media

package module
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 Go to latest Published: Jun 5, 2024 License: BSD-2-Clause Imports: 16 Imported by: 6

README

media

Go Report Card Coverage License GitHub go.mod Go version

is GO library designed handling real time media for usage with sipgo It has APIs for creating and running protocols like SDP, RTP, RTCP.

Library is currently focused only to provide VOIP needs and removing complexity. As with sipgo focus is to provide minimal GC hits and latency.

Tools using this

IO flow

more docs...

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	// RTPPortStart and RTPPortEnd allows defining rtp port range for media
	RTPPortStart = 0
	RTPPortEnd   = 0

	// When reading RTP use at least MTU size. Increase this
	RTPBufSize = 1500

	RTPDebug  = false
	RTCPDebug = false
)
View Source 
var (
	ErrRTPSequenceOutOfOrder = errors.New("out of order")
	ErrRTPSequenceBad        = errors.New("bad sequence")
	ErrRTPSequnceDuplicate   = errors.New("sequence duplicate")
)

Functions

func DTMFDecode 

func DTMFDecode(payload []byte, d *DTMFEvent) error

DecodeRTPPayload decodes an RTP payload into a DTMF event

func DTMFEncode 

func DTMFEncode(d DTMFEvent) []byte

func FractionLostFloat 

func FractionLostFloat(f uint8) float64

func GetCurrentNTPTimestamp 

func GetCurrentNTPTimestamp() uint64

func NTPTimestamp 

func NTPTimestamp(now time.Time) uint64

func NTPToTime 

func NTPToTime(ntp uint64) time.Time

func SendDummyRTP 

func SendDummyRTP(rtpConn *net.UDPConn, raddr net.Addr)

Types

type DTMFEvent 

type DTMFEvent struct {
	Event      uint8
	EndOfEvent bool
	Volume     uint8
	Duration   uint16
}

DTMFEvent represents a DTMF event

func RTPDTMFEncode 

func RTPDTMFEncode(char rune) []DTMFEvent

RTPDTMFEncode creates series of DTMF redudant events which should be encoded as payload It is currently only 8000 sample rate considered for telophone event

func (*DTMFEvent) String 

func (ev *DTMFEvent) String() string

type MediaSession 

type MediaSession struct {
	// Raddr is our target remote address. Normally it is resolved by SDP parsing.
	// Checkout SetRemoteAddr
	Raddr *net.UDPAddr
	// Laddr our local address which has full IP and port after media session creation
	Laddr *net.UDPAddr

	// SDP stuff
	// Depending of negotiation this can change.
	Formats sdp.Formats
	Mode    sdp.Mode
	// contains filtered or unexported fields
}

MediaSession represents active media session with RTP/RTCP

func NewMediaSession 

func NewMediaSession(laddr *net.UDPAddr) (s *MediaSession, e error)

func (*MediaSession) Close 

func (s *MediaSession) Close()

func (*MediaSession) LocalSDP 

func (s *MediaSession) LocalSDP() []byte

func (*MediaSession) ReadRTCP 

func (m *MediaSession) ReadRTCP(pkts []rtcp.Packet) (n int, err error)

func (*MediaSession) ReadRTCPRaw 

func (m *MediaSession) ReadRTCPRaw(buf []byte) (int, error)

func (*MediaSession) ReadRTCPRawDeadline 

func (m *MediaSession) ReadRTCPRawDeadline(buf []byte, t time.Time) (int, error)

func (*MediaSession) ReadRTP 

func (m *MediaSession) ReadRTP(buf []byte, pkt *rtp.Packet) error

ReadRTP reads data from network and parses to pkt buffer is passed in order to avoid extra allocs

func (*MediaSession) ReadRTPRaw 

func (m *MediaSession) ReadRTPRaw(buf []byte) (int, error)

func (*MediaSession) ReadRTPRawDeadline 

func (m *MediaSession) ReadRTPRawDeadline(buf []byte, t time.Time) (int, error)

func (*MediaSession) RemoteSDP 

func (s *MediaSession) RemoteSDP(sdpReceived []byte) error

func (*MediaSession) SetLogger 

func (s *MediaSession) SetLogger(log zerolog.Logger)

func (*MediaSession) SetRemoteAddr 

func (s *MediaSession) SetRemoteAddr(raddr *net.UDPAddr)

SetRemoteAddr is helper to set Raddr and rtcp address. It is not thread safe

func (*MediaSession) UpdateDestinationSDP 

func (s *MediaSession) UpdateDestinationSDP(sdpReceived []byte) error

func (*MediaSession) WriteRTCP 

func (m *MediaSession) WriteRTCP(p rtcp.Packet) error

func (*MediaSession) WriteRTCPDeadline 

func (m *MediaSession) WriteRTCPDeadline(p rtcp.Packet, deadline time.Time) error

func (*MediaSession) WriteRTCPs 

func (m *MediaSession) WriteRTCPs(pkts []rtcp.Packet) error

Use this to write Multi RTCP packets if they can fit in MTU=1500

func (*MediaSession) WriteRTP 

func (m *MediaSession) WriteRTP(p *rtp.Packet) error

func (*MediaSession) WriteRTPRaw 

func (m *MediaSession) WriteRTPRaw(data []byte) (n int, err error)

type MediaStreamer 

type MediaStreamer interface {
	MediaStream(s *MediaSession) error
}

type RTPExtendedSequenceNumber 

type RTPExtendedSequenceNumber struct {
	// contains filtered or unexported fields
}

RTPExtendedSequenceNumber is embedable/ replacable sequnce number generator For thread safety you should wrap it

func NewRTPSequencer 

func NewRTPSequencer() RTPExtendedSequenceNumber

func (*RTPExtendedSequenceNumber) InitSeq 

func (sn *RTPExtendedSequenceNumber) InitSeq(seq uint16)

func (*RTPExtendedSequenceNumber) NextSeqNumber 

func (s *RTPExtendedSequenceNumber) NextSeqNumber() uint16

func (*RTPExtendedSequenceNumber) ReadExtendedSeq 

func (sn *RTPExtendedSequenceNumber) ReadExtendedSeq() uint64

func (*RTPExtendedSequenceNumber) UpdateSeq 

func (sn *RTPExtendedSequenceNumber) UpdateSeq(seq uint16) error

Based on https://datatracker.ietf.org/doc/html/rfc1889#appendix-A.2

type RTPReadStats 

type RTPReadStats struct {
	SSRC                   uint32
	FirstPktSequenceNumber uint16
	LastSequenceNumber     uint16

	// tracks first pkt seq in this interval to calculate loss of packets
	IntervalFirstPktSeqNum uint16
	IntervalTotalPackets   uint16

	TotalPackets uint64

	// Round TRIP Time based on LSR and DLSR
	RTT time.Duration
	// contains filtered or unexported fields
}

type RTPReader 

type RTPReader struct {
	Sess       *MediaSession
	RTPSession *RTPSession

	// Deprecated
	//
	// Should not be used
	OnRTP func(pkt *rtp.Packet)

	// PacketHeader is stored after calling Read this will be stored before returning
	PacketHeader rtp.Header
	PayloadType  uint8
	// contains filtered or unexported fields
}

RTP Writer packetize any payload before pushing to active media session

func NewRTPReader 

func NewRTPReader(sess *RTPSession) *RTPReader

RTP reader consumes samples of audio from RTP session Use NewRTPSession to construct RTP session

func NewRTPReaderMedia 

func NewRTPReaderMedia(sess *MediaSession) *RTPReader

NewRTPWriterMedia is left for backward compability. It does not add RTCP reporting It talks directly to network

func (*RTPReader) Read 

func (r *RTPReader) Read(b []byte) (int, error)

Read Implements io.Reader and extracts Payload from RTP packet has no input queue or sorting control of packets Buffer is used for reading headers and Headers are stored in PacketHeader

NOTE: Consider that if you are passsing smaller buffer than RTP payload, io.ErrShortBuffer is returned

type RTPSession 

type RTPSession struct {
	// Keep pointers at top to reduce GC
	Sess *MediaSession

	// Experimental
	// this intercepts reading or writing rtcp packet. Allows manipulation
	OnReadRTCP  func(pkt rtcp.Packet, rtpStats RTPReadStats)
	OnWriteRTCP func(pkt rtcp.Packet, rtpStats RTPWriteStats)
	// contains filtered or unexported fields
}

RTP session is RTP ReadWriter with control (RTCP) reporting Session is identified by network address and port pair to which data should be sent and received Participant can be part of multiple rtp sessions. One for audio, one for media. So for different MediaSession (audio,video etc) different RTP session needs to be created TODO RTPSession can be different type: - unicast or multicase - replicated unicast (mixers audio) RTP session is attached to RTPReader and RTPWriter Now: - Designed for UNICAST sessions - Acts as RTP Reader Writer - Only makes sense for Reporting Quality mediaw Roadmap: - Can handle multiple SSRC from Reader - Multiple RTCP Recever Blocks

func NewRTPSession 

func NewRTPSession(sess *MediaSession) *RTPSession

RTP session creates new RTP reader/writer from session

func (*RTPSession) Close 

func (s *RTPSession) Close() error

func (*RTPSession) Monitor 

func (s *RTPSession) Monitor()

Monitor starts reading RTCP and monitoring media quality

func (*RTPSession) ReadRTP 

func (s *RTPSession) ReadRTP(b []byte, readPkt *rtp.Packet) error

func (*RTPSession) WriteRTP 

func (s *RTPSession) WriteRTP(pkt *rtp.Packet) error

type RTPWriteStats 

type RTPWriteStats struct {
	SSRC uint32

	// RTCP stats
	PacketsCount uint32
	OctetCount   uint32
	// contains filtered or unexported fields
}

type RTPWriter 

type RTPWriter struct {
	RTPSession *RTPSession
	Sess       *MediaSession

	// After each write this is set as packet.
	LastPacket rtp.Packet
	OnRTP      func(pkt *rtp.Packet)

	// This properties are read only or can be changed only after creating writer
	PayloadType uint8
	SSRC        uint32
	SampleRate  uint32
	// contains filtered or unexported fields
}

RTP Writer packetize any payload before pushing to active media session It creates SSRC as identifier and all packets sent will be with this SSRC For multiple streams, multiple RTP Writer needs to be created

func NewRTPWriter 

func NewRTPWriter(sess *RTPSession) *RTPWriter

RTP writer packetize payload in RTP packet before passing on media session Not having: - random Timestamp - allow different clock rate - CSRC contribution source - Silence detection and marker set - Padding and encryyption

func NewRTPWriterMedia 

func NewRTPWriterMedia(sess *MediaSession) *RTPWriter

NewRTPWriterMedia is left for backward compability. It does not add RTCP reporting RTPSession should be used for media quality reporting

func (*RTPWriter) Write 

func (p *RTPWriter) Write(b []byte) (int, error)

Write implements io.Writer and does payload RTP packetization Media clock rate is determined For more control or dynamic payload WriteSamples can be used It is not thread safe and order of payload frames is required Has no capabilities (yet): - MTU UDP limit handling - Media clock rate of payload is consistent - Packet loss detection - RTCP generating

func (*RTPWriter) WriteSamples 

func (p *RTPWriter) WriteSamples(payload []byte, clockRateTimestamp uint32, marker bool, payloadType uint8) (int, error)

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