diff options
author | sanine <sanine.not@pm.me> | 2022-08-25 14:54:53 -0500 |
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committer | sanine <sanine.not@pm.me> | 2022-08-25 14:54:53 -0500 |
commit | 37c97e345d12f95dde44e1d1a4c2f2aadd4615bc (patch) | |
tree | e1bb25bc855883062bdd7847ff2c04290f71c840 /portaudio/examples/paex_wmme_ac3.c | |
parent | 5634c7b04da619669f2f29f6798c03982be05180 (diff) |
add initial structure
Diffstat (limited to 'portaudio/examples/paex_wmme_ac3.c')
-rw-r--r-- | portaudio/examples/paex_wmme_ac3.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/portaudio/examples/paex_wmme_ac3.c b/portaudio/examples/paex_wmme_ac3.c new file mode 100644 index 0000000..74daa96 --- /dev/null +++ b/portaudio/examples/paex_wmme_ac3.c @@ -0,0 +1,220 @@ +/** @file paex_wmme_ac3.c + @ingroup examples_src + @brief Use WMME-specific interface to send raw AC3 data to a S/PDIF output. + @author Ross Bencina <rossb@audiomulch.com> +*/ +/* + * $Id: $ + * Portable Audio I/O Library + * Windows MME ac3 sound output test + * + * Copyright (c) 2009 Ross Bencina + * + * 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. + */ + +#include <stdio.h> +#include <math.h> + +#include <windows.h> /* required when using pa_win_wmme.h */ +#include <mmsystem.h> /* required when using pa_win_wmme.h */ + +#include "portaudio.h" +#include "pa_win_wmme.h" + +#define NUM_SECONDS (20) +#define SAMPLE_RATE (48000) +#define FRAMES_PER_BUFFER (64) + +#ifndef M_PI +#define M_PI (3.14159265) +#endif + +#define TABLE_SIZE (100) + +#define CHANNEL_COUNT (2) + + + +typedef struct +{ + short *buffer; + int bufferSampleCount; + int playbackIndex; +} +paTestData; + +/* This routine will be called by the PortAudio engine when audio is needed. +** It may called at interrupt level on some machines so don't do anything +** that could mess up the system like calling malloc() or free(). +*/ +static int patestCallback( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void *userData ) +{ + paTestData *data = (paTestData*)userData; + short *out = (short*)outputBuffer; + unsigned long i,j; + + (void) timeInfo; /* Prevent unused variable warnings. */ + (void) statusFlags; + (void) inputBuffer; + + /* stream out contents of data->buffer looping at end */ + + for( i=0; i<framesPerBuffer; i++ ) + { + for( j = 0; j < CHANNEL_COUNT; ++j ){ + *out++ = data->buffer[ data->playbackIndex++ ]; + + if( data->playbackIndex >= data->bufferSampleCount ) + data->playbackIndex = 0; /* loop at end of buffer */ + } + } + + return paContinue; +} + +/*******************************************************************/ +int main(int argc, char* argv[]) +{ + PaStreamParameters outputParameters; + PaWinMmeStreamInfo wmmeStreamInfo; + PaStream *stream; + PaError err; + paTestData data; + int deviceIndex; + FILE *fp; + const char *fileName = "c:\\test_48k.ac3.spdif"; + data.buffer = NULL; + + printf("usage: patest_wmme_ac3 fileName [paDeviceIndex]\n"); + printf("**IMPORTANT*** The provided file must include the spdif preamble at the start of every AC-3 frame. Using a normal ac3 file won't work.\n"); + printf("PortAudio Test: output a raw spdif ac3 stream. SR = %d, BufSize = %d, Chans = %d\n", + SAMPLE_RATE, FRAMES_PER_BUFFER, CHANNEL_COUNT); + + + if( argc >= 2 ) + fileName = argv[1]; + + printf( "reading spdif ac3 raw stream file %s\n", fileName ); + + fp = fopen( fileName, "rb" ); + if( !fp ){ + fprintf( stderr, "error opening spdif ac3 file.\n" ); + return -1; + } + /* get file size */ + fseek( fp, 0, SEEK_END ); + data.bufferSampleCount = ftell( fp ) / sizeof(short); + fseek( fp, 0, SEEK_SET ); + + /* allocate buffer, read the whole file into memory */ + data.buffer = (short*)malloc( data.bufferSampleCount * sizeof(short) ); + if( !data.buffer ){ + fprintf( stderr, "error allocating buffer.\n" ); + return -1; + } + + fread( data.buffer, sizeof(short), data.bufferSampleCount, fp ); + fclose( fp ); + + data.playbackIndex = 0; + + err = Pa_Initialize(); + if( err != paNoError ) goto error; + + deviceIndex = Pa_GetHostApiInfo( Pa_HostApiTypeIdToHostApiIndex( paMME ) )->defaultOutputDevice; + if( argc >= 3 ){ + sscanf( argv[1], "%d", &deviceIndex ); + } + + printf( "using device id %d (%s)\n", deviceIndex, Pa_GetDeviceInfo(deviceIndex)->name ); + + + outputParameters.device = deviceIndex; + outputParameters.channelCount = CHANNEL_COUNT; + outputParameters.sampleFormat = paInt16; /* IMPORTANT must use paInt16 for WMME AC3 */ + outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; + outputParameters.hostApiSpecificStreamInfo = NULL; + + wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo); + wmmeStreamInfo.hostApiType = paMME; + wmmeStreamInfo.version = 1; + wmmeStreamInfo.flags = paWinMmeWaveFormatDolbyAc3Spdif; + outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo; + + + if( Pa_IsFormatSupported( 0, &outputParameters, SAMPLE_RATE ) == paFormatIsSupported ){ + printf( "Pa_IsFormatSupported reports device will support %d channels.\n", CHANNEL_COUNT ); + }else{ + printf( "Pa_IsFormatSupported reports device will not support %d channels.\n", CHANNEL_COUNT ); + } + + err = Pa_OpenStream( + &stream, + NULL, /* no input */ + &outputParameters, + SAMPLE_RATE, + FRAMES_PER_BUFFER, + 0, + patestCallback, + &data ); + if( err != paNoError ) goto error; + + err = Pa_StartStream( stream ); + if( err != paNoError ) goto error; + + printf("Play for %d seconds.\n", NUM_SECONDS ); + Pa_Sleep( NUM_SECONDS * 1000 ); + + err = Pa_StopStream( stream ); + if( err != paNoError ) goto error; + + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto error; + + Pa_Terminate(); + free( data.buffer ); + printf("Test finished.\n"); + + return err; +error: + Pa_Terminate(); + free( data.buffer ); + + fprintf( stderr, "An error occurred while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return err; +} |