Add pkt_size option fort RTSP server

pkg/h264/rtp.go

@@ -94,6 +94,10 @@ func RTPDepay(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc {
 }
 
 func RTPPay(mtu uint16, handler core.HandlerFunc) core.HandlerFunc {
+	if mtu == 0 {
+		mtu = 1472
+	}
+
 	payloader := &Payloader{IsAVC: true}
 	sequencer := rtp.NewRandomSequencer()
 	mtu -= 12 // rtp.Header size

pkg/h265/rtp.go

@@ -76,6 +76,10 @@ func RTPDepay(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc {
 }
 
 func RTPPay(mtu uint16, handler core.HandlerFunc) core.HandlerFunc {
+	if mtu == 0 {
+		mtu = 1472
+	}
+
 	payloader := &Payloader{}
 	sequencer := rtp.NewRandomSequencer()
 	mtu -= 12 // rtp.Header size

pkg/rtsp/conn.go

@@ -22,6 +22,7 @@ type Conn struct {
 	// public
 
 	Backchannel bool
+	PacketSize  uint16
 	SessionName string
 
 	Medias    []*core.Media

pkg/rtsp/consumer.go

@@ -104,14 +104,23 @@ func (c *Conn) packetWriter(codec *core.Codec, channel, payloadType uint8) core.
 	if !codec.IsRTP() {
 		switch codec.Name {
 		case core.CodecH264:
-			handlerFunc = h264.RTPPay(1500, handlerFunc)
+			handlerFunc = h264.RTPPay(c.PacketSize, handlerFunc)
 		case core.CodecH265:
-			handlerFunc = h265.RTPPay(1500, handlerFunc)
+			handlerFunc = h265.RTPPay(c.PacketSize, handlerFunc)
 		case core.CodecAAC:
 			handlerFunc = aac.RTPPay(handlerFunc)
 		case core.CodecJPEG:
 			handlerFunc = mjpeg.RTPPay(handlerFunc)
 		}
+	} else if c.PacketSize != 0 {
+		switch codec.Name {
+		case core.CodecH264:
+			handlerFunc = h264.RTPPay(c.PacketSize, handlerFunc)
+			handlerFunc = h264.RTPDepay(codec, handlerFunc)
+		case core.CodecH265:
+			handlerFunc = h265.RTPPay(c.PacketSize, handlerFunc)
+			handlerFunc = h265.RTPDepay(codec, handlerFunc)
+		}
 	}
 
 	return handlerFunc

pkg/webrtc/api.go

@@ -9,6 +9,7 @@ import (
 )
 
 // ReceiveMTU = Ethernet MTU (1500) - IP Header (20) - UDP Header (8)
+// https://ffmpeg.org/ffmpeg-all.html#Muxer
 const ReceiveMTU = 1472
 
 func NewAPI(address string) (*webrtc.API, error) {