/* * $Id: debug_multi_in.c,v 1.1.1.1 2003-05-09 16:03:56 ggeiger 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 #include #include #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) #endif typedef 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; iname, 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