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Diffstat (limited to '3rdparty/portaudio/examples/paex_sine_c++.cpp')
| -rw-r--r-- | 3rdparty/portaudio/examples/paex_sine_c++.cpp | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/3rdparty/portaudio/examples/paex_sine_c++.cpp b/3rdparty/portaudio/examples/paex_sine_c++.cpp new file mode 100644 index 0000000..5d96522 --- /dev/null +++ b/3rdparty/portaudio/examples/paex_sine_c++.cpp @@ -0,0 +1,275 @@ +/** @file paex_sine.c + @ingroup examples_src + @brief Play a sine wave for several seconds. + @author Ross Bencina <rossb@audiomulch.com> + @author Phil Burk <philburk@softsynth.com> +*/ +/* + * $Id: paex_sine.c 1752 2011-09-08 03:21:55Z philburk $ + * + * This program uses the PortAudio Portable Audio Library. + * For more information see: http://www.portaudio.com/ + * Copyright (c) 1999-2000 Ross Bencina and 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. + */ +#include <stdio.h> +#include <math.h> +#include "portaudio.h" + +#define NUM_SECONDS (5) +#define SAMPLE_RATE (44100) +#define FRAMES_PER_BUFFER (64) + +#ifndef M_PI +#define M_PI (3.14159265) +#endif + +#define TABLE_SIZE (200) + +class Sine +{ +public: + Sine() : stream(0), left_phase(0), right_phase(0) + { + /* initialise sinusoidal wavetable */ + for( int i=0; i<TABLE_SIZE; i++ ) + { + sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); + } + + sprintf( message, "No Message" ); + } + + bool open(PaDeviceIndex index) + { + PaStreamParameters outputParameters; + + outputParameters.device = index; + if (outputParameters.device == paNoDevice) { + return false; + } + + const PaDeviceInfo* pInfo = Pa_GetDeviceInfo(index); + if (pInfo != 0) + { + printf("Output device name: '%s'\r", pInfo->name); + } + + outputParameters.channelCount = 2; /* stereo output */ + outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ + outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; + outputParameters.hostApiSpecificStreamInfo = NULL; + + PaError err = Pa_OpenStream( + &stream, + NULL, /* no input */ + &outputParameters, + SAMPLE_RATE, + paFramesPerBufferUnspecified, + paClipOff, /* we won't output out of range samples so don't bother clipping them */ + &Sine::paCallback, + this /* Using 'this' for userData so we can cast to Sine* in paCallback method */ + ); + + if (err != paNoError) + { + /* Failed to open stream to device !!! */ + return false; + } + + err = Pa_SetStreamFinishedCallback( stream, &Sine::paStreamFinished ); + + if (err != paNoError) + { + Pa_CloseStream( stream ); + stream = 0; + + return false; + } + + return true; + } + + bool close() + { + if (stream == 0) + return false; + + PaError err = Pa_CloseStream( stream ); + stream = 0; + + return (err == paNoError); + } + + + bool start() + { + if (stream == 0) + return false; + + PaError err = Pa_StartStream( stream ); + + return (err == paNoError); + } + + bool stop() + { + if (stream == 0) + return false; + + PaError err = Pa_StopStream( stream ); + + return (err == paNoError); + } + +private: + /* The instance callback, where we have access to every method/variable in object of class Sine */ + int paCallbackMethod(const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags) + { + float *out = (float*)outputBuffer; + unsigned long i; + + (void) timeInfo; /* Prevent unused variable warnings. */ + (void) statusFlags; + (void) inputBuffer; + + for( i=0; i<framesPerBuffer; i++ ) + { + *out++ = sine[left_phase]; /* left */ + *out++ = sine[right_phase]; /* right */ + left_phase += 1; + if( left_phase >= TABLE_SIZE ) left_phase -= TABLE_SIZE; + right_phase += 3; /* higher pitch so we can distinguish left and right. */ + if( right_phase >= TABLE_SIZE ) right_phase -= TABLE_SIZE; + } + + return paContinue; + + } + + /* 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 paCallback( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void *userData ) + { + /* Here we cast userData to Sine* type so we can call the instance method paCallbackMethod, we can do that since + we called Pa_OpenStream with 'this' for userData */ + return ((Sine*)userData)->paCallbackMethod(inputBuffer, outputBuffer, + framesPerBuffer, + timeInfo, + statusFlags); + } + + + void paStreamFinishedMethod() + { + printf( "Stream Completed: %s\n", message ); + } + + /* + * This routine is called by portaudio when playback is done. + */ + static void paStreamFinished(void* userData) + { + return ((Sine*)userData)->paStreamFinishedMethod(); + } + + PaStream *stream; + float sine[TABLE_SIZE]; + int left_phase; + int right_phase; + char message[20]; +}; + +class ScopedPaHandler +{ +public: + ScopedPaHandler() + : _result(Pa_Initialize()) + { + } + ~ScopedPaHandler() + { + if (_result == paNoError) + { + Pa_Terminate(); + } + } + + PaError result() const { return _result; } + +private: + PaError _result; +}; + + +/*******************************************************************/ +int main(void); +int main(void) +{ + Sine sine; + + printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); + + ScopedPaHandler paInit; + if( paInit.result() != paNoError ) goto error; + + if (sine.open(Pa_GetDefaultOutputDevice())) + { + if (sine.start()) + { + printf("Play for %d seconds.\n", NUM_SECONDS ); + Pa_Sleep( NUM_SECONDS * 1000 ); + + sine.stop(); + } + + sine.close(); + } + + printf("Test finished.\n"); + return paNoError; + +error: + fprintf( stderr, "An error occurred while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", paInit.result() ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( paInit.result() ) ); + return 1; +} |