rx-player
Version:
Canal+ HTML5 Video Player
703 lines (702 loc) • 33.3 kB
JavaScript
"use strict";
/**
* Copyright 2015 CANAL+ Group
*
* 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.
*/
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.isSegmentStillAvailable = isSegmentStillAvailable;
exports.getLastRequestableSegmentInfo = getLastRequestableSegmentInfo;
var config_1 = require("../../../../../../config");
var errors_1 = require("../../../../../../errors");
var log_1 = require("../../../../../../log");
var assert_1 = require("../../../../../../utils/assert");
var is_null_or_undefined_1 = require("../../../../../../utils/is_null_or_undefined");
var monotonic_timestamp_1 = require("../../../../../../utils/monotonic_timestamp");
var clear_timeline_from_position_1 = require("../../../../utils/clear_timeline_from_position");
var index_helpers_1 = require("../../../../utils/index_helpers");
var update_segment_timeline_1 = require("../../../../utils/update_segment_timeline");
var get_init_segment_1 = require("../get_init_segment");
var get_segments_from_timeline_1 = require("../get_segments_from_timeline");
var tokens_1 = require("../tokens");
var utils_1 = require("../utils");
var construct_timeline_from_elements_1 = require("./construct_timeline_from_elements");
var construct_timeline_from_previous_timeline_1 = require("./construct_timeline_from_previous_timeline");
/**
* `IRepresentationIndex` implementation for a DASH `SegmentTimeline` segment
* indexing scheme.
* @class TimelineRepresentationIndex
*/
var TimelineRepresentationIndex = /** @class */ (function () {
/**
* @param {Object} index
* @param {Object} context
*/
function TimelineRepresentationIndex(index, context) {
var _a, _b, _c, _d, _e;
if (!TimelineRepresentationIndex.isTimelineIndexArgument(index)) {
throw new Error("The given index is not compatible with a " + "TimelineRepresentationIndex.");
}
var availabilityTimeComplete = context.availabilityTimeComplete, availabilityTimeOffset = context.availabilityTimeOffset, manifestBoundsCalculator = context.manifestBoundsCalculator, isDynamic = context.isDynamic, isLastPeriod = context.isLastPeriod, representationId = context.representationId, representationBitrate = context.representationBitrate, periodStart = context.periodStart, periodEnd = context.periodEnd, isEMSGWhitelisted = context.isEMSGWhitelisted;
var timescale = (_a = index.timescale) !== null && _a !== void 0 ? _a : 1;
var presentationTimeOffset = (_b = index.presentationTimeOffset) !== null && _b !== void 0 ? _b : 0;
var scaledStart = periodStart * timescale;
var indexTimeOffset = presentationTimeOffset - scaledStart;
this._manifestBoundsCalculator = manifestBoundsCalculator;
this._isEMSGWhitelisted = isEMSGWhitelisted;
this._isLastPeriod = isLastPeriod;
this._lastUpdate = (_c = context.receivedTime) !== null && _c !== void 0 ? _c : (0, monotonic_timestamp_1.default)();
this._unsafelyBaseOnPreviousIndex = null;
if (context.unsafelyBaseOnPreviousRepresentation !== null &&
context.unsafelyBaseOnPreviousRepresentation.index instanceof
TimelineRepresentationIndex) {
// avoid too much nested references, to keep memory down
context.unsafelyBaseOnPreviousRepresentation.index._unsafelyBaseOnPreviousIndex =
null;
this._unsafelyBaseOnPreviousIndex =
context.unsafelyBaseOnPreviousRepresentation.index;
}
this._isDynamic = isDynamic;
this._parseTimeline = (_d = index.timelineParser) !== null && _d !== void 0 ? _d : null;
var initializationUrl = ((_e = index.initialization) === null || _e === void 0 ? void 0 : _e.media) === undefined
? null
: (0, tokens_1.constructRepresentationUrl)(index.initialization.media, representationId, representationBitrate);
var segmentUrlTemplate = index.media === undefined
? null
: (0, tokens_1.constructRepresentationUrl)(index.media, representationId, representationBitrate);
var actualAvailabilityTimeOffset;
// Technically, it seems (although it is not clear) that an MPD may contain
// future segments and it's the job of a player to not request segments later
// than the time at which they should be available.
// In practice, we don't do that for various reasons: precision issues,
// various DASH spec interpretations by packagers and players...
//
// So as a compromise, if nothing in the MPD indicates that future segments
// may be announced (see code below), we will act as if ALL segments in this
// TimelineRepresentationIndex are requestable
if (availabilityTimeOffset === undefined && availabilityTimeComplete === undefined) {
actualAvailabilityTimeOffset = Infinity; // Meaning: we can request
// everything in the index
}
else {
actualAvailabilityTimeOffset = availabilityTimeOffset !== null && availabilityTimeOffset !== void 0 ? availabilityTimeOffset : 0;
}
this._index = {
availabilityTimeComplete: availabilityTimeComplete !== null && availabilityTimeComplete !== void 0 ? availabilityTimeComplete : true,
availabilityTimeOffset: actualAvailabilityTimeOffset,
indexRange: index.indexRange,
indexTimeOffset: indexTimeOffset,
initialization: (0, is_null_or_undefined_1.default)(index.initialization)
? undefined
: {
url: initializationUrl,
range: index.initialization.range,
},
segmentUrlTemplate: segmentUrlTemplate,
startNumber: index.startNumber,
endNumber: index.endNumber,
timeline: index.timeline === undefined
? null
: updateTimelineFromEndNumber(index.timeline, index.startNumber, index.endNumber),
timescale: timescale,
};
this._scaledPeriodStart = (0, index_helpers_1.toIndexTime)(periodStart, this._index);
this._scaledPeriodEnd =
periodEnd === undefined ? undefined : (0, index_helpers_1.toIndexTime)(periodEnd, this._index);
}
/**
* Construct init Segment.
* @returns {Object}
*/
TimelineRepresentationIndex.prototype.getInitSegment = function () {
return (0, get_init_segment_1.default)(this._index, this._isEMSGWhitelisted);
};
/**
* Asks for segments to download for a given time range.
* @param {Number} from - Beginning of the time wanted, in seconds
* @param {Number} duration - duration wanted, in seconds
* @returns {Array.<Object>}
*/
TimelineRepresentationIndex.prototype.getSegments = function (from, duration) {
this._refreshTimeline(); // clear timeline if needed
if (this._index.timeline === null) {
this._index.timeline = this._getTimeline();
}
return (0, get_segments_from_timeline_1.default)(this._index, from, duration, this._manifestBoundsCalculator, this._scaledPeriodEnd, this._isEMSGWhitelisted);
};
/**
* Returns true if the index should be refreshed.
* @returns {Boolean}
*/
TimelineRepresentationIndex.prototype.shouldRefresh = function () {
// DASH Manifest based on a SegmentTimeline should have minimumUpdatePeriod
// attribute which should be sufficient to know when to refresh it.
return false;
};
/**
* Returns the starting time, in seconds, of the earliest segment currently
* available.
* Returns null if nothing is in the index
* @returns {Number|null}
*/
TimelineRepresentationIndex.prototype.getFirstAvailablePosition = function () {
this._refreshTimeline();
if (this._index.timeline === null) {
this._index.timeline = this._getTimeline();
}
var timeline = this._index.timeline;
return timeline.length === 0
? null
: (0, index_helpers_1.fromIndexTime)(Math.max(this._scaledPeriodStart, timeline[0].start), this._index);
};
/**
* Returns the ending time, in seconds, of the last segment currently
* available.
* Returns null if nothing is in the index
* @returns {Number|null}
*/
TimelineRepresentationIndex.prototype.getLastAvailablePosition = function () {
var _a;
this._refreshTimeline();
if (this._index.timeline === null) {
this._index.timeline = this._getTimeline();
}
var lastReqSegInfo = getLastRequestableSegmentInfo(
// Needed typecast for TypeScript
this._index, this._manifestBoundsCalculator, this._scaledPeriodEnd);
if (lastReqSegInfo === null) {
return null;
}
var lastScaledPosition = Math.min(lastReqSegInfo.end, (_a = this._scaledPeriodEnd) !== null && _a !== void 0 ? _a : Infinity);
return (0, index_helpers_1.fromIndexTime)(lastScaledPosition, this._index);
};
/**
* Returns the absolute end in seconds this RepresentationIndex can reach once
* all segments are available.
* @returns {number|null|undefined}
*/
TimelineRepresentationIndex.prototype.getEnd = function () {
var _a;
if (this._isDynamic && !this._isLastPeriod) {
return undefined;
}
this._refreshTimeline();
if (this._index.timeline === null) {
this._index.timeline = this._getTimeline();
}
if (this._index.timeline.length <= 0) {
return null;
}
var lastSegment = this._index.timeline[this._index.timeline.length - 1];
var lastTime = Math.min((0, index_helpers_1.getIndexSegmentEnd)(lastSegment, null, this._scaledPeriodEnd), (_a = this._scaledPeriodEnd) !== null && _a !== void 0 ? _a : Infinity);
return (0, index_helpers_1.fromIndexTime)(lastTime, this._index);
};
/**
* Returns:
* - `true` if in the given time interval, at least one new segment is
* expected to be available in the future.
* - `false` either if all segments in that time interval are already
* available for download or if none will ever be available for it.
* - `undefined` when it is not possible to tell.
* @param {number} start
* @param {number} end
* @returns {boolean|undefined}
*/
TimelineRepresentationIndex.prototype.awaitSegmentBetween = function (start, end) {
var _a, _b;
(0, assert_1.default)(start <= end);
if (!this._isDynamic) {
return false; // No segment will be newly available in the future
}
this._refreshTimeline();
if (this._index.timeline === null) {
this._index.timeline = this._getTimeline();
}
var _c = this._index, timescale = _c.timescale, timeline = _c.timeline;
var segmentTimeRounding = (0, utils_1.getSegmentTimeRoundingError)(timescale);
var scaledWantedEnd = (0, index_helpers_1.toIndexTime)(end, this._index);
var lastReqSegInfo = getLastRequestableSegmentInfo(
// Needed typecast for TypeScript
this._index, this._manifestBoundsCalculator, this._scaledPeriodEnd);
if (lastReqSegInfo !== null) {
var lastReqSegmentEnd = Math.min(lastReqSegInfo.end, (_a = this._scaledPeriodEnd) !== null && _a !== void 0 ? _a : Infinity);
var roundedReqSegmentEnd = lastReqSegmentEnd + segmentTimeRounding;
if (roundedReqSegmentEnd >=
Math.min(scaledWantedEnd, (_b = this._scaledPeriodEnd) !== null && _b !== void 0 ? _b : Infinity)) {
return false; // everything up to that point is already requestable
}
}
var scaledWantedStart = (0, index_helpers_1.toIndexTime)(start, this._index);
if (timeline.length > 0 &&
lastReqSegInfo !== null &&
!lastReqSegInfo.isLastOfTimeline) {
// There are some future segments already anounced in the MPD
var lastSegment = timeline[timeline.length - 1];
var lastSegmentEnd = (0, index_helpers_1.getIndexSegmentEnd)(lastSegment, null, this._scaledPeriodEnd);
var roundedLastSegEnd = lastSegmentEnd + segmentTimeRounding;
if (scaledWantedStart < roundedLastSegEnd + segmentTimeRounding) {
return true; // The MPD's timeline already contains one such element,
// It is just not requestable yet
}
}
if (!this._isLastPeriod) {
// Let's consider - perhaps wrongly, that Periods which aren't the last
// one have all of their segments announced.
return false;
}
if (this._scaledPeriodEnd === undefined) {
return scaledWantedEnd + segmentTimeRounding > this._scaledPeriodStart
? undefined // There may be future segments at this point
: false; // Before the current Period
}
// `true` if within the boundaries of this Period. `false` otherwise.
return (scaledWantedStart - segmentTimeRounding < this._scaledPeriodEnd &&
scaledWantedEnd + segmentTimeRounding > this._scaledPeriodStart);
};
/**
* Returns true if a Segment returned by this index is still considered
* available.
* Returns false if it is not available anymore.
* Returns undefined if we cannot know whether it is still available or not.
* @param {Object} segment
* @returns {Boolean|undefined}
*/
TimelineRepresentationIndex.prototype.isSegmentStillAvailable = function (segment) {
if (segment.isInit) {
return true;
}
this._refreshTimeline();
if (this._index.timeline === null) {
this._index.timeline = this._getTimeline();
}
return isSegmentStillAvailable(segment,
// Needed typecast for TypeScript
this._index, this._manifestBoundsCalculator, this._scaledPeriodEnd);
};
/**
* Checks if the time given is in a discontinuity. That is:
* - We're on the upper bound of the current range (end of the range - time
* is inferior to the timescale)
* - The next range starts after the end of the current range.
* @param {Number} time
* @returns {Number|null}
*/
TimelineRepresentationIndex.prototype.checkDiscontinuity = function (time) {
this._refreshTimeline();
var timeline = this._index.timeline;
if (timeline === null) {
timeline = this._getTimeline();
this._index.timeline = timeline;
}
return (0, index_helpers_1.checkDiscontinuity)({
timeline: timeline,
timescale: this._index.timescale,
indexTimeOffset: this._index.indexTimeOffset,
}, time, this._scaledPeriodEnd);
};
/**
* @param {Error} error
* @returns {Boolean}
*/
TimelineRepresentationIndex.prototype.canBeOutOfSyncError = function (error) {
if (!this._isDynamic) {
return false;
}
return error instanceof errors_1.NetworkError && error.isHttpError(404);
};
/**
* Replace this RepresentationIndex with one from a new version of the
* Manifest.
* @param {Object} newIndex
*/
TimelineRepresentationIndex.prototype._replace = function (newIndex) {
this._parseTimeline = newIndex._parseTimeline;
this._index = newIndex._index;
this._isDynamic = newIndex._isDynamic;
this._scaledPeriodStart = newIndex._scaledPeriodStart;
this._scaledPeriodEnd = newIndex._scaledPeriodEnd;
this._lastUpdate = newIndex._lastUpdate;
this._manifestBoundsCalculator = newIndex._manifestBoundsCalculator;
this._isLastPeriod = newIndex._isLastPeriod;
};
/**
* Update this RepresentationIndex with a shorter version of it coming from a
* new version of the MPD.
* @param {Object} newIndex
*/
TimelineRepresentationIndex.prototype._update = function (newIndex) {
if (this._index.timeline === null) {
this._index.timeline = this._getTimeline();
}
if (newIndex._index.timeline === null) {
newIndex._index.timeline = newIndex._getTimeline();
}
var hasReplaced = (0, update_segment_timeline_1.default)(this._index.timeline, newIndex._index.timeline);
if (hasReplaced) {
this._index.startNumber = newIndex._index.startNumber;
}
this._index.availabilityTimeOffset = newIndex._index.availabilityTimeOffset;
this._index.availabilityTimeComplete = newIndex._index.availabilityTimeComplete;
this._index.endNumber = newIndex._index.endNumber;
this._isDynamic = newIndex._isDynamic;
this._scaledPeriodStart = newIndex._scaledPeriodStart;
this._scaledPeriodEnd = newIndex._scaledPeriodEnd;
this._lastUpdate = newIndex._lastUpdate;
this._isLastPeriod = newIndex._isLastPeriod;
};
/**
* Returns `false` if this RepresentationIndex currently contains its last
* segment.
* Returns `true` if it's still pending.
* @returns {Boolean}
*/
TimelineRepresentationIndex.prototype.isStillAwaitingFutureSegments = function () {
var _a;
if (!this._isDynamic) {
return false;
}
this._refreshTimeline();
if (this._index.timeline === null) {
this._index.timeline = this._getTimeline();
}
var timeline = this._index.timeline;
if (timeline.length === 0) {
// No segment announced in this Period
if (this._scaledPeriodEnd !== undefined) {
var liveEdge = this._manifestBoundsCalculator.getEstimatedLiveEdge();
if (liveEdge !== undefined &&
(0, index_helpers_1.toIndexTime)(liveEdge, this._index) > this._scaledPeriodEnd) {
// This Period is over, we're not awaiting anything
return false;
}
}
// Let's just consider that we're awaiting only for when this is the last Period.
return this._isLastPeriod;
}
var segmentTimeRounding = (0, utils_1.getSegmentTimeRoundingError)(this._index.timescale);
var lastReqSegInfo = getLastRequestableSegmentInfo(
// Needed typecast for TypeScript
this._index, this._manifestBoundsCalculator, this._scaledPeriodEnd);
if (lastReqSegInfo !== null && !lastReqSegInfo.isLastOfTimeline) {
// There might be non-yet requestable segments in the manifest
var lastReqSegmentEnd = Math.min(lastReqSegInfo.end, (_a = this._scaledPeriodEnd) !== null && _a !== void 0 ? _a : Infinity);
if (this._scaledPeriodEnd !== undefined &&
lastReqSegmentEnd + segmentTimeRounding >= this._scaledPeriodEnd) {
// The last requestable segment ends after the end of the Period anyway
return false;
}
return true; // There are not-yet requestable segments
}
if (!this._isLastPeriod) {
// This index is not linked to the current last Period in the MPD, in
// which case it is inferred that all segments have been announced.
//
// Note that this condition might break very very rare use cases where old
// Periods are still being generated, yet it should fix more cases than it
// breaks.
return false;
}
if (this._scaledPeriodEnd === undefined) {
// This is the last Period of a dynamic content whose end is unknown.
// Just return true.
return true;
}
var lastSegment = timeline[timeline.length - 1];
var lastSegmentEnd = (0, index_helpers_1.getIndexSegmentEnd)(lastSegment, null, this._scaledPeriodEnd);
// We're awaiting future segments only if the current end is before the end
// of the Period
return lastSegmentEnd + segmentTimeRounding < this._scaledPeriodEnd;
};
/**
* @returns {Boolean}
*/
TimelineRepresentationIndex.prototype.isInitialized = function () {
return true;
};
TimelineRepresentationIndex.prototype.initialize = function () {
log_1.default.error("A `TimelineRepresentationIndex` does not need to be initialized");
};
TimelineRepresentationIndex.prototype.addPredictedSegments = function () {
log_1.default.warn("Cannot add predicted segments to a `TimelineRepresentationIndex`");
};
/**
* Returns the `duration` of each segment in the context of its Manifest (i.e.
* as the Manifest anounces them, actual segment duration may be different due
* to approximations), in seconds.
*
* NOTE: we could here do a median or a mean but I chose to be lazy (and
* more performant) by returning the duration of the first element instead.
* As `isPrecize` is `false`, the rest of the code should be notified that
* this is only an approximation.
* @returns {number}
*/
TimelineRepresentationIndex.prototype.getTargetSegmentDuration = function () {
this._refreshTimeline();
var _a = this._index, timeline = _a.timeline, timescale = _a.timescale;
if (timeline === null) {
return undefined;
}
var firstElementInTimeline = timeline[0];
if (firstElementInTimeline === undefined) {
return undefined;
}
return {
duration: firstElementInTimeline.duration / timescale,
isPrecize: false,
};
};
/**
* Returns `true` if the given object can be used as an "index" argument to
* create a new `TimelineRepresentationIndex`.
* @param {Object} index
* @returns {boolean}
*/
TimelineRepresentationIndex.isTimelineIndexArgument = function (index) {
return typeof index.timelineParser === "function" || Array.isArray(index.timeline);
};
/**
* Clean-up timeline to remove segment information which should not be
* available due to timeshifting.
*/
TimelineRepresentationIndex.prototype._refreshTimeline = function () {
var _a, _b;
if (this._index.timeline === null) {
this._index.timeline = this._getTimeline();
}
if (!this._isDynamic) {
return;
}
var firstPosition = this._manifestBoundsCalculator.getEstimatedMinimumSegmentTime(((_b = (_a = this._index.timeline[0]) === null || _a === void 0 ? void 0 : _a.duration) !== null && _b !== void 0 ? _b : 0) / this._index.timescale);
if ((0, is_null_or_undefined_1.default)(firstPosition)) {
return; // we don't know yet
}
var scaledFirstPosition = (0, index_helpers_1.toIndexTime)(firstPosition, this._index);
var nbEltsRemoved = (0, clear_timeline_from_position_1.default)(this._index.timeline, scaledFirstPosition);
if (this._index.startNumber !== undefined) {
this._index.startNumber += nbEltsRemoved;
}
else if (this._index.endNumber !== undefined) {
this._index.startNumber = nbEltsRemoved + 1;
}
};
/**
* Allows to generate the "timeline" for this RepresentationIndex.
* Call this function when the timeline is unknown.
* This function was added to only perform that task lazily, i.e. only when
* first needed.
* After calling it, every now unneeded variable will be freed from memory.
* This means that calling _getTimeline more than once will just return an
* empty array.
*
* /!\ Please note that this structure should follow the exact same structure
* than a SegmentTimeline element in the corresponding MPD.
* This means:
* - It should have the same amount of elements in its array than there was
* `<S>` elements in the SegmentTimeline.
* - Each of those same elements should have the same start time, the same
* duration and the same repeat counter than what could be deduced from
* the SegmentTimeline.
* This is needed to be able to run parsing optimization when refreshing the
* MPD. Not doing so could lead to the RxPlayer not being able to play the
* stream anymore.
* @returns {Array.<Object>}
*/
TimelineRepresentationIndex.prototype._getTimeline = function () {
if (this._parseTimeline === null) {
if (this._index.timeline !== null) {
return this._index.timeline;
}
log_1.default.error("DASH: Timeline already lazily parsed.");
return [];
}
var newElements = this._parseTimeline();
this._parseTimeline = null; // Free memory
var MIN_DASH_S_ELEMENTS_TO_PARSE_UNSAFELY = config_1.default.getCurrent().MIN_DASH_S_ELEMENTS_TO_PARSE_UNSAFELY;
if (this._unsafelyBaseOnPreviousIndex === null ||
newElements.length < MIN_DASH_S_ELEMENTS_TO_PARSE_UNSAFELY) {
// Just completely parse the current timeline
return updateTimelineFromEndNumber((0, construct_timeline_from_elements_1.default)(newElements), this._index.startNumber, this._index.endNumber);
}
// Construct previously parsed timeline if not already done
var prevTimeline;
if (this._unsafelyBaseOnPreviousIndex._index.timeline === null) {
prevTimeline = this._unsafelyBaseOnPreviousIndex._getTimeline();
this._unsafelyBaseOnPreviousIndex._index.timeline = prevTimeline;
}
else {
prevTimeline = this._unsafelyBaseOnPreviousIndex._index.timeline;
}
this._unsafelyBaseOnPreviousIndex = null; // Free memory
return updateTimelineFromEndNumber((0, construct_timeline_from_previous_timeline_1.default)(newElements, prevTimeline), this._index.startNumber, this._index.endNumber);
};
return TimelineRepresentationIndex;
}());
exports.default = TimelineRepresentationIndex;
/**
* Take the original SegmentTimeline's parsed timeline and, if an `endNumber` is
* specified, filter segments which possess a number superior to that number.
*
* This should only be useful in only rare and broken MPDs, but we aim to
* respect the specification even in those cases.
*
* @param {Array.<Object>} timeline
* @param {number|undefined} startNumber
* @param {Array.<Object>} endNumber
* @returns {number|undefined}
*/
function updateTimelineFromEndNumber(timeline, startNumber, endNumber) {
if (endNumber === undefined) {
return timeline;
}
var currNumber = startNumber !== null && startNumber !== void 0 ? startNumber : 1;
for (var idx = 0; idx < timeline.length; idx++) {
var seg = timeline[idx];
currNumber += seg.repeatCount + 1;
if (currNumber > endNumber) {
if (currNumber === endNumber + 1) {
return timeline.slice(0, idx + 1);
}
else {
var newTimeline = timeline.slice(0, idx);
var lastElt = __assign({}, seg);
var beginningNumber = currNumber - seg.repeatCount - 1;
lastElt.repeatCount = Math.max(0, endNumber - beginningNumber);
newTimeline.push(lastElt);
return newTimeline;
}
}
}
return timeline;
}
/**
* Returns true if a Segment returned by the corresponding index is still
* considered available.
* Returns false if it is not available anymore.
* Returns undefined if we cannot know whether it is still available or not.
* /!\ We do not check the mediaURLs of the segment.
* @param {Object} segment
* @param {Object} index
* @param {Object} manifestBoundsCalculator
* @param {number|undefined} scaledPeriodEnd
* @returns {Boolean|undefined}
*/
function isSegmentStillAvailable(segment, index, manifestBoundsCalculator, scaledPeriodEnd) {
var lastReqSegInfo = getLastRequestableSegmentInfo(index, manifestBoundsCalculator, scaledPeriodEnd);
if (lastReqSegInfo === null) {
return false;
}
for (var i = 0; i < index.timeline.length; i++) {
if (lastReqSegInfo.timelineIdx < i) {
return false;
}
var tSegment = index.timeline[i];
var tSegmentTime = (tSegment.start - index.indexTimeOffset) / index.timescale;
if (tSegmentTime > segment.time) {
return false; // We went over it without finding it
}
else if (tSegmentTime === segment.time) {
if (tSegment.range === undefined) {
return segment.range === undefined;
}
return (!(0, is_null_or_undefined_1.default)(segment.range) &&
tSegment.range[0] === segment.range[0] &&
tSegment.range[1] === segment.range[1]);
}
else {
// tSegment.start < segment.time
if (tSegment.repeatCount >= 0 && tSegment.duration !== undefined) {
var timeDiff = tSegmentTime - tSegment.start;
var repeat = timeDiff / tSegment.duration - 1;
return repeat % 1 === 0 && repeat <= lastReqSegInfo.newRepeatCount;
}
}
}
return false;
}
/**
* Returns from the given RepresentationIndex information on the last segment
* that may be requested currently.
*
* Returns `null` if there's no such segment.
* @param {Object} index
* @param {Object} manifestBoundsCalculator
* @param {number|undefined} scaledPeriodEnd
* @returns {number|null}
*/
function getLastRequestableSegmentInfo(index, manifestBoundsCalculator, scaledPeriodEnd) {
if (index.timeline.length <= 0) {
return null;
}
if (index.availabilityTimeOffset === Infinity) {
// availabilityTimeOffset to Infinity == Everything is requestable in the timeline.
var lastIndex = index.timeline.length - 1;
var lastElem = index.timeline[lastIndex];
return {
isLastOfTimeline: true,
timelineIdx: lastIndex,
newRepeatCount: lastElem.repeatCount,
end: (0, index_helpers_1.getIndexSegmentEnd)(lastElem, null, scaledPeriodEnd),
};
}
var adjustedMaxSeconds = manifestBoundsCalculator.getEstimatedMaximumPosition(index.availabilityTimeOffset);
if (adjustedMaxSeconds === undefined) {
var lastIndex = index.timeline.length - 1;
var lastElem = index.timeline[lastIndex];
return {
isLastOfTimeline: true,
timelineIdx: lastIndex,
newRepeatCount: lastElem.repeatCount,
end: (0, index_helpers_1.getIndexSegmentEnd)(lastElem, null, scaledPeriodEnd),
};
}
for (var i = index.timeline.length - 1; i >= index.timeline.length; i--) {
var element = index.timeline[i];
var endOfFirstOccurence = element.start + element.duration;
if ((0, index_helpers_1.fromIndexTime)(endOfFirstOccurence, index) <= adjustedMaxSeconds) {
var endTime = (0, index_helpers_1.getIndexSegmentEnd)(element, index.timeline[i + 1], scaledPeriodEnd);
if ((0, index_helpers_1.fromIndexTime)(endTime, index) <= adjustedMaxSeconds) {
return {
isLastOfTimeline: i === index.timeline.length - 1,
timelineIdx: i,
newRepeatCount: element.repeatCount,
end: endOfFirstOccurence,
};
}
else {
// We have to find the right repeatCount
var maxIndexTime = (0, index_helpers_1.toIndexTime)(adjustedMaxSeconds, index);
var diffToSegStart = maxIndexTime - element.start;
var nbOfSegs = Math.floor(diffToSegStart / element.duration);
(0, assert_1.default)(nbOfSegs >= 1);
return {
isLastOfTimeline: false,
timelineIdx: i,
newRepeatCount: nbOfSegs - 1,
end: element.start + nbOfSegs * element.duration,
};
}
}
}
return null;
}