void FileReaderThread::RemoveReader (const FileThreadVariables* inItem)
{
if (mNumReaders > 0)
{
CAGuard::Locker fileReadLock (mGuard);
for (FileData::iterator iter = mFileData.begin(); iter != mFileData.end(); ++iter)
{
if ((*iter) == inItem) {
mFileData.erase (iter);
}
}
if (--mNumReaders == 0) {
mThreadShouldDie = true;
mGuard.Notify();
}
}
}
void FileReaderThread::ReadNextChunk ()
{
OSStatus result;
UInt32 dataChunkSize;
UInt32 dataChunkSizeInPackets;
AudioStreamPacketDescription *packetDescriptions = NULL;
FileThreadVariables* theItem = 0;
for (;;)
{
{ // this is a scoped based lock
CAGuard::Locker fileReadLock (mGuard);
if (mThreadShouldDie) return;
while (mFileData.empty()) {
fileReadLock.Wait();
}
// kill thread
if (mThreadShouldDie) return;
theItem = mFileData[0];
mFileData.erase (mFileData.begin());
}
packetDescriptions = theItem->mPacketDescriptions;
if (!theItem->mWriteToFirstBuffer)
packetDescriptions += theItem->mChunkSizeInPackets;
if ((theItem->mPacketCount - theItem->mReadPacketPosition) < theItem->mChunkSizeInPackets)
{
dataChunkSizeInPackets = theItem->mPacketCount - theItem->mReadPacketPosition;
if (!theItem->IsLooping()) {
theItem->mFinishedReadingData = true;
}
}
else
dataChunkSizeInPackets = theItem->mChunkSizeInPackets;
// this is the exit condition for the thread
if (dataChunkSizeInPackets == 0 && !theItem->IsLooping()) {
theItem->mFinishedReadingData = true;
continue;
}
// construct pointer
char* writePtr = const_cast<char*>(theItem->GetFileBuffer() +
(theItem->mWriteToFirstBuffer ? 0 : theItem->mChunkSizeInPackets * theItem->mMaxPacketSize));
#if LOG_DATA_FLOW
fprintf(stdout, "***** ReadNextChunk(1) - AFReadPackets (pkts/offset) = %ld/%qd\n", dataChunkSizeInPackets, theItem->mReadPacketPosition);
#endif
result = AudioFileReadPackets (theItem->GetFileID(),
false,
&dataChunkSize,
packetDescriptions,
theItem->mReadPacketPosition,
&dataChunkSizeInPackets,
writePtr);
if (result) {
theItem->GetParent().DoNotification(result);
continue;
}
theItem->mCurrentPacketCountInBuffer = dataChunkSizeInPackets;
theItem->mCurrentByteCountInBuffer = dataChunkSize;
if (dataChunkSizeInPackets != theItem->mChunkSizeInPackets)
{
writePtr += dataChunkSize;
packetDescriptions += dataChunkSizeInPackets;
if (theItem->IsLooping())
{
packetDescriptions = theItem->mPacketDescriptions + dataChunkSizeInPackets;
dataChunkSizeInPackets = theItem->mChunkSizeInPackets - dataChunkSizeInPackets;
theItem->mReadPacketPosition = 0;
#if LOG_DATA_FLOW
fprintf(stdout, "***** ReadNextChunk(2) - AFReadPackets (pkts/offset) = %ld/%qd\n", dataChunkSizeInPackets, theItem->mReadPacketPosition);
#endif
result = AudioFileReadPackets (theItem->GetFileID(),
false,
&dataChunkSize,
packetDescriptions,
theItem->mReadPacketPosition,
&dataChunkSizeInPackets,
writePtr);
if (result) {
theItem->GetParent().DoNotification(result);
continue;
}
theItem->mCurrentPacketCountInBuffer += dataChunkSizeInPackets;
theItem->mCurrentByteCountInBuffer += dataChunkSize;
}
else
{
// can't exit yet.. we still have to pass the partial buffer back
memset (writePtr, 0, ((theItem->mChunkSizeInPackets - dataChunkSizeInPackets) * theItem->mMaxPacketSize));
}
}
theItem->mWriteToFirstBuffer = !theItem->mWriteToFirstBuffer; // switch buffers
theItem->mReadPacketPosition += dataChunkSizeInPackets; // increment count
}
}