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Owen Quinlan 2021-07-02 19:29:34 +10:00
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/**
* mux.js
*
* Copyright (c) Brightcove
* Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
*
* 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.
*/
'use strict';
var Stream = require('../utils/stream.js'),
CaptionStream = require('./caption-stream'),
StreamTypes = require('./stream-types'),
TimestampRolloverStream = require('./timestamp-rollover-stream').TimestampRolloverStream; // object types
var _TransportPacketStream, _TransportParseStream, _ElementaryStream; // constants
var MP2T_PACKET_LENGTH = 188,
// bytes
SYNC_BYTE = 0x47;
/**
* Splits an incoming stream of binary data into MPEG-2 Transport
* Stream packets.
*/
_TransportPacketStream = function TransportPacketStream() {
var buffer = new Uint8Array(MP2T_PACKET_LENGTH),
bytesInBuffer = 0;
_TransportPacketStream.prototype.init.call(this); // Deliver new bytes to the stream.
/**
* Split a stream of data into M2TS packets
**/
this.push = function (bytes) {
var 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;
}
};
/**
* Passes identified M2TS packets to the TransportParseStream to be parsed
**/
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');
};
this.endTimeline = function () {
this.flush();
this.trigger('endedtimeline');
};
this.reset = function () {
bytesInBuffer = 0;
this.trigger('reset');
};
};
_TransportPacketStream.prototype = new Stream();
/**
* Accepts an MP2T TransportPacketStream and emits data events with parsed
* forms of the individual transport stream packets.
*/
_TransportParseStream = function TransportParseStream() {
var parsePsi, parsePat, parsePmt, self;
_TransportParseStream.prototype.init.call(this);
self = this;
this.packetsWaitingForPmt = [];
this.programMapTable = undefined;
parsePsi = function parsePsi(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 parsePat(payload, pat) {
pat.section_number = payload[7]; // eslint-disable-line camelcase
pat.last_section_number = payload[8]; // eslint-disable-line camelcase
// 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 parsePmt(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 = {
video: null,
audio: null,
'timed-metadata': {}
}; // 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) {
var streamType = payload[offset];
var pid = (payload[offset + 1] & 0x1F) << 8 | payload[offset + 2]; // only map a single elementary_pid for audio and video stream types
// TODO: should this be done for metadata too? for now maintain behavior of
// multiple metadata streams
if (streamType === StreamTypes.H264_STREAM_TYPE && self.programMapTable.video === null) {
self.programMapTable.video = pid;
} else if (streamType === StreamTypes.ADTS_STREAM_TYPE && self.programMapTable.audio === null) {
self.programMapTable.audio = pid;
} else if (streamType === StreamTypes.METADATA_STREAM_TYPE) {
// map pid to stream type for metadata streams
self.programMapTable['timed-metadata'][pid] = streamType;
} // 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;
};
/**
* Deliver a new MP2T packet to the next stream in the pipeline.
*/
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); // if there are any packets waiting for a PMT to be found, process them now
while (this.packetsWaitingForPmt.length) {
this.processPes_.apply(this, this.packetsWaitingForPmt.shift());
}
} else if (this.programMapTable === undefined) {
// When we have not seen a PMT yet, defer further processing of
// PES packets until one has been parsed
this.packetsWaitingForPmt.push([packet, offset, result]);
} else {
this.processPes_(packet, offset, result);
}
};
this.processPes_ = function (packet, offset, result) {
// set the appropriate stream type
if (result.pid === this.programMapTable.video) {
result.streamType = StreamTypes.H264_STREAM_TYPE;
} else if (result.pid === this.programMapTable.audio) {
result.streamType = StreamTypes.ADTS_STREAM_TYPE;
} else {
// if not video or audio, it is timed-metadata or unknown
// if unknown, streamType will be undefined
result.streamType = this.programMapTable['timed-metadata'][result.pid];
}
result.type = 'pes';
result.data = packet.subarray(offset);
this.trigger('data', result);
};
};
_TransportParseStream.prototype = new 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 ElementaryStream() {
var self = this,
// PES packet fragments
video = {
data: [],
size: 0
},
audio = {
data: [],
size: 0
},
timedMetadata = {
data: [],
size: 0
},
programMapTable,
parsePes = function parsePes(payload, pes) {
var ptsDtsFlags;
var startPrefix = payload[0] << 16 | payload[1] << 8 | payload[2]; // default to an empty array
pes.data = new Uint8Array(); // In certain live streams, the start of a TS fragment has ts packets
// that are frame data that is continuing from the previous fragment. This
// is to check that the pes data is the start of a new pes payload
if (startPrefix !== 1) {
return;
} // get the packet length, this will be 0 for video
pes.packetLength = 6 + (payload[4] << 8 | payload[5]); // 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]);
},
/**
* Pass completely parsed PES packets to the next stream in the pipeline
**/
flushStream = function flushStream(stream, type, forceFlush) {
var packetData = new Uint8Array(stream.size),
event = {
type: type
},
i = 0,
offset = 0,
packetFlushable = false,
fragment; // do nothing if there is not enough buffered data for a complete
// PES header
if (!stream.data.length || stream.size < 9) {
return;
}
event.trackId = stream.data[0].pid; // reassemble the packet
for (i = 0; i < stream.data.length; i++) {
fragment = stream.data[i];
packetData.set(fragment.data, offset);
offset += fragment.data.byteLength;
} // parse assembled packet's PES header
parsePes(packetData, event); // non-video PES packets MUST have a non-zero PES_packet_length
// check that there is enough stream data to fill the packet
packetFlushable = type === 'video' || event.packetLength <= stream.size; // flush pending packets if the conditions are right
if (forceFlush || packetFlushable) {
stream.size = 0;
stream.data.length = 0;
} // only emit packets that are complete. this is to avoid assembling
// incomplete PES packets due to poor segmentation
if (packetFlushable) {
self.trigger('data', event);
}
};
_ElementaryStream.prototype.init.call(this);
/**
* Identifies M2TS packet types and parses PES packets using metadata
* parsed from the PMT
**/
this.push = function (data) {
({
pat: function pat() {// we have to wait for the PMT to arrive as well before we
// have any meaningful metadata
},
pes: function pes() {
var stream, streamType;
switch (data.streamType) {
case StreamTypes.H264_STREAM_TYPE:
stream = video;
streamType = 'video';
break;
case StreamTypes.ADTS_STREAM_TYPE:
stream = audio;
streamType = 'audio';
break;
case StreamTypes.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, true);
} // buffer this fragment until we are sure we've received the
// complete payload
stream.data.push(data);
stream.size += data.data.byteLength;
},
pmt: function pmt() {
var event = {
type: 'metadata',
tracks: []
};
programMapTable = data.programMapTable; // translate audio and video streams to tracks
if (programMapTable.video !== null) {
event.tracks.push({
timelineStartInfo: {
baseMediaDecodeTime: 0
},
id: +programMapTable.video,
codec: 'avc',
type: 'video'
});
}
if (programMapTable.audio !== null) {
event.tracks.push({
timelineStartInfo: {
baseMediaDecodeTime: 0
},
id: +programMapTable.audio,
codec: 'adts',
type: 'audio'
});
}
self.trigger('data', event);
}
})[data.type]();
};
this.reset = function () {
video.size = 0;
video.data.length = 0;
audio.size = 0;
audio.data.length = 0;
this.trigger('reset');
};
/**
* 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.flushStreams_ = function () {
// !!THIS ORDER IS IMPORTANT!!
// video first then audio
flushStream(video, 'video');
flushStream(audio, 'audio');
flushStream(timedMetadata, 'timed-metadata');
};
this.flush = function () {
this.flushStreams_();
this.trigger('done');
};
};
_ElementaryStream.prototype = new Stream();
var m2ts = {
PAT_PID: 0x0000,
MP2T_PACKET_LENGTH: MP2T_PACKET_LENGTH,
TransportPacketStream: _TransportPacketStream,
TransportParseStream: _TransportParseStream,
ElementaryStream: _ElementaryStream,
TimestampRolloverStream: TimestampRolloverStream,
CaptionStream: CaptionStream.CaptionStream,
Cea608Stream: CaptionStream.Cea608Stream,
Cea708Stream: CaptionStream.Cea708Stream,
MetadataStream: require('./metadata-stream')
};
for (var type in StreamTypes) {
if (StreamTypes.hasOwnProperty(type)) {
m2ts[type] = StreamTypes[type];
}
}
module.exports = m2ts;