videojs-contrib-media-sources
Version:
A Media Source Extensions plugin for video.js
3,971 lines • 153 kB
JavaScript
/*! videojs-contrib-media-sources - v2.4.3 - 2016-01-05
* Copyright (c) 2016 Brightcove; Licensed */
/**
* mux.js
*
* Copyright (c) 2014 Brightcove
* All rights reserved.
*
* A lightweight readable stream implemention that handles event dispatching.
* Objects that inherit from streams should call init in their constructors.
*/
(function(window, muxjs, undefined) {
var Stream = function() {
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].push(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].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() {
destination.flush();
});
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() {
this.trigger('done');
};
window.muxjs = window.muxjs || {};
window.muxjs.utils = window.muxjs.utils || {};
window.muxjs.utils.Stream = Stream;
})(this, this.muxjs);
(function(window, muxjs) {
var ExpGolomb;
/**
* Parser for exponential Golomb codes, a variable-bitwidth number encoding
* scheme used by h264.
*/
ExpGolomb = function(workingData) {
var
// the number of bytes left to examine in workingData
workingBytesAvailable = workingData.byteLength,
// the current word being examined
workingWord = 0, // :uint
// the number of bits left to examine in the current word
workingBitsAvailable = 0; // :uint;
// ():uint
this.length = function() {
return (8 * workingBytesAvailable);
};
// ():uint
this.bitsAvailable = function() {
return (8 * workingBytesAvailable) + workingBitsAvailable;
};
// ():void
this.loadWord = function() {
var
position = workingData.byteLength - workingBytesAvailable,
workingBytes = new Uint8Array(4),
availableBytes = Math.min(4, workingBytesAvailable);
if (availableBytes === 0) {
throw new Error('no bytes available');
}
workingBytes.set(workingData.subarray(position,
position + availableBytes));
workingWord = new DataView(workingBytes.buffer).getUint32(0);
// track the amount of workingData that has been processed
workingBitsAvailable = availableBytes * 8;
workingBytesAvailable -= availableBytes;
};
// (count:int):void
this.skipBits = function(count) {
var skipBytes; // :int
if (workingBitsAvailable > count) {
workingWord <<= count;
workingBitsAvailable -= count;
} else {
count -= workingBitsAvailable;
skipBytes = Math.floor(count / 8);
count -= (skipBytes * 8);
workingBytesAvailable -= skipBytes;
this.loadWord();
workingWord <<= count;
workingBitsAvailable -= count;
}
};
// (size:int):uint
this.readBits = function(size) {
var
bits = Math.min(workingBitsAvailable, size), // :uint
valu = workingWord >>> (32 - bits); // :uint
console.assert(size < 32, 'Cannot read more than 32 bits at a time');
workingBitsAvailable -= bits;
if (workingBitsAvailable > 0) {
workingWord <<= bits;
} else if (workingBytesAvailable > 0) {
this.loadWord();
}
bits = size - bits;
if (bits > 0) {
return valu << bits | this.readBits(bits);
} else {
return valu;
}
};
// ():uint
this.skipLeadingZeros = function() {
var leadingZeroCount; // :uint
for (leadingZeroCount = 0 ; leadingZeroCount < workingBitsAvailable ; ++leadingZeroCount) {
if (0 !== (workingWord & (0x80000000 >>> leadingZeroCount))) {
// the first bit of working word is 1
workingWord <<= leadingZeroCount;
workingBitsAvailable -= leadingZeroCount;
return leadingZeroCount;
}
}
// we exhausted workingWord and still have not found a 1
this.loadWord();
return leadingZeroCount + this.skipLeadingZeros();
};
// ():void
this.skipUnsignedExpGolomb = function() {
this.skipBits(1 + this.skipLeadingZeros());
};
// ():void
this.skipExpGolomb = function() {
this.skipBits(1 + this.skipLeadingZeros());
};
// ():uint
this.readUnsignedExpGolomb = function() {
var clz = this.skipLeadingZeros(); // :uint
return this.readBits(clz + 1) - 1;
};
// ():int
this.readExpGolomb = function() {
var valu = this.readUnsignedExpGolomb(); // :int
if (0x01 & valu) {
// the number is odd if the low order bit is set
return (1 + valu) >>> 1; // add 1 to make it even, and divide by 2
} else {
return -1 * (valu >>> 1); // divide by two then make it negative
}
};
// Some convenience functions
// :Boolean
this.readBoolean = function() {
return 1 === this.readBits(1);
};
// ():int
this.readUnsignedByte = function() {
return this.readBits(8);
};
this.loadWord();
};
window.muxjs = muxjs || {};
muxjs.utils = muxjs.utils || {};
muxjs.utils.ExpGolomb = ExpGolomb;
})(this, this.muxjs);
(function(window, muxjs) {
'use strict';
var AacStream;
var
ADTS_SAMPLING_FREQUENCIES = [
96000,
88200,
64000,
48000,
44100,
32000,
24000,
22050,
16000,
12000,
11025,
8000,
7350
];
/*
* Accepts a ElementaryStream and emits data events with parsed
* AAC Audio Frames of the individual packets. Input audio in ADTS
* format is unpacked and re-emitted as AAC frames.
*
* @see http://wiki.multimedia.cx/index.php?title=ADTS
* @see http://wiki.multimedia.cx/?title=Understanding_AAC
*/
AacStream = function() {
var self, buffer;
AacStream.prototype.init.call(this);
self = this;
this.push = function(packet) {
var
i = 0,
frameNum = 0,
frameLength,
protectionSkipBytes,
frameEnd,
oldBuffer,
numFrames,
sampleCount,
aacFrameDuration;
if (packet.type !== 'audio') {
// ignore non-audio data
return;
}
// Prepend any data in the buffer to the input data so that we can parse
// aac frames the cross a PES packet boundary
if (buffer) {
oldBuffer = buffer;
buffer = new Uint8Array(oldBuffer.byteLength + packet.data.byteLength);
buffer.set(oldBuffer);
buffer.set(packet.data, oldBuffer.byteLength);
} else {
buffer = packet.data;
}
// unpack any ADTS frames which have been fully received
// for details on the ADTS header, see http://wiki.multimedia.cx/index.php?title=ADTS
while (i + 5 < buffer.length) {
// Loook for the start of an ADTS header..
if (buffer[i] !== 0xFF || (buffer[i + 1] & 0xF6) !== 0xF0) {
// If a valid header was not found, jump one forward and attempt to
// find a valid ADTS header starting at the next byte
i++;
continue;
}
// The protection skip bit tells us if we have 2 bytes of CRC data at the
// end of the ADTS header
protectionSkipBytes = (~buffer[i + 1] & 0x01) * 2;
// Frame length is a 13 bit integer starting 16 bits from the
// end of the sync sequence
frameLength = ((buffer[i + 3] & 0x03) << 11) |
(buffer[i + 4] << 3) |
((buffer[i + 5] & 0xe0) >> 5);
sampleCount = ((buffer[i + 6] & 0x03) + 1) * 1024;
aacFrameDuration = (sampleCount * 90000) /
ADTS_SAMPLING_FREQUENCIES[(buffer[i + 2] & 0x3c) >>> 2];
frameEnd = i + frameLength;
// If we don't have enough data to actually finish this AAC frame, return
// and wait for more data
if (buffer.byteLength < frameEnd) {
return;
}
// Otherwise, deliver the complete AAC frame
this.trigger('data', {
pts: packet.pts + (frameNum * aacFrameDuration),
dts: packet.dts + (frameNum * aacFrameDuration),
sampleCount: sampleCount,
audioobjecttype: ((buffer[i + 2] >>> 6) & 0x03) + 1,
channelcount: ((buffer[i + 2] & 1) << 3) |
((buffer[i + 3] & 0xc0) >>> 6),
samplerate: ADTS_SAMPLING_FREQUENCIES[(buffer[i + 2] & 0x3c) >>> 2],
samplingfrequencyindex: (buffer[i + 2] & 0x3c) >>> 2,
// assume ISO/IEC 14496-12 AudioSampleEntry default of 16
samplesize: 16,
data: buffer.subarray(i + 7 + protectionSkipBytes, frameEnd)
});
// If the buffer is empty, clear it and return
if (buffer.byteLength === frameEnd) {
buffer = undefined;
return;
}
frameNum++;
// Remove the finished frame from the buffer and start the process again
buffer = buffer.subarray(frameEnd);
}
};
};
AacStream.prototype = new muxjs.utils.Stream();
muxjs.codecs = muxjs.codecs || {};
muxjs.codecs.AacStream = AacStream;
})(this, this.muxjs);
(function(window, muxjs){
'use strict';
var H264Stream, NalByteStream;
/**
* Accepts a NAL unit byte stream and unpacks the embedded NAL units.
*/
NalByteStream = function() {
var
syncPoint = 0,
i,
buffer;
NalByteStream.prototype.init.call(this);
this.push = function(data) {
var swapBuffer;
if (!buffer) {
buffer = data.data;
} else {
swapBuffer = new Uint8Array(buffer.byteLength + data.data.byteLength);
swapBuffer.set(buffer);
swapBuffer.set(data.data, buffer.byteLength);
buffer = swapBuffer;
}
// Rec. ITU-T H.264, Annex B
// scan for NAL unit boundaries
// a match looks like this:
// 0 0 1 .. NAL .. 0 0 1
// ^ sync point ^ i
// or this:
// 0 0 1 .. NAL .. 0 0 0
// ^ sync point ^ i
// advance the sync point to a NAL start, if necessary
for (; syncPoint < buffer.byteLength - 3; syncPoint++) {
if (buffer[syncPoint + 2] === 1) {
// the sync point is properly aligned
i = syncPoint + 5;
break;
}
}
while (i < buffer.byteLength) {
// look at the current byte to determine if we've hit the end of
// a NAL unit boundary
switch (buffer[i]) {
case 0:
// skip past non-sync sequences
if (buffer[i - 1] !== 0) {
i += 2;
break;
} else if (buffer[i - 2] !== 0) {
i++;
break;
}
// deliver the NAL unit
this.trigger('data', buffer.subarray(syncPoint + 3, i - 2));
// drop trailing zeroes
do {
i++;
} while (buffer[i] !== 1 && i < buffer.length);
syncPoint = i - 2;
i += 3;
break;
case 1:
// skip past non-sync sequences
if (buffer[i - 1] !== 0 ||
buffer[i - 2] !== 0) {
i += 3;
break;
}
// deliver the NAL unit
this.trigger('data', buffer.subarray(syncPoint + 3, i - 2));
syncPoint = i - 2;
i += 3;
break;
default:
// the current byte isn't a one or zero, so it cannot be part
// of a sync sequence
i += 3;
break;
}
}
// filter out the NAL units that were delivered
buffer = buffer.subarray(syncPoint);
i -= syncPoint;
syncPoint = 0;
};
this.flush = function() {
// deliver the last buffered NAL unit
if (buffer && buffer.byteLength > 3) {
this.trigger('data', buffer.subarray(syncPoint + 3));
}
// reset the stream state
buffer = null;
syncPoint = 0;
this.trigger('done');
};
};
NalByteStream.prototype = new muxjs.utils.Stream();
/**
* Accepts input from a ElementaryStream and produces H.264 NAL unit data
* events.
*/
H264Stream = function() {
var
nalByteStream = new NalByteStream(),
self,
trackId,
currentPts,
currentDts,
discardEmulationPreventionBytes,
readSequenceParameterSet,
skipScalingList;
H264Stream.prototype.init.call(this);
self = this;
this.push = function(packet) {
if (packet.type !== 'video') {
return;
}
trackId = packet.trackId;
currentPts = packet.pts;
currentDts = packet.dts;
nalByteStream.push(packet);
};
nalByteStream.on('data', function(data) {
var
event = {
trackId: trackId,
pts: currentPts,
dts: currentDts,
data: data
};
switch (data[0] & 0x1f) {
case 0x05:
event.nalUnitType = 'slice_layer_without_partitioning_rbsp_idr';
break;
case 0x06:
event.nalUnitType = 'sei_rbsp';
event.escapedRBSP = discardEmulationPreventionBytes(data.subarray(1));
break;
case 0x07:
event.nalUnitType = 'seq_parameter_set_rbsp';
event.escapedRBSP = discardEmulationPreventionBytes(data.subarray(1));
event.config = readSequenceParameterSet(event.escapedRBSP);
break;
case 0x08:
event.nalUnitType = 'pic_parameter_set_rbsp';
break;
case 0x09:
event.nalUnitType = 'access_unit_delimiter_rbsp';
break;
default:
break;
}
self.trigger('data', event);
});
nalByteStream.on('done', function() {
self.trigger('done');
});
this.flush = function() {
nalByteStream.flush();
};
/**
* Advance the ExpGolomb decoder past a scaling list. The scaling
* list is optionally transmitted as part of a sequence parameter
* set and is not relevant to transmuxing.
* @param count {number} the number of entries in this scaling list
* @param expGolombDecoder {object} an ExpGolomb pointed to the
* start of a scaling list
* @see Recommendation ITU-T H.264, Section 7.3.2.1.1.1
*/
skipScalingList = function(count, expGolombDecoder) {
var
lastScale = 8,
nextScale = 8,
j,
deltaScale;
for (j = 0; j < count; j++) {
if (nextScale !== 0) {
deltaScale = expGolombDecoder.readExpGolomb();
nextScale = (lastScale + deltaScale + 256) % 256;
}
lastScale = (nextScale === 0) ? lastScale : nextScale;
}
};
/**
* Expunge any "Emulation Prevention" bytes from a "Raw Byte
* Sequence Payload"
* @param data {Uint8Array} the bytes of a RBSP from a NAL
* unit
* @return {Uint8Array} the RBSP without any Emulation
* Prevention Bytes
*/
discardEmulationPreventionBytes = function(data) {
var
length = data.byteLength,
emulationPreventionBytesPositions = [],
i = 1,
newLength, newData;
// Find all `Emulation Prevention Bytes`
while (i < length - 2) {
if (data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 0x03) {
emulationPreventionBytesPositions.push(i + 2);
i += 2;
} else {
i++;
}
}
// If no Emulation Prevention Bytes were found just return the original
// array
if (emulationPreventionBytesPositions.length === 0) {
return data;
}
// Create a new array to hold the NAL unit data
newLength = length - emulationPreventionBytesPositions.length;
newData = new Uint8Array(newLength);
var sourceIndex = 0;
for (i = 0; i < newLength; sourceIndex++, i++) {
if (sourceIndex === emulationPreventionBytesPositions[0]) {
// Skip this byte
sourceIndex++;
// Remove this position index
emulationPreventionBytesPositions.shift();
}
newData[i] = data[sourceIndex];
}
return newData;
};
/**
* Read a sequence parameter set and return some interesting video
* properties. A sequence parameter set is the H264 metadata that
* describes the properties of upcoming video frames.
* @param data {Uint8Array} the bytes of a sequence parameter set
* @return {object} an object with configuration parsed from the
* sequence parameter set, including the dimensions of the
* associated video frames.
*/
readSequenceParameterSet = function(data) {
var
frameCropLeftOffset = 0,
frameCropRightOffset = 0,
frameCropTopOffset = 0,
frameCropBottomOffset = 0,
expGolombDecoder, profileIdc, levelIdc, profileCompatibility,
chromaFormatIdc, picOrderCntType,
numRefFramesInPicOrderCntCycle, picWidthInMbsMinus1,
picHeightInMapUnitsMinus1,
frameMbsOnlyFlag,
scalingListCount,
i;
expGolombDecoder = new muxjs.utils.ExpGolomb(data);
profileIdc = expGolombDecoder.readUnsignedByte(); // profile_idc
profileCompatibility = expGolombDecoder.readUnsignedByte(); // constraint_set[0-5]_flag
levelIdc = expGolombDecoder.readUnsignedByte(); // level_idc u(8)
expGolombDecoder.skipUnsignedExpGolomb(); // seq_parameter_set_id
// some profiles have more optional data we don't need
if (profileIdc === 100 ||
profileIdc === 110 ||
profileIdc === 122 ||
profileIdc === 244 ||
profileIdc === 44 ||
profileIdc === 83 ||
profileIdc === 86 ||
profileIdc === 118 ||
profileIdc === 128 ||
profileIdc === 138 ||
profileIdc === 139 ||
profileIdc === 134) {
chromaFormatIdc = expGolombDecoder.readUnsignedExpGolomb();
if (chromaFormatIdc === 3) {
expGolombDecoder.skipBits(1); // separate_colour_plane_flag
}
expGolombDecoder.skipUnsignedExpGolomb(); // bit_depth_luma_minus8
expGolombDecoder.skipUnsignedExpGolomb(); // bit_depth_chroma_minus8
expGolombDecoder.skipBits(1); // qpprime_y_zero_transform_bypass_flag
if (expGolombDecoder.readBoolean()) { // seq_scaling_matrix_present_flag
scalingListCount = (chromaFormatIdc !== 3) ? 8 : 12;
for (i = 0; i < scalingListCount; i++) {
if (expGolombDecoder.readBoolean()) { // seq_scaling_list_present_flag[ i ]
if (i < 6) {
skipScalingList(16, expGolombDecoder);
} else {
skipScalingList(64, expGolombDecoder);
}
}
}
}
}
expGolombDecoder.skipUnsignedExpGolomb(); // log2_max_frame_num_minus4
picOrderCntType = expGolombDecoder.readUnsignedExpGolomb();
if (picOrderCntType === 0) {
expGolombDecoder.readUnsignedExpGolomb(); //log2_max_pic_order_cnt_lsb_minus4
} else if (picOrderCntType === 1) {
expGolombDecoder.skipBits(1); // delta_pic_order_always_zero_flag
expGolombDecoder.skipExpGolomb(); // offset_for_non_ref_pic
expGolombDecoder.skipExpGolomb(); // offset_for_top_to_bottom_field
numRefFramesInPicOrderCntCycle = expGolombDecoder.readUnsignedExpGolomb();
for(i = 0; i < numRefFramesInPicOrderCntCycle; i++) {
expGolombDecoder.skipExpGolomb(); // offset_for_ref_frame[ i ]
}
}
expGolombDecoder.skipUnsignedExpGolomb(); // max_num_ref_frames
expGolombDecoder.skipBits(1); // gaps_in_frame_num_value_allowed_flag
picWidthInMbsMinus1 = expGolombDecoder.readUnsignedExpGolomb();
picHeightInMapUnitsMinus1 = expGolombDecoder.readUnsignedExpGolomb();
frameMbsOnlyFlag = expGolombDecoder.readBits(1);
if (frameMbsOnlyFlag === 0) {
expGolombDecoder.skipBits(1); // mb_adaptive_frame_field_flag
}
expGolombDecoder.skipBits(1); // direct_8x8_inference_flag
if (expGolombDecoder.readBoolean()) { // frame_cropping_flag
frameCropLeftOffset = expGolombDecoder.readUnsignedExpGolomb();
frameCropRightOffset = expGolombDecoder.readUnsignedExpGolomb();
frameCropTopOffset = expGolombDecoder.readUnsignedExpGolomb();
frameCropBottomOffset = expGolombDecoder.readUnsignedExpGolomb();
}
return {
profileIdc: profileIdc,
levelIdc: levelIdc,
profileCompatibility: profileCompatibility,
width: ((picWidthInMbsMinus1 + 1) * 16) - frameCropLeftOffset * 2 - frameCropRightOffset * 2,
height: ((2 - frameMbsOnlyFlag) * (picHeightInMapUnitsMinus1 + 1) * 16) - (frameCropTopOffset * 2) - (frameCropBottomOffset * 2)
};
};
};
H264Stream.prototype = new muxjs.utils.Stream();
muxjs.codecs = muxjs.codecs || {};
muxjs.codecs.H264Stream = H264Stream;
muxjs.codecs.NalByteStream = NalByteStream;
})(this, this.muxjs);
/**
* mux.js
*
* Copyright (c) 2015 Brightcove
* All rights reserved.
*
* A stream-based mp2t to mp4 converter. This utility can be used to
* deliver mp4s to a SourceBuffer on platforms that support native
* Media Source Extensions.
*/
(function(window, muxjs, undefined) {
'use strict';
// object types
var
TransportPacketStream, TransportParseStream, ElementaryStream,
AacStream, H264Stream, NalByteStream;
// constants
var
MP2T_PACKET_LENGTH, H264_STREAM_TYPE, ADTS_STREAM_TYPE,
METADATA_STREAM_TYPE, ADTS_SAMPLING_FREQUENCIES, SYNC_BYTE;
MP2T_PACKET_LENGTH = 188; // bytes
SYNC_BYTE = 0x47;
H264_STREAM_TYPE = 0x1b;
ADTS_STREAM_TYPE = 0x0f;
METADATA_STREAM_TYPE = 0x15;
/**
* Splits an incoming stream of binary data into MPEG-2 Transport
* Stream packets.
*/
TransportPacketStream = function() {
var
buffer = new Uint8Array(MP2T_PACKET_LENGTH),
bytesInBuffer = 0;
TransportPacketStream.prototype.init.call(this);
// Deliver new bytes to the stream.
this.push = function(bytes) {
var
i = 0,
startIndex = 0,
endIndex = MP2T_PACKET_LENGTH,
everything;
// If there are bytes remaining from the last segment, prepend them to the
// bytes that were pushed in
if (bytesInBuffer) {
everything = new Uint8Array(bytes.byteLength + bytesInBuffer);
everything.set(buffer.subarray(0, bytesInBuffer));
everything.set(bytes, bytesInBuffer);
bytesInBuffer = 0;
} else {
everything = bytes;
}
// While we have enough data for a packet
while (endIndex < everything.byteLength) {
// Look for a pair of start and end sync bytes in the data..
if (everything[startIndex] === SYNC_BYTE && everything[endIndex] === SYNC_BYTE) {
// We found a packet so emit it and jump one whole packet forward in
// the stream
this.trigger('data', everything.subarray(startIndex, endIndex));
startIndex += MP2T_PACKET_LENGTH;
endIndex += MP2T_PACKET_LENGTH;
continue;
}
// If we get here, we have somehow become de-synchronized and we need to step
// forward one byte at a time until we find a pair of sync bytes that denote
// a packet
startIndex++;
endIndex++;
}
// If there was some data left over at the end of the segment that couldn't
// possibly be a whole packet, keep it because it might be the start of a packet
// that continues in the next segment
if (startIndex < everything.byteLength) {
buffer.set(everything.subarray(startIndex), 0);
bytesInBuffer = everything.byteLength - startIndex;
}
};
this.flush = function () {
// If the buffer contains a whole packet when we are being flushed, emit it
// and empty the buffer. Otherwise hold onto the data because it may be
// important for decoding the next segment
if (bytesInBuffer === MP2T_PACKET_LENGTH && buffer[0] === SYNC_BYTE) {
this.trigger('data', buffer);
bytesInBuffer = 0;
}
this.trigger('done');
};
};
TransportPacketStream.prototype = new muxjs.utils.Stream();
/**
* Accepts an MP2T TransportPacketStream and emits data events with parsed
* forms of the individual transport stream packets.
*/
TransportParseStream = function() {
var parsePsi, parsePat, parsePmt, parsePes, self;
TransportParseStream.prototype.init.call(this);
self = this;
this.packetsWaitingForPmt = [];
this.programMapTable = undefined;
parsePsi = function(payload, psi) {
var offset = 0;
// PSI packets may be split into multiple sections and those
// sections may be split into multiple packets. If a PSI
// section starts in this packet, the payload_unit_start_indicator
// will be true and the first byte of the payload will indicate
// the offset from the current position to the start of the
// section.
if (psi.payloadUnitStartIndicator) {
offset += payload[offset] + 1;
}
if (psi.type === 'pat') {
parsePat(payload.subarray(offset), psi);
} else {
parsePmt(payload.subarray(offset), psi);
}
};
parsePat = function(payload, pat) {
pat.section_number = payload[7];
pat.last_section_number = payload[8];
// skip the PSI header and parse the first PMT entry
self.pmtPid = (payload[10] & 0x1F) << 8 | payload[11];
pat.pmtPid = self.pmtPid;
};
/**
* Parse out the relevant fields of a Program Map Table (PMT).
* @param payload {Uint8Array} the PMT-specific portion of an MP2T
* packet. The first byte in this array should be the table_id
* field.
* @param pmt {object} the object that should be decorated with
* fields parsed from the PMT.
*/
parsePmt = function(payload, pmt) {
var sectionLength, tableEnd, programInfoLength, offset;
// PMTs can be sent ahead of the time when they should actually
// take effect. We don't believe this should ever be the case
// for HLS but we'll ignore "forward" PMT declarations if we see
// them. Future PMT declarations have the current_next_indicator
// set to zero.
if (!(payload[5] & 0x01)) {
return;
}
// overwrite any existing program map table
self.programMapTable = {};
// the mapping table ends at the end of the current section
sectionLength = (payload[1] & 0x0f) << 8 | payload[2];
tableEnd = 3 + sectionLength - 4;
// to determine where the table is, we have to figure out how
// long the program info descriptors are
programInfoLength = (payload[10] & 0x0f) << 8 | payload[11];
// advance the offset to the first entry in the mapping table
offset = 12 + programInfoLength;
while (offset < tableEnd) {
// add an entry that maps the elementary_pid to the stream_type
self.programMapTable[(payload[offset + 1] & 0x1F) << 8 | payload[offset + 2]] = payload[offset];
// move to the next table entry
// skip past the elementary stream descriptors, if present
offset += ((payload[offset + 3] & 0x0F) << 8 | payload[offset + 4]) + 5;
}
// record the map on the packet as well
pmt.programMapTable = self.programMapTable;
// if there are any packets waiting for a PMT to be found, process them now
while (self.packetsWaitingForPmt.length) {
self.processPes_.apply(self, self.packetsWaitingForPmt.shift());
}
};
/**
* Deliver a new MP2T packet to the stream.
*/
this.push = function(packet) {
var
result = {},
offset = 4;
result.payloadUnitStartIndicator = !!(packet[1] & 0x40);
// pid is a 13-bit field starting at the last bit of packet[1]
result.pid = packet[1] & 0x1f;
result.pid <<= 8;
result.pid |= packet[2];
// if an adaption field is present, its length is specified by the
// fifth byte of the TS packet header. The adaptation field is
// used to add stuffing to PES packets that don't fill a complete
// TS packet, and to specify some forms of timing and control data
// that we do not currently use.
if (((packet[3] & 0x30) >>> 4) > 0x01) {
offset += packet[offset] + 1;
}
// parse the rest of the packet based on the type
if (result.pid === 0) {
result.type = 'pat';
parsePsi(packet.subarray(offset), result);
this.trigger('data', result);
} else if (result.pid === this.pmtPid) {
result.type = 'pmt';
parsePsi(packet.subarray(offset), result);
this.trigger('data', result);
} else if (this.programMapTable === undefined) {
this.packetsWaitingForPmt.push([packet, offset, result]);
} else {
this.processPes_(packet, offset, result);
}
};
this.processPes_ = function (packet, offset, result) {
result.streamType = this.programMapTable[result.pid];
result.type = 'pes';
result.data = packet.subarray(offset);
this.trigger('data', result);
};
};
TransportParseStream.prototype = new muxjs.utils.Stream();
TransportParseStream.STREAM_TYPES = {
h264: 0x1b,
adts: 0x0f
};
/**
* Reconsistutes program elementary stream (PES) packets from parsed
* transport stream packets. That is, if you pipe an
* mp2t.TransportParseStream into a mp2t.ElementaryStream, the output
* events will be events which capture the bytes for individual PES
* packets plus relevant metadata that has been extracted from the
* container.
*/
ElementaryStream = function() {
var
// PES packet fragments
video = {
data: [],
size: 0
},
audio = {
data: [],
size: 0
},
timedMetadata = {
data: [],
size: 0
},
parsePes = function(payload, pes) {
var ptsDtsFlags;
// find out if this packets starts a new keyframe
pes.dataAlignmentIndicator = (payload[6] & 0x04) !== 0;
// PES packets may be annotated with a PTS value, or a PTS value
// and a DTS value. Determine what combination of values is
// available to work with.
ptsDtsFlags = payload[7];
// PTS and DTS are normally stored as a 33-bit number. Javascript
// performs all bitwise operations on 32-bit integers but javascript
// supports a much greater range (52-bits) of integer using standard
// mathematical operations.
// We construct a 31-bit value using bitwise operators over the 31
// most significant bits and then multiply by 4 (equal to a left-shift
// of 2) before we add the final 2 least significant bits of the
// timestamp (equal to an OR.)
if (ptsDtsFlags & 0xC0) {
// the PTS and DTS are not written out directly. For information
// on how they are encoded, see
// http://dvd.sourceforge.net/dvdinfo/pes-hdr.html
pes.pts = (payload[9] & 0x0E) << 27
| (payload[10] & 0xFF) << 20
| (payload[11] & 0xFE) << 12
| (payload[12] & 0xFF) << 5
| (payload[13] & 0xFE) >>> 3;
pes.pts *= 4; // Left shift by 2
pes.pts += (payload[13] & 0x06) >>> 1; // OR by the two LSBs
pes.dts = pes.pts;
if (ptsDtsFlags & 0x40) {
pes.dts = (payload[14] & 0x0E ) << 27
| (payload[15] & 0xFF ) << 20
| (payload[16] & 0xFE ) << 12
| (payload[17] & 0xFF ) << 5
| (payload[18] & 0xFE ) >>> 3;
pes.dts *= 4; // Left shift by 2
pes.dts += (payload[18] & 0x06) >>> 1; // OR by the two LSBs
}
}
// the data section starts immediately after the PES header.
// pes_header_data_length specifies the number of header bytes
// that follow the last byte of the field.
pes.data = payload.subarray(9 + payload[8]);
},
flushStream = function(stream, type) {
var
packetData = new Uint8Array(stream.size),
event = {
type: type
},
i = 0,
fragment;
// do nothing if there is no buffered data
if (!stream.data.length) {
return;
}
event.trackId = stream.data[0].pid;
// reassemble the packet
while (stream.data.length) {
fragment = stream.data.shift();
packetData.set(fragment.data, i);
i += fragment.data.byteLength;
}
// parse assembled packet's PES header
parsePes(packetData, event);
stream.size = 0;
self.trigger('data', event);
},
self;
ElementaryStream.prototype.init.call(this);
self = this;
this.push = function(data) {
({
pat: function() {
// we have to wait for the PMT to arrive as well before we
// have any meaningful metadata
},
pes: function() {
var stream, streamType;
switch (data.streamType) {
case H264_STREAM_TYPE:
stream = video;
streamType = 'video';
break;
case ADTS_STREAM_TYPE:
stream = audio;
streamType = 'audio';
break;
case METADATA_STREAM_TYPE:
stream = timedMetadata;
streamType = 'timed-metadata';
break;
default:
// ignore unknown stream types
return;
}
// if a new packet is starting, we can flush the completed
// packet
if (data.payloadUnitStartIndicator) {
flushStream(stream, streamType);
}
// buffer this fragment until we are sure we've received the
// complete payload
stream.data.push(data);
stream.size += data.data.byteLength;
},
pmt: function() {
var
event = {
type: 'metadata',
tracks: []
},
programMapTable = data.programMapTable,
k,
track;
// translate streams to tracks
for (k in programMapTable) {
if (programMapTable.hasOwnProperty(k)) {
track = {
timelineStartInfo: {
baseMediaDecodeTime: 0
}
};
track.id = +k;
if (programMapTable[k] === H264_STREAM_TYPE) {
track.codec = 'avc';
track.type = 'video';
} else if (programMapTable[k] === ADTS_STREAM_TYPE) {
track.codec = 'adts';
track.type = 'audio';
}
event.tracks.push(track);
}
}
self.trigger('data', event);
}
})[data.type]();
};
/**
* Flush any remaining input. Video PES packets may be of variable
* length. Normally, the start of a new video packet can trigger the
* finalization of the previous packet. That is not possible if no
* more video is forthcoming, however. In that case, some other
* mechanism (like the end of the file) has to be employed. When it is
* clear that no additional data is forthcoming, calling this method
* will flush the buffered packets.
*/
this.flush = function() {
// !!THIS ORDER IS IMPORTANT!!
// video first then audio
flushStream(video, 'video');
flushStream(audio, 'audio');
flushStream(timedMetadata, 'timed-metadata');
this.trigger('done');
};
};
ElementaryStream.prototype = new muxjs.utils.Stream();
// exports
muxjs.mp2t = muxjs.mp2t || {};
muxjs.mp2t.PAT_PID = 0x0000;
muxjs.mp2t.MP2T_PACKET_LENGTH = MP2T_PACKET_LENGTH;
muxjs.mp2t.H264_STREAM_TYPE = H264_STREAM_TYPE;
muxjs.mp2t.ADTS_STREAM_TYPE = ADTS_STREAM_TYPE;
muxjs.mp2t.METADATA_STREAM_TYPE = METADATA_STREAM_TYPE;
muxjs.mp2t.TransportPacketStream = TransportPacketStream;
muxjs.mp2t.TransportParseStream = TransportParseStream;
muxjs.mp2t.ElementaryStream = ElementaryStream;
})(this, this.muxjs);
/**
* An object that stores the bytes of an FLV tag and methods for
* querying and manipulating that data.
* @see http://download.macromedia.com/f4v/video_file_format_spec_v10_1.pdf
*/
(function(window, muxjs) {
'use strict';
var FlvTag;
// (type:uint, extraData:Boolean = false) extends ByteArray
FlvTag = function(type, extraData) {
var
// Counter if this is a metadata tag, nal start marker if this is a video
// tag. unused if this is an audio tag
adHoc = 0, // :uint
// The default size is 16kb but this is not enough to hold iframe
// data and the resizing algorithm costs a bit so we create a larger
// starting buffer for video tags
bufferStartSize = 16384,
// checks whether the FLV tag has enough capacity to accept the proposed
// write and re-allocates the internal buffers if necessary
prepareWrite = function(flv, count) {
var
bytes,
minLength = flv.position + count;
if (minLength < flv.bytes.byteLength) {
// there's enough capacity so do nothing
return;
}
// allocate a new buffer and copy over the data that will not be modified
bytes = new Uint8Array(minLength * 2);
bytes.set(flv.bytes.subarray(0, flv.position), 0);
flv.bytes = bytes;
flv.view = new DataView(flv.bytes.buffer);
},
// commonly used metadata properties
widthBytes = FlvTag.widthBytes || new Uint8Array('width'.length),
heightBytes = FlvTag.heightBytes || new Uint8Array('height'.length),
videocodecidBytes = FlvTag.videocodecidBytes || new Uint8Array('videocodecid'.length),
i;
if (!FlvTag.widthBytes) {
// calculating the bytes of common metadata names ahead of time makes the
// corresponding writes faster because we don't have to loop over the
// characters
// re-test with test/perf.html if you're planning on changing this
for (i = 0; i < 'width'.length; i++) {
widthBytes[i] = 'width'.charCodeAt(i);
}
for (i = 0; i < 'height'.length; i++) {
heightBytes[i] = 'height'.charCodeAt(i);
}
for (i = 0; i < 'videocodecid'.length; i++) {
videocodecidBytes[i] = 'videocodecid'.charCodeAt(i);
}
FlvTag.widthBytes = widthBytes;
FlvTag.heightBytes = heightBytes;
FlvTag.videocodecidBytes = videocodecidBytes;
}
this.keyFrame = false; // :Boolean
switch(type) {
case FlvTag.VIDEO_TAG:
this.length = 16;
// Start the buffer at 256k
bufferStartSize *= 6;
break;
case FlvTag.AUDIO_TAG:
this.length = 13;
this.keyFrame = true;
break;
case FlvTag.METADATA_TAG:
this.length = 29;
this.keyFrame = true;
break;
default:
throw("Error Unknown TagType");
}
this.bytes = new Uint8Array(bufferStartSize);
this.view = new DataView(this.bytes.buffer);
this.bytes[0] = type;
this.position = this.length;
this.keyFrame = extraData; // Defaults to false
// presentation timestamp
this.pts = 0;
// decoder timestamp
this.dts = 0;
// ByteArray#writeBytes(bytes:ByteArray, offset:uint = 0, length:uint = 0)
this.writeBytes = function(bytes, offset, length) {
var
start = offset || 0,
end;
length = length || bytes.byteLength;
end = start + length;
prepareWrite(this, length);
this.bytes.set(bytes.subarray(start, end), this.position);
this.position += length;
this.length = Math.max(this.length, this.position);
};
// ByteArray#writeByte(value:int):void
this.writeByte = function(byte) {
prepareWrite(this, 1);
this.bytes[this.position] = byte;
this.position++;
this.length = Math.max(this.length, this.position);
};
// ByteArray#writeShort(value:int):void
this.writeShort = function(short) {
prepareWrite(this, 2);
this.view.setUint16(this.position, short);
this.position += 2;
this.length = Math.max(this.length, this.position);
};
// Negative index into array
// (pos:uint):int
this.negIndex = function(pos) {
return this.bytes[this.length - pos];
};
// The functions below ONLY work when this[0] == VIDEO_TAG.
// We are not going to check for that because we dont want the overhead
// (nal:ByteArray = null):int
this.nalUnitSize = function() {
if (adHoc === 0) {
return 0;
}
return this.length - (adHoc + 4);
};
this.startNalUnit = function() {
// remember position and add 4 bytes
if (adHoc > 0) {
throw new Error("Attempted to create new NAL wihout closing the old one");
}
// reserve 4 bytes for nal unit size
adHoc = this.length;
this.length += 4;
this.position = this.length;
};
// (nal:ByteArray = null):void
this.endNalUnit = function(nalContainer) {
var
nalStart, // :uint
nalLength; // :uint
// Rewind to the marker and write the size
if (this.length === adHoc + 4) {
// we started a nal unit, but didnt write one, so roll back the 4 byte size value
this.length -= 4;
} else if (adHoc > 0) {
nalStart = adHoc + 4;
nalLength = this.length - nalStart;
this.position = adHoc;
this.view.setUint32(this.position, nalLength);
this.position = this.length;
if (nalContainer) {
// Add the tag to the NAL unit
nalContainer.push(this.bytes.subarray(nalStart, nalStart + nalLength));
}
}
adHoc = 0;
};
/**
* Write out a 64-bit floating point valued metadata property. This method is
* called frequently during a typical parse and needs to be fast.
*/
// (key:String, val:Number):void
this.writeMetaDataDouble = function(key, val) {
var i;
prepareWrite(this, 2 + key.length + 9);
// write size of property name
this.view.setUint16(this.position, key.length);
this.position += 2;
// this next part looks terrible but it improves parser throughput by
// 10kB/s in my testing
// write property name
if (key === 'width') {
this.bytes.set(widthBytes, this.position);
this.position += 5;
} else if (key === 'height') {
this.bytes.set(heightBytes, this.position);
this.position += 6;
} else if (key === 'videocodecid') {
this.bytes.set(videocodecidBytes, this.position);
this.position += 12;
} else {
for (i = 0; i < key.length; i++) {
this.bytes[this.position] = key.charCodeAt(i);
this.position++;
}
}
// skip null byte
this.position++;
// write property value
this.view.setFloat64(this.position, val);
this.position += 8;
// update flv tag length
this.length = Math.max(this.length, this.position);
++adHoc;
};
// (key:String, val:Boolean):void
this.writeMetaDataBoolean = function(key, val) {
var i;
prepareWrite(this, 2);
this.view.setUint16(this.position, key.length);
this.position += 2;
for (i = 0; i < key.length; i++) {
console.assert(key.charCodeAt(i) < 255);
prepareWrite(this, 1);
this.bytes[this.position] = key.charCodeAt(i);
this.position++;
}
prepareWrite(this, 2);
this.view.setUint8(this.position, 0x01);
this.position++;
this.view.setUint8(this.position, val ? 0x01 : 0x00);
this.position++;
this.length = Math.max(this.length, this.position);
++adHoc;
};
// ():ByteArray
this.finalize = function() {
var
dtsDelta, // :int
len; // :int
switch(this.bytes[0]) {
// Video Data
case FlvTag.VIDEO_TAG:
this.bytes[11] = ((this.keyFrame || extraData) ? 0x10 : 0x20 ) | 0x07; // We only support AVC, 1 = key frame (for AVC, a seekable frame), 2 = inter frame (for AVC, a non-seekable frame)
this.bytes[12] = extraData ? 0x00 : 0x01;
dtsDelta = this.pts - this.dts;
this.bytes[13] = (dtsDelta & 0x00FF0000) >>> 16;
this.bytes[14] = (dtsDelta & 0x0000FF00) >>> 8;
this.bytes[15] = (dtsDelta & 0x000000FF) >>> 0;
break;
case FlvTag.AUDIO_TAG:
this.bytes[11] = 0xAF; // 44 kHz, 16-bit stereo
this.bytes[12] = extraData ? 0x00 : 0x01;
break;
case FlvTag.METADATA_TAG:
this.position = 11;
this.view.setUint8(this.position, 0x02); // String type
this.position++;
this.view.setUint16(this.position, 0x0A); // 10 Bytes
this.position += 2;
// set "onMetaData"
this.bytes.set([0x6f, 0x6e, 0x4d, 0x65,
0x74, 0x61, 0x44, 0x61,
0x74, 0x61], this.position);
this.position += 10;
this.bytes[this.position] = 0x08; // Array type
this.position++;
this.view.setUint32(this.position, adHoc);
this.position = this.length;
this.bytes.set([0, 0, 9], this.position);
this.position += 3; // End Data Tag
this.length = this.position;
break;
}
len = this.length - 11;
// write the DataSize field
this.bytes[ 1] = (len & 0x00FF0000) >>> 16;
this.bytes[ 2] = (len & 0x0000FF00) >>> 8;
this.bytes[ 3] = (len & 0x000000FF) >>> 0;
// write the Timestamp
this.bytes[ 4] = (this.dts & 0x00FF0000) >>> 16;
this.bytes[ 5] = (this.dts & 0x0000FF00) >>> 8;
this.bytes[ 6] = (this.dts & 0x000000FF) >>> 0;
this.bytes[ 7] = (this.dts & 0xFF000000) >>> 24;
// write the StreamID
this.bytes[ 8] = 0;
this.bytes[ 9] = 0;
this.bytes[10] = 0;
// Sometimes we're at the end of the view and have one slot to write a
// uint32, so, prepareWrite of count 4, since, view is uint8
prepareWrite(this, 4);
this.view.setUint32(this.length, this.length);
this.length += 4;
this.position += 4;
// trim down the byte buffer to what is actually being used
this.bytes = this.bytes.subarray(0, this.length);
this.frameTime = FlvTag.frameTime(this.bytes);
console.assert(this.bytes.byteLength === this.length);
return this;
};
};
FlvTag.AUDIO_TAG = 0x08; // == 8, :uint
FlvTag.VIDEO_TAG = 0x09; // == 9, :uint
FlvTag.METADATA_TAG = 0x12; // == 18, :uint
// (tag:ByteArray):Boolean {
FlvTag.isAudioFrame = function(tag) {
return FlvTag.AUDIO_TAG === tag[0];
};
// (tag:ByteArray):Boolean {
FlvTag.isVideoFrame = function(tag) {
return FlvTag.VIDEO_TAG === tag[0];
};
// (tag:ByteArray):Boolean {
FlvTag.isMetaData = function(tag) {
return FlvTag.METADATA_TAG === tag[0];
};
// (tag:ByteArray):Boolean {
FlvTag.isKeyFrame = function(tag) {
if (FlvTag.isVideoFrame(tag)) {
return tag[11] === 0x17;
}
if (FlvTag.isAudioFrame(tag)) {
return true;
}
if (FlvTag.isMetaData(tag)) {
return true;
}
return false;
};
// (tag:ByteArray):uint {
FlvTag.frameTime = function(tag) {
var pts = tag[ 4] << 16; // :uint
pts |= tag[ 5] << 8;
pts |= tag[ 6] << 0;
pts |= tag[ 7] << 24;
return pts;
};
muxjs.flv = muxjs.flv || {};
muxjs.flv.FlvTag = FlvTag;
})(this, this.muxjs);
/**
* Accepts program elementary stream (PES) data events and parses out
* ID3 metadata from them, if present.
* @see http://id3.org/id3v2.3.0
*/
(function(window, muxjs, undefined) {
'use strict';
var
// return a percent-encoded representation of the specified byte range
// @see http://en.wikipedia.org/wiki/Percent-encoding
percentEncode = function(bytes, start, end) {
var i, result = '';
for (i = start; i < end; i++) {
result += '%' + ('00' + bytes[i].toString(16)).slice(-2);
}
return result;
},
// return the string representation of the specified byte range,
// interpreted as UTf-8.
parseUtf8 = function(bytes, start, end) {
return window.decodeURIComponent(percentEncode(bytes, start, end));
},
// return the string representation of the specified byte range,
// interpreted as ISO-8859-1.
parseIso88591 = function(bytes, start, end) {
return window.unescape(percentEncode(bytes, start, end));
},
parseSyncSafeInteger = function (data) {
return (data[0] << 21) |
(data[1] << 14) |
(data[2] << 7) |
(data[3]);
},
tagParsers = {
'TXXX': function(tag) {
var i;
if (tag.data[0] !== 3) {
// ignore frames with unrecognized character encodings
return;
}
for (i = 1; i < tag.data.length; i++) {
if (tag.data[i] === 0) {
// parse the text fields
tag.description = parseUtf8(tag.data, 1, i);
// do not include the null terminator in the tag value
tag.value = parseUtf8(tag.data, i + 1, tag.data.length - 1);
break;
}
}
tag.data = tag.value;
},
'WXXX': function(tag) {
var i;
if (tag.data[0] !== 3) {
// ignore frames with unrecognized character encodings
return;
}
for (i = 1; i < tag.data.length; i++) {
if (tag.data[i] === 0) {
// parse the description and URL fields
tag.description = parseUtf8(tag.data, 1, i);
tag.url = parseUtf8(tag.data, i + 1, tag.data.length);
break;
}
}
},
'PRIV': function(tag) {
var i;
for (i = 0; i < tag.data.length; i++) {
if (tag.data[i] === 0) {
// parse the description and URL fields
tag.owner = parseIso88591(tag.data, 0, i);
break;
}
}
tag.privateData = tag.data.subarray(i + 1);
tag.data = tag.privateData;
}
},
MetadataStream;
MetadataStream = function(options) {
var
settings = {
debug: !!(options && options.debug),
// the bytes of the program-level descriptor field in MP2T
// see ISO/IEC 13818-1:2013 (E), section 2.6 "Program and
// program element descriptors"
descriptor: options && options.descriptor
},
// the total size in bytes of the ID3 tag being parsed
tagSize = 0,
// tag data that is not complete enough to be parsed
buffer = [],
// the total number of bytes currently in the buffer
bufferSize = 0,
i;
MetadataStream.prototype.init.call(this);
// calculate the text track in-band metadata track dispatch type
// https://html.spec.whatwg.org/multipage/embedded-content.html#steps-to-expose-a-media-resource-specific-text-track
this.dispatchType = muxjs.mp2t.METADATA_STREAM_TYPE.toString(16);
if (settings.descriptor) {
for (i = 0; i < settings.descriptor.length; i++) {
this.dispatchType += ('00' + settings.descriptor[i].toString(16)).slice(-2);
}
}
this.push = function(chunk) {
var tag, frameStart, frameSize, frame, i;
if (chunk.type !== 'timed-metadata') {
return;
}
// if data_alignment_indicator is set in the PES header,
// we must have the start of a new ID3 tag. Assume anything
// remaining in the buffer was malformed and throw it out
if (chunk.dataAlignmentIndicator) {
bufferSize = 0;
buffer.length = 0;
}
// ignore events that don't look like ID3 data
if (buffer.length === 0 &&
(chunk.data.length < 10 ||
chunk.data[0] !== 'I'.charCodeAt(0) ||
chunk.data[1] !== 'D'.charCodeAt(0) ||
chunk.data[2] !== '3'.charCodeAt(0))) {
if (settings.debug) {
console.log('Skipping unrecognized metadata packet');
}
return;
}
// add this chunk to the data we've collected so far
buffer.push(chunk);
bufferSize += chunk.data.byteLength;
// grab the size of the entire frame from the ID3 header
if (buffer.length === 1) {
// the frame size is transmitted as a 28-bit integer in the
// last four bytes of the ID3 header.
// The most significant bit of each byte is dropped and the
// results concatenated to recover the actual value.
tagSize = parseSyncSafeInteger(chunk.data.subarray(6, 10));
// ID3 reports the tag size excluding the header but it's more
// convenient for our comparisons to include it
tagSize += 10;
}
// if the entire frame has not arrived, wait for more data
if (bufferSize < tagSize) {
return;
}
// collect the entire frame so it can be parsed
tag = {
data: new Uint8Array(tagSize),
frames: [],
pts: buffer[0].pts,
dts: buffer[0].dts
};
for (i = 0; i < tagSize;) {
tag.data.set(buffer[0].data.subarray(0, tagSize - i), i);
i += buffer[0].data.byteLength;
bufferSize -= buffer[0].data.byteLength;
buffer.shift();
}
// find the start of the first frame and the end of the tag
frameStart = 10;
if (tag.data[5] & 0x40) {
// advance the frame start past the extended header
frameStart += 4; // header size field
frameStart += parseSyncSafeInteger(tag.data.subarray(10, 14));
// clip any padding off the end
tagSize -= parseSyncSafeInteger(tag.data.subarray(16, 20));
}
// parse one or more ID3 frames
// http://id3.org/id3v2.3.0#ID3v2_frame_overview
do {
// determine the number of bytes in this frame
frameSize = parseSyncSafeInteger(tag.data.subarray(frameStart + 4, frameStart + 8));
if (frameSize < 1) {
return console.log('Malformed ID3 frame encountered. Skipping metadata parsing.');
}
frame = {
id: String.fromCharCode(tag.data[frameStart],
tag.data[frameStart + 1],
tag.data[frameStart + 2],
tag.data[frameStart + 3]),
data: tag.data.subarray(frameStart + 10, frameStart + frameSize + 10)
};
frame.key = frame.id;
if (tagParsers[frame.id]) {
tagParsers[frame.id](frame);
}
tag.frames.push(frame);
frameStart += 10; // advance past the frame header
frameStart += frameSize; // advance past the frame body
} while (frameStart < tagSize);
this.trigger('data', tag);
};
};
MetadataStream.prototype = new muxjs.utils.Stream();
// exports
muxjs.mp2t = muxjs.mp2t || {};
muxjs.mp2t.MetadataStream = MetadataStream;
})(this, this.muxjs);
/**
* mux.js
*
* Copyright (c) 2015 Brightcove
* All rights reserved.
*
* 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
*/
(function(window, muxjs, undefined) {
'use strict';
// -----------------
// Link To Transport
// -----------------
// Supplemental enhancement information (SEI) NAL units have a
// 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.
* Stops parsing once a message of type ITU T T35 has been found.
*
* @param bytes {Uint8Array} the bytes of a SEI NAL unit
* @return {object} the parsed SEI payload
* @see Rec. ITU-T H.264, 7.3.2.3.1
*/
var parseSei = function(bytes) {
var
i = 0,
result = {
payloadType: -1,
payloadSize: 0,
},
payloadType = 0,
payloadSize = 0;
// go through the sei_rbsp parsing each each individual sei_message
while (i < bytes.byteLength) {
// stop once we have hit the end of the sei_rbsp
if (bytes[i] === RBSP_TRAILING_BITS) {
break;
}
// Parse payload type
while (bytes[i] === 0xFF) {
payloadType += 255;
i++;
}
payloadType += bytes[i++];
// Parse payload size
while (bytes[i] === 0xFF) {
payloadSize += 255;
i++;
}
payloadSize += bytes[i++];
// this sei_message is a 608/708 caption so save it and break
// there can only ever be one caption message in a frame's sei
if (!result.payload && payloadType === USER_DATA_REGISTERED_ITU_T_T35) {
result.payloadType = payloadType;
result.payloadSize = payloadSize;
result.payload = bytes.subarray(i, i + payloadSize);
break;
}
// skip the payload and parse the next message
i += payloadSize;
payloadType = 0;
payloadSize = 0;
}
return result;
};
// see ANSI/SCTE 128-1 (2013), section 8.1
var parseUserData = function(sei) {
// itu_t_t35_contry_code must be 181 (United States) for
// captions
if (sei.payload[0] !== 181) {
return null;
}
// itu_t_t35_provider_code should be 49 (ATSC) for captions
if (((sei.payload[1] << 8) | sei.payload[2]) !== 49) {
return null;
}
// the user_identifier should be "GA94" to indicate ATSC1 data
if (String.fromCharCode(sei.payload[3],
sei.payload[4],
sei.payload[5],
sei.payload[6]) !== 'GA94') {
return null;
}
// finally, user_data_type_code should be 0x03 for caption data
if (sei.payload[7] !== 0x03) {
return null;
}
// return the user_data_type_structure and strip the trailing
// marker bits
return sei.payload.subarray(8, sei.payload.length - 1);
};
// see CEA-708-D, section 4.4
var parseCaptionPackets = function(pts, userData) {
var results = [], i, count, offset, data;
// if this is just filler, return immediately
if (!(userData[0] & 0x40)) {
return results;
}
// parse out the cc_data_1 and cc_data_2 fields
count = userData[0] & 0x1f;
for (i = 0; i < count; i++) {
offset = i * 3;
data = {
type: userData[offset + 2] & 0x03,
pts: pts
};
// capture cc data when cc_valid is 1
if (userData[offset + 2] & 0x04) {
data.ccData = (userData[offset + 3] << 8) | userData[offset + 4];
results.push(data);
}
}
return results;
};
var CaptionStream = function() {
var self = this;
CaptionStream.prototype.init.call(this);
this.captionPackets_ = [];
this.field1_ = new Cea608Stream();
// forward data and done events from field1_ to this CaptionStream
this.field1_.on('data', this.trigger.bind(this, 'data'));
this.field1_.on('done', this.trigger.bind(this, 'done'));
};
CaptionStream.prototype = new muxjs.utils.Stream();
CaptionStream.prototype.push = function(event) {
var sei, userData, captionPackets;
// only examine SEI NALs
if (event.nalUnitType !== 'sei_rbsp') {
return;
}
// parse the sei
sei = parseSei(event.escapedRBSP);
// ignore everything but user_data_registered_itu_t_t35
if (sei.payloadType !== USER_DATA_REGISTERED_ITU_T_T35) {
return;
}
// parse out the user data payload
userData = parseUserData(sei);
// ignore unrecognized userData
if (!userData) {
return;
}
// parse out CC data packets and save them for later
this.captionPackets_ = this.captionPackets_.concat(parseCaptionPackets(event.pts, userData));
};
CaptionStream.prototype.flush = function () {
// make sure we actually parsed captions before proceeding
if (!this.captionPackets_.length) {
this.field1_.flush();
return;
}
// sort caption byte-pairs based on their PTS values
this.captionPackets_.sort(function(a, b) {
return a.pts - b.pts;
});
// Push each caption into Cea608Stream
this.captionPackets_.forEach(this.field1_.push, this.field1_);
this.captionPackets_.length = 0;
this.field1_.flush();
return;
};
// ----------------------
// Session to Application
// ----------------------
var BASIC_CHARACTER_TRANSLATION = {
0x2a: 0xe1,
0x5c: 0xe9,
0x5e: 0xed,
0x5f: 0xf3,
0x60: 0xfa,
0x7b: 0xe7,
0x7c: 0xf7,
0x7d: 0xd1,
0x7e: 0xf1,
0x7f: 0x2588
};
// Constants for the byte codes recognized by Cea608Stream. This
// list is not exhaustive. For a more comprehensive listing and
// semantics see
// http://www.gpo.gov/fdsys/pkg/CFR-2010-title47-vol1/pdf/CFR-2010-title47-vol1-sec15-119.pdf
var PADDING = 0x0000,
// Pop-on Mode
RESUME_CAPTION_LOADING = 0x1420,
END_OF_CAPTION = 0x142f,
// Roll-up Mode
ROLL_UP_2_ROWS = 0x1425,
ROLL_UP_3_ROWS = 0x1426,
ROLL_UP_4_ROWS = 0x1427,
RESUME_DIRECT_CAPTIONING = 0x1429,
CARRIAGE_RETURN = 0x142d,
// Erasure
BACKSPACE = 0x1421,
ERASE_DISPLAYED_MEMORY = 0x142c,
ERASE_NON_DISPLAYED_MEMORY = 0x142e;
// the index of the last row in a CEA-608 display buffer
var BOTTOM_ROW = 14;
// CEA-608 captions are rendered onto a 34x15 matrix of character
// cells. The "bottom" row is the last element in the outer array.
var createDisplayBuffer = function() {
var result = [], i = BOTTOM_ROW + 1;
while (i--) {
result.push('');
}
return result;
};
var Cea608Stream = function() {
Cea608Stream.prototype.init.call(this);
this.mode_ = 'popOn';
// When in roll-up mode, the index of the last row that will
// actually display captions. If a caption is shifted to a row
// with a lower index than this, it is cleared from the display
// buffer
this.topRow_ = 0;
this.startPts_ = 0;
this.displayed_ = createDisplayBuffer();
this.nonDisplayed_ = createDisplayBuffer();
this.lastControlCode_ = null;
this.push = function(packet) {
var data, swap, char0, char1;
// remove the parity bits
data = packet.ccData & 0x7f7f;
// ignore duplicate control codes
if (data === this.lastControlCode_) {
this.lastControlCode_ = null;
return;
}
// Store control codes
if ((data & 0xf000) === 0x1000) {
this.lastControlCode_ = data;
} else {
this.lastControlCode_ = null;
}
switch (data) {
case PADDING:
break;
case RESUME_CAPTION_LOADING:
this.mode_ = 'popOn';
break;
case END_OF_CAPTION:
// if a caption was being displayed, it's gone now
this.flushDisplayed(packet.pts);
// flip memory
swap = this.displayed_;
this.displayed_ = this.nonDisplayed_;
this.nonDisplayed_ = swap;
// start measuring the time to display the caption
this.startPts_ = packet.pts;
break;
case ROLL_UP_2_ROWS:
this.topRow_ = BOTTOM_ROW - 1;
this.mode_ = 'rollUp';
break;
case ROLL_UP_3_ROWS:
this.topRow_ = BOTTOM_ROW - 2;
this.mode_ = 'rollUp';
break;
case ROLL_UP_4_ROWS:
this.topRow_ = BOTTOM_ROW - 3;
this.mode_ = 'rollUp';
break;
case CARRIAGE_RETURN:
this.flushDisplayed(packet.pts);
this.shiftRowsUp_();
this.startPts_ = packet.pts;
break;
case BACKSPACE:
if (this.mode_ === 'popOn') {
this.nonDisplayed_[BOTTOM_ROW] = this.nonDisplayed_[BOTTOM_ROW].slice(0, -1);
} else {
this.displayed_[BOTTOM_ROW] = this.displayed_[BOTTOM_ROW].slice(0, -1);
}
break;
case ERASE_DISPLAYED_MEMORY:
this.flushDisplayed(packet.pts);
this.displayed_ = createDisplayBuffer();
break;
case ERASE_NON_DISPLAYED_MEMORY:
this.nonDisplayed_ = createDisplayBuffer();
break;
default:
char0 = data >>> 8;
char1 = data & 0xff;
// Look for a Channel 1 Preamble Address Code
if (char0 >= 0x10 && char0 <= 0x17 &&
char1 >= 0x40 && char1 <= 0x7F &&
(char0 !== 0x10 || char1 < 0x60)) {
// Follow Safari's lead and replace the PAC with a space
char0 = char1 = 0x20;
}
// ignore unsupported control codes
if ((char0 & 0xf0) === 0x10) {
return;
}
// character handling is dependent on the current mode
this[this.mode_](packet.pts, char0, char1);
break;
}
};
};
Cea608Stream.prototype = new muxjs.utils.Stream();
// Trigger a cue point that captures the current state of the
// display buffer
Cea608Stream.prototype.flushDisplayed = function(pts) {
var row, i;
for (i = 0; i < this.displayed_.length; i++) {
row = this.displayed_[i];
if (row.length) {
this.trigger('data', {
startPts: this.startPts_,
endPts: pts,
text: row
});
}
}
};
// Mode Implementations
Cea608Stream.prototype.popOn = function(pts, char0, char1) {
var baseRow = this.nonDisplayed_[BOTTOM_ROW];
// buffer characters
char0 = BASIC_CHARACTER_TRANSLATION[char0] || char0;
baseRow += String.fromCharCode(char0);
char1 = BASIC_CHARACTER_TRANSLATION[char1] || char1;
baseRow += String.fromCharCode(char1);
this.nonDisplayed_[BOTTOM_ROW] = baseRow;
};
Cea608Stream.prototype.rollUp = function(pts, char0, char1) {
var baseRow = this.displayed_[BOTTOM_ROW];
if (baseRow === '') {
// we're starting to buffer new display input, so flush out the
// current display
this.flushDisplayed(pts);
this.startPts_ = pts;
}
char0 = BASIC_CHARACTER_TRANSLATION[char0] || char0;
baseRow += String.fromCharCode(char0);
char1 = BASIC_CHARACTER_TRANSLATION[char1] || char1;
baseRow += String.fromCharCode(char1);
this.displayed_[BOTTOM_ROW] = baseRow;
};
Cea608Stream.prototype.shiftRowsUp_ = function() {
var i;
// clear out inactive rows
for (i = 0; i < this.topRow_; i++) {
this.displayed_[i] = '';
}
// shift displayed rows up
for (i = this.topRow_; i < BOTTOM_ROW; i++) {
this.displayed_[i] = this.displayed_[i + 1];
}
// clear out the bottom row
this.displayed_[BOTTOM_ROW] = '';
};
// exports
muxjs.mp2t = muxjs.mp2t || {};
muxjs.mp2t.CaptionStream = CaptionStream;
muxjs.mp2t.Cea608Stream = Cea608Stream;
})(this, this.muxjs);
(function(window, muxjs) {
'use strict';
var
FlvTag = muxjs.flv.FlvTag,
MetadataStream = muxjs.MetadataStream,
Transmuxer,
VideoSegmentStream,
AudioSegmentStream,
CoalesceStream,
collectTimelineInfo,
metaDataTag,
extraDataTag;
/**
* Store information about the start and end of the tracka and the
* duration for each frame/sample we process in order to calculate
* the baseMediaDecodeTime
*/
collectTimelineInfo = function (track, data) {
if (typeof data.pts === 'number') {
if (track.timelineStartInfo.pts === undefined) {
track.timelineStartInfo.pts = data.pts;
} else {
track.timelineStartInfo.pts =
Math.min(track.timelineStartInfo.pts, data.pts);
}
}
if (typeof data.dts === 'number') {
if (track.timelineStartInfo.dts === undefined) {
track.timelineStartInfo.dts = data.dts;
} else {
track.timelineStartInfo.dts =
Math.min(track.timelineStartInfo.dts, data.dts);
}
}
};
metaDataTag = function(track, pts) {
var
tag = new FlvTag(FlvTag.METADATA_TAG); // :FlvTag
tag.dts = pts;
tag.pts = pts;
tag.writeMetaDataDouble("videocodecid", 7);
tag.writeMetaDataDouble("width", track.width);
tag.writeMetaDataDouble("height", track.height);
return tag;
};
extraDataTag = function(track, pts) {
var
i,
tag = new FlvTag(FlvTag.VIDEO_TAG, true);
tag.dts = pts;
tag.pts = pts;
tag.writeByte(0x01);// version
tag.writeByte(track.profileIdc);// profile
tag.writeByte(track.profileCompatibility);// compatibility
tag.writeByte(track.levelIdc);// level
tag.writeByte(0xFC | 0x03); // reserved (6 bits), NULA length size - 1 (2 bits)
tag.writeByte(0xE0 | 0x01 ); // reserved (3 bits), num of SPS (5 bits)
tag.writeShort( track.sps[0].length ); // data of SPS
tag.writeBytes( track.sps[0] ); // SPS
tag.writeByte(track.pps.length); // num of PPS (will there ever be more that 1 PPS?)
for (i = 0 ; i < track.pps.length ; ++i) {
tag.writeShort(track.pps[i].length); // 2 bytes for length of PPS
tag.writeBytes(track.pps[i]); // data of PPS
}
return tag;
};
/**
* Constructs a single-track, media segment from AAC data
* events. The output of this stream can be fed to flash.
*/
AudioSegmentStream = function(track) {
var
aacFrames = [],
aacFramesLength = 0,
sequenceNumber = 0,
earliestAllowedDts = 0,
oldExtraData;
AudioSegmentStream.prototype.init.call(this);
this.push = function(data) {
collectTimelineInfo(track, data);
if (track && track.channelcount === undefined) {
track.audioobjecttype = data.audioobjecttype;
track.channelcount = data.channelcount;
track.samplerate = data.samplerate;
track.samplingfrequencyindex = data.samplingfrequencyindex;
track.samplesize = data.samplesize;
track.extraData = (track.audioobjecttype << 11) |
(track.samplingfrequencyindex << 7) |
(track.channelcount << 3);
}
data.pts = Math.round(data.pts / 90);
data.dts = Math.round(data.dts / 90);
// buffer audio data until end() is called
aacFrames.push(data);
};
this.flush = function() {
var currentFrame, aacFrame, deltaDts,lastMetaPts, tags = [];
// return early if no audio data has been observed
if (aacFrames.length === 0) {
this.trigger('done');
return;
}
lastMetaPts = -Infinity;
while (aacFrames.length) {
currentFrame = aacFrames.shift();
// write out metadata tags every 1 second so that the decoder
// is re-initialized quickly after seeking into a different
// audio configuration
if (track.extraData !== oldExtraData || currentFrame.pts - lastMetaPts >= 1000) {
aacFrame = new FlvTag(FlvTag.METADATA_TAG);
aacFrame.pts = currentFrame.pts;
aacFrame.dts = currentFrame.dts;
// AAC is always 10
aacFrame.writeMetaDataDouble("audiocodecid", 10);
aacFrame.writeMetaDataBoolean("stereo", 2 === track.channelcount);
aacFrame.writeMetaDataDouble ("audiosamplerate", track.samplerate);
// Is AAC always 16 bit?
aacFrame.writeMetaDataDouble ("audiosamplesize", 16);
tags.push(aacFrame);
oldExtraData = track.extraData;
aacFrame = new FlvTag(FlvTag.AUDIO_TAG, true);
// For audio, DTS is always the same as PTS. We want to set the DTS
// however so we can compare with video DTS to determine approximate
// packet order
aacFrame.pts = currentFrame.pts;
aacFrame.dts = currentFrame.dts;
aacFrame.view.setUint16(aacFrame.position, track.extraData);
aacFrame.position += 2;
aacFrame.length = Math.max(aacFrame.length, aacFrame.position);
tags.push(aacFrame);
lastMetaPts = currentFrame.pts;
}
aacFrame = new FlvTag(FlvTag.AUDIO_TAG);
aacFrame.pts = currentFrame.pts;
aacFrame.dts = currentFrame.dts;
aacFrame.writeBytes(currentFrame.data);
tags.push(aacFrame);
}
oldExtraData = null;
this.trigger('data', {track: track, tags: tags});
this.trigger('done');
};
};
AudioSegmentStream.prototype = new muxjs.utils.Stream();
/**
* Store FlvTags for the h264 stream
* @param track {object} track metadata configuration
*/
VideoSegmentStream = function(track) {
var
sequenceNumber = 0,
nalUnits = [],
nalUnitsLength = 0,
config,
h264Frame;
VideoSegmentStream.prototype.init.call(this);
this.finishFrame = function(tags, frame) {
if (frame) {
// Check if keyframe and the length of tags.
// This makes sure we write metadata on the first frame of a segment.
if (track.newMetadata &&
(frame.keyFrame || tags.length === 0)) {
// Push extra data on every IDR frame in case we did a stream change + seek
tags.push(metaDataTag(config, frame.pts));
tags.push(extraDataTag(track, frame.pts));
track.newMetadata = false;
}
frame.endNalUnit();
tags.push(frame);
}
};
this.push = function(data) {
collectTimelineInfo(track, data);
data.pts = Math.round(data.pts / 90);
data.dts = Math.round(data.dts / 90);
// buffer video until flush() is called
nalUnits.push(data);
};
this.flush = function() {
var
currentNal,
tags = [];
// Throw away nalUnits at the start of the byte stream until we find
// the first AUD
while (nalUnits.length) {
if (nalUnits[0].nalUnitType === 'access_unit_delimiter_rbsp') {
break;
}
nalUnits.shift();
}
// return early if no video data has been observed
if (nalUnits.length === 0) {
this.trigger('done');
return;
}
while (nalUnits.length) {
currentNal = nalUnits.shift();
// record the track config
if (currentNal.nalUnitType === 'seq_parameter_set_rbsp') {
track.newMetadata = true;
config = currentNal.config;
track.width = config.width;
track.height = config.height;
track.sps = [currentNal.data];
track.profileIdc = config.profileIdc;
track.levelIdc = config.levelIdc;
track.profileCompatibility = config.profileCompatibility;
h264Frame.endNalUnit();
} else if (currentNal.nalUnitType === 'pic_parameter_set_rbsp') {
track.newMetadata = true;
track.pps = [currentNal.data];
h264Frame.endNalUnit();
} else if (currentNal.nalUnitType === 'access_unit_delimiter_rbsp') {
if (h264Frame) {
this.finishFrame(tags, h264Frame);
}
h264Frame = new FlvTag(FlvTag.VIDEO_TAG);
h264Frame.pts = currentNal.pts;
h264Frame.dts = currentNal.dts;
} else {
if (currentNal.nalUnitType === 'slice_layer_without_partitioning_rbsp_idr') {
// the current sample is a key frame
h264Frame.keyFrame = true;
}
h264Frame.endNalUnit();
}
h264Frame.startNalUnit();
h264Frame.writeBytes(currentNal.data);
}
if (h264Frame) {
this.finishFrame(tags, h264Frame);
}
this.trigger('data', {track: track, tags: tags});
// Continue with the flush process now
this.trigger('done');
};
};
VideoSegmentStream.prototype = new muxjs.utils.Stream();
/**
* The final stage of the transmuxer that emits the flv tags
* for audio, video, and metadata. Also tranlates in time and
* outputs caption data and id3 cues.
*/
CoalesceStream = function(options) {
// Number of Tracks per output segment
// If greater than 1, we combine multiple
// tracks into a single segment
this.numberOfTracks = 0;
this.metadataStream = options.metadataStream;
this.videoTags = [];
this.audioTags = [];
this.videoTrack = null;
this.audioTrack = null;
this.pendingCaptions = [];
this.pendingMetadata = [];
this.pendingTracks = 0;
CoalesceStream.prototype.init.call(this);
// Take output from multiple
this.push = function(output) {
// buffer incoming captions until the associated video segment
// finishes
if (output.text) {
return this.pendingCaptions.push(output);
}
// buffer incoming id3 tags until the final flush
if (output.frames) {
return this.pendingMetadata.push(output);
}
if (output.track.type === 'video') {
this.videoTrack = output.track;
this.videoTags = output.tags;
this.pendingTracks++;
}
if (output.track.type === 'audio') {
this.audioTrack = output.track;
this.audioTags = output.tags;
this.pendingTracks++;
}
};
};
CoalesceStream.prototype = new muxjs.utils.Stream();
CoalesceStream.prototype.flush = function() {
var
id3,
caption,
i,
timelineStartPts,
event = {
tags: {},
captions: [],
metadata: []
};
if (this.pendingTracks < this.numberOfTracks) {
return;
}
if (this.videoTrack) {
timelineStartPts = this.videoTrack.timelineStartInfo.pts;
} else if (this.audioTrack) {
timelineStartPts = this.audioTrack.timelineStartInfo.pts;
}
event.tags.videoTags = this.videoTags;
event.tags.audioTags = this.audioTags;
// Translate caption PTS times into second offsets into the
// video timeline for the segment
for (i = 0; i < this.pendingCaptions.length; i++) {
caption = this.pendingCaptions[i];
caption.startTime = caption.startPts - timelineStartPts;
caption.startTime /= 90e3;
caption.endTime = caption.endPts - timelineStartPts;
caption.endTime /= 90e3;
event.captions.push(caption);
}
// Translate ID3 frame PTS times into second offsets into the
// video timeline for the segment
for (i = 0; i < this.pendingMetadata.length; i++) {
id3 = this.pendingMetadata[i];
id3.cueTime = id3.pts - timelineStartPts;
id3.cueTime /= 90e3;
event.metadata.push(id3);
}
// We add this to every single emitted segment even though we only need
// it for the first
event.metadata.dispatchType = this.metadataStream.dispatchType;
// Reset stream state
this.videoTrack = null;
this.audioTrack = null;
this.videoTags = [];
this.audioTags = [];
this.pendingCaptions.length = 0;
this.pendingMetadata.length = 0;
this.pendingTracks = 0;
// Emit the final segment
this.trigger('data', event);
this.trigger('done');
};
/**
* An object that incrementally transmuxes MPEG2 Trasport Stream
* chunks into an FLV.
*/
Transmuxer = function(options) {
var
self = this,
videoTrack,
audioTrack,
packetStream, parseStream, elementaryStream,
aacStream, h264Stream,
videoSegmentStream, audioSegmentStream, captionStream,
coalesceStream;
Transmuxer.prototype.init.call(this);
options = options || {};
// expose the metadata stream
this.metadataStream = new muxjs.mp2t.MetadataStream();
options.metadataStream = this.metadataStream;
// set up the parsing pipeline
packetStream = new muxjs.mp2t.TransportPacketStream();
parseStream = new muxjs.mp2t.TransportParseStream();
elementaryStream = new muxjs.mp2t.ElementaryStream();
aacStream = new muxjs.codecs.AacStream();
h264Stream = new muxjs.codecs.H264Stream();
coalesceStream = new CoalesceStream(options);
// disassemble MPEG2-TS packets into elementary streams
packetStream
.pipe(parseStream)
.pipe(elementaryStream);
// !!THIS ORDER IS IMPORTANT!!
// demux the streams
elementaryStream
.pipe(h264Stream);
elementaryStream
.pipe(aacStream);
elementaryStream
.pipe(this.metadataStream)
.pipe(coalesceStream);
// if CEA-708 parsing is available, hook up a caption stream
if (muxjs.mp2t.CaptionStream) {
captionStream = new muxjs.mp2t.CaptionStream();
h264Stream.pipe(captionStream)
.pipe(coalesceStream);
}
// hook up the segment streams once track metadata is delivered
elementaryStream.on('data', function(data) {
var i, videoTrack, audioTrack;
if (data.type === 'metadata') {
i = data.tracks.length;
// scan the tracks listed in the metadata
while (i--) {
if (data.tracks[i].type === 'video') {
videoTrack = data.tracks[i];
} else if (data.tracks[i].type === 'audio') {
audioTrack = data.tracks[i];
}
}
// hook up the video segment stream to the first track with h264 data
if (videoTrack && !videoSegmentStream) {
coalesceStream.numberOfTracks++;
videoSegmentStream = new VideoSegmentStream(videoTrack);
// Set up the final part of the video pipeline
h264Stream
.pipe(videoSegmentStream)
.pipe(coalesceStream);
}
if (audioTrack && !audioSegmentStream) {
// hook up the audio segment stream to the first track with aac data
coalesceStream.numberOfTracks++;
audioSegmentStream = new AudioSegmentStream(audioTrack);
// Set up the final part of the audio pipeline
aacStream
.pipe(audioSegmentStream)
.pipe(coalesceStream);
}
}
});
// feed incoming data to the front of the parsing pipeline
this.push = function(data) {
packetStream.push(data);
};
// flush any buffered data
this.flush = function() {
// Start at the top of the pipeline and flush all pending work
packetStream.flush();
};
// Re-emit any data coming from the coalesce stream to the outside world
coalesceStream.on('data', function (event) {
self.trigger('data', event);
});
// Let the consumer know we have finished flushing the entire pipeline
coalesceStream.on('done', function () {
self.trigger('done');
});
// For information on the FLV format, see
// http://download.macromedia.com/f4v/video_file_format_spec_v10_1.pdf.
// Technically, this function returns the header and a metadata FLV tag
// if duration is greater than zero
// duration in seconds
// @return {object} the bytes of the FLV header as a Uint8Array
this.getFlvHeader = function(duration, audio, video) { // :ByteArray {
var
headBytes = new Uint8Array(3 + 1 + 1 + 4),
head = new DataView(headBytes.buffer),
metadata,
result,
metadataLength;
// default arguments
duration = duration || 0;
audio = audio === undefined? true : audio;
video = video === undefined? true : video;
// signature
head.setUint8(0, 0x46); // 'F'
head.setUint8(1, 0x4c); // 'L'
head.setUint8(2, 0x56); // 'V'
// version
head.setUint8(3, 0x01);
// flags
head.setUint8(4, (audio ? 0x04 : 0x00) | (video ? 0x01 : 0x00));
// data offset, should be 9 for FLV v1
head.setUint32(5, headBytes.byteLength);
// init the first FLV tag
if (duration <= 0) {
// no duration available so just write the first field of the first
// FLV tag
result = new Uint8Array(headBytes.byteLength + 4);
result.set(headBytes);
result.set([0, 0, 0, 0], headBytes.byteLength);
return result;
}
// write out the duration metadata tag
metadata = new FlvTag(FlvTag.METADATA_TAG);
metadata.pts = metadata.dts = 0;
metadata.writeMetaDataDouble("duration", duration);
metadataLength = metadata.finalize().length;
result = new Uint8Array(headBytes.byteLength + metadataLength);
result.set(headBytes);
result.set(head.byteLength, metadataLength);
return result;
};
};
Transmuxer.prototype = new muxjs.utils.Stream();
// forward compatibility
muxjs.flv = muxjs.flv || {};
muxjs.flv.Transmuxer = Transmuxer;
})(this, this.muxjs);
(function(window, muxjs, undefined){
'use strict';
var urlCount = 0,
EventTarget = videojs.EventTarget,
defaults,
VirtualSourceBuffer,
flvCodec = /video\/flv(;\s*codecs=["']vp6,aac["'])?$/,
objectUrlPrefix = 'blob:vjs-media-source/',
interceptBufferCreation,
aggregateUpdateHandler,
scheduleTick,
Cue,
deprecateOldCue,
removeCuesFromTrack,
createTextTracksIfNecessary,
addTextTrackData;
deprecateOldCue = function(cue) {
Object.defineProperties(cue.frame, {
'id': {
get: function() {
videojs.log.warn('cue.frame.id is deprecated. Use cue.value.key instead.');
return cue.value.key;
}
},
'value': {
get: function() {
videojs.log.warn('cue.frame.value is deprecated. Use cue.value.data instead.');
return cue.value.data;
}
},
'privateData': {
get: function() {
videojs.log.warn('cue.frame.privateData is deprecated. Use cue.value.data instead.');
return cue.value.data;
}
}
});
};
removeCuesFromTrack = function(start, end, track) {
var i, cue;
if (!track) {
return;
}
i = track.cues.length;
while(i--) {
cue = track.cues[i];
// Remove any overlapping cue
if (cue.startTime <= end && cue.endTime >= start) {
track.removeCue(cue);
}
}
};
createTextTracksIfNecessary = function (sourceBuffer, mediaSource, segment) {
// create an in-band caption track if one is present in the segment
if (segment.captions &&
segment.captions.length &&
!sourceBuffer.inbandTextTrack_) {
sourceBuffer.inbandTextTrack_ = mediaSource.player_.addTextTrack('captions', 'cc1');
}
if (segment.metadata &&
segment.metadata.length &&
!sourceBuffer.metadataTrack_) {
sourceBuffer.metadataTrack_ = mediaSource.player_.addTextTrack('metadata', 'Timed Metadata');
sourceBuffer.metadataTrack_.inBandMetadataTrackDispatchType = segment.metadata.dispatchType;
}
};
addTextTrackData = function (sourceHandler, captionArray, metadataArray) {
Cue = window.WebKitDataCue || window.VTTCue;
if (captionArray) {
captionArray.forEach(function (caption) {
this.inbandTextTrack_.addCue(
new Cue(
caption.startTime + this.timestampOffset,
caption.endTime + this.timestampOffset,
caption.text
));
}, sourceHandler);
}
if (metadataArray) {
metadataArray.forEach(function(metadata) {
var time = metadata.cueTime + this.timestampOffset;
metadata.frames.forEach(function(frame) {
var cue = new Cue(
time,
time,
frame.value || frame.url || frame.data || '');
cue.frame = frame;
cue.value = frame;
deprecateOldCue(cue);
this.metadataTrack_.addCue(cue);
}, this);
}, sourceHandler);
}
};
// ------------
// Media Source
// ------------
defaults = {
// how to determine the MediaSource implementation to use. There
// are three available modes:
// - auto: use native MediaSources where available and Flash
// everywhere else
// - html5: always use native MediaSources
// - flash: always use the Flash MediaSource polyfill
mode: 'auto'
};
videojs.MediaSource = function(options) {
var settings = videojs.mergeOptions(defaults, options);
// determine whether HTML MediaSources should be used
if (settings.mode === 'html5' ||
(settings.mode === 'auto' &&
videojs.MediaSource.supportsNativeMediaSources())) {
return new videojs.HtmlMediaSource();
}
// otherwise, emulate them through the SWF
return new videojs.FlashMediaSource();
};
videojs.MediaSource.supportsNativeMediaSources = function() {
return !!window.MediaSource;
};
// ----
// HTML
// ----
videojs.HtmlMediaSource = videojs.extend(EventTarget, {
constructor: function() {
var self = this, property;
this.mediaSource_ = new window.MediaSource();
// delegate to the native MediaSource's methods by default
for (property in this.mediaSource_) {
if (!(property in videojs.HtmlMediaSource.prototype) &&
typeof this.mediaSource_[property] === 'function') {
this[property] = this.mediaSource_[property].bind(this.mediaSource_);
}
}
// emulate `duration` and `seekable` until seeking can be
// handled uniformly for live streams
// see https://github.com/w3c/media-source/issues/5
this.duration_ = NaN;
Object.defineProperty(this, 'duration', {
get: function() {
return self.duration_;
},
set: function(duration) {
var currentDuration;
self.duration_ = duration;
if (duration !== Infinity) {
self.mediaSource_.duration = duration;
return;
}
}
});
Object.defineProperty(this, 'seekable', {
get: function() {
if (this.duration_ === Infinity) {
return videojs.createTimeRanges([[0, self.mediaSource_.duration]]);
}
return self.mediaSource_.seekable;
}
});
Object.defineProperty(this, 'readyState', {
get: function() {
return self.mediaSource_.readyState;
}
});
// the list of virtual and native SourceBuffers created by this
// MediaSource
this.sourceBuffers = [];
// Re-emit MediaSource events on the polyfill
[
'sourceopen',
'sourceclose',
'sourceended'
].forEach(function(eventName) {
this.mediaSource_.addEventListener(eventName, this.trigger.bind(this));
}, this);
// capture the associated player when the MediaSource is
// successfully attached
this.on('sourceopen', function(event) {
var video = document.querySelector('[src="' + self.url_ + '"]');
if (!video) {
return;
}
self.player_ = videojs(video.parentNode);
});
// explicitly terminate any WebWorkers that were created
// by SourceHandlers
this.on('sourceclose', function(event) {
this.sourceBuffers.forEach(function(sourceBuffer) {
if (sourceBuffer.transmuxer_) {
sourceBuffer.transmuxer_.terminate();
}
});
this.sourceBuffers.length = 0;
});
},
addSeekableRange_: function(start, end) {
var error;
if (this.duration !== Infinity) {
error = new Error('MediaSource.addSeekableRange() can only be invoked ' +
'when the duration is Infinity');
error.name = 'InvalidStateError';
error.code = 11;
throw error;
}
if (end > this.mediaSource_.duration ||
isNaN(this.mediaSource_.duration)) {
this.mediaSource_.duration = end;
}
},
addSourceBuffer: function(type) {
var
buffer,
codecs,
avcCodec,
mp4aCodec,
avcRegEx = /avc1\.[\da-f]+/i,
mp4aRegEx = /mp4a\.\d+.\d+/i;
// create a virtual source buffer to transmux MPEG-2 transport
// stream segments into fragmented MP4s
if ((/^video\/mp2t/i).test(type)) {
codecs = type.split(';').slice(1).join(';');
codecs = translateLegacyCodecs(codecs);
// Pull out each individual codec string if it exists
avcCodec = (codecs.match(avcRegEx) || [])[0];
mp4aCodec = (codecs.match(mp4aRegEx) || [])[0];
// If a codec is unspecified, use the defaults
if (!avcCodec || !avcCodec.length) {
avcCodec = 'avc1.4d400d';
}
if (!mp4aCodec || !mp4aCodec.length) {
mp4aCodec = 'mp4a.40.2';
}
buffer = new VirtualSourceBuffer(this, [avcCodec, mp4aCodec]);
this.sourceBuffers.push(buffer);
return buffer;
}
// delegate to the native implementation
buffer = this.mediaSource_.addSourceBuffer(type);
this.sourceBuffers.push(buffer);
return buffer;
}
});
// Replace the old apple-style `avc1.<dd>.<dd>` codec string with the standard
// `avc1.<hhhhhh>`
var translateLegacyCodecs = function(codecs) {
return codecs.replace(/avc1\.(\d+)\.(\d+)/i, function(orig, profile, avcLevel) {
var
profileHex = ('00' + Number(profile).toString(16)).slice(-2),
avcLevelHex = ('00' + Number(avcLevel).toString(16)).slice(-2);
return 'avc1.' + profileHex + '00' + avcLevelHex;
});
};
aggregateUpdateHandler = function(mediaSource, guardBufferName, type) {
return function() {
if (!mediaSource[guardBufferName] || !mediaSource[guardBufferName].updating) {
return mediaSource.trigger(type);
}
};
};
VirtualSourceBuffer = videojs.extend(EventTarget, {
constructor: function VirtualSourceBuffer(mediaSource, codecs) {
var self = this;
this.timestampOffset_ = 0;
this.pendingBuffers_ = [];
this.bufferUpdating_ = false;
this.mediaSource_ = mediaSource;
this.codecs_ = codecs;
this.transmuxer_ = new Worker(URL.createObjectURL(new Blob(["var muxjs={},transmuxer,initOptions={};!function(a,b,c){var d=function(){this.init=function(){var a={};this.on=function(b,c){a[b]||(a[b]=[]),a[b].push(c)},this.off=function(b,c){var d;return a[b]?(d=a[b].indexOf(c),a[b].splice(d,1),d>-1):!1},this.trigger=function(b){var c,d,e,f;if(c=a[b])if(2===arguments.length)for(e=c.length,d=0;e>d;++d)c[d].call(this,arguments[1]);else{for(f=[],d=arguments.length,d=1;d<arguments.length;++d)f.push(arguments[d]);for(e=c.length,d=0;e>d;++d)c[d].apply(this,f)}},this.dispose=function(){a={}}}};d.prototype.pipe=function(a){return this.on(\"data\",function(b){a.push(b)}),this.on(\"done\",function(){a.flush()}),a},d.prototype.push=function(a){this.trigger(\"data\",a)},d.prototype.flush=function(){this.trigger(\"done\")},a.muxjs=a.muxjs||{},a.muxjs.utils=a.muxjs.utils||{},a.muxjs.utils.Stream=d}(this,this.muxjs),function(a,b){var c;c=function(a){var b=a.byteLength,c=0,d=0;this.length=function(){return 8*b},this.bitsAvailable=function(){return 8*b+d},this.loadWord=function(){var e=a.byteLength-b,f=new Uint8Array(4),g=Math.min(4,b);if(0===g)throw new Error(\"no bytes available\");f.set(a.subarray(e,e+g)),c=new DataView(f.buffer).getUint32(0),d=8*g,b-=g},this.skipBits=function(a){var e;d>a?(c<<=a,d-=a):(a-=d,e=Math.floor(a/8),a-=8*e,b-=e,this.loadWord(),c<<=a,d-=a)},this.readBits=function(a){var e=Math.min(d,a),f=c>>>32-e;return console.assert(32>a,\"Cannot read more than 32 bits at a time\"),d-=e,d>0?c<<=e:b>0&&this.loadWord(),e=a-e,e>0?f<<e|this.readBits(e):f},this.skipLeadingZeros=function(){var a;for(a=0;d>a;++a)if(0!==(c&2147483648>>>a))return c<<=a,d-=a,a;return this.loadWord(),a+this.skipLeadingZeros()},this.skipUnsignedExpGolomb=function(){this.skipBits(1+this.skipLeadingZeros())},this.skipExpGolomb=function(){this.skipBits(1+this.skipLeadingZeros())},this.readUnsignedExpGolomb=function(){var a=this.skipLeadingZeros();return this.readBits(a+1)-1},this.readExpGolomb=function(){var a=this.readUnsignedExpGolomb();return 1&a?1+a>>>1:-1*(a>>>1)},this.readBoolean=function(){return 1===this.readBits(1)},this.readUnsignedByte=function(){return this.readBits(8)},this.loadWord()},a.muxjs=b||{},b.utils=b.utils||{},b.utils.ExpGolomb=c}(this,this.muxjs),function(a,b,c){\"use strict\";var d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P;O=a.Uint8Array,P=a.DataView,function(){var a;A={avc1:[],avcC:[],btrt:[],dinf:[],dref:[],esds:[],ftyp:[],hdlr:[],mdat:[],mdhd:[],mdia:[],mfhd:[],minf:[],moof:[],moov:[],mp4a:[],mvex:[],mvhd:[],sdtp:[],smhd:[],stbl:[],stco:[],stsc:[],stsd:[],stsz:[],stts:[],styp:[],tfdt:[],tfhd:[],traf:[],trak:[],trun:[],trex:[],tkhd:[],vmhd:[]};for(a in A)A.hasOwnProperty(a)&&(A[a]=[a.charCodeAt(0),a.charCodeAt(1),a.charCodeAt(2),a.charCodeAt(3)]);B=new O([\"i\".charCodeAt(0),\"s\".charCodeAt(0),\"o\".charCodeAt(0),\"m\".charCodeAt(0)]),D=new O([\"a\".charCodeAt(0),\"v\".charCodeAt(0),\"c\".charCodeAt(0),\"1\".charCodeAt(0)]),C=new O([0,0,0,1]),E=new O([0,0,0,0,0,0,0,0,118,105,100,101,0,0,0,0,0,0,0,0,0,0,0,0,86,105,100,101,111,72,97,110,100,108,101,114,0]),F=new O([0,0,0,0,0,0,0,0,115,111,117,110,0,0,0,0,0,0,0,0,0,0,0,0,83,111,117,110,100,72,97,110,100,108,101,114,0]),G={video:E,audio:F},J=new O([0,0,0,0,0,0,0,1,0,0,0,12,117,114,108,32,0,0,0,1]),I=new O([0,0,0,0,0,0,0,0]),K=new O([0,0,0,0,0,0,0,0]),L=K,M=new O([0,0,0,0,0,0,0,0,0,0,0,0]),N=K,H=new O([0,0,0,1,0,0,0,0,0,0,0,0])}(),d=function(a){var b,c,d,e=[],f=0;for(b=1;b<arguments.length;b++)e.push(arguments[b]);for(b=e.length;b--;)f+=e[b].byteLength;for(c=new O(f+8),d=new P(c.buffer,c.byteOffset,c.byteLength),d.setUint32(0,c.byteLength),c.set(a,4),b=0,f=8;b<e.length;b++)c.set(e[b],f),f+=e[b].byteLength;return c},e=function(){return d(A.dinf,d(A.dref,J))},f=function(a){return d(A.esds,new O([0,0,0,0,3,25,0,0,0,4,17,64,21,0,6,0,0,0,218,192,0,0,218,192,5,2,a.audioobjecttype<<3|a.samplingfrequencyindex>>>1,a.samplingfrequencyindex<<7|a.channelcount<<3,6,1,2]))},g=function(){return d(A.ftyp,B,C,B,D)},s=function(a){return d(A.hdlr,G[a])},h=function(a){return d(A.mdat,a)},r=function(a){var b=new O([0,0,0,0,0,0,0,2,0,0,0,3,0,1,95,144,a.duration>>>24&255,a.duration>>>16&255,a.duration>>>8&255,255&a.duration,85,196,0,0]);return a.samplerate&&(b[12]=a.samplerate>>>24&255,b[13]=a.samplerate>>>16&255,b[14]=a.samplerate>>>8&255,b[15]=255&a.samplerate),d(A.mdhd,b)},q=function(a){return d(A.mdia,r(a),s(a.type),j(a))},i=function(a){return d(A.mfhd,new O([0,0,0,0,(4278190080&a)>>24,(16711680&a)>>16,(65280&a)>>8,255&a]))},j=function(a){return d(A.minf,\"video\"===a.type?d(A.vmhd,H):d(A.smhd,I),e(),u(a))},k=function(a,b){for(var c=[],e=b.length;e--;)c[e]=x(b[e]);return d.apply(null,[A.moof,i(a)].concat(c))},l=function(a){for(var b=a.length,c=[];b--;)c[b]=o(a[b]);return d.apply(null,[A.moov,n(4294967295)].concat(c).concat(m(a)))},m=function(a){for(var b=a.length,c=[];b--;)c[b]=y(a[b]);return d.apply(null,[A.mvex].concat(c))},n=function(a){var b=new O([0,0,0,0,0,0,0,1,0,0,0,2,0,1,95,144,(4278190080&a)>>24,(16711680&a)>>16,(65280&a)>>8,255&a,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,64,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,255,255,255,255]);return d(A.mvhd,b)},t=function(a){var b,c,e=a.samples||[],f=new O(4+e.length);for(c=0;c<e.length;c++)b=e[c].flags,f[c+4]=b.dependsOn<<4|b.isDependedOn<<2|b.hasRedundancy;return d(A.sdtp,f)},u=function(a){return d(A.stbl,v(a),d(A.stts,N),d(A.stsc,L),d(A.stsz,M),d(A.stco,K))},function(){var a,b;v=function(c){return d(A.stsd,new O([0,0,0,0,0,0,0,1]),\"video\"===c.type?a(c):b(c))},a=function(a){var 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c,f,g,h;for(f=a.samples||[],b+=20+16*f.length,c=e(f,b),h=0;h<f.length;h++)g=f[h],c=c.concat([(4278190080&g.duration)>>>24,(16711680&g.duration)>>>16,(65280&g.duration)>>>8,255&g.duration,(4278190080&g.size)>>>24,(16711680&g.size)>>>16,(65280&g.size)>>>8,255&g.size,g.flags.isLeading<<2|g.flags.dependsOn,g.flags.isDependedOn<<6|g.flags.hasRedundancy<<4|g.flags.paddingValue<<1|g.flags.isNonSyncSample,61440&g.flags.degradationPriority,15&g.flags.degradationPriority,(4278190080&g.compositionTimeOffset)>>>24,(16711680&g.compositionTimeOffset)>>>16,(65280&g.compositionTimeOffset)>>>8,255&g.compositionTimeOffset]);return d(A.trun,new O(c))},a=function(a,b){var c,f,g,h;for(f=a.samples||[],b+=20+8*f.length,c=e(f,b),h=0;h<f.length;h++)g=f[h],c=c.concat([(4278190080&g.duration)>>>24,(16711680&g.duration)>>>16,(65280&g.duration)>>>8,255&g.duration,(4278190080&g.size)>>>24,(16711680&g.size)>>>16,(65280&g.size)>>>8,255&g.size]);return d(A.trun,new O(c))},z=function(c,d){return\"audio\"===c.type?a(c,d):b(c,d)}}(),b.mp4={ftyp:g,mdat:h,moof:k,moov:l,initSegment:function(a){var b,c=g(),d=l(a);return b=new O(c.byteLength+d.byteLength),b.set(c),b.set(d,c.byteLength),b}}}(this,this.muxjs),function(a,b){\"use strict\";var c,d=[96e3,88200,64e3,48e3,44100,32e3,24e3,22050,16e3,12e3,11025,8e3,7350];c=function(){var a,b;c.prototype.init.call(this),a=this,this.push=function(a){var c,e,f,g,h,i,j=0,k=0;if(\"audio\"===a.type)for(b?(g=b,b=new Uint8Array(g.byteLength+a.data.byteLength),b.set(g),b.set(a.data,g.byteLength)):b=a.data;j+5<b.length;)if(255===b[j]&&240===(246&b[j+1])){if(e=2*(1&~b[j+1]),c=(3&b[j+3])<<11|b[j+4]<<3|(224&b[j+5])>>5,h=1024*((3&b[j+6])+1),i=9e4*h/d[(60&b[j+2])>>>2],f=j+c,b.byteLength<f)return;if(this.trigger(\"data\",{pts:a.pts+k*i,dts:a.dts+k*i,sampleCount:h,audioobjecttype:(b[j+2]>>>6&3)+1,channelcount:(1&b[j+2])<<3|(192&b[j+3])>>>6,samplerate:d[(60&b[j+2])>>>2],samplingfrequencyindex:(60&b[j+2])>>>2,samplesize:16,data:b.subarray(j+7+e,f)}),b.byteLength===f)return void(b=void 0);k++,b=b.subarray(f)}else j++}},c.prototype=new b.utils.Stream,b.codecs=b.codecs||{},b.codecs.AacStream=c}(this,this.muxjs),function(a,b){\"use strict\";var c,d;d=function(){var a,b,c=0;d.prototype.init.call(this),this.push=function(d){var e;for(b?(e=new 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6:c.nalUnitType=\"sei_rbsp\",c.escapedRBSP=h(b.subarray(1));break;case 7:c.nalUnitType=\"seq_parameter_set_rbsp\",c.escapedRBSP=h(b.subarray(1)),c.config=i(c.escapedRBSP);break;case 8:c.nalUnitType=\"pic_parameter_set_rbsp\";break;case 9:c.nalUnitType=\"access_unit_delimiter_rbsp\"}a.trigger(\"data\",c)}),k.on(\"done\",function(){a.trigger(\"done\")}),this.flush=function(){k.flush()},j=function(a,b){var c,d,e=8,f=8;for(c=0;a>c;c++)0!==f&&(d=b.readExpGolomb(),f=(e+d+256)%256),e=0===f?e:f},h=function(a){for(var b,c,d=a.byteLength,e=[],f=1;d-2>f;)0===a[f]&&0===a[f+1]&&3===a[f+2]?(e.push(f+2),f+=2):f++;if(0===e.length)return a;b=d-e.length,c=new Uint8Array(b);var g=0;for(f=0;b>f;g++,f++)g===e[0]&&(g++,e.shift()),c[f]=a[g];return c},i=function(a){var c,d,e,f,g,h,i,k,l,m,n,o,p=0,q=0,r=0,s=0;if(c=new b.utils.ExpGolomb(a),d=c.readUnsignedByte(),f=c.readUnsignedByte(),e=c.readUnsignedByte(),c.skipUnsignedExpGolomb(),(100===d||110===d||122===d||244===d||44===d||83===d||86===d||118===d||128===d||138===d||139===d||134===d)&&(g=c.readUnsignedExpGolomb(),3===g&&c.skipBits(1),c.skipUnsignedExpGolomb(),c.skipUnsignedExpGolomb(),c.skipBits(1),c.readBoolean()))for(n=3!==g?8:12,o=0;n>o;o++)c.readBoolean()&&(6>o?j(16,c):j(64,c));if(c.skipUnsignedExpGolomb(),h=c.readUnsignedExpGolomb(),0===h)c.readUnsignedExpGolomb();else if(1===h)for(c.skipBits(1),c.skipExpGolomb(),c.skipExpGolomb(),i=c.readUnsignedExpGolomb(),o=0;i>o;o++)c.skipExpGolomb();return c.skipUnsignedExpGolomb(),c.skipBits(1),k=c.readUnsignedExpGolomb(),l=c.readUnsignedExpGolomb(),m=c.readBits(1),0===m&&c.skipBits(1),c.skipBits(1),c.readBoolean()&&(p=c.readUnsignedExpGolomb(),q=c.readUnsignedExpGolomb(),r=c.readUnsignedExpGolomb(),s=c.readUnsignedExpGolomb()),{profileIdc:d,levelIdc:e,profileCompatibility:f,width:16*(k+1)-2*p-2*q,height:(2-m)*(l+1)*16-2*r-2*s}}},c.prototype=new b.utils.Stream,b.codecs=b.codecs||{},b.codecs.H264Stream=c,b.codecs.NalByteStream=d}(this,this.muxjs),function(a,b,c){\"use strict\";var d,e,f,g,h,i,j,k;g=188,k=71,h=27,i=15,j=21,d=function(){var a=new Uint8Array(g),b=0;d.prototype.init.call(this),this.push=function(c){var d,e=0,f=g;for(b?(d=new 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c,d,e,g;if(1&a[5]){for(f.programMapTable={},c=(15&a[1])<<8|a[2],d=3+c-4,e=(15&a[10])<<8|a[11],g=12+e;d>g;)f.programMapTable[(31&a[g+1])<<8|a[g+2]]=a[g],g+=((15&a[g+3])<<8|a[g+4])+5;for(b.programMapTable=f.programMapTable;f.packetsWaitingForPmt.length;)f.processPes_.apply(f,f.packetsWaitingForPmt.shift())}},this.push=function(b){var d={},e=4;d.payloadUnitStartIndicator=!!(64&b[1]),d.pid=31&b[1],d.pid<<=8,d.pid|=b[2],(48&b[3])>>>4>1&&(e+=b[e]+1),0===d.pid?(d.type=\"pat\",a(b.subarray(e),d),this.trigger(\"data\",d)):d.pid===this.pmtPid?(d.type=\"pmt\",a(b.subarray(e),d),this.trigger(\"data\",d)):this.programMapTable===c?this.packetsWaitingForPmt.push([b,e,d]):this.processPes_(b,e,d)},this.processPes_=function(a,b,c){c.streamType=this.programMapTable[c.pid],c.type=\"pes\",c.data=a.subarray(b),this.trigger(\"data\",c)}},e.prototype=new b.utils.Stream,e.STREAM_TYPES={h264:27,adts:15},f=function(){var a,b={data:[],size:0},c={data:[],size:0},d={data:[],size:0},e=function(a,b){var c;b.dataAlignmentIndicator=0!==(4&a[6]),c=a[7],192&c&&(b.pts=(14&a[9])<<27|(255&a[10])<<20|(254&a[11])<<12|(255&a[12])<<5|(254&a[13])>>>3,b.pts*=4,b.pts+=(6&a[13])>>>1,b.dts=b.pts,64&c&&(b.dts=(14&a[14])<<27|(255&a[15])<<20|(254&a[16])<<12|(255&a[17])<<5|(254&a[18])>>>3,b.dts*=4,b.dts+=(6&a[18])>>>1)),b.data=a.subarray(9+a[8])},g=function(b,c){var d,f=new Uint8Array(b.size),g={type:c},h=0;if(b.data.length){for(g.trackId=b.data[0].pid;b.data.length;)d=b.data.shift(),f.set(d.data,h),h+=d.data.byteLength;e(f,g),b.size=0,a.trigger(\"data\",g)}};f.prototype.init.call(this),a=this,this.push=function(e){({pat:function(){},pes:function(){var a,f;switch(e.streamType){case h:a=b,f=\"video\";break;case i:a=c,f=\"audio\";break;case j:a=d,f=\"timed-metadata\";break;default:return}e.payloadUnitStartIndicator&&g(a,f),a.data.push(e),a.size+=e.data.byteLength},pmt:function(){var b,c,d={type:\"metadata\",tracks:[]},f=e.programMapTable;for(b in f)f.hasOwnProperty(b)&&(c={timelineStartInfo:{baseMediaDecodeTime:0}},c.id=+b,f[b]===h?(c.codec=\"avc\",c.type=\"video\"):f[b]===i&&(c.codec=\"adts\",c.type=\"audio\"),d.tracks.push(c));a.trigger(\"data\",d)}})[e.type]()},this.flush=function(){g(b,\"video\"),g(c,\"audio\"),g(d,\"timed-metadata\"),this.trigger(\"done\")}},f.prototype=new b.utils.Stream,b.mp2t=b.mp2t||{},b.mp2t.PAT_PID=0,b.mp2t.MP2T_PACKET_LENGTH=g,b.mp2t.H264_STREAM_TYPE=h,b.mp2t.ADTS_STREAM_TYPE=i,b.mp2t.METADATA_STREAM_TYPE=j,b.mp2t.TransportPacketStream=d,b.mp2t.TransportParseStream=e,b.mp2t.ElementaryStream=f}(this,this.muxjs),function(a,b,c){\"use strict\";var d=4,e=128,f=function(a){for(var b=0,c={payloadType:-1,payloadSize:0},f=0,g=0;b<a.byteLength&&a[b]!==e;){for(;255===a[b];)f+=255,b++;for(f+=a[b++];255===a[b];)g+=255,b++;if(g+=a[b++],!c.payload&&f===d){c.payloadType=f,c.payloadSize=g,c.payload=a.subarray(b,b+g);break}b+=g,f=0,g=0}return c},g=function(a){return 181!==a.payload[0]?null:49!==(a.payload[1]<<8|a.payload[2])?null:\"GA94\"!==String.fromCharCode(a.payload[3],a.payload[4],a.payload[5],a.payload[6])?null:3!==a.payload[7]?null:a.payload.subarray(8,a.payload.length-1)},h=function(a,b){var c,d,e,f,g=[];if(!(64&b[0]))return g;for(d=31&b[0],c=0;d>c;c++)e=3*c,f={type:3&b[e+2],pts:a},4&b[e+2]&&(f.ccData=b[e+3]<<8|b[e+4],g.push(f));return g},i=function(){i.prototype.init.call(this),this.captionPackets_=[],this.field1_=new w,this.field1_.on(\"data\",this.trigger.bind(this,\"data\")),this.field1_.on(\"done\",this.trigger.bind(this,\"done\"))};i.prototype=new b.utils.Stream,i.prototype.push=function(a){var b,c;\"sei_rbsp\"===a.nalUnitType&&(b=f(a.escapedRBSP),b.payloadType===d&&(c=g(b),c&&(this.captionPackets_=this.captionPackets_.concat(h(a.pts,c)))))},i.prototype.flush=function(){return this.captionPackets_.length?(this.captionPackets_.sort(function(a,b){return a.pts-b.pts}),this.captionPackets_.forEach(this.field1_.push,this.field1_),this.captionPackets_.length=0,void this.field1_.flush()):void this.field1_.flush()};var j={42:225,92:233,94:237,95:243,96:250,123:231,124:247,125:209,126:241,127:9608},k=0,l=5152,m=5167,n=5157,o=5158,p=5159,q=5165,r=5153,s=5164,t=5166,u=14,v=function(){for(var a=[],b=u+1;b--;)a.push(\"\");return a},w=function(){w.prototype.init.call(this),this.mode_=\"popOn\",this.topRow_=0,this.startPts_=0,this.displayed_=v(),this.nonDisplayed_=v(),this.lastControlCode_=null,this.push=function(a){var b,c,d,e;if(b=32639&a.ccData,b===this.lastControlCode_)return void(this.lastControlCode_=null);switch(4096===(61440&b)?this.lastControlCode_=b:this.lastControlCode_=null,b){case k:break;case l:this.mode_=\"popOn\";break;case m:this.flushDisplayed(a.pts),c=this.displayed_,this.displayed_=this.nonDisplayed_,this.nonDisplayed_=c,this.startPts_=a.pts;break;case n:this.topRow_=u-1,this.mode_=\"rollUp\";break;case o:this.topRow_=u-2,this.mode_=\"rollUp\";break;case p:this.topRow_=u-3,this.mode_=\"rollUp\";break;case q:this.flushDisplayed(a.pts),this.shiftRowsUp_(),this.startPts_=a.pts;break;case r:\"popOn\"===this.mode_?this.nonDisplayed_[u]=this.nonDisplayed_[u].slice(0,-1):this.displayed_[u]=this.displayed_[u].slice(0,-1);break;case s:this.flushDisplayed(a.pts),this.displayed_=v();break;case t:this.nonDisplayed_=v();break;default:if(d=b>>>8,e=255&b,d>=16&&23>=d&&e>=64&&127>=e&&(16!==d||96>e)&&(d=e=32),16===(240&d))return;this[this.mode_](a.pts,d,e)}}};w.prototype=new b.utils.Stream,w.prototype.flushDisplayed=function(a){var b,c;for(c=0;c<this.displayed_.length;c++)b=this.displayed_[c],b.length&&this.trigger(\"data\",{startPts:this.startPts_,endPts:a,text:b})},w.prototype.popOn=function(a,b,c){var d=this.nonDisplayed_[u];b=j[b]||b,d+=String.fromCharCode(b),c=j[c]||c,d+=String.fromCharCode(c),this.nonDisplayed_[u]=d},w.prototype.rollUp=function(a,b,c){var d=this.displayed_[u];\"\"===d&&(this.flushDisplayed(a),this.startPts_=a),b=j[b]||b,d+=String.fromCharCode(b),c=j[c]||c,d+=String.fromCharCode(c),this.displayed_[u]=d},w.prototype.shiftRowsUp_=function(){var a;for(a=0;a<this.topRow_;a++)this.displayed_[a]=\"\";for(a=this.topRow_;u>a;a++)this.displayed_[a]=this.displayed_[a+1];this.displayed_[u]=\"\"},b.mp2t=b.mp2t||{},b.mp2t.CaptionStream=i,b.mp2t.Cea608Stream=w}(this,this.muxjs),function(a,b,c){\"use strict\";var d,e=function(a,b,c){var d,e=\"\";for(d=b;c>d;d++)e+=\"%\"+(\"00\"+a[d].toString(16)).slice(-2);return e},f=function(b,c,d){return a.decodeURIComponent(e(b,c,d))},g=function(b,c,d){return a.unescape(e(b,c,d))},h=function(a){return a[0]<<21|a[1]<<14|a[2]<<7|a[3]},i={TXXX:function(a){var b;if(3===a.data[0]){for(b=1;b<a.data.length;b++)if(0===a.data[b]){a.description=f(a.data,1,b),a.value=f(a.data,b+1,a.data.length-1);break}a.data=a.value}},WXXX:function(a){var b;if(3===a.data[0])for(b=1;b<a.data.length;b++)if(0===a.data[b]){a.description=f(a.data,1,b),a.url=f(a.data,b+1,a.data.length);break}},PRIV:function(a){var b;for(b=0;b<a.data.length;b++)if(0===a.data[b]){a.owner=g(a.data,0,b);break}a.privateData=a.data.subarray(b+1),a.data=a.privateData}};d=function(a){var c,e={debug:!(!a||!a.debug),descriptor:a&&a.descriptor},f=0,g=[],j=0;if(d.prototype.init.call(this),this.dispatchType=b.mp2t.METADATA_STREAM_TYPE.toString(16),e.descriptor)for(c=0;c<e.descriptor.length;c++)this.dispatchType+=(\"00\"+e.descriptor[c].toString(16)).slice(-2);this.push=function(a){var b,c,d,k,l;if(\"timed-metadata\"===a.type){if(a.dataAlignmentIndicator&&(j=0,g.length=0),0===g.length&&(a.data.length<10||a.data[0]!==\"I\".charCodeAt(0)||a.data[1]!==\"D\".charCodeAt(0)||a.data[2]!==\"3\".charCodeAt(0)))return void(e.debug&&console.log(\"Skipping unrecognized metadata packet\"));if(g.push(a),j+=a.data.byteLength,1===g.length&&(f=h(a.data.subarray(6,10)),f+=10),!(f>j)){for(b={data:new Uint8Array(f),frames:[],pts:g[0].pts,dts:g[0].dts},l=0;f>l;)b.data.set(g[0].data.subarray(0,f-l),l),l+=g[0].data.byteLength,j-=g[0].data.byteLength,g.shift();c=10,64&b.data[5]&&(c+=4,c+=h(b.data.subarray(10,14)),f-=h(b.data.subarray(16,20)));do{if(d=h(b.data.subarray(c+4,c+8)),1>d)return console.log(\"Malformed ID3 frame encountered. Skipping metadata parsing.\");k={id:String.fromCharCode(b.data[c],b.data[c+1],b.data[c+2],b.data[c+3]),data:b.data.subarray(c+10,c+d+10)},k.key=k.id,i[k.id]&&i[k.id](k),b.frames.push(k),c+=10,c+=d}while(f>c);this.trigger(\"data\",b)}}}},d.prototype=new b.utils.Stream,b.mp2t=b.mp2t||{},b.mp2t.MetadataStream=d}(this,this.muxjs),function(a,b,c){\"use strict\";var d,e,f,g,h,i,j,k=b.mp4;e=function(a){var b=[],c=0,d=0,f=0;e.prototype.init.call(this),this.push=function(d){h(a,d),a&&(a.audioobjecttype=d.audioobjecttype,a.channelcount=d.channelcount,a.samplerate=d.samplerate,a.samplingfrequencyindex=d.samplingfrequencyindex,a.samplesize=d.samplesize),b.push(d),c+=d.data.byteLength},this.setEarliestDts=function(b){f=b-a.timelineStartInfo.baseMediaDecodeTime},this.flush=function(){var e,g,h,l,m,n,o;if(0===c)return void this.trigger(\"done\");for(a.minSegmentDts<f&&(a.minSegmentDts=1/0,b=b.filter(function(b){return b.dts>=f?(a.minSegmentDts=Math.min(a.minSegmentDts,b.dts),a.minSegmentPts=a.minSegmentDts,!0):(c-=b.data.byteLength,!1)})),h=new Uint8Array(c),a.samples=[],m=0;b.length;)g=b[0],l={size:g.data.byteLength,duration:1024},a.samples.push(l),h.set(g.data,m),m+=g.data.byteLength,b.shift();c=0,n=k.mdat(h),j(a),o=k.moof(d,[a]),e=new Uint8Array(o.byteLength+n.byteLength),d++,e.set(o),e.set(n,o.byteLength),i(a),this.trigger(\"data\",{track:a,boxes:e}),this.trigger(\"done\")}},e.prototype=new b.utils.Stream,d=function(a){var b,e,f=0,g=[],l=0;d.prototype.init.call(this),delete a.minPTS,this.push=function(c){h(a,c),\"seq_parameter_set_rbsp\"!==c.nalUnitType||b||(b=c.config,a.width=b.width,a.height=b.height,a.sps=[c.data],a.profileIdc=b.profileIdc,a.levelIdc=b.levelIdc,a.profileCompatibility=b.profileCompatibility),\"pic_parameter_set_rbsp\"!==c.nalUnitType||e||(e=c.data,a.pps=[c.data]),g.push(c),l+=c.data.byteLength},this.flush=function(){for(var d,h,m,n,o,p,q,r,s,t;g.length&&\"access_unit_delimiter_rbsp\"!==g[0].nalUnitType;)g.shift();if(0===l)return void this.trigger(\"done\");for(q=new Uint8Array(l+4*g.length),r=new DataView(q.buffer),a.samples=[],s={size:0,flags:{isLeading:0,dependsOn:1,isDependedOn:0,hasRedundancy:0,degradationPriority:0}},p=0;g.length;)h=g[0],\"access_unit_delimiter_rbsp\"===h.nalUnitType&&(d&&(s.duration=h.dts-d.dts,a.samples.push(s)),s={size:0,flags:{isLeading:0,dependsOn:1,isDependedOn:0,hasRedundancy:0,degradationPriority:0},dataOffset:p,compositionTimeOffset:h.pts-h.dts},d=h),\"slice_layer_without_partitioning_rbsp_idr\"===h.nalUnitType&&(s.flags.dependsOn=2),s.size+=4,s.size+=h.data.byteLength,r.setUint32(p,h.data.byteLength),p+=4,q.set(h.data,p),p+=h.data.byteLength,g.shift();for(a.samples.length&&(s.duration=a.samples[a.samples.length-1].duration),a.samples.push(s),t=0;a.samples.length;){if(s=a.samples[0],2===s.flags.dependsOn){q=q.subarray(s.dataOffset),s.duration+=t;break}t+=s.duration,a.samples.shift()}l=0,n=k.mdat(q),j(a),this.trigger(\"timelineStartInfo\",a.timelineStartInfo),m=k.moof(f,[a]),o=new Uint8Array(m.byteLength+n.byteLength),f++,o.set(m),o.set(n,m.byteLength),i(a),this.trigger(\"data\",{track:a,boxes:o}),b=c,e=c,this.trigger(\"done\")}},d.prototype=new b.utils.Stream,h=function(a,b){\"number\"==typeof b.pts&&(a.timelineStartInfo.pts===c&&(a.timelineStartInfo.pts=b.pts),a.minSegmentPts===c?a.minSegmentPts=b.pts:a.minSegmentPts=Math.min(a.minSegmentPts,b.pts),a.maxSegmentPts===c?a.maxSegmentPts=b.pts:a.maxSegmentPts=Math.max(a.maxSegmentPts,b.pts)),\"number\"==typeof b.dts&&(a.timelineStartInfo.dts===c&&(a.timelineStartInfo.dts=b.dts),a.minSegmentDts===c?a.minSegmentDts=b.dts:a.minSegmentDts=Math.min(a.minSegmentDts,b.dts),a.maxSegmentDts===c?a.maxSegmentDts=b.dts:a.maxSegmentDts=Math.max(a.maxSegmentDts,b.dts))},i=function(a){delete a.minSegmentDts,delete a.maxSegmentDts,delete a.minSegmentPts,delete a.maxSegmentPts},j=function(a){var b,c=9e4,d=a.minSegmentDts-a.timelineStartInfo.dts,e=a.minSegmentPts-a.minSegmentDts;a.baseMediaDecodeTime=a.timelineStartInfo.baseMediaDecodeTime,a.baseMediaDecodeTime+=d,a.baseMediaDecodeTime-=e,a.baseMediaDecodeTime=Math.max(0,a.baseMediaDecodeTime),\"audio\"===a.type&&(b=a.samplerate/c,a.baseMediaDecodeTime*=b,a.baseMediaDecodeTime=Math.floor(a.baseMediaDecodeTime))},g=function(a){this.numberOfTracks=0,this.metadataStream=a.metadataStream,\"undefined\"!=typeof a.remux?this.remuxTracks=!!a.remux:this.remuxTracks=!0,this.pendingTracks=[],this.videoTrack=null,this.pendingBoxes=[],this.pendingCaptions=[],this.pendingMetadata=[],this.pendingBytes=0,this.emittedTracks=0,g.prototype.init.call(this),this.push=function(a){return a.text?this.pendingCaptions.push(a):a.frames?this.pendingMetadata.push(a):(this.pendingTracks.push(a.track),this.pendingBoxes.push(a.boxes),this.pendingBytes+=a.boxes.byteLength,\"video\"===a.track.type&&(this.videoTrack=a.track),void(\"audio\"===a.track.type&&(this.audioTrack=a.track)))}},g.prototype=new b.utils.Stream,g.prototype.flush=function(){var a,c,d,e,f=0,g={captions:[],metadata:[]},h=0;if(!(0===this.pendingTracks.length||this.remuxTracks&&this.pendingTracks.length<this.numberOfTracks)){for(this.videoTrack?h=this.videoTrack.timelineStartInfo.pts:this.audioTrack&&(h=this.audioTrack.timelineStartInfo.pts),1===this.pendingTracks.length?g.type=this.pendingTracks[0].type:g.type=\"combined\",this.emittedTracks+=this.pendingTracks.length,d=b.mp4.initSegment(this.pendingTracks),g.data=new Uint8Array(d.byteLength+this.pendingBytes),g.data.set(d),f+=d.byteLength,e=0;e<this.pendingBoxes.length;e++)g.data.set(this.pendingBoxes[e],f),f+=this.pendingBoxes[e].byteLength;for(e=0;e<this.pendingCaptions.length;e++)a=this.pendingCaptions[e],a.startTime=a.startPts-h,a.startTime/=9e4,a.endTime=a.endPts-h,a.endTime/=9e4,g.captions.push(a);for(e=0;e<this.pendingMetadata.length;e++)c=this.pendingMetadata[e],c.cueTime=c.pts-h,c.cueTime/=9e4,g.metadata.push(c);g.metadata.dispatchType=this.metadataStream.dispatchType,this.pendingTracks.length=0,this.videoTrack=null,this.pendingBoxes.length=0,this.pendingCaptions.length=0,this.pendingBytes=0,this.pendingMetadata.length=0,this.trigger(\"data\",g),this.emittedTracks>=this.numberOfTracks&&(this.trigger(\"done\"),this.emittedTracks=0)}},f=function(a){var h,j,k,l,m,n,o,p,q,r,s,t=this;f.prototype.init.call(this),a=a||{},this.baseMediaDecodeTime=a.baseMediaDecodeTime||0,this.metadataStream=new b.mp2t.MetadataStream,a.metadataStream=this.metadataStream,k=new b.mp2t.TransportPacketStream,l=new b.mp2t.TransportParseStream,m=new b.mp2t.ElementaryStream,n=new b.codecs.AacStream,o=new b.codecs.H264Stream,s=new g(a),k.pipe(l).pipe(m),m.pipe(o),m.pipe(n),m.pipe(this.metadataStream).pipe(s),b.mp2t.CaptionStream&&(r=new b.mp2t.CaptionStream,o.pipe(r).pipe(s)),m.on(\"data\",function(a){var b;if(\"metadata\"===a.type){for(b=a.tracks.length;b--;)h||\"video\"!==a.tracks[b].type?j||\"audio\"!==a.tracks[b].type||(j=a.tracks[b],j.timelineStartInfo.baseMediaDecodeTime=t.baseMediaDecodeTime):(h=a.tracks[b],h.timelineStartInfo.baseMediaDecodeTime=t.baseMediaDecodeTime);h&&!p&&(s.numberOfTracks++,p=new d(h),p.on(\"timelineStartInfo\",function(a){j&&(j.timelineStartInfo=a,q.setEarliestDts(a.dts))}),o.pipe(p).pipe(s)),j&&!q&&(s.numberOfTracks++,q=new e(j),n.pipe(q).pipe(s))}}),this.setBaseMediaDecodeTime=function(a){this.baseMediaDecodeTime=a,j&&(j.timelineStartInfo.dts=c,j.timelineStartInfo.pts=c,i(j),j.timelineStartInfo.baseMediaDecodeTime=a),h&&(h.timelineStartInfo.dts=c,h.timelineStartInfo.pts=c,i(h),h.timelineStartInfo.baseMediaDecodeTime=a)},this.push=function(a){k.push(a)},this.flush=function(){k.flush()},s.on(\"data\",function(a){t.trigger(\"data\",a)}),s.on(\"done\",function(){t.trigger(\"done\")})},f.prototype=new b.utils.Stream,b.mp4=b.mp4||{},b.mp4.VideoSegmentStream=d,b.mp4.AudioSegmentStream=e,b.mp4.Transmuxer=f}(this,this.muxjs);var wireTransmuxerEvents=function(a){a.on(\"data\",function(a){a.data=a.data.buffer,postMessage({action:\"data\",segment:a},[a.data])}),a.captionStream&&a.captionStream.on(\"data\",function(a){postMessage({action:\"caption\",data:a})}),a.on(\"done\",function(a){postMessage({action:\"done\"})})},messageHandlers={init:function(a){initOptions=a&&a.options||{},this.defaultInit()},defaultInit:function(){transmuxer&&transmuxer.dispose(),transmuxer=new muxjs.mp4.Transmuxer(initOptions),wireTransmuxerEvents(transmuxer)},push:function(a){var b=new Uint8Array(a.data);transmuxer.push(b)},reset:function(){this.defaultInit()},setTimestampOffset:function(a){var b=a.timestampOffset||0;transmuxer.setBaseMediaDecodeTime(Math.round(9e4*b))},flush:function(a){transmuxer.flush()}};onmessage=function(a){transmuxer||\"init\"===a.data.action||messageHandlers.defaultInit(),a.data&&a.data.action&&messageHandlers[a.data.action]&&messageHandlers[a.data.action](a.data)};"], {type: "application/javascript"})));
this.transmuxer_.postMessage({action:'init', options: {remux: false}});
this.transmuxer_.onmessage = function (event) {
if (event.data.action === 'data') {
return self.data_(event);
}
if (event.data.action === 'done') {
return self.done_(event);
}
};
// this timestampOffset is a property with the side-effect of resetting
// baseMediaDecodeTime in the transmuxer on the setter
Object.defineProperty(this, 'timestampOffset', {
get: function() {
return this.timestampOffset_;
},
set: function(val) {
if (typeof val === 'number' && val >= 0) {
this.timestampOffset_ = val;
// We have to tell the transmuxer to set the baseMediaDecodeTime to
// the desired timestampOffset for the next segment
this.transmuxer_.postMessage({
action: 'setTimestampOffset',
timestampOffset: val
});
}
}
});
// setting the append window affects both source buffers
Object.defineProperty(this, 'appendWindowStart', {
get: function() {
return (this.videoBuffer_ || this.audioBuffer_).appendWindowStart;
},
set: function(start) {
if (this.videoBuffer_) {
this.videoBuffer_.appendWindowStart = start;
}
if (this.audioBuffer_) {
this.audioBuffer_.appendWindowStart = start;
}
}
});
// this buffer is "updating" if either of its native buffers are
Object.defineProperty(this, 'updating', {
get: function() {
return this.bufferUpdating_ ||
(this.audioBuffer_ && this.audioBuffer_.updating) ||
(this.videoBuffer_ && this.videoBuffer_.updating);
}
});
// the buffered property is the intersection of the buffered
// ranges of the native source buffers
Object.defineProperty(this, 'buffered', {
get: function() {
var
start = null,
end = null,
arity = 0,
extents = [],
ranges = [];
// Handle the case where there is no buffer data
if ((!this.videoBuffer_ || this.videoBuffer_.buffered.length === 0) &&
(!this.audioBuffer_ || this.audioBuffer_.buffered.length === 0)) {
return videojs.createTimeRange();
}
// Handle the case where we only have one buffer
if (!this.videoBuffer_) {
return this.audioBuffer_.buffered;
} else if (!this.audioBuffer_) {
return this.videoBuffer_.buffered;
}
// Handle the case where we have both buffers and create an
// intersection of the two
var videoIndex = 0, audioIndex = 0;
var videoBuffered = this.videoBuffer_.buffered;
var audioBuffered = this.audioBuffer_.buffered;
var count = videoBuffered.length;
// A) Gather up all start and end times
while (count--) {
extents.push({time: videoBuffered.start(count), type: 'start'});
extents.push({time: videoBuffered.end(count), type: 'end'});
}
count = audioBuffered.length;
while (count--) {
extents.push({time: audioBuffered.start(count), type: 'start'});
extents.push({time: audioBuffered.end(count), type: 'end'});
}
// B) Sort them by time
extents.sort(function(a, b){return a.time - b.time;});
// C) Go along one by one incrementing arity for start and decrementing
// arity for ends
for(count = 0; count < extents.length; count++) {
if (extents[count].type === 'start') {
arity++;
// D) If arity is ever incremented to 2 we are entering an
// overlapping range
if (arity === 2) {
start = extents[count].time;
}
} else if (extents[count].type === 'end') {
arity--;
// E) If arity is ever decremented to 1 we leaving an
// overlapping range
if (arity === 1) {
end = extents[count].time;
}
}
// F) Record overlapping ranges
if (start !== null && end !== null) {
ranges.push([start, end]);
start = null;
end = null;
}
}
return videojs.createTimeRanges(ranges);
}
});
},
// Transmuxer message handlers
data_: function(event) {
var
segment = event.data.segment,
nativeMediaSource = this.mediaSource_.mediaSource_;
// Cast to type
segment.data = new Uint8Array(segment.data);
// If any sourceBuffers have not been created, do so now
if (segment.type === 'video') {
if (!this.videoBuffer_) {
this.videoBuffer_ = nativeMediaSource.addSourceBuffer('video/mp4;codecs="' + this.codecs_[0] + '"');
// aggregate buffer events
this.videoBuffer_.addEventListener('updatestart',
aggregateUpdateHandler(this, 'audioBuffer_', 'updatestart'));
this.videoBuffer_.addEventListener('update',
aggregateUpdateHandler(this, 'audioBuffer_', 'update'));
this.videoBuffer_.addEventListener('updateend',
aggregateUpdateHandler(this, 'audioBuffer_', 'updateend'));
}
} else if (segment.type === 'audio') {
if (!this.audioBuffer_) {
this.audioBuffer_ = nativeMediaSource.addSourceBuffer('audio/mp4;codecs="' + this.codecs_[1] + '"');
// aggregate buffer events
this.audioBuffer_.addEventListener('updatestart',
aggregateUpdateHandler(this, 'videoBuffer_', 'updatestart'));
this.audioBuffer_.addEventListener('update',
aggregateUpdateHandler(this, 'videoBuffer_', 'update'));
this.audioBuffer_.addEventListener('updateend',
aggregateUpdateHandler(this, 'videoBuffer_', 'updateend'));
}
} else if (segment.type === 'combined') {
if (!this.videoBuffer_) {
this.videoBuffer_ = nativeMediaSource.addSourceBuffer('video/mp4;codecs="' + this.codecs_.join(',') + '"');
// aggregate buffer events
this.videoBuffer_.addEventListener('updatestart',
aggregateUpdateHandler(this, 'videoBuffer_', 'updatestart'));
this.videoBuffer_.addEventListener('update',
aggregateUpdateHandler(this, 'videoBuffer_', 'update'));
this.videoBuffer_.addEventListener('updateend',
aggregateUpdateHandler(this, 'videoBuffer_', 'updateend'));
}
}
createTextTracksIfNecessary(this, this.mediaSource_, segment);
// Add the segments to the pendingBuffers array
this.pendingBuffers_.push(segment);
return;
},
done_: function() {
// All buffers should have been flushed from the muxer
// start processing anything we have received
this.processPendingSegments_();
return;
},
// SourceBuffer Implementation
appendBuffer: function(segment) {
// Start the internal "updating" state
this.bufferUpdating_ = true;
this.transmuxer_.postMessage({action: 'push', data: segment.buffer}, [segment.buffer]);
this.transmuxer_.postMessage({action: 'flush'});
},
remove: function(start, end) {
if (this.videoBuffer_) {
this.videoBuffer_.remove(start, end);
}
if (this.audioBuffer_) {
this.audioBuffer_.remove(start, end);
}
// Remove Metadata Cues (id3)
removeCuesFromTrack(start, end, this.metadataTrack_);
// Remove Any Captions
removeCuesFromTrack(start, end, this.inbandTextTrack_);
},
/**
* Process any segments that the muxer has output
* Concatenate segments together based on type and append them into
* their respective sourceBuffers
*/
processPendingSegments_: function() {
var sortedSegments = {
video: {
segments: [],
bytes: 0
},
audio: {
segments: [],
bytes: 0
},
captions: [],
metadata: []
};
// Sort segments into separate video/audio arrays and
// keep track of their total byte lengths
sortedSegments = this.pendingBuffers_.reduce(function (segmentObj, segment) {
var
type = segment.type,
data = segment.data;
// A "combined" segment type (unified video/audio) uses the videoBuffer
if (type === 'combined') {
type = 'video';
}
segmentObj[type].segments.push(data);
segmentObj[type].bytes += data.byteLength;
// Gather any captions into a single array
if (segment.captions) {
segmentObj.captions = segmentObj.captions.concat(segment.captions);
}
// Gather any metadata into a single array
if (segment.metadata) {
segmentObj.metadata = segmentObj.metadata.concat(segment.metadata);
}
return segmentObj;
}, sortedSegments);
addTextTrackData(this, sortedSegments.captions, sortedSegments.metadata);
// Merge multiple video and audio segments into one and append
this.concatAndAppendSegments_(sortedSegments.video, this.videoBuffer_);
this.concatAndAppendSegments_(sortedSegments.audio, this.audioBuffer_);
this.pendingBuffers_.length = 0;
// We are no longer in the internal "updating" state
this.bufferUpdating_ = false;
},
/**
* Combind all segments into a single Uint8Array and then append them
* to the destination buffer
*/
concatAndAppendSegments_: function(segmentObj, destinationBuffer) {
var
offset = 0,
tempBuffer;
if (segmentObj.bytes) {
tempBuffer = new Uint8Array(segmentObj.bytes);
// Combine the individual segments into one large typed-array
segmentObj.segments.forEach(function (segment) {
tempBuffer.set(segment, offset);
offset += segment.byteLength;
});
destinationBuffer.appendBuffer(tempBuffer);
}
},
// abort any sourceBuffer actions and throw out any un-appended data
abort: function() {
if (this.videoBuffer_) {
this.videoBuffer_.abort();
}
if (this.audioBuffer_) {
this.audioBuffer_.abort();
}
if (this.transmuxer_) {
this.transmuxer_.postMessage({action: 'reset'});
}
this.pendingBuffers_.length = 0;
this.bufferUpdating_ = false;
}
});
// -----
// Flash
// -----
videojs.FlashMediaSource = videojs.extend(EventTarget, {
constructor: function(){
var self = this;
this.sourceBuffers = [];
this.readyState = 'closed';
this.on(['sourceopen', 'webkitsourceopen'], function(event){
// find the swf where we will push media data
this.swfObj = document.getElementById(event.swfId);
this.player_ = videojs(this.swfObj.parentNode);
this.tech_ = this.swfObj.tech;
this.readyState = 'open';
this.tech_.on('seeking', function() {
var i = self.sourceBuffers.length;
while (i--) {
self.sourceBuffers[i].abort();
}
});
// trigger load events
if (this.swfObj) {
this.swfObj.vjs_load();
}
});
},
addSeekableRange_: function() {
// intentional no-op
}
});
/**
* The maximum size in bytes for append operations to the video.js
* SWF. Calling through to Flash blocks and can be expensive so
* tuning this parameter may improve playback on slower
* systems. There are two factors to consider:
* - Each interaction with the SWF must be quick or you risk dropping
* video frames. To maintain 60fps for the rest of the page, each append
* must not take longer than 16ms. Given the likelihood that the page
* will be executing more javascript than just playback, you probably
* want to aim for less than 8ms. We aim for just 4ms.
* - Bigger appends significantly increase throughput. The total number of
* bytes over time delivered to the SWF must exceed the video bitrate or
* playback will stall.
*
* We adaptively tune the size of appends to give the best throughput
* possible given the performance of the system. To do that we try to append
* as much as possible in TIME_PER_TICK and while tuning the size of appends
* dynamically so that we only append about 4-times in that 4ms span.
*
* The reason we try to keep the number of appends around four is due to
* externalities such as Flash load and garbage collection that are highly
* variable and having 4 iterations allows us to exit the loop early if
* an iteration takes longer than expected.
*/
videojs.FlashMediaSource.TIME_BETWEEN_TICKS = Math.floor(1000 / 480);
videojs.FlashMediaSource.TIME_PER_TICK = Math.floor(1000 / 240);
videojs.FlashMediaSource.BYTES_PER_CHUNK = 1 * 1024; // 1kb
videojs.FlashMediaSource.MIN_CHUNK = 1024;
videojs.FlashMediaSource.MAX_CHUNK = 1024 * 1024;
// create a new source buffer to receive a type of media data
videojs.FlashMediaSource.prototype.addSourceBuffer = function(type){
var sourceBuffer;
// if this is an FLV type, we'll push data to flash
if (type.indexOf('video/mp2t') === 0) {
// Flash source buffers
sourceBuffer = new videojs.FlashSourceBuffer(this);
} else {
throw new Error('NotSupportedError (Video.js)');
}
this.sourceBuffers.push(sourceBuffer);
return sourceBuffer;
};
/**
* Set or return the presentation duration.
* @param value {double} the duration of the media in seconds
* @param {double} the current presentation duration
* @see http://www.w3.org/TR/media-source/#widl-MediaSource-duration
*/
try {
Object.defineProperty(videojs.FlashMediaSource.prototype, 'duration', {
get: function(){
if (!this.swfObj) {
return NaN;
}
// get the current duration from the SWF
return this.swfObj.vjs_getProperty('duration');
},
set: function(value){
var
i,
oldDuration = this.swfObj.vjs_getProperty('duration');
this.swfObj.vjs_setProperty('duration', value);
if (value < oldDuration) {
// In MSE, this triggers the range removal algorithm which causes
// an update to occur
for (i = 0; i < this.sourceBuffers.length; i++) {
this.sourceBuffers[i].remove(value, oldDuration);
}
}
return value;
}
});
} catch (e) {
// IE8 throws if defineProperty is called on a non-DOM node. We
// don't support IE8 but we shouldn't throw an error if loaded
// there.
videojs.FlashMediaSource.prototype.duration = NaN;
}
/**
* Signals the end of the stream.
* @param error {string} (optional) Signals that a playback error
* has occurred. If specified, it must be either "network" or
* "decode".
* @see https://w3c.github.io/media-source/#widl-MediaSource-endOfStream-void-EndOfStreamError-error
*/
videojs.FlashMediaSource.prototype.endOfStream = function(error){
if (error === 'network') {
// MEDIA_ERR_NETWORK
this.tech_.error(2);
} else if (error === 'decode') {
// MEDIA_ERR_DECODE
this.tech_.error(3);
}
if (this.readyState !== 'ended') {
this.readyState = 'ended';
this.swfObj.vjs_endOfStream();
}
};
// store references to the media sources so they can be connected
// to a video element (a swf object)
videojs.mediaSources = {};
// provide a method for a swf object to notify JS that a media source is now open
videojs.MediaSource.open = function(msObjectURL, swfId){
var mediaSource = videojs.mediaSources[msObjectURL];
if (mediaSource) {
mediaSource.trigger({
type: 'sourceopen',
swfId: swfId
});
} else {
throw new Error('Media Source not found (Video.js)');
}
};
scheduleTick = function(func) {
// Chrome doesn't invoke requestAnimationFrame callbacks
// in background tabs, so use setTimeout.
window.setTimeout(func, videojs.FlashMediaSource.TIME_BETWEEN_TICKS);
};
// Source Buffer
videojs.FlashSourceBuffer = videojs.extend(EventTarget, {
constructor: function(mediaSource){
var
encodedHeader,
self = this;
// Start off using the globally defined value but refine
// as we append data into flash
this.chunkSize_ = videojs.FlashMediaSource.BYTES_PER_CHUNK;
// byte arrays queued to be appended
this.buffer_ = [];
// the total number of queued bytes
this.bufferSize_ = 0;
// to be able to determine the correct position to seek to, we
// need to retain information about the mapping between the
// media timeline and PTS values
this.basePtsOffset_ = NaN;
this.mediaSource = mediaSource;
// indicates whether the asynchronous continuation of an operation
// is still being processed
// see https://w3c.github.io/media-source/#widl-SourceBuffer-updating
this.updating = false;
this.timestampOffset_ = 0;
// TS to FLV transmuxer
this.segmentParser_ = new muxjs.flv.Transmuxer();
this.segmentParser_.on('data', this.receiveBuffer_.bind(this));
encodedHeader = window.btoa(String.fromCharCode.apply(null, Array.prototype.slice.call(this.segmentParser_.getFlvHeader())));
this.mediaSource.swfObj.vjs_appendBuffer(encodedHeader);
Object.defineProperty(this, 'timestampOffset', {
get: function() {
return this.timestampOffset_;
},
set: function(val) {
if (typeof val === 'number' && val >= 0) {
this.timestampOffset_ = val;
this.segmentParser_ = new muxjs.flv.Transmuxer();
this.segmentParser_.on('data', this.receiveBuffer_.bind(this));
// We have to tell flash to expect a discontinuity
this.mediaSource.swfObj.vjs_discontinuity();
// the media <-> PTS mapping must be re-established after
// the discontinuity
this.basePtsOffset_ = NaN;
}
}
});
Object.defineProperty(this, 'buffered', {
get: function() {
return videojs.createTimeRanges(this.mediaSource.swfObj.vjs_getProperty('buffered'));
}
});
// On a seek we remove all text track data since flash has no concept
// of a buffered-range and everything else is reset on seek
this.mediaSource.player_.on('seeked', function() {
removeCuesFromTrack(0, Infinity, self.metadataTrack_);
removeCuesFromTrack(0, Infinity, self.inbandTextTrack_);
});
},
// accept video data and pass to the video (swf) object
appendBuffer: function(bytes){
var error, self = this;
if (this.updating) {
error = new Error('SourceBuffer.append() cannot be called ' +
'while an update is in progress');
error.name = 'InvalidStateError';
error.code = 11;
throw error;
}
this.updating = true;
this.mediaSource.readyState = 'open';
this.trigger({ type: 'update' });
var chunk = 512 * 1024;
var i = 0;
(function chunkInData() {
self.segmentParser_.push(bytes.subarray(i, i + chunk));
i += chunk;
if (i < bytes.byteLength) {
scheduleTick(chunkInData);
} else {
scheduleTick(self.segmentParser_.flush.bind(self.segmentParser_));
}
})();
},
// reset the parser and remove any data queued to be sent to the swf
abort: function() {
this.buffer_ = [];
this.bufferSize_ = 0;
this.mediaSource.swfObj.vjs_abort();
// report any outstanding updates have ended
if (this.updating) {
this.updating = false;
this.trigger({ type: 'updateend' });
}
},
// Flash cannot remove ranges already buffered in the NetStream
// but seeking clears the buffer entirely. For most purposes,
// having this operation act as a no-op is acceptable.
remove: function(start, end) {
removeCuesFromTrack(start, end, this.metadataTrack_);
removeCuesFromTrack(start, end, this.inbandTextTrack_);
this.trigger({ type: 'update' });
this.trigger({ type: 'updateend' });
},
receiveBuffer_: function(segment) {
var self = this;
// create an in-band caption track if one is present in the segment
createTextTracksIfNecessary(this, this.mediaSource, segment);
addTextTrackData(this, segment.captions, segment.metadata);
// Do this asynchronously since convertTagsToData_ can be time consuming
scheduleTick(function() {
if (self.buffer_.length === 0) {
scheduleTick(self.processBuffer_.bind(self));
}
var flvBytes = self.convertTagsToData_(segment);
if (flvBytes) {
self.buffer_.push(flvBytes);
self.bufferSize_ += flvBytes.byteLength;
}
});
},
// append a portion of the current buffer to the SWF
processBuffer_: function() {
var
chunk,
i,
length,
binary,
b64str,
startByte = 0,
appendIterations = 0,
startTime = +(new Date()),
appendTime;
if (!this.buffer_.length) {
if (this.updating !== false) {
this.updating = false;
this.trigger({ type: 'updateend' });
}
// do nothing if the buffer is empty
return;
}
do {
appendIterations++;
// concatenate appends up to the max append size
chunk = this.buffer_[0].subarray(startByte, startByte + this.chunkSize_);
// requeue any bytes that won't make it this round
if (chunk.byteLength < this.chunkSize_ ||
this.buffer_[0].byteLength === startByte + this.chunkSize_) {
startByte = 0;
this.buffer_.shift();
} else {
startByte += this.chunkSize_;
}
this.bufferSize_ -= chunk.byteLength;
// base64 encode the bytes
binary = '';
length = chunk.byteLength;
for (i = 0; i < length; i++) {
binary += String.fromCharCode(chunk[i]);
}
b64str = window.btoa(binary);
// bypass normal ExternalInterface calls and pass xml directly
// IE can be slow by default
this.mediaSource.swfObj.CallFunction('<invoke name="vjs_appendBuffer"' +
'returntype="javascript"><arguments><string>' +
b64str +
'</string></arguments></invoke>');
appendTime = (new Date()) - startTime;
} while (this.buffer_.length &&
appendTime < videojs.FlashMediaSource.TIME_PER_TICK);
if (this.buffer_.length && startByte) {
this.buffer_[0] = this.buffer_[0].subarray(startByte);
}
if (appendTime >= videojs.FlashMediaSource.TIME_PER_TICK) {
// We want to target 4 iterations per time-slot so that gives us
// room to adjust to changes in Flash load and other externalities
// such as garbage collection while still maximizing throughput
this.chunkSize_ = Math.floor(this.chunkSize_ * (appendIterations / 4));
}
// We also make sure that the chunk-size doesn't drop below 1KB or
// go above 1MB as a sanity check
this.chunkSize_ = Math.max(
videojs.FlashMediaSource.MIN_CHUNK,
Math.min(this.chunkSize_, videojs.FlashMediaSource.MAX_CHUNK));
// schedule another append if necessary
if (this.bufferSize_ !== 0) {
scheduleTick(this.processBuffer_.bind(this));
} else {
this.updating = false;
this.trigger({ type: 'updateend' });
}
},
// Turns an array of flv tags into a Uint8Array representing the
// flv data. Also removes any tags that are before the current
// time so that playback begins at or slightly after the right
// place on a seek
convertTagsToData_: function (segmentData) {
var
segmentByteLength = 0,
tech = this.mediaSource.tech_,
targetPts = 0,
i, j, segment,
filteredTags = [],
tags = this.getOrderedTags_(segmentData);
// Establish the media timeline to PTS translation if we don't
// have one already
if (isNaN(this.basePtsOffset_) && tags.length) {
this.basePtsOffset_ = tags[0].pts;
}
// Trim any tags that are before the end of the end of
// the current buffer
if (tech.buffered().length) {
targetPts = tech.buffered().end(0) - this.timestampOffset;
}
// Trim to currentTime if it's ahead of buffered or buffered doesn't exist
targetPts = Math.max(targetPts, tech.currentTime() - this.timestampOffset);
targetPts *= 1e3; // PTS values are represented in milliseconds
targetPts += this.basePtsOffset_;
// skip tags with a presentation time less than the seek target
for (i = 0; i < tags.length; i++) {
if (tags[i].pts >= targetPts) {
filteredTags.push(tags[i]);
}
}
if (filteredTags.length === 0) {
return;
}
// concatenate the bytes into a single segment
for (i = 0; i < filteredTags.length; i++) {
segmentByteLength += filteredTags[i].bytes.byteLength;
}
segment = new Uint8Array(segmentByteLength);
for (i = 0, j = 0; i < filteredTags.length; i++) {
segment.set(filteredTags[i].bytes, j);
j += filteredTags[i].bytes.byteLength;
}
return segment;
},
// assemble the FLV tags in decoder order
getOrderedTags_: function(segmentData) {
var
videoTags = segmentData.tags.videoTags,
audioTags = segmentData.tags.audioTags,
tag,
tags = [];
while (videoTags.length || audioTags.length) {
if (!videoTags.length) {
// only audio tags remain
tag = audioTags.shift();
} else if (!audioTags.length) {
// only video tags remain
tag = videoTags.shift();
} else if (audioTags[0].dts < videoTags[0].dts) {
// audio should be decoded next
tag = audioTags.shift();
} else {
// video should be decoded next
tag = videoTags.shift();
}
tags.push(tag.finalize());
}
return tags;
}
});
// URL
videojs.URL = {
createObjectURL: function(object){
var url;
// use the native MediaSource to generate an object URL
if (object instanceof videojs.HtmlMediaSource) {
url = window.URL.createObjectURL(object.mediaSource_);
object.url_ = url;
return url;
}
// if the object isn't an emulated MediaSource, delegate to the
// native implementation
if (!(object instanceof videojs.FlashMediaSource)) {
url = window.URL.createObjectURL(object);
object.url_ = url;
return url;
}
// build a URL that can be used to map back to the emulated
// MediaSource
url = objectUrlPrefix + urlCount;
urlCount++;
// setup the mapping back to object
videojs.mediaSources[url] = object;
return url;
}
};
})(this, this.muxjs);