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Diffstat (limited to 'portaudio/test/patest_latency.c')
| -rw-r--r-- | portaudio/test/patest_latency.c | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/portaudio/test/patest_latency.c b/portaudio/test/patest_latency.c deleted file mode 100644 index 7f622c1..0000000 --- a/portaudio/test/patest_latency.c +++ /dev/null @@ -1,193 +0,0 @@ -/** @file - @ingroup test_src - @brief Hear the latency caused by big buffers. - Play a sine wave and change frequency based on letter input. - @author Phil Burk <philburk@softsynth.com>, and Darren Gibbs -*/ -/* - * $Id$ - * - * This program uses the PortAudio Portable Audio Library. - * For more information see: http://www.portaudio.com - * Copyright (c) 1999-2000 Ross Bencina and Phil Burk - * - * Permission is hereby granted, free of charge, to any person obtaining - * a copy of this software and associated documentation files - * (the "Software"), to deal in the Software without restriction, - * including without limitation the rights to use, copy, modify, merge, - * publish, distribute, sublicense, and/or sell copies of the Software, - * and to permit persons to whom the Software is furnished to do so, - * subject to the following conditions: - * - * The above copyright notice and this permission notice shall be - * included in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. - * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR - * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF - * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION - * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - */ - -/* - * The text above constitutes the entire PortAudio license; however, - * the PortAudio community also makes the following non-binding requests: - * - * Any person wishing to distribute modifications to the Software is - * requested to send the modifications to the original developer so that - * they can be incorporated into the canonical version. It is also - * requested that these non-binding requests be included along with the - * license above. - */ - -#include <stdio.h> -#include <math.h> -#include "portaudio.h" - -#define OUTPUT_DEVICE (Pa_GetDefaultOutputDevice()) -#define SAMPLE_RATE (44100) -#define FRAMES_PER_BUFFER (64) - -#define MIN_FREQ (100.0f) -#define CalcPhaseIncrement(freq) ((freq)/SAMPLE_RATE) -#ifndef M_PI -#define M_PI (3.14159265) -#endif -#define TABLE_SIZE (400) - -typedef struct -{ - float sine[TABLE_SIZE + 1]; /* add one for guard point for interpolation */ - float phase_increment; - float left_phase; - float right_phase; -} -paTestData; - -float LookupSine( paTestData *data, float phase ); -/* Convert phase between and 1.0 to sine value - * using linear interpolation. - */ -float LookupSine( paTestData *data, float phase ) -{ - float fIndex = phase*TABLE_SIZE; - int index = (int) fIndex; - float fract = fIndex - index; - float lo = data->sine[index]; - float hi = data->sine[index+1]; - float val = lo + fract*(hi-lo); - return val; -} - -/* This routine will be called by the PortAudio engine when audio is needed. -** It may called at interrupt level on some machines so don't do anything -** that could mess up the system like calling malloc() or free(). -*/ -static int patestCallback( const void *inputBuffer, void *outputBuffer, - unsigned long framesPerBuffer, - const PaStreamCallbackTimeInfo* timeInfo, - PaStreamCallbackFlags statusFlags, - void *userData ) -{ - paTestData *data = (paTestData*)userData; - float *out = (float*)outputBuffer; - int i; - - (void) inputBuffer; /* Prevent unused variable warning. */ - - for( i=0; i<framesPerBuffer; i++ ) - { - *out++ = LookupSine(data, data->left_phase); /* left */ - *out++ = LookupSine(data, data->right_phase); /* right */ - data->left_phase += data->phase_increment; - if( data->left_phase >= 1.0f ) data->left_phase -= 1.0f; - data->right_phase += (data->phase_increment * 1.5f); /* fifth above */ - if( data->right_phase >= 1.0f ) data->right_phase -= 1.0f; - } - return 0; -} - -/*******************************************************************/ -int main(void); -int main(void) -{ - PaStream *stream; - PaStreamParameters outputParameters; - PaError err; - paTestData data; - int i; - int done = 0; - - printf("PortAudio Test: enter letter then hit ENTER.\n" ); - /* initialise sinusoidal wavetable */ - for( i=0; i<TABLE_SIZE; i++ ) - { - data.sine[i] = 0.90f * (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); - } - data.sine[TABLE_SIZE] = data.sine[0]; /* set guard point. */ - data.left_phase = data.right_phase = 0.0; - data.phase_increment = CalcPhaseIncrement(MIN_FREQ); - - err = Pa_Initialize(); - if( err != paNoError ) goto error; - printf("PortAudio Test: output device = %d\n", OUTPUT_DEVICE ); - - outputParameters.device = OUTPUT_DEVICE; - if (outputParameters.device == paNoDevice) { - fprintf(stderr,"Error: No default output device.\n"); - goto error; - } - outputParameters.channelCount = 2; /* stereo output */ - outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ - outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; - outputParameters.hostApiSpecificStreamInfo = NULL; - - printf("Requested output latency = %.4f seconds.\n", outputParameters.suggestedLatency ); - printf("%d frames per buffer.\n.", FRAMES_PER_BUFFER ); - - err = Pa_OpenStream( - &stream, - NULL, /* no input */ - &outputParameters, - SAMPLE_RATE, - FRAMES_PER_BUFFER, - paClipOff|paDitherOff, /* we won't output out of range samples so don't bother clipping them */ - patestCallback, - &data ); - if( err != paNoError ) goto error; - - err = Pa_StartStream( stream ); - if( err != paNoError ) goto error; - printf("Play ASCII keyboard. Hit 'q' to stop. (Use RETURN key on Mac)\n"); - fflush(stdout); - while ( !done ) - { - float freq; - int index; - char c; - do - { - c = getchar(); - } - while( c < ' '); /* Strip white space and control chars. */ - - if( c == 'q' ) done = 1; - index = c % 26; - freq = MIN_FREQ + (index * 40.0); - data.phase_increment = CalcPhaseIncrement(freq); - } - printf("Call Pa_StopStream()\n"); - err = Pa_StopStream( stream ); - if( err != paNoError ) goto error; - Pa_Terminate(); - printf("Test finished.\n"); - return err; -error: - Pa_Terminate(); - fprintf( stderr, "An error occurred while using the portaudio stream\n" ); - fprintf( stderr, "Error number: %d\n", err ); - fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); - return err; -} |