jtypes.h

一个自己编的将bmp压缩成jpeg格式图片并由串口与MD卡存取的程序。

static struct APP0infotype {
		U16 marker;// = 0xFFE0
		U16 length; // = 16 for usual JPEG, no thumbnail
		U8 JFIFsignature[5]; // = "JFIF",'\0'
		U8 versionhi; // 1
		U8 versionlo; // 1
		U8 xyunits;   // 0 = no units, normal density
		U16 xdensity;  // 1
		U16 ydensity;  // 1
		U8 thumbnwidth; // 0
		U8 thumbnheight; // 0
} APP0info={0xFFE0,16,'J','F','I','F',0,1,1,0,1,1,0,0};

static struct  SOF0infotype {
		U16 marker; // = 0xFFC0
		U16 length; // = 17 for a truecolor YCbCr JPG
		U8 precision ;// Should be 8: 8 bits/sample
		U16 height ;
		U16 width;
		U8 nrofcomponents;//Should be 3: We encode a truecolor JPG
		U8 IdY;  // = 1
		U8 HVY; // sampling factors for Y (bit 0-3 vert., 4-7 hor.)
		U8 QTY;  // Quantization Table number for Y = 0
		U8 IdCb; // = 2
		U8 HVCb;
		U8 QTCb; // 1
		U8 IdCr; // = 3
		U8 HVCr;
		U8 QTCr; // Normally equal to QTCb = 1
} SOF0info = { 0xFFC0,17,8,0,0,3,1,0x21,0,2,0x11,1,3,0x11,1};
// Default sampling factors are 1,1 for every image component: No downsampling

static struct DQTinfotype {
		 U16 marker;  // = 0xFFDB
		 U16 length;  // = 132
		 U8 QTYinfo;// = 0:  bit 0..3: number of QT = 0 (table for Y)
				  //       bit 4..7: precision of QT, 0 = 8 bit
		 U8 Ytable[64];
		 U8 QTCbinfo; // = 1 (quantization table for Cb,Cr}
		 U8 Cbtable[64];
		   } DQTinfo={0xFFDB,132,0,{
		   16,  11,  10,  16,  24,  40,  51,  61,
	12,  12,  14,  19,  26,  58,  60,  55,
	14,  13,  16,  24,  40,  57,  69,  56,
	14,  17,  22,  29,  51,  87,  80,  62,
	18,  22,  37,  56,  68, 109, 103,  77,
	24,  35,  55,  64,  81, 104, 113,  92,
	49,  64,  78,  87, 103, 121, 120, 101,
	72,  92,  95,  98, 112, 100, 103,  99}
	,1,{17,  18,  24,  47,  99,  99,  99,  99,
	18,  21,  26,  66,  99,  99,  99,  99,
	24,  26,  56,  99,  99,  99,  99,  99,
	47,  66,  99,  99,  99,  99,  99,  99,
	99,  99,  99,  99,  99,  99,  99,  99,
	99,  99,  99,  99,  99,  99,  99,  99,
	99,  99,  99,  99,  99,  99,  99,  99,
	99,  99,  99,  99,  99,  99,  99,  99}};
// Ytable from DQTinfo should be equal to a scaled and zizag reordered version
// of the table which can be found in "tables.h": std_luminance_qt
// Cbtable , similar = std_chrominance_qt
// We'll init them in the program using set_DQTinfo function

static struct DHTinfotype {
		 U16 marker;  // = 0xFFC4
		 U16 length;  //0x01A2
		 U8 HTYDCinfo; // bit 0..3: number of HT (0..3), for Y =0
			  //bit 4  :type of HT, 0 = DC table,1 = AC table
				//bit 5..7: not used, must be 0
		 U8 YDC_nrcodes[16]; //at index i = nr of codes with length i
		 U8 YDC_values[12];
		 U8 HTYACinfo; // = 0x10
		 U8 YAC_nrcodes[16];
		 U8 YAC_values[162];//we'll use the standard Huffman tables
		 U8 HTCbDCinfo; // = 1
		 U8 CbDC_nrcodes[16];
		 U8 CbDC_values[12];
		 U8 HTCbACinfo; //  = 0x11
		 U8 CbAC_nrcodes[16];
		 U8 CbAC_values[162];
} DHTinfo={
0xFFC4,0x01A2,0,{0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0},
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11},0x10,
{0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d},
{0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
	  0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
	  0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
	  0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
	  0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
	  0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
	  0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
	  0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
	  0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
	  0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
	  0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
	  0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
	  0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
	  0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
	  0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
	  0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
	  0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
	  0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
	  0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
	  0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
	  0xf9, 0xfa},0x01,
{0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0},
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11},0x11,
{0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77},
{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
	  0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
	  0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
	  0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
	  0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
	  0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
	  0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
	  0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
	  0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
	  0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
	  0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
	  0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
	  0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
	  0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
	  0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
	  0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
	  0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
	  0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
	  0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
	  0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
	  0xf9, 0xfa }

};

static struct SOSinfotype {
		 U16 marker;  // = 0xFFDA
		 U16 length; // = 12
		 U8 nrofcomponents; // Should be 3: truecolor JPG
		 U8 IdY; //1
		 U8 HTY; //0 // bits 0..3: AC table (0..3)
				   // bits 4..7: DC table (0..3)
		 U8 IdCb; //2
		 U8 HTCb; //0x11
		 U8 IdCr; //3
		 U8 HTCr; //0x11
		 U8 Ss,Se,Bf; // not interesting, they should be 0,63,0
} SOSinfo={0xFFDA,12,3,1,0,2,0x11,3,0x11,0,0x3F,0};

typedef struct { U8 B,G,R; } colorRGB;
typedef struct { U8 length;
		 U16 value;} bitstring;
 
//#define  Y(R,G,B) ((U8)( (YRtab[(R)]+YGtab[(G)]+YBtab[(B)])>>16 ) - 128)
//#define Cb(R,G,B) ((U8)( (CbRtab[(R)]+CbGtab[(G)]+CbBtab[(B)])>>16 ) )
//#define Cr(R,G,B) ((U8)( (CrRtab[(R)]+CrGtab[(G)]+CrBtab[(B)])>>16 ) )
/*static int number;
#define writebyte(b) jpeg1.b1data[number]=b;number=number+1;
#define writeword(w) writebyte((w)/256);writebyte((w)%256);
*/