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/** @file paex_wmme_ac3.c
@ingroup examples_src
@brief Use WMME-specific interface to send raw AC3 data to a S/PDIF output.
@author Ross Bencina <rossb@audiomulch.com>
*/
/*
* $Id: $
* Portable Audio I/O Library
* Windows MME ac3 sound output test
*
* Copyright (c) 2009 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 (20)
#define SAMPLE_RATE (48000)
#define FRAMES_PER_BUFFER (64)
#ifndef M_PI
#define M_PI (3.14159265)
#endif
#define TABLE_SIZE (100)
#define CHANNEL_COUNT (2)
typedef struct
{
short *buffer;
int bufferSampleCount;
int playbackIndex;
}
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;
short *out = (short*)outputBuffer;
unsigned long i,j;
(void) timeInfo; /* Prevent unused variable warnings. */
(void) statusFlags;
(void) inputBuffer;
/* stream out contents of data->buffer looping at end */
for( i=0; i<framesPerBuffer; i++ )
{
for( j = 0; j < CHANNEL_COUNT; ++j ){
*out++ = data->buffer[ data->playbackIndex++ ];
if( data->playbackIndex >= data->bufferSampleCount )
data->playbackIndex = 0; /* loop at end of buffer */
}
}
return paContinue;
}
/*******************************************************************/
int main(int argc, char* argv[])
{
PaStreamParameters outputParameters;
PaWinMmeStreamInfo wmmeStreamInfo;
PaStream *stream;
PaError err;
paTestData data;
int deviceIndex;
FILE *fp;
const char *fileName = "c:\\test_48k.ac3.spdif";
data.buffer = NULL;
printf("usage: patest_wmme_ac3 fileName [paDeviceIndex]\n");
printf("**IMPORTANT*** The provided file must include the spdif preamble at the start of every AC-3 frame. Using a normal ac3 file won't work.\n");
printf("PortAudio Test: output a raw spdif ac3 stream. SR = %d, BufSize = %d, Chans = %d\n",
SAMPLE_RATE, FRAMES_PER_BUFFER, CHANNEL_COUNT);
if( argc >= 2 )
fileName = argv[1];
printf( "reading spdif ac3 raw stream file %s\n", fileName );
fp = fopen( fileName, "rb" );
if( !fp ){
fprintf( stderr, "error opening spdif ac3 file.\n" );
return -1;
}
/* get file size */
fseek( fp, 0, SEEK_END );
data.bufferSampleCount = ftell( fp ) / sizeof(short);
fseek( fp, 0, SEEK_SET );
/* allocate buffer, read the whole file into memory */
data.buffer = (short*)malloc( data.bufferSampleCount * sizeof(short) );
if( !data.buffer ){
fprintf( stderr, "error allocating buffer.\n" );
return -1;
}
fread( data.buffer, sizeof(short), data.bufferSampleCount, fp );
fclose( fp );
data.playbackIndex = 0;
err = Pa_Initialize();
if( err != paNoError ) goto error;
deviceIndex = Pa_GetHostApiInfo( Pa_HostApiTypeIdToHostApiIndex( paMME ) )->defaultOutputDevice;
if( argc >= 3 ){
sscanf( argv[1], "%d", &deviceIndex );
}
printf( "using device id %d (%s)\n", deviceIndex, Pa_GetDeviceInfo(deviceIndex)->name );
outputParameters.device = deviceIndex;
outputParameters.channelCount = CHANNEL_COUNT;
outputParameters.sampleFormat = paInt16; /* IMPORTANT must use paInt16 for WMME AC3 */
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
outputParameters.hostApiSpecificStreamInfo = NULL;
wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo);
wmmeStreamInfo.hostApiType = paMME;
wmmeStreamInfo.version = 1;
wmmeStreamInfo.flags = paWinMmeWaveFormatDolbyAc3Spdif;
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,
0,
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();
free( data.buffer );
printf("Test finished.\n");
return err;
error:
Pa_Terminate();
free( data.buffer );
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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