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/*
* $Id: patest_wire.c,v 1.2.4.3 2003/04/10 23:09:40 philburk Exp $
* patest_wire.c
*
* Pass input directly to output.
* Note that some HW devices, for example many ISA audio cards
* on PCs, do NOT support full duplex! For a PC, you normally need
* a PCI based audio card such as the SBLive.
*
* Author: Phil Burk http://www.softsynth.com
*
* 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 INPUT_DEVICE Pa_GetDefaultInputDeviceID()
#define OUTPUT_DEVICE Pa_GetDefaultOutputDeviceID()
/*
** Note that many of the older ISA sound cards on PCs do NOT support
** full duplex audio (simultaneous record and playback).
** And some only support full duplex at lower sample rates.
*/
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (64)
#if 1
#define PA_SAMPLE_TYPE paFloat32
typedef float SAMPLE;
#else
#define PA_SAMPLE_TYPE paInt16
typedef short SAMPLE;
#endif
static int wireCallback( void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
PaTimestamp outTime, void *userData );
/* This routine will be called by the PortAudio engine when audio is needed.
** It may be 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 wireCallback( void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
PaTimestamp outTime, void *userData )
{
SAMPLE *out = (SAMPLE*)outputBuffer;
SAMPLE *in = (SAMPLE*)inputBuffer;
unsigned int i;
(void) outTime;
int samplesPerFrame;
int numSamples;
samplesPerFrame = (int) userData;
numSamples = framesPerBuffer * samplesPerFrame;
/* This may get called with NULL inputBuffer during initial setup. */
if( inputBuffer == NULL )
{
for( i=0; i<numSamples; i++ )
{
*out++ = 0;
}
}
else
{
for( i=0; i<numSamples; i++ )
{
*out++ = *in++;
}
}
return 0;
}
/*******************************************************************/
int main(void);
int main(void)
{
PortAudioStream *stream;
PaError err;
const PaDeviceInfo *inputInfo;
const PaDeviceInfo *outputInfo;
int numChannels;
err = Pa_Initialize();
if( err != paNoError ) goto error;
printf("PortAudio Test: input device ID = %d\n", INPUT_DEVICE );
printf("PortAudio Test: output device ID = %d\n", OUTPUT_DEVICE );
/* Use as many channels aspossible. */
inputInfo = Pa_GetDeviceInfo( INPUT_DEVICE );
outputInfo = Pa_GetDeviceInfo( OUTPUT_DEVICE );
/* Use smaller count. */
numChannels = (inputInfo->maxInputChannels < outputInfo->maxOutputChannels) ?
inputInfo->maxInputChannels : outputInfo->maxOutputChannels;
printf("maxInputChannels channels = %d\n", inputInfo->maxInputChannels );
printf("maxOutputChannels channels = %d\n", outputInfo->maxOutputChannels );
if( numChannels > 0 )
{
printf("Using %d channels.\n", numChannels );
err = Pa_OpenStream(
&stream,
INPUT_DEVICE,
numChannels,
PA_SAMPLE_TYPE,
NULL,
OUTPUT_DEVICE,
numChannels,
PA_SAMPLE_TYPE,
NULL,
SAMPLE_RATE,
FRAMES_PER_BUFFER, /* frames per buffer */
0, /* number of buffers, if zero then use default minimum */
paClipOff, /* we won't output out of range samples so don't bother clipping them */
wireCallback,
(void *) numChannels ); /* pass numChannels to callback */
if( err != paNoError ) goto error;
err = Pa_StartStream( stream );
if( err != paNoError ) goto error;
printf("Full duplex sound test in progress.\n");
printf("Hit ENTER to exit test.\n"); fflush(stdout);
getchar();
printf("Closing stream.\n");
err = Pa_CloseStream( stream );
if( err != paNoError ) goto error;
}
else
{
printf("Sorry, not enough channels.\n");
}
Pa_Terminate();
printf("Full duplex sound test complete.\n"); fflush(stdout);
return 0;
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;
}
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