/** @file patest_stop_playout.c @brief Test whether all queued samples are played when Pa_StopStream() is used with a callback or read/write stream, or when the callback returns paComplete. @author Ross Bencina */ /* * $Id: patest_stop_playout.c,v 1.1 2006/06/10 21:30:57 dmazzoni Exp $ * * This program uses the PortAudio Portable Audio Library. * For more information see: http://www.portaudio.com/ * Copyright (c) 1999-2004 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. * * 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. * * 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. * */ #include #include #include "portaudio.h" #define SAMPLE_RATE (44100) #define FRAMES_PER_BUFFER (1024) #define TONE_SECONDS (1) /* long tone */ #define TONE_FADE_SECONDS (.04) /* fades at start and end of long tone */ #define GAP_SECONDS (.25) /* gap between long tone and blip */ #define BLIP_SECONDS (.035) /* short blip */ #define NUM_REPEATS (3) #ifndef M_PI #define M_PI (3.14159265) #endif #define TABLE_SIZE (2048) typedef struct { float sine[TABLE_SIZE+1]; int repeatCount; double phase; double lowIncrement, highIncrement; int gap1Length, toneLength, toneFadesLength, gap2Length, blipLength; int gap1Countdown, toneCountdown, gap2Countdown, blipCountdown; } TestData; static void RetriggerTestSignalGenerator( TestData *data ) { data->phase = 0.; data->gap1Countdown = data->gap1Length; data->toneCountdown = data->toneLength; data->gap2Countdown = data->gap2Length; data->blipCountdown = data->blipLength; } static void ResetTestSignalGenerator( TestData *data ) { data->repeatCount = 0; RetriggerTestSignalGenerator( data ); } static void InitTestSignalGenerator( TestData *data ) { int signalLengthModBufferLength, i; /* initialise sinusoidal wavetable */ for( i=0; isine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); } data->sine[TABLE_SIZE] = data->sine[0]; /* guard point for linear interpolation */ data->lowIncrement = (330. / SAMPLE_RATE) * TABLE_SIZE; data->highIncrement = (1760. / SAMPLE_RATE) * TABLE_SIZE; data->gap1Length = GAP_SECONDS * SAMPLE_RATE; data->toneLength = TONE_SECONDS * SAMPLE_RATE; data->toneFadesLength = TONE_FADE_SECONDS * SAMPLE_RATE; data->gap2Length = GAP_SECONDS * SAMPLE_RATE; data->blipLength = BLIP_SECONDS * SAMPLE_RATE; /* adjust signal length to be a multiple of the buffer length */ signalLengthModBufferLength = (data->gap1Length + data->toneLength + data->gap2Length + data->blipLength) % FRAMES_PER_BUFFER; if( signalLengthModBufferLength > 0 ) data->toneLength += signalLengthModBufferLength; ResetTestSignalGenerator( data ); } #define MIN( a, b ) (((a)<(b))?(a):(b)) static void GenerateTestSignal( TestData *data, float *stereo, int frameCount ) { int framesGenerated = 0; float output; long index; float fraction; int count, i; while( framesGenerated < frameCount && data->repeatCount < NUM_REPEATS ) { if( framesGenerated < frameCount && data->gap1Countdown > 0 ){ count = MIN( frameCount - framesGenerated, data->gap1Countdown ); for( i=0; i < count; ++i ) { *stereo++ = 0.f; *stereo++ = 0.f; } data->gap1Countdown -= count; framesGenerated += count; } if( framesGenerated < frameCount && data->toneCountdown > 0 ){ count = MIN( frameCount - framesGenerated, data->toneCountdown ); for( i=0; i < count; ++i ) { /* tone with data->lowIncrement phase increment */ index = (long)data->phase; fraction = data->phase - index; output = data->sine[ index ] + (data->sine[ index + 1 ] - data->sine[ index ]) * fraction; data->phase += data->lowIncrement; while( data->phase >= TABLE_SIZE ) data->phase -= TABLE_SIZE; /* apply fade to ends */ if( data->toneCountdown < data->toneFadesLength ) { /* cosine-bell fade out at end */ output *= (-cos(((float)data->toneCountdown / (float)data->toneFadesLength) * M_PI) + 1.) * .5; } else if( data->toneCountdown > data->toneLength - data->toneFadesLength ) { /* cosine-bell fade in at start */ output *= (cos(((float)(data->toneCountdown - (data->toneLength - data->toneFadesLength)) / (float)data->toneFadesLength) * M_PI) + 1.) * .5; } output *= .5; /* play tone half as loud as blip */ *stereo++ = output; *stereo++ = output; data->toneCountdown--; } framesGenerated += count; } if( framesGenerated < frameCount && data->gap2Countdown > 0 ){ count = MIN( frameCount - framesGenerated, data->gap2Countdown ); for( i=0; i < count; ++i ) { *stereo++ = 0.f; *stereo++ = 0.f; } data->gap2Countdown -= count; framesGenerated += count; } if( framesGenerated < frameCount && data->blipCountdown > 0 ){ count = MIN( frameCount - framesGenerated, data->blipCountdown ); for( i=0; i < count; ++i ) { /* tone with data->highIncrement phase increment */ index = (long)data->phase; fraction = data->phase - index; output = data->sine[ index ] + (data->sine[ index + 1 ] - data->sine[ index ]) * fraction; data->phase += data->highIncrement; while( data->phase >= TABLE_SIZE ) data->phase -= TABLE_SIZE; /* cosine-bell envelope over whole blip */ output *= (-cos( ((float)data->blipCountdown / (float)data->blipLength) * 2. * M_PI) + 1.) * .5; *stereo++ = output; *stereo++ = output; data->blipCountdown--; } framesGenerated += count; } if( data->blipCountdown == 0 ) { RetriggerTestSignalGenerator( data ); data->repeatCount++; } } if( framesGenerated < frameCount ) { count = frameCount - framesGenerated; for( i=0; i < count; ++i ) { *stereo++ = 0.f; *stereo++ = 0.f; } } } static int IsTestSignalFinished( TestData *data ) { if( data->repeatCount >= NUM_REPEATS ) return 1; else return 0; } static int TestCallback1( const void *inputBuffer, void *outputBuffer, unsigned long frameCount, const PaStreamCallbackTimeInfo* timeInfo, PaStreamCallbackFlags statusFlags, void *userData ) { (void) inputBuffer; /* Prevent unused variable warnings. */ (void) timeInfo; (void) statusFlags; GenerateTestSignal( (TestData*)userData, (float*)outputBuffer, frameCount ); if( IsTestSignalFinished( (TestData*)userData ) ) return paComplete; else return paContinue; } volatile int testCallback2Finished = 0; static int TestCallback2( const void *inputBuffer, void *outputBuffer, unsigned long frameCount, const PaStreamCallbackTimeInfo* timeInfo, PaStreamCallbackFlags statusFlags, void *userData ) { (void) inputBuffer; /* Prevent unused variable warnings. */ (void) timeInfo; (void) statusFlags; GenerateTestSignal( (TestData*)userData, (float*)outputBuffer, frameCount ); if( IsTestSignalFinished( (TestData*)userData ) ) testCallback2Finished = 1; return paContinue; } /*******************************************************************/ int main(void); int main(void) { PaStreamParameters outputParameters; PaStream *stream; PaError err; TestData data; float writeBuffer[ FRAMES_PER_BUFFER * 2 ]; printf("PortAudio Test: check that stopping stream plays out all queued samples. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); InitTestSignalGenerator( &data ); err = Pa_Initialize(); if( err != paNoError ) goto error; outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ outputParameters.channelCount = 2; /* stereo output */ outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultHighOutputLatency; outputParameters.hostApiSpecificStreamInfo = NULL; /* test paComplete ---------------------------------------------------------- */ ResetTestSignalGenerator( &data ); err = Pa_OpenStream( &stream, NULL, /* no input */ &outputParameters, SAMPLE_RATE, FRAMES_PER_BUFFER, paClipOff, /* we won't output out of range samples so don't bother clipping them */ TestCallback1, &data ); if( err != paNoError ) goto error; err = Pa_StartStream( stream ); if( err != paNoError ) goto error; printf("\nPlaying 'tone-blip' %d times using callback, stops by returning paComplete from callback.\n", NUM_REPEATS ); printf("If final blip is not intact, callback+paComplete implementation may be faulty.\n\n" ); while( (err = Pa_IsStreamActive( stream )) == 1 ) Pa_Sleep( 5 ); if( err != 0 ) goto error; err = Pa_StopStream( stream ); if( err != paNoError ) goto error; err = Pa_CloseStream( stream ); if( err != paNoError ) goto error; Pa_Sleep( 500 ); /* test Pa_StopStream() with callback --------------------------------------- */ ResetTestSignalGenerator( &data ); testCallback2Finished = 0; err = Pa_OpenStream( &stream, NULL, /* no input */ &outputParameters, SAMPLE_RATE, FRAMES_PER_BUFFER, paClipOff, /* we won't output out of range samples so don't bother clipping them */ TestCallback2, &data ); if( err != paNoError ) goto error; err = Pa_StartStream( stream ); if( err != paNoError ) goto error; printf("\nPlaying 'tone-blip' %d times using callback, stops by calling Pa_StopStream.\n", NUM_REPEATS ); printf("If final blip is not intact, callback+Pa_StopStream implementation may be faulty.\n\n" ); /* note that polling a volatile flag is not a good way to synchronise with the callback, but it's the best we can do portably. */ while( !testCallback2Finished ) Pa_Sleep( 2 ); err = Pa_StopStream( stream ); if( err != paNoError ) goto error; err = Pa_CloseStream( stream ); if( err != paNoError ) goto error; Pa_Sleep( 500 ); /* test Pa_StopStream() with Pa_WriteStream --------------------------------- */ ResetTestSignalGenerator( &data ); err = Pa_OpenStream( &stream, NULL, /* no input */ &outputParameters, SAMPLE_RATE, FRAMES_PER_BUFFER, paClipOff, /* we won't output out of range samples so don't bother clipping them */ NULL, /* no callback, use blocking API */ NULL ); /* no callback, so no callback userData */ if( err != paNoError ) goto error; err = Pa_StartStream( stream ); if( err != paNoError ) goto error; printf("\nPlaying 'tone-blip' %d times using Pa_WriteStream, stops by calling Pa_StopStream.\n", NUM_REPEATS ); printf("If final blip is not intact, Pa_WriteStream+Pa_StopStream implementation may be faulty.\n\n" ); do{ GenerateTestSignal( &data, writeBuffer, FRAMES_PER_BUFFER ); err = Pa_WriteStream( stream, writeBuffer, FRAMES_PER_BUFFER ); if( err != paNoError ) goto error; }while( !IsTestSignalFinished( &data ) ); err = Pa_StopStream( stream ); if( err != paNoError ) goto error; err = Pa_CloseStream( stream ); if( err != paNoError ) goto error; /* -------------------------------------------------------------------------- */ Pa_Terminate(); printf("Test finished.\n"); return err; error: Pa_Terminate(); fprintf( stderr, "An error occured while using the portaudio stream\n" ); fprintf( stderr, "Error number: %d\n", err ); fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); return err; }