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Support EPH and SOP markers.

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This commit is contained in:
MaMazav 2014-12-17 12:55:52 +02:00
parent dc5961d969
commit c7acbfd901
1 changed files with 24 additions and 6 deletions
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30
src/core/jpx.js
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@ -324,12 +324,6 @@ var JpxImage = (function JpxImageClosure() {
cod.precinctsSizes = precinctsSizes;
}
var unsupported = [];
if (cod.sopMarkerUsed) {
unsupported.push('sopMarkerUsed');
}
if (cod.ephMarkerUsed) {
unsupported.push('ephMarkerUsed');
}
if (cod.selectiveArithmeticCodingBypass) {
unsupported.push('selectiveArithmeticCodingBypass');
}
@ -816,6 +810,21 @@ var JpxImage = (function JpxImageClosure() {
bufferSize -= count;
return (buffer >>> bufferSize) & ((1 << count) - 1);
}
function skipMarkerIfEqual(value) {
if (data[offset + position - 1] === 0xFF &&
data[offset + position] === value) {
skipBytes(1);
return true;
} else if (data[offset + position] === 0xFF &&
data[offset + position + 1] === value) {
skipBytes(2);
return true;
}
return false;
}
function skipBytes(count) {
position += count;
}
function alignToByte() {
bufferSize = 0;
if (skipNextBit) {
@ -843,9 +852,15 @@ var JpxImage = (function JpxImageClosure() {
}
var tileIndex = context.currentTile.index;
var tile = context.tiles[tileIndex];
var sopMarkerUsed = context.COD.sopMarkerUsed;
var ephMarkerUsed = context.COD.ephMarkerUsed;
var packetsIterator = tile.packetsIterator;
while (position < dataLength) {
alignToByte();
if (sopMarkerUsed && skipMarkerIfEqual(0x91)) {
// Skip also marker segment length and packet sequence ID
skipBytes(4);
}
if (!readBits(1)) {
continue;
}
@ -928,6 +943,9 @@ var JpxImage = (function JpxImageClosure() {
});
}
alignToByte();
if (ephMarkerUsed) {
skipMarkerIfEqual(0x92);
}
while (queue.length > 0) {
var packetItem = queue.shift();
codeblock = packetItem.codeblock;