//}}}
//{{{ InjectData
HavanaStatus_t HavanaDemux_c::InjectData (const unsigned char* Data,
unsigned int DataLength)
{
Buffer_t Buffer;
PlayerInputDescriptor_t* InputDescriptor;
//OS_LockMutex (&InputLock);
Player->GetInjectBuffer (&Buffer);
Buffer->ObtainMetaDataReference (Player->MetaDataInputDescriptorType, (void**)&InputDescriptor);
InputDescriptor->MuxType = MuxTypeTransportStream;
InputDescriptor->DemultiplexorContext = DemuxContext;
InputDescriptor->PlaybackTimeValid = false;
InputDescriptor->DecodeTimeValid = false;
InputDescriptor->DataSpecificFlags = 0;
Buffer->RegisterDataReference (DataLength, (void*)Data);
Buffer->SetUsedDataSize (DataLength);
Player->InjectData (PlayerPlayback, Buffer);
//OS_UnLockMutex (&InputLock);
return HavanaNoError;
}
////////////////////////////////////////////////////////////////////////////
///
/// Handle losing lock on the frame headers.
///
/// This function is called to handle the data that was spuriously accumulated
/// when the frame header was badly parsed.
///
/// In principle this function is quite simple. We allocate a new accumulation buffer and
/// use the currently accumulated data is the data source to run the elementary stream
/// state machine. There is however a little extra logic to get rid of recursion.
/// Specificially we change the error handling behaviour if this method is re-entered
/// so that there error is reported back to the already executing copy of the method.
///
/// \return Collator status code, CollatorNoError indicates success.
///
CollatorStatus_t Collator_PesAudio_c::HandleMissingNextFrameHeader(void)
{
CollatorStatus_t Status;
//
// Mark the collator as having lost frame lock.
// Yes! We really do want to do this before the re-entry checks.
//
CollatorState = SeekingSyncWord; // we really do want to do this before the re-entry checks
AccumulatedFrameReady = false;
//
// Check for re-entry
//
if (AlreadyHandlingMissingNextFrameHeader)
{
COLLATOR_DEBUG("Re-entered the error recovery handler, initiating stack unwind\n");
return CollatorUnwindStack;
}
//
// Check whether the sub-class wants trivial or aggressive error recovery
//
if (!ReprocessAccumulatedDataDuringErrorRecovery)
{
DiscardAccumulatedData();
return CollatorNoError;
}
//
// Remember the original elementary stream pointers for when we return to 'normal' processing.
//
unsigned char *OldRemainingElementaryOrigin = RemainingElementaryOrigin;
unsigned char *OldRemainingElementaryData = RemainingElementaryData;
unsigned int OldRemainingElementaryLength = RemainingElementaryLength;
//
// Take ownership of the already accumulated data
//
Buffer_t ReprocessingDataBuffer = CodedFrameBuffer;
unsigned char *ReprocessingData = BufferBase;
unsigned int ReprocessingDataLength = AccumulatedDataSize;
ReprocessingDataBuffer->SetUsedDataSize(ReprocessingDataLength);
Status = ReprocessingDataBuffer->ShrinkBuffer(max(ReprocessingDataLength, 1));
if (Status != BufferNoError)
{
COLLATOR_ERROR("Failed to shrink the reprocessing buffer to size (%08x).\n", Status);
// not fatal - we're merely wasting memory
}
// At the time of writing GetNewBuffer() doesn't check for leaks. This is good because otherwise
// we wouldn't have transfer the ownership of the ReprocessingDataBuffer by making this call.
Status = GetNewBuffer();
if (Status != CollatorNoError)
{
COLLATOR_ERROR("Cannot get new buffer during error recovery\n");
return CollatorError;
}
//
// Remember that we are re-processing the previously accumulated elementary stream
//
AlreadyHandlingMissingNextFrameHeader = true;
//
// WARNING: From this point on we own the ReprocessingDataBuffer, have set the recursion avoidance
// marker and may have damaged the RemainingElementaryData pointer. There should be no
// short-circuit exit paths used after this point otherwise we risk avoiding the clean up
// at the bottom of the method.
//
while (ReprocessingDataLength > 1)
{
//
// Remove the first byte from the recovery buffer (to avoid detecting again the same start code).
//
ReprocessingData += 1;
ReprocessingDataLength -= 1;
//
// Search for a start code in the reprocessing data. This allows us to throw away data that we
// know will never need reprocessing which makes the recursion avoidance code more efficient.
//
RemainingElementaryOrigin = ReprocessingData;
RemainingElementaryData = ReprocessingData;
RemainingElementaryLength = ReprocessingDataLength;
int CodeOffset;
PotentialFrameHeaderLength = 0; // ensure no (now voided) historic data is considered by sub-class
Status = FindNextSyncWord(&CodeOffset);
if (Status == CodecNoError)
{
COLLATOR_ASSERT(CodeOffset >= 0);
COLLATOR_DEBUG("Found start code during error recovery (byte %d of %d)\n",
CodeOffset, ReprocessingDataLength);
// We found a start code, snip off all preceding data
ReprocessingData += CodeOffset;
ReprocessingDataLength -= CodeOffset;
}
else
{
// We didn't find a start code, snip off everything except the last few bytes. This
// final fragment may contain a partial start code so we want to pass if through the
// elementary stream handler again.
unsigned FinalBytes = min(ReprocessingDataLength, FrameHeaderLength - 1);
COLLATOR_DEBUG("Found no start code during error recovery (processing final %d bytes of %d)\n",
ReprocessingDataLength, FinalBytes);
ReprocessingData += ReprocessingDataLength;
ReprocessingDataLength = FinalBytes;
ReprocessingData -= ReprocessingDataLength;
}
//
// Process the elementary stream
//
Status = HandleElementaryStream(ReprocessingDataLength, ReprocessingData);
if (CollatorNoError == Status)
{
COLLATOR_DEBUG("Error recovery completed, returning to normal processing\n");
// All data consumed and stored in the subsequent accumulation buffer
break; // Success will propagate when we return Status
}
else if (CollatorUnwindStack == Status)
{
COLLATOR_DEBUG("Stack unwound successfully, re-trying error recovery\n");
// We found a frame header but lost lock again... let's have another go
AccumulatedDataSize = 0; // make sure no accumulated data is carried round the loop
continue;
}
else
{
COLLATOR_ERROR("Error handling elementary stream during error recovery\n");
break; // Failure will propagate when we return Status
}
}
//
// Free the buffer we just consumed and restore the original elementary stream pointers
//
RemainingElementaryOrigin = OldRemainingElementaryOrigin;
RemainingElementaryData = OldRemainingElementaryData;
RemainingElementaryLength = OldRemainingElementaryLength;
(void) ReprocessingDataBuffer->DecrementReferenceCount(IdentifierCollator);
AlreadyHandlingMissingNextFrameHeader = false;
return Status;
}
