shaka-player
Version:
DASH/EME video player library
343 lines (299 loc) • 9.21 kB
JavaScript
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.util.ManifestParserUtils');
goog.require('goog.Uri');
goog.require('shaka.util.BufferUtils');
goog.require('shaka.util.Error');
goog.require('shaka.util.StringUtils');
goog.require('shaka.util.Uint8ArrayUtils');
/**
* @summary Utility functions for manifest parsing.
*/
shaka.util.ManifestParserUtils = class {
/**
* Resolves an array of relative URIs to the given base URIs. This will result
* in M*N number of URIs.
*
* Note: This method is slow in SmartTVs and Consoles. It should only be
* called when necessary.
*
* @param {!Array<string>} baseUris
* @param {!Array<string>} relativeUris
* @param {string=} extraQueryParams
* @return {!Array<string>}
*/
static resolveUris(baseUris, relativeUris, extraQueryParams = '') {
if (relativeUris.length == 0) {
return baseUris;
}
if (baseUris.length == 1 && relativeUris.length == 1) {
const baseUri = new goog.Uri(baseUris[0]);
const relativeUri = new goog.Uri(relativeUris[0]);
const resolvedUri = baseUri.resolve(relativeUri);
if (extraQueryParams) {
resolvedUri.setQueryData(extraQueryParams);
}
return [resolvedUri.toString()];
}
const relativeAsGoog = relativeUris.map((uri) => new goog.Uri(uri));
// For each base URI, this code resolves it with every relative URI.
// The result is a single array containing all the resolved URIs.
const resolvedUris = [];
for (const baseStr of baseUris) {
const base = new goog.Uri(baseStr);
for (const relative of relativeAsGoog) {
const resolvedUri = base.resolve(relative);
if (extraQueryParams) {
resolvedUri.setQueryData(extraQueryParams);
}
resolvedUris.push(resolvedUri.toString());
}
}
return resolvedUris;
}
/**
* Creates a DrmInfo object from the given info.
*
* @param {string} keySystem
* @param {string} encryptionScheme
* @param {Array<shaka.extern.InitDataOverride>} initData
* @param {string} [keySystemUri]
* @return {shaka.extern.DrmInfo}
*/
static createDrmInfo(keySystem, encryptionScheme, initData, keySystemUri) {
const drmInfo = {
keySystem,
encryptionScheme,
licenseServerUri: '',
distinctiveIdentifierRequired: false,
persistentStateRequired: false,
audioRobustness: '',
videoRobustness: '',
serverCertificate: null,
serverCertificateUri: '',
sessionType: '',
initData: initData || [],
keyIds: new Set(),
};
if (keySystemUri) {
drmInfo.keySystemUris = new Set([keySystemUri]);
}
return drmInfo;
}
/**
* Creates a DrmInfo object from ClearKeys.
*
* @param {!Map<string, string>} clearKeys
* @param {string=} encryptionScheme
* @return {shaka.extern.DrmInfo}
*/
static createDrmInfoFromClearKeys(clearKeys, encryptionScheme = 'cenc') {
const StringUtils = shaka.util.StringUtils;
const Uint8ArrayUtils = shaka.util.Uint8ArrayUtils;
const keys = [];
const keyIds = [];
const originalKeyIds = [];
clearKeys.forEach((key, keyId) => {
let kid = keyId;
if (kid.length != 22) {
kid = Uint8ArrayUtils.toBase64(
Uint8ArrayUtils.fromHex(keyId), false);
}
let k = key;
if (k.length != 22) {
k = Uint8ArrayUtils.toBase64(
Uint8ArrayUtils.fromHex(key), false);
}
const keyObj = {
kty: 'oct',
kid: kid,
k: k,
};
keys.push(keyObj);
keyIds.push(keyObj.kid);
originalKeyIds.push(keyId);
});
const jwkSet = {keys: keys};
const license = JSON.stringify(jwkSet);
// Use the keyids init data since is suggested by EME.
// Suggestion: https://bit.ly/2JYcNTu
// Format: https://www.w3.org/TR/eme-initdata-keyids/
const initDataStr = JSON.stringify({'kids': keyIds});
const initData =
shaka.util.BufferUtils.toUint8(StringUtils.toUTF8(initDataStr));
const initDatas = [{initData: initData, initDataType: 'keyids'}];
return {
keySystem: 'org.w3.clearkey',
encryptionScheme,
licenseServerUri: 'data:application/json;base64,' + window.btoa(license),
distinctiveIdentifierRequired: false,
persistentStateRequired: false,
audioRobustness: '',
videoRobustness: '',
serverCertificate: null,
serverCertificateUri: '',
sessionType: '',
initData: initDatas,
keyIds: new Set(originalKeyIds),
};
}
/**
* Attempts to guess which codecs from the codecs list belong to a given
* content type.
* Assumes that at least one codec is correct, and throws if none are.
*
* @param {string} contentType
* @param {!Array<string>} codecs
* @return {string}
*/
static guessCodecs(contentType, codecs) {
if (codecs.length == 1) {
return codecs[0];
}
const match = shaka.util.ManifestParserUtils.guessCodecsSafe(
contentType, codecs);
// A failure is specifically denoted by null; an empty string represents a
// valid match of no codec.
if (match != null) {
return match;
}
// Unable to guess codecs.
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.HLS_COULD_NOT_GUESS_CODECS,
codecs);
}
/**
* Attempts to guess which codecs from the codecs list belong to a given
* content type. Does not assume a single codec is anything special, and does
* not throw if it fails to match.
*
* @param {string} contentType
* @param {!Array<string>} codecs
* @return {?string} or null if no match is found
*/
static guessCodecsSafe(contentType, codecs) {
const formats = shaka.util.ManifestParserUtils
.CODEC_REGEXPS_BY_CONTENT_TYPE_.get(contentType);
for (const format of formats) {
for (const codec of codecs) {
if (format.test(codec.trim())) {
return codec.trim();
}
}
}
// Text does not require a codec string.
if (contentType == shaka.util.ManifestParserUtils.ContentType.TEXT) {
return '';
}
return null;
}
/**
* Attempts to guess which codecs from the codecs list belong to a given
* content.
*
* @param {string} contentType
* @param {!Array<string>} codecs
* @return {!Array<string>}
*/
static guessAllCodecsSafe(contentType, codecs) {
const allCodecs = [];
const formats = shaka.util.ManifestParserUtils
.CODEC_REGEXPS_BY_CONTENT_TYPE_.get(contentType);
for (const format of formats) {
for (const codec of codecs) {
if (format.test(codec.trim())) {
allCodecs.push(codec.trim());
}
}
}
return allCodecs;
}
};
/**
* @enum {string}
*/
shaka.util.ManifestParserUtils.ContentType = {
VIDEO: 'video',
AUDIO: 'audio',
TEXT: 'text',
IMAGE: 'image',
APPLICATION: 'application',
};
/**
* @enum {string}
*/
shaka.util.ManifestParserUtils.TextStreamKind = {
SUBTITLE: 'subtitle',
CLOSED_CAPTION: 'caption',
};
/**
* Specifies how tolerant the player is of inaccurate segment start times and
* end times within a manifest. For example, gaps or overlaps between segments
* in a SegmentTimeline which are greater than or equal to this value will
* result in a warning message.
*
* @const {number}
*/
shaka.util.ManifestParserUtils.GAP_OVERLAP_TOLERANCE_SECONDS = 1 / 15;
/**
* A list of regexps to detect well-known video codecs.
*
* @const {!Array<!RegExp>}
* @private
*/
shaka.util.ManifestParserUtils.VIDEO_CODEC_REGEXPS_ = [
/^avc/,
/^hev/,
/^hvc/,
/^vvc/,
/^vvi/,
/^vp0?[89]/,
/^av01/,
/^dvh/, // Dolby Vision based in HEVC
/^dva/, // Dolby Vision based in AVC
/^dav/, // Dolby Vision based in AV1
];
/**
* A list of regexps to detect well-known audio codecs.
*
* @const {!Array<!RegExp>}
* @private
*/
shaka.util.ManifestParserUtils.AUDIO_CODEC_REGEXPS_ = [
/^vorbis$/,
/^Opus$/, // correct codec string according to RFC 6381 section 3.3
/^opus$/, // some manifests wrongfully use this
/^fLaC$/, // correct codec string according to RFC 6381 section 3.3
/^flac$/, // some manifests wrongfully use this
/^mp4a/,
/^[ae]c-3$/,
/^ac-4/,
/^dts[cex]$/, // DTS Digital Surround (dtsc), DTS Express (dtse), DTS:X (dtsx)
/^iamf/,
/^mhm[12]/, // MPEG-H Audio LC
/^ac3$/, // sometimes ac3 is used instead of ac-3
/^eac3$/, // sometimes "eac3" is used instead of "ec-3"
];
/**
* A list of regexps to detect well-known text codecs.
*
* @const {!Array<!RegExp>}
* @private
*/
shaka.util.ManifestParserUtils.TEXT_CODEC_REGEXPS_ = [
/^vtt$/,
/^wvtt/,
/^stpp/,
];
/**
* @const {!Map<string, !Array<!RegExp>>}
*/
shaka.util.ManifestParserUtils.CODEC_REGEXPS_BY_CONTENT_TYPE_ = new Map()
.set('audio', shaka.util.ManifestParserUtils.AUDIO_CODEC_REGEXPS_)
.set('video', shaka.util.ManifestParserUtils.VIDEO_CODEC_REGEXPS_)
.set('text', shaka.util.ManifestParserUtils.TEXT_CODEC_REGEXPS_);