ts

package
{
    import flash.display.BitmapData;
    import flash.utils.ByteArray;

    public final class JPEGEncoderTS
    {
        // Static table initialization
        private const ZigZag:Vector.<int> = Vector.<int>([
             0, 1, 5, 6,14,15,27,28,
             2, 4, 7,13,16,26,29,42,
             3, 8,12,17,25,30,41,43,
             9,11,18,24,31,40,44,53,
            10,19,23,32,39,45,52,54,
            20,22,33,38,46,51,55,60,
            21,34,37,47,50,56,59,61,
            35,36,48,49,57,58,62,63
        ]);
        private var YTable:Vector.<int> = new Vector.<int>(64, true);
        private var UVTable:Vector.<int> = new Vector.<int>(64, true);
        private var outputfDCTQuant:Vector.<int> = new Vector.<int>(64, true);
        private var fdtbl_Y:Vector.<Number> = new Vector.<Number>(64, true);
        private var fdtbl_UV:Vector.<Number> = new Vector.<Number>(64, true);
        private var sf:int;

        private const aasf:Vector.<Number> = Vector.<Number>([
                1.0, 1.387039845, 1.306562965, 1.175875602,
                1.0, 0.785694958, 0.541196100, 0.275899379
            ]);

        private var YQT:Vector.<int> = Vector.<int>([
                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
            ]);

        private const UVQT:Vector.<int> = Vector.<int>([
                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
            ]);

        private function initQuantTables(sf:int):void
        {
            var i:int;
            const I64:int = 64;
            const I8:int = 8;
            for (i = 0; i < I64; ++i)
            {
                var t:int = int((YQT[i]*sf+50)*0.01);
                if (t < 1) {
                    t = 1;
                } else if (t > 255) {
                    t = 255;
                }
                YTable[ZigZag[i]] = t;
            }

            for (i = 0; i < I64; i++)
            {
                var u:int = int((UVQT[i]*sf+50)*0.01);
                if (u < 1) {
                    u = 1;
                } else if (u > 255) {
                    u = 255;
                }
                UVTable[ZigZag[i]] = u;
            }
            i = 0;
            for (var row:int = 0; row < I8; ++row)
            {
                for (var col:int = 0; col < I8; ++col)
                {
                    fdtbl_Y[i]  = (1 / (YTable [ZigZag[i]] * aasf[row] * aasf[col] * I8));
                    fdtbl_UV[i] = (1 / (UVTable[ZigZag[i]] * aasf[row] * aasf[col] * I8));
                    i++;
                }
            }
        }

        private var YDC_HT:Vector.<BitString>;
        private var UVDC_HT:Vector.<BitString>;
        private var YAC_HT:Vector.<BitString>;
        private var UVAC_HT:Vector.<BitString>;

        private function computeHuffmanTbl(nrcodes:Vector.<int>, std_table:Vector.<int>):Vector.<BitString>
        {
            var codevalue:int = 0;
            var pos_in_table:int = 0;
            var HT:Vector.<BitString> = new Vector.<BitString>(251, true);
            var bitString:BitString;
            for (var k:int=1; k<=16; ++k)
            {
                for (var j:int=1; j<=nrcodes[k]; ++j)
                {
                    HT[std_table[pos_in_table]] = bitString = new BitString();
                    bitString.val = codevalue;
                    bitString.len = k;
                    pos_in_table++;
                    codevalue++;
                }
                codevalue<<=1;
            }
            return HT;
        }

        private var std_dc_luminance_nrcodes:Vector.<int> = Vector.<int>([0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0]);
        private var std_dc_luminance_values:Vector.<int> = Vector.<int>([0,1,2,3,4,5,6,7,8,9,10,11]);
        private var std_ac_luminance_nrcodes:Vector.<int> = Vector.<int>([0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d]);
        private var std_ac_luminance_values:Vector.<int> = Vector.<int>([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]);

        private var std_dc_chrominance_nrcodes:Vector.<int> = Vector.<int>([0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0]);
        private var std_dc_chrominance_values:Vector.<int> = Vector.<int>([0,1,2,3,4,5,6,7,8,9,10,11]);
        private var std_ac_chrominance_nrcodes:Vector.<int> = Vector.<int>([0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77]);
        private var std_ac_chrominance_values:Vector.<int> = Vector.<int>([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
                                                                            ]);

        private function initHuffmanTbl():void
        {
            YDC_HT = computeHuffmanTbl(std_dc_luminance_nrcodes,std_dc_luminance_values);
            UVDC_HT = computeHuffmanTbl(std_dc_chrominance_nrcodes,std_dc_chrominance_values);
            YAC_HT = computeHuffmanTbl(std_ac_luminance_nrcodes,std_ac_luminance_values);
            UVAC_HT = computeHuffmanTbl(std_ac_chrominance_nrcodes,std_ac_chrominance_values);
        }

        private var bitcode:Vector.<BitString> = new Vector.<BitString>(65535, true);
        private var category:Vector.<int> = new Vector.<int>(65535, true);

        private function initCategoryNumber():void
        {
            var nrlower:int = 1;
            var nrupper:int = 2;
            var bitString:BitString;
            const I15:int = 15;
            var pos:int;
            for (var cat:int=1; cat<=I15; ++cat)
            {
                //Positive numbers
                for (var nr:int=nrlower; nr<nrupper; ++nr)
                {
                    pos = int(32767+nr);
                    category[pos] = cat;
                    bitcode[pos] = bitString = new BitString();
                    bitString.len = cat;
                    bitString.val = nr;
                }
                //Negative numbers
                for (var nrneg:int=-(nrupper-1); nrneg<=-nrlower; ++nrneg)
                {
                    pos = int(32767+nrneg);
                    category[pos] = cat;
                    bitcode[pos] = bitString = new BitString();
                    bitString.len = cat;
                    bitString.val = nrupper-1+nrneg;
                }
                nrlower <<= 1;
                nrupper <<= 1;
            }
        }

        // IO functions

        private var byteout:ByteArray;
        private var bytenew:int = 0;
        private var bytepos:int = 7;

        private function writeBits(bs:BitString):void
        {
            var value:int = bs.val;
            var posval:int = bs.len-1;
            while ( posval >= 0 )
            {
                if (value & uint(1 << posval) )
                    bytenew |= uint(1 << bytepos);
                posval--;
                bytepos--;
                if (bytepos < 0)
                {
                    if (bytenew == 0xFF)
                    {
                        byteout.writeByte(0xFF);
                        byteout.writeByte(0);
                    }
                    else byteout.writeByte(bytenew);
                    bytepos=7;
                    bytenew=0;
                }
            }
        }

        // DCT & quantization core

        private function fDCTQuant(data:Vector.<Number>, fdtbl:Vector.<Number>):Vector.<int>
        {
            var d0:Number, d1:Number, d2:Number, d3:Number, d4:Number, d5:Number, d6:Number, d7:Number;
            /* Pass 1: process rows. */
            var dataOff:int=0;
            var i:int;
            const I8:int = 8;
            const I64:int = 64;
            for (i=0; i<I8; ++i)
            {
                d0 = data[int(dataOff)];
                d1 = data[int(dataOff+1)];
                d2 = data[int(dataOff+2)];
                d3 = data[int(dataOff+3)];
                d4 = data[int(dataOff+4)];
                d5 = data[int(dataOff+5)];
                d6 = data[int(dataOff+6)];
                d7 = data[int(dataOff+7)];

                var tmp0:Number = d0 + d7;
                var tmp7:Number = d0 - d7;
                var tmp1:Number = d1 + d6;
                var tmp6:Number = d1 - d6;
                var tmp2:Number = d2 + d5;
                var tmp5:Number = d2 - d5;
                var tmp3:Number = d3 + d4;
                var tmp4:Number = d3 - d4;

                /* Even part */
                var tmp10:Number = tmp0 + tmp3; /* phase 2 */
                var tmp13:Number = tmp0 - tmp3;
                var tmp11:Number = tmp1 + tmp2;
                var tmp12:Number = tmp1 - tmp2;

                data[int(dataOff)] = tmp10 + tmp11; /* phase 3 */
                data[int(dataOff+4)] = tmp10 - tmp11;

                var z1:Number = (tmp12 + tmp13) * 0.707106781; /* c4 */
                data[int(dataOff+2)] = tmp13 + z1; /* phase 5 */
                data[int(dataOff+6)] = tmp13 - z1;

                /* Odd part */
                tmp10 = tmp4 + tmp5; /* phase 2 */
                tmp11 = tmp5 + tmp6;
                tmp12 = tmp6 + tmp7;

                /* The rotator is modified from fig 4-8 to avoid extra negations. */
                var z5:Number = (tmp10 - tmp12) * 0.382683433; /* c6 */
                var z2:Number = 0.541196100 * tmp10 + z5; /* c2-c6 */
                var z4:Number = 1.306562965 * tmp12 + z5; /* c2+c6 */
                var z3:Number = tmp11 * 0.707106781; /* c4 */

                var z11:Number = tmp7 + z3; /* phase 5 */
                var z13:Number = tmp7 - z3;

                data[int(dataOff+5)] = z13 + z2;    /* phase 6 */
                data[int(dataOff+3)] = z13 - z2;
                data[int(dataOff+1)] = z11 + z4;
                data[int(dataOff+7)] = z11 - z4;

                dataOff += 8; /* advance pointer to next row */
            }

            /* Pass 2: process columns. */
            dataOff = 0;
            for (i=0; i<I8; ++i)
            {
                d0 = data[int(dataOff)];
                d1 = data[int(dataOff + 8)];
                d2 = data[int(dataOff + 16)];
                d3 = data[int(dataOff + 24)];
                d4 = data[int(dataOff + 32)];
                d5 = data[int(dataOff + 40)];
                d6 = data[int(dataOff + 48)];
                d7 = data[int(dataOff + 56)];

                var tmp0p2:Number = d0 + d7;
                var tmp7p2:Number = d0 - d7;
                var tmp1p2:Number = d1 + d6;
                var tmp6p2:Number = d1 - d6;
                var tmp2p2:Number = d2 + d5;
                var tmp5p2:Number = d2 - d5;
                var tmp3p2:Number = d3 + d4;
                var tmp4p2:Number = d3 - d4;

                /* Even part */
                var tmp10p2:Number = tmp0p2 + tmp3p2;   /* phase 2 */
                var tmp13p2:Number = tmp0p2 - tmp3p2;
                var tmp11p2:Number = tmp1p2 + tmp2p2;
                var tmp12p2:Number = tmp1p2 - tmp2p2;

                data[int(dataOff)] = tmp10p2 + tmp11p2; /* phase 3 */
                data[int(dataOff+32)] = tmp10p2 - tmp11p2;

                var z1p2:Number = (tmp12p2 + tmp13p2) * 0.707106781; /* c4 */
                data[int(dataOff+16)] = tmp13p2 + z1p2; /* phase 5 */
                data[int(dataOff+48)] = tmp13p2 - z1p2;

                /* Odd part */
                tmp10p2 = tmp4p2 + tmp5p2; /* phase 2 */
                tmp11p2 = tmp5p2 + tmp6p2;
                tmp12p2 = tmp6p2 + tmp7p2;

                /* The rotator is modified from fig 4-8 to avoid extra negations. */
                var z5p2:Number = (tmp10p2 - tmp12p2) * 0.382683433; /* c6 */
                var z2p2:Number = 0.541196100 * tmp10p2 + z5p2; /* c2-c6 */
                var z4p2:Number = 1.306562965 * tmp12p2 + z5p2; /* c2+c6 */
                var z3p2:Number= tmp11p2 * 0.707106781; /* c4 */

                var z11p2:Number = tmp7p2 + z3p2;   /* phase 5 */
                var z13p2:Number = tmp7p2 - z3p2;

                data[int(dataOff+40)] = z13p2 + z2p2; /* phase 6 */
                data[int(dataOff+24)] = z13p2 - z2p2;
                data[int(dataOff+ 8)] = z11p2 + z4p2;
                data[int(dataOff+56)] = z11p2 - z4p2;

                dataOff++; /* advance pointer to next column */
            }

            // Quantize/descale the coefficients
            var fDCTQuant:Number;
            for (i=0; i<I64; ++i)
            {
                // Apply the quantization and scaling factor & Round to nearest integer
                fDCTQuant = data[int(i)]*fdtbl[int(i)];
                outputfDCTQuant[int(i)] = (fDCTQuant > 0.0) ? int(fDCTQuant + 0.5) : int(fDCTQuant - 0.5);
            }
            return outputfDCTQuant;
        }

        // Chunk writing
        private function writeAPP0():void
        {
            byteout.writeShort(0xFFE0); // marker
            byteout.writeShort(16); // length
            byteout.writeByte(0x4A); // J
            byteout.writeByte(0x46); // F
            byteout.writeByte(0x49); // I
            byteout.writeByte(0x46); // F
            byteout.writeByte(0); // = "JFIF",'\0'
            byteout.writeByte(1); // versionhi
            byteout.writeByte(1); // versionlo
            byteout.writeByte(0); // xyunits
            byteout.writeShort(1); // xdensity
            byteout.writeShort(1); // ydensity
            byteout.writeByte(0); // thumbnwidth
            byteout.writeByte(0); // thumbnheight
        }

        private function writeSOF0(width:int, height:int):void
        {
            byteout.writeShort(0xFFC0); // marker
            byteout.writeShort(17);   // length, truecolor YUV JPG
            byteout.writeByte(8);    // precision
            byteout.writeShort(height);
            byteout.writeShort(width);
            byteout.writeByte(3);    // nrofcomponents
            byteout.writeByte(1);    // IdY
            byteout.writeByte(0x11); // HVY
            byteout.writeByte(0);    // QTY
            byteout.writeByte(2);    // IdU
            byteout.writeByte(0x11); // HVU
            byteout.writeByte(1);    // QTU
            byteout.writeByte(3);    // IdV
            byteout.writeByte(0x11); // HVV
            byteout.writeByte(1);    // QTV
        }

        private function writeDQT():void
        {
            byteout.writeShort(0xFFDB); // marker
            byteout.writeShort(132);       // length
            byteout.writeByte(0);

            var i:int;
            const I64:int = 64;
            for (i=0; i<I64; ++i)
                byteout.writeByte(YTable[i]);

            byteout.writeByte(1);

            for (i=0; i<I64; ++i)
                byteout.writeByte(UVTable[i]);
        }

        private function writeDHT():void
        {
            byteout.writeShort(0xFFC4); // marker
            byteout.writeShort(0x01A2); // length

            byteout.writeByte(0); // HTYDCinfo
            var i:int;
            const I11:int = 11;
            const I16:int = 16;
            const I161:int = 161;
            for (i=0; i<I16; ++i)
                byteout.writeByte(std_dc_luminance_nrcodes[int(i+1)]);

            for (i=0; i<=I11; ++i)
                byteout.writeByte(std_dc_luminance_values[i]);

            byteout.writeByte(0x10); // HTYACinfo

            for (i=0; i<I16; ++i)
                byteout.writeByte(std_ac_luminance_nrcodes[int(i+1)]);

            for (i=0; i<=I161; ++i)
                byteout.writeByte(std_ac_luminance_values[i]);

            byteout.writeByte(1); // HTUDCinfo

            for (i=0; i<I16; ++i)
                byteout.writeByte(std_dc_chrominance_nrcodes[int(i+1)]);

            for (i=0; i<=I11; ++i)
                byteout.writeByte(std_dc_chrominance_values[i]);

            byteout.writeByte(0x11); // HTUACinfo

            for (i=0; i<I16; ++i)
                byteout.writeByte(std_ac_chrominance_nrcodes[int(i+1)]);

            for (i=0; i<=I161; ++i)
                byteout.writeByte(std_ac_chrominance_values[i]);
        }

        private function writeSOS():void
        {
            byteout.writeShort(0xFFDA); // marker
            byteout.writeShort(12); // length
            byteout.writeByte(3); // nrofcomponents
            byteout.writeByte(1); // IdY
            byteout.writeByte(0); // HTY
            byteout.writeByte(2); // IdU
            byteout.writeByte(0x11); // HTU
            byteout.writeByte(3); // IdV
            byteout.writeByte(0x11); // HTV
            byteout.writeByte(0); // Ss
            byteout.writeByte(0x3f); // Se
            byteout.writeByte(0); // Bf
        }

        // Core processing
        internal var DU:Vector.<int> = new Vector.<int>(64, true);

        private function processDU(CDU:Vector.<Number>, fdtbl:Vector.<Number>, DC:Number, HTDC:Vector.<BitString>, HTAC:Vector.<BitString>):Number
        {
            var EOB:BitString = HTAC[0x00];
            var M16zeroes:BitString = HTAC[0xF0];
            var pos:int;
            const I16:int = 16;
            const I63:int = 63;
            const I64:int = 64;
            var DU_DCT:Vector.<int> = fDCTQuant(CDU, fdtbl);
            //ZigZag reorder
            for (var j:int=0;j<I64;++j) {
                DU[ZigZag[j]]=DU_DCT[j];
            }
            var Diff:int = DU[0] - DC; DC = DU[0];
            //Encode DC
            if (Diff==0) {
                writeBits(HTDC[0]); // Diff might be 0
            } else {
                pos = int(32767+Diff);
                writeBits(HTDC[category[pos]]);
                writeBits(bitcode[pos]);
            }
            //Encode ACs
            const end0pos:int = 63;
            for (; (end0pos>0)&&(DU[end0pos]==0); end0pos--) {};
            //end0pos = first element in reverse order !=0
            if ( end0pos == 0) {
                writeBits(EOB);
                return DC;
            }
            var i:int = 1;
            var lng:int;
            while ( i <= end0pos ) {
                var startpos:int = i;
                for (; (DU[i]==0) && (i<=end0pos); ++i) {}
                var nrzeroes:int = i-startpos;
                if ( nrzeroes >= I16 ) {
                    lng = nrzeroes>>4;
                    for (var nrmarker:int=1; nrmarker <= lng; ++nrmarker)
                        writeBits(M16zeroes);
                    nrzeroes = int(nrzeroes&0xF);
                }
                pos = int(32767+DU[i]);
                writeBits(HTAC[int((nrzeroes<<4)+category[pos])]);
                writeBits(bitcode[pos]);
                i++;
            }
            if ( end0pos != I63 ) {
                writeBits(EOB);
            }
            return DC;
        }

        private var YDU:Vector.<Number> = new Vector.<Number>(64, true);
        private var UDU:Vector.<Number> = new Vector.<Number>(64, true);
        private var VDU:Vector.<Number> = new Vector.<Number>(64, true);

        private function RGB2YUV(img:BitmapData, xpos:int, ypos:int):void
        {
            var pos:int=0;
            const I8:int = 8;
            for (var y:int=0; y<I8; ++y) {
                for (var x:int=0; x<I8; ++x) {
                    var P:uint = img.getPixel32(xpos+x,ypos+y);
                    var R:Number = (P>>16)&0xFF;
                    var G:Number = (P>> 8)&0xFF;
                    var B:Number = (P    )&0xFF;
                    YDU[int(pos)]=((( 0.29900)*R+( 0.58700)*G+( 0.11400)*B))-0x80;
                    UDU[int(pos)]=(((-0.16874)*R+(-0.33126)*G+( 0.50000)*B));
                    VDU[int(pos)]=((( 0.50000)*R+(-0.41869)*G+(-0.08131)*B));
                    ++pos;
                }
            }
        }

        public function JPEGEncoderTS(quality:int=50)
        {
            if (quality <= 0)
                quality = 1;

            if (quality > 100)
                quality = 100;

            sf = quality < 50 ? int(5000 / quality) : int(200 - (quality<<1));
            init();
        }

        private function init():void
        {
            ZigZag.fixed = true;
            aasf.fixed = true;
            YQT.fixed = true;
            UVQT.fixed = true;
            std_ac_chrominance_nrcodes.fixed = true;
            std_ac_chrominance_values.fixed = true;
            std_ac_luminance_nrcodes.fixed = true;
            std_ac_luminance_values.fixed = true;
            std_dc_chrominance_nrcodes.fixed = true;
            std_dc_chrominance_values.fixed = true;
            std_dc_luminance_nrcodes.fixed = true;
            std_dc_luminance_values.fixed = true;
            // Create tables
            initHuffmanTbl();
            initCategoryNumber();
            initQuantTables(sf);
        }

        public function encode(image:BitmapData):ByteArray
        {
            // Initialize bit writer
            byteout = new ByteArray();

            bytenew=0;
            bytepos=7;

            // Add JPEG headers
            byteout.writeShort(0xFFD8); // SOI
            writeAPP0();
            writeDQT();
            writeSOF0(image.width,image.height);
            writeDHT();
            writeSOS();

            // Encode 8x8 macroblocks
            var DCY:Number=0;
            var DCU:Number=0;
            var DCV:Number=0;
            bytenew=0;
            bytepos=7;

            var width:int = image.width;
            var height:int = image.height;

            for (var ypos:int=0; ypos<height; ypos+=8)
            {
                for (var xpos:int=0; xpos<width; xpos+=8)
                {
                    RGB2YUV(image, xpos, ypos);
                    DCY = processDU(YDU, fdtbl_Y, DCY, YDC_HT, YAC_HT);
                    DCU = processDU(UDU, fdtbl_UV, DCU, UVDC_HT, UVAC_HT);
                    DCV = processDU(VDU, fdtbl_UV, DCV, UVDC_HT, UVAC_HT);
                }
            }

            // Do the bit alignment of the EOI marker
            if ( bytepos >= 0 )
            {
                var fillbits:BitString = new BitString();
                fillbits.len = bytepos+1;
                fillbits.val = (1<<(bytepos+1))-1;
                writeBits(fillbits);
            }
            byteout.writeShort(0xFFD9); //EOI
            return byteout;
        }
    }
}

final class BitString
{
    public var len:int = 0;
    public var val:int = 0;
}