2013-01-08 22:40:58 +08:00
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/*----------------------------------------------------------------------------/
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/ TJpgDec - Tiny JPEG Decompressor include file (C)ChaN, 2011
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/----------------------------------------------------------------------------*/
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/* System Configurations */
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#define JD_SZBUF 512 /* Size of stream input buffer (should be multiple of 512) */
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#define JD_FORMAT 1 /* Output RGB format 0:RGB888 (3 BYTE/pix), 1:RGB565 (1 WORD/pix) */
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#define JD_USE_SCALE 1 /* Use descaling feature for output */
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/*---------------------------------------------------------------------------*/
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#include "integer.h"
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/* Error code */
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typedef enum {
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JDR_OK = 0, /* 0: Succeeded */
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JDR_INTR, /* 1: Interrupted by output function */
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JDR_INP, /* 2: Device error or wrong termination of input stream */
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JDR_MEM1, /* 3: Insufficient memory pool for the image */
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JDR_MEM2, /* 4: Insufficient stream input buffer */
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JDR_PAR, /* 5: Parameter error */
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JDR_FMT1, /* 6: Data format error (may be damaged data) */
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JDR_FMT2, /* 7: Right format but not supported */
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JDR_FMT3 /* 8: Not supported JPEG standard */
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} JRESULT;
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typedef struct {
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WORD left, right, top, bottom;
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} JRECT;
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/* Decompressor object structure */
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typedef struct JDEC JDEC;
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struct JDEC {
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UINT dctr; /* Number of bytes available in the input buffer */
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BYTE* dptr; /* Current data read ptr */
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BYTE* inbuf; /* Bit stream input buffer */
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BYTE dmsk; /* Current bit in the current read byte */
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BYTE scale; /* Output scaling ratio */
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BYTE msx, msy; /* MCU size in unit of block (width, height) */
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BYTE qtid[3]; /* Quantization table ID of each component */
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SHORT dcv[3]; /* Previous DC element of each component */
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WORD nrst; /* Restart inverval */
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UINT width, height; /* Size of the input image (pixel) */
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BYTE* huffbits[2][2]; /* Huffman bit distribution tables [id][dcac] */
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WORD* huffcode[2][2]; /* Huffman code word tables [id][dcac] */
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BYTE* huffdata[2][2]; /* Huffman decoded data tables [id][dcac] */
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LONG* qttbl[4]; /* Dequaitizer tables [id] */
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void* workbuf; /* Working buffer for IDCT and RGB output */
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BYTE* mcubuf; /* Working buffer for the MCU */
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void* pool; /* Pointer to available memory pool */
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UINT sz_pool; /* Size of momory pool (bytes available) */
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UINT (*infunc)(JDEC*, BYTE*, UINT);/* Pointer to jpeg stream input function */
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UINT (*outfunc)(JDEC*, void*, JRECT*); /* Pointer to RGB output function */
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void* device; /* Pointer to I/O device identifiler for the session */
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};
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#define LDB_WORD(ptr) (WORD)(((WORD)*((BYTE*)(ptr))<<8)|(WORD)*(BYTE*)((ptr)+1))
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/* TJpgDec API functions */
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JRESULT jd_prepare (JDEC*, UINT(*)(JDEC*,BYTE*,UINT), void*, UINT, void*);
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JRESULT jd_decomp (JDEC*, UINT(*)(JDEC*,void*,JRECT*), BYTE);
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