865 lines
24 KiB
JavaScript
865 lines
24 KiB
JavaScript
import {
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BaseDecoder
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} from "./chunk-C5KGH6RQ.js";
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import "./chunk-LK32TJAX.js";
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// node_modules/geotiff/dist-module/compression/jpeg.js
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var dctZigZag = new Int32Array([
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0,
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1,
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8,
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16,
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9,
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2,
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|
3,
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|
10,
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|
17,
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24,
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32,
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|
25,
|
|
18,
|
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11,
|
|
4,
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5,
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12,
|
|
19,
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26,
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|
33,
|
|
40,
|
|
48,
|
|
41,
|
|
34,
|
|
27,
|
|
20,
|
|
13,
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6,
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7,
|
|
14,
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|
21,
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28,
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35,
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42,
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49,
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56,
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57,
|
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50,
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43,
|
|
36,
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29,
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22,
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15,
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23,
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30,
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37,
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44,
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51,
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58,
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59,
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52,
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45,
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38,
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31,
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39,
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46,
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53,
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60,
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61,
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54,
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47,
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55,
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62,
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63
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]);
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var dctCos1 = 4017;
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var dctSin1 = 799;
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var dctCos3 = 3406;
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var dctSin3 = 2276;
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var dctCos6 = 1567;
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var dctSin6 = 3784;
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var dctSqrt2 = 5793;
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var dctSqrt1d2 = 2896;
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function buildHuffmanTable(codeLengths, values) {
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let k = 0;
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const code = [];
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let length = 16;
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while (length > 0 && !codeLengths[length - 1]) {
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--length;
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}
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code.push({ children: [], index: 0 });
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let p = code[0];
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let q;
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for (let i = 0; i < length; i++) {
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for (let j = 0; j < codeLengths[i]; j++) {
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p = code.pop();
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p.children[p.index] = values[k];
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while (p.index > 0) {
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p = code.pop();
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}
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p.index++;
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code.push(p);
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while (code.length <= i) {
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code.push(q = { children: [], index: 0 });
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p.children[p.index] = q.children;
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p = q;
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}
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k++;
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}
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if (i + 1 < length) {
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code.push(q = { children: [], index: 0 });
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p.children[p.index] = q.children;
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p = q;
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}
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}
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return code[0].children;
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}
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function decodeScan(data, initialOffset, frame, components, resetInterval, spectralStart, spectralEnd, successivePrev, successive) {
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const { mcusPerLine, progressive } = frame;
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const startOffset = initialOffset;
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let offset = initialOffset;
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let bitsData = 0;
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let bitsCount = 0;
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function readBit() {
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if (bitsCount > 0) {
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bitsCount--;
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return bitsData >> bitsCount & 1;
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}
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bitsData = data[offset++];
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if (bitsData === 255) {
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const nextByte = data[offset++];
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if (nextByte) {
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throw new Error(`unexpected marker: ${(bitsData << 8 | nextByte).toString(16)}`);
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}
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}
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bitsCount = 7;
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return bitsData >>> 7;
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}
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function decodeHuffman(tree) {
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let node = tree;
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let bit;
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while ((bit = readBit()) !== null) {
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node = node[bit];
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if (typeof node === "number") {
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return node;
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}
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if (typeof node !== "object") {
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throw new Error("invalid huffman sequence");
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}
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}
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return null;
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}
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function receive(initialLength) {
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let length = initialLength;
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let n2 = 0;
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while (length > 0) {
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const bit = readBit();
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if (bit === null) {
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return void 0;
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}
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n2 = n2 << 1 | bit;
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--length;
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}
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return n2;
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}
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function receiveAndExtend(length) {
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const n2 = receive(length);
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if (n2 >= 1 << length - 1) {
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return n2;
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}
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return n2 + (-1 << length) + 1;
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}
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function decodeBaseline(component2, zz) {
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const t = decodeHuffman(component2.huffmanTableDC);
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const diff = t === 0 ? 0 : receiveAndExtend(t);
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component2.pred += diff;
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zz[0] = component2.pred;
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let k2 = 1;
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while (k2 < 64) {
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const rs = decodeHuffman(component2.huffmanTableAC);
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const s = rs & 15;
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const r = rs >> 4;
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if (s === 0) {
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if (r < 15) {
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break;
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}
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k2 += 16;
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} else {
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k2 += r;
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const z = dctZigZag[k2];
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zz[z] = receiveAndExtend(s);
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k2++;
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}
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}
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}
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function decodeDCFirst(component2, zz) {
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const t = decodeHuffman(component2.huffmanTableDC);
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const diff = t === 0 ? 0 : receiveAndExtend(t) << successive;
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component2.pred += diff;
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zz[0] = component2.pred;
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}
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function decodeDCSuccessive(component2, zz) {
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zz[0] |= readBit() << successive;
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}
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let eobrun = 0;
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function decodeACFirst(component2, zz) {
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if (eobrun > 0) {
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eobrun--;
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return;
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}
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let k2 = spectralStart;
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const e = spectralEnd;
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while (k2 <= e) {
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const rs = decodeHuffman(component2.huffmanTableAC);
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const s = rs & 15;
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const r = rs >> 4;
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if (s === 0) {
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if (r < 15) {
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eobrun = receive(r) + (1 << r) - 1;
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break;
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}
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k2 += 16;
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} else {
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k2 += r;
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const z = dctZigZag[k2];
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zz[z] = receiveAndExtend(s) * (1 << successive);
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k2++;
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}
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}
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}
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let successiveACState = 0;
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let successiveACNextValue;
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function decodeACSuccessive(component2, zz) {
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let k2 = spectralStart;
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const e = spectralEnd;
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let r = 0;
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while (k2 <= e) {
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const z = dctZigZag[k2];
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const direction = zz[z] < 0 ? -1 : 1;
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switch (successiveACState) {
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case 0: {
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const rs = decodeHuffman(component2.huffmanTableAC);
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const s = rs & 15;
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r = rs >> 4;
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if (s === 0) {
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if (r < 15) {
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eobrun = receive(r) + (1 << r);
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successiveACState = 4;
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} else {
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r = 16;
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successiveACState = 1;
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}
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} else {
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if (s !== 1) {
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throw new Error("invalid ACn encoding");
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}
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successiveACNextValue = receiveAndExtend(s);
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successiveACState = r ? 2 : 3;
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}
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continue;
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}
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case 1:
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// skipping r zero items
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case 2:
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if (zz[z]) {
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zz[z] += (readBit() << successive) * direction;
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} else {
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r--;
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if (r === 0) {
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successiveACState = successiveACState === 2 ? 3 : 0;
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}
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}
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break;
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case 3:
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if (zz[z]) {
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zz[z] += (readBit() << successive) * direction;
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} else {
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zz[z] = successiveACNextValue << successive;
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successiveACState = 0;
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}
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break;
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case 4:
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if (zz[z]) {
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zz[z] += (readBit() << successive) * direction;
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}
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break;
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default:
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break;
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}
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k2++;
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}
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if (successiveACState === 4) {
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eobrun--;
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if (eobrun === 0) {
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successiveACState = 0;
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}
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}
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}
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function decodeMcu(component2, decodeFunction, mcu2, row, col) {
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const mcuRow = mcu2 / mcusPerLine | 0;
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const mcuCol = mcu2 % mcusPerLine;
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const blockRow = mcuRow * component2.v + row;
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const blockCol = mcuCol * component2.h + col;
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decodeFunction(component2, component2.blocks[blockRow][blockCol]);
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}
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function decodeBlock(component2, decodeFunction, mcu2) {
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const blockRow = mcu2 / component2.blocksPerLine | 0;
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const blockCol = mcu2 % component2.blocksPerLine;
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decodeFunction(component2, component2.blocks[blockRow][blockCol]);
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}
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const componentsLength = components.length;
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let component;
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let i;
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let j;
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let k;
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let n;
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let decodeFn;
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if (progressive) {
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if (spectralStart === 0) {
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decodeFn = successivePrev === 0 ? decodeDCFirst : decodeDCSuccessive;
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} else {
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decodeFn = successivePrev === 0 ? decodeACFirst : decodeACSuccessive;
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}
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} else {
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decodeFn = decodeBaseline;
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}
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let mcu = 0;
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let marker;
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let mcuExpected;
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if (componentsLength === 1) {
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mcuExpected = components[0].blocksPerLine * components[0].blocksPerColumn;
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} else {
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mcuExpected = mcusPerLine * frame.mcusPerColumn;
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}
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const usedResetInterval = resetInterval || mcuExpected;
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while (mcu < mcuExpected) {
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for (i = 0; i < componentsLength; i++) {
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components[i].pred = 0;
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}
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eobrun = 0;
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if (componentsLength === 1) {
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component = components[0];
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for (n = 0; n < usedResetInterval; n++) {
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decodeBlock(component, decodeFn, mcu);
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mcu++;
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}
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} else {
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for (n = 0; n < usedResetInterval; n++) {
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for (i = 0; i < componentsLength; i++) {
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component = components[i];
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const { h, v } = component;
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for (j = 0; j < v; j++) {
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for (k = 0; k < h; k++) {
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decodeMcu(component, decodeFn, mcu, j, k);
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}
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}
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}
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mcu++;
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if (mcu === mcuExpected) {
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break;
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}
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}
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}
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bitsCount = 0;
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marker = data[offset] << 8 | data[offset + 1];
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if (marker < 65280) {
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throw new Error("marker was not found");
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}
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if (marker >= 65488 && marker <= 65495) {
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offset += 2;
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} else {
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break;
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}
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}
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return offset - startOffset;
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}
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function buildComponentData(frame, component) {
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const lines = [];
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const { blocksPerLine, blocksPerColumn } = component;
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const samplesPerLine = blocksPerLine << 3;
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const R = new Int32Array(64);
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const r = new Uint8Array(64);
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function quantizeAndInverse(zz, dataOut, dataIn) {
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const qt = component.quantizationTable;
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let v0;
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let v1;
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let v2;
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let v3;
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let v4;
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let v5;
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let v6;
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let v7;
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let t;
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const p = dataIn;
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let i;
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for (i = 0; i < 64; i++) {
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p[i] = zz[i] * qt[i];
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}
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for (i = 0; i < 8; ++i) {
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const row = 8 * i;
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if (p[1 + row] === 0 && p[2 + row] === 0 && p[3 + row] === 0 && p[4 + row] === 0 && p[5 + row] === 0 && p[6 + row] === 0 && p[7 + row] === 0) {
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t = dctSqrt2 * p[0 + row] + 512 >> 10;
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p[0 + row] = t;
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p[1 + row] = t;
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p[2 + row] = t;
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p[3 + row] = t;
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p[4 + row] = t;
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p[5 + row] = t;
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p[6 + row] = t;
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p[7 + row] = t;
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continue;
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}
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v0 = dctSqrt2 * p[0 + row] + 128 >> 8;
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v1 = dctSqrt2 * p[4 + row] + 128 >> 8;
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v2 = p[2 + row];
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v3 = p[6 + row];
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v4 = dctSqrt1d2 * (p[1 + row] - p[7 + row]) + 128 >> 8;
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v7 = dctSqrt1d2 * (p[1 + row] + p[7 + row]) + 128 >> 8;
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v5 = p[3 + row] << 4;
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v6 = p[5 + row] << 4;
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t = v0 - v1 + 1 >> 1;
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v0 = v0 + v1 + 1 >> 1;
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v1 = t;
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t = v2 * dctSin6 + v3 * dctCos6 + 128 >> 8;
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v2 = v2 * dctCos6 - v3 * dctSin6 + 128 >> 8;
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v3 = t;
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t = v4 - v6 + 1 >> 1;
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v4 = v4 + v6 + 1 >> 1;
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v6 = t;
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t = v7 + v5 + 1 >> 1;
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v5 = v7 - v5 + 1 >> 1;
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v7 = t;
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t = v0 - v3 + 1 >> 1;
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v0 = v0 + v3 + 1 >> 1;
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v3 = t;
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t = v1 - v2 + 1 >> 1;
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v1 = v1 + v2 + 1 >> 1;
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v2 = t;
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t = v4 * dctSin3 + v7 * dctCos3 + 2048 >> 12;
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v4 = v4 * dctCos3 - v7 * dctSin3 + 2048 >> 12;
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v7 = t;
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t = v5 * dctSin1 + v6 * dctCos1 + 2048 >> 12;
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v5 = v5 * dctCos1 - v6 * dctSin1 + 2048 >> 12;
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v6 = t;
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p[0 + row] = v0 + v7;
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p[7 + row] = v0 - v7;
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p[1 + row] = v1 + v6;
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p[6 + row] = v1 - v6;
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p[2 + row] = v2 + v5;
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p[5 + row] = v2 - v5;
|
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p[3 + row] = v3 + v4;
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p[4 + row] = v3 - v4;
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}
|
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for (i = 0; i < 8; ++i) {
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const col = i;
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if (p[1 * 8 + col] === 0 && p[2 * 8 + col] === 0 && p[3 * 8 + col] === 0 && p[4 * 8 + col] === 0 && p[5 * 8 + col] === 0 && p[6 * 8 + col] === 0 && p[7 * 8 + col] === 0) {
|
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t = dctSqrt2 * dataIn[i + 0] + 8192 >> 14;
|
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p[0 * 8 + col] = t;
|
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p[1 * 8 + col] = t;
|
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p[2 * 8 + col] = t;
|
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p[3 * 8 + col] = t;
|
|
p[4 * 8 + col] = t;
|
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p[5 * 8 + col] = t;
|
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p[6 * 8 + col] = t;
|
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p[7 * 8 + col] = t;
|
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continue;
|
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}
|
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v0 = dctSqrt2 * p[0 * 8 + col] + 2048 >> 12;
|
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v1 = dctSqrt2 * p[4 * 8 + col] + 2048 >> 12;
|
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v2 = p[2 * 8 + col];
|
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v3 = p[6 * 8 + col];
|
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v4 = dctSqrt1d2 * (p[1 * 8 + col] - p[7 * 8 + col]) + 2048 >> 12;
|
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v7 = dctSqrt1d2 * (p[1 * 8 + col] + p[7 * 8 + col]) + 2048 >> 12;
|
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v5 = p[3 * 8 + col];
|
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v6 = p[5 * 8 + col];
|
|
t = v0 - v1 + 1 >> 1;
|
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v0 = v0 + v1 + 1 >> 1;
|
|
v1 = t;
|
|
t = v2 * dctSin6 + v3 * dctCos6 + 2048 >> 12;
|
|
v2 = v2 * dctCos6 - v3 * dctSin6 + 2048 >> 12;
|
|
v3 = t;
|
|
t = v4 - v6 + 1 >> 1;
|
|
v4 = v4 + v6 + 1 >> 1;
|
|
v6 = t;
|
|
t = v7 + v5 + 1 >> 1;
|
|
v5 = v7 - v5 + 1 >> 1;
|
|
v7 = t;
|
|
t = v0 - v3 + 1 >> 1;
|
|
v0 = v0 + v3 + 1 >> 1;
|
|
v3 = t;
|
|
t = v1 - v2 + 1 >> 1;
|
|
v1 = v1 + v2 + 1 >> 1;
|
|
v2 = t;
|
|
t = v4 * dctSin3 + v7 * dctCos3 + 2048 >> 12;
|
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v4 = v4 * dctCos3 - v7 * dctSin3 + 2048 >> 12;
|
|
v7 = t;
|
|
t = v5 * dctSin1 + v6 * dctCos1 + 2048 >> 12;
|
|
v5 = v5 * dctCos1 - v6 * dctSin1 + 2048 >> 12;
|
|
v6 = t;
|
|
p[0 * 8 + col] = v0 + v7;
|
|
p[7 * 8 + col] = v0 - v7;
|
|
p[1 * 8 + col] = v1 + v6;
|
|
p[6 * 8 + col] = v1 - v6;
|
|
p[2 * 8 + col] = v2 + v5;
|
|
p[5 * 8 + col] = v2 - v5;
|
|
p[3 * 8 + col] = v3 + v4;
|
|
p[4 * 8 + col] = v3 - v4;
|
|
}
|
|
for (i = 0; i < 64; ++i) {
|
|
const sample = 128 + (p[i] + 8 >> 4);
|
|
if (sample < 0) {
|
|
dataOut[i] = 0;
|
|
} else if (sample > 255) {
|
|
dataOut[i] = 255;
|
|
} else {
|
|
dataOut[i] = sample;
|
|
}
|
|
}
|
|
}
|
|
for (let blockRow = 0; blockRow < blocksPerColumn; blockRow++) {
|
|
const scanLine = blockRow << 3;
|
|
for (let i = 0; i < 8; i++) {
|
|
lines.push(new Uint8Array(samplesPerLine));
|
|
}
|
|
for (let blockCol = 0; blockCol < blocksPerLine; blockCol++) {
|
|
quantizeAndInverse(component.blocks[blockRow][blockCol], r, R);
|
|
let offset = 0;
|
|
const sample = blockCol << 3;
|
|
for (let j = 0; j < 8; j++) {
|
|
const line = lines[scanLine + j];
|
|
for (let i = 0; i < 8; i++) {
|
|
line[sample + i] = r[offset++];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return lines;
|
|
}
|
|
var JpegStreamReader = class {
|
|
constructor() {
|
|
this.jfif = null;
|
|
this.adobe = null;
|
|
this.quantizationTables = [];
|
|
this.huffmanTablesAC = [];
|
|
this.huffmanTablesDC = [];
|
|
this.resetFrames();
|
|
}
|
|
resetFrames() {
|
|
this.frames = [];
|
|
}
|
|
parse(data) {
|
|
let offset = 0;
|
|
function readUint16() {
|
|
const value = data[offset] << 8 | data[offset + 1];
|
|
offset += 2;
|
|
return value;
|
|
}
|
|
function readDataBlock() {
|
|
const length = readUint16();
|
|
const array = data.subarray(offset, offset + length - 2);
|
|
offset += array.length;
|
|
return array;
|
|
}
|
|
function prepareComponents(frame) {
|
|
let maxH = 0;
|
|
let maxV = 0;
|
|
let component;
|
|
let componentId;
|
|
for (componentId in frame.components) {
|
|
if (frame.components.hasOwnProperty(componentId)) {
|
|
component = frame.components[componentId];
|
|
if (maxH < component.h) {
|
|
maxH = component.h;
|
|
}
|
|
if (maxV < component.v) {
|
|
maxV = component.v;
|
|
}
|
|
}
|
|
}
|
|
const mcusPerLine = Math.ceil(frame.samplesPerLine / 8 / maxH);
|
|
const mcusPerColumn = Math.ceil(frame.scanLines / 8 / maxV);
|
|
for (componentId in frame.components) {
|
|
if (frame.components.hasOwnProperty(componentId)) {
|
|
component = frame.components[componentId];
|
|
const blocksPerLine = Math.ceil(Math.ceil(frame.samplesPerLine / 8) * component.h / maxH);
|
|
const blocksPerColumn = Math.ceil(Math.ceil(frame.scanLines / 8) * component.v / maxV);
|
|
const blocksPerLineForMcu = mcusPerLine * component.h;
|
|
const blocksPerColumnForMcu = mcusPerColumn * component.v;
|
|
const blocks = [];
|
|
for (let i = 0; i < blocksPerColumnForMcu; i++) {
|
|
const row = [];
|
|
for (let j = 0; j < blocksPerLineForMcu; j++) {
|
|
row.push(new Int32Array(64));
|
|
}
|
|
blocks.push(row);
|
|
}
|
|
component.blocksPerLine = blocksPerLine;
|
|
component.blocksPerColumn = blocksPerColumn;
|
|
component.blocks = blocks;
|
|
}
|
|
}
|
|
frame.maxH = maxH;
|
|
frame.maxV = maxV;
|
|
frame.mcusPerLine = mcusPerLine;
|
|
frame.mcusPerColumn = mcusPerColumn;
|
|
}
|
|
let fileMarker = readUint16();
|
|
if (fileMarker !== 65496) {
|
|
throw new Error("SOI not found");
|
|
}
|
|
fileMarker = readUint16();
|
|
while (fileMarker !== 65497) {
|
|
switch (fileMarker) {
|
|
case 65280:
|
|
break;
|
|
case 65504:
|
|
// APP0 (Application Specific)
|
|
case 65505:
|
|
// APP1
|
|
case 65506:
|
|
// APP2
|
|
case 65507:
|
|
// APP3
|
|
case 65508:
|
|
// APP4
|
|
case 65509:
|
|
// APP5
|
|
case 65510:
|
|
// APP6
|
|
case 65511:
|
|
// APP7
|
|
case 65512:
|
|
// APP8
|
|
case 65513:
|
|
// APP9
|
|
case 65514:
|
|
// APP10
|
|
case 65515:
|
|
// APP11
|
|
case 65516:
|
|
// APP12
|
|
case 65517:
|
|
// APP13
|
|
case 65518:
|
|
// APP14
|
|
case 65519:
|
|
// APP15
|
|
case 65534: {
|
|
const appData = readDataBlock();
|
|
if (fileMarker === 65504) {
|
|
if (appData[0] === 74 && appData[1] === 70 && appData[2] === 73 && appData[3] === 70 && appData[4] === 0) {
|
|
this.jfif = {
|
|
version: { major: appData[5], minor: appData[6] },
|
|
densityUnits: appData[7],
|
|
xDensity: appData[8] << 8 | appData[9],
|
|
yDensity: appData[10] << 8 | appData[11],
|
|
thumbWidth: appData[12],
|
|
thumbHeight: appData[13],
|
|
thumbData: appData.subarray(14, 14 + 3 * appData[12] * appData[13])
|
|
};
|
|
}
|
|
}
|
|
if (fileMarker === 65518) {
|
|
if (appData[0] === 65 && appData[1] === 100 && appData[2] === 111 && appData[3] === 98 && appData[4] === 101 && appData[5] === 0) {
|
|
this.adobe = {
|
|
version: appData[6],
|
|
flags0: appData[7] << 8 | appData[8],
|
|
flags1: appData[9] << 8 | appData[10],
|
|
transformCode: appData[11]
|
|
};
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case 65499: {
|
|
const quantizationTablesLength = readUint16();
|
|
const quantizationTablesEnd = quantizationTablesLength + offset - 2;
|
|
while (offset < quantizationTablesEnd) {
|
|
const quantizationTableSpec = data[offset++];
|
|
const tableData = new Int32Array(64);
|
|
if (quantizationTableSpec >> 4 === 0) {
|
|
for (let j = 0; j < 64; j++) {
|
|
const z = dctZigZag[j];
|
|
tableData[z] = data[offset++];
|
|
}
|
|
} else if (quantizationTableSpec >> 4 === 1) {
|
|
for (let j = 0; j < 64; j++) {
|
|
const z = dctZigZag[j];
|
|
tableData[z] = readUint16();
|
|
}
|
|
} else {
|
|
throw new Error("DQT: invalid table spec");
|
|
}
|
|
this.quantizationTables[quantizationTableSpec & 15] = tableData;
|
|
}
|
|
break;
|
|
}
|
|
case 65472:
|
|
// SOF0 (Start of Frame, Baseline DCT)
|
|
case 65473:
|
|
// SOF1 (Start of Frame, Extended DCT)
|
|
case 65474: {
|
|
readUint16();
|
|
const frame = {
|
|
extended: fileMarker === 65473,
|
|
progressive: fileMarker === 65474,
|
|
precision: data[offset++],
|
|
scanLines: readUint16(),
|
|
samplesPerLine: readUint16(),
|
|
components: {},
|
|
componentsOrder: []
|
|
};
|
|
const componentsCount = data[offset++];
|
|
let componentId;
|
|
for (let i = 0; i < componentsCount; i++) {
|
|
componentId = data[offset];
|
|
const h = data[offset + 1] >> 4;
|
|
const v = data[offset + 1] & 15;
|
|
const qId = data[offset + 2];
|
|
frame.componentsOrder.push(componentId);
|
|
frame.components[componentId] = {
|
|
h,
|
|
v,
|
|
quantizationIdx: qId
|
|
};
|
|
offset += 3;
|
|
}
|
|
prepareComponents(frame);
|
|
this.frames.push(frame);
|
|
break;
|
|
}
|
|
case 65476: {
|
|
const huffmanLength = readUint16();
|
|
for (let i = 2; i < huffmanLength; ) {
|
|
const huffmanTableSpec = data[offset++];
|
|
const codeLengths = new Uint8Array(16);
|
|
let codeLengthSum = 0;
|
|
for (let j = 0; j < 16; j++, offset++) {
|
|
codeLengths[j] = data[offset];
|
|
codeLengthSum += codeLengths[j];
|
|
}
|
|
const huffmanValues = new Uint8Array(codeLengthSum);
|
|
for (let j = 0; j < codeLengthSum; j++, offset++) {
|
|
huffmanValues[j] = data[offset];
|
|
}
|
|
i += 17 + codeLengthSum;
|
|
if (huffmanTableSpec >> 4 === 0) {
|
|
this.huffmanTablesDC[huffmanTableSpec & 15] = buildHuffmanTable(
|
|
codeLengths,
|
|
huffmanValues
|
|
);
|
|
} else {
|
|
this.huffmanTablesAC[huffmanTableSpec & 15] = buildHuffmanTable(
|
|
codeLengths,
|
|
huffmanValues
|
|
);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case 65501:
|
|
readUint16();
|
|
this.resetInterval = readUint16();
|
|
break;
|
|
case 65498: {
|
|
readUint16();
|
|
const selectorsCount = data[offset++];
|
|
const components = [];
|
|
const frame = this.frames[0];
|
|
for (let i = 0; i < selectorsCount; i++) {
|
|
const component = frame.components[data[offset++]];
|
|
const tableSpec = data[offset++];
|
|
component.huffmanTableDC = this.huffmanTablesDC[tableSpec >> 4];
|
|
component.huffmanTableAC = this.huffmanTablesAC[tableSpec & 15];
|
|
components.push(component);
|
|
}
|
|
const spectralStart = data[offset++];
|
|
const spectralEnd = data[offset++];
|
|
const successiveApproximation = data[offset++];
|
|
const processed = decodeScan(
|
|
data,
|
|
offset,
|
|
frame,
|
|
components,
|
|
this.resetInterval,
|
|
spectralStart,
|
|
spectralEnd,
|
|
successiveApproximation >> 4,
|
|
successiveApproximation & 15
|
|
);
|
|
offset += processed;
|
|
break;
|
|
}
|
|
case 65535:
|
|
if (data[offset] !== 255) {
|
|
offset--;
|
|
}
|
|
break;
|
|
default:
|
|
if (data[offset - 3] === 255 && data[offset - 2] >= 192 && data[offset - 2] <= 254) {
|
|
offset -= 3;
|
|
break;
|
|
}
|
|
throw new Error(`unknown JPEG marker ${fileMarker.toString(16)}`);
|
|
}
|
|
fileMarker = readUint16();
|
|
}
|
|
}
|
|
getResult() {
|
|
const { frames } = this;
|
|
if (this.frames.length === 0) {
|
|
throw new Error("no frames were decoded");
|
|
} else if (this.frames.length > 1) {
|
|
console.warn("more than one frame is not supported");
|
|
}
|
|
for (let i = 0; i < this.frames.length; i++) {
|
|
const cp = this.frames[i].components;
|
|
for (const j of Object.keys(cp)) {
|
|
cp[j].quantizationTable = this.quantizationTables[cp[j].quantizationIdx];
|
|
delete cp[j].quantizationIdx;
|
|
}
|
|
}
|
|
const frame = frames[0];
|
|
const { components, componentsOrder } = frame;
|
|
const outComponents = [];
|
|
const width = frame.samplesPerLine;
|
|
const height = frame.scanLines;
|
|
for (let i = 0; i < componentsOrder.length; i++) {
|
|
const component = components[componentsOrder[i]];
|
|
outComponents.push({
|
|
lines: buildComponentData(frame, component),
|
|
scaleX: component.h / frame.maxH,
|
|
scaleY: component.v / frame.maxV
|
|
});
|
|
}
|
|
const out = new Uint8Array(width * height * outComponents.length);
|
|
let oi = 0;
|
|
for (let y = 0; y < height; ++y) {
|
|
for (let x = 0; x < width; ++x) {
|
|
for (let i = 0; i < outComponents.length; ++i) {
|
|
const component = outComponents[i];
|
|
out[oi] = component.lines[0 | y * component.scaleY][0 | x * component.scaleX];
|
|
++oi;
|
|
}
|
|
}
|
|
}
|
|
return out;
|
|
}
|
|
};
|
|
var JpegDecoder = class extends BaseDecoder {
|
|
constructor(fileDirectory) {
|
|
super();
|
|
this.reader = new JpegStreamReader();
|
|
if (fileDirectory.JPEGTables) {
|
|
this.reader.parse(fileDirectory.JPEGTables);
|
|
}
|
|
}
|
|
decodeBlock(buffer) {
|
|
this.reader.resetFrames();
|
|
this.reader.parse(new Uint8Array(buffer));
|
|
return this.reader.getResult().buffer;
|
|
}
|
|
};
|
|
export {
|
|
JpegDecoder as default
|
|
};
|
|
//# sourceMappingURL=jpeg-JHDJFPDY.js.map
|