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Diffstat (limited to 'portaudio/test/patest_stop.c')
| -rw-r--r-- | portaudio/test/patest_stop.c | 324 |
1 files changed, 324 insertions, 0 deletions
diff --git a/portaudio/test/patest_stop.c b/portaudio/test/patest_stop.c new file mode 100644 index 0000000..164ad4e --- /dev/null +++ b/portaudio/test/patest_stop.c @@ -0,0 +1,324 @@ +/** @file patest_stop.c + @ingroup test_src + @brief Test different ways of stopping audio. + + Test the three ways of stopping audio: + - calling Pa_StopStream(), + - calling Pa_AbortStream(), + - and returning a 1 from the callback function. + + A long latency is set up so that you can hear the difference. + Then a simple 8 note sequence is repeated twice. + The program will print what you should hear. + + @author Phil Burk <philburk@softsynth.com> +*/ +/* + * $Id$ + * + * 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 OUTPUT_DEVICE (Pa_GetDefaultOutputDevice()) +#define SLEEP_DUR (200) +#define SAMPLE_RATE (44100) +#define FRAMES_PER_BUFFER (256) +#define LATENCY_SECONDS (3.f) +#define FRAMES_PER_NOTE (SAMPLE_RATE/2) +#define MAX_REPEATS (2) +#define FUNDAMENTAL (400.0f / SAMPLE_RATE) +#define NOTE_0 (FUNDAMENTAL * 1.0f / 1.0f) +#define NOTE_1 (FUNDAMENTAL * 5.0f / 4.0f) +#define NOTE_2 (FUNDAMENTAL * 4.0f / 3.0f) +#define NOTE_3 (FUNDAMENTAL * 3.0f / 2.0f) +#define NOTE_4 (FUNDAMENTAL * 2.0f / 1.0f) +#define MODE_FINISH (0) +#define MODE_STOP (1) +#define MODE_ABORT (2) +#ifndef M_PI +#define M_PI (3.14159265) +#endif +#define TABLE_SIZE (400) + +typedef struct +{ + float waveform[TABLE_SIZE + 1]; /* Add one for guard point for interpolation. */ + float phase_increment; + float phase; + float *tune; + int notesPerTune; + int frameCounter; + int noteCounter; + int repeatCounter; + PaTime outTime; + int stopMode; + int done; +} +paTestData; + +/************* Prototypes *****************************/ +int TestStopMode( paTestData *data ); +float LookupWaveform( paTestData *data, float phase ); + +/****************************************************** + * Convert phase between 0.0 and 1.0 to waveform value + * using linear interpolation. + */ +float LookupWaveform( paTestData *data, float phase ) +{ + float fIndex = phase*TABLE_SIZE; + int index = (int) fIndex; + float fract = fIndex - index; + float lo = data->waveform[index]; + float hi = data->waveform[index+1]; + float val = lo + fract*(hi-lo); + return val; +} + +/* 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; + float *out = (float*)outputBuffer; + float value; + unsigned int i = 0; + int finished = paContinue; + + (void) inputBuffer; /* Prevent unused variable warnings. */ + (void) timeInfo; + (void) statusFlags; + + + /* data->outTime = outTime; */ + + if( !data->done ) + { + for( i=0; i<framesPerBuffer; i++ ) + { + /* Are we done with this note? */ + if( data->frameCounter >= FRAMES_PER_NOTE ) + { + data->noteCounter += 1; + data->frameCounter = 0; + /* Are we done with this tune? */ + if( data->noteCounter >= data->notesPerTune ) + { + data->noteCounter = 0; + data->repeatCounter += 1; + /* Are we totally done? */ + if( data->repeatCounter >= MAX_REPEATS ) + { + data->done = 1; + if( data->stopMode == MODE_FINISH ) + { + finished = paComplete; + break; + } + } + } + data->phase_increment = data->tune[data->noteCounter]; + } + value = LookupWaveform(data, data->phase); + *out++ = value; /* left */ + *out++ = value; /* right */ + data->phase += data->phase_increment; + if( data->phase >= 1.0f ) data->phase -= 1.0f; + + data->frameCounter += 1; + } + } + /* zero remainder of final buffer */ + for( ; i<framesPerBuffer; i++ ) + { + *out++ = 0; /* left */ + *out++ = 0; /* right */ + } + return finished; +} +/*******************************************************************/ +int main(void); +int main(void) +{ + paTestData data; + int i; + float simpleTune[] = { NOTE_0, NOTE_1, NOTE_2, NOTE_3, NOTE_4, NOTE_3, NOTE_2, NOTE_1 }; + + printf("PortAudio Test: play song and test stopping. ask for %f seconds latency\n", LATENCY_SECONDS ); + /* initialise sinusoidal wavetable */ + for( i=0; i<TABLE_SIZE; i++ ) + { + data.waveform[i] = (float) ( + (0.2 * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. )) + + (0.2 * sin( ((double)(3*i)/(double)TABLE_SIZE) * M_PI * 2. )) + + (0.1 * sin( ((double)(5*i)/(double)TABLE_SIZE) * M_PI * 2. )) + ); + } + data.waveform[TABLE_SIZE] = data.waveform[0]; /* Set guard point. */ + data.tune = &simpleTune[0]; + data.notesPerTune = sizeof(simpleTune) / sizeof(float); + + printf("Test MODE_FINISH - callback returns 1.\n"); + printf("Should hear entire %d note tune repeated twice.\n", data.notesPerTune); + data.stopMode = MODE_FINISH; + if( TestStopMode( &data ) != paNoError ) + { + printf("Test of MODE_FINISH failed!\n"); + goto error; + } + + printf("Test MODE_STOP - stop when song is done.\n"); + printf("Should hear entire %d note tune repeated twice.\n", data.notesPerTune); + data.stopMode = MODE_STOP; + if( TestStopMode( &data ) != paNoError ) + { + printf("Test of MODE_STOP failed!\n"); + goto error; + } + + printf("Test MODE_ABORT - abort immediately.\n"); + printf("Should hear last repetition cut short by %f seconds.\n", LATENCY_SECONDS); + data.stopMode = MODE_ABORT; + if( TestStopMode( &data ) != paNoError ) + { + printf("Test of MODE_ABORT failed!\n"); + goto error; + } + + return 0; + +error: + return 1; +} + +int TestStopMode( paTestData *data ) +{ + PaStreamParameters outputParameters; + PaStream *stream; + PaError err; + + data->done = 0; + data->phase = 0.0; + data->frameCounter = 0; + data->noteCounter = 0; + data->repeatCounter = 0; + data->phase_increment = data->tune[data->noteCounter]; + + err = Pa_Initialize(); + if( err != paNoError ) goto error; + + outputParameters.device = OUTPUT_DEVICE; + if (outputParameters.device == paNoDevice) { + fprintf(stderr,"Error: No default output device.\n"); + goto error; + } + outputParameters.channelCount = 2; /* stereo output */ + outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ + outputParameters.suggestedLatency = LATENCY_SECONDS; + outputParameters.hostApiSpecificStreamInfo = NULL; + + err = Pa_OpenStream( + &stream, + NULL, /* no input */ + &outputParameters, + SAMPLE_RATE, + FRAMES_PER_BUFFER, /* frames per buffer */ + paClipOff, /* we won't output out of range samples so don't bother clipping them */ + patestCallback, + data ); + if( err != paNoError ) goto error; + + err = Pa_StartStream( stream ); + if( err != paNoError ) goto error; + + if( data->stopMode == MODE_FINISH ) + { + while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) + { + /*printf("outTime = %g, note# = %d, repeat# = %d\n", data->outTime, + data->noteCounter, data->repeatCounter ); + fflush(stdout); */ + Pa_Sleep( SLEEP_DUR ); + } + if( err < 0 ) goto error; + } + else + { + while( data->repeatCounter < MAX_REPEATS ) + { + /*printf("outTime = %g, note# = %d, repeat# = %d\n", data->outTime, + data->noteCounter, data->repeatCounter ); + fflush(stdout); */ + Pa_Sleep( SLEEP_DUR ); + } + } + + if( data->stopMode == MODE_ABORT ) + { + printf("Call Pa_AbortStream()\n"); + err = Pa_AbortStream( stream ); + } + else + { + printf("Call Pa_StopStream()\n"); + err = Pa_StopStream( stream ); + } + if( err != paNoError ) goto error; + + printf("Call Pa_CloseStream()\n"); fflush(stdout); + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto error; + + Pa_Terminate(); + printf("Test finished.\n"); + + return err; + +error: + Pa_Terminate(); + 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; +} |