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00014 #ifndef __MXCPC_FRAMEWISEMXPEGDECODER_H__
00015 #define __MXCPC_FRAMEWISEMXPEGDECODER_H__
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00019 #include <mxcpcMxPEGDecoder.h>
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00021
00022
00023 class mxcpcFramewiseMxPEGScanDecoder;
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00049 class mxcpcFramewiseMxPEGDecoder : public mxcpcMxPEGDecoder {
00050
00051 public:
00052 class UndecodedFrameDescriptor {
00053
00054 public:
00055 int Width, Height;
00056 int TileNumX, TileNumY;
00057 unsigned char *ScanBytes;
00058 int ScanLength;
00059 unsigned char *TileBits;
00060
00061 public:
00062
00063 UndecodedFrameDescriptor() { reset(640, 480); }
00064
00065 void setResolution(int width, int height) {
00066
00067 if(width < 1) width = 640;
00068 if(height < 1) height = 480;
00069
00070 Width = width;
00071 Height = height;
00072
00073 TileNumX = width/16;
00074 if(width % 16) TileNumX++;
00075 TileNumY = height/16;
00076 if(height % 16) TileNumY++;
00077 }
00078
00079 void reset(int width, int height) {
00080
00081 setResolution(width, height);
00082
00083 ScanBytes = 0;
00084 ScanLength = 0;
00085
00086 TileBits = 0;
00087 }
00088 };
00089
00090 private:
00091 enum DecoderState { AwaitSOI,
00092 AwaitAPP0,
00093 APP0,
00094 Determine_FingerPrint_Or_FrameHeader,
00095 Determine_FingerPrint_Or_FrameHeader2,
00096 FingerPrint,
00097 AwaitFrameHeader,
00098 AwaitFrameHeader2,
00099 FrameHeader,
00100 BitMask_Or_Tables,
00101 QuantizationTable1,
00102 AwaitQuantizationTable2,
00103 QuantizationTable2,
00104 Huffman_Or_SOF,
00105 SOF,
00106 HuffmanTable,
00107 Huffman_Or_Scan,
00108 Scan,
00109 Scan2,
00110 BitMask,
00111 Tables_Or_Scan,
00112 Audio_Or_SOI,
00113 Audio,
00114 No_Good_State
00115 };
00116
00117 private:
00118
00119
00120 DecoderState State;
00121 unsigned char *CurrentBytePtr;
00122 int BytesLeft;
00123 int AwaitMarkerStage;
00124 int ReadMarkerStage;
00125 unsigned char ReadMarkerFirstLenByte;
00126 int MarkerBytesNeeded;
00127 int ScanStage;
00128 unsigned char *MarkerPayload;
00129
00130 UndecodedFrameDescriptor FrameDescriptor;
00131 int Width, Height;
00132 mxcpcFramewiseMxPEGScanDecoder *ScanDecoder;
00133
00134 unsigned char *PrefetchBuffer;
00135 int PrefetchBuffSize;
00136 int PrefetchedBytes;
00137
00138 public:
00140 mxcpcFramewiseMxPEGDecoder(mxcpcStreamSource *source,
00141 mxcpcMxPEGDecoderBackEnd *backend,
00142 mxcpcFramewiseMxPEGScanDecoder *scan_decoder);
00143 ~mxcpcFramewiseMxPEGDecoder();
00144
00145 public:
00147 int decode(int num);
00148
00149 private:
00152 void feedBytes(unsigned char *buffer, int num);
00154 bool awaitMarker(unsigned char *marker_type);
00156 bool readMarkerPayload(void);
00158 bool doScan(void);
00159 };
00160
00161
00162
00163 #endif // __MXCPC_FRAMEWISEMXPEGDECODER_H__
00164