//------------------------------------------------
// Functions from CoreMedia.framework used in VTVideoDecodeAccelerator.
//------------------------------------------------
OSStatus CMBlockBufferCreateWithMemoryBlock(CFAllocatorRef structureAllocator, void *memoryBlock, size_t blockLength, CFAllocatorRef blockAllocator, const CMBlockBufferCustomBlockSource *customBlockSource, size_t offsetToData, size_t dataLength, CMBlockBufferFlags flags, CMBlockBufferRef *newBBufOut);
OSStatus CMBlockBufferReplaceDataBytes(const void *sourceBytes, CMBlockBufferRef destinationBuffer, size_t offsetIntoDestination, size_t dataLength);
OSStatus CMSampleBufferCreate(CFAllocatorRef allocator, CMBlockBufferRef dataBuffer, Boolean dataReady, CMSampleBufferMakeDataReadyCallback makeDataReadyCallback, void *makeDataReadyRefcon, CMFormatDescriptionRef formatDescription, CMItemCount numSamples, CMItemCount numSampleTimingEntries, const CMSampleTimingInfo *sampleTimingArray, CMItemCount numSampleSizeEntries, const size_t *sampleSizeArray, CMSampleBufferRef *sBufOut);
OSStatus CMVideoFormatDescriptionCreateFromH264ParameterSets(CFAllocatorRef allocator, size_t parameterSetCount, const uint8_t *const *parameterSetPointers, const size_t *parameterSetSizes, int NALUnitHeaderLength, CMFormatDescriptionRef *formatDescriptionOut);
CMVideoDimensions CMVideoFormatDescriptionGetDimensions(CMVideoFormatDescriptionRef videoDesc);

//------------------------------------------------
// Functions from VideoToolbox.framework used in VTVideoDecodeAccelerator.
//------------------------------------------------
OSStatus VTDecompressionSessionCreate(CFAllocatorRef allocator, CMVideoFormatDescriptionRef videoFormatDescription, CFDictionaryRef videoDecoderSpecification, CFDictionaryRef destinationImageBufferAttributes, const VTDecompressionOutputCallbackRecord *outputCallback, VTDecompressionSessionRef *decompressionSessionOut);
OSStatus VTDecompressionSessionDecodeFrame(VTDecompressionSessionRef session, CMSampleBufferRef sampleBuffer, VTDecodeFrameFlags decodeFlags, void *sourceFrameRefCon, VTDecodeInfoFlags *infoFlagsOut);
OSStatus VTDecompressionSessionFinishDelayedFrames(VTDecompressionSessionRef session);