initial implementation of patest_wmme_find_best_latency_params.c. just a draft. needs work
This commit is contained in:
rossb
parent
20f5792a19
commit
6f7f5f0325
1 changed files with 275 additions and 0 deletions
275
test/patest_wmme_find_best_latency_params.c
Normal file
275
test/patest_wmme_find_best_latency_params.c
Normal file
|
|
@ -0,0 +1,275 @@
|
|||
/*
|
||||
* $Id: $
|
||||
* Portable Audio I/O Library
|
||||
* Windows MME low level buffer parameters search
|
||||
*
|
||||
* Copyright (c) 2010 Ross Bencina
|
||||
*
|
||||
* 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 <windows.h> /* required when using pa_win_wmme.h */
|
||||
#include <mmsystem.h> /* required when using pa_win_wmme.h */
|
||||
|
||||
#include <conio.h> /* for _getch */
|
||||
|
||||
|
||||
#include "portaudio.h"
|
||||
#include "pa_win_wmme.h"
|
||||
|
||||
|
||||
#define SAMPLE_RATE (22050)
|
||||
|
||||
#ifndef M_PI
|
||||
#define M_PI (3.14159265)
|
||||
#endif
|
||||
|
||||
#define TABLE_SIZE (2048)
|
||||
|
||||
#define CHANNEL_COUNT (2)
|
||||
|
||||
|
||||
typedef struct
|
||||
{
|
||||
float sine[TABLE_SIZE];
|
||||
double phase;
|
||||
}
|
||||
paTestData;
|
||||
|
||||
static paTestData data;
|
||||
|
||||
/* 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;
|
||||
unsigned long i,j;
|
||||
|
||||
(void) timeInfo; /* Prevent unused variable warnings. */
|
||||
(void) statusFlags;
|
||||
(void) inputBuffer;
|
||||
|
||||
for( i=0; i<framesPerBuffer; i++ )
|
||||
{
|
||||
float x = data->sine[(int)data->phase];
|
||||
data->phase += 20;
|
||||
if( data->phase >= TABLE_SIZE ){
|
||||
data->phase -= TABLE_SIZE;
|
||||
}
|
||||
|
||||
for( j = 0; j < CHANNEL_COUNT; ++j ){
|
||||
*out++ = x;
|
||||
}
|
||||
}
|
||||
|
||||
return paContinue;
|
||||
}
|
||||
|
||||
|
||||
#define YES 1
|
||||
#define NO 0
|
||||
|
||||
|
||||
static int playUntilKeyPress( int deviceIndex, int framesPerUserBuffer, int framesPerWmmeBuffer, int wmmeBufferCount )
|
||||
{
|
||||
PaStreamParameters outputParameters;
|
||||
PaWinMmeStreamInfo wmmeStreamInfo;
|
||||
PaStream *stream;
|
||||
PaError err;
|
||||
int c;
|
||||
|
||||
outputParameters.device = deviceIndex;
|
||||
outputParameters.channelCount = CHANNEL_COUNT;
|
||||
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point processing */
|
||||
outputParameters.suggestedLatency = 0; /*Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;*/
|
||||
outputParameters.hostApiSpecificStreamInfo = NULL;
|
||||
|
||||
wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo);
|
||||
wmmeStreamInfo.hostApiType = paMME;
|
||||
wmmeStreamInfo.version = 1;
|
||||
wmmeStreamInfo.flags = paWinMmeUseLowLevelLatencyParameters | paWinMmeDontThrottleOverloadedProcessingThread;
|
||||
wmmeStreamInfo.framesPerBuffer = framesPerWmmeBuffer;
|
||||
wmmeStreamInfo.bufferCount = wmmeBufferCount;
|
||||
outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo;
|
||||
|
||||
err = Pa_OpenStream(
|
||||
&stream,
|
||||
NULL, /* no input */
|
||||
&outputParameters,
|
||||
SAMPLE_RATE,
|
||||
framesPerUserBuffer,
|
||||
paClipOff | paPrimeOutputBuffersUsingStreamCallback, /* 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;
|
||||
|
||||
|
||||
do{
|
||||
printf( "Trying buffer size %d.\nIf it sounds smooth press 'y', if it sounds bad press 'n'\n", framesPerWmmeBuffer );
|
||||
c = tolower(_getch());
|
||||
}while( c != 'y' && c != 'n' );
|
||||
|
||||
err = Pa_AbortStream( stream );
|
||||
if( err != paNoError ) goto error;
|
||||
|
||||
err = Pa_CloseStream( stream );
|
||||
if( err != paNoError ) goto error;
|
||||
|
||||
return (c == 'y') ? YES : NO;
|
||||
|
||||
error:
|
||||
return err;
|
||||
}
|
||||
|
||||
|
||||
/*******************************************************************/
|
||||
int main(int argc, char* argv[])
|
||||
{
|
||||
PaError err;
|
||||
int i;
|
||||
int deviceIndex;
|
||||
int wmmeBufferCount, wmmeBufferSize, smallestWorkingBufferSize;
|
||||
int min, max, mid;
|
||||
int testResult;
|
||||
FILE *resultsFp;
|
||||
OSVERSIONINFO windowsVersion;
|
||||
|
||||
err = Pa_Initialize();
|
||||
if( err != paNoError ) goto error;
|
||||
|
||||
/*
|
||||
TODO: print an index of devices and ask the user to select one
|
||||
|
||||
*/
|
||||
|
||||
deviceIndex = Pa_GetHostApiInfo( Pa_HostApiTypeIdToHostApiIndex( paMME ) )->defaultOutputDevice;
|
||||
if( argc == 2 ){
|
||||
sscanf( argv[1], "%d", &deviceIndex );
|
||||
}
|
||||
|
||||
printf( "using device id %d (%s)\n", deviceIndex, Pa_GetDeviceInfo(deviceIndex)->name );
|
||||
|
||||
/* initialise sinusoidal wavetable */
|
||||
for( i=0; i<TABLE_SIZE; i++ )
|
||||
{
|
||||
data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
|
||||
}
|
||||
|
||||
data.phase = 0;
|
||||
|
||||
|
||||
resultsFp = fopen( "results.txt", "at" );
|
||||
fprintf( resultsFp, "*** WMME smallest working buffer sizes\n" );
|
||||
|
||||
memset( &windowsVersion, 0, sizeof(OSVERSIONINFO) );
|
||||
windowsVersion.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
|
||||
GetVersionEx( &windowsVersion );
|
||||
|
||||
fprintf( resultsFp, "windows version: %d.%d.%d %S\n", windowsVersion.dwMajorVersion, windowsVersion.dwMinorVersion, windowsVersion.dwBuildNumber, windowsVersion.szCSDVersion );
|
||||
fprintf( resultsFp, "audio device: %s\n", Pa_GetDeviceInfo( deviceIndex )->name );
|
||||
|
||||
|
||||
/*
|
||||
TODO: test at 22050 44100, 48000, 96000, mono and stereo and surround
|
||||
|
||||
TODO: should be testing with 80% CPU load
|
||||
|
||||
|
||||
another thing to try would be setting the timeBeginPeriod granularity to 1ms and see if it changes the behavior
|
||||
*/
|
||||
|
||||
printf( "testing with sample rate %f.\n", (float)SAMPLE_RATE );
|
||||
fprintf( resultsFp, "sample rate: %f\n", (float)SAMPLE_RATE );
|
||||
fprintf( resultsFp, "buffer count, smallest working size (frames)\n" );
|
||||
|
||||
for( wmmeBufferCount = 2; wmmeBufferCount < 13; ++wmmeBufferCount ){
|
||||
|
||||
|
||||
printf( "testing with %d buffers...\n", wmmeBufferCount );
|
||||
|
||||
/*
|
||||
Binary search after Niklaus Wirth
|
||||
from http://en.wikipedia.org/wiki/Binary_search_algorithm#The_algorithm
|
||||
*/
|
||||
min = 1;
|
||||
max = 8192; /* we assume that this size works */
|
||||
smallestWorkingBufferSize = 0;
|
||||
|
||||
do{
|
||||
mid = min + ((max - min) / 2);
|
||||
|
||||
wmmeBufferSize = mid;
|
||||
testResult = playUntilKeyPress( deviceIndex, wmmeBufferSize, wmmeBufferSize, wmmeBufferCount );
|
||||
|
||||
if( testResult == YES ){
|
||||
max = mid - 1;
|
||||
smallestWorkingBufferSize = wmmeBufferSize;
|
||||
}else{
|
||||
min = mid + 1;
|
||||
}
|
||||
|
||||
}while( (min <= max) && (testResult == YES || testResult == NO) );
|
||||
|
||||
printf( "smallest working buffer size for %d buffers is: %d\n", wmmeBufferCount, smallestWorkingBufferSize );
|
||||
|
||||
fprintf( resultsFp, "%d, %d\n", wmmeBufferCount, smallestWorkingBufferSize );
|
||||
fflush( resultsFp );
|
||||
}
|
||||
|
||||
fprintf( resultsFp, "###\n" );
|
||||
|
||||
fclose( resultsFp );
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
Loading…
Reference in a new issue