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