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format.go
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format.go
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// Package formats contains RTP format definitions, decoders and encoders.
package formats
import (
"strings"
"github.com/pion/rtp"
)
func getCodecAndClock(rtpMap string) (string, string) {
parts2 := strings.SplitN(rtpMap, "/", 2)
if len(parts2) != 2 {
return "", ""
}
return strings.ToLower(parts2[0]), parts2[1]
}
type unmarshalContext struct {
mediaType string
payloadType uint8
clock string
codec string
rtpMap string
fmtp map[string]string
}
// Format is a media format.
// It defines the payload type of RTP packets and how to encode/decode them.
type Format interface {
unmarshal(ctx *unmarshalContext) error
// Codec returns the codec name.
Codec() string
// Deprecated: replaced by Codec().
String() string
// ClockRate returns the clock rate.
ClockRate() int
// PayloadType returns the payload type.
PayloadType() uint8
// RTPMap returns the rtpmap attribute.
RTPMap() string
// FMTP returns the fmtp attribute.
FMTP() map[string]string
// PTSEqualsDTS checks whether PTS is equal to DTS in RTP packets.
PTSEqualsDTS(*rtp.Packet) bool
}
// Unmarshal decodes a format from a media description.
func Unmarshal(mediaType string, payloadType uint8, rtpMap string, fmtp map[string]string) (Format, error) {
codec, clock := getCodecAndClock(rtpMap)
format := func() Format {
switch {
// video
case payloadType == 26:
return &MJPEG{}
case payloadType == 32:
return &MPEG1Video{}
case payloadType == 33:
return &MPEGTS{}
case codec == "mp4v-es" && clock == "90000":
return &MPEG4Video{}
case codec == "h264" && clock == "90000":
return &H264{}
case codec == "h265" && clock == "90000":
return &H265{}
case codec == "vp8" && clock == "90000":
return &VP8{}
case codec == "vp9" && clock == "90000":
return &VP9{}
case codec == "av1" && clock == "90000":
return &AV1{}
// audio
case payloadType == 0, payloadType == 8:
return &G711{}
case payloadType == 9:
return &G722{}
case (codec == "g726-16" ||
codec == "g726-24" ||
codec == "g726-32" ||
codec == "g726-40" ||
codec == "aal2-g726-16" ||
codec == "aal2-g726-24" ||
codec == "aal2-g726-32" ||
codec == "aal2-g726-40") && clock == "8000":
return &G726{}
case payloadType == 14:
return &MPEG1Audio{}
case codec == "l8", codec == "l16", codec == "l24":
return &LPCM{}
case codec == "mpeg4-generic":
return &MPEG4AudioGeneric{}
case codec == "mp4a-latm":
return &MPEG4AudioLATM{}
case codec == "speex":
return &Speex{}
case codec == "vorbis":
return &Vorbis{}
case codec == "opus":
return &Opus{}
}
return &Generic{}
}()
err := format.unmarshal(&unmarshalContext{
mediaType: mediaType,
payloadType: payloadType,
clock: clock,
codec: codec,
rtpMap: rtpMap,
fmtp: fmtp,
})
if err != nil {
return nil, err
}
return format, nil
}