275 lines
8.7 KiB
C
275 lines
8.7 KiB
C
/*
|
|
* $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;
|
|
}
|
|
|