/**
* @license
* Copyright 2016 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
goog.provide('shaka.hls.HlsParser');
goog.require('goog.asserts');
goog.require('shaka.hls.ManifestTextParser');
goog.require('shaka.hls.Playlist');
goog.require('shaka.hls.PlaylistType');
goog.require('shaka.hls.Tag');
goog.require('shaka.hls.Utils');
goog.require('shaka.log');
goog.require('shaka.media.DrmEngine');
goog.require('shaka.media.InitSegmentReference');
goog.require('shaka.media.ManifestParser');
goog.require('shaka.media.PresentationTimeline');
goog.require('shaka.media.SegmentIndex');
goog.require('shaka.media.SegmentReference');
goog.require('shaka.net.DataUriPlugin');
goog.require('shaka.net.NetworkingEngine');
goog.require('shaka.util.Error');
goog.require('shaka.util.Functional');
goog.require('shaka.util.ManifestParserUtils');
/**
* Creates a new HLS parser.
*
* @struct
* @constructor
* @implements {shakaExtern.ManifestParser}
* @export
*/
shaka.hls.HlsParser = function() {
/** @private {?shakaExtern.ManifestParser.PlayerInterface} */
this.playerInterface_ = null;
/** @private {?shakaExtern.ManifestConfiguration} */
this.config_ = null;
/** @private {number} */
this.globalId_ = 1;
/** @private {!Object.<number, shaka.hls.HlsParser.StreamInfo>} */
this.mediaTagsToStreamInfosMap_ = {};
/** @private {!Object.<number, !shaka.media.SegmentIndex>} */
this.streamsToIndexMap_ = {};
/** @private {?shaka.media.PresentationTimeline} */
this.presentationTimeline_ = null;
/** @private {string} */
this.manifestUri_ = '';
/** @private {shaka.hls.ManifestTextParser} */
this.manifestTextParser_ = new shaka.hls.ManifestTextParser();
};
/**
* @typedef {{
* stream: !shakaExtern.Stream,
* segmentIndex: !shaka.media.SegmentIndex,
* drmInfos: !Array.<shakaExtern.DrmInfo>
* }}
*
* @description
* Contains a stream and information about it.
*
* @property {!shakaExtern.Stream} stream
* The Stream itself.
* @property {!shaka.media.SegmentIndex} segmentIndex
* SegmentIndex of the stream.
* @property {!Array.<shakaExtern.DrmInfo>} drmInfos
* DrmInfos of the stream. There may be multiple for multi-DRM content.
*/
shaka.hls.HlsParser.StreamInfo;
/** @override */
shaka.hls.HlsParser.prototype.configure = function(config) {
this.config_ = config;
};
/** @override */
shaka.hls.HlsParser.prototype.start = function(uri, playerInterface) {
goog.asserts.assert(this.config_, 'Must call configure() before start()!');
this.playerInterface_ = playerInterface;
this.manifestUri_ = uri;
return this.requestManifest_(uri).then(function(response) {
return this.parseManifest_(response.data, uri);
}.bind(this));
};
/** @override */
shaka.hls.HlsParser.prototype.stop = function() {
this.playerInterface_ = null;
this.config_ = null;
this.mediaTagsToStreamInfosMap_ = {};
return Promise.resolve();
};
/** @override */
shaka.hls.HlsParser.prototype.update = function() {
// TODO: Implement support for live content.
};
/** @override */
shaka.hls.HlsParser.prototype.onExpirationUpdated = function(
sessionId, expiration) {
// No-op
};
/**
* Parses the manifest.
*
* @param {!ArrayBuffer} data
* @param {string} uri
* @return {!Promise.<!shakaExtern.Manifest>}
* @throws shaka.util.Error When there is a parsing error.
* @private
*/
shaka.hls.HlsParser.prototype.parseManifest_ = function(data, uri) {
var playlist = this.manifestTextParser_.parsePlaylist(data, uri);
// We don't support directly providing a Media Playlist.
// See error code for details.
if (playlist.type != shaka.hls.PlaylistType.MASTER) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.HLS_MASTER_PLAYLIST_NOT_PROVIDED);
}
// TODO: Implement support for live content.
this.presentationTimeline_ = new shaka.media.PresentationTimeline(null, 0);
return this.createPeriod_(playlist).then(function(period) {
// HLS has no notion of periods. We're treating the whole presentation as
// one period.
this.playerInterface_.filterPeriod(period);
return {
presentationTimeline: this.presentationTimeline_,
periods: [period],
offlineSessionIds: [],
minBufferTime: 0
};
}.bind(this));
};
/**
* Parses a playlist into a Period object.
*
* @param {!shaka.hls.Playlist} playlist
* @return {!Promise.<!shakaExtern.Period>}
* @private
*/
shaka.hls.HlsParser.prototype.createPeriod_ = function(playlist) {
var Utils = shaka.hls.Utils;
var Functional = shaka.util.Functional;
var tags = playlist.tags;
// Create Variants for every 'EXT-X-STREAM-INF' tag.
var variantTags = Utils.filterTagsByName(tags, 'EXT-X-STREAM-INF');
var variantsPromises = variantTags.map(function(tag) {
return this.createVariantsForTag_(tag, playlist);
}.bind(this));
var mediaTags = Utils.filterTagsByName(playlist.tags, 'EXT-X-MEDIA');
var textStreamTags = mediaTags.filter(function(tag) {
var type = shaka.hls.HlsParser.getRequiredAttributeValue_(tag, 'TYPE');
return type == 'SUBTITLES';
}.bind(this));
// TODO: CLOSED-CAPTIONS requires the parsing of CEA-608 from the video.
var textStreamPromises = textStreamTags.map(function(tag) {
return this.createTextStream_(tag, playlist);
}.bind(this));
return Promise.all(variantsPromises).then(function(allVariants) {
return Promise.all(textStreamPromises).then(function(textStreams) {
var variants = allVariants.reduce(Functional.collapseArrays, []);
this.fitSegments_(variants);
return {
startTime: 0,
variants: variants,
textStreams: textStreams
};
}.bind(this));
}.bind(this));
};
/**
* @param {!shaka.hls.Tag} tag
* @param {!shaka.hls.Playlist} playlist
* @return {!Promise.<!Array.<!shakaExtern.Variant>>}
* @private
*/
shaka.hls.HlsParser.prototype.createVariantsForTag_ = function(tag, playlist) {
goog.asserts.assert(tag.name == 'EXT-X-STREAM-INF',
'Should only be called on variant tags!');
var ContentType = shaka.util.ManifestParserUtils.ContentType;
var HlsParser = shaka.hls.HlsParser;
var Utils = shaka.hls.Utils;
var bandwidth =
Number(HlsParser.getRequiredAttributeValue_(tag, 'BANDWIDTH'));
var codecs = HlsParser.getRequiredAttributeValue_(tag, 'CODECS').split(',');
var resolutionAttr = tag.getAttribute('RESOLUTION');
var width;
var height;
var frameRate;
var frameRateAttr = tag.getAttribute('FRAME-RATE');
if (frameRateAttr)
frameRate = frameRateAttr.value;
if (resolutionAttr) {
var resBlocks = resolutionAttr.value.split('x');
width = resBlocks[0];
height = resBlocks[1];
}
var timeOffset = this.getTimeOffset_(playlist);
var mediaTags = Utils.filterTagsByName(playlist.tags, 'EXT-X-MEDIA');
var audioAttr = tag.getAttribute('AUDIO');
var videoAttr = tag.getAttribute('VIDEO');
var audioPromises = [];
var videoPromises = [];
if (audioAttr) {
var audioTags = Utils.findMediaTags(mediaTags, 'AUDIO', audioAttr.value);
audioPromises = audioTags.map(function(tag) {
return this.createStreamInfoFromMediaTag_(tag, codecs, timeOffset);
}.bind(this));
}
if (videoAttr) {
var videoTags = Utils.findMediaTags(mediaTags, 'VIDEO', videoAttr.value);
videoPromises = videoTags.map(function(tag) {
return this.createStreamInfoFromMediaTag_(tag, codecs, timeOffset);
}.bind(this));
}
var audioStreamInfos = [];
var videoStreamInfos = [];
return Promise
.all([
Promise.all(audioPromises),
Promise.all(videoPromises)
])
.then(function(data) {
audioStreamInfos = data[0];
videoStreamInfos = data[1];
// TODO: find examples of audio-only variants and account
// for them.
if (videoStreamInfos.length && audioStreamInfos.length) {
return null;
} else if (videoStreamInfos.length && !audioStreamInfos.length) {
// If video streams have been described by a media tag,
// assume the underlying uri describes audio.
return this.createStreamInfoFromVariantTag_(
tag, codecs,
ContentType.AUDIO,
timeOffset);
} else {
// In any other case (video-only variants, multiplexed
// content audio described by a media tag) assume the
// underlying uri describes video.
return this.createStreamInfoFromVariantTag_(
tag, codecs,
ContentType.VIDEO,
timeOffset);
}
}.bind(this))
.then(function(streamInfo) {
if (streamInfo) {
if (streamInfo.stream.type == ContentType.AUDIO)
audioStreamInfos = [streamInfo];
else
videoStreamInfos = [streamInfo];
}
return this.createVariants_(audioStreamInfos,
videoStreamInfos,
bandwidth,
width,
height,
frameRate);
}.bind(this));
};
/**
* @param {!Array.<!shaka.hls.HlsParser.StreamInfo>} audioInfos
* @param {!Array.<!shaka.hls.HlsParser.StreamInfo>} videoInfos
* @param {number} bandwidth
* @param {!string|undefined} width
* @param {!string|undefined} height
* @param {!string|undefined} frameRate
* @return {!Array.<!shakaExtern.Variant>}
* @private
*/
shaka.hls.HlsParser.prototype.createVariants_ =
function(audioInfos, videoInfos, bandwidth, width, height, frameRate) {
var DrmEngine = shaka.media.DrmEngine;
videoInfos.forEach(function(info) {
this.addVideoAttributes_(info.stream, width, height, frameRate);
}.bind(this));
// In case of audio-only or video-only content, we create an array of
// one item containing a null. This way, the double-loop works for all
// kinds of content.
// NOTE: we currently don't have support for audio-only content.
if (!audioInfos.length)
audioInfos = [null];
if (!videoInfos.length)
videoInfos = [null];
var variants = [];
for (var i = 0; i < audioInfos.length; i++) {
for (var j = 0; j < videoInfos.length; j++) {
var audioStream = audioInfos[i] ? audioInfos[i].stream : null;
var videoStream = videoInfos[j] ? videoInfos[j].stream : null;
var audioDrmInfos = audioInfos[i] ? audioInfos[i].drmInfos : null;
var videoDrmInfos = videoInfos[j] ? videoInfos[j].drmInfos : null;
var drmInfos;
if (audioStream && videoStream) {
if (DrmEngine.areDrmCompatible(audioDrmInfos, videoDrmInfos)) {
drmInfos = DrmEngine.getCommonDrmInfos(audioDrmInfos, videoDrmInfos);
} else {
shaka.log.warning('Incompatible DRM info in HLS variant. Skipping.');
continue;
}
} else if (audioStream) {
drmInfos = audioDrmInfos;
} else if (videoStream) {
drmInfos = videoDrmInfos;
}
variants.push(this.createVariant_(
audioStream, videoStream, bandwidth, drmInfos));
}
}
return variants;
};
/**
* @param {shakaExtern.Stream} audio
* @param {shakaExtern.Stream} video
* @param {number} bandwidth
* @param {!Array.<shakaExtern.DrmInfo>} drmInfos
* @return {!shakaExtern.Variant}
* @private
*/
shaka.hls.HlsParser.prototype.createVariant_ =
function(audio, video, bandwidth, drmInfos) {
var ContentType = shaka.util.ManifestParserUtils.ContentType;
// Since both audio and video are of the same type, this assertion will catch
// certain mistakes at runtime that the compiler would miss.
goog.asserts.assert(!audio || audio.type == ContentType.AUDIO,
'Audio parameter mismatch!');
goog.asserts.assert(!video || video.type == ContentType.VIDEO,
'Video parameter mismatch!');
return {
id: this.globalId_++,
language: audio ? audio.language : 'und',
primary: (!!audio && audio.primary) || (!!video && video.primary),
audio: audio,
video: video,
bandwidth: bandwidth,
drmInfos: drmInfos,
allowedByApplication: true,
allowedByKeySystem: true
};
};
/**
* Parses an EXT-X-MEDIA tag with TYPE="SUBTITLES" into a text stream.
*
* @param {!shaka.hls.Tag} tag
* @param {!shaka.hls.Playlist} playlist
* @return {!Promise.<?shakaExtern.Stream>}
* @private
*/
shaka.hls.HlsParser.prototype.createTextStream_ = function(tag, playlist) {
goog.asserts.assert(tag.name == 'EXT-X-MEDIA',
'Should only be called on media tags!');
var type = shaka.hls.HlsParser.getRequiredAttributeValue_(tag, 'TYPE');
goog.asserts.assert(type == 'SUBTITLES',
'Should only be called on tags with TYPE="SUBTITLES"!');
var timeOffset = this.getTimeOffset_(playlist);
return this.createStreamInfoFromMediaTag_(tag, [], timeOffset)
.then(function(streamInfo) {
return streamInfo.stream;
});
};
/**
* Parse EXT-X-MEDIA media tag into a Stream object.
*
* @param {shaka.hls.Tag} tag
* @param {!Array.<!string>} allCodecs
* @param {?number} timeOffset
* @return {!Promise.<shaka.hls.HlsParser.StreamInfo>}
* @private
*/
shaka.hls.HlsParser.prototype.createStreamInfoFromMediaTag_ =
function(tag, allCodecs, timeOffset) {
goog.asserts.assert(tag.name == 'EXT-X-MEDIA',
'Should only be called on media tags!');
// Check if the stream has already been created as part of another Variant
// and return it if it has.
if (this.mediaTagsToStreamInfosMap_[tag.id]) {
return Promise.resolve().then(function() {
return this.mediaTagsToStreamInfosMap_[tag.id];
}.bind(this));
}
var HlsParser = shaka.hls.HlsParser;
var type = HlsParser.getRequiredAttributeValue_(tag, 'TYPE').toLowerCase();
// Shaka recognizes content types 'audio', 'video' and 'text'.
// HLS 'subtitles' type needs to be mapped to 'text'.
var ContentType = shaka.util.ManifestParserUtils.ContentType;
if (type == 'subtitles') type = ContentType.TEXT;
var LanguageUtils = shaka.util.LanguageUtils;
var langAttr = tag.getAttribute('LANGUAGE');
var language = langAttr ? LanguageUtils.normalize(langAttr.value) : 'und';
var defaultAttr = tag.getAttribute('DEFAULT');
var autoselectAttr = tag.getAttribute('AUTOSELECT');
// TODO: Should we take into account some of the currently ignored attributes:
// FORCED, INSTREAM-ID, CHARACTERISTICS, CHANNELS?
// Attribute descriptions:
// https://tools.ietf.org/html/draft-pantos-http-live-streaming-20#section-4.3.4.1
var uri = HlsParser.getRequiredAttributeValue_(tag, 'URI');
var primary = !!defaultAttr || !!autoselectAttr;
return this.createStreamInfo_(uri, allCodecs, type, timeOffset, language,
primary).then(function(streamInfo) {
this.mediaTagsToStreamInfosMap_[tag.id] = streamInfo;
return streamInfo;
}.bind(this));
};
/**
* Parse EXT-X-STREAM-INF media tag into a Stream object.
*
* @param {!shaka.hls.Tag} tag
* @param {!Array.<!string>} allCodecs
* @param {!string} type
* @param {?number} timeOffset
* @return {!Promise.<shaka.hls.HlsParser.StreamInfo>}
* @private
*/
shaka.hls.HlsParser.prototype.createStreamInfoFromVariantTag_ =
function(tag, allCodecs, type, timeOffset) {
goog.asserts.assert(tag.name == 'EXT-X-STREAM-INF',
'Should only be called on media tags!');
var uri = shaka.hls.HlsParser.getRequiredAttributeValue_(tag, 'URI');
return this.createStreamInfo_(uri, allCodecs, type, timeOffset,
/* language */ 'und', /* primary */ false);
};
/**
* @param {!string} uri
* @param {!Array.<!string>} allCodecs
* @param {!string} type
* @param {?number} timeOffset
* @param {!string} language
* @param {boolean} primary
* @return {!Promise.<shaka.hls.HlsParser.StreamInfo>}
* @throws shaka.util.Error
* @private
*/
shaka.hls.HlsParser.prototype.createStreamInfo_ =
function(uri, allCodecs, type, timeOffset, language, primary) {
var Utils = shaka.hls.Utils;
var ContentType = shaka.util.ManifestParserUtils.ContentType;
var HlsParser = shaka.hls.HlsParser;
uri = Utils.constructAbsoluteUri(this.manifestUri_, uri);
return this.requestManifest_(uri).then(function(response) {
var playlistData = response.data;
var playlist = this.manifestTextParser_.parsePlaylist(playlistData,
response.uri);
if (playlist.type != shaka.hls.PlaylistType.MEDIA) {
// EXT-X-MEDIA tags should point to media playlists.
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.HLS_INVALID_PLAYLIST_HIERARCHY);
}
goog.asserts.assert(playlist.segments != null,
'Media playlist should have segments!');
// Time offset can be specified on either Master or Media Playlist.
// If Media Playlist provides it's own value, use that.
// Otherwise, use value from the Master Playlist. If no offset
// has been provided it will default to
// this.config_.hls.defaultTimeOffset.
var mediaPlaylistTimeOffset = this.getTimeOffset_(playlist);
timeOffset = mediaPlaylistTimeOffset || timeOffset;
var initSegmentReference = null;
if (type != ContentType.TEXT) {
initSegmentReference = this.createInitSegmentReference_(playlist);
}
var mediaSequenceTag = Utils.getFirstTagWithName(playlist.tags,
'EXT-X-MEDIA-SEQUENCE');
var startPosition = mediaSequenceTag ? Number(mediaSequenceTag.value) : 0;
var segments = this.createSegments_(playlist, startPosition);
this.presentationTimeline_.notifySegments(0, segments);
var duration =
segments[segments.length - 1].endTime - segments[0].startTime;
var presentationDuration = this.presentationTimeline_.getDuration();
if (presentationDuration == Infinity || presentationDuration < duration) {
this.presentationTimeline_.setDuration(duration);
}
var mimeType = this.guessMimeType_(type, segments[0].getUris()[0]);
var codecs = this.guessCodecs_(type, allCodecs);
var kind = undefined;
var ManifestParserUtils = shaka.util.ManifestParserUtils;
if (type == ManifestParserUtils.ContentType.TEXT)
kind = ManifestParserUtils.TextStreamKind.SUBTITLE;
// TODO: CLOSED-CAPTIONS requires the parsing of CEA-608 from the video.
var segmentIndex = new shaka.media.SegmentIndex(segments);
var drmTags = [];
playlist.segments.forEach(function(segment) {
var segmentKeyTags = Utils.filterTagsByName(segment.tags, 'EXT-X-KEY');
drmTags.push.apply(drmTags, segmentKeyTags);
});
var encrypted = false;
var drmInfos = [];
var keyId = null;
// TODO: may still need changes to support key rotation
drmTags.forEach(function(drmTag) {
var method = HlsParser.getRequiredAttributeValue_(drmTag, 'METHOD');
if (method != 'NONE') {
encrypted = true;
var keyFormat =
HlsParser.getRequiredAttributeValue_(drmTag, 'KEYFORMAT');
var drmParser =
shaka.hls.HlsParser.KEYFORMATS_TO_DRM_PARSERS_[keyFormat];
var drmInfo = drmParser ? drmParser(drmTag) : null;
if (drmInfo) {
if (drmInfo.keyIds.length) {
keyId = drmInfo.keyIds[0];
}
drmInfos.push(drmInfo);
} else {
shaka.log.warning('Unsupported HLS KEYFORMAT', keyFormat);
}
}
});
if (encrypted && !drmInfos.length) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.HLS_KEYFORMATS_NOT_SUPPORTED);
}
var stream = {
id: this.globalId_++,
createSegmentIndex: Promise.resolve.bind(Promise),
findSegmentPosition: segmentIndex.find.bind(segmentIndex),
getSegmentReference: segmentIndex.get.bind(segmentIndex),
initSegmentReference: initSegmentReference,
presentationTimeOffset: timeOffset || 0,
mimeType: mimeType,
codecs: codecs,
kind: kind,
encrypted: encrypted,
keyId: keyId,
language: language,
type: type,
primary: primary,
// TODO: trick mode
trickModeVideo: null,
containsEmsgBoxes: false,
frameRate: undefined,
width: undefined,
height: undefined,
bandwidth: undefined
};
this.streamsToIndexMap_[stream.id] = segmentIndex;
return {
stream: stream,
segmentIndex: segmentIndex,
drmInfos: drmInfos
};
}.bind(this));
};
/**
* @param {!shaka.hls.Playlist} playlist
* @return {shaka.media.InitSegmentReference}
* @private
* @throws {shaka.util.Error}
*/
shaka.hls.HlsParser.prototype.createInitSegmentReference_ = function(playlist) {
var Utils = shaka.hls.Utils;
var mapTags = Utils.filterTagsByName(playlist.tags, 'EXT-X-MAP');
// TODO: Support multiple map tags?
// For now, we don't support multiple map tags and will throw an error.
if (!mapTags.length) {
return null;
} else if (mapTags.length > 1) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.HLS_MULTIPLE_MEDIA_INIT_SECTIONS_FOUND);
}
// Map tag example: #EXT-X-MAP:URI="main.mp4",BYTERANGE="720@0"
var mapTag = mapTags[0];
var initUri = shaka.hls.HlsParser.getRequiredAttributeValue_(mapTag, 'URI');
var uri = Utils.constructAbsoluteUri(playlist.uri, initUri);
var startByte = 0;
var endByte = null;
var byterange = mapTag.getAttribute('BYTERANGE');
// If BYTERANGE attribute is not specified, the segment consists
// of the entire resourse.
if (byterange) {
var blocks = byterange.value.split('@');
var byteLength = Number(blocks[0]);
startByte = Number(blocks[1]);
endByte = startByte + byteLength - 1;
}
return new shaka.media.InitSegmentReference(function() { return [uri]; },
startByte,
endByte);
};
/**
* Parses shaka.hls.Segment objects into shaka.media.SegmentReferences.
*
* @param {!shaka.hls.Playlist} playlist
* @param {number} startPosition
* @return {!Array.<!shaka.media.SegmentReference>}
* @private
*/
shaka.hls.HlsParser.prototype.createSegments_ =
function(playlist, startPosition) {
var hlsSegments = playlist.segments;
var segments = [];
hlsSegments.forEach(function(segment) {
var Utils = shaka.hls.Utils;
var tags = segment.tags;
var uri = Utils.constructAbsoluteUri(playlist.uri, segment.uri);
// Start and end times
var extinfTag = this.getRequiredTag_(tags, 'EXTINF');
// EXTINF tag format is '#EXTINF:<duration>,[<title>]'.
// We're interested in the duration part.
var extinfValues = extinfTag.value.split(',');
var duration = Number(extinfValues[0]);
var startTime;
var index = hlsSegments.indexOf(segment);
if (index == 0) {
startTime = 0;
} else {
startTime = segments[index - 1].endTime;
}
var endTime = startTime + duration;
// StartByte and EndByte
var startByte = 0;
var endByte = null;
var byterange = Utils.getFirstTagWithName(tags, 'EXT-X-BYTERANGE');
// If BYTERANGE is not specified, the segment consists of the
// entire resourse.
if (byterange) {
var blocks = byterange.value.split('@');
var byteLength = Number(blocks[0]);
if (blocks[1]) {
startByte = Number(blocks[1]);
} else {
startByte = segments[index - 1].endByte;
}
endByte = startByte + byteLength - 1;
// Last segment has endByte of null to indicate that it extends
// to the end of the resource.
if (index == hlsSegments.length - 1)
endByte = null;
}
segments.push(new shaka.media.SegmentReference(startPosition + index,
startTime,
endTime,
function() { return [uri]; },
startByte,
endByte));
}.bind(this));
return segments;
};
/**
* Adjusts segment references of every stream of every variant to the
* timeline of the presentation.
* @param {!Array.<!shakaExtern.Variant>} variants
* @private
*/
shaka.hls.HlsParser.prototype.fitSegments_ = function(variants) {
variants.forEach(function(variant) {
var duration = this.presentationTimeline_.getDuration();
var video = variant.video;
var audio = variant.audio;
if (video && this.streamsToIndexMap_[video.id]) {
this.streamsToIndexMap_[video.id].fit(duration);
}
if (audio && this.streamsToIndexMap_[audio.id]) {
this.streamsToIndexMap_[audio.id].fit(duration);
}
}.bind(this));
};
/**
* Attempts to guess which codecs from the codecs list belong
* to a given content type.
*
* @param {!string} contentType
* @param {!Array.<!string>} codecs
* @return {string}
* @private
* @throws {shaka.util.Error}
*/
shaka.hls.HlsParser.prototype.guessCodecs_ = function(contentType, codecs) {
if (codecs.length == 1) {
return codecs[0];
}
var ContentType = shaka.util.ManifestParserUtils.ContentType;
if (contentType == ContentType.TEXT) {
return '';
}
var HlsParser = shaka.hls.HlsParser;
var formats = HlsParser.VIDEO_CODEC_FORMATS_;
if (contentType == ContentType.AUDIO)
formats = HlsParser.AUDIO_CODEC_FORMATS_;
for (var i = 0; i < formats.length; i++) {
for (var j = 0; j < codecs.length; j++) {
if (formats[i].test(codecs[j].trim())) {
return codecs[j].trim();
}
}
}
// Unable to guess codecs.
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.HLS_COULD_NOT_GUESS_CODECS,
codecs);
};
/**
* Attempts to guess stream's mime type based on content type and uri.
*
* @param {!string} contentType
* @param {!string} uri
* @return {!string}
* @private
* @throws {shaka.util.Error}
*/
shaka.hls.HlsParser.prototype.guessMimeType_ = function(contentType, uri) {
var ContentType = shaka.util.ManifestParserUtils.ContentType;
var blocks = uri.split('.');
var extension = blocks[blocks.length - 1];
if (contentType == ContentType.TEXT) {
// HLS only supports vtt at the moment.
return 'text/vtt';
}
var HlsParser = shaka.hls.HlsParser;
var map = HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_;
if (contentType == ContentType.VIDEO)
map = HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_;
var mimeType = map[extension];
if (!mimeType) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.HLS_COULD_NOT_GUESS_MIME_TYPE,
extension);
}
return mimeType;
};
/**
* Get presentation time offset of the playlist if it has been specified.
* Return null otherwise.
*
* @param {!shaka.hls.Playlist} playlist
* @return {?number}
* @private
*/
shaka.hls.HlsParser.prototype.getTimeOffset_ = function(playlist) {
var Utils = shaka.hls.Utils;
var startTag = Utils.getFirstTagWithName(playlist.tags, 'EXT-X-START');
// TODO: Should we respect the PRECISE flag?
// https://tools.ietf.org/html/draft-pantos-http-live-streaming-20#section-4.3.5.2
if (startTag)
return Number(shaka.hls.HlsParser.getRequiredAttributeValue_(
startTag, 'TIME-OFFSET'));
return this.config_.hls.defaultTimeOffset;
};
/**
* Find the attribute and returns its value.
* Throws an error if attribute was not found.
*
* @param {shaka.hls.Tag} tag
* @param {!string} attributeName
* @return {!string}
* @private
* @throws {shaka.util.Error}
*/
shaka.hls.HlsParser.getRequiredAttributeValue_ =
function(tag, attributeName) {
var attribute = tag.getAttribute(attributeName);
if (!attribute) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.HLS_REQUIRED_ATTRIBUTE_MISSING,
attributeName);
}
return attribute.value;
};
/**
* Returns a tag with a given name.
* Throws an error if tag was not found.
*
* @param {!Array.<shaka.hls.Tag>} tags
* @param {!string} tagName
* @return {!shaka.hls.Tag}
* @private
* @throws {shaka.util.Error}
*/
shaka.hls.HlsParser.prototype.getRequiredTag_ = function(tags, tagName) {
var Utils = shaka.hls.Utils;
var tag = Utils.getFirstTagWithName(tags, tagName);
if (!tag) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.HLS_REQUIRED_TAG_MISSING, tagName);
}
return tag;
};
/**
* @param {shakaExtern.Stream} stream
* @param {!string|undefined} width
* @param {!string|undefined} height
* @param {!string|undefined} frameRate
* @private
*/
shaka.hls.HlsParser.prototype.addVideoAttributes_ =
function(stream, width, height, frameRate) {
if (stream) {
stream.width = Number(width) || undefined;
stream.height = Number(height) || undefined;
stream.frameRate = Number(frameRate) || undefined;
}
};
/**
* Makes a network request for the manifest and returns a Promise
* with the resulting data.
*
* @param {!string} uri
* @return {!Promise.<!shakaExtern.Response>}
* @private
*/
shaka.hls.HlsParser.prototype.requestManifest_ = function(uri) {
var requestType = shaka.net.NetworkingEngine.RequestType.MANIFEST;
var request = shaka.net.NetworkingEngine.makeRequest(
[uri], this.config_.retryParameters);
return this.playerInterface_.networkingEngine.request(requestType, request);
};
/**
* A list of well-known video codecs formats.
*
* @const {!Array<!RegExp>}
* @private
*/
shaka.hls.HlsParser.VIDEO_CODEC_FORMATS_ = [
/^(avc)/,
/^(hvc)/,
/^(vp[8-9])$/,
/^(av1)$/,
/^(mp4v)/
];
/**
* A list of well-known audio codecs formats.
*
* @const {!Array<!RegExp>}
* @private
*/
shaka.hls.HlsParser.AUDIO_CODEC_FORMATS_ = [
/^(vorbis)/,
/^(opus)/,
/^(mp4a)/,
/^(ac-3)$/,
/^(ec-3)$/
];
/**
* @const {!Object<string, string>}
* @private
*/
shaka.hls.HlsParser.AUDIO_EXTENSIONS_TO_MIME_TYPES_ = {
'mp4': 'audio/mp4',
'm4s': 'audio/mp4',
'm4i': 'audio/mp4',
'm4a': 'audio/mp4',
// mpeg2 ts aslo uses video/ for audio: http://goo.gl/tYHXiS
'ts': 'video/mp2t'
};
/**
* @const {!Object<string, string>}
* @private
*/
shaka.hls.HlsParser.VIDEO_EXTENSIONS_TO_MIME_TYPES_ = {
'mp4': 'video/mp4',
'm4s': 'video/mp4',
'm4i': 'video/mp4',
'm4v': 'video/mp4',
'ts': 'video/mp2t'
};
/**
* @typedef {function(!shaka.hls.Tag):?shakaExtern.DrmInfo}
* @private
*/
shaka.hls.HlsParser.DrmParser_;
/**
* @param {!shaka.hls.Tag} drmTag
* @return {?shakaExtern.DrmInfo}
* @private
*/
shaka.hls.HlsParser.widevineDrmParser_ = function(drmTag) {
var HlsParser = shaka.hls.HlsParser;
var method = HlsParser.getRequiredAttributeValue_(drmTag, 'METHOD');
if (method != 'SAMPLE-AES-CENC') {
shaka.log.error(
'Widevine in HLS is only supported with SAMPLE-AES-CENC, not', method);
return null;
}
var uri = HlsParser.getRequiredAttributeValue_(drmTag, 'URI');
var parsedData = shaka.net.DataUriPlugin.parse(uri);
// The data encoded in the URI is a PSSH box to be used as init data.
var pssh = new Uint8Array(parsedData.data);
var drmInfo = shaka.util.ManifestParserUtils.createDrmInfo(
'com.widevine.alpha', [
{initDataType: 'cenc', initData: pssh}
]);
var keyId = drmTag.getAttribute('KEYID');
if (keyId) {
// This value begins with '0x':
goog.asserts.assert(keyId.value.substr(0, 2) == '0x',
'Incorrect KEYID format!');
// But the output does not contain the '0x':
drmInfo.keyIds = [keyId.value.substr(2).toLowerCase()];
}
return drmInfo;
};
/**
* @const {!Object.<string, shaka.hls.HlsParser.DrmParser_>}
* @private
*/
shaka.hls.HlsParser.KEYFORMATS_TO_DRM_PARSERS_ = {
/* TODO: https://github.com/google/shaka-player/issues/382
'com.apple.streamingkeydelivery':
shaka.hls.HlsParser.fairplayDrmParser_,
*/
'urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed':
shaka.hls.HlsParser.widevineDrmParser_
};
shaka.media.ManifestParser.registerParserByExtension(
'm3u8', shaka.hls.HlsParser);
shaka.media.ManifestParser.registerParserByMime(
'application/x-mpegurl', shaka.hls.HlsParser);