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-rw-r--r--portaudio/test/patest_latency.c193
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diff --git a/portaudio/test/patest_latency.c b/portaudio/test/patest_latency.c
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-/** @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;
-}
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