314 lines
10 KiB
C
314 lines
10 KiB
C
|
/** @file patest_stop.c
|
||
|
|
@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: patest_stop.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) 1999-2000 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.
|
||
|
|
*
|
||
|
|
* 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 <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;
|
||
|
|
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 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;
|
||
|
|
}
|