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

internal/rtmp/message/extended_coded_frames.go

@@ -0,0 +1,71 @@
+package message
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/aler9/mediamtx/internal/rtmp/rawmessage"
+)
+
+// ExtendedCodedFrames is a CodedFrames extended message.
+type ExtendedCodedFrames struct {
+	ChunkStreamID   byte
+	DTS             time.Duration
+	MessageStreamID uint32
+	FourCC          [4]byte
+	PTSDelta        time.Duration
+	Payload         []byte
+}
+
+// Unmarshal implements Message.
+func (m *ExtendedCodedFrames) Unmarshal(raw *rawmessage.Message) error {
+	if len(raw.Body) < 8 {
+		return fmt.Errorf("not enough bytes")
+	}
+
+	m.ChunkStreamID = raw.ChunkStreamID
+	m.DTS = raw.Timestamp
+	m.MessageStreamID = raw.MessageStreamID
+	copy(m.FourCC[:], raw.Body[1:5])
+
+	if m.FourCC == FourCCHEVC {
+		m.PTSDelta = time.Duration(uint32(raw.Body[5])<<16|uint32(raw.Body[6])<<8|uint32(raw.Body[7])) * time.Millisecond
+		m.Payload = raw.Body[8:]
+	} else {
+		m.Payload = raw.Body[5:]
+	}
+
+	return nil
+}
+
+// Marshal implements Message.
+func (m ExtendedCodedFrames) Marshal() (*rawmessage.Message, error) {
+	var l int
+	if m.FourCC == FourCCHEVC {
+		l = 8 + len(m.Payload)
+	} else {
+		l = 5 + len(m.Payload)
+	}
+	body := make([]byte, l)
+
+	body[0] = 0b10000000 | byte(ExtendedTypeCodedFrames)
+	copy(body[1:5], m.FourCC[:])
+
+	if m.FourCC == FourCCHEVC {
+		tmp := uint32(m.PTSDelta / time.Millisecond)
+		body[5] = uint8(tmp >> 16)
+		body[6] = uint8(tmp >> 8)
+		body[7] = uint8(tmp)
+		copy(body[8:], m.Payload)
+	} else {
+		copy(body[5:], m.Payload)
+	}
+
+	return &rawmessage.Message{
+		ChunkStreamID:   m.ChunkStreamID,
+		Timestamp:       m.DTS,
+		Type:            uint8(TypeVideo),
+		MessageStreamID: m.MessageStreamID,
+		Body:            body,
+	}, nil
+}