diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/cdrom/macosx/AudioFileReaderThread.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/cdrom/macosx/AudioFileReaderThread.c | 610 |
1 files changed, 610 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/cdrom/macosx/AudioFileReaderThread.c b/distrib/sdl-1.2.15/src/cdrom/macosx/AudioFileReaderThread.c new file mode 100644 index 0000000..0007c07 --- /dev/null +++ b/distrib/sdl-1.2.15/src/cdrom/macosx/AudioFileReaderThread.c @@ -0,0 +1,610 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this library; if not, write to the Free + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + Sam Lantinga + slouken@libsdl.org + + This file based on Apple sample code. We haven't changed the file name, + so if you want to see the original search for it on apple.com/developer +*/ +#include "SDL_config.h" + +/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + AudioFileManager.cpp +*/ +#include "AudioFilePlayer.h" +#include <mach/mach.h> /* used for setting policy of thread */ +#include "SDLOSXCAGuard.h" +#include <pthread.h> + +/*#include <list>*/ + +/*typedef void *FileData;*/ +typedef struct S_FileData +{ + AudioFileManager *obj; + struct S_FileData *next; +} FileData; + + +typedef struct S_FileReaderThread { +/*public:*/ + SDLOSXCAGuard* (*GetGuard)(struct S_FileReaderThread *frt); + void (*AddReader)(struct S_FileReaderThread *frt); + void (*RemoveReader)(struct S_FileReaderThread *frt, AudioFileManager* inItem); + int (*TryNextRead)(struct S_FileReaderThread *frt, AudioFileManager* inItem); + + int mThreadShouldDie; + +/*private:*/ + /*typedef std::list<AudioFileManager*> FileData;*/ + + SDLOSXCAGuard *mGuard; + UInt32 mThreadPriority; + + int mNumReaders; + FileData *mFileData; + + + void (*ReadNextChunk)(struct S_FileReaderThread *frt); + int (*StartFixedPriorityThread)(struct S_FileReaderThread *frt); + /*static*/ + UInt32 (*GetThreadBasePriority)(pthread_t inThread); + /*static*/ + void* (*DiskReaderEntry)(void *inRefCon); +} FileReaderThread; + + +static SDLOSXCAGuard* FileReaderThread_GetGuard(FileReaderThread *frt) +{ + return frt->mGuard; +} + +/* returns 1 if succeeded */ +static int FileReaderThread_TryNextRead (FileReaderThread *frt, AudioFileManager* inItem) +{ + int didLock = 0; + int succeeded = 0; + if (frt->mGuard->Try(frt->mGuard, &didLock)) + { + /*frt->mFileData.push_back (inItem);*/ + /* !!! FIXME: this could be faster with a "tail" member. --ryan. */ + FileData *i = frt->mFileData; + FileData *prev = NULL; + + FileData *newfd = (FileData *) SDL_malloc(sizeof (FileData)); + newfd->obj = inItem; + newfd->next = NULL; + + while (i != NULL) { prev = i; i = i->next; } + if (prev == NULL) + frt->mFileData = newfd; + else + prev->next = newfd; + + frt->mGuard->Notify(frt->mGuard); + succeeded = 1; + + if (didLock) + frt->mGuard->Unlock(frt->mGuard); + } + + return succeeded; +} + +static void FileReaderThread_AddReader(FileReaderThread *frt) +{ + if (frt->mNumReaders == 0) + { + frt->mThreadShouldDie = 0; + frt->StartFixedPriorityThread (frt); + } + frt->mNumReaders++; +} + +static void FileReaderThread_RemoveReader (FileReaderThread *frt, AudioFileManager* inItem) +{ + if (frt->mNumReaders > 0) + { + int bNeedsRelease = frt->mGuard->Lock(frt->mGuard); + + /*frt->mFileData.remove (inItem);*/ + FileData *i = frt->mFileData; + FileData *prev = NULL; + while (i != NULL) + { + FileData *next = i->next; + if (i->obj != inItem) + prev = i; + else + { + if (prev == NULL) + frt->mFileData = next; + else + prev->next = next; + SDL_free(i); + } + i = next; + } + + if (--frt->mNumReaders == 0) { + frt->mThreadShouldDie = 1; + frt->mGuard->Notify(frt->mGuard); /* wake up thread so it will quit */ + frt->mGuard->Wait(frt->mGuard); /* wait for thread to die */ + } + + if (bNeedsRelease) frt->mGuard->Unlock(frt->mGuard); + } +} + +static int FileReaderThread_StartFixedPriorityThread (FileReaderThread *frt) +{ + pthread_attr_t theThreadAttrs; + pthread_t pThread; + + OSStatus result = pthread_attr_init(&theThreadAttrs); + if (result) return 0; /*THROW_RESULT("pthread_attr_init - Thread attributes could not be created.")*/ + + result = pthread_attr_setdetachstate(&theThreadAttrs, PTHREAD_CREATE_DETACHED); + if (result) return 0; /*THROW_RESULT("pthread_attr_setdetachstate - Thread attributes could not be detached.")*/ + + result = pthread_create (&pThread, &theThreadAttrs, frt->DiskReaderEntry, frt); + if (result) return 0; /*THROW_RESULT("pthread_create - Create and start the thread.")*/ + + pthread_attr_destroy(&theThreadAttrs); + + /* we've now created the thread and started it + we'll now set the priority of the thread to the nominated priority + and we'll also make the thread fixed */ + thread_extended_policy_data_t theFixedPolicy; + thread_precedence_policy_data_t thePrecedencePolicy; + SInt32 relativePriority; + + /* make thread fixed */ + theFixedPolicy.timeshare = 0; /* set to 1 for a non-fixed thread */ + result = thread_policy_set (pthread_mach_thread_np(pThread), THREAD_EXTENDED_POLICY, (thread_policy_t)&theFixedPolicy, THREAD_EXTENDED_POLICY_COUNT); + if (result) return 0; /*THROW_RESULT("thread_policy - Couldn't set thread as fixed priority.")*/ + /* set priority */ + /* precedency policy's "importance" value is relative to spawning thread's priority */ + relativePriority = frt->mThreadPriority - frt->GetThreadBasePriority(pthread_self()); + + thePrecedencePolicy.importance = relativePriority; + result = thread_policy_set (pthread_mach_thread_np(pThread), THREAD_PRECEDENCE_POLICY, (thread_policy_t)&thePrecedencePolicy, THREAD_PRECEDENCE_POLICY_COUNT); + if (result) return 0; /*THROW_RESULT("thread_policy - Couldn't set thread priority.")*/ + + return 1; +} + +static UInt32 FileReaderThread_GetThreadBasePriority (pthread_t inThread) +{ + thread_basic_info_data_t threadInfo; + policy_info_data_t thePolicyInfo; + unsigned int count; + + /* get basic info */ + count = THREAD_BASIC_INFO_COUNT; + thread_info (pthread_mach_thread_np (inThread), THREAD_BASIC_INFO, (integer_t*)&threadInfo, &count); + + switch (threadInfo.policy) { + case POLICY_TIMESHARE: + count = POLICY_TIMESHARE_INFO_COUNT; + thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_TIMESHARE_INFO, (integer_t*)&(thePolicyInfo.ts), &count); + return thePolicyInfo.ts.base_priority; + break; + + case POLICY_FIFO: + count = POLICY_FIFO_INFO_COUNT; + thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_FIFO_INFO, (integer_t*)&(thePolicyInfo.fifo), &count); + if (thePolicyInfo.fifo.depressed) { + return thePolicyInfo.fifo.depress_priority; + } else { + return thePolicyInfo.fifo.base_priority; + } + break; + + case POLICY_RR: + count = POLICY_RR_INFO_COUNT; + thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_RR_INFO, (integer_t*)&(thePolicyInfo.rr), &count); + if (thePolicyInfo.rr.depressed) { + return thePolicyInfo.rr.depress_priority; + } else { + return thePolicyInfo.rr.base_priority; + } + break; + } + + return 0; +} + +static void *FileReaderThread_DiskReaderEntry (void *inRefCon) +{ + FileReaderThread *frt = (FileReaderThread *)inRefCon; + frt->ReadNextChunk(frt); + #if DEBUG + printf ("finished with reading file\n"); + #endif + + return 0; +} + +static void FileReaderThread_ReadNextChunk (FileReaderThread *frt) +{ + OSStatus result; + ByteCount dataChunkSize; + AudioFileManager* theItem = 0; + + for (;;) + { + { /* this is a scoped based lock */ + int bNeedsRelease = frt->mGuard->Lock(frt->mGuard); + + if (frt->mThreadShouldDie) { + frt->mGuard->Notify(frt->mGuard); + if (bNeedsRelease) frt->mGuard->Unlock(frt->mGuard); + return; + } + + /*if (frt->mFileData.empty())*/ + if (frt->mFileData == NULL) + { + frt->mGuard->Wait(frt->mGuard); + } + + /* kill thread */ + if (frt->mThreadShouldDie) { + + frt->mGuard->Notify(frt->mGuard); + if (bNeedsRelease) frt->mGuard->Unlock(frt->mGuard); + return; + } + + /*theItem = frt->mFileData.front();*/ + /*frt->mFileData.pop_front();*/ + theItem = NULL; + if (frt->mFileData != NULL) + { + FileData *next = frt->mFileData->next; + theItem = frt->mFileData->obj; + SDL_free(frt->mFileData); + frt->mFileData = next; + } + + if (bNeedsRelease) frt->mGuard->Unlock(frt->mGuard); + } + + if ((theItem->mFileLength - theItem->mReadFilePosition) < theItem->mChunkSize) + dataChunkSize = theItem->mFileLength - theItem->mReadFilePosition; + else + dataChunkSize = theItem->mChunkSize; + + /* this is the exit condition for the thread */ + if (dataChunkSize <= 0) { + theItem->mFinishedReadingData = 1; + continue; + } + /* construct pointer */ + char* writePtr = (char *) (theItem->GetFileBuffer(theItem) + + (theItem->mWriteToFirstBuffer ? 0 : theItem->mChunkSize)); + + /* read data */ + result = theItem->Read(theItem, writePtr, &dataChunkSize); + if (result != noErr && result != eofErr) { + AudioFilePlayer *afp = (AudioFilePlayer *) theItem->GetParent(theItem); + afp->DoNotification(afp, result); + continue; + } + + if (dataChunkSize != theItem->mChunkSize) + { + writePtr += dataChunkSize; + + /* can't exit yet.. we still have to pass the partial buffer back */ + SDL_memset(writePtr, 0, (theItem->mChunkSize - dataChunkSize)); + } + + theItem->mWriteToFirstBuffer = !theItem->mWriteToFirstBuffer; /* switch buffers */ + + if (result == eofErr) + theItem->mReadFilePosition = theItem->mFileLength; + else + theItem->mReadFilePosition += dataChunkSize; /* increment count */ + } +} + +void delete_FileReaderThread(FileReaderThread *frt) +{ + if (frt != NULL) + { + delete_SDLOSXCAGuard(frt->mGuard); + SDL_free(frt); + } +} + +FileReaderThread *new_FileReaderThread () +{ + FileReaderThread *frt = (FileReaderThread *) SDL_malloc(sizeof (FileReaderThread)); + if (frt == NULL) + return NULL; + SDL_memset(frt, '\0', sizeof (*frt)); + + frt->mGuard = new_SDLOSXCAGuard(); + if (frt->mGuard == NULL) + { + SDL_free(frt); + return NULL; + } + + #define SET_FILEREADERTHREAD_METHOD(m) frt->m = FileReaderThread_##m + SET_FILEREADERTHREAD_METHOD(GetGuard); + SET_FILEREADERTHREAD_METHOD(AddReader); + SET_FILEREADERTHREAD_METHOD(RemoveReader); + SET_FILEREADERTHREAD_METHOD(TryNextRead); + SET_FILEREADERTHREAD_METHOD(ReadNextChunk); + SET_FILEREADERTHREAD_METHOD(StartFixedPriorityThread); + SET_FILEREADERTHREAD_METHOD(GetThreadBasePriority); + SET_FILEREADERTHREAD_METHOD(DiskReaderEntry); + #undef SET_FILEREADERTHREAD_METHOD + + frt->mThreadPriority = 62; + return frt; +} + + +static FileReaderThread *sReaderThread; + + +static int AudioFileManager_DoConnect (AudioFileManager *afm) +{ + if (!afm->mIsEngaged) + { + OSStatus result; + + /*afm->mReadFilePosition = 0;*/ + afm->mFinishedReadingData = 0; + + afm->mNumTimesAskedSinceFinished = 0; + afm->mLockUnsuccessful = 0; + + ByteCount dataChunkSize; + + if ((afm->mFileLength - afm->mReadFilePosition) < afm->mChunkSize) + dataChunkSize = afm->mFileLength - afm->mReadFilePosition; + else + dataChunkSize = afm->mChunkSize; + + result = afm->Read(afm, afm->mFileBuffer, &dataChunkSize); + if (result) return 0; /*THROW_RESULT("AudioFileManager::DoConnect(): Read")*/ + + afm->mReadFilePosition += dataChunkSize; + + afm->mWriteToFirstBuffer = 0; + afm->mReadFromFirstBuffer = 1; + + sReaderThread->AddReader(sReaderThread); + + afm->mIsEngaged = 1; + } + /* + else + throw static_cast<OSStatus>(-1); */ /* thread has already been started */ + + return 1; +} + +static void AudioFileManager_Disconnect (AudioFileManager *afm) +{ + if (afm->mIsEngaged) + { + sReaderThread->RemoveReader (sReaderThread, afm); + afm->mIsEngaged = 0; + } +} + +static OSStatus AudioFileManager_Read(AudioFileManager *afm, char *buffer, ByteCount *len) +{ + return FSReadFork (afm->mForkRefNum, + fsFromStart, + afm->mReadFilePosition + afm->mAudioDataOffset, + *len, + buffer, + len); +} + +static OSStatus AudioFileManager_GetFileData (AudioFileManager *afm, void** inOutData, UInt32 *inOutDataSize) +{ + if (afm->mFinishedReadingData) + { + ++afm->mNumTimesAskedSinceFinished; + *inOutDataSize = 0; + *inOutData = 0; + return noErr; + } + + if (afm->mReadFromFirstBuffer == afm->mWriteToFirstBuffer) { + #if DEBUG + printf ("* * * * * * * Can't keep up with reading file\n"); + #endif + + afm->mParent->DoNotification (afm->mParent, kAudioFilePlayErr_FilePlayUnderrun); + *inOutDataSize = 0; + *inOutData = 0; + } else { + *inOutDataSize = afm->mChunkSize; + *inOutData = afm->mReadFromFirstBuffer ? afm->mFileBuffer : (afm->mFileBuffer + afm->mChunkSize); + } + + afm->mLockUnsuccessful = !sReaderThread->TryNextRead (sReaderThread, afm); + + afm->mReadFromFirstBuffer = !afm->mReadFromFirstBuffer; + + return noErr; +} + +static void AudioFileManager_AfterRender (AudioFileManager *afm) +{ + if (afm->mNumTimesAskedSinceFinished > 0) + { + int didLock = 0; + SDLOSXCAGuard *guard = sReaderThread->GetGuard(sReaderThread); + if (guard->Try(guard, &didLock)) { + afm->mParent->DoNotification (afm->mParent, kAudioFilePlay_FileIsFinished); + if (didLock) + guard->Unlock(guard); + } + } + + if (afm->mLockUnsuccessful) + afm->mLockUnsuccessful = !sReaderThread->TryNextRead (sReaderThread, afm); +} + +static void AudioFileManager_SetPosition (AudioFileManager *afm, SInt64 pos) +{ + if (pos < 0 || pos >= afm->mFileLength) { + SDL_SetError ("AudioFileManager::SetPosition - position invalid: %d filelen=%d\n", + (unsigned int)pos, (unsigned int)afm->mFileLength); + pos = 0; + } + + afm->mReadFilePosition = pos; +} + +static void AudioFileManager_SetEndOfFile (AudioFileManager *afm, SInt64 pos) +{ + if (pos <= 0 || pos > afm->mFileLength) { + SDL_SetError ("AudioFileManager::SetEndOfFile - position beyond actual eof\n"); + pos = afm->mFileLength; + } + + afm->mFileLength = pos; +} + +static const char *AudioFileManager_GetFileBuffer(AudioFileManager *afm) +{ + return afm->mFileBuffer; +} + +const AudioFilePlayer *AudioFileManager_GetParent(AudioFileManager *afm) +{ + return afm->mParent; +} + +static int AudioFileManager_GetByteCounter(AudioFileManager *afm) +{ + return afm->mByteCounter; +} + +static OSStatus AudioFileManager_FileInputProc (void *inRefCon, + AudioUnitRenderActionFlags *ioActionFlags, + const AudioTimeStamp *inTimeStamp, + UInt32 inBusNumber, + UInt32 inNumberFrames, + AudioBufferList *ioData) +{ + AudioFileManager* afm = (AudioFileManager*)inRefCon; + return afm->Render(afm, ioData); +} + +static OSStatus AudioFileManager_Render (AudioFileManager *afm, AudioBufferList *ioData) +{ + OSStatus result = noErr; + AudioBuffer *abuf; + UInt32 i; + + for (i = 0; i < ioData->mNumberBuffers; i++) { + abuf = &ioData->mBuffers[i]; + if (afm->mBufferOffset >= afm->mBufferSize) { + result = afm->GetFileData(afm, &afm->mTmpBuffer, &afm->mBufferSize); + if (result) { + SDL_SetError ("AudioConverterFillBuffer:%ld\n", result); + afm->mParent->DoNotification(afm->mParent, result); + return result; + } + + afm->mBufferOffset = 0; + } + + if (abuf->mDataByteSize > afm->mBufferSize - afm->mBufferOffset) + abuf->mDataByteSize = afm->mBufferSize - afm->mBufferOffset; + abuf->mData = (char *)afm->mTmpBuffer + afm->mBufferOffset; + afm->mBufferOffset += abuf->mDataByteSize; + + afm->mByteCounter += abuf->mDataByteSize; + afm->AfterRender(afm); + } + return result; +} + + +void delete_AudioFileManager (AudioFileManager *afm) +{ + if (afm != NULL) { + if (afm->mFileBuffer) { + free(afm->mFileBuffer); + } + + SDL_free(afm); + } +} + + +AudioFileManager *new_AudioFileManager(AudioFilePlayer *inParent, + SInt16 inForkRefNum, + SInt64 inFileLength, + UInt32 inChunkSize) +{ + AudioFileManager *afm; + + if (sReaderThread == NULL) + { + sReaderThread = new_FileReaderThread(); + if (sReaderThread == NULL) + return NULL; + } + + afm = (AudioFileManager *) SDL_malloc(sizeof (AudioFileManager)); + if (afm == NULL) + return NULL; + SDL_memset(afm, '\0', sizeof (*afm)); + + #define SET_AUDIOFILEMANAGER_METHOD(m) afm->m = AudioFileManager_##m + SET_AUDIOFILEMANAGER_METHOD(Disconnect); + SET_AUDIOFILEMANAGER_METHOD(DoConnect); + SET_AUDIOFILEMANAGER_METHOD(Read); + SET_AUDIOFILEMANAGER_METHOD(GetFileBuffer); + SET_AUDIOFILEMANAGER_METHOD(GetParent); + SET_AUDIOFILEMANAGER_METHOD(SetPosition); + SET_AUDIOFILEMANAGER_METHOD(GetByteCounter); + SET_AUDIOFILEMANAGER_METHOD(SetEndOfFile); + SET_AUDIOFILEMANAGER_METHOD(Render); + SET_AUDIOFILEMANAGER_METHOD(GetFileData); + SET_AUDIOFILEMANAGER_METHOD(AfterRender); + SET_AUDIOFILEMANAGER_METHOD(FileInputProc); + #undef SET_AUDIOFILEMANAGER_METHOD + + afm->mParent = inParent; + afm->mForkRefNum = inForkRefNum; + afm->mBufferSize = inChunkSize; + afm->mBufferOffset = inChunkSize; + afm->mChunkSize = inChunkSize; + afm->mFileLength = inFileLength; + afm->mFileBuffer = (char*) SDL_malloc(afm->mChunkSize * 2); + FSGetForkPosition(afm->mForkRefNum, &afm->mAudioDataOffset); + assert (afm->mFileBuffer != NULL); + return afm; +} + |