mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Joey Parrish
0911a6b3d0
This is only defined on Stream, not Variant. This bug has was introduced in PR #2332 and the v2.5.8 release and affects v2.5.8 - v2.5.10. The corresponding feature (frameRate restrictions) has actually never worked. This was caught by a compiler upgrade which is still in progress. Change-Id: I0409d9be8d3f6eb0794775ca29f28b98208bab4f
790 lines
23 KiB
JavaScript
790 lines
23 KiB
JavaScript
/** @license
|
|
* 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.DrmEngine');
|
|
goog.require('shaka.media.MediaSourceEngine');
|
|
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');
|
|
|
|
|
|
/**
|
|
* @summary A set of utility functions for dealing with Streams and Manifests.
|
|
*/
|
|
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 {number} preferredAudioChannelCount
|
|
*/
|
|
static chooseCodecsAndFilterManifest(manifest, preferredAudioChannelCount) {
|
|
const MimeUtils = shaka.util.MimeUtils;
|
|
|
|
// To start, consider a subset of variants based on audio channel
|
|
// preferences.
|
|
// For some content (#1013), surround-sound variants will use a different
|
|
// codec than stereo variants, so it is important to choose codecs **after**
|
|
// considering the audio channel config.
|
|
const variants = shaka.util.StreamUtils.filterVariantsByAudioChannelCount(
|
|
manifest.variants, preferredAudioChannelCount);
|
|
|
|
function variantCodecs(variant) {
|
|
// Only consider the base of the codec string. For example, these should
|
|
// both be considered the same codec: avc1.42c01e, avc1.4d401f
|
|
let baseVideoCodec = '';
|
|
if (variant.video) {
|
|
baseVideoCodec = MimeUtils.getCodecBase(variant.video.codecs);
|
|
}
|
|
|
|
let baseAudioCodec = '';
|
|
if (variant.audio) {
|
|
baseAudioCodec = MimeUtils.getCodecBase(variant.audio.codecs);
|
|
}
|
|
|
|
return baseVideoCodec + '-' + baseAudioCodec;
|
|
}
|
|
|
|
// Now organize variants into buckets by codecs.
|
|
/** @type {!shaka.util.MultiMap.<shaka.extern.Variant>} */
|
|
const variantsByCodecs = new shaka.util.MultiMap();
|
|
for (const variant of variants) {
|
|
const group = variantCodecs(variant);
|
|
variantsByCodecs.push(group, variant);
|
|
}
|
|
|
|
// Compute the average bandwidth for each group of variants.
|
|
// Choose the lowest-bandwidth codecs.
|
|
let bestCodecs = null;
|
|
let lowestAverageBandwidth = Infinity;
|
|
variantsByCodecs.forEach((codecs, variants) => {
|
|
let sum = 0;
|
|
let num = 0;
|
|
for (const variant of variants) {
|
|
sum += variant.bandwidth || 0;
|
|
++num;
|
|
}
|
|
const averageBandwidth = sum / num;
|
|
shaka.log.debug('codecs', codecs, 'avg bandwidth', averageBandwidth);
|
|
|
|
if (averageBandwidth < lowestAverageBandwidth) {
|
|
bestCodecs = codecs;
|
|
lowestAverageBandwidth = averageBandwidth;
|
|
}
|
|
});
|
|
goog.asserts.assert(bestCodecs != null, 'Should have chosen codecs!');
|
|
goog.asserts.assert(!isNaN(lowestAverageBandwidth),
|
|
'Bandwidth should be a number!');
|
|
|
|
// Filter out any variants that don't match, forcing AbrManager to choose
|
|
// from the most efficient variants possible.
|
|
manifest.variants = manifest.variants.filter((variant) => {
|
|
const codecs = variantCodecs(variant);
|
|
if (codecs == bestCodecs) {
|
|
return true;
|
|
}
|
|
|
|
shaka.log.debug('Dropping Variant (better codec available)', variant);
|
|
return false;
|
|
});
|
|
}
|
|
|
|
/**
|
|
* @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}
|
|
*/
|
|
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
|
|
*/
|
|
static filterManifest(drmEngine, currentVariant, manifest) {
|
|
const StreamUtils = shaka.util.StreamUtils;
|
|
|
|
// Filter variants.
|
|
manifest.variants = manifest.variants.filter((variant) => {
|
|
if (drmEngine && drmEngine.initialized()) {
|
|
if (!drmEngine.supportsVariant(variant)) {
|
|
shaka.log.debug('Dropping variant - not compatible with key system',
|
|
variant);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
const audio = variant.audio;
|
|
const video = variant.video;
|
|
|
|
if (audio && !shaka.media.MediaSourceEngine.isStreamSupported(audio)) {
|
|
shaka.log.debug('Dropping variant - audio not compatible with platform',
|
|
StreamUtils.getStreamSummaryString_(audio));
|
|
return false;
|
|
}
|
|
|
|
if (video && !shaka.media.MediaSourceEngine.isStreamSupported(video)) {
|
|
shaka.log.debug('Dropping variant - video not compatible with platform',
|
|
StreamUtils.getStreamSummaryString_(video));
|
|
return false;
|
|
}
|
|
|
|
if (audio && currentVariant && currentVariant.audio) {
|
|
if (!StreamUtils.areStreamsCompatible_(audio, currentVariant.audio)) {
|
|
shaka.log.debug('Droping 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('Droping variant - not compatible with active video',
|
|
'active video',
|
|
StreamUtils.getStreamSummaryString_(currentVariant.video),
|
|
'variant.video',
|
|
StreamUtils.getStreamSummaryString_(video));
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
});
|
|
|
|
// 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;
|
|
});
|
|
}
|
|
|
|
|
|
/**
|
|
* @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 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,
|
|
mimeType: mimeType,
|
|
codecs: codecs.join(', '),
|
|
audioCodec: audioCodec,
|
|
videoCodec: videoCodec,
|
|
primary: variant.primary,
|
|
roles: Array.from(roles),
|
|
audioRoles: null,
|
|
videoId: null,
|
|
audioId: null,
|
|
channelsCount: null,
|
|
audioSamplingRate: null,
|
|
audioBandwidth: null,
|
|
videoBandwidth: null,
|
|
originalVideoId: null,
|
|
originalAudioId: null,
|
|
originalTextId: 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;
|
|
}
|
|
|
|
if (audio) {
|
|
track.audioId = audio.id;
|
|
track.originalAudioId = audio.originalId;
|
|
track.channelsCount = audio.channelsCount;
|
|
track.audioSamplingRate = audio.audioSamplingRate;
|
|
track.audioBandwidth = audio.bandwidth || null;
|
|
track.label = audio.label;
|
|
track.audioRoles = audio.roles;
|
|
}
|
|
|
|
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,
|
|
mimeType: stream.mimeType,
|
|
codecs: stream.codecs || null,
|
|
audioCodec: null,
|
|
videoCodec: null,
|
|
primary: stream.primary,
|
|
roles: stream.roles,
|
|
audioRoles: null,
|
|
videoId: null,
|
|
audioId: null,
|
|
channelsCount: null,
|
|
audioSamplingRate: null,
|
|
audioBandwidth: null,
|
|
videoBandwidth: null,
|
|
originalVideoId: null,
|
|
originalAudioId: null,
|
|
originalTextId: stream.originalId,
|
|
};
|
|
|
|
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.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;
|
|
}
|
|
|
|
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;
|
|
track.roles = ['main'];
|
|
track.audioRoles = ['main'];
|
|
} else {
|
|
track.audioRoles = [];
|
|
}
|
|
|
|
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) {
|
|
/** @type {shaka.extern.Track} */
|
|
const track = {
|
|
id: shaka.util.StreamUtils.html5TrackId(html5Track),
|
|
active: false,
|
|
type: '',
|
|
bandwidth: 0,
|
|
language: shaka.util.LanguageUtils.normalize(html5Track.language),
|
|
label: html5Track.label,
|
|
kind: html5Track.kind,
|
|
width: null,
|
|
height: null,
|
|
frameRate: null,
|
|
pixelAspectRatio: null,
|
|
mimeType: null,
|
|
codecs: null,
|
|
audioCodec: null,
|
|
videoCodec: null,
|
|
primary: false,
|
|
roles: [],
|
|
audioRoles: null,
|
|
videoId: null,
|
|
audioId: null,
|
|
channelsCount: null,
|
|
audioSamplingRate: null,
|
|
audioBandwidth: null,
|
|
videoBandwidth: null,
|
|
originalVideoId: null,
|
|
originalAudioId: null,
|
|
originalTextId: null,
|
|
};
|
|
|
|
return track;
|
|
}
|
|
|
|
|
|
/**
|
|
* Determines if the given variant is playable.
|
|
* @param {!shaka.extern.Variant} variant
|
|
* @return {boolean}
|
|
*/
|
|
static isPlayable(variant) {
|
|
return variant.allowedByApplication && variant.allowedByKeySystem;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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();
|
|
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);
|
|
}
|
|
|
|
/** @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;
|
|
}
|
|
|
|
// Choose the variants with the largest number of audio channels less than
|
|
// or equal to the configured number of audio channels.
|
|
const countLessThanOrEqualtoConfig =
|
|
channelCounts.filter((count) => count <= preferredAudioChannelCount);
|
|
if (countLessThanOrEqualtoConfig.length) {
|
|
return variantsByChannelCount.get(
|
|
Math.max(...countLessThanOrEqualtoConfig));
|
|
}
|
|
|
|
// 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.
|
|
*
|
|
* @param {!Array.<shaka.extern.Stream>} streams
|
|
* @param {string} preferredLanguage
|
|
* @param {string} preferredRole
|
|
* @return {!Array.<!shaka.extern.Stream>}
|
|
*/
|
|
static filterStreamsByLanguageAndRole(
|
|
streams, preferredLanguage, preferredRole) {
|
|
const LanguageUtils = shaka.util.LanguageUtils;
|
|
|
|
/** @type {!Array.<!shaka.extern.Stream>} */
|
|
let chosen = streams;
|
|
|
|
// Start with the set of primary streams.
|
|
/** @type {!Array.<!shaka.extern.Stream>} */
|
|
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;
|
|
});
|
|
}
|
|
}
|
|
|
|
// Now refine the choice based on role preference.
|
|
if (preferredRole) {
|
|
const roleMatches = shaka.util.StreamUtils.filterTextStreamsByRole_(
|
|
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 filter out any other
|
|
// roles. This ensures we never adapt between roles.
|
|
|
|
const allRoles = chosen.map((stream) => {
|
|
return stream.roles;
|
|
}).reduce(shaka.util.Functional.collapseArrays, []);
|
|
|
|
if (!allRoles.length) {
|
|
return chosen;
|
|
}
|
|
return shaka.util.StreamUtils.filterTextStreamsByRole_(chosen, allRoles[0]);
|
|
}
|
|
|
|
|
|
/**
|
|
* Filter text Streams by role.
|
|
*
|
|
* @param {!Array.<shaka.extern.Stream>} textStreams
|
|
* @param {string} preferredRole
|
|
* @return {!Array.<shaka.extern.Stream>}
|
|
* @private
|
|
*/
|
|
static filterTextStreamsByRole_(textStreams, preferredRole) {
|
|
return textStreams.filter((stream) => {
|
|
return stream.roles.includes(preferredRole);
|
|
});
|
|
}
|
|
|
|
|
|
/**
|
|
* Checks if the given stream is an audio stream.
|
|
*
|
|
* @param {shaka.extern.Stream} stream
|
|
* @return {boolean}
|
|
*/
|
|
static isAudio(stream) {
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
return stream.type == ContentType.AUDIO;
|
|
}
|
|
|
|
|
|
/**
|
|
* Checks if the given stream is a video stream.
|
|
*
|
|
* @param {shaka.extern.Stream} stream
|
|
* @return {boolean}
|
|
*/
|
|
static isVideo(stream) {
|
|
const ContentType = shaka.util.ManifestParserUtils.ContentType;
|
|
return stream.type == ContentType.VIDEO;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get all non-null streams in the variant as an array.
|
|
*
|
|
* @param {shaka.extern.Variant} variant
|
|
* @return {!Array.<shaka.extern.Stream>}
|
|
*/
|
|
static getVariantStreams(variant) {
|
|
const streams = [];
|
|
|
|
if (variant.audio) {
|
|
streams.push(variant.audio);
|
|
}
|
|
if (variant.video) {
|
|
streams.push(variant.video);
|
|
}
|
|
|
|
return streams;
|
|
}
|
|
|
|
|
|
/**
|
|
* @param {shaka.extern.Stream} stream
|
|
* @return {string}
|
|
* @private
|
|
*/
|
|
static getStreamSummaryString_(stream) {
|
|
// Accepted parameters for Chromecast can be found (internally) at
|
|
// go/cast-mime-params
|
|
|
|
if (shaka.util.StreamUtils.isAudio(stream)) {
|
|
return 'type=audio' +
|
|
' codecs=' + stream.codecs +
|
|
' bandwidth='+ stream.bandwidth +
|
|
' channelsCount=' + stream.channelsCount +
|
|
' audioSamplingRate=' + stream.audioSamplingRate;
|
|
}
|
|
|
|
if (shaka.util.StreamUtils.isVideo(stream)) {
|
|
return 'type=video' +
|
|
' codecs=' + stream.codecs +
|
|
' bandwidth=' + stream.bandwidth +
|
|
' frameRate=' + stream.frameRate +
|
|
' width=' + stream.width +
|
|
' height=' + stream.height;
|
|
}
|
|
|
|
return 'unexpected stream type';
|
|
}
|
|
};
|
|
|
|
|
|
/** @private {number} */
|
|
shaka.util.StreamUtils.nextTrackId_ = 0;
|