cannam@89: /** @file cannam@89: @ingroup test_src cannam@89: @brief Hear the latency caused by big buffers. cannam@89: Play a sine wave and change frequency based on letter input. cannam@89: @author Phil Burk , and Darren Gibbs cannam@89: */ cannam@89: /* cannam@89: * $Id: patest_latency.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: cannam@89: #include cannam@89: #include cannam@89: #include "portaudio.h" cannam@89: cannam@89: #define OUTPUT_DEVICE (Pa_GetDefaultOutputDevice()) cannam@89: #define SAMPLE_RATE (44100) cannam@89: #define FRAMES_PER_BUFFER (64) cannam@89: cannam@89: #define MIN_FREQ (100.0f) cannam@89: #define CalcPhaseIncrement(freq) ((freq)/SAMPLE_RATE) cannam@89: #ifndef M_PI cannam@89: #define M_PI (3.14159265) cannam@89: #endif cannam@89: #define TABLE_SIZE (400) cannam@89: cannam@89: typedef struct cannam@89: { cannam@89: float sine[TABLE_SIZE + 1]; /* add one for guard point for interpolation */ cannam@89: float phase_increment; cannam@89: float left_phase; cannam@89: float right_phase; cannam@89: } cannam@89: paTestData; cannam@89: cannam@89: float LookupSine( paTestData *data, float phase ); cannam@89: /* Convert phase between and 1.0 to sine value cannam@89: * using linear interpolation. cannam@89: */ cannam@89: float LookupSine( paTestData *data, float phase ) cannam@89: { cannam@89: float fIndex = phase*TABLE_SIZE; cannam@89: int index = (int) fIndex; cannam@89: float fract = fIndex - index; cannam@89: float lo = data->sine[index]; cannam@89: float hi = data->sine[index+1]; cannam@89: float val = lo + fract*(hi-lo); cannam@89: return val; cannam@89: } 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: int i; cannam@89: cannam@89: (void) inputBuffer; /* Prevent unused variable warning. */ cannam@89: cannam@89: for( i=0; ileft_phase); /* left */ cannam@89: *out++ = LookupSine(data, data->right_phase); /* right */ cannam@89: data->left_phase += data->phase_increment; cannam@89: if( data->left_phase >= 1.0f ) data->left_phase -= 1.0f; cannam@89: data->right_phase += (data->phase_increment * 1.5f); /* fifth above */ cannam@89: if( data->right_phase >= 1.0f ) data->right_phase -= 1.0f; cannam@89: } cannam@89: return 0; cannam@89: } cannam@89: cannam@89: /*******************************************************************/ cannam@89: int main(void); cannam@89: int main(void) cannam@89: { cannam@89: PaStream *stream; cannam@89: PaStreamParameters outputParameters; cannam@89: PaError err; cannam@89: paTestData data; cannam@89: int i; cannam@89: int done = 0; cannam@89: cannam@89: printf("PortAudio Test: enter letter then hit ENTER.\n" ); cannam@89: /* initialise sinusoidal wavetable */ cannam@89: for( i=0; idefaultLowOutputLatency; cannam@89: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@89: cannam@89: printf("Requested output latency = %.4f seconds.\n", outputParameters.suggestedLatency ); cannam@89: printf("%d frames per buffer.\n.", FRAMES_PER_BUFFER ); 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|paDitherOff, /* 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: err = Pa_StartStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: printf("Play ASCII keyboard. Hit 'q' to stop. (Use RETURN key on Mac)\n"); cannam@89: fflush(stdout); cannam@89: while ( !done ) cannam@89: { cannam@89: float freq; cannam@89: int index; cannam@89: char c; cannam@89: do cannam@89: { cannam@89: c = getchar(); cannam@89: } cannam@89: while( c < ' '); /* Strip white space and control chars. */ cannam@89: cannam@89: if( c == 'q' ) done = 1; cannam@89: index = c % 26; cannam@89: freq = MIN_FREQ + (index * 40.0); cannam@89: data.phase_increment = CalcPhaseIncrement(freq); cannam@89: } cannam@89: printf("Call Pa_StopStream()\n"); cannam@89: err = Pa_StopStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: Pa_Terminate(); cannam@89: printf("Test finished.\n"); cannam@89: return err; 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: }