shaka-player
Version:
DASH/EME video player library
323 lines (291 loc) • 11.7 kB
JavaScript
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.polyfill.MediaCapabilities');
goog.require('shaka.log');
goog.require('shaka.media.Capabilities');
goog.require('shaka.polyfill');
goog.require('shaka.util.Platform');
/**
* @summary A polyfill to provide navigator.mediaCapabilities on all browsers.
* This is necessary for Tizen 3, Xbox One and possibly others we have yet to
* discover.
* @export
*/
shaka.polyfill.MediaCapabilities = class {
/**
* Install the polyfill if needed.
* @suppress {const}
* @export
*/
static install() {
// Since MediaCapabilities implementation is buggy on the Chromecast
// platform (see https://github.com/shaka-project/shaka-player/issues/4569),
// we should always install polyfills on all Chromecast models.
// TODO: re-evaluate MediaCapabilities in the future versions of Chromecast.
// Since MediaCapabilities implementation is buggy in Apple browsers, we
// should always install polyfill for Apple browsers.
// See: https://github.com/shaka-project/shaka-player/issues/3530
// TODO: re-evaluate MediaCapabilities in the future versions of Apple
// Browsers.
// Since MediaCapabilities implementation is buggy in PS5 browsers, we
// should always install polyfill for PS5 browsers.
// See: https://github.com/shaka-project/shaka-player/issues/3582
// TODO: re-evaluate MediaCapabilities in the future versions of PS5
// Browsers.
// Since MediaCapabilities implementation does not exist in PS4 browsers, we
// should always install polyfill.
// Since MediaCapabilities implementation is buggy in Tizen browsers, we
// should always install polyfill for Tizen browsers.
// Since MediaCapabilities implementation is buggy in WebOS browsers, we
// should always install polyfill for WebOS browsers.
// Since MediaCapabilities implementation is buggy in EOS browsers, we
// should always install polyfill for EOS browsers.
// Since MediaCapabilities implementation is buggy in Hisense browsers, we
// should always install polyfill for Hisense browsers.
let canUseNativeMCap = true;
if (shaka.util.Platform.isApple() ||
shaka.util.Platform.isPS5() ||
shaka.util.Platform.isPS4() ||
shaka.util.Platform.isWebOS() ||
shaka.util.Platform.isTizen() ||
shaka.util.Platform.isChromecast() ||
shaka.util.Platform.isEOS() ||
shaka.util.Platform.isHisense()) {
canUseNativeMCap = false;
}
if (canUseNativeMCap && navigator.mediaCapabilities) {
shaka.log.info(
'MediaCapabilities: Native mediaCapabilities support found.');
return;
}
shaka.log.info('MediaCapabilities: install');
if (!navigator.mediaCapabilities) {
navigator.mediaCapabilities = /** @type {!MediaCapabilities} */ ({});
}
// Keep the patched MediaCapabilities object from being garbage-collected in
// Safari.
// See https://github.com/shaka-project/shaka-player/issues/3696#issuecomment-1009472718
shaka.polyfill.MediaCapabilities.originalMcap =
navigator.mediaCapabilities;
navigator.mediaCapabilities.decodingInfo =
shaka.polyfill.MediaCapabilities.decodingInfo_;
}
/**
* @param {!MediaDecodingConfiguration} mediaDecodingConfig
* @return {!Promise.<!MediaCapabilitiesDecodingInfo>}
* @private
*/
static async decodingInfo_(mediaDecodingConfig) {
const res = {
supported: false,
powerEfficient: true,
smooth: true,
keySystemAccess: null,
configuration: mediaDecodingConfig,
};
if (!mediaDecodingConfig) {
return res;
}
const videoConfig = mediaDecodingConfig['video'];
const audioConfig = mediaDecodingConfig['audio'];
const Capabilities = shaka.media.Capabilities;
if (mediaDecodingConfig.type == 'media-source') {
if (!shaka.util.Platform.supportsMediaSource()) {
return res;
}
// Use 'shaka.media.Capabilities.isTypeSupported'to check if
// the stream is supported.
// Cast platforms will additionally check canDisplayType(), which
// accepts extended MIME type parameters.
// See: https://github.com/shaka-project/shaka-player/issues/4726
if (videoConfig) {
let isSupported;
if (shaka.util.Platform.isChromecast()) {
isSupported =
shaka.polyfill.MediaCapabilities.canCastDisplayType_(videoConfig);
} else if (shaka.util.Platform.isTizen()) {
let extendedType = videoConfig.contentType;
if (videoConfig.width && videoConfig.height) {
extendedType += `; width=${videoConfig.width}`;
extendedType += `; height=${videoConfig.height}`;
}
if (videoConfig.framerate) {
extendedType += `; framerate=${videoConfig.framerate}`;
}
if (videoConfig.bitrate) {
extendedType += `; bitrate=${videoConfig.bitrate}`;
}
isSupported = Capabilities.isTypeSupported(extendedType);
} else {
isSupported = Capabilities.isTypeSupported(videoConfig.contentType);
}
if (!isSupported) {
return res;
}
}
if (audioConfig) {
const contentType = audioConfig.contentType;
const isSupported = Capabilities.isTypeSupported(contentType);
if (!isSupported) {
return res;
}
}
} else if (mediaDecodingConfig.type == 'file') {
if (videoConfig) {
const contentType = videoConfig.contentType;
const isSupported = shaka.util.Platform.supportsMediaType(contentType);
if (!isSupported) {
return res;
}
}
if (audioConfig) {
const contentType = audioConfig.contentType;
const isSupported = shaka.util.Platform.supportsMediaType(contentType);
if (!isSupported) {
return res;
}
}
} else {
// Otherwise not supported.
return res;
}
if (!mediaDecodingConfig.keySystemConfiguration) {
// The variant is supported if it's unencrypted.
res.supported = true;
return Promise.resolve(res);
} else {
// Get the MediaKeySystemAccess for the key system.
// Convert the MediaDecodingConfiguration object to a
// MediaKeySystemConfiguration object.
/** @type {MediaCapabilitiesKeySystemConfiguration} */
const mediaCapkeySystemConfig =
mediaDecodingConfig.keySystemConfiguration;
const audioCapabilities = [];
const videoCapabilities = [];
if (mediaCapkeySystemConfig.audio) {
const capability = {
robustness: mediaCapkeySystemConfig.audio.robustness || '',
contentType: mediaDecodingConfig.audio.contentType,
};
audioCapabilities.push(capability);
}
if (mediaCapkeySystemConfig.video) {
const capability = {
robustness: mediaCapkeySystemConfig.video.robustness || '',
contentType: mediaDecodingConfig.video.contentType,
};
videoCapabilities.push(capability);
}
/** @type {MediaKeySystemConfiguration} */
const mediaKeySystemConfig = {
initDataTypes: [mediaCapkeySystemConfig.initDataType],
distinctiveIdentifier: mediaCapkeySystemConfig.distinctiveIdentifier,
persistentState: mediaCapkeySystemConfig.persistentState,
sessionTypes: mediaCapkeySystemConfig.sessionTypes,
};
// Only add the audio video capabilities if they have valid data.
// Otherwise the query will fail.
if (audioCapabilities.length) {
mediaKeySystemConfig.audioCapabilities = audioCapabilities;
}
if (videoCapabilities.length) {
mediaKeySystemConfig.videoCapabilities = videoCapabilities;
}
const cacheKey = shaka.polyfill.MediaCapabilities
.generateKeySystemCacheKey_(
mediaDecodingConfig.video ?
mediaDecodingConfig.video.contentType : '',
mediaDecodingConfig.audio ?
mediaDecodingConfig.audio.contentType : '',
mediaDecodingConfig.keySystemConfiguration.keySystem);
let keySystemAccess;
try {
if (cacheKey in shaka.polyfill.MediaCapabilities
.memoizedMediaKeySystemAccessRequests_) {
keySystemAccess = shaka.polyfill.MediaCapabilities
.memoizedMediaKeySystemAccessRequests_[cacheKey];
} else {
keySystemAccess = await navigator.requestMediaKeySystemAccess(
mediaCapkeySystemConfig.keySystem, [mediaKeySystemConfig]);
shaka.polyfill.MediaCapabilities
.memoizedMediaKeySystemAccessRequests_[cacheKey] =
keySystemAccess;
}
} catch (e) {
shaka.log.info('navigator.requestMediaKeySystemAccess failed.');
}
if (keySystemAccess) {
res.supported = true;
res.keySystemAccess = keySystemAccess;
}
}
return res;
}
/**
* Checks if the given media parameters of the video or audio streams are
* supported by the Cast platform.
* @param {!VideoConfiguration} videoConfig The 'video' field of the
* MediaDecodingConfiguration.
* @return {boolean} `true` when the stream can be displayed on a Cast device.
* @private
*/
static canCastDisplayType_(videoConfig) {
if (!(window.cast &&
cast.__platform__ && cast.__platform__.canDisplayType)) {
shaka.log.warning('Expected cast APIs to be available! Falling back to ' +
'shaka.media.Capabilities.isTypeSupported() for type support.');
return shaka.media.Capabilities.isTypeSupported(videoConfig.contentType);
}
let displayType = videoConfig.contentType;
if (videoConfig.width && videoConfig.height) {
displayType +=
`; width=${videoConfig.width}; height=${videoConfig.height}`;
}
if (videoConfig.framerate) {
displayType += `; framerate=${videoConfig.framerate}`;
}
if (videoConfig.transferFunction === 'pq') {
// A "PQ" transfer function indicates this is an HDR-capable stream;
// "smpte2084" is the published standard. We need to inform the platform
// this query is specifically for HDR.
displayType += '; eotf=smpte2084';
}
return cast.__platform__.canDisplayType(displayType);
}
/**
* A method for generating a key for the MediaKeySystemAccessRequests cache.
*
* @param {!string} videoCodec
* @param {!string} audioCodec
* @param {!string} keySystem
* @return {!string}
* @private
*/
static generateKeySystemCacheKey_(videoCodec, audioCodec, keySystem) {
return `${videoCodec}#${audioCodec}#${keySystem}`;
}
};
/**
* A copy of the MediaCapabilities instance, to prevent Safari from
* garbage-collecting the polyfilled method on it. We make it public and export
* it to ensure that it is not stripped out by the compiler.
*
* @type {MediaCapabilities}
* @export
*/
shaka.polyfill.MediaCapabilities.originalMcap = null;
/**
* A cache that stores the MediaKeySystemAccess result of calling
* `navigator.requestMediaKeySystemAccess` by a key combination of
* video/audio codec and key system string.
*
* @type {(Object<(!string), (!MediaKeySystemAccess)>)}
* @export
*/
shaka.polyfill.MediaCapabilities.memoizedMediaKeySystemAccessRequests_ = {};
// Install at a lower priority than MediaSource polyfill, so that we have
// MediaSource available first.
shaka.polyfill.register(shaka.polyfill.MediaCapabilities.install, -1);