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quickwayne |
#include "ejpgl.h"
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unsigned char qtable[64] = {16, 8, 8, 16, 12, 8, 16, 16, 16, 16, 16, 16, 16, 16,
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16, 32, 32, 16, 16, 16, 16, 32, 32, 32, 32, 32, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 128, 64, 64, 128, 128, 128, 128, 128, 64, 64,
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128, 128, 128, 128, 128, 64, 128, 128, 128};
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unsigned char huffmancount[4][16] = {{0x00,0x01,0x05,0x01,0x01,0x01,0x01,0x01,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, //standard DC table count
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{0x00,0x02,0x01,0x03,0x03,0x02,0x04,0x03,0x05,0x05,0x04,0x04,0x00,0x00,0x01,0x7D}, //standard AC table count
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{0x00,0x01,0x05,0x01,0x01,0x01,0x01,0x01,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, //standard DC table count
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{0x00,0x02,0x01,0x03,0x03,0x02,0x04,0x03,0x05,0x05,0x04,0x04,0x00,0x00,0x01,0x7D}}; //standard AC table count
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unsigned char huffDCvalues[12] ={0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b};// {0x00, 0x02, 0x03, 0x04, 0x05, 0x06, 0x0E, 0x0E, 0x0E, 0x0E, 0x0E, 0x0E};
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unsigned char huffACvalues[162] = {0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71,
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0x14, 0x32, 0x81, 0x91, 0xA1, 0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0, 0x24, 0x33, 0x62, 0x72, 0x82,
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0x09, 0x0A, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64,
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0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
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0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9,
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0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9,
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0xEA, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA};
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int writejpegheader(INFOHEADER *header, JPEGHEADER *jpegheader)
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{
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unsigned int huffmantablesize, previoussize;
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unsigned char QTcount, i, j, components, id, huffmantablecount;
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unsigned short length, headerlength;
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//Number of Quatization Tables
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QTcount = 2;
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headerlength = 12; //12 bytes are needed for the markers
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huffmantablecount = 4; //2 AC and 2 DC tables
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huffmantablesize = 0;
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jpegheader->SOIMarker[0] = 0xff;
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jpegheader->SOIMarker[1] = 0xd8;
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//APP0 segment
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jpegheader->app0.APP0Marker[0] = 0xff;
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jpegheader->app0.APP0Marker[1] = 0xe0;
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headerlength += 16; //APP0 marker is always 16 bytes long
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jpegheader->app0.Length[0] = 0x00;
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jpegheader->app0.Length[1] = 0x10;
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jpegheader->app0.Identifier[0] = 0x4a;
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jpegheader->app0.Identifier[1] = 0x46;
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jpegheader->app0.Identifier[2] = 0x49;
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jpegheader->app0.Identifier[3] = 0x46;
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jpegheader->app0.Identifier[4] = 0x00;
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jpegheader->app0.Version[0] = 0x01;
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jpegheader->app0.Version[1] = 0x00;
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jpegheader->app0.Units = 0x00;
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jpegheader->app0.XDensity[0] = 0x00;
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jpegheader->app0.XDensity[1] = 0x01;
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jpegheader->app0.YDensity[0] = 0x00;
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jpegheader->app0.YDensity[1] = 0x01;
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jpegheader->app0.ThumbWidth = 0x00;
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jpegheader->app0.ThumbHeight = 0x00;
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//Quantization Table Segment
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jpegheader->qt.QTMarker[0] = 0xff;
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jpegheader->qt.QTMarker[1] = 0xdb;
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length = (QTcount<<6) + QTcount + 2;
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headerlength += length;
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jpegheader->qt.Length[0] = (length & 0xff00)>>8;
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jpegheader->qt.Length[1] = length & 0xff;
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// jpegheader->qt.QTInfo = 0x00; // index = 0, precision = 0
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//write Quantization table to header
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i = 0;
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for (id=0; id<QTcount; id++) {
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jpegheader->qt.QTInfo[(id<<6)+id] = id;
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for(i=0;i<64;i++) {
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jpegheader->qt.QTInfo[i+1+id+(id<<6)] = qtable[i];
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}
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}
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//Start of Frame segment
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jpegheader->sof0.SOF0Marker[0] = 0xff;
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jpegheader->sof0.SOF0Marker[1] = 0xc0;
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if(header->bits == 8) {
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components = 0x01;
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}
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else {
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components = 0x03;
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}
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length = 8 + 3*components;
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headerlength += length;
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jpegheader->sof0.Length[0] = (length & 0xff00) >> 8;
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jpegheader->sof0.Length[1] = length & 0xff;
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jpegheader->sof0.DataPrecision = 0x08;
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jpegheader->sof0.ImageHeight[0] = (header->height & 0xff00) >> 8;
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jpegheader->sof0.ImageHeight[1] = header->height & 0xff;
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jpegheader->sof0.ImageWidth[0] = (header->width & 0xff00) >> 8;
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jpegheader->sof0.ImageWidth[1] = header->width & 0xff;
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jpegheader->sof0.Components = components;
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for (i=0; i < components; i++) {
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jpegheader->sof0.ComponentInfo[i][0] = i+1; //color component
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if(i==0) {
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jpegheader->sof0.ComponentInfo[i][1] = 0x22; //4:2:0 subsampling
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} else {
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jpegheader->sof0.ComponentInfo[i][1] = 0x11; //4:2:0 subsampling
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}
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jpegheader->sof0.ComponentInfo[i][2] = (i==0)? 0x00 : 0x01; //quantization table ID
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}
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//Start of Huffman Table Segment
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jpegheader->ht.HTMarker[0] = 0xff;
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jpegheader->ht.HTMarker[1] = 0xc4;
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//Set dummy HT segment length
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length = 0;//tablecount*17;
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jpegheader->ht.Length[0] = (length & 0xff00) >> 8;
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jpegheader->ht.Length[1] = length & 0xff;
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previoussize = 0;
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for (id=0; id < huffmantablecount; id++) {
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huffmantablesize = 0;
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switch (id) {
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case 0 : jpegheader->ht.HuffmanInfo[previoussize] = 0x00;
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break;
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case 1 : jpegheader->ht.HuffmanInfo[previoussize] = 0x10;
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break;
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case 2 : jpegheader->ht.HuffmanInfo[previoussize] = 0x01;
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break;
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case 3 : jpegheader->ht.HuffmanInfo[previoussize] = 0x11;
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break;
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}
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for (i=1; i <= 16; i++) {
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jpegheader->ht.HuffmanInfo[i+previoussize] = huffmancount[id][i-1];
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huffmantablesize += huffmancount[id][i-1];
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}
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for (i=0; i < huffmantablesize; i++) {
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jpegheader->ht.HuffmanInfo[i+previoussize+17] = (id%2 == 1)? huffACvalues[i] : huffDCvalues[i];
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}
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previoussize += huffmantablesize + 17;
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}
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//Set real HT segment length
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length = 2+previoussize;
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headerlength += length;
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jpegheader->ht.Length[0] = (length & 0xff00) >> 8;
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jpegheader->ht.Length[1] = length & 0xff;
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//Reset marker segment
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//Start of Scan Header Segment
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jpegheader->sos.SOSMarker[0] = 0xff;
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jpegheader->sos.SOSMarker[1] = 0xda;
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length = 6 + (components<<1);
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headerlength += length;
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jpegheader->sos.Length[0] = (length & 0xff00) >> 8;
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jpegheader->sos.Length[1] = length & 0xff;
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jpegheader->sos.ComponentCount = components; //number of color components in the image
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jpegheader->sos.Component[0][0] = 0x01; //Y component
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jpegheader->sos.Component[0][1] = 0x00; //indexes of huffman tables for Y-component
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if (components == 0x03) {
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jpegheader->sos.Component[1][0] = 0x02; //the CB component
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jpegheader->sos.Component[1][1] = 0x11; //indexes of huffman tables for CB-component
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jpegheader->sos.Component[2][0] = 0x03; //The CR component
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jpegheader->sos.Component[2][1] = 0x11; //indexes of huffman tables for CR-component
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}
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//following bytes are ignored since progressive scan is not to be implemented
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jpegheader->sos.Ignore[0] = 0x00;
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jpegheader->sos.Ignore[1] = 0x3f;
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jpegheader->sos.Ignore[2] = 0x00;
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return headerlength;
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}
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