core

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 Go to latest Published: Sep 19, 2024 License: MIT Imports: 18 Imported by: 0

README

PCM

RTSP

  • PayloadType=10 - L16/44100/2 - Linear PCM 16-bit big endian
  • PayloadType=11 - L16/44100/1 - Linear PCM 16-bit big endian

https://en.wikipedia.org/wiki/RTP_payload_formats

Apple QuickTime

  • raw - 16-bit data is stored in little endian format
  • twos - 16-bit data is stored in big endian format
  • sowt - 16-bit data is stored in little endian format
  • in24 - denotes 24-bit, big endian
  • in32 - denotes 32-bit, big endian
  • fl32 - denotes 32-bit floating point PCM
  • fl64 - denotes 64-bit floating point PCM
  • alaw - denotes A-law logarithmic PCM
  • ulaw - denotes mu-law logarithmic PCM

https://wiki.multimedia.cx/index.php/PCM

FFmpeg RTSP

pcm_s16be, 44100 Hz, stereo => 10
pcm_s16be, 48000 Hz, stereo => 96 L16/48000/2
pcm_s16be, 44100 Hz, mono   => 11

pcm_s16le, 48000 Hz, stereo => 96 (b=AS:1536)
pcm_s16le, 44100 Hz, stereo => 96 (b=AS:1411)
pcm_s16le, 16000 Hz, stereo => 96 (b=AS:512)
pcm_s16le, 8000 Hz, stereo  => 96 (b=AS:256)

pcm_s16le, 48000 Hz, mono   => 96 (b=AS:768)
pcm_s16le, 44100 Hz, mono   => 96 (b=AS:705)
pcm_s16le, 16000 Hz, mono   => 96 (b=AS:256)
pcm_s16le, 8000 Hz, mono    => 96 (b=AS:128)

Documentation

Index

Constants

View Source 
const (
	DirectionRecvonly = "recvonly"
	DirectionSendonly = "sendonly"
	DirectionSendRecv = "sendrecv"
)
View Source 
const (
	KindVideo = "video"
	KindAudio = "audio"
)
View Source 
const (
	CodecH264 = "H264" // payloadType: 96
	CodecH265 = "H265"
	CodecVP8  = "VP8"
	CodecVP9  = "VP9"
	CodecAV1  = "AV1"
	CodecJPEG = "JPEG" // payloadType: 26
	CodecRAW  = "RAW"

	CodecPCMU = "PCMU" // payloadType: 0
	CodecPCMA = "PCMA" // payloadType: 8
	CodecAAC  = "MPEG4-GENERIC"
	CodecOpus = "OPUS" // payloadType: 111
	CodecG722 = "G722"
	CodecMP3  = "MPA" // payload: 14, aka MPEG-1 Layer III
	CodecPCM  = "L16" // Linear PCM (big endian)

	CodecPCML = "PCML" // Linear PCM (little endian)

	CodecELD  = "ELD" // AAC-ELD
	CodecFLAC = "FLAC"

	CodecAll = "ALL"
	CodecAny = "ANY"
)
View Source 
const (
	BufferSize      = 64 * 1024 // 64K
	ConnDialTimeout = time.Second * 3
	ConnDeadline    = time.Second * 5
	ProbeTimeout    = time.Second * 3
)
View Source 
const (
	BufferDisable       = 0
	BufferDrainAndClear = -1
)
View Source 
const PayloadTypeRAW byte = 255
View Source 
const ProbeSize = 5 * 1024 * 1024 // 5MB

ProbeSize in my tests MPEG-TS 40Mbit/s 4K-video require more than 1MB for probe

Variables

View Source 
var ErrCantGetTrack = errors.New("can't get track")

Functions

func Assert 

func Assert(ok bool)

func Atoi 

func Atoi(s string) (i int)

func Before 

func Before(s, sep string) string

func Between 

func Between(s, sub1, sub2 string) string

func Caller 

func Caller() string

func DecodeH264 

func DecodeH264(fmtp string) (profile string, level byte)

func FFmpegCodecName 

func FFmpegCodecName(name string) string

func GetKind 

func GetKind(name string) string

func ID deprecated 

func ID(v any) uint32

Deprecated: use NewID instead

func MarshalSDP 

func MarshalSDP(name string, medias []*Media) ([]byte, error)

func MoveNode 

func MoveNode(dst, src *Node)

func NewID 

func NewID() uint32

func Now90000 

func Now90000() uint32

Now90000 - timestamp for Video (clock rate = 90000 samples per second)

func RandString 

func RandString(size, base byte) string

RandString base10 - numbers, base16 - hex, base36 - digits+letters base64 - URL safe symbols, base0 - crypto random

Types

type Codec 

type Codec struct {
	Name        string // H264, PCMU, PCMA, opus...
	ClockRate   uint32 // 90000, 8000, 16000...
	Channels    uint16 // 0, 1, 2
	FmtpLine    string
	PayloadType uint8
}

func UnmarshalCodec 

func UnmarshalCodec(md *sdp.MediaDescription, payloadType string) *Codec

func (*Codec) Clone 

func (c *Codec) Clone() *Codec

func (*Codec) IsAudio 

func (c *Codec) IsAudio() bool

func (*Codec) IsRTP 

func (c *Codec) IsRTP() bool

func (*Codec) IsVideo 

func (c *Codec) IsVideo() bool

func (*Codec) Kind 

func (c *Codec) Kind() string

func (*Codec) MarshalJSON 

func (c *Codec) MarshalJSON() ([]byte, error)

MarshalJSON - return FFprobe compatible output

func (*Codec) Match 

func (c *Codec) Match(remote *Codec) bool

func (*Codec) PrintName 

func (c *Codec) PrintName() string

func (*Codec) String 

func (c *Codec) String() (s string)

type Connection 

type Connection struct {
	ID         uint32 `json:"id,omitempty"`
	FormatName string `json:"format_name,omitempty"` // rtsp, webrtc, mp4, mjpeg, mpjpeg...
	Protocol   string `json:"protocol,omitempty"`    // tcp, udp, http, ws, pipe...
	RemoteAddr string `json:"remote_addr,omitempty"` // host:port other info
	Source     string `json:"source,omitempty"`
	URL        string `json:"url,omitempty"`
	SDP        string `json:"sdp,omitempty"`
	UserAgent  string `json:"user_agent,omitempty"`

	Medias    []*Media    `json:"medias,omitempty"`
	Receivers []*Receiver `json:"receivers,omitempty"`
	Senders   []*Sender   `json:"senders,omitempty"`
	Recv      int         `json:"bytes_recv,omitempty"`
	Send      int         `json:"bytes_send,omitempty"`

	Transport any `json:"-"`
}

Connection just like webrtc.PeerConnection - ID and RemoteAddr used for building Connection(s) graph - FormatName, Protocol, RemoteAddr, Source, URL, SDP, UserAgent used for info about Connection - FormatName and Protocol has FFmpeg compatible names - Transport used for auto closing on Stop

func Create 

func Create(w io.Writer) (*Connection, error)

Create like os.Create, init Consumer with existing Transport

func Dial 

func Dial(rawURL string) (*Connection, error)

Dial like net.Dial, init Producer via Dialing

func Open 

func Open(r io.Reader) (*Connection, error)

Open like os.Open, init Producer from existing Transport

func (*Connection) Codecs deprecated 

func (c *Connection) Codecs() []*Codec

Deprecated:

func (*Connection) GetMedias 

func (c *Connection) GetMedias() []*Media

func (*Connection) GetTrack 

func (c *Connection) GetTrack(media *Media, codec *Codec) (*Receiver, error)

func (*Connection) SetProtocol 

func (c *Connection) SetProtocol(s string)

func (*Connection) SetRemoteAddr 

func (c *Connection) SetRemoteAddr(s string)

func (*Connection) SetSource 

func (c *Connection) SetSource(s string)

func (*Connection) SetURL 

func (c *Connection) SetURL(s string)

func (*Connection) Stop 

func (c *Connection) Stop() error

func (*Connection) WithRequest 

func (c *Connection) WithRequest(r *http.Request)

type Consumer 

type Consumer interface {
	// GetMedias - return Media(s) with local Media.Direction:
	// - sendonly for Consumer Video/Audio
	// - recvonly for Consumer backchannel
	GetMedias() []*Media

	AddTrack(media *Media, codec *Codec, track *Receiver) error

	// Deprecated: rename to Close()
	Stop() error
}

type EventFunc 

type EventFunc func(msg any)

type Filter 

type Filter func(handler HandlerFunc) HandlerFunc

Filter - a decorator for any HandlerFunc

type HandlerFunc 

type HandlerFunc func(packet *Packet)

HandlerFunc - process input packets (just like http.HandlerFunc)

type Info 

type Info interface {
	SetProtocol(string)
	SetRemoteAddr(string)
	SetSource(string)
	SetURL(string)
	WithRequest(*http.Request)
}

type Listener 

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

Listener base struct for all classes with support feedback

func (*Listener) Fire 

func (l *Listener) Fire(msg any)

func (*Listener) Listen 

func (l *Listener) Listen(f EventFunc)

type Media 

type Media struct {
	Kind      string   `json:"kind,omitempty"`      // video or audio
	Direction string   `json:"direction,omitempty"` // sendonly, recvonly
	Codecs    []*Codec `json:"codecs,omitempty"`

	ID string `json:"id,omitempty"` // MID for WebRTC, Control for RTSP
}

Media take best from: - deepch/vdk/format/rtsp/sdp.Media - pion/sdp.MediaDescription

func ParseQuery 

func ParseQuery(query map[string][]string) (medias []*Media)

func UnmarshalMedia 

func UnmarshalMedia(md *sdp.MediaDescription) *Media

func (*Media) Clone 

func (m *Media) Clone() *Media

func (*Media) Equal 

func (m *Media) Equal(media *Media) bool

func (*Media) MarshalJSON 

func (m *Media) MarshalJSON() ([]byte, error)

func (*Media) MatchAll 

func (m *Media) MatchAll() bool

func (*Media) MatchCodec 

func (m *Media) MatchCodec(remote *Codec) *Codec

func (*Media) MatchMedia 

func (m *Media) MatchMedia(remote *Media) (codec, remoteCodec *Codec)

func (*Media) String 

func (m *Media) String() string

type Mode 

type Mode byte
const (
	ModeActiveProducer Mode = iota + 1 // typical source (client)
	ModePassiveConsumer
	ModePassiveProducer
	ModeActiveConsumer
)

func (Mode) MarshalJSON 

func (m Mode) MarshalJSON() ([]byte, error)

func (Mode) String 

func (m Mode) String() string

type Node 

type Node struct {
	Codec  *Codec
	Input  HandlerFunc
	Output HandlerFunc
	// contains filtered or unexported fields
}

Node - Receiver or Sender or Filter (transform)

func (*Node) AppendChild 

func (n *Node) AppendChild(child *Node)

func (*Node) Close 

func (n *Node) Close()

func (*Node) RemoveChild 

func (n *Node) RemoveChild(child *Node)

func (*Node) WithParent 

func (n *Node) WithParent(parent *Node) *Node

type OnceBuffer 

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

OnceBuffer will catch only first message

func (*OnceBuffer) Buffer 

func (o *OnceBuffer) Buffer() []byte

func (*OnceBuffer) Len 

func (o *OnceBuffer) Len() int

func (*OnceBuffer) Write 

func (o *OnceBuffer) Write(p []byte) (n int, err error)

func (*OnceBuffer) WriteTo 

func (o *OnceBuffer) WriteTo(w io.Writer) (n int64, err error)

type Packet 

type Packet = rtp.Packet

type Producer 

type Producer interface {
	// GetMedias - return Media(s) with local Media.Direction:
	// - recvonly for Producer Video/Audio
	// - sendonly for Producer backchannel
	GetMedias() []*Media

	// GetTrack - return Receiver, that can only produce rtp.Packet(s)
	GetTrack(media *Media, codec *Codec) (*Receiver, error)

	// Deprecated: rename to Run()
	Start() error

	// Deprecated: rename to Close()
	Stop() error
}

type ReadBuffer 

type ReadBuffer struct {
	io.Reader

	BufferSize int
	// contains filtered or unexported fields
}

ReadBuffer support buffering and Seek over buffer positive BufferSize will enable buffering mode Seek to negative offset will clear buffer Seek with a positive BufferSize will continue buffering after the last read from the buffer Seek with a negative BufferSize will clear buffer after the last read from the buffer Read more than BufferSize will raise error

func NewReadBuffer 

func NewReadBuffer(rd io.Reader) *ReadBuffer

func (*ReadBuffer) Close 

func (r *ReadBuffer) Close() error

func (*ReadBuffer) Peek 

func (r *ReadBuffer) Peek(n int) ([]byte, error)

func (*ReadBuffer) Read 

func (r *ReadBuffer) Read(p []byte) (n int, err error)

func (*ReadBuffer) Reset 

func (r *ReadBuffer) Reset()

func (*ReadBuffer) Seek 

func (r *ReadBuffer) Seek(offset int64, whence int) (int64, error)

type Receiver 

type Receiver struct {
	Node

	// Deprecated: should be removed
	Media *Media `json:"-"`
	// Deprecated: should be removed
	ID byte `json:"-"` // Channel for RTSP, PayloadType for MPEG-TS

	Bytes   int `json:"bytes,omitempty"`
	Packets int `json:"packets,omitempty"`
}

func NewReceiver 

func NewReceiver(media *Media, codec *Codec) *Receiver

func (*Receiver) Close 

func (r *Receiver) Close()

func (*Receiver) MarshalJSON 

func (r *Receiver) MarshalJSON() ([]byte, error)

func (*Receiver) Replace deprecated 

func (r *Receiver) Replace(target *Receiver)

Deprecated: should be removed

func (*Receiver) Senders deprecated 

func (r *Receiver) Senders() []*Sender

Deprecated: should be removed

func (*Receiver) WriteRTP deprecated 

func (r *Receiver) WriteRTP(packet *rtp.Packet)

Deprecated: should be removed

type Sender 

type Sender struct {
	Node

	// Deprecated:
	Media *Media `json:"-"`
	// Deprecated:
	Handler HandlerFunc `json:"-"`

	Bytes   int `json:"bytes,omitempty"`
	Packets int `json:"packets,omitempty"`
	Drops   int `json:"drops,omitempty"`
	// contains filtered or unexported fields
}

func NewSender 

func NewSender(media *Media, codec *Codec) *Sender

func (*Sender) Bind deprecated 

func (s *Sender) Bind(parent *Receiver)

Deprecated: should be removed

func (*Sender) Close 

func (s *Sender) Close()

func (*Sender) HandleRTP deprecated 

func (s *Sender) HandleRTP(parent *Receiver)

Deprecated: should be removed

func (*Sender) MarshalJSON 

func (s *Sender) MarshalJSON() ([]byte, error)

func (*Sender) Start 

func (s *Sender) Start()

func (*Sender) State 

func (s *Sender) State() string

func (*Sender) Wait 

func (s *Sender) Wait()

func (*Sender) WithParent 

func (s *Sender) WithParent(parent *Receiver) *Sender

type Waiter 

type Waiter struct {
	sync.WaitGroup
	// contains filtered or unexported fields
}

Waiter support: - autotart on first Wait - block new waiters after last Done - safe Done after finish

func (*Waiter) Add 

func (w *Waiter) Add(delta int)

func (*Waiter) Done 

func (w *Waiter) Done(err error)

func (*Waiter) Wait 

func (w *Waiter) Wait() error

func (*Waiter) WaitChan 

func (w *Waiter) WaitChan() <-chan error

type Worker 

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

func NewWorker 

func NewWorker(d time.Duration, f func() time.Duration) *Worker

NewWorker run f after d

func (*Worker) Do 

func (w *Worker) Do()

Do - instant timer run

func (*Worker) Stop 

func (w *Worker) Stop()

type WriteBuffer 

type WriteBuffer struct {
	io.Writer
	// contains filtered or unexported fields
}

WriteBuffer by defaul Write(s) to bytes.Buffer. But after WriteTo to new io.Writer - calls Reset. Reset will flush current buffer data to new writer and starts to Write to new io.Writer WriteTo will be locked until Write fails or Close will be called.

func NewWriteBuffer 

func NewWriteBuffer(wr io.Writer) *WriteBuffer

func (*WriteBuffer) Close 

func (w *WriteBuffer) Close() error

func (*WriteBuffer) Reset 

func (w *WriteBuffer) Reset(wr io.Writer)

func (*WriteBuffer) Write 

func (w *WriteBuffer) Write(p []byte) (n int, err error)

func (*WriteBuffer) WriteTo 

func (w *WriteBuffer) WriteTo(wr io.Writer) (n int64, err error)

Source Files

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