - PaError result = paNoError; - unsigned long captureFrames = ULONG_MAX, playbackFrames = ULONG_MAX, commonFrames = 0; - int xrun = 0; - - if( *xrunOccurred ) - { - *numFrames = 0; - return result; - } - /* If we got here at least one of the pcm's should be marked ready */ - PA_UNLESS( self->capture.ready || self->playback.ready, paInternalError ); - - /* Extract per-channel ALSA buffer pointers and register them with the buffer processor. - * It is possible that a direction is not marked ready however, because it is out of sync with the other. - */ - if( self->capture.pcm && self->capture.ready ) - { - captureFrames = *numFrames; - PA_ENSURE( PaAlsaStreamComponent_RegisterChannels( &self->capture, &self->bufferProcessor, &captureFrames, - &xrun ) ); - } - if( self->playback.pcm && self->playback.ready ) - { - playbackFrames = *numFrames; - PA_ENSURE( PaAlsaStreamComponent_RegisterChannels( &self->playback, &self->bufferProcessor, &playbackFrames, - &xrun ) ); - } - if( xrun ) - { - /* Nothing more to do */ - assert( 0 == commonFrames ); - goto end; - } - - commonFrames = PA_MIN( captureFrames, playbackFrames ); - /* assert( commonFrames <= *numFrames ); */ - if( commonFrames > *numFrames ) - { - /* Hmmm ... how come there are more frames available than we requested!? Blah. */ - PA_DEBUG(( "%s: Common available frames are reported to be more than number requested: %lu, %lu, callbackMode: %d\n", __FUNCTION__, - commonFrames, *numFrames, self->callbackMode )); - if( self->capture.pcm ) - { - PA_DEBUG(( "%s: captureFrames: %lu, capture.ready: %d\n", __FUNCTION__, captureFrames, self->capture.ready )); - } - if( self->playback.pcm ) - { - PA_DEBUG(( "%s: playbackFrames: %lu, playback.ready: %d\n", __FUNCTION__, playbackFrames, self->playback.ready )); - } - - commonFrames = 0; - goto end; - } - - /* Inform PortAudio of the number of frames we got. - * @concern FullDuplex We might be experiencing underflow in either end; if its an input underflow, we go on - * with output. If its output underflow however, depending on the paNeverDropInput flag, we may want to simply - * discard the excess input or call the callback with paOutputOverflow flagged. - */ - if( self->capture.pcm ) - { - if( self->capture.ready ) - { - PaUtil_SetInputFrameCount( &self->bufferProcessor, commonFrames ); - } - else - { - /* We have input underflow */ - PaUtil_SetNoInput( &self->bufferProcessor ); - } - } - if( self->playback.pcm ) - { - if( self->playback.ready ) - { - PaUtil_SetOutputFrameCount( &self->bufferProcessor, commonFrames ); - } - else - { - /* We have output underflow, but keeping input data (paNeverDropInput) */ - assert( self->neverDropInput ); - assert( self->capture.pcm != NULL ); - PA_DEBUG(( "%s: Setting output buffers to NULL\n", __FUNCTION__ )); - PaUtil_SetNoOutput( &self->bufferProcessor ); - } - } - -end: - *numFrames = commonFrames; -error: - if( xrun ) - { - PA_ENSURE( PaAlsaStream_HandleXrun( self ) ); - *numFrames = 0; - } - *xrunOccurred = xrun; - - return result; -} - -/** Callback thread's function. - * - * Roughly, the workflow can be described in the following way: The number of available frames that can be processed - * directly is obtained from ALSA, we then request as much directly accessible memory as possible within this amount - * from ALSA. The buffer memory is registered with the PA buffer processor and processing is carried out with - * PaUtil_EndBufferProcessing. Finally, the number of processed frames is reported to ALSA. The processing can - * happen in several iterations until we have consumed the known number of available frames (or an xrun is detected). - */ -static void *CallbackThreadFunc( void *userData ) -{ - PaError result = paNoError; - PaAlsaStream *stream = (PaAlsaStream*) userData; - PaStreamCallbackTimeInfo timeInfo = {0, 0, 0}; - snd_pcm_sframes_t startThreshold = 0; - int callbackResult = paContinue; - PaStreamCallbackFlags cbFlags = 0; /* We might want to keep state across iterations */ - int streamStarted = 0; - - assert( stream ); - /* Not implemented */ - assert( !stream->primeBuffers ); - - /* Execute OnExit when exiting */ - pthread_cleanup_push( &OnExit, stream ); -#ifdef PTHREAD_CANCELED - /* 'Abort' will use thread cancellation to terminate the callback thread, but the Alsa-lib functions - * are NOT cancel-safe, (and can end up in an inconsistent state). So, disable cancelability for - * the thread here, and just re-enable it for the poll() in PaAlsaStream_WaitForFrames(). */ - pthread_testcancel(); - pthread_setcancelstate( PTHREAD_CANCEL_DISABLE, NULL ); -#endif - - /* @concern StreamStart If the output is being primed the output pcm needs to be prepared, otherwise the - * stream is started immediately. The latter involves signaling the waiting main thread. - */ - if( stream->primeBuffers ) - { - snd_pcm_sframes_t avail; - - if( stream->playback.pcm ) - ENSURE_( alsa_snd_pcm_prepare( stream->playback.pcm ), paUnanticipatedHostError ); - if( stream->capture.pcm && !stream->pcmsSynced ) - ENSURE_( alsa_snd_pcm_prepare( stream->capture.pcm ), paUnanticipatedHostError ); - - /* We can't be certain that the whole ring buffer is available for priming, but there should be - * at least one period */ - avail = alsa_snd_pcm_avail_update( stream->playback.pcm ); - startThreshold = avail - (avail % stream->playback.framesPerPeriod); - assert( startThreshold >= stream->playback.framesPerPeriod ); - } - else - { - PA_ENSURE( PaUnixThread_PrepareNotify( &stream->thread ) ); - /* Buffer will be zeroed */ - PA_ENSURE( AlsaStart( stream, 0 ) ); - PA_ENSURE( PaUnixThread_NotifyParent( &stream->thread ) ); - - streamStarted = 1; - } - - while( 1 ) - { - unsigned long framesAvail, framesGot; - int xrun = 0; - -#ifdef PTHREAD_CANCELED - pthread_testcancel(); -#endif - - /* @concern StreamStop if the main thread has requested a stop and the stream has not been effectively - * stopped we signal this condition by modifying callbackResult (we'll want to flush buffered output). - */ - if( PaUnixThread_StopRequested( &stream->thread ) && paContinue == callbackResult ) - { - PA_DEBUG(( "Setting callbackResult to paComplete\n" )); - callbackResult = paComplete; - } - - if( paContinue != callbackResult ) - { - stream->callbackAbort = ( paAbort == callbackResult ); - if( stream->callbackAbort || - /** @concern BlockAdaption: Go on if adaption buffers are empty */ - PaUtil_IsBufferProcessorOutputEmpty( &stream->bufferProcessor ) ) - { - goto end; - } - - PA_DEBUG(( "%s: Flushing buffer processor\n", __FUNCTION__ )); - /* There is still buffered output that needs to be processed */ - } - - /* Wait for data to become available, this comes down to polling the ALSA file descriptors until we have - * a number of available frames. - */ - PA_ENSURE( PaAlsaStream_WaitForFrames( stream, &framesAvail, &xrun ) ); - if( xrun ) - { - assert( 0 == framesAvail ); - continue; - - /* XXX: Report xruns to the user? A situation is conceivable where the callback is never invoked due - * to constant xruns, it might be desirable to notify the user of this. - */ - } - - /* Consume buffer space. Once we have a number of frames available for consumption we must retrieve the - * mmapped buffers from ALSA, this is contiguously accessible memory however, so we may receive smaller - * portions at a time than is available as a whole. Therefore we should be prepared to process several - * chunks successively. The buffers are passed to the PA buffer processor. - */ - while( framesAvail > 0 ) - { - xrun = 0; - - /** @concern Xruns Under/overflows are to be reported to the callback */ - if( stream->underrun > 0.0 ) - { - cbFlags |= paOutputUnderflow; - stream->underrun = 0.0; - } - if( stream->overrun > 0.0 ) - { - cbFlags |= paInputOverflow; - stream->overrun = 0.0; - } - if( stream->capture.pcm && stream->playback.pcm ) - { - /** @concern FullDuplex It's possible that only one direction is being processed to avoid an - * under- or overflow, this should be reported correspondingly */ - if( !stream->capture.ready ) - { - cbFlags |= paInputUnderflow; - PA_DEBUG(( "%s: Input underflow\n", __FUNCTION__ )); - } - else if( !stream->playback.ready ) - { - cbFlags |= paOutputOverflow; - PA_DEBUG(( "%s: Output overflow\n", __FUNCTION__ )); - } - } - -#if 0 - CallbackUpdate( &stream->threading ); -#endif - - CalculateTimeInfo( stream, &timeInfo ); - PaUtil_BeginBufferProcessing( &stream->bufferProcessor, &timeInfo, cbFlags ); - cbFlags = 0; - - /* CPU load measurement should include processing activity external to the stream callback */ - PaUtil_BeginCpuLoadMeasurement( &stream->cpuLoadMeasurer ); - - framesGot = framesAvail; - if( paUtilFixedHostBufferSize == stream->bufferProcessor.hostBufferSizeMode ) - { - /* We've committed to a fixed host buffer size, stick to that */ - framesGot = framesGot >= stream->maxFramesPerHostBuffer ? stream->maxFramesPerHostBuffer : 0; - } - else - { - /* We've committed to an upper bound on the size of host buffers */ - assert( paUtilBoundedHostBufferSize == stream->bufferProcessor.hostBufferSizeMode ); - framesGot = PA_MIN( framesGot, stream->maxFramesPerHostBuffer ); - } - PA_ENSURE( PaAlsaStream_SetUpBuffers( stream, &framesGot, &xrun ) ); - /* Check the host buffer size against the buffer processor configuration */ - framesAvail -= framesGot; - - if( framesGot > 0 ) - { - assert( !xrun ); - PaUtil_EndBufferProcessing( &stream->bufferProcessor, &callbackResult ); - PA_ENSURE( PaAlsaStream_EndProcessing( stream, framesGot, &xrun ) ); - } - PaUtil_EndCpuLoadMeasurement( &stream->cpuLoadMeasurer, framesGot ); - - if( 0 == framesGot ) - { - /* Go back to polling for more frames */ - break; - } - - if( paContinue != callbackResult ) - break; - } - } - -end: - ; /* Hack to fix "label at end of compound statement" error caused by pthread_cleanup_pop(1) macro. */ - /* Match pthread_cleanup_push */ - pthread_cleanup_pop( 1 ); - - PA_DEBUG(( "%s: Thread %d exiting\n ", __FUNCTION__, pthread_self() )); - PaUnixThreading_EXIT( result ); - -error: - PA_DEBUG(( "%s: Thread %d is canceled due to error %d\n ", __FUNCTION__, pthread_self(), result )); - goto end; -} - -/* Blocking interface */ - -static PaError ReadStream( PaStream* s, void *buffer, unsigned long frames ) -{ - PaError result = paNoError; - PaAlsaStream *stream = (PaAlsaStream*)s; - unsigned long framesGot, framesAvail; - void *userBuffer; - snd_pcm_t *save = stream->playback.pcm; - - assert( stream ); - - PA_UNLESS( stream->capture.pcm, paCanNotReadFromAnOutputOnlyStream ); - - /* Disregard playback */ - stream->playback.pcm = NULL; - - if( stream->overrun > 0. ) - { - result = paInputOverflowed; - stream->overrun = 0.0; - } - - if( stream->capture.userInterleaved ) - { - userBuffer = buffer; - } - else - { - /* Copy channels into local array */ - userBuffer = stream->capture.userBuffers; - memcpy( userBuffer, buffer, sizeof (void *) * stream->capture.numUserChannels ); - } - - /* Start stream if in prepared state */ - if( alsa_snd_pcm_state( stream->capture.pcm ) == SND_PCM_STATE_PREPARED ) - { - ENSURE_( alsa_snd_pcm_start( stream->capture.pcm ), paUnanticipatedHostError ); - } - - while( frames > 0 ) - { - int xrun = 0; - PA_ENSURE( PaAlsaStream_WaitForFrames( stream, &framesAvail, &xrun ) ); - framesGot = PA_MIN( framesAvail, frames ); - - PA_ENSURE( PaAlsaStream_SetUpBuffers( stream, &framesGot, &xrun ) ); - if( framesGot > 0 ) - { - framesGot = PaUtil_CopyInput( &stream->bufferProcessor, &userBuffer, framesGot ); - PA_ENSURE( PaAlsaStream_EndProcessing( stream, framesGot, &xrun ) ); - frames -= framesGot; - } - } - -end: - stream->playback.pcm = save; - return result; -error: - goto end; -} - -static PaError WriteStream( PaStream* s, const void *buffer, unsigned long frames ) -{ - PaError result = paNoError; - signed long err; - PaAlsaStream *stream = (PaAlsaStream*)s; - snd_pcm_uframes_t framesGot, framesAvail; - const void *userBuffer; - snd_pcm_t *save = stream->capture.pcm; - - assert( stream ); - - PA_UNLESS( stream->playback.pcm, paCanNotWriteToAnInputOnlyStream ); - - /* Disregard capture */ - stream->capture.pcm = NULL; - - if( stream->underrun > 0. ) - { - result = paOutputUnderflowed; - stream->underrun = 0.0; - } - - if( stream->playback.userInterleaved ) - userBuffer = buffer; - else /* Copy channels into local array */ - { - userBuffer = stream->playback.userBuffers; - memcpy( (void *)userBuffer, buffer, sizeof (void *) * stream->playback.numUserChannels ); - } - - while( frames > 0 ) - { - int xrun = 0; - snd_pcm_uframes_t hwAvail; - - PA_ENSURE( PaAlsaStream_WaitForFrames( stream, &framesAvail, &xrun ) ); - framesGot = PA_MIN( framesAvail, frames ); - - PA_ENSURE( PaAlsaStream_SetUpBuffers( stream, &framesGot, &xrun ) ); - if( framesGot > 0 ) - { - framesGot = PaUtil_CopyOutput( &stream->bufferProcessor, &userBuffer, framesGot ); - PA_ENSURE( PaAlsaStream_EndProcessing( stream, framesGot, &xrun ) ); - frames -= framesGot; - } - - /* Start stream after one period of samples worth */ - - /* Frames residing in buffer */ - PA_ENSURE( err = GetStreamWriteAvailable( stream ) ); - framesAvail = err; - hwAvail = stream->playback.alsaBufferSize - framesAvail; - - if( alsa_snd_pcm_state( stream->playback.pcm ) == SND_PCM_STATE_PREPARED && - hwAvail >= stream->playback.framesPerPeriod ) - { - ENSURE_( alsa_snd_pcm_start( stream->playback.pcm ), paUnanticipatedHostError ); - } - } - -end: - stream->capture.pcm = save; - return result; -error: - goto end; -} - -/* Return frames available for reading. In the event of an overflow, the capture pcm will be restarted */ -static signed long GetStreamReadAvailable( PaStream* s ) -{ - PaError result = paNoError; - PaAlsaStream *stream = (PaAlsaStream*)s; - unsigned long avail; - int xrun; - - PA_ENSURE( PaAlsaStreamComponent_GetAvailableFrames( &stream->capture, &avail, &xrun ) ); - if( xrun ) - { - PA_ENSURE( PaAlsaStream_HandleXrun( stream ) ); - PA_ENSURE( PaAlsaStreamComponent_GetAvailableFrames( &stream->capture, &avail, &xrun ) ); - if( xrun ) - PA_ENSURE( paInputOverflowed ); - } - - return (signed long)avail; - -error: - return result; -} - -static signed long GetStreamWriteAvailable( PaStream* s ) -{ - PaError result = paNoError; - PaAlsaStream *stream = (PaAlsaStream*)s; - unsigned long avail; - int xrun; - - PA_ENSURE( PaAlsaStreamComponent_GetAvailableFrames( &stream->playback, &avail, &xrun ) ); - if( xrun ) - { - snd_pcm_sframes_t savail; - - PA_ENSURE( PaAlsaStream_HandleXrun( stream ) ); - savail = alsa_snd_pcm_avail_update( stream->playback.pcm ); - - /* savail should not contain -EPIPE now, since PaAlsaStream_HandleXrun will only prepare the pcm */ - ENSURE_( savail, paUnanticipatedHostError ); - - avail = (unsigned long) savail; - } - - return (signed long)avail; - -error: - return result; -} - -/* Extensions */ - -void PaAlsa_InitializeStreamInfo( PaAlsaStreamInfo *info ) -{ - info->size = sizeof (PaAlsaStreamInfo); - info->hostApiType = paALSA; - info->version = 1; - info->deviceString = NULL; -} - -void PaAlsa_EnableRealtimeScheduling( PaStream *s, int enable ) -{ - PaAlsaStream *stream = (PaAlsaStream *) s; - stream->rtSched = enable; -} - -#if 0 -void PaAlsa_EnableWatchdog( PaStream *s, int enable ) -{ - PaAlsaStream *stream = (PaAlsaStream *) s; - stream->thread.useWatchdog = enable; -} -#endif - -static PaError GetAlsaStreamPointer( PaStream* s, PaAlsaStream** stream ) -{ - PaError result = paNoError; - PaUtilHostApiRepresentation* hostApi; - PaAlsaHostApiRepresentation* alsaHostApi; - - PA_ENSURE( PaUtil_ValidateStreamPointer( s ) ); - PA_ENSURE( PaUtil_GetHostApiRepresentation( &hostApi, paALSA ) ); - alsaHostApi = (PaAlsaHostApiRepresentation*)hostApi; - - PA_UNLESS( PA_STREAM_REP( s )->streamInterface == &alsaHostApi->callbackStreamInterface - || PA_STREAM_REP( s )->streamInterface == &alsaHostApi->blockingStreamInterface, - paIncompatibleStreamHostApi ); - - *stream = (PaAlsaStream*)s; -error: - return paNoError; -} - -PaError PaAlsa_GetStreamInputCard( PaStream* s, int* card ) -{ - PaAlsaStream *stream; - PaError result = paNoError; - snd_pcm_info_t* pcmInfo; - - PA_ENSURE( GetAlsaStreamPointer( s, &stream ) ); - - /* XXX: More descriptive error? */ - PA_UNLESS( stream->capture.pcm, paDeviceUnavailable ); - - alsa_snd_pcm_info_alloca( &pcmInfo ); - PA_ENSURE( alsa_snd_pcm_info( stream->capture.pcm, pcmInfo ) ); - *card = alsa_snd_pcm_info_get_card( pcmInfo ); - -error: - return result; -} - -PaError PaAlsa_GetStreamOutputCard( PaStream* s, int* card ) -{ - PaAlsaStream *stream; - PaError result = paNoError; - snd_pcm_info_t* pcmInfo; - - PA_ENSURE( GetAlsaStreamPointer( s, &stream ) ); - - /* XXX: More descriptive error? */ - PA_UNLESS( stream->playback.pcm, paDeviceUnavailable ); - - alsa_snd_pcm_info_alloca( &pcmInfo ); - PA_ENSURE( alsa_snd_pcm_info( stream->playback.pcm, pcmInfo ) ); - *card = alsa_snd_pcm_info_get_card( pcmInfo ); - -error: - return result; -} - -PaError PaAlsa_SetRetriesBusy( int retries ) -{ - busyRetries_ = retries; - return paNoError; -} |