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Documentation

Index

• Variables
• func NewTSPacketizer(mtu uint16, payloader rtp.Payloader, sequencer rtp.Sequencer) rtp.Packetizer
• func PipelineString(from, to webrtc.RTPCodecParameters, encoder string) (string, error)
• type CodecMapping
• type GStreamerParameters

Variables

var DefaultOutputCodecs = map[string]webrtc.RTPCodecParameters{
	webrtc.MimeTypePCMU: {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypePCMU, ClockRate: 8000, Channels: 1},
		PayloadType:        0,
	},
	"audio/GSM": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/GSM", ClockRate: 8000, Channels: 1},
		PayloadType:        3,
	},
	"audio/G723": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/G723", ClockRate: 8000, Channels: 1},
		PayloadType:        4,
	},
	"audio/LPC": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/LPC", ClockRate: 8000, Channels: 1},
		PayloadType:        7,
	},
	webrtc.MimeTypePCMA: {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypePCMA, ClockRate: 8000, Channels: 1},
		PayloadType:        8,
	},
	webrtc.MimeTypeG722: {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeG722, ClockRate: 8000, Channels: 1},
		PayloadType:        9,
	},
	"audio/L16": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/L16", ClockRate: 44100, Channels: 2},
		PayloadType:        10,
	},
	"audio/QCELP": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/QCELP", ClockRate: 8000, Channels: 1},
		PayloadType:        12,
	},
	"audio/CN": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/CN", ClockRate: 8000, Channels: 1},
		PayloadType:        13,
	},
	"audio/MPA": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/MPA", ClockRate: 90000, Channels: 1},
		PayloadType:        14,
	},
	"audio/G728": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/G728", ClockRate: 8000, Channels: 1},
		PayloadType:        15,
	},
	"audio/DVI4": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/DVI4", ClockRate: 22050, Channels: 1},
		PayloadType:        17,
	},
	"audio/G729": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/G729", ClockRate: 8000, Channels: 1},
		PayloadType:        18,
	},

	webrtc.MimeTypeVP8: {
		RTPCodecCapability: webrtc.RTPCodecCapability{
			MimeType:     webrtc.MimeTypeVP8,
			ClockRate:    90000,
			RTCPFeedback: []webrtc.RTCPFeedback{{Type: "goog-remb", Parameter: ""}, {Type: "ccm", Parameter: "fir"}, {Type: "nack", Parameter: ""}, {Type: "nack", Parameter: "pli"}},
		},
		PayloadType: 100,
	},
	webrtc.MimeTypeVP9: {
		RTPCodecCapability: webrtc.RTPCodecCapability{
			MimeType:     webrtc.MimeTypeVP9,
			ClockRate:    90000,
			RTCPFeedback: []webrtc.RTCPFeedback{{Type: "goog-remb", Parameter: ""}, {Type: "ccm", Parameter: "fir"}, {Type: "nack", Parameter: ""}, {Type: "nack", Parameter: "pli"}},
		},
		PayloadType: 101,
	},
	webrtc.MimeTypeH264: {
		RTPCodecCapability: webrtc.RTPCodecCapability{
			MimeType:     webrtc.MimeTypeH264,
			ClockRate:    90000,
			RTCPFeedback: []webrtc.RTCPFeedback{{Type: "goog-remb", Parameter: ""}, {Type: "ccm", Parameter: "fir"}, {Type: "nack", Parameter: ""}, {Type: "nack", Parameter: "pli"}},
		},
		PayloadType: 102,
	},
	webrtc.MimeTypeH265: {
		RTPCodecCapability: webrtc.RTPCodecCapability{
			MimeType:     webrtc.MimeTypeH265,
			ClockRate:    90000,
			RTCPFeedback: []webrtc.RTCPFeedback{{Type: "goog-remb", Parameter: ""}, {Type: "ccm", Parameter: "fir"}, {Type: "nack", Parameter: ""}, {Type: "nack", Parameter: "pli"}},
		},
		PayloadType: 103,
	},
	webrtc.MimeTypeAV1: {
		RTPCodecCapability: webrtc.RTPCodecCapability{
			MimeType:     webrtc.MimeTypeAV1,
			ClockRate:    90000,
			RTCPFeedback: []webrtc.RTCPFeedback{{Type: "goog-remb", Parameter: ""}, {Type: "ccm", Parameter: "fir"}, {Type: "nack", Parameter: ""}, {Type: "nack", Parameter: "pli"}},
		},
		PayloadType: 104,
	},

	webrtc.MimeTypeOpus: {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeOpus, ClockRate: 48000, Channels: 2},
		PayloadType:        111,
	},
	"audio/AC3": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/AC3", ClockRate: 48000, Channels: 1},
		PayloadType:        112,
	},
	"audio/VORBIS": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/VORBIS", ClockRate: 90000, Channels: 1},
		PayloadType:        113,
	},
	"audio/AAC": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/AAC", ClockRate: 48000, Channels: 2},
		PayloadType:        114,
	},
	"audio/SPEEX": {
		RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: "audio/SPEEX", ClockRate: 48000, Channels: 1},
		PayloadType:        115,
	},
}

mirroring https://chromium.googlesource.com/external/webrtc/+/95eb1ba0db79d8fd134ae61b0a24648598684e8a/webrtc/media/engine/payload_type_mapper.cc#27

TODO: a better approach to this would be to list all supported codecs (including duplicates) and let WebRTC negotiate the codec then pass that to the transcoder. we will need to implement our own TrackLocal for this.

var SupportedCodecs = map[string]GStreamerParameters{
	webrtc.MimeTypeH264: {
		"rtph264depay", "video/x-raw,format=I420 ! x264enc speed-preset=ultrafast tune=zerolatency key-int-max=20", "rtph264pay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=H264,clock-rate=%d,payload=%d,packetization-mode=(string)1,profile-level-id=(string)42c028", c.ClockRate, c.PayloadType)
		},
	},
	webrtc.MimeTypeH265: {
		"rtph265depay", "video/x-raw,format=I420 ! x265enc speed-preset=ultrafast tune=zerolatency key-int-max=20", "rtph265pay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=H265,clock-rate=%d,payload=%d", c.ClockRate, c.PayloadType)
		},
	},
	webrtc.MimeTypeVP8: {
		"rtpvp8depay", "vp8enc", "rtpvp8pay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=VP8,clock-rate=%d,payload=%d", c.ClockRate, c.PayloadType)
		},
	},
	webrtc.MimeTypeVP9: {
		"rtpvp9depay", "vp9enc deadline=1", "rtpvp9pay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=VP9,clock-rate=%d,payload=%d", c.ClockRate, c.PayloadType)
		},
	},

	webrtc.MimeTypeOpus: {"rtpopusdepay", "opusenc inband-fec=true", "rtpopuspay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=OPUS,clock-rate=%d,payload=%d", c.ClockRate, c.PayloadType)
		},
	},
	"audio/AAC": {
		"rtpmp4adepay", "avenc_aac", "rtpmp4apay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=MP4A-LATM,clock-rate=%d,payload=%d,cpresent=(string)0,config=(string)40002320", c.ClockRate, c.PayloadType)
		},
	},
	"audio/SPEEX": {
		"rtpspeexdepay", "speexenc", "rtpspeexpay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=SPEEX,clock-rate=%d,payload=%d", c.ClockRate, c.PayloadType)
		},
	},
	webrtc.MimeTypeG722: {
		"rtpg722depay", "avenc_g722", "rtpg722pay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("clock-rate=%d,payload=%d", c.ClockRate, c.PayloadType)
		},
	},
	webrtc.MimeTypePCMA: {
		"rtppcmadepay", "alawenc", "rtppcmapay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=PCMA,clock-rate=%d,payload=%d", c.ClockRate, c.PayloadType)
		},
	},
	webrtc.MimeTypePCMU: {
		"rtppcmudepay", "mulawenc", "rtppcmupay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=PCMU,clock-rate=%d,payload=%d", c.ClockRate, c.PayloadType)
		},
	},
	"audio/AC3": {
		"rtpac3depay", "avenc_ac3", "rtpac3pay",
		func(c webrtc.RTPCodecParameters) string {
			return fmt.Sprintf("encoding-name=AC3,clock-rate=%d,payload=%d", c.ClockRate, c.PayloadType)
		},
	},
}

Functions

func NewTSPacketizer

func NewTSPacketizer(mtu uint16, payloader rtp.Payloader, sequencer rtp.Sequencer) rtp.Packetizer

NewTSPacketizer returns a new instance of a Packetizer for a specific payloader

func PipelineString

func PipelineString(from, to webrtc.RTPCodecParameters, encoder string) (string, error)

Types

type CodecMapping

type CodecMapping struct {
	GStreamerParameters
}

type GStreamerParameters

type GStreamerParameters struct {
	Depayloader, DefaultEncoder, Payloader string
	ToCaps                                 func(webrtc.RTPCodecParameters) string
}