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45 #include "grfmt_base.h"
48 class RMJpegBitStream : public RMBitStream
51 RMByteStream m_low_strm;
56 virtual bool Open( const char* filename );
59 void Flush(); // flushes high-level bit stream
64 virtual void ReadBlock();
68 //////////////////// JPEG reader /////////////////////
70 class GrFmtJpegReader : public GrFmtReader
79 bool ReadData( uchar* data, int step, int color );
84 int m_offset; // offset of first scan
85 int m_version; // JFIF version
86 int m_planes; // 3 (YCrCb) or 1 (Gray)
87 int m_precision; // 8 or 12-bit per sample
88 int m_type; // SOF type
89 int m_MCUs; // MCUs in restart interval
90 int m_ss, m_se, m_ah, m_al; // progressive JPEG parameters
92 // information about each component
95 char h; // horizontal sampling factor
96 char v; // vertical sampling factor
97 char tq; // quantization table index
98 char td, ta; // DC & AC huffman tables
99 int dc_pred; // DC predictor
113 RMJpegBitStream m_strm;
117 bool load_quant_tables( int length );
118 bool load_huffman_tables( int length );
119 void ProcessScan( int* idx, int ns, uchar* data, int step, int color );
121 void GetBlock( int* block, int c );
124 #endif/*_RD_JPEG_H_*/