mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-14 15:56:38 +03:00
Joey Parrish
fa931883f7
Use Stream.BUFFER_SIZE_SECONDS_ on startup. Improved the way adaptation latency is measured. Avoid calling abort() twice during adaptation. Reduce the size of the Promise chain slightly. Merge the SPLICING state into SWITCHING. Change-Id: Ie06e6c56df4df17e7acb379d0e19f639f791c99b
122 lines
2.8 KiB
JavaScript
122 lines
2.8 KiB
JavaScript
/**
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* Copyright 2014 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @fileoverview Implements performance timers.
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*/
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goog.provide('shaka.timer');
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goog.require('shaka.log');
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/**
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* @namespace shaka.timer
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* @summary A performance timing framework.
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* Used in both debugging and production builds.
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*/
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/**
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* Begins a timer.
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*
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* @param {string} name
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*/
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shaka.timer.begin = function(name) {
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shaka.timer.timers_[name] = {
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begin: shaka.timer.now_(),
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end: NaN
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};
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};
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/**
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* End a timer and log (debug) the elapsed time.
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* Does nothing if the timer has not begun.
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*
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* @param {string} name
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*/
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shaka.timer.end = function(name) {
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var record = shaka.timer.timers_[name];
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if (!record) {
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return;
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}
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record.end = shaka.timer.now_();
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var diff = record.end - record.begin;
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shaka.log.debug(name + ': ' + diff.toFixed(3) + 'ms');
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};
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/**
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* Log (debug) the diff between two or more completed timers and return it.
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* Does nothing if not all of the timers have begun.
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*
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* @param {string} name1
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* @param {string} name2
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* @param {...string} var_args
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* @return {number} The diff between the timers, or NaN if they have not all
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* completed.
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*/
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shaka.timer.diff = function(name1, name2, var_args) {
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var t1 = shaka.timer.get(name1);
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var t2 = shaka.timer.get(name2);
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if (!t1 || !t2) {
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return NaN;
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}
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var diff = t1 - t2;
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var name = name1 + ' - ' + name2;
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for (var i = 2; i < arguments.length; ++i) {
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var name3 = arguments[i];
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var t3 = shaka.timer.get(name3);
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if (!t3) {
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return NaN;
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}
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diff -= t3;
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name += ' - ' + name3;
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}
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shaka.log.debug(name + ': ' + diff.toFixed(3) + 'ms');
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return diff;
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};
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/**
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* Query a timer.
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*
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* @param {string} name
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* @return {number} The elapsed time in milliseconds, if the timer is complete.
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* Returns NaN if the timer doesn't exist or hasn't ended yet.
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*/
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shaka.timer.get = function(name) {
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var record = shaka.timer.timers_[name];
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if (!record || !record.end) {
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return NaN;
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}
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return record.end - record.begin;
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};
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/** @private {function():number} */
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shaka.timer.now_ = window.performance ?
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window.performance.now.bind(window.performance) :
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Date.now;
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/** @private {!Object.<string, {begin: number, end: number}>} */
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shaka.timer.timers_ = {};
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