mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Jacob Trimble
111 lines
2.9 KiB
JavaScript
111 lines
2.9 KiB
JavaScript
/**
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* @license
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* Copyright 2016 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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goog.provide('shaka.util.Pssh');
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goog.require('goog.asserts');
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goog.require('shaka.log');
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goog.require('shaka.util.Mp4Parser');
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goog.require('shaka.util.Uint8ArrayUtils');
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/**
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* @summary
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* Parse a PSSH box and extract the system IDs.
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*/
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shaka.util.Pssh = class {
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/**
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* @param {!Uint8Array} psshBox
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* @throws {shaka.util.Error} if a PSSH box is truncated or contains a size
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* field over 53 bits.
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*/
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constructor(psshBox) {
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/**
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* In hex.
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* @type {!Array.<string>}
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*/
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this.systemIds = [];
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/**
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* In hex.
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* @type {!Array.<string>}
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*/
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this.cencKeyIds = [];
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/*
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* Array of tuples that define the startIndex + size for each
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* discrete pssh within |psshBox|
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* */
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this.dataBoundaries = [];
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new shaka.util.Mp4Parser()
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.fullBox('pssh', (box) => this.parseBox_(box))
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.parse(psshBox.buffer);
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if (this.dataBoundaries.length == 0) {
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shaka.log.warning('No pssh box found!');
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}
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}
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/**
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* @param {!shaka.extern.ParsedBox} box
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* @private
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*/
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parseBox_(box) {
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goog.asserts.assert(
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box.version != null,
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'PSSH boxes are full boxes and must have a valid version');
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goog.asserts.assert(
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box.flags != null,
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'PSSH boxes are full boxes and must have a valid flag');
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if (box.version > 1) {
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shaka.log.warning('Unrecognized PSSH version found!');
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return;
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}
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const systemId = shaka.util.Uint8ArrayUtils.toHex(box.reader.readBytes(16));
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const keyIds = [];
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if (box.version > 0) {
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const numKeyIds = box.reader.readUint32();
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for (let i = 0; i < numKeyIds; ++i) {
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const keyId =
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shaka.util.Uint8ArrayUtils.toHex(box.reader.readBytes(16));
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keyIds.push(keyId);
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}
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}
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const dataSize = box.reader.readUint32();
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box.reader.skip(dataSize); // Ignore the data section.
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// Now that everything has been succesfully parsed from this box,
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// update member variables.
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this.cencKeyIds.push(...keyIds);
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this.systemIds.push(systemId);
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this.dataBoundaries.push({
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start: box.start,
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end: box.start + box.size - 1,
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});
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if (box.reader.getPosition() != box.reader.getLength()) {
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shaka.log.warning('Mismatch between box size and data size!');
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}
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}
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};
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