@videojs/http-streaming
Version:
Play back HLS and DASH with Video.js, even where it's not natively supported
1,454 lines (1,218 loc) • 263 kB
JavaScript
/*! @name @videojs/http-streaming @version 2.5.0 @license Apache-2.0 */
var transmuxerWorker = (function () {
'use strict';
/**
* mux.js
*
* Copyright (c) Brightcove
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
*
* A lightweight readable stream implemention that handles event dispatching.
* Objects that inherit from streams should call init in their constructors.
*/
var Stream = function Stream() {
this.init = function () {
var listeners = {};
/**
* Add a listener for a specified event type.
* @param type {string} the event name
* @param listener {function} the callback to be invoked when an event of
* the specified type occurs
*/
this.on = function (type, listener) {
if (!listeners[type]) {
listeners[type] = [];
}
listeners[type] = listeners[type].concat(listener);
};
/**
* Remove a listener for a specified event type.
* @param type {string} the event name
* @param listener {function} a function previously registered for this
* type of event through `on`
*/
this.off = function (type, listener) {
var index;
if (!listeners[type]) {
return false;
}
index = listeners[type].indexOf(listener);
listeners[type] = listeners[type].slice();
listeners[type].splice(index, 1);
return index > -1;
};
/**
* Trigger an event of the specified type on this stream. Any additional
* arguments to this function are passed as parameters to event listeners.
* @param type {string} the event name
*/
this.trigger = function (type) {
var callbacks, i, length, args;
callbacks = listeners[type];
if (!callbacks) {
return;
} // Slicing the arguments on every invocation of this method
// can add a significant amount of overhead. Avoid the
// intermediate object creation for the common case of a
// single callback argument
if (arguments.length === 2) {
length = callbacks.length;
for (i = 0; i < length; ++i) {
callbacks[i].call(this, arguments[1]);
}
} else {
args = [];
i = arguments.length;
for (i = 1; i < arguments.length; ++i) {
args.push(arguments[i]);
}
length = callbacks.length;
for (i = 0; i < length; ++i) {
callbacks[i].apply(this, args);
}
}
};
/**
* Destroys the stream and cleans up.
*/
this.dispose = function () {
listeners = {};
};
};
};
/**
* Forwards all `data` events on this stream to the destination stream. The
* destination stream should provide a method `push` to receive the data
* events as they arrive.
* @param destination {stream} the stream that will receive all `data` events
* @param autoFlush {boolean} if false, we will not call `flush` on the destination
* when the current stream emits a 'done' event
* @see http://nodejs.org/api/stream.html#stream_readable_pipe_destination_options
*/
Stream.prototype.pipe = function (destination) {
this.on('data', function (data) {
destination.push(data);
});
this.on('done', function (flushSource) {
destination.flush(flushSource);
});
this.on('partialdone', function (flushSource) {
destination.partialFlush(flushSource);
});
this.on('endedtimeline', function (flushSource) {
destination.endTimeline(flushSource);
});
this.on('reset', function (flushSource) {
destination.reset(flushSource);
});
return destination;
}; // Default stream functions that are expected to be overridden to perform
// actual work. These are provided by the prototype as a sort of no-op
// implementation so that we don't have to check for their existence in the
// `pipe` function above.
Stream.prototype.push = function (data) {
this.trigger('data', data);
};
Stream.prototype.flush = function (flushSource) {
this.trigger('done', flushSource);
};
Stream.prototype.partialFlush = function (flushSource) {
this.trigger('partialdone', flushSource);
};
Stream.prototype.endTimeline = function (flushSource) {
this.trigger('endedtimeline', flushSource);
};
Stream.prototype.reset = function (flushSource) {
this.trigger('reset', flushSource);
};
var stream = Stream;
/**
* mux.js
*
* Copyright (c) Brightcove
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
*
* Functions that generate fragmented MP4s suitable for use with Media
* Source Extensions.
*/
var UINT32_MAX = Math.pow(2, 32) - 1;
var box, dinf, esds, ftyp, mdat, mfhd, minf, moof, moov, mvex, mvhd, trak, tkhd, mdia, mdhd, hdlr, sdtp, stbl, stsd, traf, trex, trun, types, MAJOR_BRAND, MINOR_VERSION, AVC1_BRAND, VIDEO_HDLR, AUDIO_HDLR, HDLR_TYPES, VMHD, SMHD, DREF, STCO, STSC, STSZ, STTS; // pre-calculate constants
(function () {
var i;
types = {
avc1: [],
// codingname
avcC: [],
btrt: [],
dinf: [],
dref: [],
esds: [],
ftyp: [],
hdlr: [],
mdat: [],
mdhd: [],
mdia: [],
mfhd: [],
minf: [],
moof: [],
moov: [],
mp4a: [],
// codingname
mvex: [],
mvhd: [],
pasp: [],
sdtp: [],
smhd: [],
stbl: [],
stco: [],
stsc: [],
stsd: [],
stsz: [],
stts: [],
styp: [],
tfdt: [],
tfhd: [],
traf: [],
trak: [],
trun: [],
trex: [],
tkhd: [],
vmhd: []
}; // In environments where Uint8Array is undefined (e.g., IE8), skip set up so that we
// don't throw an error
if (typeof Uint8Array === 'undefined') {
return;
}
for (i in types) {
if (types.hasOwnProperty(i)) {
types[i] = [i.charCodeAt(0), i.charCodeAt(1), i.charCodeAt(2), i.charCodeAt(3)];
}
}
MAJOR_BRAND = new Uint8Array(['i'.charCodeAt(0), 's'.charCodeAt(0), 'o'.charCodeAt(0), 'm'.charCodeAt(0)]);
AVC1_BRAND = new Uint8Array(['a'.charCodeAt(0), 'v'.charCodeAt(0), 'c'.charCodeAt(0), '1'.charCodeAt(0)]);
MINOR_VERSION = new Uint8Array([0, 0, 0, 1]);
VIDEO_HDLR = new Uint8Array([0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00, // pre_defined
0x76, 0x69, 0x64, 0x65, // handler_type: 'vide'
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x56, 0x69, 0x64, 0x65, 0x6f, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x72, 0x00 // name: 'VideoHandler'
]);
AUDIO_HDLR = new Uint8Array([0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00, // pre_defined
0x73, 0x6f, 0x75, 0x6e, // handler_type: 'soun'
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x53, 0x6f, 0x75, 0x6e, 0x64, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x72, 0x00 // name: 'SoundHandler'
]);
HDLR_TYPES = {
video: VIDEO_HDLR,
audio: AUDIO_HDLR
};
DREF = new Uint8Array([0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x01, // entry_count
0x00, 0x00, 0x00, 0x0c, // entry_size
0x75, 0x72, 0x6c, 0x20, // 'url' type
0x00, // version 0
0x00, 0x00, 0x01 // entry_flags
]);
SMHD = new Uint8Array([0x00, // version
0x00, 0x00, 0x00, // flags
0x00, 0x00, // balance, 0 means centered
0x00, 0x00 // reserved
]);
STCO = new Uint8Array([0x00, // version
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00 // entry_count
]);
STSC = STCO;
STSZ = new Uint8Array([0x00, // version
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00, // sample_size
0x00, 0x00, 0x00, 0x00 // sample_count
]);
STTS = STCO;
VMHD = new Uint8Array([0x00, // version
0x00, 0x00, 0x01, // flags
0x00, 0x00, // graphicsmode
0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // opcolor
]);
})();
box = function box(type) {
var payload = [],
size = 0,
i,
result,
view;
for (i = 1; i < arguments.length; i++) {
payload.push(arguments[i]);
}
i = payload.length; // calculate the total size we need to allocate
while (i--) {
size += payload[i].byteLength;
}
result = new Uint8Array(size + 8);
view = new DataView(result.buffer, result.byteOffset, result.byteLength);
view.setUint32(0, result.byteLength);
result.set(type, 4); // copy the payload into the result
for (i = 0, size = 8; i < payload.length; i++) {
result.set(payload[i], size);
size += payload[i].byteLength;
}
return result;
};
dinf = function dinf() {
return box(types.dinf, box(types.dref, DREF));
};
esds = function esds(track) {
return box(types.esds, new Uint8Array([0x00, // version
0x00, 0x00, 0x00, // flags
// ES_Descriptor
0x03, // tag, ES_DescrTag
0x19, // length
0x00, 0x00, // ES_ID
0x00, // streamDependenceFlag, URL_flag, reserved, streamPriority
// DecoderConfigDescriptor
0x04, // tag, DecoderConfigDescrTag
0x11, // length
0x40, // object type
0x15, // streamType
0x00, 0x06, 0x00, // bufferSizeDB
0x00, 0x00, 0xda, 0xc0, // maxBitrate
0x00, 0x00, 0xda, 0xc0, // avgBitrate
// DecoderSpecificInfo
0x05, // tag, DecoderSpecificInfoTag
0x02, // length
// ISO/IEC 14496-3, AudioSpecificConfig
// for samplingFrequencyIndex see ISO/IEC 13818-7:2006, 8.1.3.2.2, Table 35
track.audioobjecttype << 3 | track.samplingfrequencyindex >>> 1, track.samplingfrequencyindex << 7 | track.channelcount << 3, 0x06, 0x01, 0x02 // GASpecificConfig
]));
};
ftyp = function ftyp() {
return box(types.ftyp, MAJOR_BRAND, MINOR_VERSION, MAJOR_BRAND, AVC1_BRAND);
};
hdlr = function hdlr(type) {
return box(types.hdlr, HDLR_TYPES[type]);
};
mdat = function mdat(data) {
return box(types.mdat, data);
};
mdhd = function mdhd(track) {
var result = new Uint8Array([0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x02, // creation_time
0x00, 0x00, 0x00, 0x03, // modification_time
0x00, 0x01, 0x5f, 0x90, // timescale, 90,000 "ticks" per second
track.duration >>> 24 & 0xFF, track.duration >>> 16 & 0xFF, track.duration >>> 8 & 0xFF, track.duration & 0xFF, // duration
0x55, 0xc4, // 'und' language (undetermined)
0x00, 0x00]); // Use the sample rate from the track metadata, when it is
// defined. The sample rate can be parsed out of an ADTS header, for
// instance.
if (track.samplerate) {
result[12] = track.samplerate >>> 24 & 0xFF;
result[13] = track.samplerate >>> 16 & 0xFF;
result[14] = track.samplerate >>> 8 & 0xFF;
result[15] = track.samplerate & 0xFF;
}
return box(types.mdhd, result);
};
mdia = function mdia(track) {
return box(types.mdia, mdhd(track), hdlr(track.type), minf(track));
};
mfhd = function mfhd(sequenceNumber) {
return box(types.mfhd, new Uint8Array([0x00, 0x00, 0x00, 0x00, // flags
(sequenceNumber & 0xFF000000) >> 24, (sequenceNumber & 0xFF0000) >> 16, (sequenceNumber & 0xFF00) >> 8, sequenceNumber & 0xFF // sequence_number
]));
};
minf = function minf(track) {
return box(types.minf, track.type === 'video' ? box(types.vmhd, VMHD) : box(types.smhd, SMHD), dinf(), stbl(track));
};
moof = function moof(sequenceNumber, tracks) {
var trackFragments = [],
i = tracks.length; // build traf boxes for each track fragment
while (i--) {
trackFragments[i] = traf(tracks[i]);
}
return box.apply(null, [types.moof, mfhd(sequenceNumber)].concat(trackFragments));
};
/**
* Returns a movie box.
* @param tracks {array} the tracks associated with this movie
* @see ISO/IEC 14496-12:2012(E), section 8.2.1
*/
moov = function moov(tracks) {
var i = tracks.length,
boxes = [];
while (i--) {
boxes[i] = trak(tracks[i]);
}
return box.apply(null, [types.moov, mvhd(0xffffffff)].concat(boxes).concat(mvex(tracks)));
};
mvex = function mvex(tracks) {
var i = tracks.length,
boxes = [];
while (i--) {
boxes[i] = trex(tracks[i]);
}
return box.apply(null, [types.mvex].concat(boxes));
};
mvhd = function mvhd(duration) {
var bytes = new Uint8Array([0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x01, // creation_time
0x00, 0x00, 0x00, 0x02, // modification_time
0x00, 0x01, 0x5f, 0x90, // timescale, 90,000 "ticks" per second
(duration & 0xFF000000) >> 24, (duration & 0xFF0000) >> 16, (duration & 0xFF00) >> 8, duration & 0xFF, // duration
0x00, 0x01, 0x00, 0x00, // 1.0 rate
0x01, 0x00, // 1.0 volume
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, // transformation: unity matrix
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // pre_defined
0xff, 0xff, 0xff, 0xff // next_track_ID
]);
return box(types.mvhd, bytes);
};
sdtp = function sdtp(track) {
var samples = track.samples || [],
bytes = new Uint8Array(4 + samples.length),
flags,
i; // leave the full box header (4 bytes) all zero
// write the sample table
for (i = 0; i < samples.length; i++) {
flags = samples[i].flags;
bytes[i + 4] = flags.dependsOn << 4 | flags.isDependedOn << 2 | flags.hasRedundancy;
}
return box(types.sdtp, bytes);
};
stbl = function stbl(track) {
return box(types.stbl, stsd(track), box(types.stts, STTS), box(types.stsc, STSC), box(types.stsz, STSZ), box(types.stco, STCO));
};
(function () {
var videoSample, audioSample;
stsd = function stsd(track) {
return box(types.stsd, new Uint8Array([0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x01]), track.type === 'video' ? videoSample(track) : audioSample(track));
};
videoSample = function videoSample(track) {
var sps = track.sps || [],
pps = track.pps || [],
sequenceParameterSets = [],
pictureParameterSets = [],
i,
avc1Box; // assemble the SPSs
for (i = 0; i < sps.length; i++) {
sequenceParameterSets.push((sps[i].byteLength & 0xFF00) >>> 8);
sequenceParameterSets.push(sps[i].byteLength & 0xFF); // sequenceParameterSetLength
sequenceParameterSets = sequenceParameterSets.concat(Array.prototype.slice.call(sps[i])); // SPS
} // assemble the PPSs
for (i = 0; i < pps.length; i++) {
pictureParameterSets.push((pps[i].byteLength & 0xFF00) >>> 8);
pictureParameterSets.push(pps[i].byteLength & 0xFF);
pictureParameterSets = pictureParameterSets.concat(Array.prototype.slice.call(pps[i]));
}
avc1Box = [types.avc1, new Uint8Array([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x01, // data_reference_index
0x00, 0x00, // pre_defined
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // pre_defined
(track.width & 0xff00) >> 8, track.width & 0xff, // width
(track.height & 0xff00) >> 8, track.height & 0xff, // height
0x00, 0x48, 0x00, 0x00, // horizresolution
0x00, 0x48, 0x00, 0x00, // vertresolution
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x01, // frame_count
0x13, 0x76, 0x69, 0x64, 0x65, 0x6f, 0x6a, 0x73, 0x2d, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x69, 0x62, 0x2d, 0x68, 0x6c, 0x73, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // compressorname
0x00, 0x18, // depth = 24
0x11, 0x11 // pre_defined = -1
]), box(types.avcC, new Uint8Array([0x01, // configurationVersion
track.profileIdc, // AVCProfileIndication
track.profileCompatibility, // profile_compatibility
track.levelIdc, // AVCLevelIndication
0xff // lengthSizeMinusOne, hard-coded to 4 bytes
].concat([sps.length], // numOfSequenceParameterSets
sequenceParameterSets, // "SPS"
[pps.length], // numOfPictureParameterSets
pictureParameterSets // "PPS"
))), box(types.btrt, new Uint8Array([0x00, 0x1c, 0x9c, 0x80, // bufferSizeDB
0x00, 0x2d, 0xc6, 0xc0, // maxBitrate
0x00, 0x2d, 0xc6, 0xc0 // avgBitrate
]))];
if (track.sarRatio) {
var hSpacing = track.sarRatio[0],
vSpacing = track.sarRatio[1];
avc1Box.push(box(types.pasp, new Uint8Array([(hSpacing & 0xFF000000) >> 24, (hSpacing & 0xFF0000) >> 16, (hSpacing & 0xFF00) >> 8, hSpacing & 0xFF, (vSpacing & 0xFF000000) >> 24, (vSpacing & 0xFF0000) >> 16, (vSpacing & 0xFF00) >> 8, vSpacing & 0xFF])));
}
return box.apply(null, avc1Box);
};
audioSample = function audioSample(track) {
return box(types.mp4a, new Uint8Array([// SampleEntry, ISO/IEC 14496-12
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x01, // data_reference_index
// AudioSampleEntry, ISO/IEC 14496-12
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
(track.channelcount & 0xff00) >> 8, track.channelcount & 0xff, // channelcount
(track.samplesize & 0xff00) >> 8, track.samplesize & 0xff, // samplesize
0x00, 0x00, // pre_defined
0x00, 0x00, // reserved
(track.samplerate & 0xff00) >> 8, track.samplerate & 0xff, 0x00, 0x00 // samplerate, 16.16
// MP4AudioSampleEntry, ISO/IEC 14496-14
]), esds(track));
};
})();
tkhd = function tkhd(track) {
var result = new Uint8Array([0x00, // version 0
0x00, 0x00, 0x07, // flags
0x00, 0x00, 0x00, 0x00, // creation_time
0x00, 0x00, 0x00, 0x00, // modification_time
(track.id & 0xFF000000) >> 24, (track.id & 0xFF0000) >> 16, (track.id & 0xFF00) >> 8, track.id & 0xFF, // track_ID
0x00, 0x00, 0x00, 0x00, // reserved
(track.duration & 0xFF000000) >> 24, (track.duration & 0xFF0000) >> 16, (track.duration & 0xFF00) >> 8, track.duration & 0xFF, // duration
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, // layer
0x00, 0x00, // alternate_group
0x01, 0x00, // non-audio track volume
0x00, 0x00, // reserved
0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, // transformation: unity matrix
(track.width & 0xFF00) >> 8, track.width & 0xFF, 0x00, 0x00, // width
(track.height & 0xFF00) >> 8, track.height & 0xFF, 0x00, 0x00 // height
]);
return box(types.tkhd, result);
};
/**
* Generate a track fragment (traf) box. A traf box collects metadata
* about tracks in a movie fragment (moof) box.
*/
traf = function traf(track) {
var trackFragmentHeader, trackFragmentDecodeTime, trackFragmentRun, sampleDependencyTable, dataOffset, upperWordBaseMediaDecodeTime, lowerWordBaseMediaDecodeTime;
trackFragmentHeader = box(types.tfhd, new Uint8Array([0x00, // version 0
0x00, 0x00, 0x3a, // flags
(track.id & 0xFF000000) >> 24, (track.id & 0xFF0000) >> 16, (track.id & 0xFF00) >> 8, track.id & 0xFF, // track_ID
0x00, 0x00, 0x00, 0x01, // sample_description_index
0x00, 0x00, 0x00, 0x00, // default_sample_duration
0x00, 0x00, 0x00, 0x00, // default_sample_size
0x00, 0x00, 0x00, 0x00 // default_sample_flags
]));
upperWordBaseMediaDecodeTime = Math.floor(track.baseMediaDecodeTime / (UINT32_MAX + 1));
lowerWordBaseMediaDecodeTime = Math.floor(track.baseMediaDecodeTime % (UINT32_MAX + 1));
trackFragmentDecodeTime = box(types.tfdt, new Uint8Array([0x01, // version 1
0x00, 0x00, 0x00, // flags
// baseMediaDecodeTime
upperWordBaseMediaDecodeTime >>> 24 & 0xFF, upperWordBaseMediaDecodeTime >>> 16 & 0xFF, upperWordBaseMediaDecodeTime >>> 8 & 0xFF, upperWordBaseMediaDecodeTime & 0xFF, lowerWordBaseMediaDecodeTime >>> 24 & 0xFF, lowerWordBaseMediaDecodeTime >>> 16 & 0xFF, lowerWordBaseMediaDecodeTime >>> 8 & 0xFF, lowerWordBaseMediaDecodeTime & 0xFF])); // the data offset specifies the number of bytes from the start of
// the containing moof to the first payload byte of the associated
// mdat
dataOffset = 32 + // tfhd
20 + // tfdt
8 + // traf header
16 + // mfhd
8 + // moof header
8; // mdat header
// audio tracks require less metadata
if (track.type === 'audio') {
trackFragmentRun = trun(track, dataOffset);
return box(types.traf, trackFragmentHeader, trackFragmentDecodeTime, trackFragmentRun);
} // video tracks should contain an independent and disposable samples
// box (sdtp)
// generate one and adjust offsets to match
sampleDependencyTable = sdtp(track);
trackFragmentRun = trun(track, sampleDependencyTable.length + dataOffset);
return box(types.traf, trackFragmentHeader, trackFragmentDecodeTime, trackFragmentRun, sampleDependencyTable);
};
/**
* Generate a track box.
* @param track {object} a track definition
* @return {Uint8Array} the track box
*/
trak = function trak(track) {
track.duration = track.duration || 0xffffffff;
return box(types.trak, tkhd(track), mdia(track));
};
trex = function trex(track) {
var result = new Uint8Array([0x00, // version 0
0x00, 0x00, 0x00, // flags
(track.id & 0xFF000000) >> 24, (track.id & 0xFF0000) >> 16, (track.id & 0xFF00) >> 8, track.id & 0xFF, // track_ID
0x00, 0x00, 0x00, 0x01, // default_sample_description_index
0x00, 0x00, 0x00, 0x00, // default_sample_duration
0x00, 0x00, 0x00, 0x00, // default_sample_size
0x00, 0x01, 0x00, 0x01 // default_sample_flags
]); // the last two bytes of default_sample_flags is the sample
// degradation priority, a hint about the importance of this sample
// relative to others. Lower the degradation priority for all sample
// types other than video.
if (track.type !== 'video') {
result[result.length - 1] = 0x00;
}
return box(types.trex, result);
};
(function () {
var audioTrun, videoTrun, trunHeader; // This method assumes all samples are uniform. That is, if a
// duration is present for the first sample, it will be present for
// all subsequent samples.
// see ISO/IEC 14496-12:2012, Section 8.8.8.1
trunHeader = function trunHeader(samples, offset) {
var durationPresent = 0,
sizePresent = 0,
flagsPresent = 0,
compositionTimeOffset = 0; // trun flag constants
if (samples.length) {
if (samples[0].duration !== undefined) {
durationPresent = 0x1;
}
if (samples[0].size !== undefined) {
sizePresent = 0x2;
}
if (samples[0].flags !== undefined) {
flagsPresent = 0x4;
}
if (samples[0].compositionTimeOffset !== undefined) {
compositionTimeOffset = 0x8;
}
}
return [0x00, // version 0
0x00, durationPresent | sizePresent | flagsPresent | compositionTimeOffset, 0x01, // flags
(samples.length & 0xFF000000) >>> 24, (samples.length & 0xFF0000) >>> 16, (samples.length & 0xFF00) >>> 8, samples.length & 0xFF, // sample_count
(offset & 0xFF000000) >>> 24, (offset & 0xFF0000) >>> 16, (offset & 0xFF00) >>> 8, offset & 0xFF // data_offset
];
};
videoTrun = function videoTrun(track, offset) {
var bytesOffest, bytes, header, samples, sample, i;
samples = track.samples || [];
offset += 8 + 12 + 16 * samples.length;
header = trunHeader(samples, offset);
bytes = new Uint8Array(header.length + samples.length * 16);
bytes.set(header);
bytesOffest = header.length;
for (i = 0; i < samples.length; i++) {
sample = samples[i];
bytes[bytesOffest++] = (sample.duration & 0xFF000000) >>> 24;
bytes[bytesOffest++] = (sample.duration & 0xFF0000) >>> 16;
bytes[bytesOffest++] = (sample.duration & 0xFF00) >>> 8;
bytes[bytesOffest++] = sample.duration & 0xFF; // sample_duration
bytes[bytesOffest++] = (sample.size & 0xFF000000) >>> 24;
bytes[bytesOffest++] = (sample.size & 0xFF0000) >>> 16;
bytes[bytesOffest++] = (sample.size & 0xFF00) >>> 8;
bytes[bytesOffest++] = sample.size & 0xFF; // sample_size
bytes[bytesOffest++] = sample.flags.isLeading << 2 | sample.flags.dependsOn;
bytes[bytesOffest++] = sample.flags.isDependedOn << 6 | sample.flags.hasRedundancy << 4 | sample.flags.paddingValue << 1 | sample.flags.isNonSyncSample;
bytes[bytesOffest++] = sample.flags.degradationPriority & 0xF0 << 8;
bytes[bytesOffest++] = sample.flags.degradationPriority & 0x0F; // sample_flags
bytes[bytesOffest++] = (sample.compositionTimeOffset & 0xFF000000) >>> 24;
bytes[bytesOffest++] = (sample.compositionTimeOffset & 0xFF0000) >>> 16;
bytes[bytesOffest++] = (sample.compositionTimeOffset & 0xFF00) >>> 8;
bytes[bytesOffest++] = sample.compositionTimeOffset & 0xFF; // sample_composition_time_offset
}
return box(types.trun, bytes);
};
audioTrun = function audioTrun(track, offset) {
var bytes, bytesOffest, header, samples, sample, i;
samples = track.samples || [];
offset += 8 + 12 + 8 * samples.length;
header = trunHeader(samples, offset);
bytes = new Uint8Array(header.length + samples.length * 8);
bytes.set(header);
bytesOffest = header.length;
for (i = 0; i < samples.length; i++) {
sample = samples[i];
bytes[bytesOffest++] = (sample.duration & 0xFF000000) >>> 24;
bytes[bytesOffest++] = (sample.duration & 0xFF0000) >>> 16;
bytes[bytesOffest++] = (sample.duration & 0xFF00) >>> 8;
bytes[bytesOffest++] = sample.duration & 0xFF; // sample_duration
bytes[bytesOffest++] = (sample.size & 0xFF000000) >>> 24;
bytes[bytesOffest++] = (sample.size & 0xFF0000) >>> 16;
bytes[bytesOffest++] = (sample.size & 0xFF00) >>> 8;
bytes[bytesOffest++] = sample.size & 0xFF; // sample_size
}
return box(types.trun, bytes);
};
trun = function trun(track, offset) {
if (track.type === 'audio') {
return audioTrun(track, offset);
}
return videoTrun(track, offset);
};
})();
var mp4Generator = {
ftyp: ftyp,
mdat: mdat,
moof: moof,
moov: moov,
initSegment: function initSegment(tracks) {
var fileType = ftyp(),
movie = moov(tracks),
result;
result = new Uint8Array(fileType.byteLength + movie.byteLength);
result.set(fileType);
result.set(movie, fileType.byteLength);
return result;
}
};
/**
* mux.js
*
* Copyright (c) Brightcove
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
*/
// Convert an array of nal units into an array of frames with each frame being
// composed of the nal units that make up that frame
// Also keep track of cummulative data about the frame from the nal units such
// as the frame duration, starting pts, etc.
var groupNalsIntoFrames = function groupNalsIntoFrames(nalUnits) {
var i,
currentNal,
currentFrame = [],
frames = []; // TODO added for LHLS, make sure this is OK
frames.byteLength = 0;
frames.nalCount = 0;
frames.duration = 0;
currentFrame.byteLength = 0;
for (i = 0; i < nalUnits.length; i++) {
currentNal = nalUnits[i]; // Split on 'aud'-type nal units
if (currentNal.nalUnitType === 'access_unit_delimiter_rbsp') {
// Since the very first nal unit is expected to be an AUD
// only push to the frames array when currentFrame is not empty
if (currentFrame.length) {
currentFrame.duration = currentNal.dts - currentFrame.dts; // TODO added for LHLS, make sure this is OK
frames.byteLength += currentFrame.byteLength;
frames.nalCount += currentFrame.length;
frames.duration += currentFrame.duration;
frames.push(currentFrame);
}
currentFrame = [currentNal];
currentFrame.byteLength = currentNal.data.byteLength;
currentFrame.pts = currentNal.pts;
currentFrame.dts = currentNal.dts;
} else {
// Specifically flag key frames for ease of use later
if (currentNal.nalUnitType === 'slice_layer_without_partitioning_rbsp_idr') {
currentFrame.keyFrame = true;
}
currentFrame.duration = currentNal.dts - currentFrame.dts;
currentFrame.byteLength += currentNal.data.byteLength;
currentFrame.push(currentNal);
}
} // For the last frame, use the duration of the previous frame if we
// have nothing better to go on
if (frames.length && (!currentFrame.duration || currentFrame.duration <= 0)) {
currentFrame.duration = frames[frames.length - 1].duration;
} // Push the final frame
// TODO added for LHLS, make sure this is OK
frames.byteLength += currentFrame.byteLength;
frames.nalCount += currentFrame.length;
frames.duration += currentFrame.duration;
frames.push(currentFrame);
return frames;
}; // Convert an array of frames into an array of Gop with each Gop being composed
// of the frames that make up that Gop
// Also keep track of cummulative data about the Gop from the frames such as the
// Gop duration, starting pts, etc.
var groupFramesIntoGops = function groupFramesIntoGops(frames) {
var i,
currentFrame,
currentGop = [],
gops = []; // We must pre-set some of the values on the Gop since we
// keep running totals of these values
currentGop.byteLength = 0;
currentGop.nalCount = 0;
currentGop.duration = 0;
currentGop.pts = frames[0].pts;
currentGop.dts = frames[0].dts; // store some metadata about all the Gops
gops.byteLength = 0;
gops.nalCount = 0;
gops.duration = 0;
gops.pts = frames[0].pts;
gops.dts = frames[0].dts;
for (i = 0; i < frames.length; i++) {
currentFrame = frames[i];
if (currentFrame.keyFrame) {
// Since the very first frame is expected to be an keyframe
// only push to the gops array when currentGop is not empty
if (currentGop.length) {
gops.push(currentGop);
gops.byteLength += currentGop.byteLength;
gops.nalCount += currentGop.nalCount;
gops.duration += currentGop.duration;
}
currentGop = [currentFrame];
currentGop.nalCount = currentFrame.length;
currentGop.byteLength = currentFrame.byteLength;
currentGop.pts = currentFrame.pts;
currentGop.dts = currentFrame.dts;
currentGop.duration = currentFrame.duration;
} else {
currentGop.duration += currentFrame.duration;
currentGop.nalCount += currentFrame.length;
currentGop.byteLength += currentFrame.byteLength;
currentGop.push(currentFrame);
}
}
if (gops.length && currentGop.duration <= 0) {
currentGop.duration = gops[gops.length - 1].duration;
}
gops.byteLength += currentGop.byteLength;
gops.nalCount += currentGop.nalCount;
gops.duration += currentGop.duration; // push the final Gop
gops.push(currentGop);
return gops;
};
/*
* Search for the first keyframe in the GOPs and throw away all frames
* until that keyframe. Then extend the duration of the pulled keyframe
* and pull the PTS and DTS of the keyframe so that it covers the time
* range of the frames that were disposed.
*
* @param {Array} gops video GOPs
* @returns {Array} modified video GOPs
*/
var extendFirstKeyFrame = function extendFirstKeyFrame(gops) {
var currentGop;
if (!gops[0][0].keyFrame && gops.length > 1) {
// Remove the first GOP
currentGop = gops.shift();
gops.byteLength -= currentGop.byteLength;
gops.nalCount -= currentGop.nalCount; // Extend the first frame of what is now the
// first gop to cover the time period of the
// frames we just removed
gops[0][0].dts = currentGop.dts;
gops[0][0].pts = currentGop.pts;
gops[0][0].duration += currentGop.duration;
}
return gops;
};
/**
* Default sample object
* see ISO/IEC 14496-12:2012, section 8.6.4.3
*/
var createDefaultSample = function createDefaultSample() {
return {
size: 0,
flags: {
isLeading: 0,
dependsOn: 1,
isDependedOn: 0,
hasRedundancy: 0,
degradationPriority: 0,
isNonSyncSample: 1
}
};
};
/*
* Collates information from a video frame into an object for eventual
* entry into an MP4 sample table.
*
* @param {Object} frame the video frame
* @param {Number} dataOffset the byte offset to position the sample
* @return {Object} object containing sample table info for a frame
*/
var sampleForFrame = function sampleForFrame(frame, dataOffset) {
var sample = createDefaultSample();
sample.dataOffset = dataOffset;
sample.compositionTimeOffset = frame.pts - frame.dts;
sample.duration = frame.duration;
sample.size = 4 * frame.length; // Space for nal unit size
sample.size += frame.byteLength;
if (frame.keyFrame) {
sample.flags.dependsOn = 2;
sample.flags.isNonSyncSample = 0;
}
return sample;
}; // generate the track's sample table from an array of gops
var generateSampleTable = function generateSampleTable(gops, baseDataOffset) {
var h,
i,
sample,
currentGop,
currentFrame,
dataOffset = baseDataOffset || 0,
samples = [];
for (h = 0; h < gops.length; h++) {
currentGop = gops[h];
for (i = 0; i < currentGop.length; i++) {
currentFrame = currentGop[i];
sample = sampleForFrame(currentFrame, dataOffset);
dataOffset += sample.size;
samples.push(sample);
}
}
return samples;
}; // generate the track's raw mdat data from an array of gops
var concatenateNalData = function concatenateNalData(gops) {
var h,
i,
j,
currentGop,
currentFrame,
currentNal,
dataOffset = 0,
nalsByteLength = gops.byteLength,
numberOfNals = gops.nalCount,
totalByteLength = nalsByteLength + 4 * numberOfNals,
data = new Uint8Array(totalByteLength),
view = new DataView(data.buffer); // For each Gop..
for (h = 0; h < gops.length; h++) {
currentGop = gops[h]; // For each Frame..
for (i = 0; i < currentGop.length; i++) {
currentFrame = currentGop[i]; // For each NAL..
for (j = 0; j < currentFrame.length; j++) {
currentNal = currentFrame[j];
view.setUint32(dataOffset, currentNal.data.byteLength);
dataOffset += 4;
data.set(currentNal.data, dataOffset);
dataOffset += currentNal.data.byteLength;
}
}
}
return data;
}; // generate the track's sample table from a frame
var generateSampleTableForFrame = function generateSampleTableForFrame(frame, baseDataOffset) {
var sample,
dataOffset = baseDataOffset || 0,
samples = [];
sample = sampleForFrame(frame, dataOffset);
samples.push(sample);
return samples;
}; // generate the track's raw mdat data from a frame
var concatenateNalDataForFrame = function concatenateNalDataForFrame(frame) {
var i,
currentNal,
dataOffset = 0,
nalsByteLength = frame.byteLength,
numberOfNals = frame.length,
totalByteLength = nalsByteLength + 4 * numberOfNals,
data = new Uint8Array(totalByteLength),
view = new DataView(data.buffer); // For each NAL..
for (i = 0; i < frame.length; i++) {
currentNal = frame[i];
view.setUint32(dataOffset, currentNal.data.byteLength);
dataOffset += 4;
data.set(currentNal.data, dataOffset);
dataOffset += currentNal.data.byteLength;
}
return data;
};
var frameUtils = {
groupNalsIntoFrames: groupNalsIntoFrames,
groupFramesIntoGops: groupFramesIntoGops,
extendFirstKeyFrame: extendFirstKeyFrame,
generateSampleTable: generateSampleTable,
concatenateNalData: concatenateNalData,
generateSampleTableForFrame: generateSampleTableForFrame,
concatenateNalDataForFrame: concatenateNalDataForFrame
};
/**
* mux.js
*
* Copyright (c) Brightcove
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
*/
var highPrefix = [33, 16, 5, 32, 164, 27];
var lowPrefix = [33, 65, 108, 84, 1, 2, 4, 8, 168, 2, 4, 8, 17, 191, 252];
var zeroFill = function zeroFill(count) {
var a = [];
while (count--) {
a.push(0);
}
return a;
};
var makeTable = function makeTable(metaTable) {
return Object.keys(metaTable).reduce(function (obj, key) {
obj[key] = new Uint8Array(metaTable[key].reduce(function (arr, part) {
return arr.concat(part);
}, []));
return obj;
}, {});
};
var silence;
var silence_1 = function silence_1() {
if (!silence) {
// Frames-of-silence to use for filling in missing AAC frames
var coneOfSilence = {
96000: [highPrefix, [227, 64], zeroFill(154), [56]],
88200: [highPrefix, [231], zeroFill(170), [56]],
64000: [highPrefix, [248, 192], zeroFill(240), [56]],
48000: [highPrefix, [255, 192], zeroFill(268), [55, 148, 128], zeroFill(54), [112]],
44100: [highPrefix, [255, 192], zeroFill(268), [55, 163, 128], zeroFill(84), [112]],
32000: [highPrefix, [255, 192], zeroFill(268), [55, 234], zeroFill(226), [112]],
24000: [highPrefix, [255, 192], zeroFill(268), [55, 255, 128], zeroFill(268), [111, 112], zeroFill(126), [224]],
16000: [highPrefix, [255, 192], zeroFill(268), [55, 255, 128], zeroFill(268), [111, 255], zeroFill(269), [223, 108], zeroFill(195), [1, 192]],
12000: [lowPrefix, zeroFill(268), [3, 127, 248], zeroFill(268), [6, 255, 240], zeroFill(268), [13, 255, 224], zeroFill(268), [27, 253, 128], zeroFill(259), [56]],
11025: [lowPrefix, zeroFill(268), [3, 127, 248], zeroFill(268), [6, 255, 240], zeroFill(268), [13, 255, 224], zeroFill(268), [27, 255, 192], zeroFill(268), [55, 175, 128], zeroFill(108), [112]],
8000: [lowPrefix, zeroFill(268), [3, 121, 16], zeroFill(47), [7]]
};
silence = makeTable(coneOfSilence);
}
return silence;
};
/**
* mux.js
*
* Copyright (c) Brightcove
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
*/
var ONE_SECOND_IN_TS = 90000,
// 90kHz clock
secondsToVideoTs,
secondsToAudioTs,
videoTsToSeconds,
audioTsToSeconds,
audioTsToVideoTs,
videoTsToAudioTs,
metadataTsToSeconds;
secondsToVideoTs = function secondsToVideoTs(seconds) {
return seconds * ONE_SECOND_IN_TS;
};
secondsToAudioTs = function secondsToAudioTs(seconds, sampleRate) {
return seconds * sampleRate;
};
videoTsToSeconds = function videoTsToSeconds(timestamp) {
return timestamp / ONE_SECOND_IN_TS;
};
audioTsToSeconds = function audioTsToSeconds(timestamp, sampleRate) {
return timestamp / sampleRate;
};
audioTsToVideoTs = function audioTsToVideoTs(timestamp, sampleRate) {
return secondsToVideoTs(audioTsToSeconds(timestamp, sampleRate));
};
videoTsToAudioTs = function videoTsToAudioTs(timestamp, sampleRate) {
return secondsToAudioTs(videoTsToSeconds(timestamp), sampleRate);
};
/**
* Adjust ID3 tag or caption timing information by the timeline pts values
* (if keepOriginalTimestamps is false) and convert to seconds
*/
metadataTsToSeconds = function metadataTsToSeconds(timestamp, timelineStartPts, keepOriginalTimestamps) {
return videoTsToSeconds(keepOriginalTimestamps ? timestamp : timestamp - timelineStartPts);
};
var clock = {
ONE_SECOND_IN_TS: ONE_SECOND_IN_TS,
secondsToVideoTs: secondsToVideoTs,
secondsToAudioTs: secondsToAudioTs,
videoTsToSeconds: videoTsToSeconds,
audioTsToSeconds: audioTsToSeconds,
audioTsToVideoTs: audioTsToVideoTs,
videoTsToAudioTs: videoTsToAudioTs,
metadataTsToSeconds: metadataTsToSeconds
};
/**
* mux.js
*
* Copyright (c) Brightcove
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
*/
/**
* Sum the `byteLength` properties of the data in each AAC frame
*/
var sumFrameByteLengths = function sumFrameByteLengths(array) {
var i,
currentObj,
sum = 0; // sum the byteLength's all each nal unit in the frame
for (i = 0; i < array.length; i++) {
currentObj = array[i];
sum += currentObj.data.byteLength;
}
return sum;
}; // Possibly pad (prefix) the audio track with silence if appending this track
// would lead to the introduction of a gap in the audio buffer
var prefixWithSilence = function prefixWithSilence(track, frames, audioAppendStartTs, videoBaseMediaDecodeTime) {
var baseMediaDecodeTimeTs,
frameDuration = 0,
audioGapDuration = 0,
audioFillFrameCount = 0,
audioFillDuration = 0,
silentFrame,
i,
firstFrame;
if (!frames.length) {
return;
}
baseMediaDecodeTimeTs = clock.audioTsToVideoTs(track.baseMediaDecodeTime, track.samplerate); // determine frame clock duration based on sample rate, round up to avoid overfills
frameDuration = Math.ceil(clock.ONE_SECOND_IN_TS / (track.samplerate / 1024));
if (audioAppendStartTs && videoBaseMediaDecodeTime) {
// insert the shortest possible amount (audio gap or audio to video gap)
audioGapDuration = baseMediaDecodeTimeTs - Math.max(audioAppendStartTs, videoBaseMediaDecodeTime); // number of full frames in the audio gap
audioFillFrameCount = Math.floor(audioGapDuration / frameDuration);
audioFillDuration = audioFillFrameCount * frameDuration;
} // don't attempt to fill gaps smaller than a single frame or larger
// than a half second
if (audioFillFrameCount < 1 || audioFillDuration > clock.ONE_SECOND_IN_TS / 2) {
return;
}
silentFrame = silence_1()[track.samplerate];
if (!silentFrame) {
// we don't have a silent frame pregenerated for the sample rate, so use a frame
// from the content instead
silentFrame = frames[0].data;
}
for (i = 0; i < audioFillFrameCount; i++) {
firstFrame = frames[0];
frames.splice(0, 0, {
data: silentFrame,
dts: firstFrame.dts - frameDuration,
pts: firstFrame.pts - frameDuration
});
}
track.baseMediaDecodeTime -= Math.floor(clock.videoTsToAudioTs(audioFillDuration, track.samplerate));
return audioFillDuration;
}; // If the audio segment extends before the earliest allowed dts
// value, remove AAC frames until starts at or after the earliest
// allowed DTS so that we don't end up with a negative baseMedia-
// DecodeTime for the audio track
var trimAdtsFramesByEarliestDts = function trimAdtsFramesByEarliestDts(adtsFrames, track, earliestAllowedDts) {
if (track.minSegmentDts >= earliestAllowedDts) {
return adtsFrames;
} // We will need to recalculate the earliest segment Dts
track.minSegmentDts = Infinity;
return adtsFrames.filter(function (currentFrame) {
// If this is an allowed frame, keep it and record it's Dts
if (currentFrame.dts >= earliestAllowedDts) {
track.minSegmentDts = Math.min(track.minSegmentDts, currentFrame.dts);
track.minSegmentPts = track.minSegmentDts;
return true;
} // Otherwise, discard it
return false;
});
}; // generate the track's raw mdat data from an array of frames
var generateSampleTable$1 = function generateSampleTable(frames) {
var i,
currentFrame,
samples = [];
for (i = 0; i < frames.length; i++) {
currentFrame = frames[i];
samples.push({
size: currentFrame.data.byteLength,
duration: 1024 // For AAC audio, all samples contain 1024 samples
});
}
return samples;
}; // generate the track's sample table from an array of frames
var concatenateFrameData = function concatenateFrameData(frames) {
var i,
currentFrame,
dataOffset = 0,
data = new Uint8Array(sumFrameByteLengths(frames));
for (i = 0; i < frames.length; i++) {
currentFrame = frames[i];
data.set(currentFrame.data, dataOffset);
dataOffset += currentFrame.data.byteLength;
}
return data;
};
var audioFrameUtils = {
prefixWithSilence: prefixWithSilence,
trimAdtsFramesByEarliestDts: trimAdtsFramesByEarliestDts,
generateSampleTable: generateSampleTable$1,
concatenateFrameData: concatenateFrameData
};
/**
* mux.js
*
* Copyright (c) Brightcove
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
*/
var ONE_SECOND_IN_TS$1 = clock.ONE_SECOND_IN_TS;
/**
* Store information about the start and end of the track and the
* duration for each frame/sample we process in order to calculate
* the baseMediaDecodeTime
*/
var collectDtsInfo = function collectDtsInfo(track, data) {
if (typeof data.pts === 'number') {
if (track.timelineStartInfo.pts === undefined) {
track.timelineStartInfo.pts = data.pts;
}
if (track.minSegmentPts === undefined) {
track.minSegmentPts = data.pts;
} else {
track.minSegmentPts = Math.min(track.minSegmentPts, data.pts);
}
if (track.maxSegmentPts === undefined) {
track.maxSegmentPts = data.pts;
} else {
track.maxSegmentPts = Math.max(track.maxSegmentPts, data.pts);
}
}
if (typeof data.dts === 'number') {
if (track.timelineStartInfo.dts === undefined) {
track.timelineStartInfo.dts = data.dts;
}
if (track.minSegmentDts === undefined) {
track.minSegmentDts = data.dts;
} else {
track.minSegmentDts = Math.min(track.minSegmentDts, data.dts);
}
if (track.maxSegmentDts === undefined) {
track.maxSegmentDts = data.dts;
} else {
track.maxSegmentDts = Math.max(track.maxSegmentDts, data.dts);
}
}
};
/**
* Clear values used to calculate the baseMediaDecodeTime between
* tracks
*/
var clearDtsInfo = function clearDtsInfo(track) {
delete track.minSegmentDts;
delete track.maxSegmentDts;
delete track.minSegmentPts;
delete track.maxSegmentPts;
};
/**
* Calculate the track's baseMediaDecodeTime based on the earliest
* DTS the transmuxer has ever seen and the minimum DTS for the
* current track
* @param track {object} track metadata configuration
* @param keepOriginalTimestamps {boolean} If true, keep the timestamps
* in the source; false to adjust the first segment to start at 0.
*/
var calculateTrackBaseMediaDecodeTime = function calculateTrackBaseMediaDecodeTime(track, keepOriginalTimestamps) {
var baseMediaDecodeTime,
scale,
minSegmentDts = track.minSegmentDts; // Optionally adjust the time so the first segment starts at zero.
if (!keepOriginalTimestamps) {
minSegmentDts -= track.timelineStartInfo.dts;
} // track.timelineStartInfo.baseMediaDecodeTime is the location, in time, where
// we want the start of the first segment to be placed
baseMediaDecodeTime = track.timelineStartInfo.baseMediaDecodeTime; // Add to that the distance this segment is from the very first
baseMediaDecodeTime += minSegmentDts; // baseMediaDecodeTime must not become negative
baseMediaDecodeTime = Math.max(0, baseMediaDecodeTime);
if (track.type === 'audio') {
// Audio has a different clock equal to the sampling_rate so we need to
// scale the PTS values into the clock rate of the track
scale = track.samplerate / ONE_SECOND_IN_TS$1;
baseMediaDecodeTime *= scale;
baseMediaDecodeTime = Math.floor(baseMediaDecodeTime);
}
return baseMediaDecodeTime;
};
var trackDecodeInfo = {
clearDtsInfo: clearDtsInfo,
calculateTrackBaseMediaDecodeTime: calculateTrackBaseMediaDecodeTime,
collectDtsInfo: collectDtsInfo
};
/**
* mux.js
*
* Copyright (c) Brightcove
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
*
* Reads in-band caption information from a video elementary
* stream. Captions must follow the CEA-708 standard for injection
* into an MPEG-2 transport streams.
* @see https://en.wikipedia.org/wiki/CEA-708
* @see https://www.gpo.gov/fdsys/pkg/CFR-2007-title47-vol1/pdf/CFR-2007-title47-vol1-sec15-119.pdf
*/
// payload type field to indicate how they are to be
// interpreted. CEAS-708 caption content is always transmitted with
// payload type 0x04.
var USER_DATA_REGISTERED_ITU_T_T35 = 4,
RBSP_TRAILING_BITS = 128;
/**
* Parse a supplemental enhancement information (SEI) NAL unit.