cannam@124: /** @file cannam@124: @ingroup test_src cannam@124: @brief Hear the latency caused by big buffers. cannam@124: Play a sine wave and change frequency based on letter input. cannam@124: @author Phil Burk , and Darren Gibbs cannam@124: */ cannam@124: /* cannam@124: * $Id: patest_latency.c 1368 2008-03-01 00:38:27Z rossb $ cannam@124: * cannam@124: * This program uses the PortAudio Portable Audio Library. cannam@124: * For more information see: http://www.portaudio.com cannam@124: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@124: * cannam@124: * Permission is hereby granted, free of charge, to any person obtaining cannam@124: * a copy of this software and associated documentation files cannam@124: * (the "Software"), to deal in the Software without restriction, cannam@124: * including without limitation the rights to use, copy, modify, merge, cannam@124: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@124: * and to permit persons to whom the Software is furnished to do so, cannam@124: * subject to the following conditions: cannam@124: * cannam@124: * The above copyright notice and this permission notice shall be cannam@124: * included in all copies or substantial portions of the Software. cannam@124: * cannam@124: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@124: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@124: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@124: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@124: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@124: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@124: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@124: */ cannam@124: cannam@124: /* cannam@124: * The text above constitutes the entire PortAudio license; however, cannam@124: * the PortAudio community also makes the following non-binding requests: cannam@124: * cannam@124: * Any person wishing to distribute modifications to the Software is cannam@124: * requested to send the modifications to the original developer so that cannam@124: * they can be incorporated into the canonical version. It is also cannam@124: * requested that these non-binding requests be included along with the cannam@124: * license above. cannam@124: */ cannam@124: cannam@124: #include cannam@124: #include cannam@124: #include "portaudio.h" cannam@124: cannam@124: #define OUTPUT_DEVICE (Pa_GetDefaultOutputDevice()) cannam@124: #define SAMPLE_RATE (44100) cannam@124: #define FRAMES_PER_BUFFER (64) cannam@124: cannam@124: #define MIN_FREQ (100.0f) cannam@124: #define CalcPhaseIncrement(freq) ((freq)/SAMPLE_RATE) cannam@124: #ifndef M_PI cannam@124: #define M_PI (3.14159265) cannam@124: #endif cannam@124: #define TABLE_SIZE (400) cannam@124: cannam@124: typedef struct cannam@124: { cannam@124: float sine[TABLE_SIZE + 1]; /* add one for guard point for interpolation */ cannam@124: float phase_increment; cannam@124: float left_phase; cannam@124: float right_phase; cannam@124: } cannam@124: paTestData; cannam@124: cannam@124: float LookupSine( paTestData *data, float phase ); cannam@124: /* Convert phase between and 1.0 to sine value cannam@124: * using linear interpolation. cannam@124: */ cannam@124: float LookupSine( paTestData *data, float phase ) cannam@124: { cannam@124: float fIndex = phase*TABLE_SIZE; cannam@124: int index = (int) fIndex; cannam@124: float fract = fIndex - index; cannam@124: float lo = data->sine[index]; cannam@124: float hi = data->sine[index+1]; cannam@124: float val = lo + fract*(hi-lo); cannam@124: return val; cannam@124: } cannam@124: cannam@124: /* This routine will be called by the PortAudio engine when audio is needed. cannam@124: ** It may called at interrupt level on some machines so don't do anything cannam@124: ** that could mess up the system like calling malloc() or free(). cannam@124: */ cannam@124: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@124: unsigned long framesPerBuffer, cannam@124: const PaStreamCallbackTimeInfo* timeInfo, cannam@124: PaStreamCallbackFlags statusFlags, cannam@124: void *userData ) cannam@124: { cannam@124: paTestData *data = (paTestData*)userData; cannam@124: float *out = (float*)outputBuffer; cannam@124: int i; cannam@124: cannam@124: (void) inputBuffer; /* Prevent unused variable warning. */ cannam@124: cannam@124: for( i=0; ileft_phase); /* left */ cannam@124: *out++ = LookupSine(data, data->right_phase); /* right */ cannam@124: data->left_phase += data->phase_increment; cannam@124: if( data->left_phase >= 1.0f ) data->left_phase -= 1.0f; cannam@124: data->right_phase += (data->phase_increment * 1.5f); /* fifth above */ cannam@124: if( data->right_phase >= 1.0f ) data->right_phase -= 1.0f; cannam@124: } cannam@124: return 0; cannam@124: } cannam@124: cannam@124: /*******************************************************************/ cannam@124: int main(void); cannam@124: int main(void) cannam@124: { cannam@124: PaStream *stream; cannam@124: PaStreamParameters outputParameters; cannam@124: PaError err; cannam@124: paTestData data; cannam@124: int i; cannam@124: int done = 0; cannam@124: cannam@124: printf("PortAudio Test: enter letter then hit ENTER.\n" ); cannam@124: /* initialise sinusoidal wavetable */ cannam@124: for( i=0; idefaultLowOutputLatency; cannam@124: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@124: cannam@124: printf("Requested output latency = %.4f seconds.\n", outputParameters.suggestedLatency ); cannam@124: printf("%d frames per buffer.\n.", FRAMES_PER_BUFFER ); cannam@124: cannam@124: err = Pa_OpenStream( cannam@124: &stream, cannam@124: NULL, /* no input */ cannam@124: &outputParameters, cannam@124: SAMPLE_RATE, cannam@124: FRAMES_PER_BUFFER, cannam@124: paClipOff|paDitherOff, /* we won't output out of range samples so don't bother clipping them */ cannam@124: patestCallback, cannam@124: &data ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: err = Pa_StartStream( stream ); cannam@124: if( err != paNoError ) goto error; cannam@124: printf("Play ASCII keyboard. Hit 'q' to stop. (Use RETURN key on Mac)\n"); cannam@124: fflush(stdout); cannam@124: while ( !done ) cannam@124: { cannam@124: float freq; cannam@124: int index; cannam@124: char c; cannam@124: do cannam@124: { cannam@124: c = getchar(); cannam@124: } cannam@124: while( c < ' '); /* Strip white space and control chars. */ cannam@124: cannam@124: if( c == 'q' ) done = 1; cannam@124: index = c % 26; cannam@124: freq = MIN_FREQ + (index * 40.0); cannam@124: data.phase_increment = CalcPhaseIncrement(freq); cannam@124: } cannam@124: printf("Call Pa_StopStream()\n"); cannam@124: err = Pa_StopStream( stream ); cannam@124: if( err != paNoError ) goto error; cannam@124: Pa_Terminate(); cannam@124: printf("Test finished.\n"); cannam@124: return err; cannam@124: error: cannam@124: Pa_Terminate(); cannam@124: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@124: fprintf( stderr, "Error number: %d\n", err ); cannam@124: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@124: return err; cannam@124: }