/*

File: NaiveDecoder.h, part of ExampleIPBCodec

Abstract: Core routines of a decoder for a simplistic video encoding format.

Version: 1.0

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*/

#ifndef NAIVEDECODER_H

#define NAIVEDECODER_H

#include <QuickTime/QuickTime.h>

#include "NaiveFormat.h"

// Read the 16-byte header at the start of the frame without advancing dataPtr.

extern OSStatus

NaiveDecoder_DecodeFrameHeader( 

        const UInt8 *dataPtr, 

        Boolean *keyFrameOut,

        Boolean *differenceFrameOut,

        Boolean *droppableFrameOut,

        int *storageIndexOut );

// Read the frame payload and decode a frame of the given dimensions into destBuffer.

// dataPtrInOut points to a variable that points to the incoming datastream; 

// it will be updated with the advanced datastream pointer after a successful decode.

// dataProc points to a data-loading callback record if the codec is being

// called with one; otherwise it is NULL.  

// dataSize is the total size of compressed data if available, 0 if not.

// (Note that some legacy APIs allow applications to request image decompression 

// without providing the data size; decompressors should handle this case robustly.)

// predictionBuffers is an array of planar YUV 4:2:0 buffers containing 

// previously-decoded frames that this frame may depend upon.

extern OSStatus

NaiveDecoder_DecodeFramePayload( 

        size_t width,

        size_t height,

        const UInt8 **dataPtrInOut, 

        ICMDataProcRecord *dataProc,

        size_t dataSize,

        struct InternalPixelBuffer predictionBuffers[kMaxStoredFrames],

        struct InternalPixelBuffer *destBuffer );

#endif // NAIVEDECODER_H