support detecting LPCM formats with payload types 10 and 11 (#496)

README.md

@@ -103,7 +103,7 @@ In RTSP, media streams are routed between server and clients by using RTP packet
 
 ### Video
 
-|format|documentation|encoder and decoder available|
+|codec|documentation|encoder and decoder available|
 |------|-------------|-----------------------------|
 |AV1|[link](https://pkg.go.dev/github.com/bluenviron/gortsplib/v4/pkg/format#AV1)|:heavy_check_mark:|
 |VP9|[link](https://pkg.go.dev/github.com/bluenviron/gortsplib/v4/pkg/format#VP9)|:heavy_check_mark:|
@@ -116,7 +116,7 @@ In RTSP, media streams are routed between server and clients by using RTP packet
 
 ### Audio
 
-|format|documentation|encoder and decoder available|
+|codec|documentation|encoder and decoder available|
 |------|-------------|-----------------------------|
 |Opus|[link](https://pkg.go.dev/github.com/bluenviron/gortsplib/v4/pkg/format#Opus)|:heavy_check_mark:|
 |Vorbis|[link](https://pkg.go.dev/github.com/bluenviron/gortsplib/v4/pkg/format#Vorbis)||
@@ -131,7 +131,7 @@ In RTSP, media streams are routed between server and clients by using RTP packet
 
 ### Other
 
-|format|documentation|encoder and decoder available|
+|codec|documentation|encoder and decoder available|
 |------|-------------|-----------------------------|
 |MPEG-TS|[link](https://pkg.go.dev/github.com/bluenviron/gortsplib/v4/pkg/format#MPEGTS)||
 
@@ -155,7 +155,7 @@ In RTSP, media streams are routed between server and clients by using RTP packet
 |[RFC4184, RTP Payload Format for AC-3 Audio](https://datatracker.ietf.org/doc/html/rfc4184)|AC-3 payload format|
 |[RFC6416, RTP Payload Format for MPEG-4 Audio/Visual Streams](https://datatracker.ietf.org/doc/html/rfc6416)|MPEG-4 audio payload format|
 |[RFC5574, RTP Payload Format for the Speex Codec](https://datatracker.ietf.org/doc/html/rfc5574)|Speex payload format|
-|[RFC3551, RTP Profile for Audio and Video Conferences with Minimal Control](https://datatracker.ietf.org/doc/html/rfc3551)|G726, G722, G711 payload formats|
+|[RFC3551, RTP Profile for Audio and Video Conferences with Minimal Control](https://datatracker.ietf.org/doc/html/rfc3551)|G726, G722, G711, LPCM payload formats|
 |[RFC3190, RTP Payload Format for 12-bit DAT Audio and 20- and 24-bit Linear Sampled Audio](https://datatracker.ietf.org/doc/html/rfc3190)|LPCM payload format|
 |[Codec specifications](https://github.com/bluenviron/mediacommon#specifications)|codecs|
 |[Golang project layout](https://github.com/golang-standards/project-layout)|project layout|

pkg/format/ac3.go

@@ -9,7 +9,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpac3"
 )
 
-// AC3 is a RTP format for the AC-3 codec.
+// AC3 is the RTP format for the AC-3 codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc4184
 type AC3 struct {
 	PayloadTyp   uint8

pkg/format/av1.go

@@ -9,7 +9,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpav1"
 )
 
-// AV1 is a RTP format for the AV1 codec.
+// AV1 is the RTP format for the AV1 codec.
 // Specification: https://aomediacodec.github.io/av1-rtp-spec/
 type AV1 struct {
 	PayloadTyp uint8

pkg/format/format.go

@@ -55,25 +55,11 @@ func Unmarshal(mediaType string, payloadType uint8, rtpMap string, fmtp map[stri
 
 	format := func() Format {
 		switch {
-		// video
-
-		case codec == "av1" && clock == "90000":
-			return &AV1{}
-
-		case codec == "vp9" && clock == "90000":
-			return &VP9{}
-
-		case codec == "vp8" && clock == "90000":
-			return &VP8{}
+		/*
+		* static payload types
+		**/
 
-		case codec == "h265" && clock == "90000":
-			return &H265{}
-
-		case codec == "h264" && clock == "90000":
-			return &H264{}
-
-		case codec == "mp4v-es" && clock == "90000":
-			return &MPEG4Video{}
+		// video
 
 		case payloadType == 32:
 			return &MPEG1Video{}
@@ -86,42 +72,74 @@ func Unmarshal(mediaType string, payloadType uint8, rtpMap string, fmtp map[stri
 
 		// audio
 
-		case codec == "opus":
-			return &Opus{}
-
-		case codec == "vorbis":
-			return &Vorbis{}
-
-		case codec == "mpeg4-generic", codec == "mp4a-latm":
-			return &MPEG4Audio{}
-
 		case payloadType == 14:
 			return &MPEG1Audio{}
 
-		case codec == "ac3":
-			return &AC3{}
-
-		case codec == "speex":
-			return &Speex{}
-
-		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 == 9:
 			return &G722{}
 
 		case payloadType == 0, payloadType == 8:
 			return &G711{}
 
-		case codec == "l8", codec == "l16", codec == "l24":
+		case payloadType == 10, payloadType == 11:
 			return &LPCM{}
+
+		/*
+		* dynamic payload types
+		**/
+
+		case payloadType >= 96 && payloadType <= 127:
+			switch {
+			// video
+
+			case codec == "av1" && clock == "90000":
+				return &AV1{}
+
+			case codec == "vp9" && clock == "90000":
+				return &VP9{}
+
+			case codec == "vp8" && clock == "90000":
+				return &VP8{}
+
+			case codec == "h265" && clock == "90000":
+				return &H265{}
+
+			case codec == "h264" && clock == "90000":
+				return &H264{}
+
+			case codec == "mp4v-es" && clock == "90000":
+				return &MPEG4Video{}
+
+			// audio
+
+			case codec == "opus":
+				return &Opus{}
+
+			case codec == "vorbis":
+				return &Vorbis{}
+
+			case codec == "mpeg4-generic", codec == "mp4a-latm":
+				return &MPEG4Audio{}
+
+			case codec == "ac3":
+				return &AC3{}
+
+			case codec == "speex":
+				return &Speex{}
+
+			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 codec == "l8", codec == "l16", codec == "l24":
+				return &LPCM{}
+			}
 		}
 
 		return &Generic{}

pkg/format/format_test.go

@@ -154,6 +154,36 @@ var casesFormat = []struct {
 		"L16/96000/2",
 		nil,
 	},
+	{
+		"audio lpcm 16 rfc3551 stereo",
+		"audio",
+		10,
+		"",
+		nil,
+		&LPCM{
+			PayloadTyp:   10,
+			BitDepth:     16,
+			SampleRate:   44100,
+			ChannelCount: 2,
+		},
+		"L16/44100/2",
+		nil,
+	},
+	{
+		"audio lpcm 16 rfc3551 mono",
+		"audio",
+		11,
+		"",
+		nil,
+		&LPCM{
+			PayloadTyp:   11,
+			BitDepth:     16,
+			SampleRate:   44100,
+			ChannelCount: 1,
+		},
+		"L16/44100/1",
+		nil,
+	},
 	{
 		"audio lpcm 16 with no explicit channel",
 		"audio",

pkg/format/g711.go

@@ -6,7 +6,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpsimpleaudio"
 )
 
-// G711 is a RTP format for the G711 codec, encoded with mu-law or A-law.
+// G711 is the RTP format for the G711 codec, encoded with mu-law or A-law.
 // Specification: https://datatracker.ietf.org/doc/html/rfc3551
 type G711 struct {
 	// whether to use mu-law. Otherwise, A-law is used.

pkg/format/g722.go

@@ -6,7 +6,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpsimpleaudio"
 )
 
-// G722 is a RTP format for the G722 codec.
+// G722 is the RTP format for the G722 codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc3551
 type G722 struct{}
 

pkg/format/g726.go

@@ -7,7 +7,7 @@ import (
 	"github.com/pion/rtp"
 )
 
-// G726 is a RTP format for the G726 codec.
+// G726 is the RTP format for the G726 codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc3551
 type G726 struct {
 	PayloadTyp uint8

pkg/format/h264.go

@@ -15,7 +15,7 @@ import (
 	"github.com/bluenviron/mediacommon/pkg/codecs/h264"
 )
 
-// H264 is a RTP format for the H264 codec.
+// H264 is the RTP format for the H264 codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc6184
 type H264 struct {
 	PayloadTyp        uint8

pkg/format/h265.go

@@ -13,7 +13,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtph265"
 )
 
-// H265 is a RTP format for the H265 codec.
+// H265 is the RTP format for the H265 codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc7798
 type H265 struct {
 	PayloadTyp uint8

pkg/format/lpcm.go

@@ -9,8 +9,9 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtplpcm"
 )
 
-// LPCM is a RTP format for the uncompressed, Linear PCM codec.
+// LPCM is the RTP format for the LPCM codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc3190
+// Specification: https://datatracker.ietf.org/doc/html/rfc3551
 type LPCM struct {
 	PayloadTyp   uint8
 	BitDepth     int
@@ -21,6 +22,20 @@ type LPCM struct {
 func (f *LPCM) unmarshal(ctx *unmarshalContext) error {
 	f.PayloadTyp = ctx.payloadType
 
+	if ctx.payloadType == 10 {
+		f.BitDepth = 16
+		f.SampleRate = 44100
+		f.ChannelCount = 2
+		return nil
+	}
+
+	if ctx.payloadType == 11 {
+		f.BitDepth = 16
+		f.SampleRate = 44100
+		f.ChannelCount = 1
+		return nil
+	}
+
 	switch ctx.codec {
 	case "l8":
 		f.BitDepth = 8

pkg/format/mjpeg.go

@@ -6,7 +6,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpmjpeg"
 )
 
-// MJPEG is a RTP format for the Motion-JPEG codec.
+// MJPEG is the RTP format for the Motion-JPEG codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc2435
 type MJPEG struct{}
 

pkg/format/mpeg1_audio.go

@@ -6,7 +6,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpmpeg1audio"
 )
 
-// MPEG1Audio is a RTP format for a MPEG-1/2 Audio codec.
+// MPEG1Audio is the RTP format for a MPEG-1/2 Audio codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc2250
 type MPEG1Audio struct{}
 

pkg/format/mpeg1_video.go

@@ -6,7 +6,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpmpeg1video"
 )
 
-// MPEG1Video is a RTP format for a MPEG-1/2 Video codec.
+// MPEG1Video is the RTP format for a MPEG-1/2 Video codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc2250
 type MPEG1Video struct{}
 

pkg/format/mpeg4_audio.go

@@ -12,14 +12,14 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpmpeg4audio"
 )
 
-// MPEG4Audio is a RTP format for a MPEG-4 Audio codec.
+// MPEG4Audio is the RTP format for a MPEG-4 Audio codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc3640
 // Specification: https://datatracker.ietf.org/doc/html/rfc6416#section-7.3
 type MPEG4Audio struct {
 	// payload type of packets.
 	PayloadTyp uint8
 
-	// use RFC6416 (LATM) instead of RFC3640 (generic).
+	// use LATM format (RFC6416) instead of generic format (RFC3640).
 	LATM bool
 
 	// profile level ID.

pkg/format/mpeg4_video.go

@@ -13,7 +13,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpmpeg4video"
 )
 
-// MPEG4Video is a RTP format for a MPEG-4 Video codec.
+// MPEG4Video is the RTP format for a MPEG-4 Video codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc6416#section-7.1
 type MPEG4Video struct {
 	PayloadTyp     uint8

pkg/format/mpegts.go

@@ -4,7 +4,7 @@ import (
 	"github.com/pion/rtp"
 )
 
-// MPEGTS is a RTP format for MPEG-TS.
+// MPEGTS is the RTP format for MPEG-TS.
 // Specification: https://datatracker.ietf.org/doc/html/rfc2250
 type MPEGTS struct{}
 

pkg/format/opus.go

@@ -10,7 +10,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpsimpleaudio"
 )
 
-// Opus is a RTP format for the Opus codec.
+// Opus is the RTP format for the Opus codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc7587
 type Opus struct {
 	PayloadTyp uint8

pkg/format/speex.go

@@ -7,7 +7,7 @@ import (
 	"github.com/pion/rtp"
 )
 
-// Speex is a RTP format for the Speex codec.
+// Speex is the RTP format for the Speex codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc5574
 type Speex struct {
 	PayloadTyp uint8

pkg/format/vorbis.go

@@ -9,7 +9,7 @@ import (
 	"github.com/pion/rtp"
 )
 
-// Vorbis is a RTP format for the Vorbis codec.
+// Vorbis is the RTP format for the Vorbis codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc5215
 type Vorbis struct {
 	PayloadTyp    uint8

pkg/format/vp8.go

@@ -9,7 +9,7 @@ import (
 	"github.com/bluenviron/gortsplib/v4/pkg/format/rtpvp8"
 )
 
-// VP8 is a RTP format for the VP8 codec.
+// VP8 is the RTP format for the VP8 codec.
 // Specification: https://datatracker.ietf.org/doc/html/rfc7741
 type VP8 struct {
 	PayloadTyp uint8