mirror of
https://github.com/espressif/esp-idf.git
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89 lines
3.2 KiB
C
89 lines
3.2 KiB
C
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/*----------------------------------------------------------------------------/
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/ TJpgDec - Tiny JPEG Decompressor include file (C)ChaN, 2019
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/----------------------------------------------------------------------------*/
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#ifndef DEF_TJPGDEC
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#define DEF_TJPGDEC
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/*---------------------------------------------------------------------------*/
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/* System Configurations */
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#define JD_SZBUF 512 /* Size of stream input buffer */
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#define JD_FORMAT 0 /* Output pixel 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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#define JD_TBLCLIP 1 /* Use table for saturation (might be a bit faster but increases 1K bytes of code size) */
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/*---------------------------------------------------------------------------*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(_WIN32) /* Main development platform */
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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
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#include "stdint.h"
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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 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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/* Rectangular structure */
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typedef struct {
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uint16_t 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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uint16_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 dmsk; /* Current bit in the current read byte */
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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 */
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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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void* workbuf; /* Working buffer for IDCT and RGB output */
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uint8_t* mcubuf; /* Working buffer for the MCU */
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void* pool; /* Pointer to available memory pool */
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uint16_t sz_pool; /* Size of momory pool (bytes available) */
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uint16_t (*infunc)(JDEC*, uint8_t*, uint16_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*, uint16_t(*)(JDEC*,uint8_t*,uint16_t), void*, uint16_t, void*);
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JRESULT jd_decomp (JDEC*, uint16_t(*)(JDEC*,void*,JRECT*), uint8_t);
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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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