shaka-player
Version:
DASH/EME video player library
303 lines (248 loc) • 8.2 kB
JavaScript
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.media.ManifestParser');
goog.require('goog.Uri');
goog.require('shaka.log');
goog.require('shaka.net.NetworkingEngine');
goog.require('shaka.util.Error');
goog.require('shaka.util.Platform');
// TODO: revisit this when Closure Compiler supports partially-exported classes.
/**
* @summary An interface to register manifest parsers.
* @export
*/
shaka.media.ManifestParser = class {
/**
* Registers a manifest parser by file extension.
*
* @param {string} extension The file extension of the manifest.
* @param {shaka.extern.ManifestParser.Factory} parserFactory The factory
* used to create parser instances.
* @export
*/
static registerParserByExtension(extension, parserFactory) {
shaka.media.ManifestParser.parsersByExtension[extension] = parserFactory;
}
/**
* Registers a manifest parser by MIME type.
*
* @param {string} mimeType The MIME type of the manifest.
* @param {shaka.extern.ManifestParser.Factory} parserFactory The factory
* used to create parser instances.
* @export
*/
static registerParserByMime(mimeType, parserFactory) {
shaka.media.ManifestParser.parsersByMime[mimeType] = parserFactory;
}
/**
* Unregisters a manifest parser by MIME type.
*
* @param {string} mimeType The MIME type of the manifest.
* @export
*/
static unregisterParserByMime(mimeType) {
delete shaka.media.ManifestParser.parsersByMime[mimeType];
}
/**
* Returns a map of manifest support for well-known types.
*
* @return {!Object.<string, boolean>}
*/
static probeSupport() {
const ManifestParser = shaka.media.ManifestParser;
const support = {};
// Make sure all registered parsers are shown, but only for MSE-enabled
// platforms where our parsers matter.
if (shaka.util.Platform.supportsMediaSource()) {
for (const type in ManifestParser.parsersByMime) {
support[type] = true;
}
for (const type in ManifestParser.parsersByExtension) {
support[type] = true;
}
}
// Make sure all well-known types are tested as well, just to show an
// explicit false for things people might be expecting.
const testMimeTypes = [
// DASH
'application/dash+xml',
// HLS
'application/x-mpegurl',
'application/vnd.apple.mpegurl',
// SmoothStreaming
'application/vnd.ms-sstr+xml',
];
const testExtensions = {
// DASH
'mpd': 'application/dash+xml',
// HLS
'm3u8': 'application/x-mpegurl',
// SmoothStreaming
'ism': 'application/vnd.ms-sstr+xml',
};
for (const type of testMimeTypes) {
// Only query our parsers for MSE-enabled platforms. Otherwise, query a
// temporary media element for native support for these types.
if (shaka.util.Platform.supportsMediaSource()) {
support[type] = !!ManifestParser.parsersByMime[type];
} else {
support[type] = shaka.util.Platform.supportsMediaType(type);
}
}
for (const extension in testExtensions) {
// Only query our parsers for MSE-enabled platforms. Otherwise, query a
// temporary media element for native support for these MIME type for the
// extension.
if (shaka.util.Platform.supportsMediaSource()) {
support[extension] = !!ManifestParser.parsersByExtension[extension];
} else {
const type = testExtensions[extension];
support[extension] = shaka.util.Platform.supportsMediaType(type);
}
}
return support;
}
/**
* Get a factory that can create a manifest parser that should be able to
* parse the manifest at |uri|.
*
* @param {string} uri
* @param {!shaka.net.NetworkingEngine} netEngine
* @param {shaka.extern.RetryParameters} retryParams
* @param {?string} mimeType
* @return {!Promise.<shaka.extern.ManifestParser.Factory>}
*/
static async getFactory(uri, netEngine, retryParams, mimeType) {
const ManifestParser = shaka.media.ManifestParser;
// Try using the MIME type we were given.
if (mimeType) {
const factory = ManifestParser.parsersByMime[mimeType.toLowerCase()];
if (factory) {
return factory;
}
shaka.log.warning(
'Could not determine manifest type using MIME type ', mimeType);
}
const extension = ManifestParser.getExtension(uri);
if (extension) {
const factory = ManifestParser.parsersByExtension[extension];
if (factory) {
return factory;
}
shaka.log.warning(
'Could not determine manifest type for extension ', extension);
} else {
shaka.log.warning('Could not find extension for ', uri);
}
if (!mimeType) {
mimeType = await ManifestParser.getMimeType(uri, netEngine, retryParams);
if (mimeType) {
const factory = shaka.media.ManifestParser.parsersByMime[mimeType];
if (factory) {
return factory;
}
shaka.log.warning('Could not determine manifest type using MIME type',
mimeType);
}
}
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MANIFEST,
shaka.util.Error.Code.UNABLE_TO_GUESS_MANIFEST_TYPE,
uri);
}
/**
* @param {string} uri
* @param {!shaka.net.NetworkingEngine} netEngine
* @param {shaka.extern.RetryParameters} retryParams
* @return {!Promise.<string>}
*/
static async getMimeType(uri, netEngine, retryParams) {
const type = shaka.net.NetworkingEngine.RequestType.MANIFEST;
const request = shaka.net.NetworkingEngine.makeRequest([uri], retryParams);
request.method = 'HEAD';
const response = await netEngine.request(type, request).promise;
// https://bit.ly/2K9s9kf says this header should always be available,
// but just to be safe:
const mimeType = response.headers['content-type'];
return mimeType ? mimeType.toLowerCase().split(';').shift() : '';
}
/**
* @param {string} uri
* @return {string}
*/
static getExtension(uri) {
const uriObj = new goog.Uri(uri);
const uriPieces = uriObj.getPath().split('/');
const uriFilename = uriPieces.pop();
const filenamePieces = uriFilename.split('.');
// Only one piece means there is no extension.
if (filenamePieces.length == 1) {
return '';
}
return filenamePieces.pop().toLowerCase();
}
/**
* Determines whether or not this URI and MIME type are supported by our own
* manifest parsers on this platform. This takes into account whether or not
* MediaSource is available, as well as which parsers are registered to the
* system.
*
* @param {string} uri
* @param {string} mimeType
* @return {boolean}
*/
static isSupported(uri, mimeType) {
// Without MediaSource, our own parsers are useless.
if (!shaka.util.Platform.supportsMediaSource()) {
return false;
}
if (mimeType in shaka.media.ManifestParser.parsersByMime) {
return true;
}
const extension = shaka.media.ManifestParser.getExtension(uri);
if (extension in shaka.media.ManifestParser.parsersByExtension) {
return true;
}
return false;
}
};
/**
* @const {string}
*/
shaka.media.ManifestParser.HLS = 'HLS';
/**
* @const {string}
*/
shaka.media.ManifestParser.DASH = 'DASH';
/**
* @const {string}
*/
shaka.media.ManifestParser.MSS = 'MSS';
/**
* @const {string}
*/
shaka.media.ManifestParser.UNKNOWN = 'UNKNOWN';
/**
* @enum {string}
* @export
*/
shaka.media.ManifestParser.AccessibilityPurpose = {
VISUALLY_IMPAIRED: 'visually impaired',
HARD_OF_HEARING: 'hard of hearing',
};
/**
* Contains the parser factory functions indexed by MIME type.
*
* @type {!Object.<string, shaka.extern.ManifestParser.Factory>}
*/
shaka.media.ManifestParser.parsersByMime = {};
/**
* Contains the parser factory functions indexed by file extension.
*
* @type {!Object.<string, shaka.extern.ManifestParser.Factory>}
*/
shaka.media.ManifestParser.parsersByExtension = {};