示例#1
0
        //Define Quantization Table
        private static void DQT(Bitstream bs)
        {
            ushort marker = 0xFFDB;
            ushort length = 2 + 2 + 64;
            byte   QTY    = 0;                     // Bit 0-3: Number of QTable. Bit 4-7 precission. -> Table for Y with precision of 8 bit
            byte   QTCbCr = 1;                     // 1 (quantization table for CB,CR)

            byte[] outputYTable    = new byte[64]; // 64*(precision+1)
            byte[] outputCrCbTable = new byte[64];

            for (int i = 0; i < 64; i++)
            {
                //position at position i from zigzag = temp
                outputYTable[ZigZagTable[i]] = QTYStandard[i];
            }

            for (int i = 0; i < 64; i++)
            {
                outputCrCbTable[ZigZagTable[i]] = QTCrCbStandard[i];
            }

            bs.AddShort(marker);
            bs.AddShort(length);
            bs.AddByteSpecial(QTY);
            bs.WriteByteArray(bs, outputYTable, 0);
            bs.AddByteSpecial(QTCbCr);
            bs.WriteByteArray(bs, outputCrCbTable, 0);
        }
示例#2
0
        private static void APP0Head(Bitstream bs)
        {
            ushort length = 16;                  // length of segment >=16
            byte   j      = 0x4a;                // string J
            byte   f      = 0x46;                // string f
            byte   i      = 0x49;                // string I
            byte   zero   = 0x00;                // string #0
            byte   majorRevisionNumber = 1;
            byte   minorRevisionNumber = 1;      // together 1.1
            byte   xyunits             = 0;      // no unit = normal aspect ratio
            ushort xPixelDensity       = 0x0048; // x density
            ushort yPixelDensity       = 0x0048; // y density
            byte   thumbnailWidth      = 0;
            byte   thumbnailHeight     = 0;      // no thumbnail

            bs.AddShort(0xFFE0);                 //marker
            bs.AddShort(length);                 //length
            bs.AddByteSpecial(j);
            bs.AddByteSpecial(f);
            bs.AddByteSpecial(i);
            bs.AddByteSpecial(f);
            bs.AddByteSpecial(zero);
            bs.AddByteSpecial(majorRevisionNumber);
            bs.AddByteSpecial(minorRevisionNumber);
            bs.AddByteSpecial(xyunits);
            bs.AddShort(xPixelDensity);
            bs.AddShort(yPixelDensity);
            bs.AddByteSpecial(thumbnailWidth);
            bs.AddByteSpecial(thumbnailHeight);
        }
示例#3
0
        private static void SOS(Bitstream bs)
        {
            ushort marker         = 0xFFDA;
            ushort length         = 12;   // 6 + 2 * (number of components)
            byte   NROFComponents = 3;    // Number of Components in Picture 1 or 3
            byte   IdY            = 1;    // component ID
            byte   HTY            = 0x11; // Bits 0-3: AC Table
            byte   IdCb           = 2;
            //TODO: überprüfe ob richtig eingesetztes HT
            byte HTCb = 0x11; // Bits 4-7: DC Table
            byte IdCr = 3;
            byte HTCr = 0x11; // 0x11 would be AC and DC
            byte SS   = 0;    // start of spectral or prediction selection
            byte SE   = 63;   // end of spectral selection
            byte BF   = 0;    // successiv approcimation

            bs.AddShort(marker);
            bs.AddShort(length);
            bs.AddByteSpecial(NROFComponents);
            bs.AddByteSpecial(IdY);
            bs.AddByteSpecial(HTY);
            bs.AddByteSpecial(IdCb);
            bs.AddByteSpecial(HTCb);
            bs.AddByteSpecial(IdCr);
            bs.AddByteSpecial(HTCr);
            bs.AddByteSpecial(SS);
            bs.AddByteSpecial(SE);
            bs.AddByteSpecial(BF);
        }
示例#4
0
        private static void APP0Head(Bitstream bs)
        {
            ushort length = 16; // length of segment >=16
            byte j = 0x4a; // string J
            byte f = 0x46; // string f
            byte i = 0x49; // string I
            byte zero = 0x00; // string #0
            byte majorRevisionNumber = 1;
            byte minorRevisionNumber = 1; // together 1.1
            byte xyunits = 0; // no unit = normal aspect ratio
            ushort xPixelDensity = 0x0048; // x density
            ushort yPixelDensity = 0x0048; // y density
            byte thumbnailWidth = 0;
            byte thumbnailHeight = 0; // no thumbnail

            bs.AddShort(0xFFE0); //marker
            bs.AddShort(length); //length
            bs.AddByteSpecial(j);
            bs.AddByteSpecial(f);
            bs.AddByteSpecial(i);
            bs.AddByteSpecial(f);
            bs.AddByteSpecial(zero);
            bs.AddByteSpecial(majorRevisionNumber);
            bs.AddByteSpecial(minorRevisionNumber);
            bs.AddByteSpecial(xyunits);
            bs.AddShort(xPixelDensity);
            bs.AddShort(yPixelDensity);
            bs.AddByteSpecial(thumbnailWidth);
            bs.AddByteSpecial(thumbnailHeight);
        }
示例#5
0
        private static void DHTHead(Bitstream bs)
        {
            //Huffman-Code with only 1 Bits is not allowed
            //Maximum Huffman depth is 16
            ushort length;
            byte   hTInformation = 0x00; // bit 0..3 = number of HT

            //bit 4 = type of HT, 0 = DC, 1 = AC
            //bit 5..7 = must be 0

            // How many codes with symbol 1
            byte[] symbolLength = new byte[16]; // quantity of symbols with codeLength between 1..16 (Sum of symbols must be <= 256)
            byte[] table;                       // n bytes, n = total number of symbols

            //HuffmanEncoder he = new HuffmanEncoder();

            length = (ushort)(2 + 1 + 16 + HuffmanEncoder.huffmanTable.Count); // length = addition of bytes of each segment
            table  = new byte[HuffmanEncoder.huffmanTable.Count];

            //counts for each Values (List<bool>) the number of objects in it and saves it to symbolLength

            for (int k = 0; k < HuffmanEncoder.huffmanTable.Count; k++)
            {
                int temp = 0;
                foreach (List <bool> sl in HuffmanEncoder.huffmanTable.Values)
                {
                    if (k == sl.Count)
                    {
                        temp++;
                    }
                }
                symbolLength[k] = (byte)temp;
            }

            int j = 0;

            foreach (var symbolCount in HuffmanEncoder.huffmanTable.Keys)
            {
                table[j++] = symbolCount;
            }

            bs.AddShort(0xFFc4); //marker
            bs.AddShort(length);
            bs.AddByteSpecial(hTInformation);
            bs.WriteByteArray(bs, symbolLength, 0);
            bs.WriteByteArray(bs, table, 0);
        }
示例#6
0
        private static void DHTHead(Bitstream bs)
        {
            //Huffman-Code with only 1 Bits is not allowed
            //Maximum Huffman depth is 16
            ushort length;
            byte hTInformation = 0x00; // bit 0..3 = number of HT
            //bit 4 = type of HT, 0 = DC, 1 = AC
            //bit 5..7 = must be 0

            // How many codes with symbol 1
            byte[] symbolLength = new byte[16]; // quantity of symbols with codeLength between 1..16 (Sum of symbols must be <= 256)
            byte[] table; // n bytes, n = total number of symbols

            //HuffmanEncoder he = new HuffmanEncoder();

            length = (ushort)(2 + 1 + 16 + HuffmanEncoder.huffmanTable.Count); // length = addition of bytes of each segment
            table = new byte[HuffmanEncoder.huffmanTable.Count];

            //counts for each Values (List<bool>) the number of objects in it and saves it to symbolLength

            for (int k = 0; k < HuffmanEncoder.huffmanTable.Count; k++)
            {
                int temp = 0;
                foreach (List<bool> sl in HuffmanEncoder.huffmanTable.Values)
                {
                    if (k == sl.Count)
                        temp++;
                }
                symbolLength[k] = (byte)temp;
            }

            int j = 0;
            foreach (var symbolCount in HuffmanEncoder.huffmanTable.Keys)
            {
                table[j++] = symbolCount;
            }

            bs.AddShort(0xFFc4); //marker
            bs.AddShort(length);
            bs.AddByteSpecial(hTInformation);
            bs.WriteByteArray(bs, symbolLength, 0);
            bs.WriteByteArray(bs, table, 0);
        }
示例#7
0
        private static void SOS(Bitstream bs)
        {
            ushort marker = 0xFFDA;
            ushort length = 12; // 6 + 2 * (number of components)
            byte NROFComponents = 3; // Number of Components in Picture 1 or 3
            byte IdY = 1; // component ID
            byte HTY = 0x11; // Bits 0-3: AC Table
            byte IdCb = 2;
            //TODO: überprüfe ob richtig eingesetztes HT
            byte HTCb = 0x11; // Bits 4-7: DC Table
            byte IdCr = 3;
            byte HTCr = 0x11; // 0x11 would be AC and DC
            byte SS = 0; // start of spectral or prediction selection
            byte SE = 63; // end of spectral selection
            byte BF = 0; // successiv approcimation

            bs.AddShort(marker);
            bs.AddShort(length);
            bs.AddByteSpecial(NROFComponents);
            bs.AddByteSpecial(IdY);
            bs.AddByteSpecial(HTY);
            bs.AddByteSpecial(IdCb);
            bs.AddByteSpecial(HTCb);
            bs.AddByteSpecial(IdCr);
            bs.AddByteSpecial(HTCr);
            bs.AddByteSpecial(SS);
            bs.AddByteSpecial(SE);
            bs.AddByteSpecial(BF);
        }
示例#8
0
        private static void SOF0Head(Bitstream bs, ushort pHeight, ushort pWidth)
        {
            ushort length = 17; // 8 + (Y,Cb,Cr) * 3
            byte precision = 8; // precision of data in bits/sample
            ushort pictureHeight = pHeight;
            ushort pictureWidth = pWidth;
            byte components = 3; // 3 for Y,Cb,Cr
            byte IDY = 1; // ID component 1 = Y
            byte SFY = 0x22; // sampling factor for Y (bit 0-3 vertical, bit 4-7 horicontal)
            byte QTY = 0; // quantization table of Y = 0
            byte IDCb = 2; // ID component 2 = Cb
            byte SFCb = 0x11;
            byte QTCb = 0; // quantization table of Cb = 1
            byte IDCr = 3; // ID component 3 = Cr
            byte SFCr = 0x11;
            byte QTCr = 0;

            bs.AddShort(0xFFC0); // marker
            bs.AddShort(length);
            bs.AddByteSpecial(precision);
            bs.AddShort(pictureHeight);
            bs.AddShort(pictureWidth);
            bs.AddByteSpecial(components);
            bs.AddByteSpecial(IDY); // 3 Bytes for each component
            bs.AddByteSpecial(SFY);
            bs.AddByteSpecial(QTY);
            bs.AddByteSpecial(IDCb);
            bs.AddByteSpecial(SFCb);
            bs.AddByteSpecial(QTCb);
            bs.AddByteSpecial(IDCr);
            bs.AddByteSpecial(SFCr);
            bs.AddByteSpecial(QTCr);
        }
示例#9
0
        //Define Quantization Table
        private static void DQT(Bitstream bs)
        {
            ushort marker = 0xFFDB;
            ushort length = 2+2+64;
            byte QTY = 0; // Bit 0-3: Number of QTable. Bit 4-7 precission. -> Table for Y with precision of 8 bit
            byte QTCbCr = 1; // 1 (quantization table for CB,CR)

            byte[] outputYTable = new byte[64]; // 64*(precision+1)
            byte[] outputCrCbTable = new byte[64];

            for (int i = 0; i < 64; i++)
            {
                //position at position i from zigzag = temp
                outputYTable[ZigZagTable[i]] = QTYStandard[i];
            }

            for (int i = 0; i < 64; i++)
            {
                outputCrCbTable[ZigZagTable[i]] = QTCrCbStandard[i];
            }

            bs.AddShort(marker);
            bs.AddShort(length);
            bs.AddByteSpecial(QTY);
            bs.WriteByteArray(bs, outputYTable, 0);
            bs.AddByteSpecial(QTCbCr);
            bs.WriteByteArray(bs, outputCrCbTable, 0);
        }
示例#10
0
        private static void DHTHeadStandard(Bitstream bs)
        {
            // standards for 2:1 horicontal subsampling
            ushort length = 0x01A2;//DHTheadlänge
            byte AC = 0x10;//Durchschnittsfrequenz
            byte DC = 0x00;//min->max Frequenz

            byte[] YDCNodes = { 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
            byte[] YDCValues = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

            byte[] YACNodes = { 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
            byte[] YACValues = {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 };

            byte[] CbDCNodes = { 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
            byte[] CbDCValues = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

            byte[] CbACNodes = { 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
            byte[] CbACValues = {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 };

            bs.AddShort(0xFFc4); //marker
            bs.AddShort(length);

            bs.AddByteSpecial(DC); //HTInformation for YDC
            bs.WriteByteArray(bs, YDCNodes, 1); // 1 is startposition after the byte of HTInformation for YDC
            bs.WriteByteArray(bs, YDCValues, 0);

            bs.AddByteSpecial(AC);
            bs.WriteByteArray(bs, YACNodes, 1);
            bs.WriteByteArray(bs, YACValues, 0);

            bs.AddByteSpecial(DC);
            bs.WriteByteArray(bs, CbDCNodes, 1);
            bs.WriteByteArray(bs, CbDCValues, 0);

            bs.AddByteSpecial(AC);
            bs.WriteByteArray(bs, CbACNodes, 1);
            bs.WriteByteArray(bs, CbACValues, 0);
        }
示例#11
0
        private static void DHTHeadStandard(Bitstream bs)
        {
            // standards for 2:1 horicontal subsampling
            ushort length = 0x01A2; //DHTheadlänge
            byte   AC     = 0x10;   //Durchschnittsfrequenz
            byte   DC     = 0x00;   //min->max Frequenz

            byte[] YDCNodes  = { 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
            byte[] YDCValues = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

            byte[] YACNodes  = { 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
            byte[] YACValues = { 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 };

            byte[] CbDCNodes  = { 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
            byte[] CbDCValues = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

            byte[] CbACNodes  = { 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
            byte[] CbACValues = { 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 };


            bs.AddShort(0xFFc4); //marker
            bs.AddShort(length);

            bs.AddByteSpecial(DC);              //HTInformation for YDC
            bs.WriteByteArray(bs, YDCNodes, 1); // 1 is startposition after the byte of HTInformation for YDC
            bs.WriteByteArray(bs, YDCValues, 0);

            bs.AddByteSpecial(AC);
            bs.WriteByteArray(bs, YACNodes, 1);
            bs.WriteByteArray(bs, YACValues, 0);

            bs.AddByteSpecial(DC);
            bs.WriteByteArray(bs, CbDCNodes, 1);
            bs.WriteByteArray(bs, CbDCValues, 0);

            bs.AddByteSpecial(AC);
            bs.WriteByteArray(bs, CbACNodes, 1);
            bs.WriteByteArray(bs, CbACValues, 0);
        }
示例#12
0
        private static void SOF0Head(Bitstream bs, ushort pHeight, ushort pWidth)
        {
            ushort length        = 17; // 8 + (Y,Cb,Cr) * 3
            byte   precision     = 8;  // precision of data in bits/sample
            ushort pictureHeight = pHeight;
            ushort pictureWidth  = pWidth;
            byte   components    = 3;    // 3 for Y,Cb,Cr
            byte   IDY           = 1;    // ID component 1 = Y
            byte   SFY           = 0x22; // sampling factor for Y (bit 0-3 vertical, bit 4-7 horicontal)
            byte   QTY           = 0;    // quantization table of Y = 0
            byte   IDCb          = 2;    // ID component 2 = Cb
            byte   SFCb          = 0x11;
            byte   QTCb          = 0;    // quantization table of Cb = 1
            byte   IDCr          = 3;    // ID component 3 = Cr
            byte   SFCr          = 0x11;
            byte   QTCr          = 0;

            bs.AddShort(0xFFC0); // marker
            bs.AddShort(length);
            bs.AddByteSpecial(precision);
            bs.AddShort(pictureHeight);
            bs.AddShort(pictureWidth);
            bs.AddByteSpecial(components);
            bs.AddByteSpecial(IDY); // 3 Bytes for each component
            bs.AddByteSpecial(SFY);
            bs.AddByteSpecial(QTY);
            bs.AddByteSpecial(IDCb);
            bs.AddByteSpecial(SFCb);
            bs.AddByteSpecial(QTCb);
            bs.AddByteSpecial(IDCr);
            bs.AddByteSpecial(SFCr);
            bs.AddByteSpecial(QTCr);
        }