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stream_utils.js
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/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.util.StreamUtils');
goog.require('goog.asserts');
goog.require('shaka.log');
goog.require('shaka.media.Capabilities');
goog.require('shaka.text.TextEngine');
goog.require('shaka.util.Functional');
goog.require('shaka.util.LanguageUtils');
goog.require('shaka.util.ManifestParserUtils');
goog.require('shaka.util.MimeUtils');
goog.require('shaka.util.MultiMap');
goog.require('shaka.util.ObjectUtils');
goog.require('shaka.util.Platform');
goog.requireType('shaka.media.DrmEngine');
/**
* @summary A set of utility functions for dealing with Streams and Manifests.
* @export
*/
shaka.util.StreamUtils = class {
/**
* In case of multiple usable codecs, choose one based on lowest average
* bandwidth and filter out the rest.
* Also filters out variants that have too many audio channels.
* @param {!shaka.extern.Manifest} manifest
* @param {!Array.<string>} preferredVideoCodecs
* @param {!Array.<string>} preferredAudioCodecs
* @param {!Array.<string>} preferredDecodingAttributes
*/
static chooseCodecsAndFilterManifest(manifest, preferredVideoCodecs,
preferredAudioCodecs, preferredDecodingAttributes) {
const StreamUtils = shaka.util.StreamUtils;
const MimeUtils = shaka.util.MimeUtils;
let variants = manifest.variants;
// To start, choose the codecs based on configured preferences if available.
if (preferredVideoCodecs.length || preferredAudioCodecs.length) {
variants = StreamUtils.choosePreferredCodecs(variants,
preferredVideoCodecs, preferredAudioCodecs);
}
if (preferredDecodingAttributes.length) {
// group variants by resolution and choose preferred variants only
/** @type {!shaka.util.MultiMap.<shaka.extern.Variant>} */
const variantsByResolutionMap = new shaka.util.MultiMap();
for (const variant of variants) {
variantsByResolutionMap
.push(String(variant.video.width || 0), variant);
}
const bestVariants = [];
variantsByResolutionMap.forEach((width, variantsByResolution) => {
let highestMatch = 0;
let matchingVariants = [];
for (const variant of variantsByResolution) {
const matchCount = preferredDecodingAttributes.filter(
(attribute) => variant.decodingInfos[0][attribute],
).length;
if (matchCount > highestMatch) {
highestMatch = matchCount;
matchingVariants = [variant];
} else if (matchCount == highestMatch) {
matchingVariants.push(variant);
}
}
bestVariants.push(...matchingVariants);
});
variants = bestVariants;
}
const audioStreamsSet = new Set();
const videoStreamsSet = new Set();
for (const variant of variants) {
if (variant.audio) {
audioStreamsSet.add(variant.audio);
}
if (variant.video) {
videoStreamsSet.add(variant.video);
}
}
const audioStreams = Array.from(audioStreamsSet).sort((v1, v2) => {
return v1.bandwidth - v2.bandwidth;
});
const validAudioIds = [];
const validAudioStreamsMap = new Map();
const getAudioId = (stream) => {
return stream.language + (stream.channelsCount || 0) +
(stream.audioSamplingRate || 0) + stream.roles.join(',') +
stream.label + stream.groupId + stream.fastSwitching;
};
for (const stream of audioStreams) {
const groupId = getAudioId(stream);
const validAudioStreams = validAudioStreamsMap.get(groupId) || [];
if (!validAudioStreams.length) {
validAudioStreams.push(stream);
validAudioIds.push(stream.id);
} else {
const previousStream = validAudioStreams[validAudioStreams.length - 1];
const previousCodec =
MimeUtils.getNormalizedCodec(previousStream.codecs);
const currentCodec =
MimeUtils.getNormalizedCodec(stream.codecs);
if (previousCodec == currentCodec) {
if (stream.bandwidth > previousStream.bandwidth) {
validAudioStreams.push(stream);
validAudioIds.push(stream.id);
}
}
}
validAudioStreamsMap.set(groupId, validAudioStreams);
}
const videoStreams = Array.from(videoStreamsSet)
.sort((v1, v2) => {
if (!v1.bandwidth || !v2.bandwidth) {
return v1.width - v2.width;
}
return v1.bandwidth - v2.bandwidth;
});
const isChangeTypeSupported =
shaka.media.Capabilities.isChangeTypeSupported();
const validVideoIds = [];
const validVideoStreamsMap = new Map();
const getVideoGroupId = (stream) => {
return Math.round(stream.frameRate || 0) + (stream.hdr || '') +
stream.fastSwitching;
};
for (const stream of videoStreams) {
const groupId = getVideoGroupId(stream);
const validVideoStreams = validVideoStreamsMap.get(groupId) || [];
if (!validVideoStreams.length) {
validVideoStreams.push(stream);
validVideoIds.push(stream.id);
} else {
const previousStream = validVideoStreams[validVideoStreams.length - 1];
if (!isChangeTypeSupported) {
const previousCodec =
MimeUtils.getNormalizedCodec(previousStream.codecs);
const currentCodec =
MimeUtils.getNormalizedCodec(stream.codecs);
if (previousCodec !== currentCodec) {
continue;
}
}
if (stream.width > previousStream.width ||
stream.height > previousStream.height) {
validVideoStreams.push(stream);
validVideoIds.push(stream.id);
} else if (stream.width == previousStream.width &&
stream.height == previousStream.height) {
const previousCodec =
MimeUtils.getNormalizedCodec(previousStream.codecs);
const currentCodec =
MimeUtils.getNormalizedCodec(stream.codecs);
if (previousCodec == currentCodec) {
if (stream.bandwidth > previousStream.bandwidth) {
validVideoStreams.push(stream);
validVideoIds.push(stream.id);
}
}
}
}
validVideoStreamsMap.set(groupId, validVideoStreams);
}
// Filter out any variants that don't match, forcing AbrManager to choose
// from a single video codec and a single audio codec possible.
manifest.variants = manifest.variants.filter((variant) => {
const audio = variant.audio;
const video = variant.video;
if (audio) {
if (!validAudioIds.includes(audio.id)) {
shaka.log.debug('Dropping Variant (better codec available)', variant);
return false;
}
}
if (video) {
if (!validVideoIds.includes(video.id)) {
shaka.log.debug('Dropping Variant (better codec available)', variant);
return false;
}
}
return true;
});
}
/**
* Choose the codecs by configured preferred audio and video codecs.
*
* @param {!Array<shaka.extern.Variant>} variants
* @param {!Array.<string>} preferredVideoCodecs
* @param {!Array.<string>} preferredAudioCodecs
* @return {!Array<shaka.extern.Variant>}
*/
static choosePreferredCodecs(variants, preferredVideoCodecs,
preferredAudioCodecs) {
let subset = variants;
for (const videoCodec of preferredVideoCodecs) {
const filtered = subset.filter((variant) => {
return variant.video && variant.video.codecs.startsWith(videoCodec);
});
if (filtered.length) {
subset = filtered;
break;
}
}
for (const audioCodec of preferredAudioCodecs) {
const filtered = subset.filter((variant) => {
return variant.audio && variant.audio.codecs.startsWith(audioCodec);
});
if (filtered.length) {
subset = filtered;
break;
}
}
return subset;
}
/**
* Filter the variants in |manifest| to only include the variants that meet
* the given restrictions.
*
* @param {!shaka.extern.Manifest} manifest
* @param {shaka.extern.Restrictions} restrictions
* @param {{width: number, height:number}} maxHwResolution
*/
static filterByRestrictions(manifest, restrictions, maxHwResolution) {
manifest.variants = manifest.variants.filter((variant) => {
return shaka.util.StreamUtils.meetsRestrictions(
variant, restrictions, maxHwResolution);
});
}
/**
* @param {shaka.extern.Variant} variant
* @param {shaka.extern.Restrictions} restrictions
* Configured restrictions from the user.
* @param {{width: number, height: number}} maxHwRes
* The maximum resolution the hardware can handle.
* This is applied separately from user restrictions because the setting
* should not be easily replaced by the user's configuration.
* @return {boolean}
* @export
*/
static meetsRestrictions(variant, restrictions, maxHwRes) {
/** @type {function(number, number, number):boolean} */
const inRange = (x, min, max) => {
return x >= min && x <= max;
};
const video = variant.video;
// |video.width| and |video.height| can be undefined, which breaks
// the math, so make sure they are there first.
if (video && video.width && video.height) {
let videoWidth = video.width;
let videoHeight = video.height;
if (videoHeight > videoWidth) {
// Vertical video.
[videoWidth, videoHeight] = [videoHeight, videoWidth];
}
if (!inRange(videoWidth,
restrictions.minWidth,
Math.min(restrictions.maxWidth, maxHwRes.width))) {
return false;
}
if (!inRange(videoHeight,
restrictions.minHeight,
Math.min(restrictions.maxHeight, maxHwRes.height))) {
return false;
}
if (!inRange(video.width * video.height,
restrictions.minPixels,
restrictions.maxPixels)) {
return false;
}
}
// |variant.frameRate| can be undefined, which breaks
// the math, so make sure they are there first.
if (variant && variant.video && variant.video.frameRate) {
if (!inRange(variant.video.frameRate,
restrictions.minFrameRate,
restrictions.maxFrameRate)) {
return false;
}
}
if (!inRange(variant.bandwidth,
restrictions.minBandwidth,
restrictions.maxBandwidth)) {
return false;
}
return true;
}
/**
* @param {!Array.<shaka.extern.Variant>} variants
* @param {shaka.extern.Restrictions} restrictions
* @param {{width: number, height: number}} maxHwRes
* @return {boolean} Whether the tracks changed.
*/
static applyRestrictions(variants, restrictions, maxHwRes) {
let tracksChanged = false;
for (const variant of variants) {
const originalAllowed = variant.allowedByApplication;
variant.allowedByApplication = shaka.util.StreamUtils.meetsRestrictions(
variant, restrictions, maxHwRes);
if (originalAllowed != variant.allowedByApplication) {
tracksChanged = true;
}
}
return tracksChanged;
}
/**
* Alters the given Manifest to filter out any unplayable streams.
*
* @param {shaka.media.DrmEngine} drmEngine
* @param {shaka.extern.Manifest} manifest
*/
static async filterManifest(drmEngine, manifest) {
await shaka.util.StreamUtils.filterManifestByMediaCapabilities(
drmEngine, manifest, manifest.offlineSessionIds.length > 0);
shaka.util.StreamUtils.filterTextStreams_(manifest);
await shaka.util.StreamUtils.filterImageStreams_(manifest);
}
/**
* Alters the given Manifest to filter out any streams unsupported by the
* platform via MediaCapabilities.decodingInfo() API.
*
* @param {shaka.media.DrmEngine} drmEngine
* @param {shaka.extern.Manifest} manifest
* @param {boolean} usePersistentLicenses
*/
static async filterManifestByMediaCapabilities(
drmEngine, manifest, usePersistentLicenses) {
goog.asserts.assert(navigator.mediaCapabilities,
'MediaCapabilities should be valid.');
await shaka.util.StreamUtils.getDecodingInfosForVariants(
manifest.variants, usePersistentLicenses, /* srcEquals= */ false,
/** preferredKeySystems= */ []);
let keySystem = null;
if (drmEngine) {
const drmInfo = drmEngine.getDrmInfo();
if (drmInfo) {
keySystem = drmInfo.keySystem;
}
}
const ContentType = shaka.util.ManifestParserUtils.ContentType;
const Capabilities = shaka.media.Capabilities;
const ManifestParserUtils = shaka.util.ManifestParserUtils;
const MimeUtils = shaka.util.MimeUtils;
const StreamUtils = shaka.util.StreamUtils;
const isXboxOne = shaka.util.Platform.isXboxOne();
const isFirefoxAndroid = shaka.util.Platform.isFirefox() &&
shaka.util.Platform.isAndroid();
manifest.variants = manifest.variants.filter((variant) => {
// See: https://github.com/shaka-project/shaka-player/issues/3860
const video = variant.video;
const videoWidth = (video && video.width) || 0;
const videoHeight = (video && video.height) || 0;
// See: https://github.com/shaka-project/shaka-player/issues/3380
// Note: it makes sense to drop early
if (isXboxOne && video &&
(videoWidth > 1920 || videoHeight > 1080) &&
(video.codecs.includes('avc1.') || video.codecs.includes('avc3.'))
) {
shaka.log.debug('Dropping variant - not compatible with platform',
StreamUtils.getVariantSummaryString_(variant));
return false;
}
if (video) {
let videoCodecs = StreamUtils.getCorrectVideoCodecs_(video.codecs);
// For multiplexed streams. Here we must check the audio of the
// stream to see if it is compatible.
if (video.codecs.includes(',')) {
const allCodecs = video.codecs.split(',');
videoCodecs = ManifestParserUtils.guessCodecs(
ContentType.VIDEO, allCodecs);
videoCodecs = StreamUtils.getCorrectVideoCodecs_(videoCodecs);
let audioCodecs = ManifestParserUtils.guessCodecs(
ContentType.AUDIO, allCodecs);
audioCodecs = StreamUtils.getCorrectAudioCodecs_(audioCodecs);
const audioFullType = MimeUtils.getFullOrConvertedType(
video.mimeType, audioCodecs, ContentType.AUDIO);
if (!Capabilities.isTypeSupported(audioFullType)) {
return false;
}
// Update the codec string with the (possibly) converted codecs.
videoCodecs = [videoCodecs, audioCodecs].join(',');
}
const fullType = MimeUtils.getFullOrConvertedType(
video.mimeType, videoCodecs, ContentType.VIDEO);
if (!Capabilities.isTypeSupported(fullType)) {
return false;
}
// Update the codec string with the (possibly) converted codecs.
video.codecs = videoCodecs;
}
const audio = variant.audio;
// See: https://github.com/shaka-project/shaka-player/issues/6111
// It seems that Firefox Android reports that it supports
// Opus + Widevine, but it is not actually supported.
// It makes sense to drop early.
if (isFirefoxAndroid && audio && audio.encrypted &&
audio.codecs.toLowerCase().includes('opus')) {
shaka.log.debug('Dropping variant - not compatible with platform',
StreamUtils.getVariantSummaryString_(variant));
return false;
}
if (audio) {
const codecs = StreamUtils.getCorrectAudioCodecs_(audio.codecs);
const fullType = MimeUtils.getFullOrConvertedType(
audio.mimeType, codecs, ContentType.AUDIO);
if (!Capabilities.isTypeSupported(fullType)) {
return false;
}
// Update the codec string with the (possibly) converted codecs.
audio.codecs = codecs;
}
const supported = variant.decodingInfos.some((decodingInfo) => {
if (!decodingInfo.supported) {
return false;
}
if (keySystem) {
const keySystemAccess = decodingInfo.keySystemAccess;
if (keySystemAccess) {
if (keySystemAccess.keySystem != keySystem) {
return false;
}
}
}
return true;
});
// Filter out all unsupported variants.
if (!supported) {
shaka.log.debug('Dropping variant - not compatible with platform',
StreamUtils.getVariantSummaryString_(variant));
}
return supported;
});
}
/**
* Constructs a string out of an object, similar to the JSON.stringify method.
* Unlike that method, this guarantees that the order of the keys is
* alphabetical, so it can be used as a way to reliably compare two objects.
*
* @param {!Object} obj
* @return {string}
* @private
*/
static alphabeticalKeyOrderStringify_(obj) {
const keys = [];
for (const key in obj) {
keys.push(key);
}
// Alphabetically sort the keys, so they will be in a reliable order.
keys.sort();
const terms = [];
for (const key of keys) {
const escapedKey = JSON.stringify(key);
const value = obj[key];
if (value instanceof Object) {
const stringifiedValue =
shaka.util.StreamUtils.alphabeticalKeyOrderStringify_(value);
terms.push(escapedKey + ':' + stringifiedValue);
} else {
const escapedValue = JSON.stringify(value);
terms.push(escapedKey + ':' + escapedValue);
}
}
return '{' + terms.join(',') + '}';
}
/**
* Queries mediaCapabilities for the decoding info for that decoding config,
* and assigns it to the given variant.
* If that query has been done before, instead return a cached result.
* @param {!shaka.extern.Variant} variant
* @param {!MediaDecodingConfiguration} decodingConfig
* @private
*/
static async getDecodingInfosForVariant_(variant, decodingConfig) {
const cacheKey =
shaka.util.StreamUtils.alphabeticalKeyOrderStringify_(decodingConfig);
const cache = shaka.util.StreamUtils.decodingConfigCache_;
if (cache[cacheKey]) {
shaka.log.v2('Using cached results of mediaCapabilities.decodingInfo',
'for key', cacheKey);
variant.decodingInfos.push(cache[cacheKey]);
} else {
// Do a final pass-over of the decoding config: if a given stream has
// multiple codecs, that suggests that it switches between those codecs
// at points of the go-through.
// mediaCapabilities by itself will report "not supported" when you
// put in multiple different codecs, so each has to be checked
// individually. So check each and take the worst result, to determine
// overall variant compatibility.
const results = await shaka.util.StreamUtils
.checkEachDecodingConfigCombination_(decodingConfig);
if (results && results.length) {
/** @type {?MediaCapabilitiesDecodingInfo} */
let overallResult = null;
for (const result of results) {
if (!overallResult) {
overallResult = result;
} else {
overallResult.supported =
overallResult.supported && result.supported;
overallResult.powerEfficient =
overallResult.powerEfficient && result.powerEfficient;
overallResult.smooth = overallResult.smooth && result.smooth;
if (!result.keySystemAccess) {
overallResult.keySystemAccess = null;
}
}
}
if (overallResult) {
cache[cacheKey] = overallResult;
variant.decodingInfos.push(overallResult);
}
}
}
}
/**
* @param {!MediaDecodingConfiguration} decodingConfig
* @return {!Promise.<?Array.<!MediaCapabilitiesDecodingInfo>>}
* @private
*/
static checkEachDecodingConfigCombination_(decodingConfig) {
let videoCodecs = [''];
if (decodingConfig.video) {
videoCodecs = shaka.util.MimeUtils.getCodecs(
decodingConfig.video.contentType).split(',');
}
let audioCodecs = [''];
if (decodingConfig.audio) {
audioCodecs = shaka.util.MimeUtils.getCodecs(
decodingConfig.audio.contentType).split(',');
}
const promises = [];
for (const videoCodec of videoCodecs) {
for (const audioCodec of audioCodecs) {
const copy = shaka.util.ObjectUtils.cloneObject(decodingConfig);
if (decodingConfig.video) {
const mimeType = shaka.util.MimeUtils.getBasicType(
copy.video.contentType);
copy.video.contentType = shaka.util.MimeUtils.getFullType(
mimeType, videoCodec);
}
if (decodingConfig.audio) {
const mimeType = shaka.util.MimeUtils.getBasicType(
copy.audio.contentType);
copy.audio.contentType = shaka.util.MimeUtils.getFullType(
mimeType, audioCodec);
}
promises.push(new Promise((resolve, reject) => {
navigator.mediaCapabilities.decodingInfo(copy).then((res) => {
resolve(res);
}).catch(reject);
}));
}
}
return Promise.all(promises).catch((e) => {
shaka.log.info('MediaCapabilities.decodingInfo() failed.',
JSON.stringify(decodingConfig), e);
return null;
});
}
/**
* Get the decodingInfo results of the variants via MediaCapabilities.
* This should be called after the DrmEngine is created and configured, and
* before DrmEngine sets the mediaKeys.
*
* @param {!Array.<shaka.extern.Variant>} variants
* @param {boolean} usePersistentLicenses
* @param {boolean} srcEquals
* @param {!Array<string>} preferredKeySystems
* @exportDoc
*/
static async getDecodingInfosForVariants(variants, usePersistentLicenses,
srcEquals, preferredKeySystems) {
const gotDecodingInfo = variants.some((variant) =>
variant.decodingInfos.length);
if (gotDecodingInfo) {
shaka.log.debug('Already got the variants\' decodingInfo.');
return;
}
// Try to get preferred key systems first to avoid unneeded calls to CDM.
for (const preferredKeySystem of preferredKeySystems) {
let keySystemSatisfied = false;
for (const variant of variants) {
/** @type {!Array.<!MediaDecodingConfiguration>} */
const decodingConfigs = shaka.util.StreamUtils.getDecodingConfigs_(
variant, usePersistentLicenses, srcEquals)
.filter((config) => {
const keySystem = config.keySystemConfiguration &&
config.keySystemConfiguration.keySystem;
return keySystem === preferredKeySystem;
});
// The reason we are performing this await in a loop rather than
// batching into a `promise.all` is performance related.
// https://github.com/shaka-project/shaka-player/pull/4708#discussion_r1022581178
for (const config of decodingConfigs) {
// eslint-disable-next-line no-await-in-loop
await shaka.util.StreamUtils.getDecodingInfosForVariant_(
variant, config);
}
if (variant.decodingInfos.length) {
keySystemSatisfied = true;
}
} // for (const variant of variants)
if (keySystemSatisfied) {
// Return if any preferred key system is already satisfied.
return;
}
} // for (const preferredKeySystem of preferredKeySystems)
for (const variant of variants) {
/** @type {!Array.<!MediaDecodingConfiguration>} */
const decodingConfigs = shaka.util.StreamUtils.getDecodingConfigs_(
variant, usePersistentLicenses, srcEquals)
.filter((config) => {
const keySystem = config.keySystemConfiguration &&
config.keySystemConfiguration.keySystem;
// Avoid checking preferred systems twice.
return !keySystem || !preferredKeySystems.includes(keySystem);
});
// The reason we are performing this await in a loop rather than
// batching into a `promise.all` is performance related.
// https://github.com/shaka-project/shaka-player/pull/4708#discussion_r1022581178
for (const config of decodingConfigs) {
// eslint-disable-next-line no-await-in-loop
await shaka.util.StreamUtils.getDecodingInfosForVariant_(
variant, config);
}
}
}
/**
* Generate a MediaDecodingConfiguration object to get the decodingInfo
* results for each variant.
* @param {!shaka.extern.Variant} variant
* @param {boolean} usePersistentLicenses
* @param {boolean} srcEquals
* @return {!Array.<!MediaDecodingConfiguration>}
* @private
*/
static getDecodingConfigs_(variant, usePersistentLicenses, srcEquals) {
const audio = variant.audio;
const video = variant.video;
const ContentType = shaka.util.ManifestParserUtils.ContentType;
const ManifestParserUtils = shaka.util.ManifestParserUtils;
const MimeUtils = shaka.util.MimeUtils;
const StreamUtils = shaka.util.StreamUtils;
/** @type {!MediaDecodingConfiguration} */
const mediaDecodingConfig = {
type: srcEquals ? 'file' : 'media-source',
};
if (video) {
let videoCodecs = video.codecs;
// For multiplexed streams with audio+video codecs, the config should have
// AudioConfiguration and VideoConfiguration.
if (video.codecs.includes(',')) {
const allCodecs = video.codecs.split(',');
videoCodecs = ManifestParserUtils.guessCodecs(
ContentType.VIDEO, allCodecs);
videoCodecs = StreamUtils.getCorrectVideoCodecs_(videoCodecs);
let audioCodecs = ManifestParserUtils.guessCodecs(
ContentType.AUDIO, allCodecs);
audioCodecs = StreamUtils.getCorrectAudioCodecs_(audioCodecs);
const audioFullType = MimeUtils.getFullOrConvertedType(
video.mimeType, audioCodecs, ContentType.AUDIO);
mediaDecodingConfig.audio = {
contentType: audioFullType,
channels: 2,
bitrate: variant.bandwidth || 1,
samplerate: 1,
spatialRendering: false,
};
}
videoCodecs = StreamUtils.getCorrectVideoCodecs_(videoCodecs);
const fullType = MimeUtils.getFullOrConvertedType(
video.mimeType, videoCodecs, ContentType.VIDEO);
// VideoConfiguration
mediaDecodingConfig.video = {
contentType: fullType,
// NOTE: Some decoders strictly check the width and height fields and
// won't decode smaller than 64x64. So if we don't have this info (as
// is the case in some of our simpler tests), assume a 64x64 resolution
// to fill in this required field for MediaCapabilities.
//
// This became an issue specifically on Firefox on M1 Macs.
width: video.width || 64,
height: video.height || 64,
bitrate: video.bandwidth || variant.bandwidth || 1,
// framerate must be greater than 0, otherwise the config is invalid.
framerate: video.frameRate || 1,
};
if (video.hdr) {
switch (video.hdr) {
case 'SDR':
mediaDecodingConfig.video.transferFunction = 'srgb';
break;
case 'PQ':
mediaDecodingConfig.video.transferFunction = 'pq';
break;
case 'HLG':
mediaDecodingConfig.video.transferFunction = 'hlg';
break;
}
}
}
if (audio) {
const codecs = StreamUtils.getCorrectAudioCodecs_(audio.codecs);
const fullType = MimeUtils.getFullOrConvertedType(
audio.mimeType, codecs, ContentType.AUDIO);
// AudioConfiguration
mediaDecodingConfig.audio = {
contentType: fullType,
channels: audio.channelsCount || 2,
bitrate: audio.bandwidth || variant.bandwidth || 1,
samplerate: audio.audioSamplingRate || 1,
spatialRendering: audio.spatialAudio,
};
}
const videoDrmInfos = variant.video ? variant.video.drmInfos : [];
const audioDrmInfos = variant.audio ? variant.audio.drmInfos : [];
const allDrmInfos = videoDrmInfos.concat(audioDrmInfos);
// Return a list containing the mediaDecodingConfig for unencrypted variant.
if (!allDrmInfos.length) {
return [mediaDecodingConfig];
}
// A list of MediaDecodingConfiguration objects created for the variant.
const configs = [];
// Get all the drm info so that we can avoid using nested loops when we
// just need the drm info.
const drmInfoByKeySystems = new Map();
for (const info of allDrmInfos) {
if (!drmInfoByKeySystems.get(info.keySystem)) {
drmInfoByKeySystems.set(info.keySystem, []);
}
drmInfoByKeySystems.get(info.keySystem).push(info);
}
const persistentState =
usePersistentLicenses ? 'required' : 'optional';
const sessionTypes =
usePersistentLicenses ? ['persistent-license'] : ['temporary'];
for (const keySystem of drmInfoByKeySystems.keys()) {
// Create a copy of the mediaDecodingConfig.
const config = /** @type {!MediaDecodingConfiguration} */
(Object.assign({}, mediaDecodingConfig));
const drmInfos = drmInfoByKeySystems.get(keySystem);
/** @type {!MediaCapabilitiesKeySystemConfiguration} */
const keySystemConfig = {
keySystem: keySystem,
initDataType: 'cenc',
persistentState: persistentState,
distinctiveIdentifier: 'optional',
sessionTypes: sessionTypes,
};
for (const info of drmInfos) {
if (info.initData && info.initData.length) {
const initDataTypes = new Set();
for (const initData of info.initData) {
initDataTypes.add(initData.initDataType);
}
if (initDataTypes.size > 1) {
shaka.log.v2('DrmInfo contains more than one initDataType,',
'and we use the initDataType of the first initData.',
info);
}
keySystemConfig.initDataType = info.initData[0].initDataType;
}
if (info.distinctiveIdentifierRequired) {
keySystemConfig.distinctiveIdentifier = 'required';
}
if (info.persistentStateRequired) {
keySystemConfig.persistentState = 'required';
}
if (info.sessionType) {
keySystemConfig.sessionTypes = [info.sessionType];
}
if (audio) {
// See: https://github.com/shaka-project/shaka-player/issues/4659
if (info.audioRobustness != '') {
if (!keySystemConfig.audio) {
// KeySystemTrackConfiguration
keySystemConfig.audio = {
robustness: info.audioRobustness,
};
} else {
keySystemConfig.audio.robustness =
keySystemConfig.audio.robustness || info.audioRobustness;
}
} else if (!keySystemConfig.audio) {
// KeySystemTrackConfiguration
keySystemConfig.audio = {};
}
}
if (video) {
// See: https://github.com/shaka-project/shaka-player/issues/4659
if (info.videoRobustness != '') {
if (!keySystemConfig.video) {
// KeySystemTrackConfiguration
keySystemConfig.video = {
robustness: info.videoRobustness,
};
} else {
keySystemConfig.video.robustness =
keySystemConfig.video.robustness || info.videoRobustness;
}
} else if (!keySystemConfig.video) {
// KeySystemTrackConfiguration
keySystemConfig.video = {};
}
}
}
config.keySystemConfiguration = keySystemConfig;
configs.push(config);
}
return configs;
}
/**
* Generates the correct audio codec for MediaDecodingConfiguration and
* for MediaSource.isTypeSupported.
* @param {string} codecs
* @return {string}
* @private
*/
static getCorrectAudioCodecs_(codecs) {
// According to RFC 6381 section 3.3, 'fLaC' is actually the correct
// codec string. We still need to map it to 'flac', as some browsers
// currently don't support 'fLaC', while 'flac' is supported by most
// major browsers.
// See https://bugs.chromium.org/p/chromium/issues/detail?id=1422728
if (codecs === 'fLaC' && !shaka.util.Platform.isSafari()) {
return 'flac';
}
// The same is true for 'Opus'.
if (codecs === 'Opus') {
return 'opus';
}
return codecs;
}
/**
* Generates the correct video codec for MediaDecodingConfiguration and
* for MediaSource.isTypeSupported.
* @param {string} codec
* @return {string}
* @private
*/
static getCorrectVideoCodecs_(codec) {
if (codec.includes('avc1')) {
// Convert avc1 codec string from RFC-4281 to RFC-6381 for
// MediaSource.isTypeSupported
// Example, convert avc1.66.30 to avc1.42001e (0x42 == 66 and 0x1e == 30)
const avcdata = codec.split('.');
if (avcdata.length == 3) {
let result = avcdata.shift() + '.';
result += parseInt(avcdata.shift(), 10).toString(16);
result +=
('000' + parseInt(avcdata.shift(), 10).toString(16)).slice(-4);
return result;
}
} else if (codec == 'vp9') {
// MediaCapabilities supports 'vp09...' codecs, but not 'vp9'. Translate
// vp9 codec strings into 'vp09...', to allow such content to play with
// mediaCapabilities enabled.
// This means profile 0, level 4.1, 8-bit color. This supports 1080p @
// 60Hz. See https://en.wikipedia.org/wiki/VP9#Levels
//
// If we don't have more detailed codec info, assume this profile and
// level because it's high enough to likely accommodate the parameters we
// do have, such as width and height. If an implementation is checking
// the profile and level very strictly, we want older VP9 content to
// still work to some degree. But we don't want to set a level so high
// that it is rejected by a hardware decoder that can't handle the
// maximum requirements of the level.
//
// This became an issue specifically on Firefox on M1 Macs.
return 'vp09.00.41.08';
}
return codec;
}
/**
* Alters the given Manifest to filter out any streams uncompatible with the
* current variant.
*
* @param {?shaka.extern.Variant} currentVariant
* @param {shaka.extern.Manifest} manifest
*/
static filterManifestByCurrentVariant(currentVariant, manifest) {
const StreamUtils = shaka.util.StreamUtils;
manifest.variants = manifest.variants.filter((variant) => {
const audio = variant.audio;
const video = variant.video;
if (audio && currentVariant && currentVariant.audio) {
if (!StreamUtils.areStreamsCompatible_(audio, currentVariant.audio)) {
shaka.log.debug('Dropping variant - not compatible with active audio',
'active audio',
StreamUtils.getStreamSummaryString_(currentVariant.audio),
'variant.audio',
StreamUtils.getStreamSummaryString_(audio));
return false;
}
}
if (video && currentVariant && currentVariant.video) {
if (!StreamUtils.areStreamsCompatible_(video, currentVariant.video)) {
shaka.log.debug('Dropping variant - not compatible with active video',
'active video',
StreamUtils.getStreamSummaryString_(currentVariant.video),