103 lines
3.8 KiB
C
103 lines
3.8 KiB
C
/*----------------------------------------------------------------------------/
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/ TJpgDec - Tiny JPEG Decompressor R0.03 include file (C)ChaN, 2021
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/----------------------------------------------------------------------------*/
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#ifndef DEF_TJPGDEC
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#define DEF_TJPGDEC
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "tjpgdcnf.h"
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#include <string.h>
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#if defined(_WIN32) /* VC++ or some compiler without stdint.h */
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typedef unsigned char uint8_t;
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typedef unsigned short uint16_t;
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typedef short int16_t;
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typedef unsigned long uint32_t;
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typedef long int32_t;
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#else /* Embedded platform */
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#include <stdint.h>
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#endif
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#if JD_FASTDECODE >= 1
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typedef int16_t jd_yuv_t;
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#else
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typedef uint8_t jd_yuv_t;
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#endif
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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 broken 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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/* Rectangular region in the output image */
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typedef struct {
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uint16_t left; /* Left end */
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uint16_t right; /* Right end */
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uint16_t top; /* Top end */
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uint16_t bottom; /* Bottom end */
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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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size_t dctr; /* Number of bytes available in the input buffer */
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uint8_t *dptr; /* Current data read ptr */
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uint8_t *inbuf; /* Bit stream input buffer */
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uint8_t dbit; /* Number of bits availavble in wreg or reading bit mask */
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uint8_t scale; /* Output scaling ratio */
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uint8_t msx, msy; /* MCU size in unit of block (width, height) */
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uint8_t qtid[3]; /* Quantization table ID of each component, Y, Cb, Cr */
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uint8_t ncomp; /* Number of color components 1:grayscale, 3:color */
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int16_t dcv[3]; /* Previous DC element of each component */
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uint16_t nrst; /* Restart inverval */
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uint16_t width, height; /* Size of the input image (pixel) */
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uint8_t *huffbits[2][2]; /* Huffman bit distribution tables [id][dcac] */
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uint16_t *huffcode[2][2]; /* Huffman code word tables [id][dcac] */
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uint8_t *huffdata[2][2]; /* Huffman decoded data tables [id][dcac] */
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int32_t *qttbl[4]; /* Dequantizer tables [id] */
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#if JD_FASTDECODE >= 1
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uint32_t wreg; /* Working shift register */
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uint8_t marker; /* Detected marker (0:None) */
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#if JD_FASTDECODE == 2
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uint8_t longofs[2][2]; /* Table offset of long code [id][dcac] */
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uint16_t *hufflut_ac[2]; /* Fast huffman decode tables for AC short code [id] */
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uint8_t *hufflut_dc[2]; /* Fast huffman decode tables for DC short code [id] */
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#endif
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#endif
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void *workbuf; /* Working buffer for IDCT and RGB output */
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jd_yuv_t *mcubuf; /* Working buffer for the MCU */
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void *pool; /* Pointer to available memory pool */
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size_t sz_pool; /* Size of momory pool (bytes available) */
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size_t (*infunc)(JDEC *, uint8_t *, size_t); /* Pointer to jpeg stream input function */
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void *device; /* Pointer to I/O device identifiler for the session */
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};
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/* TJpgDec API functions */
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JRESULT jd_prepare (JDEC *jd, size_t (*infunc)(JDEC *, uint8_t *, size_t), void *pool, size_t sz_pool, void *dev);
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JRESULT jd_decomp (JDEC *jd, int (*outfunc)(JDEC *, void *, JRECT *), uint8_t scale);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _TJPGDEC */
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