initial commit
This commit is contained in:
189
tools/tracker/packages/portaudio/test/patest_latency.c
Normal file
189
tools/tracker/packages/portaudio/test/patest_latency.c
Normal file
@@ -0,0 +1,189 @@
|
||||
/** @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: patest_latency.c 1097 2006-08-26 08:27:53Z rossb $
|
||||
*
|
||||
* 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;
|
||||
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 occured while using the portaudio stream\n" );
|
||||
fprintf( stderr, "Error number: %d\n", err );
|
||||
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
|
||||
return err;
|
||||
}
|
||||
Reference in New Issue
Block a user