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TinyJpgDec.h@1:79e97662234d, 2015-11-14 (annotated)
- Committer:
- the_sz
- Date:
- Sat Nov 14 02:43:21 2015 +0000
- Revision:
- 1:79e97662234d
- Parent:
- 0:b6f284347a66
INT -> JPEG_INT
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
humlet | 0:b6f284347a66 | 1 | /*----------------------------------------------------------------------------/ |
humlet | 0:b6f284347a66 | 2 | / TJpgDec - Tiny JPEG Decompressor include file (C)ChaN, 2012 |
humlet | 0:b6f284347a66 | 3 | /----------------------------------------------------------------------------*/ |
humlet | 0:b6f284347a66 | 4 | #ifndef _TJPGDEC |
humlet | 0:b6f284347a66 | 5 | #define _TJPGDEC |
humlet | 0:b6f284347a66 | 6 | /*---------------------------------------------------------------------------*/ |
humlet | 0:b6f284347a66 | 7 | /* System Configurations */ |
humlet | 0:b6f284347a66 | 8 | |
humlet | 0:b6f284347a66 | 9 | #define JD_SZBUF 1024 /* Size of stream input buffer */ |
the_sz | 1:79e97662234d | 10 | #define JD_FORMAT 0 /* Output pixel format 0:RGB888 (3 BYTE/pix), 1:RGB565 (1 WORD/pix) */ |
humlet | 0:b6f284347a66 | 11 | #define JD_USE_SCALE 1 /* Use descaling feature for output */ |
humlet | 0:b6f284347a66 | 12 | #define JD_TBLCLIP 1 /* Use table for saturation (might be a bit faster but increases 1K bytes of code size) */ |
humlet | 0:b6f284347a66 | 13 | |
humlet | 0:b6f284347a66 | 14 | /*---------------------------------------------------------------------------*/ |
humlet | 0:b6f284347a66 | 15 | |
humlet | 0:b6f284347a66 | 16 | #ifdef __cplusplus |
humlet | 0:b6f284347a66 | 17 | extern "C" { |
humlet | 0:b6f284347a66 | 18 | #endif |
humlet | 0:b6f284347a66 | 19 | |
humlet | 0:b6f284347a66 | 20 | #include "integer.h" |
humlet | 0:b6f284347a66 | 21 | |
humlet | 0:b6f284347a66 | 22 | |
humlet | 0:b6f284347a66 | 23 | /* Error code */ |
humlet | 0:b6f284347a66 | 24 | typedef enum { |
humlet | 0:b6f284347a66 | 25 | JDR_OK = 0, /* 0: Succeeded */ |
humlet | 0:b6f284347a66 | 26 | JDR_INTR, /* 1: Interrupted by output function */ |
humlet | 0:b6f284347a66 | 27 | JDR_INP, /* 2: Device error or wrong termination of input stream */ |
humlet | 0:b6f284347a66 | 28 | JDR_MEM1, /* 3: Insufficient memory pool for the image */ |
humlet | 0:b6f284347a66 | 29 | JDR_MEM2, /* 4: Insufficient stream input buffer */ |
humlet | 0:b6f284347a66 | 30 | JDR_PAR, /* 5: Parameter error */ |
humlet | 0:b6f284347a66 | 31 | JDR_FMT1, /* 6: Data format error (may be damaged data) */ |
humlet | 0:b6f284347a66 | 32 | JDR_FMT2, /* 7: Right format but not supported */ |
humlet | 0:b6f284347a66 | 33 | JDR_FMT3 /* 8: Not supported JPEG standard */ |
humlet | 0:b6f284347a66 | 34 | } |
humlet | 0:b6f284347a66 | 35 | JRESULT; |
humlet | 0:b6f284347a66 | 36 | |
humlet | 0:b6f284347a66 | 37 | |
humlet | 0:b6f284347a66 | 38 | |
humlet | 0:b6f284347a66 | 39 | /* Rectangular structure */ |
humlet | 0:b6f284347a66 | 40 | typedef struct { |
humlet | 0:b6f284347a66 | 41 | WORD left, right, top, bottom; |
humlet | 0:b6f284347a66 | 42 | } JRECT; |
humlet | 0:b6f284347a66 | 43 | |
humlet | 0:b6f284347a66 | 44 | |
humlet | 0:b6f284347a66 | 45 | |
humlet | 0:b6f284347a66 | 46 | /* Decompressor object structure */ |
humlet | 0:b6f284347a66 | 47 | typedef struct JDEC JDEC; |
humlet | 0:b6f284347a66 | 48 | struct JDEC { |
the_sz | 1:79e97662234d | 49 | JPG_UINT dctr; /* Number of bytes available in the input buffer */ |
humlet | 0:b6f284347a66 | 50 | BYTE* dptr; /* Current data read ptr */ |
humlet | 0:b6f284347a66 | 51 | BYTE* inbuf; /* Bit stream input buffer */ |
humlet | 0:b6f284347a66 | 52 | BYTE dmsk; /* Current bit in the current read byte */ |
humlet | 0:b6f284347a66 | 53 | BYTE scale; /* Output scaling ratio */ |
humlet | 0:b6f284347a66 | 54 | BYTE msx, msy; /* MCU size in unit of block (width, height) */ |
humlet | 0:b6f284347a66 | 55 | BYTE qtid[3]; /* Quantization table ID of each component */ |
humlet | 0:b6f284347a66 | 56 | SHORT dcv[3]; /* Previous DC element of each component */ |
humlet | 0:b6f284347a66 | 57 | WORD nrst; /* Restart inverval */ |
the_sz | 1:79e97662234d | 58 | JPG_UINT width, height; /* Size of the input image (pixel) */ |
humlet | 0:b6f284347a66 | 59 | BYTE* huffbits[2][2]; /* Huffman bit distribution tables [id][dcac] */ |
humlet | 0:b6f284347a66 | 60 | WORD* huffcode[2][2]; /* Huffman code word tables [id][dcac] */ |
humlet | 0:b6f284347a66 | 61 | BYTE* huffdata[2][2]; /* Huffman decoded data tables [id][dcac] */ |
humlet | 0:b6f284347a66 | 62 | LONG* qttbl[4]; /* Dequaitizer tables [id] */ |
humlet | 0:b6f284347a66 | 63 | void* workbuf; /* Working buffer for IDCT and RGB output */ |
humlet | 0:b6f284347a66 | 64 | BYTE* mcubuf; /* Working buffer for the MCU */ |
humlet | 0:b6f284347a66 | 65 | void* pool; /* Pointer to available memory pool */ |
the_sz | 1:79e97662234d | 66 | JPG_UINT sz_pool; /* Size of momory pool (bytes available) */ |
the_sz | 1:79e97662234d | 67 | JPG_UINT (*infunc)(JDEC*, BYTE*, JPG_UINT);/* Pointer to jpeg stream input function */ |
humlet | 0:b6f284347a66 | 68 | void* device; /* Pointer to I/O device identifiler for the session */ |
humlet | 0:b6f284347a66 | 69 | }; |
humlet | 0:b6f284347a66 | 70 | |
humlet | 0:b6f284347a66 | 71 | |
humlet | 0:b6f284347a66 | 72 | |
humlet | 0:b6f284347a66 | 73 | /* TJpgDec API functions */ |
the_sz | 1:79e97662234d | 74 | JRESULT jd_prepare (JDEC*, JPG_UINT(*)(JDEC*,BYTE*,JPG_UINT), void*, JPG_UINT, void*); |
the_sz | 1:79e97662234d | 75 | JRESULT jd_decomp (JDEC*, JPG_UINT(*)(JDEC*,void*,JRECT*), BYTE); |
humlet | 0:b6f284347a66 | 76 | |
humlet | 0:b6f284347a66 | 77 | |
humlet | 0:b6f284347a66 | 78 | #ifdef __cplusplus |
humlet | 0:b6f284347a66 | 79 | } |
humlet | 0:b6f284347a66 | 80 | #endif |
humlet | 0:b6f284347a66 | 81 | |
humlet | 0:b6f284347a66 | 82 | #endif /* _TJPGDEC */ |