cannam@89: /** @file patest_sine_time.c cannam@89: @ingroup test_src cannam@89: @brief Play a sine wave for several seconds, pausing in the middle. cannam@89: Uses the Pa_GetStreamTime() call. cannam@89: @author Ross Bencina cannam@89: @author Phil Burk cannam@89: */ cannam@89: /* cannam@89: * $Id: patest_sine_time.c 1368 2008-03-01 00:38:27Z rossb $ cannam@89: * cannam@89: * This program uses the PortAudio Portable Audio Library. cannam@89: * For more information see: http://www.portaudio.com cannam@89: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@89: * cannam@89: * Permission is hereby granted, free of charge, to any person obtaining cannam@89: * a copy of this software and associated documentation files cannam@89: * (the "Software"), to deal in the Software without restriction, cannam@89: * including without limitation the rights to use, copy, modify, merge, cannam@89: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@89: * and to permit persons to whom the Software is furnished to do so, cannam@89: * subject to the following conditions: cannam@89: * cannam@89: * The above copyright notice and this permission notice shall be cannam@89: * included in all copies or substantial portions of the Software. cannam@89: * cannam@89: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@89: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@89: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@89: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@89: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@89: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@89: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@89: */ cannam@89: cannam@89: /* cannam@89: * The text above constitutes the entire PortAudio license; however, cannam@89: * the PortAudio community also makes the following non-binding requests: cannam@89: * cannam@89: * Any person wishing to distribute modifications to the Software is cannam@89: * requested to send the modifications to the original developer so that cannam@89: * they can be incorporated into the canonical version. It is also cannam@89: * requested that these non-binding requests be included along with the cannam@89: * license above. cannam@89: */ cannam@89: #include cannam@89: #include cannam@89: cannam@89: #include "portaudio.h" cannam@89: #include "pa_util.h" cannam@89: cannam@89: #define NUM_SECONDS (8) cannam@89: #define SAMPLE_RATE (44100) cannam@89: #define FRAMES_PER_BUFFER (64) cannam@89: cannam@89: #ifndef M_PI cannam@89: #define M_PI (3.14159265) cannam@89: #endif cannam@89: #define TWOPI (M_PI * 2.0) cannam@89: cannam@89: #define TABLE_SIZE (200) cannam@89: cannam@89: typedef struct cannam@89: { cannam@89: double left_phase; cannam@89: double right_phase; cannam@89: volatile PaTime outTime; cannam@89: } cannam@89: paTestData; cannam@89: cannam@89: /* This routine will be called by the PortAudio engine when audio is needed. cannam@89: ** It may called at interrupt level on some machines so don't do anything cannam@89: ** that could mess up the system like calling malloc() or free(). cannam@89: */ cannam@89: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@89: unsigned long framesPerBuffer, cannam@89: const PaStreamCallbackTimeInfo* timeInfo, cannam@89: PaStreamCallbackFlags statusFlags, cannam@89: void *userData ) cannam@89: { cannam@89: paTestData *data = (paTestData*)userData; cannam@89: float *out = (float*)outputBuffer; cannam@89: unsigned int i; cannam@89: cannam@89: double left_phaseInc = 0.02; cannam@89: double right_phaseInc = 0.06; cannam@89: cannam@89: double left_phase = data->left_phase; cannam@89: double right_phase = data->right_phase; cannam@89: cannam@89: (void) statusFlags; /* Prevent unused variable warnings. */ cannam@89: (void) inputBuffer; cannam@89: cannam@89: data->outTime = timeInfo->outputBufferDacTime; cannam@89: cannam@89: for( i=0; i TWOPI ) left_phase -= TWOPI; cannam@89: *out++ = (float) sin( left_phase ); cannam@89: cannam@89: right_phase += right_phaseInc; cannam@89: if( right_phase > TWOPI ) right_phase -= TWOPI; cannam@89: *out++ = (float) sin( right_phase ); cannam@89: } cannam@89: cannam@89: data->left_phase = left_phase; cannam@89: data->right_phase = right_phase; cannam@89: cannam@89: return paContinue; cannam@89: } cannam@89: cannam@89: /*******************************************************************/ cannam@89: static void ReportStreamTime( PaStream *stream, paTestData *data ); cannam@89: static void ReportStreamTime( PaStream *stream, paTestData *data ) cannam@89: { cannam@89: PaTime streamTime, latency, outTime; cannam@89: cannam@89: streamTime = Pa_GetStreamTime( stream ); cannam@89: outTime = data->outTime; cannam@89: if( outTime < 0.0 ) cannam@89: { cannam@89: printf("Stream time = %8.1f\n", streamTime ); cannam@89: } cannam@89: else cannam@89: { cannam@89: latency = outTime - streamTime; cannam@89: printf("Stream time = %8.4f, outTime = %8.4f, latency = %8.4f\n", cannam@89: streamTime, outTime, latency ); cannam@89: } cannam@89: fflush(stdout); cannam@89: } cannam@89: cannam@89: /*******************************************************************/ cannam@89: int main(void); cannam@89: int main(void) cannam@89: { cannam@89: PaStreamParameters outputParameters; cannam@89: PaStream *stream; cannam@89: PaError err; cannam@89: paTestData data; cannam@89: PaTime startTime; cannam@89: cannam@89: printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); cannam@89: cannam@89: data.left_phase = data.right_phase = 0; cannam@89: cannam@89: err = Pa_Initialize(); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ cannam@89: if (outputParameters.device == paNoDevice) { cannam@89: fprintf(stderr,"Error: No default output device.\n"); cannam@89: goto error; cannam@89: } cannam@89: outputParameters.channelCount = 2; /* stereo output */ cannam@89: outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ cannam@89: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; cannam@89: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@89: cannam@89: err = Pa_OpenStream( cannam@89: &stream, cannam@89: NULL, /* no input */ cannam@89: &outputParameters, cannam@89: SAMPLE_RATE, cannam@89: FRAMES_PER_BUFFER, cannam@89: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@89: patestCallback, cannam@89: &data ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: /* Watch until sound is halfway finished. */ cannam@89: printf("Play for %d seconds.\n", NUM_SECONDS/2 ); fflush(stdout); cannam@89: cannam@89: data.outTime = -1.0; /* mark time for callback as undefined */ cannam@89: err = Pa_StartStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: startTime = Pa_GetStreamTime( stream ); cannam@89: cannam@89: do cannam@89: { cannam@89: ReportStreamTime( stream, &data ); cannam@89: Pa_Sleep(100); cannam@89: } while( (Pa_GetStreamTime( stream ) - startTime) < (NUM_SECONDS/2) ); cannam@89: cannam@89: /* Stop sound for 2 seconds. */ cannam@89: err = Pa_StopStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: printf("Pause for 2 seconds.\n"); fflush(stdout); cannam@89: Pa_Sleep( 2000 ); cannam@89: cannam@89: data.outTime = -1.0; /* mark time for callback as undefined */ cannam@89: err = Pa_StartStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: startTime = Pa_GetStreamTime( stream ); cannam@89: cannam@89: printf("Play until sound is finished.\n"); fflush(stdout); cannam@89: do cannam@89: { cannam@89: ReportStreamTime( stream, &data ); cannam@89: Pa_Sleep(100); cannam@89: } while( (Pa_GetStreamTime( stream ) - startTime) < (NUM_SECONDS/2) ); cannam@89: cannam@89: err = Pa_CloseStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: Pa_Terminate(); cannam@89: printf("Test finished.\n"); cannam@89: return err; cannam@89: cannam@89: error: cannam@89: Pa_Terminate(); cannam@89: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@89: fprintf( stderr, "Error number: %d\n", err ); cannam@89: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@89: return err; cannam@89: }