Chris@4: /** @file paex_wmme_ac3.c
Chris@4: 	@ingroup examples_src
Chris@4: 	@brief Use WMME-specific interface to send raw AC3 data to a S/PDIF output.
Chris@4: 	@author Ross Bencina <rossb@audiomulch.com>
Chris@4: */
Chris@4: /*
Chris@4:  * $Id: $
Chris@4:  * Portable Audio I/O Library
Chris@4:  * Windows MME ac3 sound output test
Chris@4:  *
Chris@4:  * Copyright (c) 2009 Ross Bencina
Chris@4:  *
Chris@4:  * Permission is hereby granted, free of charge, to any person obtaining
Chris@4:  * a copy of this software and associated documentation files
Chris@4:  * (the "Software"), to deal in the Software without restriction,
Chris@4:  * including without limitation the rights to use, copy, modify, merge,
Chris@4:  * publish, distribute, sublicense, and/or sell copies of the Software,
Chris@4:  * and to permit persons to whom the Software is furnished to do so,
Chris@4:  * subject to the following conditions:
Chris@4:  *
Chris@4:  * The above copyright notice and this permission notice shall be
Chris@4:  * included in all copies or substantial portions of the Software.
Chris@4:  *
Chris@4:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
Chris@4:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Chris@4:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
Chris@4:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
Chris@4:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
Chris@4:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
Chris@4:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Chris@4:  */
Chris@4: 
Chris@4: /*
Chris@4:  * The text above constitutes the entire PortAudio license; however, 
Chris@4:  * the PortAudio community also makes the following non-binding requests:
Chris@4:  *
Chris@4:  * Any person wishing to distribute modifications to the Software is
Chris@4:  * requested to send the modifications to the original developer so that
Chris@4:  * they can be incorporated into the canonical version. It is also 
Chris@4:  * requested that these non-binding requests be included along with the 
Chris@4:  * license above.
Chris@4:  */
Chris@4: 
Chris@4: #include <stdio.h>
Chris@4: #include <math.h>
Chris@4: 
Chris@4: #include <windows.h>    /* required when using pa_win_wmme.h */
Chris@4: #include <mmsystem.h>   /* required when using pa_win_wmme.h */
Chris@4: 
Chris@4: #include "portaudio.h"
Chris@4: #include "pa_win_wmme.h"
Chris@4: 
Chris@4: #define NUM_SECONDS         (20)
Chris@4: #define SAMPLE_RATE         (48000)
Chris@4: #define FRAMES_PER_BUFFER   (64)
Chris@4: 
Chris@4: #ifndef M_PI
Chris@4: #define M_PI  (3.14159265)
Chris@4: #endif
Chris@4: 
Chris@4: #define TABLE_SIZE          (100)
Chris@4: 
Chris@4: #define CHANNEL_COUNT       (2)
Chris@4: 
Chris@4: 
Chris@4: 
Chris@4: typedef struct
Chris@4: {
Chris@4:     short *buffer;
Chris@4:     int bufferSampleCount;
Chris@4:     int playbackIndex;
Chris@4: }
Chris@4: paTestData;
Chris@4: 
Chris@4: /* This routine will be called by the PortAudio engine when audio is needed.
Chris@4: ** It may called at interrupt level on some machines so don't do anything
Chris@4: ** that could mess up the system like calling malloc() or free().
Chris@4: */
Chris@4: static int patestCallback( const void *inputBuffer, void *outputBuffer,
Chris@4:                             unsigned long framesPerBuffer,
Chris@4:                             const PaStreamCallbackTimeInfo* timeInfo,
Chris@4:                             PaStreamCallbackFlags statusFlags,
Chris@4:                             void *userData )
Chris@4: {
Chris@4:     paTestData *data = (paTestData*)userData;
Chris@4:     short *out = (short*)outputBuffer;
Chris@4:     unsigned long i,j;
Chris@4: 
Chris@4:     (void) timeInfo; /* Prevent unused variable warnings. */
Chris@4:     (void) statusFlags;
Chris@4:     (void) inputBuffer;
Chris@4: 
Chris@4:     /* stream out contents of data->buffer looping at end */
Chris@4:     
Chris@4:     for( i=0; i<framesPerBuffer; i++ )
Chris@4:     {
Chris@4: 		for( j = 0; j < CHANNEL_COUNT; ++j ){
Chris@4:             *out++ = data->buffer[ data->playbackIndex++ ];
Chris@4: 
Chris@4:             if( data->playbackIndex >= data->bufferSampleCount )
Chris@4:                 data->playbackIndex = 0; /* loop at end of buffer */
Chris@4: 		}
Chris@4: 	}
Chris@4:     
Chris@4:     return paContinue;
Chris@4: }
Chris@4: 
Chris@4: /*******************************************************************/
Chris@4: int main(int argc, char* argv[])
Chris@4: {
Chris@4:     PaStreamParameters outputParameters;
Chris@4:     PaWinMmeStreamInfo wmmeStreamInfo;
Chris@4:     PaStream *stream;
Chris@4:     PaError err;
Chris@4:     paTestData data;
Chris@4:     int i;
Chris@4:     int deviceIndex;
Chris@4:     FILE *fp;
Chris@4:     const char *fileName = "c:\\test_48k.ac3.spdif";
Chris@4:     data.buffer = NULL;
Chris@4: 
Chris@4:     printf("usage: patest_wmme_ac3 fileName [paDeviceIndex]\n");
Chris@4:     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");
Chris@4:     printf("PortAudio Test: output a raw spdif ac3 stream. SR = %d, BufSize = %d, Chans = %d\n", 
Chris@4:             SAMPLE_RATE, FRAMES_PER_BUFFER, CHANNEL_COUNT);
Chris@4: 
Chris@4:         
Chris@4:     if( argc >= 2 )
Chris@4:         fileName = argv[1];
Chris@4: 
Chris@4:     printf( "reading spdif ac3 raw stream file %s\n", fileName );
Chris@4: 
Chris@4:     fp = fopen( fileName, "rb" );
Chris@4:     if( !fp ){
Chris@4:         fprintf( stderr, "error opening spdif ac3 file.\n" );
Chris@4:         return -1;
Chris@4:     }
Chris@4:     /* get file size */
Chris@4:     fseek( fp, 0, SEEK_END );
Chris@4:     data.bufferSampleCount = ftell( fp ) / sizeof(short);
Chris@4:     fseek( fp, 0, SEEK_SET );
Chris@4: 
Chris@4:     /* allocate buffer, read the whole file into memory */
Chris@4:     data.buffer = (short*)malloc( data.bufferSampleCount * sizeof(short) );
Chris@4:     if( !data.buffer ){
Chris@4:         fprintf( stderr, "error allocating buffer.\n" );
Chris@4:         return -1;
Chris@4:     }
Chris@4: 
Chris@4:     fread( data.buffer, sizeof(short), data.bufferSampleCount, fp );
Chris@4:     fclose( fp );
Chris@4: 
Chris@4:     data.playbackIndex = 0;
Chris@4: 
Chris@4:     err = Pa_Initialize();
Chris@4:     if( err != paNoError ) goto error;
Chris@4: 
Chris@4: 	deviceIndex = Pa_GetHostApiInfo( Pa_HostApiTypeIdToHostApiIndex( paMME ) )->defaultOutputDevice;
Chris@4: 	if( argc >= 3 ){
Chris@4: 		sscanf( argv[1], "%d", &deviceIndex );
Chris@4: 	}
Chris@4: 
Chris@4: 	printf( "using device id %d (%s)\n", deviceIndex, Pa_GetDeviceInfo(deviceIndex)->name );
Chris@4: 
Chris@4:     
Chris@4:     outputParameters.device = deviceIndex;
Chris@4:     outputParameters.channelCount = CHANNEL_COUNT;
Chris@4:     outputParameters.sampleFormat = paInt16; /* IMPORTANT must use paInt16 for WMME AC3 */
Chris@4:     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
Chris@4:     outputParameters.hostApiSpecificStreamInfo = NULL;
Chris@4: 
Chris@4:     wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo);
Chris@4:     wmmeStreamInfo.hostApiType = paMME; 
Chris@4:     wmmeStreamInfo.version = 1;
Chris@4:     wmmeStreamInfo.flags = paWinMmeWaveFormatDolbyAc3Spdif;
Chris@4:     outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo;
Chris@4: 
Chris@4: 
Chris@4: 	if( Pa_IsFormatSupported( 0, &outputParameters, SAMPLE_RATE ) == paFormatIsSupported  ){
Chris@4: 		printf( "Pa_IsFormatSupported reports device will support %d channels.\n", CHANNEL_COUNT );
Chris@4: 	}else{
Chris@4: 		printf( "Pa_IsFormatSupported reports device will not support %d channels.\n", CHANNEL_COUNT );
Chris@4: 	}
Chris@4: 
Chris@4:     err = Pa_OpenStream(
Chris@4:               &stream,
Chris@4:               NULL, /* no input */
Chris@4:               &outputParameters,
Chris@4:               SAMPLE_RATE,
Chris@4:               FRAMES_PER_BUFFER,
Chris@4:               0,
Chris@4:               patestCallback,
Chris@4:               &data );
Chris@4:     if( err != paNoError ) goto error;
Chris@4: 
Chris@4:     err = Pa_StartStream( stream );
Chris@4:     if( err != paNoError ) goto error;
Chris@4: 
Chris@4:     printf("Play for %d seconds.\n", NUM_SECONDS );
Chris@4:     Pa_Sleep( NUM_SECONDS * 1000 );
Chris@4: 
Chris@4:     err = Pa_StopStream( stream );
Chris@4:     if( err != paNoError ) goto error;
Chris@4: 
Chris@4:     err = Pa_CloseStream( stream );
Chris@4:     if( err != paNoError ) goto error;
Chris@4: 
Chris@4:     Pa_Terminate();
Chris@4:     free( data.buffer );
Chris@4:     printf("Test finished.\n");
Chris@4:     
Chris@4:     return err;
Chris@4: error:
Chris@4:     Pa_Terminate();
Chris@4:     free( data.buffer );
Chris@4: 
Chris@4:     fprintf( stderr, "An error occured while using the portaudio stream\n" );
Chris@4:     fprintf( stderr, "Error number: %d\n", err );
Chris@4:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
Chris@4:     return err;
Chris@4: }
Chris@4: