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prosperon/source/portaudio/test/patest_stop.c

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/** @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;
}
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