| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Library General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Library General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Library General Public |
| 16 | License along with this library; if not, write to the Free |
| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | |
| 22 | This file based on Apple sample code. We haven't changed the file name, |
| 23 | so if you want to see the original search for it on apple.com/developer |
| 24 | */ |
| 25 | #include "SDL_config.h" |
| 26 | |
| 27 | /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 28 | AudioFileManager.cpp |
| 29 | */ |
| 30 | #include "AudioFilePlayer.h" |
| 31 | #include <mach/mach.h> /* used for setting policy of thread */ |
| 32 | #include "SDLOSXCAGuard.h" |
| 33 | #include <pthread.h> |
| 34 | |
| 35 | /*#include <list>*/ |
| 36 | |
| 37 | /*typedef void *FileData;*/ |
| 38 | typedef struct S_FileData |
| 39 | { |
| 40 | AudioFileManager *obj; |
| 41 | struct S_FileData *next; |
| 42 | } FileData; |
| 43 | |
| 44 | |
| 45 | typedef struct S_FileReaderThread { |
| 46 | /*public:*/ |
| 47 | SDLOSXCAGuard* (*GetGuard)(struct S_FileReaderThread *frt); |
| 48 | void (*AddReader)(struct S_FileReaderThread *frt); |
| 49 | void (*RemoveReader)(struct S_FileReaderThread *frt, AudioFileManager* inItem); |
| 50 | int (*TryNextRead)(struct S_FileReaderThread *frt, AudioFileManager* inItem); |
| 51 | |
| 52 | int mThreadShouldDie; |
| 53 | |
| 54 | /*private:*/ |
| 55 | /*typedef std::list<AudioFileManager*> FileData;*/ |
| 56 | |
| 57 | SDLOSXCAGuard *mGuard; |
| 58 | UInt32 mThreadPriority; |
| 59 | |
| 60 | int mNumReaders; |
| 61 | FileData *mFileData; |
| 62 | |
| 63 | |
| 64 | void (*ReadNextChunk)(struct S_FileReaderThread *frt); |
| 65 | int (*StartFixedPriorityThread)(struct S_FileReaderThread *frt); |
| 66 | /*static*/ |
| 67 | UInt32 (*GetThreadBasePriority)(pthread_t inThread); |
| 68 | /*static*/ |
| 69 | void* (*DiskReaderEntry)(void *inRefCon); |
| 70 | } FileReaderThread; |
| 71 | |
| 72 | |
| 73 | static SDLOSXCAGuard* FileReaderThread_GetGuard(FileReaderThread *frt) |
| 74 | { |
| 75 | return frt->mGuard; |
| 76 | } |
| 77 | |
| 78 | /* returns 1 if succeeded */ |
| 79 | static int FileReaderThread_TryNextRead (FileReaderThread *frt, AudioFileManager* inItem) |
| 80 | { |
| 81 | int didLock = 0; |
| 82 | int succeeded = 0; |
| 83 | if (frt->mGuard->Try(frt->mGuard, &didLock)) |
| 84 | { |
| 85 | /*frt->mFileData.push_back (inItem);*/ |
| 86 | /* !!! FIXME: this could be faster with a "tail" member. --ryan. */ |
| 87 | FileData *i = frt->mFileData; |
| 88 | FileData *prev = NULL; |
| 89 | |
| 90 | FileData *newfd = (FileData *) SDL_malloc(sizeof (FileData)); |
| 91 | newfd->obj = inItem; |
| 92 | newfd->next = NULL; |
| 93 | |
| 94 | while (i != NULL) { prev = i; i = i->next; } |
| 95 | if (prev == NULL) |
| 96 | frt->mFileData = newfd; |
| 97 | else |
| 98 | prev->next = newfd; |
| 99 | |
| 100 | frt->mGuard->Notify(frt->mGuard); |
| 101 | succeeded = 1; |
| 102 | |
| 103 | if (didLock) |
| 104 | frt->mGuard->Unlock(frt->mGuard); |
| 105 | } |
| 106 | |
| 107 | return succeeded; |
| 108 | } |
| 109 | |
| 110 | static void FileReaderThread_AddReader(FileReaderThread *frt) |
| 111 | { |
| 112 | if (frt->mNumReaders == 0) |
| 113 | { |
| 114 | frt->mThreadShouldDie = 0; |
| 115 | frt->StartFixedPriorityThread (frt); |
| 116 | } |
| 117 | frt->mNumReaders++; |
| 118 | } |
| 119 | |
| 120 | static void FileReaderThread_RemoveReader (FileReaderThread *frt, AudioFileManager* inItem) |
| 121 | { |
| 122 | if (frt->mNumReaders > 0) |
| 123 | { |
| 124 | int bNeedsRelease = frt->mGuard->Lock(frt->mGuard); |
| 125 | |
| 126 | /*frt->mFileData.remove (inItem);*/ |
| 127 | FileData *i = frt->mFileData; |
| 128 | FileData *prev = NULL; |
| 129 | while (i != NULL) |
| 130 | { |
| 131 | FileData *next = i->next; |
| 132 | if (i->obj != inItem) |
| 133 | prev = i; |
| 134 | else |
| 135 | { |
| 136 | if (prev == NULL) |
| 137 | frt->mFileData = next; |
| 138 | else |
| 139 | prev->next = next; |
| 140 | SDL_free(i); |
| 141 | } |
| 142 | i = next; |
| 143 | } |
| 144 | |
| 145 | if (--frt->mNumReaders == 0) { |
| 146 | frt->mThreadShouldDie = 1; |
| 147 | frt->mGuard->Notify(frt->mGuard); /* wake up thread so it will quit */ |
| 148 | frt->mGuard->Wait(frt->mGuard); /* wait for thread to die */ |
| 149 | } |
| 150 | |
| 151 | if (bNeedsRelease) frt->mGuard->Unlock(frt->mGuard); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | static int FileReaderThread_StartFixedPriorityThread (FileReaderThread *frt) |
| 156 | { |
| 157 | pthread_attr_t theThreadAttrs; |
| 158 | pthread_t pThread; |
| 159 | |
| 160 | OSStatus result = pthread_attr_init(&theThreadAttrs); |
| 161 | if (result) return 0; /*THROW_RESULT("pthread_attr_init - Thread attributes could not be created.")*/ |
| 162 | |
| 163 | result = pthread_attr_setdetachstate(&theThreadAttrs, PTHREAD_CREATE_DETACHED); |
| 164 | if (result) return 0; /*THROW_RESULT("pthread_attr_setdetachstate - Thread attributes could not be detached.")*/ |
| 165 | |
| 166 | result = pthread_create (&pThread, &theThreadAttrs, frt->DiskReaderEntry, frt); |
| 167 | if (result) return 0; /*THROW_RESULT("pthread_create - Create and start the thread.")*/ |
| 168 | |
| 169 | pthread_attr_destroy(&theThreadAttrs); |
| 170 | |
| 171 | /* we've now created the thread and started it |
| 172 | we'll now set the priority of the thread to the nominated priority |
| 173 | and we'll also make the thread fixed */ |
| 174 | thread_extended_policy_data_t theFixedPolicy; |
| 175 | thread_precedence_policy_data_t thePrecedencePolicy; |
| 176 | SInt32 relativePriority; |
| 177 | |
| 178 | /* make thread fixed */ |
| 179 | theFixedPolicy.timeshare = 0; /* set to 1 for a non-fixed thread */ |
| 180 | result = thread_policy_set (pthread_mach_thread_np(pThread), THREAD_EXTENDED_POLICY, (thread_policy_t)&theFixedPolicy, THREAD_EXTENDED_POLICY_COUNT); |
| 181 | if (result) return 0; /*THROW_RESULT("thread_policy - Couldn't set thread as fixed priority.")*/ |
| 182 | /* set priority */ |
| 183 | /* precedency policy's "importance" value is relative to spawning thread's priority */ |
| 184 | relativePriority = frt->mThreadPriority - frt->GetThreadBasePriority(pthread_self()); |
| 185 | |
| 186 | thePrecedencePolicy.importance = relativePriority; |
| 187 | result = thread_policy_set (pthread_mach_thread_np(pThread), THREAD_PRECEDENCE_POLICY, (thread_policy_t)&thePrecedencePolicy, THREAD_PRECEDENCE_POLICY_COUNT); |
| 188 | if (result) return 0; /*THROW_RESULT("thread_policy - Couldn't set thread priority.")*/ |
| 189 | |
| 190 | return 1; |
| 191 | } |
| 192 | |
| 193 | static UInt32 FileReaderThread_GetThreadBasePriority (pthread_t inThread) |
| 194 | { |
| 195 | thread_basic_info_data_t threadInfo; |
| 196 | policy_info_data_t thePolicyInfo; |
| 197 | unsigned int count; |
| 198 | |
| 199 | /* get basic info */ |
| 200 | count = THREAD_BASIC_INFO_COUNT; |
| 201 | thread_info (pthread_mach_thread_np (inThread), THREAD_BASIC_INFO, (integer_t*)&threadInfo, &count); |
| 202 | |
| 203 | switch (threadInfo.policy) { |
| 204 | case POLICY_TIMESHARE: |
| 205 | count = POLICY_TIMESHARE_INFO_COUNT; |
| 206 | thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_TIMESHARE_INFO, (integer_t*)&(thePolicyInfo.ts), &count); |
| 207 | return thePolicyInfo.ts.base_priority; |
| 208 | break; |
| 209 | |
| 210 | case POLICY_FIFO: |
| 211 | count = POLICY_FIFO_INFO_COUNT; |
| 212 | thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_FIFO_INFO, (integer_t*)&(thePolicyInfo.fifo), &count); |
| 213 | if (thePolicyInfo.fifo.depressed) { |
| 214 | return thePolicyInfo.fifo.depress_priority; |
| 215 | } else { |
| 216 | return thePolicyInfo.fifo.base_priority; |
| 217 | } |
| 218 | break; |
| 219 | |
| 220 | case POLICY_RR: |
| 221 | count = POLICY_RR_INFO_COUNT; |
| 222 | thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_RR_INFO, (integer_t*)&(thePolicyInfo.rr), &count); |
| 223 | if (thePolicyInfo.rr.depressed) { |
| 224 | return thePolicyInfo.rr.depress_priority; |
| 225 | } else { |
| 226 | return thePolicyInfo.rr.base_priority; |
| 227 | } |
| 228 | break; |
| 229 | } |
| 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | static void *FileReaderThread_DiskReaderEntry (void *inRefCon) |
| 235 | { |
| 236 | FileReaderThread *frt = (FileReaderThread *)inRefCon; |
| 237 | frt->ReadNextChunk(frt); |
| 238 | #if DEBUG |
| 239 | printf ("finished with reading file\n"); |
| 240 | #endif |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static void FileReaderThread_ReadNextChunk (FileReaderThread *frt) |
| 246 | { |
| 247 | OSStatus result; |
| 248 | ByteCount dataChunkSize; |
| 249 | AudioFileManager* theItem = 0; |
| 250 | |
| 251 | for (;;) |
| 252 | { |
| 253 | { /* this is a scoped based lock */ |
| 254 | int bNeedsRelease = frt->mGuard->Lock(frt->mGuard); |
| 255 | |
| 256 | if (frt->mThreadShouldDie) { |
| 257 | frt->mGuard->Notify(frt->mGuard); |
| 258 | if (bNeedsRelease) frt->mGuard->Unlock(frt->mGuard); |
| 259 | return; |
| 260 | } |
| 261 | |
| 262 | /*if (frt->mFileData.empty())*/ |
| 263 | if (frt->mFileData == NULL) |
| 264 | { |
| 265 | frt->mGuard->Wait(frt->mGuard); |
| 266 | } |
| 267 | |
| 268 | /* kill thread */ |
| 269 | if (frt->mThreadShouldDie) { |
| 270 | |
| 271 | frt->mGuard->Notify(frt->mGuard); |
| 272 | if (bNeedsRelease) frt->mGuard->Unlock(frt->mGuard); |
| 273 | return; |
| 274 | } |
| 275 | |
| 276 | /*theItem = frt->mFileData.front();*/ |
| 277 | /*frt->mFileData.pop_front();*/ |
| 278 | theItem = NULL; |
| 279 | if (frt->mFileData != NULL) |
| 280 | { |
| 281 | FileData *next = frt->mFileData->next; |
| 282 | theItem = frt->mFileData->obj; |
| 283 | SDL_free(frt->mFileData); |
| 284 | frt->mFileData = next; |
| 285 | } |
| 286 | |
| 287 | if (bNeedsRelease) frt->mGuard->Unlock(frt->mGuard); |
| 288 | } |
| 289 | |
| 290 | if ((theItem->mFileLength - theItem->mReadFilePosition) < theItem->mChunkSize) |
| 291 | dataChunkSize = theItem->mFileLength - theItem->mReadFilePosition; |
| 292 | else |
| 293 | dataChunkSize = theItem->mChunkSize; |
| 294 | |
| 295 | /* this is the exit condition for the thread */ |
| 296 | if (dataChunkSize <= 0) { |
| 297 | theItem->mFinishedReadingData = 1; |
| 298 | continue; |
| 299 | } |
| 300 | /* construct pointer */ |
| 301 | char* writePtr = (char *) (theItem->GetFileBuffer(theItem) + |
| 302 | (theItem->mWriteToFirstBuffer ? 0 : theItem->mChunkSize)); |
| 303 | |
| 304 | /* read data */ |
| 305 | result = theItem->Read(theItem, writePtr, &dataChunkSize); |
| 306 | if (result != noErr && result != eofErr) { |
| 307 | AudioFilePlayer *afp = (AudioFilePlayer *) theItem->GetParent(theItem); |
| 308 | afp->DoNotification(afp, result); |
| 309 | continue; |
| 310 | } |
| 311 | |
| 312 | if (dataChunkSize != theItem->mChunkSize) |
| 313 | { |
| 314 | writePtr += dataChunkSize; |
| 315 | |
| 316 | /* can't exit yet.. we still have to pass the partial buffer back */ |
| 317 | SDL_memset(writePtr, 0, (theItem->mChunkSize - dataChunkSize)); |
| 318 | } |
| 319 | |
| 320 | theItem->mWriteToFirstBuffer = !theItem->mWriteToFirstBuffer; /* switch buffers */ |
| 321 | |
| 322 | if (result == eofErr) |
| 323 | theItem->mReadFilePosition = theItem->mFileLength; |
| 324 | else |
| 325 | theItem->mReadFilePosition += dataChunkSize; /* increment count */ |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | void delete_FileReaderThread(FileReaderThread *frt) |
| 330 | { |
| 331 | if (frt != NULL) |
| 332 | { |
| 333 | delete_SDLOSXCAGuard(frt->mGuard); |
| 334 | SDL_free(frt); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | FileReaderThread *new_FileReaderThread () |
| 339 | { |
| 340 | FileReaderThread *frt = (FileReaderThread *) SDL_malloc(sizeof (FileReaderThread)); |
| 341 | if (frt == NULL) |
| 342 | return NULL; |
| 343 | SDL_memset(frt, '\0', sizeof (*frt)); |
| 344 | |
| 345 | frt->mGuard = new_SDLOSXCAGuard(); |
| 346 | if (frt->mGuard == NULL) |
| 347 | { |
| 348 | SDL_free(frt); |
| 349 | return NULL; |
| 350 | } |
| 351 | |
| 352 | #define SET_FILEREADERTHREAD_METHOD(m) frt->m = FileReaderThread_##m |
| 353 | SET_FILEREADERTHREAD_METHOD(GetGuard); |
| 354 | SET_FILEREADERTHREAD_METHOD(AddReader); |
| 355 | SET_FILEREADERTHREAD_METHOD(RemoveReader); |
| 356 | SET_FILEREADERTHREAD_METHOD(TryNextRead); |
| 357 | SET_FILEREADERTHREAD_METHOD(ReadNextChunk); |
| 358 | SET_FILEREADERTHREAD_METHOD(StartFixedPriorityThread); |
| 359 | SET_FILEREADERTHREAD_METHOD(GetThreadBasePriority); |
| 360 | SET_FILEREADERTHREAD_METHOD(DiskReaderEntry); |
| 361 | #undef SET_FILEREADERTHREAD_METHOD |
| 362 | |
| 363 | frt->mThreadPriority = 62; |
| 364 | return frt; |
| 365 | } |
| 366 | |
| 367 | |
| 368 | static FileReaderThread *sReaderThread; |
| 369 | |
| 370 | |
| 371 | static int AudioFileManager_DoConnect (AudioFileManager *afm) |
| 372 | { |
| 373 | if (!afm->mIsEngaged) |
| 374 | { |
| 375 | OSStatus result; |
| 376 | |
| 377 | /*afm->mReadFilePosition = 0;*/ |
| 378 | afm->mFinishedReadingData = 0; |
| 379 | |
| 380 | afm->mNumTimesAskedSinceFinished = 0; |
| 381 | afm->mLockUnsuccessful = 0; |
| 382 | |
| 383 | ByteCount dataChunkSize; |
| 384 | |
| 385 | if ((afm->mFileLength - afm->mReadFilePosition) < afm->mChunkSize) |
| 386 | dataChunkSize = afm->mFileLength - afm->mReadFilePosition; |
| 387 | else |
| 388 | dataChunkSize = afm->mChunkSize; |
| 389 | |
| 390 | result = afm->Read(afm, afm->mFileBuffer, &dataChunkSize); |
| 391 | if (result) return 0; /*THROW_RESULT("AudioFileManager::DoConnect(): Read")*/ |
| 392 | |
| 393 | afm->mReadFilePosition += dataChunkSize; |
| 394 | |
| 395 | afm->mWriteToFirstBuffer = 0; |
| 396 | afm->mReadFromFirstBuffer = 1; |
| 397 | |
| 398 | sReaderThread->AddReader(sReaderThread); |
| 399 | |
| 400 | afm->mIsEngaged = 1; |
| 401 | } |
| 402 | /* |
| 403 | else |
| 404 | throw static_cast<OSStatus>(-1); */ /* thread has already been started */ |
| 405 | |
| 406 | return 1; |
| 407 | } |
| 408 | |
| 409 | static void AudioFileManager_Disconnect (AudioFileManager *afm) |
| 410 | { |
| 411 | if (afm->mIsEngaged) |
| 412 | { |
| 413 | sReaderThread->RemoveReader (sReaderThread, afm); |
| 414 | afm->mIsEngaged = 0; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | static OSStatus AudioFileManager_Read(AudioFileManager *afm, char *buffer, ByteCount *len) |
| 419 | { |
| 420 | return FSReadFork (afm->mForkRefNum, |
| 421 | fsFromStart, |
| 422 | afm->mReadFilePosition + afm->mAudioDataOffset, |
| 423 | *len, |
| 424 | buffer, |
| 425 | len); |
| 426 | } |
| 427 | |
| 428 | static OSStatus AudioFileManager_GetFileData (AudioFileManager *afm, void** inOutData, UInt32 *inOutDataSize) |
| 429 | { |
| 430 | if (afm->mFinishedReadingData) |
| 431 | { |
| 432 | ++afm->mNumTimesAskedSinceFinished; |
| 433 | *inOutDataSize = 0; |
| 434 | *inOutData = 0; |
| 435 | return noErr; |
| 436 | } |
| 437 | |
| 438 | if (afm->mReadFromFirstBuffer == afm->mWriteToFirstBuffer) { |
| 439 | #if DEBUG |
| 440 | printf ("* * * * * * * Can't keep up with reading file\n"); |
| 441 | #endif |
| 442 | |
| 443 | afm->mParent->DoNotification (afm->mParent, kAudioFilePlayErr_FilePlayUnderrun); |
| 444 | *inOutDataSize = 0; |
| 445 | *inOutData = 0; |
| 446 | } else { |
| 447 | *inOutDataSize = afm->mChunkSize; |
| 448 | *inOutData = afm->mReadFromFirstBuffer ? afm->mFileBuffer : (afm->mFileBuffer + afm->mChunkSize); |
| 449 | } |
| 450 | |
| 451 | afm->mLockUnsuccessful = !sReaderThread->TryNextRead (sReaderThread, afm); |
| 452 | |
| 453 | afm->mReadFromFirstBuffer = !afm->mReadFromFirstBuffer; |
| 454 | |
| 455 | return noErr; |
| 456 | } |
| 457 | |
| 458 | static void AudioFileManager_AfterRender (AudioFileManager *afm) |
| 459 | { |
| 460 | if (afm->mNumTimesAskedSinceFinished > 0) |
| 461 | { |
| 462 | int didLock = 0; |
| 463 | SDLOSXCAGuard *guard = sReaderThread->GetGuard(sReaderThread); |
| 464 | if (guard->Try(guard, &didLock)) { |
| 465 | afm->mParent->DoNotification (afm->mParent, kAudioFilePlay_FileIsFinished); |
| 466 | if (didLock) |
| 467 | guard->Unlock(guard); |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | if (afm->mLockUnsuccessful) |
| 472 | afm->mLockUnsuccessful = !sReaderThread->TryNextRead (sReaderThread, afm); |
| 473 | } |
| 474 | |
| 475 | static void AudioFileManager_SetPosition (AudioFileManager *afm, SInt64 pos) |
| 476 | { |
| 477 | if (pos < 0 || pos >= afm->mFileLength) { |
| 478 | SDL_SetError ("AudioFileManager::SetPosition - position invalid: %d filelen=%d\n", |
| 479 | (unsigned int)pos, (unsigned int)afm->mFileLength); |
| 480 | pos = 0; |
| 481 | } |
| 482 | |
| 483 | afm->mReadFilePosition = pos; |
| 484 | } |
| 485 | |
| 486 | static void AudioFileManager_SetEndOfFile (AudioFileManager *afm, SInt64 pos) |
| 487 | { |
| 488 | if (pos <= 0 || pos > afm->mFileLength) { |
| 489 | SDL_SetError ("AudioFileManager::SetEndOfFile - position beyond actual eof\n"); |
| 490 | pos = afm->mFileLength; |
| 491 | } |
| 492 | |
| 493 | afm->mFileLength = pos; |
| 494 | } |
| 495 | |
| 496 | static const char *AudioFileManager_GetFileBuffer(AudioFileManager *afm) |
| 497 | { |
| 498 | return afm->mFileBuffer; |
| 499 | } |
| 500 | |
| 501 | const AudioFilePlayer *AudioFileManager_GetParent(AudioFileManager *afm) |
| 502 | { |
| 503 | return afm->mParent; |
| 504 | } |
| 505 | |
| 506 | static int AudioFileManager_GetByteCounter(AudioFileManager *afm) |
| 507 | { |
| 508 | return afm->mByteCounter; |
| 509 | } |
| 510 | |
| 511 | static OSStatus AudioFileManager_FileInputProc (void *inRefCon, |
| 512 | AudioUnitRenderActionFlags *ioActionFlags, |
| 513 | const AudioTimeStamp *inTimeStamp, |
| 514 | UInt32 inBusNumber, |
| 515 | UInt32 inNumberFrames, |
| 516 | AudioBufferList *ioData) |
| 517 | { |
| 518 | AudioFileManager* afm = (AudioFileManager*)inRefCon; |
| 519 | return afm->Render(afm, ioData); |
| 520 | } |
| 521 | |
| 522 | static OSStatus AudioFileManager_Render (AudioFileManager *afm, AudioBufferList *ioData) |
| 523 | { |
| 524 | OSStatus result = noErr; |
| 525 | AudioBuffer *abuf; |
| 526 | UInt32 i; |
| 527 | |
| 528 | for (i = 0; i < ioData->mNumberBuffers; i++) { |
| 529 | abuf = &ioData->mBuffers[i]; |
| 530 | if (afm->mBufferOffset >= afm->mBufferSize) { |
| 531 | result = afm->GetFileData(afm, &afm->mTmpBuffer, &afm->mBufferSize); |
| 532 | if (result) { |
| 533 | SDL_SetError ("AudioConverterFillBuffer:%ld\n", result); |
| 534 | afm->mParent->DoNotification(afm->mParent, result); |
| 535 | return result; |
| 536 | } |
| 537 | |
| 538 | afm->mBufferOffset = 0; |
| 539 | } |
| 540 | |
| 541 | if (abuf->mDataByteSize > afm->mBufferSize - afm->mBufferOffset) |
| 542 | abuf->mDataByteSize = afm->mBufferSize - afm->mBufferOffset; |
| 543 | abuf->mData = (char *)afm->mTmpBuffer + afm->mBufferOffset; |
| 544 | afm->mBufferOffset += abuf->mDataByteSize; |
| 545 | |
| 546 | afm->mByteCounter += abuf->mDataByteSize; |
| 547 | afm->AfterRender(afm); |
| 548 | } |
| 549 | return result; |
| 550 | } |
| 551 | |
| 552 | |
| 553 | void delete_AudioFileManager (AudioFileManager *afm) |
| 554 | { |
| 555 | if (afm != NULL) { |
| 556 | if (afm->mFileBuffer) { |
| 557 | free(afm->mFileBuffer); |
| 558 | } |
| 559 | |
| 560 | SDL_free(afm); |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | |
| 565 | AudioFileManager *new_AudioFileManager(AudioFilePlayer *inParent, |
| 566 | SInt16 inForkRefNum, |
| 567 | SInt64 inFileLength, |
| 568 | UInt32 inChunkSize) |
| 569 | { |
| 570 | AudioFileManager *afm; |
| 571 | |
| 572 | if (sReaderThread == NULL) |
| 573 | { |
| 574 | sReaderThread = new_FileReaderThread(); |
| 575 | if (sReaderThread == NULL) |
| 576 | return NULL; |
| 577 | } |
| 578 | |
| 579 | afm = (AudioFileManager *) SDL_malloc(sizeof (AudioFileManager)); |
| 580 | if (afm == NULL) |
| 581 | return NULL; |
| 582 | SDL_memset(afm, '\0', sizeof (*afm)); |
| 583 | |
| 584 | #define SET_AUDIOFILEMANAGER_METHOD(m) afm->m = AudioFileManager_##m |
| 585 | SET_AUDIOFILEMANAGER_METHOD(Disconnect); |
| 586 | SET_AUDIOFILEMANAGER_METHOD(DoConnect); |
| 587 | SET_AUDIOFILEMANAGER_METHOD(Read); |
| 588 | SET_AUDIOFILEMANAGER_METHOD(GetFileBuffer); |
| 589 | SET_AUDIOFILEMANAGER_METHOD(GetParent); |
| 590 | SET_AUDIOFILEMANAGER_METHOD(SetPosition); |
| 591 | SET_AUDIOFILEMANAGER_METHOD(GetByteCounter); |
| 592 | SET_AUDIOFILEMANAGER_METHOD(SetEndOfFile); |
| 593 | SET_AUDIOFILEMANAGER_METHOD(Render); |
| 594 | SET_AUDIOFILEMANAGER_METHOD(GetFileData); |
| 595 | SET_AUDIOFILEMANAGER_METHOD(AfterRender); |
| 596 | SET_AUDIOFILEMANAGER_METHOD(FileInputProc); |
| 597 | #undef SET_AUDIOFILEMANAGER_METHOD |
| 598 | |
| 599 | afm->mParent = inParent; |
| 600 | afm->mForkRefNum = inForkRefNum; |
| 601 | afm->mBufferSize = inChunkSize; |
| 602 | afm->mBufferOffset = inChunkSize; |
| 603 | afm->mChunkSize = inChunkSize; |
| 604 | afm->mFileLength = inFileLength; |
| 605 | afm->mFileBuffer = (char*) SDL_malloc(afm->mChunkSize * 2); |
| 606 | FSGetForkPosition(afm->mForkRefNum, &afm->mAudioDataOffset); |
| 607 | assert (afm->mFileBuffer != NULL); |
| 608 | return afm; |
| 609 | } |
| 610 | |