mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-16 16:16:40 +03:00
Joey Parrish
c6ea804e2a
* Drop unnecessary type alternation in SegmentIndex unit tests * Drop unnecessary bind in StreamingEngine unit tests * Drop unnecessary expose annotations in Pssh * Add comments about quoted access in cast unit tests * Move afterAll() position in cast unit tests * Make return type for PublicPromise constructor more specific * Define a type for Util.eventLoop return value Related to PR #421 Change-Id: I092a8ff366b4ac4ea868dd3f4fbe4e3d63a2167f
117 lines
3.2 KiB
JavaScript
117 lines
3.2 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('shaka.log');
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goog.require('shaka.util.DataViewReader');
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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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// Parse the PSSH box.
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var reader = new shaka.util.DataViewReader(
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new DataView(psshBox.buffer),
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shaka.util.DataViewReader.Endianness.BIG_ENDIAN);
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var psshBoxFound = false;
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// There could be multiple boxes concatenated together.
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while (reader.hasMoreData()) {
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var size = shaka.util.Mp4Parser.findBox(shaka.util.Pssh.BOX_TYPE, reader);
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if (size == shaka.util.Mp4Parser.BOX_NOT_FOUND)
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break;
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// a file can have several pssh boxes, mark that at least
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// one was found
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psshBoxFound = true;
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var startPosition = reader.getPosition() - 8;
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var version = reader.readUint8();
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if (version > 1) {
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shaka.log.warning('Unrecognized PSSH version found!');
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reader.skip(size - (reader.getPosition() - startPosition));
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continue;
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}
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reader.skip(3); // Skip flags.
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var systemId = shaka.util.Uint8ArrayUtils.toHex(reader.readBytes(16));
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var keyIds = [];
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if (version > 0) {
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var numKeyIds = reader.readUint32();
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for (var i = 0; i < numKeyIds; ++i) {
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var keyId = shaka.util.Uint8ArrayUtils.toHex(reader.readBytes(16));
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keyIds.push(keyId);
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}
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}
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var dataSize = reader.readUint32();
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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: startPosition,
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end: reader.getPosition() - 1 }
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);
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if (reader.getPosition() != startPosition + size) {
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shaka.log.warning('Mismatch between box size and data size!');
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reader.skip(size - (reader.getPosition() - startPosition));
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}
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}
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if (!psshBoxFound)
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shaka.log.warning('No pssh box found!');
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};
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/** @const {number} */
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shaka.util.Pssh.BOX_TYPE = 0x70737368;
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