shaka-player
Version:
DASH/EME video player library
1,537 lines (1,367 loc) • 54.9 kB
JavaScript
/*! @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.config.CodecSwitchingStrategy');
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.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 {number} preferredAudioChannelCount
* @param {!Array.<string>} preferredDecodingAttributes
*/
static chooseCodecsAndFilterManifest(manifest, preferredVideoCodecs,
preferredAudioCodecs, preferredAudioChannelCount,
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;
}
if (preferredAudioChannelCount) {
variants = StreamUtils.filterVariantsByAudioChannelCount(
variants, preferredAudioChannelCount);
}
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 audioStreamsMap = new Map();
const getAudioId = (stream) => {
return stream.language + (stream.channelsCount || 0) +
stream.roles.join(',') + stream.label;
};
for (const stream of audioStreams) {
const id = getAudioId(stream);
if (!audioStreamsMap.has(id)) {
audioStreamsMap.set(id, stream);
} else {
const includedStream = audioStreamsMap.get(id);
if (includedStream.bandwidth > stream.bandwidth) {
audioStreamsMap.set(id, stream);
}
}
}
const validAudioStreams = [...audioStreamsMap.values()];
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 validVideoStreams = [];
for (const stream of videoStreams) {
if (!validVideoStreams.length) {
validVideoStreams.push(stream);
} 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);
} 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);
}
}
}
}
}
const validAudioIds =
validAudioStreams.map((audioStream) => audioStream.id);
const validVideoIds =
validVideoStreams.map((videoStream) => videoStream.id);
// 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) {
if (!inRange(video.width,
restrictions.minWidth,
Math.min(restrictions.maxWidth, maxHwRes.width))) {
return false;
}
if (!inRange(video.height,
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.Variant} currentVariant
* @param {shaka.extern.Manifest} manifest
* @param {shaka.config.CodecSwitchingStrategy=} codecSwitchingStrategy
*/
static async filterManifest(drmEngine, currentVariant, manifest,
codecSwitchingStrategy=shaka.config.CodecSwitchingStrategy.RELOAD) {
await shaka.util.StreamUtils.filterManifestByMediaCapabilities(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.extern.Manifest} manifest
* @param {boolean} usePersistentLicenses
*/
static async filterManifestByMediaCapabilities(
manifest, usePersistentLicenses) {
goog.asserts.assert(navigator.mediaCapabilities,
'MediaCapabilities should be valid.');
await shaka.util.StreamUtils.getDecodingInfosForVariants(
manifest.variants, usePersistentLicenses, /* srcEquals= */ false,
/** preferredKeySystems= */ []);
manifest.variants = manifest.variants.filter((variant) => {
// See: https://github.com/shaka-project/shaka-player/issues/3860
const video = variant.video;
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;
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;
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;
}
// See: https://github.com/shaka-project/shaka-player/issues/3380
if (shaka.util.Platform.isXboxOne() && video &&
((video.width && video.width > 1920) ||
(video.height && video.height > 1080)) &&
(video.codecs.includes('avc1.') ||
video.codecs.includes('avc3.'))) {
shaka.log.debug('Dropping variant - not compatible with platform',
StreamUtils.getVariantSummaryString_(variant));
return false;
}
const supported = variant.decodingInfos.some((decodingInfo) => {
return decodingInfo.supported;
});
// 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);
try {
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 {
const result =
await navigator.mediaCapabilities.decodingInfo(decodingConfig);
cache[cacheKey] = result;
variant.decodingInfos.push(result);
}
} catch (e) {
shaka.log.info('MediaCapabilities.decodingInfo() failed.',
JSON.stringify(decodingConfig), e);
}
}
/**
* 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') {
return 'flac';
}
// The same is true for 'Opus'.
if (codecs === 'Opus') {
return 'opus';
}
// Some Tizen devices seem to misreport AC-3 support, but correctly
// report EC-3 support. So query EC-3 as a fallback for AC-3.
// See https://github.com/shaka-project/shaka-player/issues/2989 for
// details.
if (shaka.util.Platform.isTizen()) {
return codecs.toLowerCase() == 'ac-3' ? 'ec-3' : codecs;
} else {
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),
'variant.video',
StreamUtils.getStreamSummaryString_(video));
return false;
}
}
return true;
});
}
/**
* Alters the given Manifest to filter out any unsupported text streams.
*
* @param {shaka.extern.Manifest} manifest
* @private
*/
static filterTextStreams_(manifest) {
// Filter text streams.
manifest.textStreams = manifest.textStreams.filter((stream) => {
const fullMimeType = shaka.util.MimeUtils.getFullType(
stream.mimeType, stream.codecs);
const keep = shaka.text.TextEngine.isTypeSupported(fullMimeType);
if (!keep) {
shaka.log.debug('Dropping text stream. Is not supported by the ' +
'platform.', stream);
}
return keep;
});
}
/**
* Alters the given Manifest to filter out any unsupported image streams.
*
* @param {shaka.extern.Manifest} manifest
* @private
*/
static async filterImageStreams_(manifest) {
const imageStreams = [];
for (const stream of manifest.imageStreams) {
const mimeType = stream.mimeType;
if (!shaka.util.StreamUtils.supportedImageMimeTypes_.has(mimeType)) {
const minImage = shaka.util.StreamUtils.minImage_.get(mimeType);
if (minImage) {
// eslint-disable-next-line no-await-in-loop
const res = await shaka.util.StreamUtils.isImageSupported_(minImage);
shaka.util.StreamUtils.supportedImageMimeTypes_.set(mimeType, res);
} else {
shaka.util.StreamUtils.supportedImageMimeTypes_.set(mimeType, false);
}
}
const keep =
shaka.util.StreamUtils.supportedImageMimeTypes_.get(mimeType);
if (!keep) {
shaka.log.debug('Dropping image stream. Is not supported by the ' +
'platform.', stream);
} else {
imageStreams.push(stream);
}
}
manifest.imageStreams = imageStreams;
}
/**
* @param {string} minImage
* @return {!Promise.<boolean>}
* @private
*/
static isImageSupported_(minImage) {
return new Promise((resolve) => {
const imageElement = /** @type {HTMLImageElement} */(new Image());
imageElement.src = minImage;
if ('decode' in imageElement) {
imageElement.decode().then(() => {
resolve(true);
}).catch(() => {
resolve(false);
});
} else {
imageElement.onload = imageElement.onerror = () => {
resolve(imageElement.height === 2);
};
}
});
}
/**
* @param {shaka.extern.Stream} s0
* @param {shaka.extern.Stream} s1
* @return {boolean}
* @private
*/
static areStreamsCompatible_(s0, s1) {
// Basic mime types and basic codecs need to match.
// For example, we can't adapt between WebM and MP4,
// nor can we adapt between mp4a.* to ec-3.
// We can switch between text types on the fly,
// so don't run this check on text.
if (s0.mimeType != s1.mimeType) {
return false;
}
if (s0.codecs.split('.')[0] != s1.codecs.split('.')[0]) {
return false;
}
return true;
}
/**
* @param {shaka.extern.Variant} variant
* @return {shaka.extern.Track}
*/
static variantToTrack(variant) {
/** @type {?shaka.extern.Stream} */
const audio = variant.audio;
/** @type {?shaka.extern.Stream} */
const video = variant.video;
/** @type {?string} */
const audioMimeType = audio ? audio.mimeType : null;
/** @type {?string} */
const videoMimeType = video ? video.mimeType : null;
/** @type {?string} */
const audioCodec = audio ? audio.codecs : null;
/** @type {?string} */
const videoCodec = video ? video.codecs : null;
/** @type {!Array.<string>} */
const codecs = [];
if (videoCodec) {
codecs.push(videoCodec);
}
if (audioCodec) {
codecs.push(audioCodec);
}
/** @type {!Array.<string>} */
const mimeTypes = [];
if (video) {
mimeTypes.push(video.mimeType);
}
if (audio) {
mimeTypes.push(audio.mimeType);
}
/** @type {?string} */
const mimeType = mimeTypes[0] || null;
/** @type {!Array.<string>} */
const kinds = [];
if (audio) {
kinds.push(audio.kind);
}
if (video) {
kinds.push(video.kind);
}
/** @type {?string} */
const kind = kinds[0] || null;
/** @type {!Set.<string>} */
const roles = new Set();
if (audio) {
for (const role of audio.roles) {
roles.add(role);
}
}
if (video) {
for (const role of video.roles) {
roles.add(role);
}
}
/** @type {shaka.extern.Track} */
const track = {
id: variant.id,
active: false,
type: 'variant',
bandwidth: variant.bandwidth,
language: variant.language,
label: null,
kind: kind,
width: null,
height: null,
frameRate: null,
pixelAspectRatio: null,
hdr: null,
mimeType: mimeType,
audioMimeType: audioMimeType,
videoMimeType: videoMimeType,
codecs: codecs.join(', '),
audioCodec: audioCodec,
videoCodec: videoCodec,
primary: variant.primary,
roles: Array.from(roles),
audioRoles: null,
forced: false,
videoId: null,
audioId: null,
channelsCount: null,
audioSamplingRate: null,
spatialAudio: false,
tilesLayout: null,
audioBandwidth: null,
videoBandwidth: null,
originalVideoId: null,
originalAudioId: null,
originalTextId: null,
originalImageId: null,
accessibilityPurpose: null,
originalLanguage: null,
};
if (video) {
track.videoId = video.id;
track.originalVideoId = video.originalId;
track.width = video.width || null;
track.height = video.height || null;
track.frameRate = video.frameRate || null;
track.pixelAspectRatio = video.pixelAspectRatio || null;
track.videoBandwidth = video.bandwidth || null;
track.hdr = video.hdr || null;
}
if (audio) {
track.audioId = audio.id;
track.originalAudioId = audio.originalId;
track.channelsCount = audio.channelsCount;
track.audioSamplingRate = audio.audioSamplingRate;
track.audioBandwidth = audio.bandwidth || null;
track.spatialAudio = audio.spatialAudio;
track.label = audio.label;
track.audioRoles = audio.roles;
track.accessibilityPurpose = audio.accessibilityPurpose;
track.originalLanguage = audio.originalLanguage;
}
return track;
}
/**
* @param {shaka.extern.Stream} stream
* @return {shaka.extern.Track}
*/
static textStreamToTrack(stream) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
/** @type {shaka.extern.Track} */
const track = {
id: stream.id,
active: false,
type: ContentType.TEXT,
bandwidth: 0,
language: stream.language,
label: stream.label,
kind: stream.kind || null,
width: null,
height: null,
frameRate: null,
pixelAspectRatio: null,
hdr: null,
mimeType: stream.mimeType,
audioMimeType: null,
videoMimeType: null,
codecs: stream.codecs || null,
audioCodec: null,
videoCodec: null,
primary: stream.primary,
roles: stream.roles,
audioRoles: null,
forced: stream.forced,
videoId: null,
audioId: null,
channelsCount: null,
audioSamplingRate: null,
spatialAudio: false,
tilesLayout: null,
audioBandwidth: null,
videoBandwidth: null,
originalVideoId: null,
originalAudioId: null,
originalTextId: stream.originalId,
originalImageId: null,
accessibilityPurpose: stream.accessibilityPurpose,
originalLanguage: stream.originalLanguage,
};
return track;
}
/**
* @param {shaka.extern.Stream} stream
* @return {shaka.extern.Track}
*/
static imageStreamToTrack(stream) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
let width = stream.width || null;
let height = stream.height || null;
// The stream width and height represent the size of the entire thumbnail
// sheet, so divide by the layout.
let reference = null;
// Note: segmentIndex is built by default for HLS, but not for DASH, but
// in DASH this information comes at the stream level and not at the
// segment level.
if (stream.segmentIndex) {
reference = stream.segmentIndex.get(0);
}
let layout = stream.tilesLayout;
if (reference) {
layout = reference.getTilesLayout() || layout;
}
if (layout && width != null) {
width /= Number(layout.split('x')[0]);
}
if (layout && height != null) {
height /= Number(layout.split('x')[1]);
}
// TODO: What happens if there are multiple grids, with different
// layout sizes, inside this image stream?
/** @type {shaka.extern.Track} */
const track = {
id: stream.id,
active: false,
type: ContentType.IMAGE,
bandwidth: stream.bandwidth || 0,
language: '',
label: null,
kind: null,
width,
height,
frameRate: null,
pixelAspectRatio: null,
hdr: null,
mimeType: stream.mimeType,
audioMimeType: null,
videoMimeType: null,
codecs: null,
audioCodec: null,
videoCodec: null,
primary: false,
roles: [],
audioRoles: null,
forced: false,
videoId: null,
audioId: null,
channelsCount: null,
audioSamplingRate: null,
spatialAudio: false,
tilesLayout: layout || null,
audioBandwidth: null,
videoBandwidth: null,
originalVideoId: null,
originalAudioId: null,
originalTextId: null,
originalImageId: stream.originalId,
accessibilityPurpose: null,
originalLanguage: null,
};
return track;
}
/**
* Generate and return an ID for this track, since the ID field is optional.
*
* @param {TextTrack|AudioTrack} html5Track
* @return {number} The generated ID.
*/
static html5TrackId(html5Track) {
if (!html5Track['__shaka_id']) {
html5Track['__shaka_id'] = shaka.util.StreamUtils.nextTrackId_++;
}
return html5Track['__shaka_id'];
}
/**
* @param {TextTrack} textTrack
* @return {shaka.extern.Track}
*/
static html5TextTrackToTrack(textTrack) {
const CLOSED_CAPTION_MIMETYPE =
shaka.util.MimeUtils.CEA608_CLOSED_CAPTION_MIMETYPE;
const StreamUtils = shaka.util.StreamUtils;
/** @type {shaka.extern.Track} */
const track = StreamUtils.html5TrackToGenericShakaTrack_(textTrack);
track.active = textTrack.mode != 'disabled';
track.type = 'text';
track.originalTextId = textTrack.id;
if (textTrack.kind == 'captions') {
track.mimeType = CLOSED_CAPTION_MIMETYPE;
}
if (textTrack.kind == 'subtitles') {
track.mimeType = 'text/vtt';
}
if (textTrack.kind) {
track.roles = [textTrack.kind];
}
if (textTrack.kind == 'forced') {
track.forced = true;
}
return track;
}
/**
* @param {AudioTrack} audioTrack
* @return {shaka.extern.Track}
*/
static html5AudioTrackToTrack(audioTrack) {
const StreamUtils = shaka.util.StreamUtils;
/** @type {shaka.extern.Track} */
const track = StreamUtils.html5TrackToGenericShakaTrack_(audioTrack);
track.active = audioTrack.enabled;
track.type = 'variant';
track.originalAudioId = audioTrack.id;
if (audioTrack.kind == 'main') {
track.primary = true;
}
if (audioTrack.kind) {
track.roles = [audioTrack.kind];
track.audioRoles = [audioTrack.kind];
track.label = audioTrack.label;
}
return track;
}
/**
* Creates a Track object with non-type specific fields filled out. The
* caller is responsible for completing the Track object with any
* type-specific information (audio or text).
*
* @param {TextTrack|AudioTrack} html5Track
* @return {shaka.extern.Track}
* @private
*/
static html5TrackToGenericShakaTrack_(html5Track) {
const language = html5Track.language;
/** @type {shaka.extern.Track} */
const track = {
id: shaka.util.StreamUtils.html5TrackId(html5Track),
active: false,
type: '',
bandwidth: 0,
language: shaka.util.LanguageUtils.normalize(language || 'und'),
label: html5Track.label,
kind: html5Track.kind,
width: null,
height: null,
frameRate: null,
pixelAspectRatio: null,
hdr: null,
mimeType: null,
audioMimeType: null,
videoMimeType: null,
codecs: null,
audioCodec: null,
videoCodec: null,
primary: false,
roles: [],
forced: false,
audioRoles: null,
videoId: null,
audioId: null,
channelsCount: null,
audioSamplingRate: null,
spatialAudio: false,
tilesLayout: null,
audioBandwidth: null,
videoBandwidth: null,
originalVideoId: null,
originalAudioId: null,
originalTextId: null,
originalImageId: null,
accessibilityPurpose: null,
originalLanguage: language,
};
return track;
}
/**
* Determines if the given variant is playable.
* @param {!shaka.extern.Variant} variant
* @return {boolean}
*/
static isPlayable(variant) {
return variant.allowedByApplication &&
variant.allowedByKeySystem &&
variant.disabledUntilTime == 0;
}
/**
* Filters out unplayable variants.
* @param {!Array.<!shaka.extern.Variant>} variants
* @return {!Array.<!shaka.extern.Variant>}
*/
static getPlayableVariants(variants) {
return variants.filter((variant) => {
return shaka.util.StreamUtils.isPlayable(variant);
});
}
/**
* Filters variants according to the given audio channel count config.
*
* @param {!Array.<shaka.extern.Variant>} variants
* @param {number} preferredAudioChannelCount
* @return {!Array.<!shaka.extern.Variant>}
*/
static filterVariantsByAudioChannelCount(
variants, preferredAudioChannelCount) {
// Group variants by their audio channel counts.
const variantsWithChannelCounts =
variants.filter((v) => v.audio && v.audio.channelsCount);
/** @type {!Map.<number, !Array.<shaka.extern.Variant>>} */
const variantsByChannelCount = new Map();
const capableVariants = [];
for (const variant of variantsWithChannelCounts) {
const count = variant.audio.channelsCount;
goog.asserts.assert(count != null, 'Must have count after filtering!');
if (!variantsByChannelCount.has(count)) {
variantsByChannelCount.set(count, []);
}
variantsByChannelCount.get(count).push(variant);
if (count <= preferredAudioChannelCount) {
capableVariants.push(variant);
}
}
// return all capable channelcounts
if (capableVariants.length) {
return capableVariants;
}
/** @type {!Array.<number>} */
const channelCounts = Array.from(variantsByChannelCount.keys());
// If no variant has audio channel count info, return the original variants.
if (channelCounts.length == 0) {
return variants;
}
// If all variants have more audio channels than the config, choose the
// variants with the fewest audio channels.
return variantsByChannelCount.get(Math.min(...channelCounts));
}
/**
* Chooses streams according to the given config.
* Works both for Stream and Track types due to their similarities.
*
* @param {!Array<!shaka.extern.Stream>|!Array<!shaka.extern.Track>} streams
* @param {string} preferredLanguage
* @param {string} preferredRole
* @param {boolean} preferredForced
* @return {!Array<!shaka.extern.Stream>|!Array<!shaka.extern.Track>}
*/
static filterStreamsByLanguageAndRole(
streams, preferredLanguage, preferredRole, preferredForced) {
const LanguageUtils = shaka.util.LanguageUtils;
/** @type {!Array<!shaka.extern.Stream>|!Array<!shaka.extern.Track>} */
let chosen = streams;
// Start with the set of primary streams.
/** @type {!Array<!shaka.extern.Stream>|!Array<!shaka.extern.Track>} */
const primary = streams.filter((stream) => {
return stream.primary;
});
if (primary.length) {
chosen = primary;
}
// Now reduce the set to one language. This covers both arbitrary language
// choice and the reduction of the "primary" stream set to one language.
const firstLanguage = chosen.length ? chosen[0].language : '';
chosen = chosen.filter((stream) => {
return stream.language == firstLanguage;
});
// Find the streams that best match our language preference. This will
// override previous selections.
if (preferredLanguage) {
const closestLocale = LanguageUtils.findClosestLocale(
LanguageUtils.normalize(preferredLanguage),
streams.map((stream) => stream.language));
// Only replace |chosen| if we found a locale that is close to our
// preference.
if (closestLocale) {
chosen = streams.filter((stream) => {
const locale = LanguageUtils.normalize(stream.language);
return locale == closestLocale;
});
}
}
// Filter by forced preference
chosen = chosen.filter((stream) => {
return stream.forced == preferredForced;
});
// Now refine the choice based on role preference.
if (preferredRole) {
const roleMatches = shaka.util.StreamUtils.filterStreamsByRole_(
chosen, preferredRole);
if (roleMatches.length) {
return roleMatches;
} else {
shaka.log.warning('No exact match for the text role could be found.');
}
} else {
// Prefer text streams with no roles, if they exist.
const noRoleMatches = chosen.filter((stream) => {
return stream.roles.length == 0;
});
if (noRoleMatches.length) {
return noRoleMatches;
}
}
// Either there was no role preference, or it could not be satisfied.
// Choose an arbitrary role, if there are any, and filt