PortAudio 2.0
paex_wmme_ac3.c
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00001 
00006 /*
00007  * $Id: $
00008  * Portable Audio I/O Library
00009  * Windows MME ac3 sound output test
00010  *
00011  * Copyright (c) 2009 Ross Bencina
00012  *
00013  * Permission is hereby granted, free of charge, to any person obtaining
00014  * a copy of this software and associated documentation files
00015  * (the "Software"), to deal in the Software without restriction,
00016  * including without limitation the rights to use, copy, modify, merge,
00017  * publish, distribute, sublicense, and/or sell copies of the Software,
00018  * and to permit persons to whom the Software is furnished to do so,
00019  * subject to the following conditions:
00020  *
00021  * The above copyright notice and this permission notice shall be
00022  * included in all copies or substantial portions of the Software.
00023  *
00024  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
00027  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
00028  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
00029  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  */
00032 
00033 /*
00034  * The text above constitutes the entire PortAudio license; however, 
00035  * the PortAudio community also makes the following non-binding requests:
00036  *
00037  * Any person wishing to distribute modifications to the Software is
00038  * requested to send the modifications to the original developer so that
00039  * they can be incorporated into the canonical version. It is also 
00040  * requested that these non-binding requests be included along with the 
00041  * license above.
00042  */
00043 
00044 #include <stdio.h>
00045 #include <math.h>
00046 
00047 #include <windows.h>    /* required when using pa_win_wmme.h */
00048 #include <mmsystem.h>   /* required when using pa_win_wmme.h */
00049 
00050 #include "portaudio.h"
00051 #include "pa_win_wmme.h"
00052 
00053 #define NUM_SECONDS         (20)
00054 #define SAMPLE_RATE         (48000)
00055 #define FRAMES_PER_BUFFER   (64)
00056 
00057 #ifndef M_PI
00058 #define M_PI  (3.14159265)
00059 #endif
00060 
00061 #define TABLE_SIZE          (100)
00062 
00063 #define CHANNEL_COUNT       (2)
00064 
00065 
00066 
00067 typedef struct
00068 {
00069     short *buffer;
00070     int bufferSampleCount;
00071     int playbackIndex;
00072 }
00073 paTestData;
00074 
00075 /* This routine will be called by the PortAudio engine when audio is needed.
00076 ** It may called at interrupt level on some machines so don't do anything
00077 ** that could mess up the system like calling malloc() or free().
00078 */
00079 static int patestCallback( const void *inputBuffer, void *outputBuffer,
00080                             unsigned long framesPerBuffer,
00081                             const PaStreamCallbackTimeInfo* timeInfo,
00082                             PaStreamCallbackFlags statusFlags,
00083                             void *userData )
00084 {
00085     paTestData *data = (paTestData*)userData;
00086     short *out = (short*)outputBuffer;
00087     unsigned long i,j;
00088 
00089     (void) timeInfo; /* Prevent unused variable warnings. */
00090     (void) statusFlags;
00091     (void) inputBuffer;
00092 
00093     /* stream out contents of data->buffer looping at end */
00094     
00095     for( i=0; i<framesPerBuffer; i++ )
00096     {
00097                 for( j = 0; j < CHANNEL_COUNT; ++j ){
00098             *out++ = data->buffer[ data->playbackIndex++ ];
00099 
00100             if( data->playbackIndex >= data->bufferSampleCount )
00101                 data->playbackIndex = 0; /* loop at end of buffer */
00102                 }
00103         }
00104     
00105     return paContinue;
00106 }
00107 
00108 /*******************************************************************/
00109 int main(int argc, char* argv[])
00110 {
00111     PaStreamParameters outputParameters;
00112     PaWinMmeStreamInfo wmmeStreamInfo;
00113     PaStream *stream;
00114     PaError err;
00115     paTestData data;
00116     int i;
00117     int deviceIndex;
00118     FILE *fp;
00119     const char *fileName = "c:\\test_48k.ac3.spdif";
00120     data.buffer = NULL;
00121 
00122     printf("usage: patest_wmme_ac3 fileName [paDeviceIndex]\n");
00123     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");
00124     printf("PortAudio Test: output a raw spdif ac3 stream. SR = %d, BufSize = %d, Chans = %d\n", 
00125             SAMPLE_RATE, FRAMES_PER_BUFFER, CHANNEL_COUNT);
00126 
00127         
00128     if( argc >= 2 )
00129         fileName = argv[1];
00130 
00131     printf( "reading spdif ac3 raw stream file %s\n", fileName );
00132 
00133     fp = fopen( fileName, "rb" );
00134     if( !fp ){
00135         fprintf( stderr, "error opening spdif ac3 file.\n" );
00136         return -1;
00137     }
00138     /* get file size */
00139     fseek( fp, 0, SEEK_END );
00140     data.bufferSampleCount = ftell( fp ) / sizeof(short);
00141     fseek( fp, 0, SEEK_SET );
00142 
00143     /* allocate buffer, read the whole file into memory */
00144     data.buffer = (short*)malloc( data.bufferSampleCount * sizeof(short) );
00145     if( !data.buffer ){
00146         fprintf( stderr, "error allocating buffer.\n" );
00147         return -1;
00148     }
00149 
00150     fread( data.buffer, sizeof(short), data.bufferSampleCount, fp );
00151     fclose( fp );
00152 
00153     data.playbackIndex = 0;
00154 
00155     err = Pa_Initialize();
00156     if( err != paNoError ) goto error;
00157 
00158         deviceIndex = Pa_GetHostApiInfo( Pa_HostApiTypeIdToHostApiIndex( paMME ) )->defaultOutputDevice;
00159         if( argc >= 3 ){
00160                 sscanf( argv[1], "%d", &deviceIndex );
00161         }
00162 
00163         printf( "using device id %d (%s)\n", deviceIndex, Pa_GetDeviceInfo(deviceIndex)->name );
00164 
00165     
00166     outputParameters.device = deviceIndex;
00167     outputParameters.channelCount = CHANNEL_COUNT;
00168     outputParameters.sampleFormat = paInt16; /* IMPORTANT must use paInt16 for WMME AC3 */
00169     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
00170     outputParameters.hostApiSpecificStreamInfo = NULL;
00171 
00172     wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo);
00173     wmmeStreamInfo.hostApiType = paMME; 
00174     wmmeStreamInfo.version = 1;
00175     wmmeStreamInfo.flags = paWinMmeWaveFormatDolbyAc3Spdif;
00176     outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo;
00177 
00178 
00179         if( Pa_IsFormatSupported( 0, &outputParameters, SAMPLE_RATE ) == paFormatIsSupported  ){
00180                 printf( "Pa_IsFormatSupported reports device will support %d channels.\n", CHANNEL_COUNT );
00181         }else{
00182                 printf( "Pa_IsFormatSupported reports device will not support %d channels.\n", CHANNEL_COUNT );
00183         }
00184 
00185     err = Pa_OpenStream(
00186               &stream,
00187               NULL, /* no input */
00188               &outputParameters,
00189               SAMPLE_RATE,
00190               FRAMES_PER_BUFFER,
00191               0,
00192               patestCallback,
00193               &data );
00194     if( err != paNoError ) goto error;
00195 
00196     err = Pa_StartStream( stream );
00197     if( err != paNoError ) goto error;
00198 
00199     printf("Play for %d seconds.\n", NUM_SECONDS );
00200     Pa_Sleep( NUM_SECONDS * 1000 );
00201 
00202     err = Pa_StopStream( stream );
00203     if( err != paNoError ) goto error;
00204 
00205     err = Pa_CloseStream( stream );
00206     if( err != paNoError ) goto error;
00207 
00208     Pa_Terminate();
00209     free( data.buffer );
00210     printf("Test finished.\n");
00211     
00212     return err;
00213 error:
00214     Pa_Terminate();
00215     free( data.buffer );
00216 
00217     fprintf( stderr, "An error occured while using the portaudio stream\n" );
00218     fprintf( stderr, "Error number: %d\n", err );
00219     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
00220     return err;
00221 }
00222