/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.transmuxer.MuxjsTransmuxer');
goog.require('goog.asserts');
goog.require('shaka.dependencies');
goog.require('shaka.media.Capabilities');
goog.require('shaka.transmuxer.TransmuxerEngine');
goog.require('shaka.util.BufferUtils');
goog.require('shaka.util.Error');
goog.require('shaka.util.ManifestParserUtils');
goog.require('shaka.util.PublicPromise');
goog.require('shaka.util.Uint8ArrayUtils');
/**
* @implements {shaka.extern.Transmuxer}
* @export
*/
shaka.transmuxer.MuxjsTransmuxer = class {
/**
* @param {string} mimeType
*/
constructor(mimeType) {
/** @private {string} */
this.originalMimeType_ = mimeType;
/** @private {?muxjs} */
this.muxjs_ = shaka.dependencies.muxjs();
/** @private {muxjs.mp4.Transmuxer} */
this.muxTransmuxer_ = null;
/** @private {shaka.util.PublicPromise} */
this.transmuxPromise_ = null;
/** @private {!Array.<!Uint8Array>} */
this.transmuxedData_ = [];
/** @private {boolean} */
this.isTransmuxing_ = false;
if (this.muxjs_) {
this.muxTransmuxer_ = new this.muxjs_.mp4.Transmuxer({
'keepOriginalTimestamps': true,
});
this.muxTransmuxer_.on('data', (segment) => this.onTransmuxed_(segment));
this.muxTransmuxer_.on('done', () => this.onTransmuxDone_());
}
}
/**
* @override
* @export
*/
destroy() {
if (this.muxTransmuxer_) {
this.muxTransmuxer_.dispose();
}
this.muxTransmuxer_ = null;
}
/**
* Check if the mime type and the content type is supported.
* @param {string} mimeType
* @param {string=} contentType
* @return {boolean}
* @override
* @export
*/
isSupported(mimeType, contentType) {
const Capabilities = shaka.media.Capabilities;
const isTs = this.isTsContainer_(mimeType);
if (!this.muxjs_ || !isTs) {
return false;
}
if (contentType) {
return Capabilities.isTypeSupported(
this.convertTsCodecs_(contentType, mimeType));
}
const ContentType = shaka.util.ManifestParserUtils.ContentType;
const audioMime = this.convertTsCodecs_(ContentType.AUDIO, mimeType);
const videoMime = this.convertTsCodecs_(ContentType.VIDEO, mimeType);
return Capabilities.isTypeSupported(audioMime) ||
Capabilities.isTypeSupported(videoMime);
}
/**
* Check if the mimetype contains 'mp2t'.
* @param {string} mimeType
* @return {boolean}
* @private
*/
isTsContainer_(mimeType) {
return mimeType.toLowerCase().split(';')[0].split('/')[1] == 'mp2t';
}
/**
* @override
* @export
*/
convertCodecs(contentType, mimeType) {
if (this.isTsContainer_(mimeType)) {
return this.convertTsCodecs_(contentType, mimeType);
}
return mimeType;
}
/**
* For transport stream, convert its codecs to MP4 codecs.
* @param {string} contentType
* @param {string} tsMimeType
* @return {string}
* @private
*/
convertTsCodecs_(contentType, tsMimeType) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
let mp4MimeType = tsMimeType.replace(/mp2t/i, 'mp4');
if (contentType == ContentType.AUDIO) {
mp4MimeType = mp4MimeType.replace('video', 'audio');
}
// Handle legacy AVC1 codec strings (pre-RFC 6381).
// Look for "avc1.<profile>.<level>", where profile is:
// 66 (baseline => 0x42)
// 77 (main => 0x4d)
// 100 (high => 0x64)
// Reference: https://bit.ly/2K9JI3x
const match = /avc1\.(66|77|100)\.(\d+)/.exec(mp4MimeType);
if (match) {
let newCodecString = 'avc1.';
const profile = match[1];
if (profile == '66') {
newCodecString += '4200';
} else if (profile == '77') {
newCodecString += '4d00';
} else {
goog.asserts.assert(profile == '100',
'Legacy avc1 parsing code out of sync with regex!');
newCodecString += '6400';
}
// Convert the level to hex and append to the codec string.
const level = Number(match[2]);
goog.asserts.assert(level < 256,
'Invalid legacy avc1 level number!');
newCodecString += (level >> 4).toString(16);
newCodecString += (level & 0xf).toString(16);
mp4MimeType = mp4MimeType.replace(match[0], newCodecString);
}
return mp4MimeType;
}
/**
* @override
* @export
*/
getOrginalMimeType() {
return this.originalMimeType_;
}
/**
* @override
* @export
*/
transmux(data) {
goog.asserts.assert(this.muxTransmuxer_,
'mux.js should be available.');
goog.asserts.assert(!this.isTransmuxing_,
'No transmuxing should be in progress.');
this.isTransmuxing_ = true;
this.transmuxPromise_ = new shaka.util.PublicPromise();
this.transmuxedData_ = [];
const dataArray = shaka.util.BufferUtils.toUint8(data);
this.muxTransmuxer_.push(dataArray);
this.muxTransmuxer_.flush();
// Workaround for https://bit.ly/Shaka1449 mux.js not
// emitting 'data' and 'done' events.
// mux.js code is synchronous, so if onTransmuxDone_ has
// not been called by now, it's not going to be.
// Treat it as a transmuxing failure and reject the promise.
if (this.isTransmuxing_) {
this.transmuxPromise_.reject(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MEDIA,
shaka.util.Error.Code.TRANSMUXING_FAILED));
}
return this.transmuxPromise_;
}
/**
* Handles the 'data' event of the transmuxer.
* Extracts the cues from the transmuxed segment, and adds them to an array.
* Stores the transmuxed data in another array, to pass it back to
* MediaSourceEngine, and append to the source buffer.
*
* @param {muxjs.mp4.Transmuxer.Segment} segment
* @private
*/
onTransmuxed_(segment) {
this.transmuxedData_.push(
shaka.util.Uint8ArrayUtils.concat(segment.initSegment, segment.data));
}
/**
* Handles the 'done' event of the transmuxer.
* Resolves the transmux Promise, and returns the transmuxed data.
* @private
*/
onTransmuxDone_() {
const data = shaka.util.Uint8ArrayUtils.concat(...this.transmuxedData_);
this.transmuxPromise_.resolve(data);
this.isTransmuxing_ = false;
}
};
shaka.transmuxer.TransmuxerEngine.registerTransmuxer(
'video/mp2t',
() => new shaka.transmuxer.MuxjsTransmuxer('video/mp2t'),
shaka.transmuxer.TransmuxerEngine.PluginPriority.FALLBACK);