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index.js
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const m3u8 = require("@eyevinn/m3u8");
const debug = require("debug")("hls-vodtolive");
const verbose = require("debug")("hls-vodtolive-verbose");
const { findIndexReversed, fetchWithRetry, urlResolve, segToM3u8, findBottomSegItem, fixedNumber, inspectForVodTransition } = require("./utils.js");
class HLSVod {
/**
* Create an HLS VOD instance
* @param {string} vodManifestUri - the uri to the master manifest of the VOD
* @param {Object} splices - an array of ad splice objects
* @param {number} timeOffset - time offset as unix timestamp ms
* @param {number} startTimeOffset - start time offset in N ms from start
* @param {string} header - prepend the m3u8 playlist with this text
* @param {string} opts - other options
*/
constructor(vodManifestUri, splices, timeOffset, startTimeOffset, header, opts) {
this.masterManifestUri = vodManifestUri;
this.segments = {};
this.audioSegments = {};
this.subtitleSegments = {};
this.mediaSequences = [];
this.SEQUENCE_DURATION = process.env.SEQUENCE_DURATION ? process.env.SEQUENCE_DURATION : 60;
this.DUMMY_DEFAULT_SUBTITLE_GROUP_ID = "dummyDefaultSubtitleGroupId";
this.DUMMY_DEFAULT_SUBTITLE_LANGUAGE = "dummyDefaultSubtitleLanguage";
this.DEFAULT_SUBTITLE_GROUP_ID = "subtitles";
this.targetDuration = {};
this.targetAudioDuration = {};
this.targetSubtitleDuration = {};
this.previousVod = null;
this.usageProfile = [];
this.segmentsInitiated = {};
this.splices = splices || [];
this.timeOffset = timeOffset || null;
this.startTimeOffset = startTimeOffset || null;
this.usageProfileMapping = null;
this.usageProfileMappingRev = null;
this.discontinuities = {};
this.discontinuitiesAudio = {};
this.discontinuitiesSubtitle = {};
this.mediaSequenceValues = {};
this.mediaSequenceValuesAudio = {};
this.mediaSequenceValuesSubtitle = {};
this.rangeMetadata = null;
this.matchedBandwidths = {};
this.deltaTimes = [];
this.deltaTimesAudio = [];
this.deltaTimesSubtitle = [];
this.header = header;
this.lastUsedDiscSeq = null;
this.sequenceAlwaysContainNewSegments = false;
this.skipSerializeMediaSequences = false;
if (opts && opts.sequenceAlwaysContainNewSegments) {
this.sequenceAlwaysContainNewSegments = opts.sequenceAlwaysContainNewSegments;
}
if (opts && opts.forcedDemuxMode) {
this.forcedDemuxMode = opts.forcedDemuxMode;
}
if (opts && opts.dummySubtitleEndpoint) {
this.dummySubtitleEndpoint = opts.dummySubtitleEndpoint;
}
if (opts && opts.subtitleSliceEndpoint) {
this.subtitleSliceEndpoint = opts.subtitleSliceEndpoint;
}
if (opts && opts.shouldContainSubtitles) {
this.shouldContainSubtitles = opts.shouldContainSubtitles;
}
if (opts && opts.expectedSubtitleTracks) {
this.expectedSubtitleTracks = opts.expectedSubtitleTracks;
}
if (opts && opts.alwaysMapBandwidthByNearest) {
this.alwaysMapBandwidthByNearest = opts.alwaysMapBandwidthByNearest;
}
if (opts && opts.skipSerializeMediaSequences) {
this.skipSerializeMediaSequences = opts.skipSerializeMediaSequences;
}
this.videoSequencesCount = 0;
this.audioSequencesCount = 0;
this.defaultAudioGroupAndLang = null;
this.subtitleSequencesCount = 0;
this.mediaStartExcessTime = 0;
this.audioCodecsMap = {};
}
toJSON() {
const serialized = {
masterManifestUri: this.masterManifestUri,
segments: this.segments,
audioSegments: this.audioSegments,
subtitleSegments: this.subtitleSegments,
shouldContainSubtitles: this.shouldContainSubtitles,
expectedSubtitleTracks: this.expectedSubtitleTracks,
mediaSequences: this.skipSerializeMediaSequences ? null : this.mediaSequences,
SEQUENCE_DURATION: this.SEQUENCE_DURATION,
targetDuration: this.targetDuration,
targetAudioDuration: this.targetAudioDuration,
targetSubtitleDuration: this.targetSubtitleDuration,
previousVod: this.previousVod ? this.previousVod.toJSON() : null,
usageProfile: this.usageProfile,
segmentsInitiated: this.segmentsInitiated,
splices: this.splices,
timeOffset: this.timeOffset,
startTimeOffset: this.startTimeOffset,
usageProfileMapping: this.usageProfileMapping,
usageProfileMappingRev: this.usageProfileMappingRev,
discontinuities: this.discontinuities,
discontinuitiesAudio: this.discontinuitiesAudio,
discontinuitiesSubtitle: this.discontinuitiesSubtitle,
deltaTimes: this.deltaTimes,
deltaTimesAudio: this.deltaTimesAudio,
deltaTimesSubtitle: this.deltaTimesSubtitle,
header: this.header,
lastUsedDiscSeq: this.lastUsedDiscSeq,
mediaSequenceValues: this.mediaSequenceValues,
mediaSequenceValuesAudio: this.mediaSequenceValuesAudio,
mediaSequenceValuesSubtitle: this.mediaSequenceValuesSubtitle,
sequenceAlwaysContainNewSegments: this.sequenceAlwaysContainNewSegments,
forcedDemuxMode: this.forcedDemuxMode,
dummySubtitleEndpoint: this.dummySubtitleEndpoint,
subtitleSliceEndpoint: this.subtitleSliceEndpoint,
videoSequencesCount: this.skipSerializeMediaSequences ? 0 : this.videoSequencesCount,
audioSequencesCount: this.skipSerializeMediaSequences ? 0 : this.audioSequencesCount,
subtitleSequencesCount: this.skipSerializeMediaSequences ? 0 : this.subtitleSequencesCount,
mediaStartExcessTime: this.mediaStartExcessTime,
audioCodecsMap: this.audioCodecsMap,
alwaysMapBandwidthByNearest: this.alwaysMapBandwidthByNearest,
skipSerializeMediaSequences: this.skipSerializeMediaSequences
};
return JSON.stringify(serialized);
}
fromJSON(serialized) {
const de = JSON.parse(serialized);
this.masterManifestUri = de.masterManifestUri;
this.segments = de.segments;
this.audioSegments = de.audioSegments;
this.subtitleSegments = de.subtitleSegments;
this.shouldContainSubtitles = de.shouldContainSubtitles;
this.expectedSubtitleTracks = de.expectedSubtitleTracks;
this.mediaSequences = de.mediaSequences;
this.SEQUENCE_DURATION = de.SEQUENCE_DURATION;
this.targetDuration = de.targetDuration;
this.targetAudioDuration = de.targetAudioDuration;
this.targetSubtitleDuration = de.targetSubtitleDuration;
const prevVod = new HLSVod();
this.previousVod = null;
if (de.previousVod) {
this.previousVod = prevVod.fromJSON(de.previousVod);
}
this.usageProfile = de.usageProfile;
this.segmentsInitiated = de.segmentsInitiated;
this.splices = de.splices;
this.timeOffset = de.timeOffset;
this.startTimeOffset = de.startTimeOffset;
this.usageProfileMapping = de.usageProfileMapping;
this.usageProfileMappingRev = de.usageProfileMappingRev;
this.discontinuities = de.discontinuities;
this.discontinuitiesAudio = de.discontinuitiesAudio;
this.discontinuitiesSubtitle = de.discontinuitiesSubtitle;
this.deltaTimes = de.deltaTimes;
this.deltaTimesAudio = de.deltaTimesAudio;
this.deltaTimesSubtitle = de.deltaTimesSubtitle;
this.header = de.header;
if (de.lastUsedDiscSeq) {
this.lastUsedDiscSeq = de.lastUsedDiscSeq;
}
this.mediaSequenceValues = de.mediaSequenceValues;
this.mediaSequenceValuesAudio = de.mediaSequenceValuesAudio;
this.mediaSequenceValuesSubtitle = de.mediaSequenceValuesSubtitle;
this.sequenceAlwaysContainNewSegments = de.sequenceAlwaysContainNewSegments;
this.forcedDemuxMode = de.forcedDemuxMode;
this.dummySubtitleEndpoint = de.dummySubtitleEndpoint;
this.subtitleSliceEndpoint = de.subtitleSliceEndpoint;
this.videoSequencesCount = de.videoSequencesCount;
this.audioSequencesCount = de.audioSequencesCount;
this.subtitleSequencesCount = de.subtitleSequencesCount
this.mediaStartExcessTime = de.mediaStartExcessTime;
this.audioCodecsMap = de.audioCodecsMap;
this.alwaysMapBandwidthByNearest = de.alwaysMapBandwidthByNearest;
this.skipSerializeMediaSequences = de.skipSerializeMediaSequences;
}
/**
* Load and parse the HLS VOD
*/
load(_injectMasterManifest, _injectMediaManifest, _injectAudioManifest, _injectSubtitleManifest) {
return new Promise((resolve, reject) => {
const parser = m3u8.createStream();
parser.on("m3u", (m3u) => {
let mediaManifestPromises = [];
let audioManifestPromises = [];
let subtitleManifestPromises = [];
let baseUrl;
const m = this.masterManifestUri.match("^(.*)/.*?$");
if (m) {
baseUrl = m[1] + "/";
}
const HAS_AUDIO_DEFAULTS = this.defaultAudioGroupAndLang === null ? false : true;
if (!this.alwaysMapBandwidthByNearest && this.previousVod && this.previousVod.getBandwidths().length === m3u.items.StreamItem.length) {
debug(`Previous VOD bandwidths matches amount of current. A mapping is possible`);
const previousBandwidths = this.previousVod.getBandwidths().sort((a, b) => a - b);
this.usageProfileMapping = {};
this.usageProfileMappingRev = {};
const bandwidths = m3u.items.StreamItem.sort((a, b) => {
return a.get("bandwidth") - b.get("bandwidth");
}).map((v) => v.get("bandwidth"));
debug(`${previousBandwidths} : ${bandwidths}`);
for (let i = 0; i < previousBandwidths.length; i++) {
this.usageProfileMapping[previousBandwidths[i]] = bandwidths[i] + "";
this.usageProfileMappingRev[bandwidths[i]] = previousBandwidths[i];
}
}
for (let i = 0; i < m3u.items.StreamItem.length; i++) {
const streamItem = m3u.items.StreamItem[i];
let mediaManifestUrl = urlResolve(baseUrl, streamItem.get("uri"));
if (streamItem.get("bandwidth")) {
let usageProfile = {
bw: streamItem.get("bandwidth"),
};
if (streamItem.get("resolution")) {
usageProfile.resolution = streamItem.get("resolution")[0] + "x" + streamItem.get("resolution")[1];
}
if (streamItem.get("codecs")) {
usageProfile.codecs = streamItem.get("codecs");
}
this.usageProfile.push(usageProfile);
// Do not add if it is a variant included in an audio group as it will be loaded and parsed separate
if (!m3u.items.MediaItem.find((mediaItem) => mediaItem.get("type") === "AUDIO" && mediaItem.get("uri") == streamItem.get("uri"))) {
if (streamItem.get("codecs") !== "mp4a.40.2") {
mediaManifestPromises.push(this._loadMediaManifest(mediaManifestUrl, streamItem.get("bandwidth"), _injectMediaManifest));
}
}
}
}
Promise.all(mediaManifestPromises).then(() => {
let audioGroups = {};
let subtitleGroups = {};
for (let i = 0; i < m3u.items.StreamItem.length; i++) {
const streamItem = m3u.items.StreamItem[i];
if (streamItem.get("audio")) {
let audioGroupId = streamItem.get("audio");
if (!HAS_AUDIO_DEFAULTS && !this.audioSegments[audioGroupId]) {
this.audioSegments[audioGroupId] = {};
}
const audioCodecs = streamItem.get("codecs").split(",").find(c => {
return c.match(/^mp4a/) || c.match(/^ac-3/) || c.match(/^ec-3/);
});
debug(`Lookup media item for '${audioGroupId}'`);
// # Needed for the case when loading after another VOD.
const previousVODLanguages = HAS_AUDIO_DEFAULTS
? Object.keys(this.audioSegments[this.defaultAudioGroupAndLang.audioGroupId])
: Object.keys(this.audioSegments[audioGroupId]);
let audioGroupItems = m3u.items.MediaItem.filter((item) => {
return item.get("type") === "AUDIO" && item.get("group-id") === audioGroupId;
});
// # Find all langs amongst the mediaItems that have this group id.
// # It extracts each mediaItems language attribute value.
// # ALSO initialize in this.audioSegments a lang. property who's value is an array [{seg1}, {seg2}, ...].
let audioLanguages = audioGroupItems.map((item) => {
let itemLang;
if (!item.get("language")) {
itemLang = item.get("name");
} else {
itemLang = item.get("language");
}
// Initialize lang. in new group.
if (!HAS_AUDIO_DEFAULTS && !this.audioSegments[audioGroupId][itemLang]) {
this.audioSegments[audioGroupId][itemLang] = [];
}
if (!this.audioCodecsMap[audioCodecs]) {
this.audioCodecsMap[audioCodecs] = {};
}
const itemChannels = item.get("channels") ? item.get("channels") : "2";
this.audioCodecsMap[audioCodecs][itemChannels] = audioGroupId;
return itemLang;
});
// # Inject "default" language's segments to every new language relative to previous VOD.
// # For the case when this is a VOD following another, every language new or old should
// # start with some segments from the previous VOD's last sequence.
const newLanguages = audioLanguages.filter((lang) => {
return !previousVODLanguages.includes(lang);
});
// # Only inject if there were prior tracks.
if (previousVODLanguages.length > 0 && !HAS_AUDIO_DEFAULTS) {
for (let i = 0; i < newLanguages.length; i++) {
const newLanguage = newLanguages[i];
const defaultLanguage = this._getFirstAudioLanguageWithSegments(audioGroupId);
this.audioSegments[audioGroupId][newLanguage] = [...this.audioSegments[audioGroupId][defaultLanguage]];
}
}
// # Need to clean up langs. loaded from prev. VOD that current VOD doesn't have.
// # Necessary, for the case when getLiveMediaSequenceAudioSegments() tries to
// # access an audioGroup's language that the current VOD never had. A False-Positive.
if (!HAS_AUDIO_DEFAULTS) {
let allLangs = Object.keys(this.audioSegments[audioGroupId]);
let toRemove = [];
allLangs.map((junkLang) => {
if (!audioLanguages.includes(junkLang)) {
toRemove.push(junkLang);
}
});
toRemove.map((junkLang) => {
delete this.audioSegments[audioGroupId][junkLang];
});
}
// # For each lang, find the lang playlist uri and do _loadAudioManifest() on it.
for (let j = 0; j < audioLanguages.length; j++) {
let audioLang = audioLanguages[j];
let audioUri = audioGroupItems[j].get("uri");
if (!audioUri) {
//# if mediaItems dont have uris
let audioVariant = m3u.items.StreamItem.find((item) => {
return !item.get("resolution") && item.get("audio") === audioGroupId;
});
if (audioVariant) {
audioUri = audioVariant.get("uri");
}
}
if (audioUri) {
let audioManifestUrl = urlResolve(baseUrl, audioUri);
if (!audioGroups[audioGroupId]) {
audioGroups[audioGroupId] = {};
}
// # Prevents 'loading' an audio track with same GroupID and LANG.
// # otherwise it just would've loaded OVER the latest occurrent of the LANG in GroupID.
if (!audioGroups[audioGroupId][audioLang]) {
let targetGroup = audioGroupId;
let targetLang = audioLang;
audioGroups[audioGroupId][audioLang] = true;
if (HAS_AUDIO_DEFAULTS) {
targetGroup = this.defaultAudioGroupAndLang.audioGroupId;
targetLang = this.defaultAudioGroupAndLang.audioLanguage;
debug(`Loading Audio manifest onto Default GroupID=${targetGroup} and Language=${targetLang}`);
}
audioManifestPromises.push(this._loadAudioManifest(audioManifestUrl, targetGroup, targetLang, _injectAudioManifest));
} else {
debug(`Audio manifest for language "${audioLang}" from '${audioGroupId}' in already loaded, skipping`);
}
} else {
debug(`No media item for '${audioGroupId}' in "${audioLang}" was found, skipping`);
}
}
} else if (this.forcedDemuxMode) {
reject(new Error("The vod is not a demux vod"));
}
if (this.shouldContainSubtitles) {
if (!this.subtitleSliceEndpoint) {
reject(new Error("Missing subtitle slice URL"));
continue;
}
if (!this.expectedSubtitleTracks) {
reject(new Error("There are no expected subtitle tracks"));
continue;
}
if (this.shouldContainSubtitles) {
if (!this.subtitleSegments[this.DUMMY_DEFAULT_SUBTITLE_GROUP_ID]) {
this.subtitleSegments[this.DUMMY_DEFAULT_SUBTITLE_GROUP_ID] = {};
}
if (!this.subtitleSegments[this.DUMMY_DEFAULT_SUBTITLE_GROUP_ID][this.DUMMY_DEFAULT_SUBTITLE_LANGUAGE]) {
this.subtitleSegments[this.DUMMY_DEFAULT_SUBTITLE_GROUP_ID][this.DUMMY_DEFAULT_SUBTITLE_LANGUAGE] = [];
}
}
if (!this.subtitleSegments[this.DEFAULT_SUBTITLE_GROUP_ID]) {
this.subtitleSegments[this.DEFAULT_SUBTITLE_GROUP_ID] = {};
}
for (let i = 0; i < this.expectedSubtitleTracks.length; i++) {
const element = this.expectedSubtitleTracks[i];
if (!this.subtitleSegments[this.DEFAULT_SUBTITLE_GROUP_ID][element.language]) {
this.subtitleSegments[this.DEFAULT_SUBTITLE_GROUP_ID][element.language] = [];
}
}
if (streamItem.get("subtitles")) {
if (!subtitleGroups[this.DEFAULT_SUBTITLE_GROUP_ID]) {
subtitleGroups[this.DEFAULT_SUBTITLE_GROUP_ID] = {};
}
let subtitleGroupId = streamItem.get("subtitles");
let subtitleGroupItems = m3u.items.MediaItem.filter((item) => {
return item.get("type") === "SUBTITLES" && item.get("group-id") === subtitleGroupId;
});
// # Find all langs amongst the mediaItems that have this group id.
// # It extracts each mediaItems language attribute value.
// # ALSO initialize in this.subtitleSegments a lang. property who's value is an array [{seg1}, {seg2}, ...].
let subtitleLanguages = subtitleGroupItems.map((item) => {
let itemLang;
if (!item.get("language")) {
itemLang = item.get("name");
} else {
itemLang = item.get("language");
}
for (let index = 0; index < this.expectedSubtitleTracks.length; index++) {
const element = this.expectedSubtitleTracks[index];
if (element.language.toLowerCase() === itemLang.toLowerCase() || element.name.toLowerCase() === itemLang.toLowerCase()) {
return element.language;
}
}
return;
}).filter((item) => item !== undefined);
// # For each lang, find the lang playlist uri and do _loadSubtitleManifest() on it.
for (let j = 0; j < subtitleLanguages.length; j++) {
let subtitleLang = subtitleLanguages[j];
let subtitleUri = subtitleGroupItems[j].get("uri");
if (!subtitleUri) {
//# if mediaItems dont have uris
let subtitleVariant = m3u.items.StreamItem.find((item) => {
return !item.get("resolution") && item.get("subtitle") === subtitleGroupId;
});
if (subtitleVariant) {
subtitleUri = subtitleVariant.get("uri");
}
}
if (subtitleUri) {
let subtitleManifestUrl = urlResolve(baseUrl, subtitleUri);
// # Prevents 'loading' an subtitle track with same GroupID and LANG.
// # otherwise it just would've loaded OVER the latest occurrent of the LANG in GroupID.
if (!subtitleGroups[this.DEFAULT_SUBTITLE_GROUP_ID][subtitleLang]) {
let targetGroup = this.DEFAULT_SUBTITLE_GROUP_ID;
let targetLang = subtitleLang;
subtitleGroups[this.DEFAULT_SUBTITLE_GROUP_ID][subtitleLang] = true;
subtitleManifestPromises.push(this._loadSubtitleManifest(subtitleManifestUrl, targetGroup, targetLang, _injectSubtitleManifest));
} else {
debug(`Subtitle manifest for language "${this.DEFAULT_SUBTITLE_GROUP_ID}" from '${subtitleGroupId}' in already loaded, skipping`);
}
} else {
debug(`No media item for '${subtitleGroupId}' in "${subtitleLang}" was found, skipping`);
}
}
} else if (this.shouldContainSubtitles) {
if (!this.dummySubtitleEndpoint) {
reject(new Error("Loaded VOD does not contain subtitles and there is no dummy subtitle segment URL configured"));
}
if (!this.expectedSubtitleTracks) {
reject(new Error("There are no expected subtitle tracks"));
}
if (!this.subtitleSliceEndpoint) {
reject(new Error("Missing subtitle slice URL"));
}
}
}
}
debug("Codec to Audio Group Id mapping");
debug(this.audioCodecsMap);
return Promise.all(audioManifestPromises.concat(subtitleManifestPromises))
}).then(this._cleanupUnused.bind(this))
.then(this._createMediaSequences.bind(this))
.then(resolve)
.catch((err) => {
debug("Error loading VOD: Need to cleanup");
this._cleanupOnFailure();
reject(err);
});
});
parser.on("error", (err) => {
reject(err);
});
if (!_injectMasterManifest) {
fetchWithRetry(this.masterManifestUri, null, 5, 1000, 5000, debug)
.then((res) => {
if (res.status === 200) {
res.body.pipe(parser);
} else {
throw new Error(res.status + ":: status code error trying to retrieve master manifest " + this.masterManifestUri);
}
})
.catch(reject);
} else {
const stream = _injectMasterManifest();
stream.pipe(parser);
stream.on("error", (err) => reject(err));
}
});
}
/**
* Load and parse the HLS VOD where the first media sequences
* contains the end sequences of the previous VOD
*
* @param {HLSVod} previousVod - the previous VOD to concatenate to
*/
loadAfter(previousVod, _injectMasterManifest, _injectMediaManifest, _injectAudioManifest, _injectSubtitleManifest) {
debug(`Initializing Load VOD After VOD...`);
return new Promise((resolve, reject) => {
this.previousVod = previousVod;
try {
this._loadPrevious();
this.load(_injectMasterManifest, _injectMediaManifest, _injectAudioManifest, _injectSubtitleManifest)
.then(() => {
this.releasePreviousVod();
resolve();
})
.catch((err) => {
this.releasePreviousVod();
reject(err);
});
} catch (exc) {
reject(exc);
}
});
}
/**
* Removes all segments that come before or after a specified media sequence.
* Then adds the new additional segments in front or behind.
* It finally creates new media sequences with the updated collection of segments.
*
* @param {number} mediaSeqNo The media Sequence index that is the live index.
* @param {object} additionalSegments New group of segments to merge with a possible subset of this.segments
* @param {object} additionalAudioSegments New group of audio segments to merge with a possible subset of this.segments
* @param {boolean} insertAfter Whether the additional segments are to be added in front of the live index or behind
* @returns A promise that new Media Sequences have been made
*/
reload(mediaSeqNo, additionalSegments, additionalAudioSegments, insertAfter) {
return new Promise((resolve, reject) => {
const allBandwidths = this.getBandwidths();
if (!insertAfter) {
// First handle case where we reload segments with Program Date time positions.
let newTimeOffset = this._getLastTimelinePositionVideo(additionalSegments);
let newTimeOffsetAudio = this._getLastTimelinePositionAudio(additionalAudioSegments);
// If there is anything to slice
if (mediaSeqNo > 0) {
let targetUri = "";
let size = this.mediaSequences[mediaSeqNo].segments[allBandwidths[0]].length;
for (let idx = size - 1; idx >= 0; idx--) {
const segItem = this.mediaSequences[mediaSeqNo].segments[allBandwidths[0]][idx];
if (segItem.uri) {
targetUri = segItem.uri;
break;
}
}
let targetPos = 0;
for (let i = mediaSeqNo; i < this.segments[allBandwidths[0]].length; i++) {
if (this.segments[allBandwidths[0]][i].uri === targetUri) {
targetPos = i;
break;
}
}
allBandwidths.forEach((bw) => (this.segments[bw] = this.segments[bw].slice(targetPos)));
}
if (!this._isEmpty(this.audioSegments) && additionalAudioSegments) {
const groupIds = this.getAudioGroups();
const lang = this.getAudioLangsForAudioGroup(groupIds[0])[0];
if (mediaSeqNo > 0) {
let targetUri = "";
let size = this.mediaSequences[mediaSeqNo].audioSegments[groupIds[0]][lang].length;
for (let idx = size - 1; idx >= 0; idx--) {
const segItem = this.mediaSequences[mediaSeqNo].audioSegments[groupIds[0]][lang][idx];
if (segItem.uri) {
targetUri = segItem.uri;
break;
}
}
let targetPos = 0;
for (let i = mediaSeqNo; i < this.audioSegments[groupIds[0]][lang].length; i++) {
if (this.audioSegments[groupIds[0]][lang][i].uri === targetUri) {
targetPos = i;
break;
}
}
for (let i = 0; i < groupIds.length; i++) {
const groupId = groupIds[i];
const langs = this.getAudioLangsForAudioGroup(groupId);
for (let j = 0; j < langs.length; j++) {
const lang = langs[j];
this.audioSegments[groupId][lang] = this.audioSegments[groupId][lang].slice(targetPos);
}
}
}
}
// Find nearest BW in SFL and prepend them to the corresponding segments bandwidth
allBandwidths.forEach((bw) => {
if (newTimeOffset > 0) {
let totalTimelinePos = 0;
for (let i = 0; i < this.segments[bw].length; i++) {
const segment = this.segments[bw][i];
if (segment.duration) {
totalTimelinePos += segment.duration * 1000;
this.segments[bw][i].timelinePosition = newTimeOffset + totalTimelinePos;
}
}
}
let nearestBw = this._getNearestBandwidthInList(bw, Object.keys(additionalSegments));
this.segments[bw] = additionalSegments[nearestBw].concat(this.segments[bw]);
});
if (!this._isEmpty(this.audioSegments) && additionalAudioSegments) {
const groupIdsInVod = this.getAudioGroups();
const groupIdsInSegments = Object.keys(additionalAudioSegments);
for (let i = 0; i < groupIdsInSegments.length; i++) {
let groupIdForVod = groupIdsInSegments[i];
let indexOfGroupId = groupIdsInVod.indexOf(groupIdsInSegments[i]);
if (indexOfGroupId < 0) {
groupIdForVod = groupIdsInVod[0];
} else {
groupIdForVod = groupIdsInVod[indexOfGroupId];
}
const langsInVod = this.getAudioLangsForAudioGroup(groupIdForVod);
const langsInSegment = Object.keys(additionalAudioSegments[groupIdsInSegments[i]]);
for (let j = 0; j < langsInSegment.length; j++) {
let langForVod = langsInSegment[j];
let indexOfLang = langsInVod.indexOf(langsInSegment[j]);
if (indexOfLang < 0) {
langForVod = langsInVod[0];
} else {
langForVod = langsInVod[indexOfLang];
}
if (newTimeOffsetAudio > 0) {
let totalTimelinePos = 0;
for (let i = 0; i < this.audioSegments[groupIdForVod][langForVod].length; i++) {
const segment = this.audioSegments[groupIdForVod][langForVod][i];
if (segment.duration) {
totalTimelinePos += segment.duration * 1000;
this.audioSegments[groupIdForVod][langForVod][i].timelinePosition = newTimeOffsetAudio + totalTimelinePos;
}
}
}
this.audioSegments[groupIdForVod][langForVod] = additionalAudioSegments[groupIdsInSegments[i]][langsInSegment[j]].concat(
this.audioSegments[groupIdForVod][langForVod]
);
}
}
}
} else {
// First handle case where we reload segments with Program Date time positions.
let newTimeOffset = this._getLastTimelinePositionVideo(this.segments);
let newTimeOffsetAudio = this._getLastTimelinePositionAudio(this.audioSegments);
// Slice Video segments
if (mediaSeqNo >= 0) {
let size = this.mediaSequences[mediaSeqNo].segments[allBandwidths[0]].length;
let targetUri = this.mediaSequences[mediaSeqNo].segments[allBandwidths[0]][0].uri;
let targetPos = 0;
for (let i = mediaSeqNo; i < this.segments[allBandwidths[0]].length; i++) {
if (this.segments[allBandwidths[0]][i].uri === targetUri) {
targetPos = i;
break;
}
}
allBandwidths.forEach((bw) => (this.segments[bw] = this.segments[bw].slice(targetPos, targetPos + size)));
}
// Slice Audio segments
if (!this._isEmpty(this.audioSegments) && additionalAudioSegments) {
const groupIds = this.getAudioGroups();
const lang = this.getAudioLangsForAudioGroup(groupIds[0])[0];
if (mediaSeqNo >= 0) {
let size = this.mediaSequences[mediaSeqNo].audioSegments[groupIds[0]][lang].length;
let targetUri = this.mediaSequences[mediaSeqNo].audioSegments[groupIds[0]][lang][0].uri;
let targetPos = 0;
for (let i = mediaSeqNo; i < this.audioSegments[groupIds[0]][lang].length; i++) {
if (this.audioSegments[groupIds[0]][lang][i].uri === targetUri) {
targetPos = i;
break;
}
}
for (let i = 0; i < groupIds.length; i++) {
const groupId = groupIds[i];
const langs = this.getAudioLangsForAudioGroup(groupId);
for (let j = 0; j < langs.length; j++) {
const lang = langs[j];
this.audioSegments[groupId][lang] = this.audioSegments[groupId][lang].slice(targetPos, targetPos + size);
}
}
}
}
// Update Program Date Time positions in the additional segments video
if (newTimeOffset > 0) {
const allAdditionalSegmentsBandwidths = Object.keys(additionalSegments);
allAdditionalSegmentsBandwidths.forEach((bw) => {
let totalTimelinePos = 0;
for (let i = 0; i < additionalSegments[bw].length; i++) {
const segment = additionalSegments[bw][i];
if (segment.duration) {
totalTimelinePos += segment.duration * 1000;
additionalSegments[bw][i].timelinePosition = newTimeOffset + totalTimelinePos;
}
}
});
}
allBandwidths.forEach((bw) => {
let nearestBw = this._getNearestBandwidthInList(bw, Object.keys(additionalSegments));
this.segments[bw] = this.segments[bw].concat(additionalSegments[nearestBw]);
});
if (!this._isEmpty(this.audioSegments) && additionalAudioSegments) {
const groupIdsInVod = this.getAudioGroups();
const groupIdsInSegments = Object.keys(additionalAudioSegments);
for (let i = 0; i < groupIdsInSegments.length; i++) {
let groupIdForVod = groupIdsInSegments[i];
let indexOfGroupId = groupIdsInVod.indexOf(groupIdsInSegments[i]);
if (indexOfGroupId < 0) {
groupIdForVod = groupIdsInVod[0];
} else {
groupIdForVod = groupIdsInVod[indexOfGroupId];
}
const langsInVod = this.getAudioLangsForAudioGroup(groupIdForVod);
const langsInSegment = Object.keys(additionalAudioSegments[groupIdsInSegments[i]]);
for (let j = 0; j < langsInSegment.length; j++) {
let langForVod = langsInSegment[j];
let indexOfLang = langsInVod.indexOf(langsInSegment[j]);
if (indexOfLang < 0) {
langForVod = langsInVod[0];
} else {
langForVod = langsInVod[indexOfLang];
}
if (newTimeOffsetAudio > 0) {
let totalTimelinePos = 0;
for (let x = 0; x < additionalAudioSegments[groupIdsInSegments[i]][langsInSegment[j]].length; x++) {
const segment =additionalAudioSegments[groupIdsInSegments[i]][langsInSegment[j]][x];
if (segment.duration) {
totalTimelinePos += segment.duration * 1000;
additionalAudioSegments[groupIdsInSegments[i]][langsInSegment[j]][x].timelinePosition = newTimeOffsetAudio + totalTimelinePos;
}
}
}
this.audioSegments[groupIdForVod][langForVod] = this.audioSegments[groupIdForVod][langForVod].concat(
additionalAudioSegments[groupIdsInSegments[i]][langsInSegment[j]]
);
}
}
}
}
// Clean up/Reset HLSVod data since we are going to create new data
this.mediaSequences = [];
this.audioSequences = [];
this.mediaSequenceValues = {};
this.mediaSequenceValuesAudio = {};
this.discontinuities = {};
this.discontinuitiesAudio = {};
this.deltaTimes = [];
this.deltaTimesAudio = [];
try {
this._createMediaSequences()
.then(() => {
resolve();
})
.catch((err) => {
reject(err);
});
} catch (exc) {
reject(exc);
}
});
}
/**
* Add metadata timed for this VOD
*
* @param {key} key - EXT-X-DATERANGE attribute key
* @param {*} value
*/
addMetadata(key, value) {
if (this.rangeMetadata === null) {
this.rangeMetadata = {};
}
this.rangeMetadata[key] = value;
}
/**
* Retrieve master manifest Uri for this VOD
*/
getVodUri() {
return this.masterManifestUri;
}
/**
* Get all segments (duration, uri) for a specific media sequence
*
* @param {number} seqIdx - media sequence index (first is 0)
*/
getLiveMediaSequenceSegments(seqIdx) {
return this.mediaSequences[seqIdx].segments;
}
/**
* Get all audio segments (duration, uri) for a specific media sequence
*
* @param {number} seqIdx - media sequence index (first is 0)
*/
getLiveAudioSequenceSegments(seqIdx) {
return this.mediaSequences[seqIdx].audioSegments;
}
/**
* Get all segments (duration, uri)
*
*/
getMediaSegments() {
return this.segments;
}
getAudioSegments() {
return this.audioSegments;
}
/**
* Get all audio segments (duration, uri) for a specific media sequence based on audio group and lang
*
* @param {string} audioGroupId - audio group Id
* @param {string} audioLanguage - audio language
* @param {number} seqIdx - media sequence index (first is 0)
*/
getLiveMediaSequenceAudioSegments(audioGroupId, audioLanguage, seqIdx) {
try {
// # When language not found, return segments from first language.
if (!this.mediaSequences[seqIdx].audioSegments[audioGroupId]) {
audioGroupId = this._getFirstAudioGroupWithSegments();
if (!audioGroupId) {
return [];
}
}
if (!this.mediaSequences[seqIdx].audioSegments[audioGroupId][audioLanguage]) {
const fallbackLang = this._getFirstAudioLanguageWithSegments(audioGroupId);
return this.mediaSequences[seqIdx].audioSegments[audioGroupId][fallbackLang];
}
return this.mediaSequences[seqIdx].audioSegments[audioGroupId][audioLanguage];
} catch (err) {
console.error(err);
return [];
}
}
/**
* Get all subtitle segments (duration, uri) for a specific media sequence
*
* @param {string} subtitleGroupId - subtitle group Id
* @param {string} subtitleLanguage - subtitle language
* @param {number} seqIdx - media sequence index (first is 0)
*/
getLiveMediaSequenceSubtitleSegments(subtitleGroupId, subtitleLanguage, seqIdx) {
try {
// # When language not found, return segments from default language.
if (!this.mediaSequences[seqIdx].subtitleSegments[subtitleGroupId]) {
subtitleGroupId = this.DUMMY_DEFAULT_SUBTITLE_GROUP_ID;
}
if (!this.mediaSequences[seqIdx].subtitleSegments[subtitleGroupId][subtitleLanguage]) {
const fallbackLang = this.DUMMY_DEFAULT_SUBTITLE_LANGUAGE;
subtitleGroupId = this.DUMMY_DEFAULT_SUBTITLE_GROUP_ID;
return this.mediaSequences[seqIdx].subtitleSegments[subtitleGroupId][fallbackLang];
}
return this.mediaSequences[seqIdx].subtitleSegments[subtitleGroupId][subtitleLanguage];
} catch (err) {
console.error(err);
return [];
}
}
/**
* Get the available bandwidths for this VOD
*/
getBandwidths() {
return Object.keys(this.segments);
}
getAudioGroups() {
return Object.keys(this.audioSegments);
}
getAudioLangsForAudioGroup(groupId) {
return Object.keys(this.audioSegments[groupId]);
}
getAudioGroupIdForCodecs(audioCodecs, channels) {
// {
// "ec-3": [
// { "6": "audio1" }
// ]
// }
let audioGroupId;
if (!this.audioCodecsMap[audioCodecs]) {
return undefined;
}
Object.keys(this.audioCodecsMap[audioCodecs]).map(channelsKey => {
if (channelsKey === channels) {
audioGroupId = this.audioCodecsMap[audioCodecs][channelsKey];
}
});
return audioGroupId;
}
getAudioCodecsAndChannelsForGroupId(groupId) {
let audioCodecs;
let channels;
Object.keys(this.audioCodecsMap).map(codecKey => {
Object.keys(this.audioCodecsMap[codecKey]).map(channelsKey => {
if (this.audioCodecsMap[codecKey][channelsKey] === groupId) {
audioCodecs = codecKey;
channels = channelsKey;
}
});
});
return [audioCodecs, channels];
}
getSubtitleGroups(all = false) {
return Object.keys(this.subtitleSegments).filter(groupId => groupId !== this.DUMMY_DEFAULT_SUBTITLE_GROUP_ID || all);
}
getSubtitleLangsForSubtitleGroup(groupId) {
return Object.keys(this.subtitleSegments[groupId]);
}
/**
* Get the number of media sequences for this VOD
*/
getLiveMediaSequencesCount(media = "video") {
if (media === "audio") {
return this.audioSequencesCount;
} else if (media === "subtitle") {
return this.subtitleSequencesCount;
}
return this.videoSequencesCount;
}
/**
* Get the media-sequence value for the last media sequence of this VOD
*/
getLastSequenceMediaSequenceValue() {
const end = Object.keys(this.mediaSequenceValues).length - 1;
return this.mediaSequenceValues[end];
}
/**
* Get the media-sequence value for the last audio media sequence of this VOD
*/
getLastSequenceMediaSequenceValueAudio() {
const end = Object.keys(this.mediaSequenceValuesAudio).length - 1;
return this.mediaSequenceValuesAudio[end];
}
/**
* Get the media-sequence value for the last subtitle media sequence of this VOD
*/
getLastSequenceMediaSequenceValueSubtitle() {
const end = Object.keys(this.mediaSequenceValuesSubtitle).length - 1;
return this.mediaSequenceValuesSubtitle[end];
}
/**
* Get the HLS live media sequence for a specific media sequence and bandwidth
*
* @param {number} offset - add this offset to all media sequences in the EXT-X-MEDIA-SEQUENCE tag
* @param {string} bandwidth
* @param {number} seqIdx
* @param {number} discOffset - add this offset to all discontinuity sequences in the EXT-X-DISCONTINUITY-SEQUENCE tag
* @param {number} padding - add extra seconds on the EXT-X-TARGETDURATION
* @param {number} forceTargetDuration - enforce a fixed EXT-X-TARGETDURATION
*/
getLiveMediaSequences(offset, bandwidth, seqIdx, discOffset, padding, forceTargetDuration) {
const bw = this._getNearestBandwidthWithInitiatedSegments(bandwidth);
let targetDuration = this._determineTargetDuration(this.mediaSequences[seqIdx].segments[bw]);
if (padding) {
targetDuration += padding;
}
if (forceTargetDuration) {
if (targetDuration > forceTargetDuration) {
debug(`WARN: enforced target duration ${forceTargetDuration}s is smaller than determined target duration ${targetDuration}s`);
}
targetDuration = forceTargetDuration;
}
let m3u8 = "#EXTM3U\n";
m3u8 += "#EXT-X-VERSION:6\n";
if (this.header) {
m3u8 += this.header;
}
const seqStep = this.mediaSequenceValues[seqIdx];
m3u8 += "#EXT-X-INDEPENDENT-SEGMENTS\n";