patest_read_write_wire.c

mediastreamer2是开源的网络传输媒体流的库

/** @file patest_read_write_wire.c
	@brief Tests full duplex blocking I/O by passing input straight to output.
	@author Bjorn Roche. XO Audio LLC for Z-Systems Engineering.
    @author based on code by: Phil Burk  http://www.softsynth.com
    @author based on code by: Ross Bencina [e-mail]
*/
/*
 * $Id: patest_read_record.c 757 2004-02-13 07:48:10Z rossbencina $
 *
 * 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 <stdlib.h>
#include "portaudio.h"

/* #define SAMPLE_RATE  (17932) // Test failure to open with this value. */
#define SAMPLE_RATE  (44100)
#define FRAMES_PER_BUFFER (1024)
#define NUM_CHANNELS    (2)
/* #define DITHER_FLAG     (paDitherOff)  */
#define DITHER_FLAG     (0) /**/

/* Select sample format. */
#if 1
#define PA_SAMPLE_TYPE  paFloat32
typedef float SAMPLE;
#define SAMPLE_SILENCE  (0.0f)
#define PRINTF_S_FORMAT "%.8f"
#elif 1
#define PA_SAMPLE_TYPE  paInt16
typedef short SAMPLE;
#define SAMPLE_SILENCE  (0)
#define PRINTF_S_FORMAT "%d"
#elif 0
#define PA_SAMPLE_TYPE  paInt8
typedef char SAMPLE;
#define SAMPLE_SILENCE  (0)
#define PRINTF_S_FORMAT "%d"
#else
#define PA_SAMPLE_TYPE  paUInt8
typedef unsigned char SAMPLE;
#define SAMPLE_SILENCE  (128)
#define PRINTF_S_FORMAT "%d"
#endif


/*******************************************************************/
int main(void);
int main(void)
{
    PaStreamParameters inputParameters, outputParameters;
    PaStream *stream;
    PaError err;
    SAMPLE *sampleBlock;
    int i;
    int numBytes;
    
    
    printf("patest_read_write_wire.c\n"); fflush(stdout);

    numBytes = FRAMES_PER_BUFFER * NUM_CHANNELS * sizeof(SAMPLE);
    sampleBlock = (SAMPLE *) malloc( numBytes );
    if( sampleBlock == NULL )
    {
        printf("Could not allocate record array.\n");
        exit(1);
    }
    for( i=0; i<FRAMES_PER_BUFFER*NUM_CHANNELS; i++ )
        sampleBlock[i] = (SAMPLE_SILENCE);

    err = Pa_Initialize();
    if( err != paNoError ) goto error;

    inputParameters.device = Pa_GetDefaultInputDevice(); /* default input device */
    printf( "Input device # %d.\n", inputParameters.device );
    printf( "Input LL: %g s\n", Pa_GetDeviceInfo( inputParameters.device )->defaultLowInputLatency );
    printf( "Input HL: %g s\n", Pa_GetDeviceInfo( inputParameters.device )->defaultHighInputLatency );
    inputParameters.channelCount = NUM_CHANNELS;
    inputParameters.sampleFormat = PA_SAMPLE_TYPE;
    inputParameters.suggestedLatency = Pa_GetDeviceInfo( inputParameters.device )->defaultHighInputLatency ;
    inputParameters.hostApiSpecificStreamInfo = NULL;

    outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
    printf( "Output device # %d.\n", outputParameters.device );
    printf( "Output LL: %g s\n", Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency );
    printf( "Output HL: %g s\n", Pa_GetDeviceInfo( outputParameters.device )->defaultHighOutputLatency );
    outputParameters.channelCount = NUM_CHANNELS;
    outputParameters.sampleFormat = PA_SAMPLE_TYPE;
    outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultHighOutputLatency;
    outputParameters.hostApiSpecificStreamInfo = NULL;

    /* -- setup -- */

   err = Pa_OpenStream(
              &stream,
              &inputParameters,
              &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("Wire on. Will run one minute.\n"); fflush(stdout);

    for( i=0; i<(60*SAMPLE_RATE)/FRAMES_PER_BUFFER; ++i )
    {
       err = Pa_WriteStream( stream, sampleBlock, FRAMES_PER_BUFFER );
       if( err ) goto xrun;
       err = Pa_ReadStream( stream, sampleBlock, FRAMES_PER_BUFFER );
       if( err ) goto xrun;
    }
    err = Pa_StopStream( stream );
    if( err != paNoError ) goto error;

    for( i=0; i<FRAMES_PER_BUFFER*NUM_CHANNELS; i++ )
        sampleBlock[i] = (SAMPLE_SILENCE);

    err = Pa_StartStream( stream );
    if( err != paNoError ) goto error;
    printf("Wire on. Interrupt to stop.\n"); fflush(stdout);

    while( 1 )
    {
       err = Pa_WriteStream( stream, sampleBlock, FRAMES_PER_BUFFER );
       if( err ) goto xrun;
       err = Pa_ReadStream( stream, sampleBlock, FRAMES_PER_BUFFER );
       if( err ) goto xrun;
    }
    err = Pa_StopStream( stream );
    if( err != paNoError ) goto error;

    free( sampleBlock );

    Pa_Terminate();
    return 0;

xrun:
    Pa_Terminate();
    if( err & paInputOverflow )
       fprintf( stderr, "Input Overflow.\n" );
    if( err & paOutputUnderflow )
       fprintf( stderr, "Output Underflow.\n" );
    return -2;

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 -1;
}