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rtmp.coffee
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rtmp.coffee
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# RTMP/RTMPE/RTMPT/RTMPTE server
#
# RTMP specification is available at:
# http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/rtmp/pdf/rtmp_specification_1.0.pdf
net = require 'net'
url = require 'url'
crypto = require 'crypto'
Sequent = require 'sequent'
rtmp_handshake = require './rtmp_handshake'
codec_utils = require './codec_utils'
config = require './config'
h264 = require './h264'
aac = require './aac'
flv = require './flv'
avstreams = require './avstreams'
logger = require './logger'
Bits = require './bits'
# enum
SESSION_STATE_NEW = 1
SESSION_STATE_HANDSHAKE_ONGOING = 2
SESSION_STATE_HANDSHAKE_DONE = 3
AVC_PACKET_TYPE_SEQUENCE_HEADER = 0
AVC_PACKET_TYPE_NALU = 1
AVC_PACKET_TYPE_END_OF_SEQUENCE = 2
EXTENDED_TIMESTAMP_TYPE_NOT_USED = 'not-used'
EXTENDED_TIMESTAMP_TYPE_ABSOLUTE = 'absolute'
EXTENDED_TIMESTAMP_TYPE_DELTA = 'delta'
TIMESTAMP_ROUNDOFF = 4294967296 # 32 bits
DEBUG_INCOMING_STREAM_DATA = false
DEBUG_INCOMING_RTMP_PACKETS = false
DEBUG_OUTGOING_RTMP_PACKETS = false
RTMPT_SEND_REQUEST_BUFFER_SIZE = 10
# Number of active sessions
sessionsCount = 0
# Active sessions
sessions = {}
# Number of active RTMPT sessions
rtmptSessionsCount = 0
# Active RTMPT sessions
rtmptSessions = {}
# The newest client ID
clientMaxId = 0
queuedRTMPMessages = {}
# Generate a new client ID without collision
generateNewClientID = ->
clientID = generateClientID()
while sessions[clientID]?
clientID = generateClientID()
return clientID
# Generate a new random client ID (like Cookie)
generateClientID = ->
possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
numPossible = possible.length
clientID = ''
for i in [0..7]
clientID += possible.charAt((Math.random() * numPossible) | 0)
return clientID
parseAcknowledgementMessage = (buf) ->
sequenceNumber = (buf[0] * Math.pow(256, 3)) + (buf[1] << 16) + (buf[2] << 8) + buf[3]
return {
sequenceNumber: sequenceNumber
}
convertPTSToMilliseconds = (pts) ->
Math.floor pts / 90
createAudioMessage = (params) ->
# TODO: Use type 1/2/3
audioMessage = createRTMPMessage
chunkStreamID: 4
timestamp: params.timestamp
messageTypeID: 0x08 # Audio Data
messageStreamID: 1
body: params.body
, params.chunkSize
clearQueuedRTMPMessages = (stream) ->
if queuedRTMPMessages[stream.id]?
queuedRTMPMessages[stream.id] = []
queueRTMPMessages = (stream, messages, params) ->
for message in messages
message.originalTimestamp = message.timestamp
if queuedRTMPMessages[stream.id]?
queuedRTMPMessages[stream.id].push messages...
else
queuedRTMPMessages[stream.id] = [ messages... ] # Prevent copying array as reference
flushRTMPMessages stream, params
queueVideoMessage = (stream, params) ->
params.avType = 'video'
params.chunkStreamID = 4
params.messageTypeID = 0x09 # Video Data
params.messageStreamID = 1
params.originalTimestamp = params.timestamp
if queuedRTMPMessages[stream.id]?
queuedRTMPMessages[stream.id].push params
else
queuedRTMPMessages[stream.id] = [ params ]
setImmediate ->
flushRTMPMessages stream
queueAudioMessage = (stream, params) ->
params.avType = 'audio'
params.chunkStreamID = 4
params.messageTypeID = 0x08 # Audio Data
params.messageStreamID = 1
params.originalTimestamp = params.timestamp
if queuedRTMPMessages[stream.id]?
queuedRTMPMessages[stream.id].push params
else
queuedRTMPMessages[stream.id] = [ params ]
setImmediate ->
flushRTMPMessages stream
createVideoMessage = (params) ->
# TODO: Use type 1/2/3
videoMessage = createRTMPMessage
chunkStreamID: 4
timestamp: params.timestamp
messageTypeID: 0x09 # Video Data
messageStreamID: 1
body: params.body
, params.chunkSize
parseUserControlMessage = (buf) ->
eventType = (buf[0] << 8) + buf[1]
eventData = buf[2..]
message =
eventType: eventType
eventData: eventData
if eventType is 3 # SetBufferLength
# first 4 bytes: stream ID
message.streamID = (eventData[0] << 24) + (eventData[1] << 16) +
(eventData[2] << 8) + eventData[3]
# next 4 bytes: buffer length in milliseconds
message.bufferLength = (eventData[4] << 24) + (eventData[5] << 16) +
(eventData[6] << 8) + eventData[7]
return message
parseIEEE754Double = (buf) ->
sign = buf[0] >> 7 # 1 == negative
exponent = ((buf[0] & 0b1111111) << 4) + (buf[1] >> 4)
exponent -= 1023 # because 1023 means zero
fraction = 1
for i in [0..51]
byteIndex = 1 + parseInt (i + 4) / 8
bitIndex = 7 - (i + 4) % 8
bitValue = (buf[byteIndex] >> bitIndex) & 0b1
if bitValue > 0
fraction += Math.pow(2, -(i+1))
value = fraction * Math.pow 2, exponent
if sign is 1
value = -value
value
parseAMF0StrictArray = (buf) ->
arr = []
len = (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3]
readLen = 4
while --len >= 0
result = parseAMF0Data buf[readLen..]
arr.push result.value
readLen += result.readLen
return { value: arr, readLen: readLen }
parseAMF0ECMAArray = (buf) ->
# associative-count
count = (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3]
result = parseAMF0Object buf[4..], count
result.readLen += 4
return result
parseAMF0Object = (buf, maxItems=null) ->
obj = {}
bufLen = buf.length
readLen = 0
items = 0
if (not maxItems?) or (maxItems > 0)
while readLen < bufLen
nameLen = (buf[readLen++] << 8) + buf[readLen++]
if nameLen > 0 # object-end-marker will follow
name = buf.toString 'utf8', readLen, readLen + nameLen
readLen += nameLen
else
name = null
result = parseAMF0Data buf[readLen..]
readLen += result.readLen
if result.type is 'object-end-marker'
break
else
items++
if maxItems? and (items > maxItems)
logger.warn "warn: illegal AMF0 data: force break because items (#{items}) > maxItems (#{maxItems})"
break
if name?
obj[name] = result.value
else
logger.warn "warn: illegal AMF0 data: object key for value #{result.value} is zero length"
return { value: obj, readLen: readLen }
# Do opposite of parseAMF0DataMessage()
serializeAMF0DataMessage = (parsedObject) ->
bufs = []
for object in parsedObject.objects
bufs.push createAMF0Data object.value
return Buffer.concat bufs
# Decode AMF0 data message buffer into AMF0 packets
parseAMF0DataMessage = (buf) ->
amf0Packets = []
remainingLen = buf.length
while remainingLen > 0
result = parseAMF0Data buf
amf0Packets.push result
remainingLen -= result.readLen
buf = buf[result.readLen..]
return {
objects: amf0Packets
}
# Decode buffer into AMF0 packets
parseAMF0CommandMessage = (buf) ->
amf0Packets = []
remainingLen = buf.length
while remainingLen > 0
try
result = parseAMF0Data buf
catch e
logger.error "[rtmp] error parsing AMF0 command (maybe a bug); buf:"
logger.error buf
throw e
amf0Packets.push result
remainingLen -= result.readLen
buf = buf[result.readLen..]
return {
command: amf0Packets[0].value
transactionID: amf0Packets[1].value
objects: amf0Packets[2..]
}
parseAMF0Data = (buf) ->
i = 0
type = buf[i++]
if type is 0x00 # number-marker
value = buf.readDoubleBE i
return { type: 'number', value: value, readLen: i + 8 }
else if type is 0x01 # boolean-marker
value = if buf[i] is 0x00 then false else true
return { type: 'boolean', value: value, readLen: i + 1 }
else if type is 0x02 # string-marker
strLen = (buf[i++] << 8) + buf[i++]
value = buf.toString 'utf8', i, i+strLen
return { type: 'string', value: value, readLen: i + strLen }
else if type is 0x03 # object-marker
result = parseAMF0Object buf[i..]
return { type: 'object', value: result.value, readLen: i + result.readLen }
else if type is 0x05 # null-marker
return { type: 'null', value: null, readLen: i }
else if type is 0x06 # undefined-marker
return { type: 'undefined', value: undefined, readLen: i }
else if type is 0x08 # ecma-array-marker
result = parseAMF0ECMAArray buf[i..]
return { type: 'array', value: result.value, readLen: i + result.readLen }
else if type is 0x09 # object-end-marker
return { type: 'object-end-marker', readLen: i }
else if type is 0x0a # strict-array-marker
result = parseAMF0StrictArray buf[i..]
return { type: 'strict-array', value: result.value, readLen: i + result.readLen }
else if type is 0x0b # date-marker
time = buf.readDoubleBE i
date = new Date(time)
return { type: 'date', value: date, readLen: i + 10 } # 8 (time) + 2 (time-zone)
else
throw new Error "Unknown AMF0 data type: #{type}"
createAMF0Data = (data) ->
type = typeof data
buf = null
if type is 'number'
buf = new Buffer 9
buf[0] = 0x00 # number-marker
buf.writeDoubleBE data, 1
else if type is 'boolean'
buf = new Buffer 2
buf[0] = 0x01 # boolean-marker
buf[1] = if data then 0x01 else 0x00
else if type is 'string'
buf = new Buffer 3
buf[0] = 0x02 # string-marker
strBytes = new Buffer data, 'utf8'
strLen = strBytes.length
buf[1] = (strLen >> 8) & 0xff
buf[2] = strLen & 0xff
buf = Buffer.concat [buf, strBytes], 3 + strLen
else if data is null
buf = new Buffer [ 0x05 ] # null-marker
else if type is 'undefined'
buf = new Buffer [ 0x06 ] # undefined-marker
else if data instanceof Date
buf = new Buffer 11
buf[0] = 0x0b # date-marker
buf.writeDoubleBE data.getTime(), 1
# Time-zone should be 0x0000
buf[9] = 0
buf[10] = 0
else if data instanceof Array
buf = new Buffer [ 0x0a ] # strict-array-marker
buf = createAMF0StrictArray data, buf
else if type is 'object'
buf = createAMF0Object data
else
throw new Error "Unknown data type \"#{type}\" for data #{data}"
buf
createAMF0StrictArray = (arr, buf=null) ->
bufs = []
totalLength = 0
if buf?
bufs.push buf
totalLength += buf.length
# array-count (U32)
arrLen = arr.length
bufs.push new Buffer [
(arrLen >>> 24) & 0xff,
(arrLen >>> 16) & 0xff,
(arrLen >>> 8) & 0xff,
arrLen & 0xff
]
totalLength += 4
for value, i in arr
valueBytes = createAMF0Data value
bufs.push valueBytes
totalLength += valueBytes.length
return Buffer.concat bufs, totalLength
createAMF0Object = (obj) ->
buf = new Buffer [ 0x03 ] # object-marker
return createAMF0PropertyList obj, buf
createAMF0ECMAArray = (obj) ->
count = Object.keys(obj).length
buf = new Buffer [
# ecma-array-marker
0x08,
# array-count
(count >>> 24) & 0xff,
(count >>> 16) & 0xff,
(count >>> 8) & 0xff,
count & 0xff
]
return createAMF0PropertyList obj, buf
createAMF0PropertyList = (obj, buf=null) ->
bufs = []
totalLength = 0
if buf?
bufs.push buf
totalLength += buf.length
for name, value of obj
nameBytes = new Buffer name, 'utf8'
nameLen = nameBytes.length
nameLenBytes = new Buffer 2
nameLenBytes[0] = (nameLen >> 8) & 0xff
nameLenBytes[1] = nameLen & 0xff
dataBytes = createAMF0Data value
bufs.push nameLenBytes, nameBytes, dataBytes
totalLength += 2 + nameLen + dataBytes.length
# Add object-end-marker
bufs.push new Buffer [0x00, 0x00, 0x09]
totalLength += 3
return Buffer.concat bufs, totalLength
counter = 0
flushRTMPMessages = (stream, params) ->
if not stream?
logger.error "[rtmp] error: flushRTMPMessages: Invalid stream"
return
if (params?.forceFlush isnt true) and
(queuedRTMPMessages[stream.id].length < config.rtmpMessageQueueSize)
# not enough buffer
return
rtmpMessagesToSend = queuedRTMPMessages[stream.id]
queuedRTMPMessages[stream.id] = []
for rtmpMessage, i in rtmpMessagesToSend
rtmpMessage.index = i
# Move audio before video if the PTS are the same
rtmpMessagesToSend.sort (a, b) ->
cmp = a.originalTimestamp - b.originalTimestamp
if cmp is 0
if (not a.avType?) or (not b.avType?)
cmp = 0
else if a.avType is b.avType
cmp = 0
else if a.avType is 'audio' # a=audio b=video
cmp = -1
else if b.avType is 'audio' # a=video b=audio
cmp = 1
if cmp is 0
cmp = a.index - b.index # keep the original order
return cmp
if rtmpMessagesToSend.length is 0
# nothing to send
return
allSessions = []
for clientID, session of rtmptSessions
allSessions.push session.rtmpSession
for clientID, session of sessions
allSessions.push session
for session in allSessions
if session.stream?.id isnt stream.id # The session is not associated with current stream
continue
msgs = null
# If video starts with an inter frame, Flash Player might
# shows images looks like a glitch until the first keyframe.
if session.isWaitingForKeyFrame
if config.rtmpWaitForKeyFrame
if stream.isVideoStarted # has video stream
for rtmpMessage, i in rtmpMessagesToSend
if (rtmpMessage.avType is 'video') and rtmpMessage.isKeyFrame
logger.info "[rtmp:client=#{session.clientid}] started playing stream #{stream.id}"
session.startPlaying()
session.playStartTimestamp = rtmpMessage.originalTimestamp
session.playStartDateTime = Date.now() # TODO: Should we use slower process.hrtime()?
session.isWaitingForKeyFrame = false
msgs = rtmpMessagesToSend[i..]
break
else # audio only
logger.info "[rtmp:client=#{session.clientid}] started playing stream #{stream.id}"
session.startPlaying()
session.playStartTimestamp = rtmpMessagesToSend[0].originalTimestamp
session.playStartDateTime = Date.now()
session.isWaitingForKeyFrame = false
msgs = rtmpMessagesToSend
else # Do not wait for a keyframe
logger.info "[rtmp:client=#{session.clientid}] started playing stream #{stream.id}"
session.startPlaying()
session.playStartTimestamp = rtmpMessagesToSend[0].originalTimestamp
session.playStartDateTime = Date.now()
session.isWaitingForKeyFrame = false
msgs = rtmpMessagesToSend
else
msgs = rtmpMessagesToSend
if not msgs?
continue
if session.isPlaying
for rtmpMessage in msgs
# get milliseconds elapsed since play start
rtmpMessage.timestamp = session.getScaledTimestamp(rtmpMessage.originalTimestamp) % TIMESTAMP_ROUNDOFF
if session.isResuming
# Remove audio messages which are already sent until
# the first video message comes
filteredMsgs = []
for rtmpMessage, i in msgs
if not rtmpMessage.avType?
filteredMsgs.push rtmpMessage
else if rtmpMessage.avType is 'video'
filteredMsgs.push msgs[i..]...
session.isResuming = false
break
else if rtmpMessage.timestamp > session.lastSentTimestamp
filteredMsgs.push rtmpMessage
else
logger.debug "[rtmp:client=#{session.clientid}] skipped message (timestamp=#{rtmpMessage.timestamp} <= lastSentTimestamp=#{session.lastSentTimestamp})"
else
filteredMsgs = msgs
if (params?.hasControlMessage isnt true) and (filteredMsgs.length > 1)
buf = createRTMPAggregateMessage filteredMsgs, session.chunkSize
if DEBUG_OUTGOING_RTMP_PACKETS
logger.info "send RTMP agg msg: #{buf.length} bytes; time=" + filteredMsgs.map((item) -> "#{item.avType?[0] ? 'other'}#{if item.avType is 'video' and item.isKeyFrame then '(key)' else ''}:#{item.timestamp}#{if item.avType is 'video' and item.compositionTime isnt 0 then "(cmp=#{item.timestamp+item.compositionTime})" else ''}").join(',')
session.sendData buf
else
bufs = []
for rtmpMessage in filteredMsgs
bufs.push createRTMPMessage rtmpMessage, session.chunkSize
buf = Buffer.concat bufs
if DEBUG_OUTGOING_RTMP_PACKETS
logger.info "send RTMP msg: #{buf.length} bytes; time=" + filteredMsgs.map((item) -> "#{item.avType?[0] ? 'other'}:#{item.timestamp}").join(',')
session.sendData buf
session.lastSentTimestamp = filteredMsgs[filteredMsgs.length-1].timestamp
return
# RTMP Message Header used in Aggregate Message
createMessageHeader = (params) ->
payloadLength = params.body.length
if not params.messageTypeID?
logger.warn "[rtmp] warning: createMessageHeader(): messageTypeID is not set"
if not params.timestamp?
logger.warn "[rtmp] warning: createMessageHeader(): timestamp is not set"
if not params.messageStreamID?
logger.warn "[rtmp] warning: createMessageHeader(): messageStreamID is not set"
# 6.1.1. Message Header
return new Buffer [
params.messageTypeID,
# Payload length (3 bytes) big-endian
(payloadLength >> 16) & 0xff,
(payloadLength >> 8) & 0xff,
payloadLength & 0xff,
# Timestamp (4 bytes) big-endian (unusual format; not sure)
(params.timestamp >>> 16) & 0xff,
(params.timestamp >>> 8) & 0xff,
params.timestamp & 0xff,
(params.timestamp >>> 24) & 0xff,
# Stream ID (3 bytes) big-endian
(params.messageStreamID >> 16) & 0xff,
(params.messageStreamID >> 8) & 0xff,
params.messageStreamID & 0xff,
]
# All sub-messages must have the same chunk stream ID
createRTMPAggregateMessage = (rtmpMessages, chunkSize) ->
bufs = []
totalLength = 0
aggregateTimestamp = null
for rtmpMessage in rtmpMessages
if not aggregateTimestamp?
aggregateTimestamp = rtmpMessage.timestamp
header = createMessageHeader rtmpMessage
len = header.length + rtmpMessage.body.length
bufs.push header, rtmpMessage.body, new Buffer [
# Back pointer (UI32)
(len >>> 24) & 0xff,
(len >>> 16) & 0xff,
(len >>> 8) & 0xff,
len & 0xff
]
totalLength += len + 4
aggregateBody = Buffer.concat bufs, totalLength
createRTMPMessage
chunkStreamID: 4
timestamp: aggregateTimestamp
messageTypeID: 22 # Aggregate Message
messageStreamID: 1
body: aggregateBody
, chunkSize
createRTMPType1Message = (params) ->
bodyLength = params.body.length
formatTypeID = 1
if not params.body?
logger.warn "[rtmp] warning: createRTMPType1Message(): body is not set for RTMP message"
if not params.chunkStreamID?
logger.warn "[rtmp] warning: createRTMPType1Message(): chunkStreamID is not set for RTMP message"
if not params.timestampDelta?
logger.warn "[rtmp] warning: createRTMPType1Message(): timestampDelta is not set for RTMP message"
if not params.messageStreamID?
logger.warn "[rtmp] warning: createRTMPType1Message(): messageStreamID is not set for RTMP message"
useExtendedTimestamp = false
if params.timestampDelta >= 0xffffff
useExtendedTimestamp = true
ordinaryTimestampBytes = [ 0xff, 0xff, 0xff ]
else
ordinaryTimestampBytes = [
(params.timestampDelta >> 16) & 0xff,
(params.timestampDelta >> 8) & 0xff,
params.timestampDelta & 0xff,
]
# Header for Type 1 Chunk Message Header
header = new Buffer [
# Format (2 bits), Chunk Stream ID (6 bits)
(formatTypeID << 6) | params.chunkStreamID,
# Timestamp Delta (3 bytes)
ordinaryTimestampBytes[0],
ordinaryTimestampBytes[1],
ordinaryTimestampBytes[2],
# Message Length (3 bytes)
(bodyLength >> 16) & 0xff,
(bodyLength >> 8) & 0xff,
bodyLength & 0xff,
# Message Type ID (1 byte)
params.messageTypeID,
]
if useExtendedTimestamp
extendedTimestamp = new Buffer [
(params.timestampDelta >> 24) & 0xff,
(params.timestampDelta >> 16) & 0xff,
(params.timestampDelta >> 8) & 0xff,
params.timestampDelta & 0xff,
]
header = Buffer.concat [
header, extendedTimestamp
], 12
body = params.body
return Buffer.concat [header, body], 8 + bodyLength
createRTMPMessage = (params, chunkSize=128) ->
bodyLength = params.body.length
# TODO: Use format type ID 1 and 2
formatTypeID = 0
if not params.body?
logger.warn "[rtmp] warning: createRTMPMessage(): body is not set for RTMP message"
if not params.chunkStreamID?
logger.warn "[rtmp] warning: createRTMPMessage(): chunkStreamID is not set for RTMP message"
if not params.timestamp?
logger.warn "[rtmp] warning: createRTMPMessage(): timestamp is not set for RTMP message"
if not params.messageStreamID?
logger.warn "[rtmp] warning: createRTMPMessage(): messageStreamID is not set for RTMP message"
useExtendedTimestamp = false
if params.timestamp >= 0xffffff
useExtendedTimestamp = true
timestamp = [ 0xff, 0xff, 0xff ]
extendedTimestampBuf = new Buffer [
(params.timestamp >> 24) & 0xff,
(params.timestamp >> 16) & 0xff,
(params.timestamp >> 8) & 0xff,
params.timestamp & 0xff,
]
else
timestamp = [
(params.timestamp >> 16) & 0xff,
(params.timestamp >> 8) & 0xff,
params.timestamp & 0xff,
]
bufs = [
# Header for Type 0 Chunk Message Header
new Buffer [
# Format (2 bits), Chunk Stream ID (6 bits)
(formatTypeID << 6) | params.chunkStreamID,
# Timestamp (3 bytes)
timestamp[0],
timestamp[1],
timestamp[2],
# Message Length (3 bytes)
(bodyLength >> 16) & 0xff,
(bodyLength >> 8) & 0xff,
bodyLength & 0xff,
# Message Type ID (1 byte)
params.messageTypeID,
# Message Stream ID (4 bytes) little-endian
params.messageStreamID & 0xff
(params.messageStreamID >>> 8) & 0xff,
(params.messageStreamID >>> 16) & 0xff,
(params.messageStreamID >>> 24) & 0xff,
]
]
totalLength = 12
if useExtendedTimestamp
bufs.push extendedTimestampBuf
totalLength += 4
body = params.body
if bodyLength > chunkSize
bufs.push body[0...chunkSize]
totalLength += chunkSize
body = body[chunkSize..]
bodyLength -= chunkSize
# Use Format Type 3 for remaining chunks
type3Header = new Buffer [
(3 << 6) | params.chunkStreamID
]
if useExtendedTimestamp
type3Header = Buffer.concat [
type3Header,
extendedTimestampBuf
]
loop
bodyChunk = body[0...chunkSize]
bodyChunkLen = bodyChunk.length
bufs.push type3Header, bodyChunk
totalLength += type3Header.length + bodyChunkLen
body = body[bodyChunkLen..]
bodyLength -= bodyChunkLen
if bodyLength is 0
break
else
bufs.push body
totalLength += bodyLength
return Buffer.concat bufs, totalLength
createAMF0DataMessage = (params, chunkSize) ->
return createRTMPMessage createAMF0DataMessageParams(params), chunkSize
createAMF0DataMessageParams = (params) ->
len = 0
for obj in params.objects
len += obj.length
amf0Bytes = Buffer.concat params.objects, len
return {
chunkStreamID: params.chunkStreamID
timestamp: params.timestamp
messageTypeID: 0x12 # AMF0 Data
messageStreamID: params.messageStreamID
body: amf0Bytes
}
createAMF0CommandMessage = (params, chunkSize) ->
return createRTMPMessage createAMF0CommandMessageParams(params), chunkSize
createAMF0CommandMessageParams = (params) ->
commandBuf = createAMF0Data(params.command)
transactionIDBuf = createAMF0Data(params.transactionID)
len = commandBuf.length + transactionIDBuf.length
for obj in params.objects
len += obj.length
amf0Bytes = Buffer.concat [commandBuf, transactionIDBuf, params.objects...], len
return {
chunkStreamID: params.chunkStreamID
timestamp: params.timestamp
messageTypeID: 0x14 # AMF0 Command
messageStreamID: params.messageStreamID
body: amf0Bytes
}
class RTMPSession
constructor: (socket) ->
logger.debug "[rtmp] created a new session"
@listeners = {}
@state = SESSION_STATE_NEW
@socket = socket
@chunkSize = 128
@receiveChunkSize = 128
@previousChunkMessage = {}
@isPlaying = false
@clientid = generateNewClientID()
@useEncryption = false
@receiveTimestamp = null
@lastSentAckBytes = 0
@receivedBytes = 0
@stream = null # AVStream
@seekedDuringPause = false
@lastSentTimestamp = null
@isResuming = false
# Some broadcaster software like Wirecast does not send Window Acknowledgement Size,
# so it seems we have to set a default value.
@windowAckSize = 2500000
toString: ->
return "#{@clientid}: addr=#{@socket.remoteAddress} port=#{@socket.remotePort}"
startPlaying: ->
@isPlaying = true
@isResuming = false
parseVideoMessage: (buf) ->
info = flv.parseVideo buf
nalUnitGlob = null
isEOS = false
switch info.videoDataTag.avcPacketType
when flv.AVC_PACKET_TYPE_SEQUENCE_HEADER
# Retain AVC configuration
@avcInfo = info.avcDecoderConfigurationRecord
if @avcInfo.numOfSPS > 1
logger.warn "warn: flv:parseVideo(): numOfSPS is #{numOfSPS} > 1 (may not work)"
if @avcInfo.numOfPPS > 1
logger.warn "warn: flv:parseVideo(): numOfPPS is #{numOfPPS} > 1 (may not work)"
sps = h264.concatWithStartCodePrefix @avcInfo.sps
pps = h264.concatWithStartCodePrefix @avcInfo.pps
nalUnitGlob = Buffer.concat [sps, pps]
when flv.AVC_PACKET_TYPE_NALU
if not @avcInfo?
throw new Error "[rtmp:publish] malformed video data: avcInfo is missing"
# TODO: This must be too heavy and needs better alternative.
nalUnits = flv.splitNALUnits info.nalUnits, @avcInfo.nalUnitLengthSize
nalUnitGlob = h264.concatWithStartCodePrefix nalUnits
when flv.AVC_PACKET_TYPE_EOS
isEOS = true
else
throw new Error "unknown AVCPacketType: #{flv.AVC_PACKET_TYPE_SEQUENCE_HEADER}"
return {
info: info
nalUnitGlob: nalUnitGlob
isEOS: isEOS
}
parseAudioMessage: (buf) ->
info = flv.parseAudio buf
adtsFrame = null
stream = @stream
if not stream?
throw new Error "[rtmp] Stream not set for this session"
switch info.audioDataTag.aacPacketType
when flv.AAC_PACKET_TYPE_SEQUENCE_HEADER
if info.audioSpecificConfig?
stream.updateConfig
audioSpecificConfig: info.audioSpecificConfig
audioASCInfo: info.ascInfo
else
logger.warn "[rtmp] skipping empty AudioSpecificConfig"
when flv.AAC_PACKET_TYPE_RAW
if not stream.audioASCInfo?
logger.error "[rtmp:publish] malformed audio data: AudioSpecificConfig is missing"
# TODO: This must be a little heavy and needs better alternative.
adtsHeader = new Buffer aac.createADTSHeader stream.audioASCInfo, info.rawDataBlock.length
adtsFrame = Buffer.concat [ adtsHeader, info.rawDataBlock ]
else
throw new Error "[rtmp:publish] unknown AAC_PACKET_TYPE: #{info.audioDataTag.aacPacketType}"
return {
info: info
adtsFrame: adtsFrame
}
clearTimeout: ->
if @timeoutTimer?
clearTimeout @timeoutTimer
@timeoutTimer = null
scheduleTimeout: ->
if @isTearedDown
return
@clearTimeout()
@lastTimeoutScheduledTime = Date.now()
@timeoutTimer = setTimeout =>
if @isTearedDown
return
if not @timeoutTimer?
return
if Date.now() - @lastTimeoutScheduledTime < config.rtmpSessionTimeoutMs
return
logger.info "[rtmp:client=#{@clientid}] session timeout"
@teardown()
, config.rtmpSessionTimeoutMs
schedulePing: ->
@lastPingScheduledTime = Date.now()
if @pingTimer?
clearTimeout @pingTimer
@pingTimer = setTimeout =>
if Date.now() - @lastPingScheduledTime < config.rtmpPingTimeoutMs
logger.debug "[rtmp] ping timeout canceled"
@ping()
, config.rtmpPingTimeoutMs
ping: ->
currentTimestamp = @getCurrentTimestamp()
pingRequest = createRTMPMessage
chunkStreamID: 2
timestamp: currentTimestamp
messageTypeID: 0x04 # User Control Message
messageStreamID: 0
body: new Buffer [
# Event Type: 6=PingRequest
0, 6,
# Server Timestamp
(currentTimestamp >> 24) & 0xff,
(currentTimestamp >> 16) & 0xff,
(currentTimestamp >> 8) & 0xff,
currentTimestamp & 0xff
]
@sendData pingRequest
stopPlaying: ->
@isPlaying = false
@isWaitingForKeyFrame = false
teardown: ->
if @isTearedDown
logger.debug "[rtmp] already teared down"
return
@isTearedDown = true
@clearTimeout()
@stopPlaying()
if @stream?.type is avstreams.STREAM_TYPE_RECORDED
@stream.teardown?()
if @cipherIn?
@cipherIn.final()
@cipherIn = null
if @cipherOut?
@cipherOut.final()
@cipherOut = null
try
@socket.end()
catch e
logger.error "[rtmp] socket.end error: #{e}"
@emit 'teardown'
getCurrentTimestamp: ->
return Date.now() - @playStartDateTime
getScaledTimestamp: (timestamp) ->
ts = timestamp - @playStartTimestamp
if ts < 0
ts = 0
return ts
createVideoMessage: (params) ->
params.chunkStreamID = 4
params.messageTypeID = 0x09 # Video Data
params.messageStreamID = 1
return @createAVMessage params
createAudioMessage: (params) ->
params.chunkStreamID = 4
params.messageTypeID = 0x08 # Audio Data
params.messageStreamID = 1
return @createAVMessage params
createAVMessage: (params) ->
thisTimestamp = @getScaledTimestamp params.timestamp
if @lastAVTimestamp? and params.body.length <= @chunkSize
# Use Type 1 if chunking is not needed
params.timestampDelta = (thisTimestamp - @lastAVTimestamp) % TIMESTAMP_ROUNDOFF
msg = createRTMPType1Message params
else
# Use Type 0
msg = createRTMPMessage params, @chunkSize
@lastAVTimestamp = thisTimestamp
return msg
concatenate: (arr) ->
if Buffer.isBuffer arr
return arr
if not (arr instanceof Array)
return
len = 0
for item, i in arr
if item?
len += item.length
else
arr[i] = new Buffer 0
return Buffer.concat arr, len
emit: (event, args...) ->
if not @listeners[event]?
return
for listener in @listeners[event]
listener args...
return
on: (event, listener) ->
if not @listeners[event]?
@listeners[event] = [listener]
else
@listeners[event].push listener
return
removeListener: (event, listener) ->
listeners = @listeners[event]
if not listeners?
return
removedCount = 0
for _listener, i in listeners
if _listener is listener
logger.debug "[rtmp] removed listener for #{event}"
actualIndex = i - removedCount
listeners[actualIndex..actualIndex] = [] # Remove element
removedCount++
return
sendData: (arr) ->
if not arr?
return
if Buffer.isBuffer arr
buf = arr
else
len = 0
for item in arr
len += item.length
buf = Buffer.concat arr, len
if @useEncryption
buf = @encrypt buf