rx-player
Version:
Canal+ HTML5 Video Player
55 lines (54 loc) • 1.71 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, be8toi } from "../../../utils/byte_parsing";
/**
* Find the offset for the first declaration of the given box in an isobmff.
* Returns -1 if not found or if incomplete.
*
* This function does not throw or log in case of partial segments.
* @param {Uint8Array} buf - the isobmff
* @param {Number} wantedName
* @returns {Number} - Offset where the box begins. -1 if not found.
*/
export default function findCompleteBox(buf, wantedName) {
const len = buf.length;
let i = 0;
while (i + 8 <= len) {
let size = be4toi(buf, i);
if (size === 0) {
size = len - i;
}
else if (size === 1) {
if (i + 16 > len) {
return -1;
}
size = be8toi(buf, i + 8);
}
if (isNaN(size) || size <= 0) {
// should not happen
return -1;
}
const name = be4toi(buf, i + 4);
if (name === wantedName) {
if (i + size <= len) {
return i;
}
return -1;
}
i += size;
}
return -1;
}