Mercurial > sdl-ios-xcode
comparison src/audio/SDL_audio.c @ 2664:344c8da164f4 gsoc2008_audio_resampling
Added streamer code. I haven't yet incorporated it into SDL_RunAudio() though.
| author | Aaron Wishnick <schnarf@gmail.com> |
|---|---|
| date | Tue, 12 Aug 2008 00:50:58 +0000 |
| parents | aedfcdeb69b6 |
| children | f39a056aec8b |
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| 2663:0caed045d01b | 2664:344c8da164f4 |
|---|---|
| 254 FILL_STUB(UnlockDevice); | 254 FILL_STUB(UnlockDevice); |
| 255 FILL_STUB(Deinitialize); | 255 FILL_STUB(Deinitialize); |
| 256 #undef FILL_STUB | 256 #undef FILL_STUB |
| 257 } | 257 } |
| 258 | 258 |
| 259 /* Streaming functions (for when the input and output buffer sizes are different) */ | |
| 260 /* Write [length] bytes from buf into the streamer */ | |
| 261 void SDL_StreamWrite(SDL_AudioStreamer * stream, Uint8 * buf, int length) { | |
| 262 int i; | |
| 263 | |
| 264 for(i = 0; i < length; ++i) { | |
| 265 stream->buffer[stream->write_pos] = buf[i]; | |
| 266 ++stream->write_pos; | |
| 267 } | |
| 268 } | |
| 269 | |
| 270 /* Read [length] bytes out of the streamer into buf */ | |
| 271 void SDL_StreamRead(SDL_AudioStreamer * stream, Uint8 * buf, int length) { | |
| 272 int i; | |
| 273 | |
| 274 for(i = 0; i < length; ++i) { | |
| 275 buf[i] = stream->buffer[stream->read_pos]; | |
| 276 ++stream->read_pos; | |
| 277 } | |
| 278 } | |
| 279 | |
| 280 int SDL_StreamLength(SDL_AudioStreamer * stream) { | |
| 281 return (stream->write_pos - stream->read_pos) % stream->max_len; | |
| 282 } | |
| 283 | |
| 284 /* Initialize the stream by allocating the buffer and setting the read/write heads to the beginning */ | |
| 285 int SDL_StreamInit(SDL_AudioStreamer * stream, int max_len) { | |
| 286 int i; | |
| 287 | |
| 288 /* First try to allocate the buffer */ | |
| 289 stream->buffer = (Uint8 *)malloc(max_len); | |
| 290 if(stream->buffer == NULL) { | |
| 291 return -1; | |
| 292 } | |
| 293 | |
| 294 stream->max_len = max_len; | |
| 295 stream->read_pos = 0; | |
| 296 stream->write_pos = 0; | |
| 297 | |
| 298 /* Zero out the buffer */ | |
| 299 for(i = 0; i < max_len; ++i) { | |
| 300 stream->buffer[i] = 0; | |
| 301 } | |
| 302 } | |
| 303 | |
| 304 /* Deinitialize the stream simply by freeing the buffer */ | |
| 305 void SDL_StreamDeinit(SDL_AudioStreamer * stream) { | |
| 306 if(stream->buffer != NULL) { | |
| 307 free(stream->buffer); | |
| 308 } | |
| 309 } | |
| 310 | |
| 259 | 311 |
| 260 /* The general mixing thread function */ | 312 /* The general mixing thread function */ |
| 261 int SDLCALL | 313 int SDLCALL |
| 262 SDL_RunAudio(void *devicep) | 314 SDL_RunAudio(void *devicep) |
| 263 { | 315 { |