rx-player
Version:
Canal+ HTML5 Video Player
110 lines (109 loc) • 5.59 kB
JavaScript
;
/**
* 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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = getInitialTime;
var config_1 = require("../../../config");
var log_1 = require("../../../log");
var manifest_1 = require("../../../manifest");
var is_null_or_undefined_1 = require("../../../utils/is_null_or_undefined");
var monotonic_timestamp_1 = require("../../../utils/monotonic_timestamp");
/**
* Returns the calculated initial time for the content described by the given
* Manifest:
* 1. if a start time is defined by user, calculate starting time from the
* manifest information
* 2. else if the media is live, use the live edge and suggested delays from
* it
* 3. else returns the minimum time announced in the manifest
* @param {Manifest} manifest
* @param {boolean} lowLatencyMode
* @param {Object} startAt
* @returns {Number}
*/
function getInitialTime(manifest, lowLatencyMode, startAt) {
var _a;
if (!(0, is_null_or_undefined_1.default)(startAt)) {
var min = (0, manifest_1.getMinimumSafePosition)(manifest);
var max = (0, manifest_1.getMaximumSafePosition)(manifest);
if (!(0, is_null_or_undefined_1.default)(startAt.position)) {
log_1.default.debug("Init: using startAt.minimumPosition");
return Math.max(Math.min(startAt.position, max), min);
}
else if (!(0, is_null_or_undefined_1.default)(startAt.wallClockTime)) {
log_1.default.debug("Init: using startAt.wallClockTime");
var ast = manifest.availabilityStartTime === undefined ? 0 : manifest.availabilityStartTime;
var position = startAt.wallClockTime - ast;
return Math.max(Math.min(position, max), min);
}
else if (!(0, is_null_or_undefined_1.default)(startAt.fromFirstPosition)) {
log_1.default.debug("Init: using startAt.fromFirstPosition");
var fromFirstPosition = startAt.fromFirstPosition;
return fromFirstPosition <= 0 ? min : Math.min(max, min + fromFirstPosition);
}
else if (!(0, is_null_or_undefined_1.default)(startAt.fromLastPosition)) {
log_1.default.debug("Init: using startAt.fromLastPosition");
var fromLastPosition = startAt.fromLastPosition;
return fromLastPosition >= 0 ? max : Math.max(min, max + fromLastPosition);
}
else if (!(0, is_null_or_undefined_1.default)(startAt.fromLivePosition)) {
log_1.default.debug("Init: using startAt.fromLivePosition");
var livePosition = (_a = (0, manifest_1.getLivePosition)(manifest)) !== null && _a !== void 0 ? _a : max;
var fromLivePosition = startAt.fromLivePosition;
return fromLivePosition >= 0
? livePosition
: Math.max(min, livePosition + fromLivePosition);
}
else if (!(0, is_null_or_undefined_1.default)(startAt.percentage)) {
log_1.default.debug("Init: using startAt.percentage");
var percentage = startAt.percentage;
if (percentage > 100) {
return max;
}
else if (percentage < 0) {
return min;
}
var ratio = +percentage / 100;
var extent = max - min;
return min + extent * ratio;
}
}
var minimumPosition = (0, manifest_1.getMinimumSafePosition)(manifest);
if (manifest.isLive) {
var suggestedPresentationDelay = manifest.suggestedPresentationDelay, clockOffset = manifest.clockOffset;
var maximumPosition = (0, manifest_1.getMaximumSafePosition)(manifest);
var liveTime = void 0;
var DEFAULT_LIVE_GAP = config_1.default.getCurrent().DEFAULT_LIVE_GAP;
if (clockOffset === undefined) {
log_1.default.info("Init: no clock offset found for a live content, " +
"starting close to maximum available position");
liveTime = maximumPosition;
}
else {
log_1.default.info("Init: clock offset found for a live content, " +
"checking if we can start close to it");
var ast = manifest.availabilityStartTime === undefined ? 0 : manifest.availabilityStartTime;
var clockRelativeLiveTime = ((0, monotonic_timestamp_1.default)() + clockOffset) / 1000 - ast;
liveTime = Math.min(maximumPosition, clockRelativeLiveTime);
}
var diffFromLiveTime = suggestedPresentationDelay !== null && suggestedPresentationDelay !== void 0 ? suggestedPresentationDelay : (lowLatencyMode ? DEFAULT_LIVE_GAP.LOW_LATENCY : DEFAULT_LIVE_GAP.DEFAULT);
log_1.default.debug("Init: ".concat(liveTime, " defined as the live time, applying a live gap") +
" of ".concat(diffFromLiveTime));
return Math.max(liveTime - diffFromLiveTime, minimumPosition);
}
log_1.default.info("Init: starting at the minimum available position:", minimumPosition);
return minimumPosition;
}