gearmulator

Emulation of classic VA synths of the late 90s/2000s that are based on Motorola 56300 family DSPs
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paex_wmme_ac3.c (7194B)


      1 /** @file paex_wmme_ac3.c
      2 	@ingroup examples_src
      3 	@brief Use WMME-specific interface to send raw AC3 data to a S/PDIF output.
      4 	@author Ross Bencina <rossb@audiomulch.com>
      5 */
      6 /*
      7  * $Id: $
      8  * Portable Audio I/O Library
      9  * Windows MME ac3 sound output test
     10  *
     11  * Copyright (c) 2009 Ross Bencina
     12  *
     13  * Permission is hereby granted, free of charge, to any person obtaining
     14  * a copy of this software and associated documentation files
     15  * (the "Software"), to deal in the Software without restriction,
     16  * including without limitation the rights to use, copy, modify, merge,
     17  * publish, distribute, sublicense, and/or sell copies of the Software,
     18  * and to permit persons to whom the Software is furnished to do so,
     19  * subject to the following conditions:
     20  *
     21  * The above copyright notice and this permission notice shall be
     22  * included in all copies or substantial portions of the Software.
     23  *
     24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     27  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
     28  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
     29  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     30  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     31  */
     32 
     33 /*
     34  * The text above constitutes the entire PortAudio license; however, 
     35  * the PortAudio community also makes the following non-binding requests:
     36  *
     37  * Any person wishing to distribute modifications to the Software is
     38  * requested to send the modifications to the original developer so that
     39  * they can be incorporated into the canonical version. It is also 
     40  * requested that these non-binding requests be included along with the 
     41  * license above.
     42  */
     43 
     44 #include <stdio.h>
     45 #include <math.h>
     46 
     47 #include <windows.h>    /* required when using pa_win_wmme.h */
     48 #include <mmsystem.h>   /* required when using pa_win_wmme.h */
     49 
     50 #include "portaudio.h"
     51 #include "pa_win_wmme.h"
     52 
     53 #define NUM_SECONDS         (20)
     54 #define SAMPLE_RATE         (48000)
     55 #define FRAMES_PER_BUFFER   (64)
     56 
     57 #ifndef M_PI
     58 #define M_PI  (3.14159265)
     59 #endif
     60 
     61 #define TABLE_SIZE          (100)
     62 
     63 #define CHANNEL_COUNT       (2)
     64 
     65 
     66 
     67 typedef struct
     68 {
     69     short *buffer;
     70     int bufferSampleCount;
     71     int playbackIndex;
     72 }
     73 paTestData;
     74 
     75 /* This routine will be called by the PortAudio engine when audio is needed.
     76 ** It may called at interrupt level on some machines so don't do anything
     77 ** that could mess up the system like calling malloc() or free().
     78 */
     79 static int patestCallback( const void *inputBuffer, void *outputBuffer,
     80                             unsigned long framesPerBuffer,
     81                             const PaStreamCallbackTimeInfo* timeInfo,
     82                             PaStreamCallbackFlags statusFlags,
     83                             void *userData )
     84 {
     85     paTestData *data = (paTestData*)userData;
     86     short *out = (short*)outputBuffer;
     87     unsigned long i,j;
     88 
     89     (void) timeInfo; /* Prevent unused variable warnings. */
     90     (void) statusFlags;
     91     (void) inputBuffer;
     92 
     93     /* stream out contents of data->buffer looping at end */
     94     
     95     for( i=0; i<framesPerBuffer; i++ )
     96     {
     97 		for( j = 0; j < CHANNEL_COUNT; ++j ){
     98             *out++ = data->buffer[ data->playbackIndex++ ];
     99 
    100             if( data->playbackIndex >= data->bufferSampleCount )
    101                 data->playbackIndex = 0; /* loop at end of buffer */
    102 		}
    103 	}
    104     
    105     return paContinue;
    106 }
    107 
    108 /*******************************************************************/
    109 int main(int argc, char* argv[])
    110 {
    111     PaStreamParameters outputParameters;
    112     PaWinMmeStreamInfo wmmeStreamInfo;
    113     PaStream *stream;
    114     PaError err;
    115     paTestData data;
    116     int deviceIndex;
    117     FILE *fp;
    118     const char *fileName = "c:\\test_48k.ac3.spdif";
    119     data.buffer = NULL;
    120 
    121     printf("usage: patest_wmme_ac3 fileName [paDeviceIndex]\n");
    122     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");
    123     printf("PortAudio Test: output a raw spdif ac3 stream. SR = %d, BufSize = %d, Chans = %d\n", 
    124             SAMPLE_RATE, FRAMES_PER_BUFFER, CHANNEL_COUNT);
    125 
    126         
    127     if( argc >= 2 )
    128         fileName = argv[1];
    129 
    130     printf( "reading spdif ac3 raw stream file %s\n", fileName );
    131 
    132     fp = fopen( fileName, "rb" );
    133     if( !fp ){
    134         fprintf( stderr, "error opening spdif ac3 file.\n" );
    135         return -1;
    136     }
    137     /* get file size */
    138     fseek( fp, 0, SEEK_END );
    139     data.bufferSampleCount = ftell( fp ) / sizeof(short);
    140     fseek( fp, 0, SEEK_SET );
    141 
    142     /* allocate buffer, read the whole file into memory */
    143     data.buffer = (short*)malloc( data.bufferSampleCount * sizeof(short) );
    144     if( !data.buffer ){
    145         fprintf( stderr, "error allocating buffer.\n" );
    146         return -1;
    147     }
    148 
    149     fread( data.buffer, sizeof(short), data.bufferSampleCount, fp );
    150     fclose( fp );
    151 
    152     data.playbackIndex = 0;
    153 
    154     err = Pa_Initialize();
    155     if( err != paNoError ) goto error;
    156 
    157 	deviceIndex = Pa_GetHostApiInfo( Pa_HostApiTypeIdToHostApiIndex( paMME ) )->defaultOutputDevice;
    158 	if( argc >= 3 ){
    159 		sscanf( argv[1], "%d", &deviceIndex );
    160 	}
    161 
    162 	printf( "using device id %d (%s)\n", deviceIndex, Pa_GetDeviceInfo(deviceIndex)->name );
    163 
    164     
    165     outputParameters.device = deviceIndex;
    166     outputParameters.channelCount = CHANNEL_COUNT;
    167     outputParameters.sampleFormat = paInt16; /* IMPORTANT must use paInt16 for WMME AC3 */
    168     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
    169     outputParameters.hostApiSpecificStreamInfo = NULL;
    170 
    171     wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo);
    172     wmmeStreamInfo.hostApiType = paMME; 
    173     wmmeStreamInfo.version = 1;
    174     wmmeStreamInfo.flags = paWinMmeWaveFormatDolbyAc3Spdif;
    175     outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo;
    176 
    177 
    178 	if( Pa_IsFormatSupported( 0, &outputParameters, SAMPLE_RATE ) == paFormatIsSupported  ){
    179 		printf( "Pa_IsFormatSupported reports device will support %d channels.\n", CHANNEL_COUNT );
    180 	}else{
    181 		printf( "Pa_IsFormatSupported reports device will not support %d channels.\n", CHANNEL_COUNT );
    182 	}
    183 
    184     err = Pa_OpenStream(
    185               &stream,
    186               NULL, /* no input */
    187               &outputParameters,
    188               SAMPLE_RATE,
    189               FRAMES_PER_BUFFER,
    190               0,
    191               patestCallback,
    192               &data );
    193     if( err != paNoError ) goto error;
    194 
    195     err = Pa_StartStream( stream );
    196     if( err != paNoError ) goto error;
    197 
    198     printf("Play for %d seconds.\n", NUM_SECONDS );
    199     Pa_Sleep( NUM_SECONDS * 1000 );
    200 
    201     err = Pa_StopStream( stream );
    202     if( err != paNoError ) goto error;
    203 
    204     err = Pa_CloseStream( stream );
    205     if( err != paNoError ) goto error;
    206 
    207     Pa_Terminate();
    208     free( data.buffer );
    209     printf("Test finished.\n");
    210     
    211     return err;
    212 error:
    213     Pa_Terminate();
    214     free( data.buffer );
    215 
    216     fprintf( stderr, "An error occured while using the portaudio stream\n" );
    217     fprintf( stderr, "Error number: %d\n", err );
    218     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
    219     return err;
    220 }
    221