shaka-player
Version:
DASH/EME video player library
71 lines (65 loc) • 2.2 kB
JavaScript
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.media.Capabilities');
/**
* @summary
* This is for capturing all media source capabilities on current platform.
* And this is for static check and can not be constructed.
*/
shaka.media.Capabilities = class {
/**
* Cache browser engine call to improve performance on some poor platforms
*
* @param {string} type
* @return {boolean}
*/
static isTypeSupported(type) {
const supportMap = shaka.media.Capabilities.MediaSourceTypeSupportMap;
if (supportMap.has(type)) {
return supportMap.get(type);
}
const mediaSource = window.ManagedMediaSource || window.MediaSource;
if (mediaSource) {
const currentSupport = mediaSource.isTypeSupported(type);
supportMap.set(type, currentSupport);
return currentSupport;
}
return false;
}
/**
* Determine support for SourceBuffer.changeType
* @return {boolean}
*/
static isChangeTypeSupported() {
const sourceBuffer = window.ManagedSourceBuffer || window.SourceBuffer;
return !!sourceBuffer &&
// eslint-disable-next-line no-restricted-syntax
!!sourceBuffer.prototype && !!sourceBuffer.prototype.changeType;
}
/**
* Determine support for MediaSource.setLiveSeekableRange and
* MediaSource.clearLiveSeekableRange, which can allow for a media element
* duration of Infinite by providing a non-infinite seekable range.
*
* @return {boolean}
*/
static isInfiniteLiveStreamDurationSupported() {
const mediaSource = window.ManagedMediaSource || window.MediaSource;
// eslint-disable-next-line no-restricted-syntax
if (mediaSource && mediaSource.prototype) {
// eslint-disable-next-line no-restricted-syntax
return !!mediaSource.prototype.setLiveSeekableRange &&
// eslint-disable-next-line no-restricted-syntax
!!mediaSource.prototype.clearLiveSeekableRange;
}
return false;
}
};
/**
* Public it for unit test, and developer could also check the support map.
* @type {!Map<string, boolean>}
*/
shaka.media.Capabilities.MediaSourceTypeSupportMap = new Map();