cannam@140: /** @file patest_sine_time.c cannam@140: @ingroup test_src cannam@140: @brief Play a sine wave for several seconds, pausing in the middle. cannam@140: Uses the Pa_GetStreamTime() call. cannam@140: @author Ross Bencina cannam@140: @author Phil Burk cannam@140: */ cannam@140: /* cannam@140: * $Id$ cannam@140: * cannam@140: * This program uses the PortAudio Portable Audio Library. cannam@140: * For more information see: http://www.portaudio.com cannam@140: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@140: * cannam@140: * Permission is hereby granted, free of charge, to any person obtaining cannam@140: * a copy of this software and associated documentation files cannam@140: * (the "Software"), to deal in the Software without restriction, cannam@140: * including without limitation the rights to use, copy, modify, merge, cannam@140: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@140: * and to permit persons to whom the Software is furnished to do so, cannam@140: * subject to the following conditions: cannam@140: * cannam@140: * The above copyright notice and this permission notice shall be cannam@140: * included in all copies or substantial portions of the Software. cannam@140: * cannam@140: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@140: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@140: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@140: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@140: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@140: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@140: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@140: */ cannam@140: cannam@140: /* cannam@140: * The text above constitutes the entire PortAudio license; however, cannam@140: * the PortAudio community also makes the following non-binding requests: cannam@140: * cannam@140: * Any person wishing to distribute modifications to the Software is cannam@140: * requested to send the modifications to the original developer so that cannam@140: * they can be incorporated into the canonical version. It is also cannam@140: * requested that these non-binding requests be included along with the cannam@140: * license above. cannam@140: */ cannam@140: #include cannam@140: #include cannam@140: cannam@140: #include "portaudio.h" cannam@140: #include "pa_util.h" cannam@140: cannam@140: #define NUM_SECONDS (8) cannam@140: #define SAMPLE_RATE (44100) cannam@140: #define FRAMES_PER_BUFFER (64) cannam@140: cannam@140: #ifndef M_PI cannam@140: #define M_PI (3.14159265) cannam@140: #endif cannam@140: #define TWOPI (M_PI * 2.0) cannam@140: cannam@140: #define TABLE_SIZE (200) cannam@140: cannam@140: typedef struct cannam@140: { cannam@140: double left_phase; cannam@140: double right_phase; cannam@140: volatile PaTime outTime; cannam@140: } cannam@140: paTestData; cannam@140: cannam@140: /* This routine will be called by the PortAudio engine when audio is needed. cannam@140: ** It may called at interrupt level on some machines so don't do anything cannam@140: ** that could mess up the system like calling malloc() or free(). cannam@140: */ cannam@140: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@140: unsigned long framesPerBuffer, cannam@140: const PaStreamCallbackTimeInfo* timeInfo, cannam@140: PaStreamCallbackFlags statusFlags, cannam@140: void *userData ) cannam@140: { cannam@140: paTestData *data = (paTestData*)userData; cannam@140: float *out = (float*)outputBuffer; cannam@140: unsigned int i; cannam@140: cannam@140: double left_phaseInc = 0.02; cannam@140: double right_phaseInc = 0.06; cannam@140: cannam@140: double left_phase = data->left_phase; cannam@140: double right_phase = data->right_phase; cannam@140: cannam@140: (void) statusFlags; /* Prevent unused variable warnings. */ cannam@140: (void) inputBuffer; cannam@140: cannam@140: data->outTime = timeInfo->outputBufferDacTime; cannam@140: cannam@140: for( i=0; i TWOPI ) left_phase -= TWOPI; cannam@140: *out++ = (float) sin( left_phase ); cannam@140: cannam@140: right_phase += right_phaseInc; cannam@140: if( right_phase > TWOPI ) right_phase -= TWOPI; cannam@140: *out++ = (float) sin( right_phase ); cannam@140: } cannam@140: cannam@140: data->left_phase = left_phase; cannam@140: data->right_phase = right_phase; cannam@140: cannam@140: return paContinue; cannam@140: } cannam@140: cannam@140: /*******************************************************************/ cannam@140: static void ReportStreamTime( PaStream *stream, paTestData *data ); cannam@140: static void ReportStreamTime( PaStream *stream, paTestData *data ) cannam@140: { cannam@140: PaTime streamTime, latency, outTime; cannam@140: cannam@140: streamTime = Pa_GetStreamTime( stream ); cannam@140: outTime = data->outTime; cannam@140: if( outTime < 0.0 ) cannam@140: { cannam@140: printf("Stream time = %8.1f\n", streamTime ); cannam@140: } cannam@140: else cannam@140: { cannam@140: latency = outTime - streamTime; cannam@140: printf("Stream time = %8.4f, outTime = %8.4f, latency = %8.4f\n", cannam@140: streamTime, outTime, latency ); cannam@140: } cannam@140: fflush(stdout); cannam@140: } cannam@140: cannam@140: /*******************************************************************/ cannam@140: int main(void); cannam@140: int main(void) cannam@140: { cannam@140: PaStreamParameters outputParameters; cannam@140: PaStream *stream; cannam@140: PaError err; cannam@140: paTestData data; cannam@140: PaTime startTime; cannam@140: cannam@140: printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); cannam@140: cannam@140: data.left_phase = data.right_phase = 0; cannam@140: cannam@140: err = Pa_Initialize(); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ cannam@140: if (outputParameters.device == paNoDevice) { cannam@140: fprintf(stderr,"Error: No default output device.\n"); cannam@140: goto error; cannam@140: } cannam@140: outputParameters.channelCount = 2; /* stereo output */ cannam@140: outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ cannam@140: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; cannam@140: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@140: cannam@140: err = Pa_OpenStream( cannam@140: &stream, cannam@140: NULL, /* no input */ cannam@140: &outputParameters, cannam@140: SAMPLE_RATE, cannam@140: FRAMES_PER_BUFFER, cannam@140: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@140: patestCallback, cannam@140: &data ); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: /* Watch until sound is halfway finished. */ cannam@140: printf("Play for %d seconds.\n", NUM_SECONDS/2 ); fflush(stdout); cannam@140: cannam@140: data.outTime = -1.0; /* mark time for callback as undefined */ cannam@140: err = Pa_StartStream( stream ); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: startTime = Pa_GetStreamTime( stream ); cannam@140: cannam@140: do cannam@140: { cannam@140: ReportStreamTime( stream, &data ); cannam@140: Pa_Sleep(100); cannam@140: } while( (Pa_GetStreamTime( stream ) - startTime) < (NUM_SECONDS/2) ); cannam@140: cannam@140: /* Stop sound for 2 seconds. */ cannam@140: err = Pa_StopStream( stream ); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: printf("Pause for 2 seconds.\n"); fflush(stdout); cannam@140: Pa_Sleep( 2000 ); cannam@140: cannam@140: data.outTime = -1.0; /* mark time for callback as undefined */ cannam@140: err = Pa_StartStream( stream ); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: startTime = Pa_GetStreamTime( stream ); cannam@140: cannam@140: printf("Play until sound is finished.\n"); fflush(stdout); cannam@140: do cannam@140: { cannam@140: ReportStreamTime( stream, &data ); cannam@140: Pa_Sleep(100); cannam@140: } while( (Pa_GetStreamTime( stream ) - startTime) < (NUM_SECONDS/2) ); cannam@140: cannam@140: err = Pa_CloseStream( stream ); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: Pa_Terminate(); cannam@140: printf("Test finished.\n"); cannam@140: return err; cannam@140: cannam@140: error: cannam@140: Pa_Terminate(); cannam@140: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@140: fprintf( stderr, "Error number: %d\n", err ); cannam@140: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@140: return err; cannam@140: }