cannam@124: /** @file paex_wmme_ac3.c
cannam@124: 	@ingroup examples_src
cannam@124: 	@brief Use WMME-specific interface to send raw AC3 data to a S/PDIF output.
cannam@124: 	@author Ross Bencina <rossb@audiomulch.com>
cannam@124: */
cannam@124: /*
cannam@124:  * $Id: $
cannam@124:  * Portable Audio I/O Library
cannam@124:  * Windows MME ac3 sound output test
cannam@124:  *
cannam@124:  * Copyright (c) 2009 Ross Bencina
cannam@124:  *
cannam@124:  * Permission is hereby granted, free of charge, to any person obtaining
cannam@124:  * a copy of this software and associated documentation files
cannam@124:  * (the "Software"), to deal in the Software without restriction,
cannam@124:  * including without limitation the rights to use, copy, modify, merge,
cannam@124:  * publish, distribute, sublicense, and/or sell copies of the Software,
cannam@124:  * and to permit persons to whom the Software is furnished to do so,
cannam@124:  * subject to the following conditions:
cannam@124:  *
cannam@124:  * The above copyright notice and this permission notice shall be
cannam@124:  * included in all copies or substantial portions of the Software.
cannam@124:  *
cannam@124:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@124:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@124:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
cannam@124:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
cannam@124:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@124:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@124:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@124:  */
cannam@124: 
cannam@124: /*
cannam@124:  * The text above constitutes the entire PortAudio license; however, 
cannam@124:  * the PortAudio community also makes the following non-binding requests:
cannam@124:  *
cannam@124:  * Any person wishing to distribute modifications to the Software is
cannam@124:  * requested to send the modifications to the original developer so that
cannam@124:  * they can be incorporated into the canonical version. It is also 
cannam@124:  * requested that these non-binding requests be included along with the 
cannam@124:  * license above.
cannam@124:  */
cannam@124: 
cannam@124: #include <stdio.h>
cannam@124: #include <math.h>
cannam@124: 
cannam@124: #include <windows.h>    /* required when using pa_win_wmme.h */
cannam@124: #include <mmsystem.h>   /* required when using pa_win_wmme.h */
cannam@124: 
cannam@124: #include "portaudio.h"
cannam@124: #include "pa_win_wmme.h"
cannam@124: 
cannam@124: #define NUM_SECONDS         (20)
cannam@124: #define SAMPLE_RATE         (48000)
cannam@124: #define FRAMES_PER_BUFFER   (64)
cannam@124: 
cannam@124: #ifndef M_PI
cannam@124: #define M_PI  (3.14159265)
cannam@124: #endif
cannam@124: 
cannam@124: #define TABLE_SIZE          (100)
cannam@124: 
cannam@124: #define CHANNEL_COUNT       (2)
cannam@124: 
cannam@124: 
cannam@124: 
cannam@124: typedef struct
cannam@124: {
cannam@124:     short *buffer;
cannam@124:     int bufferSampleCount;
cannam@124:     int playbackIndex;
cannam@124: }
cannam@124: paTestData;
cannam@124: 
cannam@124: /* This routine will be called by the PortAudio engine when audio is needed.
cannam@124: ** It may called at interrupt level on some machines so don't do anything
cannam@124: ** that could mess up the system like calling malloc() or free().
cannam@124: */
cannam@124: static int patestCallback( const void *inputBuffer, void *outputBuffer,
cannam@124:                             unsigned long framesPerBuffer,
cannam@124:                             const PaStreamCallbackTimeInfo* timeInfo,
cannam@124:                             PaStreamCallbackFlags statusFlags,
cannam@124:                             void *userData )
cannam@124: {
cannam@124:     paTestData *data = (paTestData*)userData;
cannam@124:     short *out = (short*)outputBuffer;
cannam@124:     unsigned long i,j;
cannam@124: 
cannam@124:     (void) timeInfo; /* Prevent unused variable warnings. */
cannam@124:     (void) statusFlags;
cannam@124:     (void) inputBuffer;
cannam@124: 
cannam@124:     /* stream out contents of data->buffer looping at end */
cannam@124:     
cannam@124:     for( i=0; i<framesPerBuffer; i++ )
cannam@124:     {
cannam@124: 		for( j = 0; j < CHANNEL_COUNT; ++j ){
cannam@124:             *out++ = data->buffer[ data->playbackIndex++ ];
cannam@124: 
cannam@124:             if( data->playbackIndex >= data->bufferSampleCount )
cannam@124:                 data->playbackIndex = 0; /* loop at end of buffer */
cannam@124: 		}
cannam@124: 	}
cannam@124:     
cannam@124:     return paContinue;
cannam@124: }
cannam@124: 
cannam@124: /*******************************************************************/
cannam@124: int main(int argc, char* argv[])
cannam@124: {
cannam@124:     PaStreamParameters outputParameters;
cannam@124:     PaWinMmeStreamInfo wmmeStreamInfo;
cannam@124:     PaStream *stream;
cannam@124:     PaError err;
cannam@124:     paTestData data;
cannam@124:     int i;
cannam@124:     int deviceIndex;
cannam@124:     FILE *fp;
cannam@124:     const char *fileName = "c:\\test_48k.ac3.spdif";
cannam@124:     data.buffer = NULL;
cannam@124: 
cannam@124:     printf("usage: patest_wmme_ac3 fileName [paDeviceIndex]\n");
cannam@124:     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");
cannam@124:     printf("PortAudio Test: output a raw spdif ac3 stream. SR = %d, BufSize = %d, Chans = %d\n", 
cannam@124:             SAMPLE_RATE, FRAMES_PER_BUFFER, CHANNEL_COUNT);
cannam@124: 
cannam@124:         
cannam@124:     if( argc >= 2 )
cannam@124:         fileName = argv[1];
cannam@124: 
cannam@124:     printf( "reading spdif ac3 raw stream file %s\n", fileName );
cannam@124: 
cannam@124:     fp = fopen( fileName, "rb" );
cannam@124:     if( !fp ){
cannam@124:         fprintf( stderr, "error opening spdif ac3 file.\n" );
cannam@124:         return -1;
cannam@124:     }
cannam@124:     /* get file size */
cannam@124:     fseek( fp, 0, SEEK_END );
cannam@124:     data.bufferSampleCount = ftell( fp ) / sizeof(short);
cannam@124:     fseek( fp, 0, SEEK_SET );
cannam@124: 
cannam@124:     /* allocate buffer, read the whole file into memory */
cannam@124:     data.buffer = (short*)malloc( data.bufferSampleCount * sizeof(short) );
cannam@124:     if( !data.buffer ){
cannam@124:         fprintf( stderr, "error allocating buffer.\n" );
cannam@124:         return -1;
cannam@124:     }
cannam@124: 
cannam@124:     fread( data.buffer, sizeof(short), data.bufferSampleCount, fp );
cannam@124:     fclose( fp );
cannam@124: 
cannam@124:     data.playbackIndex = 0;
cannam@124: 
cannam@124:     err = Pa_Initialize();
cannam@124:     if( err != paNoError ) goto error;
cannam@124: 
cannam@124: 	deviceIndex = Pa_GetHostApiInfo( Pa_HostApiTypeIdToHostApiIndex( paMME ) )->defaultOutputDevice;
cannam@124: 	if( argc >= 3 ){
cannam@124: 		sscanf( argv[1], "%d", &deviceIndex );
cannam@124: 	}
cannam@124: 
cannam@124: 	printf( "using device id %d (%s)\n", deviceIndex, Pa_GetDeviceInfo(deviceIndex)->name );
cannam@124: 
cannam@124:     
cannam@124:     outputParameters.device = deviceIndex;
cannam@124:     outputParameters.channelCount = CHANNEL_COUNT;
cannam@124:     outputParameters.sampleFormat = paInt16; /* IMPORTANT must use paInt16 for WMME AC3 */
cannam@124:     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
cannam@124:     outputParameters.hostApiSpecificStreamInfo = NULL;
cannam@124: 
cannam@124:     wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo);
cannam@124:     wmmeStreamInfo.hostApiType = paMME; 
cannam@124:     wmmeStreamInfo.version = 1;
cannam@124:     wmmeStreamInfo.flags = paWinMmeWaveFormatDolbyAc3Spdif;
cannam@124:     outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo;
cannam@124: 
cannam@124: 
cannam@124: 	if( Pa_IsFormatSupported( 0, &outputParameters, SAMPLE_RATE ) == paFormatIsSupported  ){
cannam@124: 		printf( "Pa_IsFormatSupported reports device will support %d channels.\n", CHANNEL_COUNT );
cannam@124: 	}else{
cannam@124: 		printf( "Pa_IsFormatSupported reports device will not support %d channels.\n", CHANNEL_COUNT );
cannam@124: 	}
cannam@124: 
cannam@124:     err = Pa_OpenStream(
cannam@124:               &stream,
cannam@124:               NULL, /* no input */
cannam@124:               &outputParameters,
cannam@124:               SAMPLE_RATE,
cannam@124:               FRAMES_PER_BUFFER,
cannam@124:               0,
cannam@124:               patestCallback,
cannam@124:               &data );
cannam@124:     if( err != paNoError ) goto error;
cannam@124: 
cannam@124:     err = Pa_StartStream( stream );
cannam@124:     if( err != paNoError ) goto error;
cannam@124: 
cannam@124:     printf("Play for %d seconds.\n", NUM_SECONDS );
cannam@124:     Pa_Sleep( NUM_SECONDS * 1000 );
cannam@124: 
cannam@124:     err = Pa_StopStream( stream );
cannam@124:     if( err != paNoError ) goto error;
cannam@124: 
cannam@124:     err = Pa_CloseStream( stream );
cannam@124:     if( err != paNoError ) goto error;
cannam@124: 
cannam@124:     Pa_Terminate();
cannam@124:     free( data.buffer );
cannam@124:     printf("Test finished.\n");
cannam@124:     
cannam@124:     return err;
cannam@124: error:
cannam@124:     Pa_Terminate();
cannam@124:     free( data.buffer );
cannam@124: 
cannam@124:     fprintf( stderr, "An error occured while using the portaudio stream\n" );
cannam@124:     fprintf( stderr, "Error number: %d\n", err );
cannam@124:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
cannam@124:     return err;
cannam@124: }
cannam@124: