restore Windows compatibility (#4860)

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/alecthomas/kong v1.12.1
 	github.com/asticode/go-astits v1.13.0
 	github.com/bluenviron/gohlslib/v2 v2.2.2
-	github.com/bluenviron/gortsplib/v4 v4.16.1
+	github.com/bluenviron/gortsplib/v4 v4.16.2
 	github.com/bluenviron/mediacommon/v2 v2.4.1
 	github.com/datarhei/gosrt v0.9.0
 	github.com/fsnotify/fsnotify v1.9.0

go.sum

@@ -35,8 +35,8 @@ github.com/benburkert/openpgp v0.0.0-20160410205803-c2471f86866c h1:8XZeJrs4+ZYh
 github.com/benburkert/openpgp v0.0.0-20160410205803-c2471f86866c/go.mod h1:x1vxHcL/9AVzuk5HOloOEPrtJY0MaalYr78afXZ+pWI=
 github.com/bluenviron/gohlslib/v2 v2.2.2 h1:Q86VloPjwONKF8pu6jSEh9ENm4UzdMl5SzYvtjneL5k=
 github.com/bluenviron/gohlslib/v2 v2.2.2/go.mod h1:3Lby/VMDD/cN0B3uJPd3bEEiJZ34LqXs71FEvN/fq2k=
-github.com/bluenviron/gortsplib/v4 v4.16.1 h1:1uqWp+0we2OKp/fWaWXhBSpqdhEtZSk7g96nAA3iayk=
-github.com/bluenviron/gortsplib/v4 v4.16.1/go.mod h1:Vm07yUMys9XKnuZJLfTT8zluAN2n9ZOtz40Xb8RKh+8=
+github.com/bluenviron/gortsplib/v4 v4.16.2 h1:10HaMsorjW13gscLp3R7Oj41ck2i1EHIUYCNWD2wpkI=
+github.com/bluenviron/gortsplib/v4 v4.16.2/go.mod h1:Vm07yUMys9XKnuZJLfTT8zluAN2n9ZOtz40Xb8RKh+8=
 github.com/bluenviron/mediacommon/v2 v2.4.1 h1:PsKrO/c7hDjXxiOGRUBsYtMGNb4lKWIFea6zcOchoVs=
 github.com/bluenviron/mediacommon/v2 v2.4.1/go.mod h1:a6MbPmXtYda9mKibKVMZlW20GYLLrX2R7ZkUE+1pwV0=
 github.com/bytedance/sonic v1.13.2 h1:8/H1FempDZqC4VqjptGo14QQlJx8VdZJegxs6wwfqpQ=

internal/protocols/udp/udp.go

@@ -9,50 +9,16 @@ import (
 	"time"
 
 	"github.com/bluenviron/gortsplib/v4/pkg/multicast"
+	"github.com/bluenviron/gortsplib/v4/pkg/readbuffer"
 	"github.com/bluenviron/mediamtx/internal/restrictnetwork"
 )
 
 type packetConn interface {
 	net.PacketConn
+	SetReadBuffer(bytes int) error
 	SyscallConn() (syscall.RawConn, error)
 }
 
-func setAndVerifyReadBufferSize(pc packetConn, v int) error {
-	rawConn, err := pc.SyscallConn()
-	if err != nil {
-		panic(err)
-	}
-
-	var err2 error
-
-	err = rawConn.Control(func(fd uintptr) {
-		err2 = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_RCVBUF, v)
-		if err2 != nil {
-			return
-		}
-
-		var v2 int
-		v2, err2 = syscall.GetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_RCVBUF)
-		if err2 != nil {
-			return
-		}
-
-		if v2 != (v * 2) {
-			err2 = fmt.Errorf("unable to set read buffer size to %v - check that net.core.rmem_max is greater than %v", v, v)
-			return
-		}
-	})
-	if err != nil {
-		return err
-	}
-
-	if err2 != nil {
-		return err2
-	}
-
-	return nil
-}
-
 type udpConn struct {
 	pc       net.PacketConn
 	sourceIP net.IP
@@ -184,11 +150,24 @@ func CreateConn(u *url.URL, udpReadBufferSize int) (net.Conn, error) {
 	}
 
 	if udpReadBufferSize != 0 {
-		err = setAndVerifyReadBufferSize(pc, udpReadBufferSize)
+		err = pc.SetReadBuffer(udpReadBufferSize)
 		if err != nil {
 			pc.Close()
 			return nil, err
 		}
+
+		var v int
+		v, err = readbuffer.ReadBuffer(pc)
+		if err != nil {
+			pc.Close()
+			return nil, err
+		}
+
+		if v != udpReadBufferSize {
+			pc.Close()
+			return nil, fmt.Errorf("unable to set read buffer size to %v, check that the operating system allows that",
+				udpReadBufferSize)
+		}
 	}
 
 	return &udpConn{pc: pc, sourceIP: sourceIP}, nil