Chris@4: /** @file Chris@4: @ingroup test_src Chris@4: @brief Hear the latency caused by big buffers. Chris@4: Play a sine wave and change frequency based on letter input. Chris@4: @author Phil Burk , and Darren Gibbs Chris@4: */ Chris@4: /* Chris@4: * $Id: patest_latency.c 1368 2008-03-01 00:38:27Z rossb $ Chris@4: * Chris@4: * This program uses the PortAudio Portable Audio Library. Chris@4: * For more information see: http://www.portaudio.com Chris@4: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk Chris@4: * Chris@4: * Permission is hereby granted, free of charge, to any person obtaining Chris@4: * a copy of this software and associated documentation files Chris@4: * (the "Software"), to deal in the Software without restriction, Chris@4: * including without limitation the rights to use, copy, modify, merge, Chris@4: * publish, distribute, sublicense, and/or sell copies of the Software, Chris@4: * and to permit persons to whom the Software is furnished to do so, Chris@4: * subject to the following conditions: Chris@4: * Chris@4: * The above copyright notice and this permission notice shall be Chris@4: * included in all copies or substantial portions of the Software. Chris@4: * Chris@4: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, Chris@4: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF Chris@4: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. Chris@4: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR Chris@4: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF Chris@4: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION Chris@4: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Chris@4: */ Chris@4: Chris@4: /* Chris@4: * The text above constitutes the entire PortAudio license; however, Chris@4: * the PortAudio community also makes the following non-binding requests: Chris@4: * Chris@4: * Any person wishing to distribute modifications to the Software is Chris@4: * requested to send the modifications to the original developer so that Chris@4: * they can be incorporated into the canonical version. It is also Chris@4: * requested that these non-binding requests be included along with the Chris@4: * license above. Chris@4: */ Chris@4: Chris@4: #include Chris@4: #include Chris@4: #include "portaudio.h" Chris@4: Chris@4: #define OUTPUT_DEVICE (Pa_GetDefaultOutputDevice()) Chris@4: #define SAMPLE_RATE (44100) Chris@4: #define FRAMES_PER_BUFFER (64) Chris@4: Chris@4: #define MIN_FREQ (100.0f) Chris@4: #define CalcPhaseIncrement(freq) ((freq)/SAMPLE_RATE) Chris@4: #ifndef M_PI Chris@4: #define M_PI (3.14159265) Chris@4: #endif Chris@4: #define TABLE_SIZE (400) Chris@4: Chris@4: typedef struct Chris@4: { Chris@4: float sine[TABLE_SIZE + 1]; /* add one for guard point for interpolation */ Chris@4: float phase_increment; Chris@4: float left_phase; Chris@4: float right_phase; Chris@4: } Chris@4: paTestData; Chris@4: Chris@4: float LookupSine( paTestData *data, float phase ); Chris@4: /* Convert phase between and 1.0 to sine value Chris@4: * using linear interpolation. Chris@4: */ Chris@4: float LookupSine( paTestData *data, float phase ) Chris@4: { Chris@4: float fIndex = phase*TABLE_SIZE; Chris@4: int index = (int) fIndex; Chris@4: float fract = fIndex - index; Chris@4: float lo = data->sine[index]; Chris@4: float hi = data->sine[index+1]; Chris@4: float val = lo + fract*(hi-lo); Chris@4: return val; Chris@4: } Chris@4: Chris@4: /* This routine will be called by the PortAudio engine when audio is needed. Chris@4: ** It may called at interrupt level on some machines so don't do anything Chris@4: ** that could mess up the system like calling malloc() or free(). Chris@4: */ Chris@4: static int patestCallback( const void *inputBuffer, void *outputBuffer, Chris@4: unsigned long framesPerBuffer, Chris@4: const PaStreamCallbackTimeInfo* timeInfo, Chris@4: PaStreamCallbackFlags statusFlags, Chris@4: void *userData ) Chris@4: { Chris@4: paTestData *data = (paTestData*)userData; Chris@4: float *out = (float*)outputBuffer; Chris@4: int i; Chris@4: Chris@4: (void) inputBuffer; /* Prevent unused variable warning. */ Chris@4: Chris@4: for( i=0; ileft_phase); /* left */ Chris@4: *out++ = LookupSine(data, data->right_phase); /* right */ Chris@4: data->left_phase += data->phase_increment; Chris@4: if( data->left_phase >= 1.0f ) data->left_phase -= 1.0f; Chris@4: data->right_phase += (data->phase_increment * 1.5f); /* fifth above */ Chris@4: if( data->right_phase >= 1.0f ) data->right_phase -= 1.0f; Chris@4: } Chris@4: return 0; Chris@4: } Chris@4: Chris@4: /*******************************************************************/ Chris@4: int main(void); Chris@4: int main(void) Chris@4: { Chris@4: PaStream *stream; Chris@4: PaStreamParameters outputParameters; Chris@4: PaError err; Chris@4: paTestData data; Chris@4: int i; Chris@4: int done = 0; Chris@4: Chris@4: printf("PortAudio Test: enter letter then hit ENTER.\n" ); Chris@4: /* initialise sinusoidal wavetable */ Chris@4: for( i=0; idefaultLowOutputLatency; Chris@4: outputParameters.hostApiSpecificStreamInfo = NULL; Chris@4: Chris@4: printf("Requested output latency = %.4f seconds.\n", outputParameters.suggestedLatency ); Chris@4: printf("%d frames per buffer.\n.", FRAMES_PER_BUFFER ); Chris@4: Chris@4: err = Pa_OpenStream( Chris@4: &stream, Chris@4: NULL, /* no input */ Chris@4: &outputParameters, Chris@4: SAMPLE_RATE, Chris@4: FRAMES_PER_BUFFER, Chris@4: paClipOff|paDitherOff, /* we won't output out of range samples so don't bother clipping them */ Chris@4: patestCallback, Chris@4: &data ); Chris@4: if( err != paNoError ) goto error; Chris@4: Chris@4: err = Pa_StartStream( stream ); Chris@4: if( err != paNoError ) goto error; Chris@4: printf("Play ASCII keyboard. Hit 'q' to stop. (Use RETURN key on Mac)\n"); Chris@4: fflush(stdout); Chris@4: while ( !done ) Chris@4: { Chris@4: float freq; Chris@4: int index; Chris@4: char c; Chris@4: do Chris@4: { Chris@4: c = getchar(); Chris@4: } Chris@4: while( c < ' '); /* Strip white space and control chars. */ Chris@4: Chris@4: if( c == 'q' ) done = 1; Chris@4: index = c % 26; Chris@4: freq = MIN_FREQ + (index * 40.0); Chris@4: data.phase_increment = CalcPhaseIncrement(freq); Chris@4: } Chris@4: printf("Call Pa_StopStream()\n"); Chris@4: err = Pa_StopStream( stream ); Chris@4: if( err != paNoError ) goto error; Chris@4: Pa_Terminate(); Chris@4: printf("Test finished.\n"); Chris@4: return err; Chris@4: error: Chris@4: Pa_Terminate(); Chris@4: fprintf( stderr, "An error occured while using the portaudio stream\n" ); Chris@4: fprintf( stderr, "Error number: %d\n", err ); Chris@4: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); Chris@4: return err; Chris@4: }