mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-16 16:16:40 +03:00
Theodore Abshire
0726543a04
The ParsedBox structure used by the Mp4Parser, previously, had its property names changed in compiled mode. This makes ParsedBox into an extern, so that it will be preserved unchanged in compiled mode. Closes #1522 Change-Id: I0964f8a4b9ccea57c61e2c587a776ed76cfbc8da
107 lines
2.8 KiB
JavaScript
107 lines
2.8 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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* Parse a PSSH box and extract the system IDs.
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*
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* @param {!Uint8Array} psshBox
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* @constructor
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* @struct
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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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shaka.util.Pssh = function(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', this.parseBox_.bind(this)).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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shaka.util.Pssh.prototype.parseBox_ = function(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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let systemId = shaka.util.Uint8ArrayUtils.toHex(box.reader.readBytes(16));
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let keyIds = [];
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if (box.version > 0) {
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let numKeyIds = box.reader.readUint32();
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for (let i = 0; i < numKeyIds; ++i) {
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let keyId = 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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let 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.apply(this.cencKeyIds, 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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