/* * $Id: debug_multi_in.c,v 1.2 2003/03/02 08:01:39 dmazzoni Exp $ * debug_multi_in.c * Pass output from each of multiple channels * to a stereo output using the Portable Audio api. * Hacked test for debugging PA. * * 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 <string.h>#include "portaudio.h"//#define INPUT_DEVICE_NAME   ("EWS88 MT Interleaved Rec")#define OUTPUT_DEVICE       (Pa_GetDefaultOutputDeviceID())//#define OUTPUT_DEVICE       (18)#define SAMPLE_RATE         (22050)#define FRAMES_PER_BUFFER   (256)#define MIN_LATENCY_MSEC    (400)#define NUM_BUFFERS         ((MIN_LATENCY_MSEC * SAMPLE_RATE) / (FRAMES_PER_BUFFER * 1000))#ifndef M_PI#define M_PI  (3.14159265)#endiftypedef struct{    int      liveChannel;    int      numChannels;}paTestData;/* 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( void *inputBuffer, void *outputBuffer,                           unsigned long framesPerBuffer,                           PaTimestamp outTime, void *userData ){    paTestData *data = (paTestData*)userData;    float *out = (float*)outputBuffer;    float *in = (float*)inputBuffer;    int i;    int finished = 0;    (void) outTime; /* Prevent unused variable warnings. */    (void) inputBuffer;    if( in == NULL ) return 0;    for( i=0; i<(int)framesPerBuffer; i++ )    {        /* Copy one channel of input to output. */        *out++ = in[data->liveChannel];        *out++ = in[data->liveChannel];        in += data->numChannels;    }    return 0;}/*******************************************************************/int PaFindDeviceByName( const char *name ){    int   i;    int   numDevices;    const PaDeviceInfo *pdi;    int   len = strlen( name );    PaDeviceID   result = paNoDevice;    numDevices = Pa_CountDevices();    for( i=0; i<numDevices; i++ )    {        pdi = Pa_GetDeviceInfo( i );        if( strncmp( name, pdi->name, len ) == 0 )        {            result = i;            break;        }    }    return result;}/*******************************************************************/int main(void);int main(void){    PortAudioStream *stream;    PaError err;    paTestData data;    int i;    PaDeviceID inputDevice;    const PaDeviceInfo *pdi;    printf("PortAudio Test: input signal from each channel. %d buffers\n", NUM_BUFFERS );    data.liveChannel = 0;    err = Pa_Initialize();    if( err != paNoError ) goto error;#ifdef INPUT_DEVICE_NAME    printf("Try to use device: %s\n", INPUT_DEVICE_NAME );    inputDevice = PaFindDeviceByName(INPUT_DEVICE_NAME);    if( inputDevice == paNoDevice )    {        printf("Could not find %s. Using default instead.\n", INPUT_DEVICE_NAME );        inputDevice = Pa_GetDefaultInputDeviceID();    }#else    printf("Using default input device.\n");    inputDevice = Pa_GetDefaultInputDeviceID();#endif    pdi = Pa_GetDeviceInfo( inputDevice );    if( pdi == NULL )    {        printf("Could not get device info!\n");        goto error;    }    data.numChannels = pdi->maxInputChannels;    printf("Input Device name is %s\n", pdi->name );    printf("Input Device has %d channels.\n", pdi->maxInputChannels);    err = Pa_OpenStream(              &stream,              inputDevice,              pdi->maxInputChannels,              paFloat32,  /* 32 bit floating point input */              NULL,              OUTPUT_DEVICE,              2,              paFloat32,  /* 32 bit floating point output */              NULL,              SAMPLE_RATE,              FRAMES_PER_BUFFER,  /* frames per buffer */              NUM_BUFFERS,    /* number of buffers, if zero then use default minimum */              paClipOff,      /* we won't output out of range samples so don't bother clipping them */              patestCallback,              &data );    if( err != paNoError ) goto error;    data.liveChannel = 0;    err = Pa_StartStream( stream );    if( err != paNoError ) goto error;    for( i=0; i<data.numChannels; i++ )    {        data.liveChannel = i;        printf("Channel %d being sent to output. Hit ENTER for next channel.", i );        fflush(stdout);        getchar();    }    err = Pa_StopStream( stream );    if( err != paNoError ) goto error;    err = Pa_CloseStream( stream );    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;}