Copy PaddingSize from rtp.Packet to Header

Author: sirzooro

track_local_static.go

@@ -194,6 +194,11 @@ func (s *TrackLocalStaticRTP) writeRTP(packet *rtp.Packet) error {
 	for _, b := range s.bindings {
 		packet.Header.SSRC = uint32(b.ssrc)
 		packet.Header.PayloadType = uint8(b.payloadType)
+		// b.writeStream.WriteRTP below expects header and payload separately, so value of Packet.PaddingSize
+		// would be lost. Copy it to Packet.Header.PaddingSize to avoid that problem.
+		if packet.PaddingSize != 0 && packet.Header.PaddingSize == 0 {
+			packet.Header.PaddingSize = packet.PaddingSize
+		}
 		if _, err := b.writeStream.WriteRTP(&packet.Header, packet.Payload); err != nil {
 			writeErrs = append(writeErrs, err)
 		}

track_local_static_test.go

@@ -323,6 +323,7 @@ func Test_TrackLocalStatic_Padding(t *testing.T) {
 			assert.NoError(t, e)
 			assert.True(t, p.Padding)
 			assert.Equal(t, p.PaddingSize, byte(255))
+			assert.Equal(t, p.Header.PaddingSize, byte(255))
 		}
 
 		onTrackFiredFunc()