patest_stop_playout.c

一个开源的sip源代码

/** @file patest_stop_playout.c
	@ingroup test_src
	@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 <[e-mail]>
*/
/*
 * $Id: patest_stop_playout.c 1097 2006-08-26 08:27:53Z rossb $
 *
 * 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.
 *
 * 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 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; i<TABLE_SIZE; i++ )
    {
        data->sine[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;
}