mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-14 15:56:38 +03:00
Joey Parrish
08bdb3079b
Includes unit tests and covers zero-sized PSSHs, truncated PSSHs, and various orderings of both v0 and v1 PSSHs. Change-Id: I79ecc9475d483be610c003b57e831954a1c9800b
116 lines
3.3 KiB
JavaScript
116 lines
3.3 KiB
JavaScript
/**
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* Copyright 2014 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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* @fileoverview Implements a PSSH parser.
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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.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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* @throws {RangeError} in the unlikely event that a PSSH box 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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* @expose
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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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* @expose
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*/
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this.cencKeyIds = [];
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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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// There could be multiple boxes concatenated together.
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// If any of them throws, keep the data parsed from the earlier ones.
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try {
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while (reader.hasMoreData()) {
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var startPosition = reader.getPosition();
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var size = reader.readUint32();
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var type = reader.readUint32();
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if (size == 1) {
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size = reader.readUint64();
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} else if (size == 0) {
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size = reader.getLength() - startPosition;
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}
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if (type != shaka.util.Pssh.BOX_TYPE) {
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shaka.log.warning('Non-PSSH box found!');
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reader.skip(size - (reader.getPosition() - startPosition));
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continue;
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}
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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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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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} catch (exception) {
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shaka.log.warning('PSSH parse failure! Some data may be missing or ' +
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'incorrect.');
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}
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};
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/** @const {number} */
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shaka.util.Pssh.BOX_TYPE = 0x70737368;
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