gearmulator

patest_wmme_low_level_latency_params.c (6419B)

---

 /*
  * $Id: $
  * Portable Audio I/O Library
  * Windows MME low level buffer parameters test
  *
  * Copyright (c) 2007 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 "portaudio.h"
 #include "pa_win_wmme.h"
 
 #define NUM_SECONDS         (6)
 #define SAMPLE_RATE         (44100)
 
 #define WMME_FRAMES_PER_BUFFER  (440)
 #define WMME_BUFFER_COUNT       (6)
 
 #define FRAMES_PER_BUFFER   WMME_FRAMES_PER_BUFFER /* hardwire portaudio callback buffer size to WMME buffer size for this test */
 
 #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;
 
 /* 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;
 }
 
 /*******************************************************************/
 int main(int argc, char* argv[])
 {
     PaStreamParameters outputParameters;
     PaWinMmeStreamInfo wmmeStreamInfo;
     PaStream *stream;
     PaError err;
     paTestData data;
     int i;
     int deviceIndex;
 
     printf("PortAudio Test: output a sine blip on each channel. SR = %d, BufSize = %d, Chans = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER, CHANNEL_COUNT);
 
     err = Pa_Initialize();
     if( err != paNoError ) goto error;
 
 	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;
 
     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 = WMME_FRAMES_PER_BUFFER;
     wmmeStreamInfo.bufferCount = WMME_BUFFER_COUNT;
     outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo;
    
 
 	if( Pa_IsFormatSupported( 0, &outputParameters, SAMPLE_RATE ) == paFormatIsSupported  ){
 		printf( "Pa_IsFormatSupported reports device will support %d channels.\n", CHANNEL_COUNT );
 	}else{
 		printf( "Pa_IsFormatSupported reports device will not support %d channels.\n", CHANNEL_COUNT );
 	}
 
     err = Pa_OpenStream(
               &stream,
               NULL, /* no input */
               &outputParameters,
               SAMPLE_RATE,
               FRAMES_PER_BUFFER,
               paClipOff,      /* 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 for %d seconds.\n", NUM_SECONDS );
     Pa_Sleep( NUM_SECONDS * 1000 );
 
     err = Pa_StopStream( stream );
     if( err != paNoError ) goto error;
 
     err = Pa_CloseStream( 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;
 }