support publishing H265 and AV1 tracks with Enhanced RTMP (#1393) (#1446) (#1621) (#1756)

internal/rtmp/message/user_control_stream_begin.go

@@ -0,0 +1,45 @@
+package message //nolint:dupl
+
+import (
+	"fmt"
+
+	"github.com/aler9/mediamtx/internal/rtmp/rawmessage"
+)
+
+// UserControlStreamBegin is a user control message.
+type UserControlStreamBegin struct {
+	StreamID uint32
+}
+
+// Unmarshal implements Message.
+func (m *UserControlStreamBegin) Unmarshal(raw *rawmessage.Message) error {
+	if raw.ChunkStreamID != ControlChunkStreamID {
+		return fmt.Errorf("unexpected chunk stream ID")
+	}
+
+	if len(raw.Body) != 6 {
+		return fmt.Errorf("invalid body size")
+	}
+
+	m.StreamID = uint32(raw.Body[2])<<24 | uint32(raw.Body[3])<<16 | uint32(raw.Body[4])<<8 | uint32(raw.Body[5])
+
+	return nil
+}
+
+// Marshal implements Message.
+func (m UserControlStreamBegin) Marshal() (*rawmessage.Message, error) {
+	buf := make([]byte, 6)
+
+	buf[0] = byte(UserControlTypeStreamBegin >> 8)
+	buf[1] = byte(UserControlTypeStreamBegin)
+	buf[2] = byte(m.StreamID >> 24)
+	buf[3] = byte(m.StreamID >> 16)
+	buf[4] = byte(m.StreamID >> 8)
+	buf[5] = byte(m.StreamID)
+
+	return &rawmessage.Message{
+		ChunkStreamID: ControlChunkStreamID,
+		Type:          uint8(TypeUserControl),
+		Body:          buf,
+	}, nil
+}