/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.util.MimeUtils');
goog.require('shaka.dependencies');
goog.require('shaka.media.Transmuxer');
goog.require('shaka.util.ManifestParserUtils');
/**
* @summary A set of utility functions for dealing with MIME types.
*/
shaka.util.MimeUtils = class {
/**
* Takes a MIME type and optional codecs string and produces the full MIME
* type.
*
* @param {string} mimeType
* @param {string=} codecs
* @return {string}
*/
static getFullType(mimeType, codecs) {
let fullMimeType = mimeType;
if (codecs) {
fullMimeType += '; codecs="' + codecs + '"';
}
return fullMimeType;
}
/**
* Takes a MIME type and a codecs string and produces the full MIME
* type. If it's a transport stream, convert its codecs to MP4 codecs.
* Otherwise for multiplexed content, convert the video MIME types to
* their audio equivalents if the content type is audio.
*
* @param {string} mimeType
* @param {string} codecs
* @param {string} contentType
* @return {string}
*/
static getFullOrConvertedType(mimeType, codecs, contentType) {
const fullMimeType = shaka.util.MimeUtils.getFullType(mimeType, codecs);
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (shaka.media.Transmuxer.isTsContainer(fullMimeType)) {
if (shaka.dependencies.muxjs()) {
return shaka.media.Transmuxer.convertTsCodecs(
contentType, fullMimeType);
}
} else if (mimeType != 'video/mp2t' && contentType == ContentType.AUDIO) {
// video/mp2t is the correct mime type for TS audio, so only replace the
// word "video" with "audio" for non-TS audio content.
return fullMimeType.replace('video', 'audio');
}
return fullMimeType;
}
/**
* Takes a Stream object and produces an extended MIME type with information
* beyond the container and codec type, when available.
*
* @param {shaka.extern.Stream} stream
* @return {string}
*/
static getExtendedType(stream) {
const components = [stream.mimeType];
const extendedMimeParams = shaka.util.MimeUtils.EXTENDED_MIME_PARAMETERS_;
extendedMimeParams.forEach((mimeKey, streamKey) => {
const value = stream[streamKey];
if (value) {
components.push(mimeKey + '="' + value + '"');
}
});
if (stream.hdr == 'PQ') {
components.push('eotf="smpte2084"');
}
return components.join(';');
}
/**
* Takes a full MIME type (with codecs) or basic MIME type (without codecs)
* and returns a container type string ("mp2t", "mp4", "webm", etc.)
*
* @param {string} mimeType
* @return {string}
*/
static getContainerType(mimeType) {
return mimeType.split(';')[0].split('/')[1];
}
/**
* Split a list of codecs encoded in a string into a list of codecs.
* @param {string} codecs
* @return {!Array.<string>}
*/
static splitCodecs(codecs) {
return codecs.split(',');
}
/**
* Get the normalized codec from a codec string,
* independently of their container.
*
* @param {string} codecString
* @return {string}
*/
static getNormalizedCodec(codecString) {
const parts =
shaka.util.MimeUtils.getCodecParts_(codecString);
const base = parts[0];
const profile = parts[1].toLowerCase();
switch (true) {
case base === 'mp4a' && profile === '69':
case base === 'mp4a' && profile === '6b':
return 'mp3';
case base === 'mp4a' && profile === '66':
case base === 'mp4a' && profile === '67':
case base === 'mp4a' && profile === '68':
case base === 'mp4a' && profile === '40.2':
case base === 'mp4a' && profile === '40.02':
case base === 'mp4a' && profile === '40.5':
case base === 'mp4a' && profile === '40.05':
case base === 'mp4a' && profile === '40.29':
case base === 'mp4a' && profile === '40.42': // Extended HE-AAC
return 'aac';
case base === 'mp4a' && profile === 'a5':
return 'ac-3'; // Dolby Digital
case base === 'mp4a' && profile === 'a6':
return 'ec-3'; // Dolby Digital Plus
case base === 'mp4a' && profile === 'b2':
return 'dtsx'; // DTS:X
case base === 'mp4a' && profile === 'a9':
return 'dtsc'; // DTS Digital Surround
case base === 'avc1':
case base === 'avc3':
return 'avc'; // H264
case base === 'hvc1':
case base === 'hev1':
return 'hevc'; // H265
case base === 'dvh1':
case base === 'dvhe':
return 'dovi'; // Dolby Vision
}
return base;
}
/**
* Get the base codec from a codec string.
*
* @param {string} codecString
* @return {string}
*/
static getCodecBase(codecString) {
const parts = shaka.util.MimeUtils.getCodecParts_(codecString);
return parts[0];
}
/**
* Takes a full MIME type (with codecs) or basic MIME type (without codecs)
* and returns a basic MIME type (without codecs or other parameters).
*
* @param {string} mimeType
* @return {string}
*/
static getBasicType(mimeType) {
return mimeType.split(';')[0];
}
/**
* Takes a MIME type and returns the codecs parameter, or an empty string if
* there is no codecs parameter.
*
* @param {string} mimeType
* @return {string}
*/
static getCodecs(mimeType) {
// Parse the basic MIME type from its parameters.
const pieces = mimeType.split(/ *; */);
pieces.shift(); // Remove basic MIME type from pieces.
const codecs = pieces.find((piece) => piece.startsWith('codecs='));
if (!codecs) {
return '';
}
// The value may be quoted, so remove quotes at the beginning or end.
const value = codecs.split('=')[1].replace(/^"|"$/g, '');
return value;
}
/**
* Checks if the given MIME type is HLS MIME type.
*
* @param {string} mimeType
* @return {boolean}
*/
static isHlsType(mimeType) {
return mimeType === 'application/x-mpegurl' ||
mimeType === 'application/vnd.apple.mpegurl';
}
/**
* Get the base and profile of a codec string. Where [0] will be the codec
* base and [1] will be the profile.
* @param {string} codecString
* @return {!Array.<string>}
* @private
*/
static getCodecParts_(codecString) {
const parts = codecString.split('.');
const base = parts[0];
parts.shift();
const profile = parts.join('.');
// Make sure that we always return a "base" and "profile".
return [base, profile];
}
};
/**
* A map from Stream object keys to MIME type parameters. These should be
* ignored by platforms that do not recognize them.
*
* This initial set of parameters are all recognized by Chromecast.
*
* @const {!Map.<string, string>}
* @private
*/
shaka.util.MimeUtils.EXTENDED_MIME_PARAMETERS_ = new Map()
.set('codecs', 'codecs')
.set('frameRate', 'framerate') // Ours is camelCase, theirs is lowercase.
.set('bandwidth', 'bitrate') // They are in the same units: bits/sec.
.set('width', 'width')
.set('height', 'height')
.set('channelsCount', 'channels');
/**
* A mimetype created for CEA-608 closed captions.
* @const {string}
*/
shaka.util.MimeUtils.CEA608_CLOSED_CAPTION_MIMETYPE = 'application/cea-608';
/**
* A mimetype created for CEA-708 closed captions.
* @const {string}
*/
shaka.util.MimeUtils.CEA708_CLOSED_CAPTION_MIMETYPE = 'application/cea-708';