cannam@162: /** @file patest_two_rates.c cannam@162: @ingroup test_src cannam@162: @brief Play two streams at different rates to make sure they don't interfere. cannam@162: @author Phil Burk cannam@162: */ cannam@162: /* cannam@162: * $Id$ cannam@162: * cannam@162: * Author: Phil Burk http://www.softsynth.com cannam@162: * cannam@162: * This program uses the PortAudio Portable Audio Library. cannam@162: * For more information see: http://www.portaudio.com cannam@162: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@162: * cannam@162: * Permission is hereby granted, free of charge, to any person obtaining cannam@162: * a copy of this software and associated documentation files cannam@162: * (the "Software"), to deal in the Software without restriction, cannam@162: * including without limitation the rights to use, copy, modify, merge, cannam@162: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@162: * and to permit persons to whom the Software is furnished to do so, cannam@162: * subject to the following conditions: cannam@162: * cannam@162: * The above copyright notice and this permission notice shall be cannam@162: * included in all copies or substantial portions of the Software. cannam@162: * cannam@162: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@162: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@162: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@162: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@162: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@162: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@162: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@162: */ cannam@162: cannam@162: /* cannam@162: * The text above constitutes the entire PortAudio license; however, cannam@162: * the PortAudio community also makes the following non-binding requests: cannam@162: * cannam@162: * Any person wishing to distribute modifications to the Software is cannam@162: * requested to send the modifications to the original developer so that cannam@162: * they can be incorporated into the canonical version. It is also cannam@162: * requested that these non-binding requests be included along with the cannam@162: * license above. cannam@162: */ cannam@162: cannam@162: #include cannam@162: #include cannam@162: #include "portaudio.h" cannam@162: cannam@162: #define OUTPUT_DEVICE (Pa_GetDefaultOutputDeviceID()) cannam@162: #define SAMPLE_RATE_1 (44100) cannam@162: #define SAMPLE_RATE_2 (48000) cannam@162: #define FRAMES_PER_BUFFER (256) cannam@162: #define FREQ_INCR (0.1) cannam@162: cannam@162: #ifndef M_PI cannam@162: #define M_PI (3.14159265) cannam@162: #endif cannam@162: cannam@162: typedef struct cannam@162: { cannam@162: double phase; cannam@162: int numFrames; cannam@162: } paTestData; cannam@162: cannam@162: /* This routine will be called by the PortAudio engine when audio is needed. cannam@162: ** It may called at interrupt level on some machines so don't do anything cannam@162: ** that could mess up the system like calling malloc() or free(). cannam@162: */ cannam@162: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@162: unsigned long framesPerBuffer, cannam@162: const PaStreamCallbackTimeInfo* timeInfo, cannam@162: PaStreamCallbackFlags statusFlags, cannam@162: void *userData ) cannam@162: { cannam@162: paTestData *data = (paTestData*)userData; cannam@162: float *out = (float*)outputBuffer; cannam@162: int frameIndex; cannam@162: (void) timeInfo; /* Prevent unused variable warnings. */ cannam@162: (void) inputBuffer; cannam@162: cannam@162: for( frameIndex=0; frameIndex<(int)framesPerBuffer; frameIndex++ ) cannam@162: { cannam@162: /* Generate sine wave. */ cannam@162: float value = (float) 0.3 * sin(data->phase); cannam@162: /* Stereo - two channels. */ cannam@162: *out++ = value; cannam@162: *out++ = value; cannam@162: cannam@162: data->phase += FREQ_INCR; cannam@162: if( data->phase >= (2.0 * M_PI) ) data->phase -= (2.0 * M_PI); cannam@162: } cannam@162: data->numFrames += 1; cannam@162: return 0; cannam@162: } cannam@162: cannam@162: /*******************************************************************/ cannam@162: int main(void); cannam@162: int main(void) cannam@162: { cannam@162: PaError err; cannam@162: PaStreamParameters outputParameters; cannam@162: PaStream *stream1; cannam@162: PaStream *stream2; cannam@162: paTestData data1 = {0}; cannam@162: paTestData data2 = {0}; cannam@162: printf("PortAudio Test: two rates.\n" ); cannam@162: cannam@162: err = Pa_Initialize(); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ cannam@162: if (outputParameters.device == paNoDevice) { cannam@162: fprintf(stderr,"Error: No default output device.\n"); cannam@162: goto error; cannam@162: } cannam@162: outputParameters.channelCount = 2; /* stereo output */ cannam@162: outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ cannam@162: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; cannam@162: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@162: cannam@162: /* Start first stream. **********************/ cannam@162: err = Pa_OpenStream( cannam@162: &stream1, cannam@162: NULL, /* no input */ cannam@162: &outputParameters, cannam@162: SAMPLE_RATE_1, cannam@162: FRAMES_PER_BUFFER, cannam@162: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@162: patestCallback, cannam@162: &data1 ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: err = Pa_StartStream( stream1 ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: Pa_Sleep( 3 * 1000 ); cannam@162: cannam@162: /* Start second stream. **********************/ cannam@162: err = Pa_OpenStream( cannam@162: &stream2, cannam@162: NULL, /* no input */ cannam@162: &outputParameters, cannam@162: SAMPLE_RATE_2, cannam@162: FRAMES_PER_BUFFER, cannam@162: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@162: patestCallback, cannam@162: &data2 ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: err = Pa_StartStream( stream2 ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: Pa_Sleep( 3 * 1000 ); cannam@162: cannam@162: err = Pa_StopStream( stream2 ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: Pa_Sleep( 3 * 1000 ); cannam@162: cannam@162: err = Pa_StopStream( stream1 ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: Pa_CloseStream( stream2 ); cannam@162: Pa_CloseStream( stream1 ); cannam@162: cannam@162: Pa_Terminate(); cannam@162: cannam@162: printf("NumFrames = %d on stream1, %d on stream2.\n", data1.numFrames, data2.numFrames ); cannam@162: printf("Test finished.\n"); cannam@162: return err; cannam@162: error: cannam@162: Pa_Terminate(); cannam@162: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@162: fprintf( stderr, "Error number: %d\n", err ); cannam@162: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@162: return err; cannam@162: }