rx-player
Version:
Canal+ HTML5 Video Player
68 lines (67 loc) • 2.44 kB
JavaScript
/**
* Copyright 2015 CANAL+ Group
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { be4toi } from "../../../utils/byte_parsing";
import findCompleteBox from "./find_complete_box";
/**
* Take a chunk of ISOBMFF data and extract complete `moof`+`mdat` subsegments
* which are ready to be decoded.
* Returns a tuple of two containing first an array of those subsegments
* followed by the last un-decodable part.
* @param {Uint8Array} buffer
* @returns {Array}
*/
export default function extractCompleteChunks(buffer) {
let _position = 0;
const chunks = [];
let currentBuffer = null;
while (_position <= buffer.length) {
if (_position === buffer.length) {
currentBuffer = null;
break;
}
currentBuffer = buffer.subarray(_position, Infinity);
const moofIndex = findCompleteBox(currentBuffer, 0x6d6f6f66 /* moof */);
if (moofIndex < 0) {
// no moof, not a media segment.
break;
}
const moofLen = be4toi(buffer, moofIndex + _position);
const moofEnd = _position + moofIndex + moofLen;
if (moofEnd > buffer.length) {
// not a complete moof segment
break;
}
const mdatIndex = findCompleteBox(currentBuffer, 0x6d646174 /* mdat */);
if (mdatIndex < 0) {
// no mdat, not a segment.
break;
}
const mdatLen = be4toi(buffer, mdatIndex + _position);
const mdatEnd = _position + mdatIndex + mdatLen;
if (mdatEnd > buffer.length) {
// not a complete mdat segment
break;
}
const maxEnd = Math.max(moofEnd, mdatEnd);
const chunk = buffer.subarray(_position, maxEnd);
chunks.push(chunk);
_position = maxEnd;
}
if (chunks.length === 0) {
return [null, currentBuffer];
}
return [chunks, currentBuffer];
}