Buffer* BufferManager::getCurrentBuffer(__int32 minimumSize, bool forceNewBuffer) {
Buffer* result = NULL;
if (!_activeBuffers->empty()) {
result = _activeBuffers->back();
// because some other action could change the currentPos
// we should ensure its in the right place before returning the buffer
result->seek(result->currentPos());
}
if ((forceNewBuffer) || (result == NULL)
|| (result->spaceLeft() < minimumSize)) {
bool newBuffer;
int flag = 0x01;
// Active buffer
if (_reusableBuffers->empty()) {
result = createNewBuffer();
newBuffer = true;
} else {
result = _reusableBuffers->front();
_reusableBuffers->pop();
result->reset();
newBuffer = false;
}
addBuffer(result);
result->seek(0);
registerBufferControlFile(result, newBuffer, flag);
}
return result;
}
AMRDeinterleavingBuffer
::AMRDeinterleavingBuffer(unsigned numChannels, unsigned maxInterleaveGroupSize)
: fNumChannels(numChannels), fMaxInterleaveGroupSize(maxInterleaveGroupSize),
fIncomingBankId(0), fIncomingBinMax(0),
fOutgoingBinMax(0), fNextOutgoingBin(0),
fHaveSeenPackets(False), fNumSuccessiveSyncedFrames(0), fILL(0) {
// Use two banks of descriptors - one for incoming, one for outgoing
fFrames[0] = new FrameDescriptor[fMaxInterleaveGroupSize];
fFrames[1] = new FrameDescriptor[fMaxInterleaveGroupSize];
fInputBuffer = createNewBuffer();
}
void AMRDeinterleavingBuffer
::deliverIncomingFrame(unsigned frameSize, RawAMRRTPSource* source,
struct timeval presentationTime) {
fILL = source->ILL();
unsigned char const ILP = source->ILP();
unsigned frameIndex = source->frameIndex();
unsigned short packetSeqNum = source->curPacketRTPSeqNum();
// First perform a sanity check on the parameters:
// (This is overkill, as the source should have already done this.)
if (ILP > fILL || frameIndex == 0) {
#ifdef DEBUG
fprintf(stderr, "AMRDeinterleavingBuffer::deliverIncomingFrame() param sanity check failed (%d,%d,%d,%d)\n", frameSize, fILL, ILP, frameIndex);
#endif
source->envir().internalError();
}
--frameIndex; // because it was incremented by the source when this frame was read
u_int8_t frameHeader;
if (frameIndex >= source->TOCSize()) { // sanity check
frameHeader = FT_NO_DATA<<3;
} else {
frameHeader = source->TOC()[frameIndex];
}
unsigned frameBlockIndex = frameIndex/fNumChannels;
unsigned frameWithinFrameBlock = frameIndex%fNumChannels;
// The input "presentationTime" was that of the first frame-block in this
// packet. Update it for the current frame:
unsigned uSecIncrement = frameBlockIndex*(fILL+1)*uSecsPerFrame;
presentationTime.tv_usec += uSecIncrement;
presentationTime.tv_sec += presentationTime.tv_usec/1000000;
presentationTime.tv_usec = presentationTime.tv_usec%1000000;
// Next, check whether this packet is part of a new interleave group
if (!fHaveSeenPackets
|| seqNumLT(fLastPacketSeqNumForGroup, packetSeqNum + frameBlockIndex)) {
// We've moved to a new interleave group
#ifdef DEBUG
fprintf(stderr, "AMRDeinterleavingBuffer::deliverIncomingFrame(): new interleave group\n");
#endif
fHaveSeenPackets = True;
fLastPacketSeqNumForGroup = packetSeqNum + fILL - ILP;
// Switch the incoming and outgoing banks:
fIncomingBankId ^= 1;
unsigned char tmp = fIncomingBinMax;
fIncomingBinMax = fOutgoingBinMax;
fOutgoingBinMax = tmp;
fNextOutgoingBin = 0;
}
// Now move the incoming frame into the appropriate bin:
unsigned const binNumber
= ((ILP + frameBlockIndex*(fILL+1))*fNumChannels + frameWithinFrameBlock)
% fMaxInterleaveGroupSize; // the % is for sanity
#ifdef DEBUG
fprintf(stderr, "AMRDeinterleavingBuffer::deliverIncomingFrame(): frameIndex %d (%d,%d) put in bank %d, bin %d (%d): size %d, header 0x%02x, presentationTime %lu.%06ld\n", frameIndex, frameBlockIndex, frameWithinFrameBlock, fIncomingBankId, binNumber, fMaxInterleaveGroupSize, frameSize, frameHeader, presentationTime.tv_sec, presentationTime.tv_usec);
#endif
FrameDescriptor& inBin = fFrames[fIncomingBankId][binNumber];
unsigned char* curBuffer = inBin.frameData;
inBin.frameData = fInputBuffer;
inBin.frameSize = frameSize;
inBin.frameHeader = frameHeader;
inBin.presentationTime = presentationTime;
inBin.fIsSynchronized = ((RTPSource*)source)->RTPSource::hasBeenSynchronizedUsingRTCP();
if (curBuffer == NULL) curBuffer = createNewBuffer();
fInputBuffer = curBuffer;
if (binNumber >= fIncomingBinMax) {
fIncomingBinMax = binNumber + 1;
}
}
