rtsp-simple-server/internal/rtmp/message/extended_frames_x.go

package message

import (
	"fmt"
	"time"

	"github.com/bluenviron/mediamtx/internal/rtmp/rawmessage"
)

// ExtendedFramesX is a FramesX extended message.
type ExtendedFramesX struct {
	ChunkStreamID   byte
	DTS             time.Duration
	MessageStreamID uint32
	FourCC          FourCC
	Payload         []byte
}

// Unmarshal implements Message.
func (m *ExtendedFramesX) Unmarshal(raw *rawmessage.Message) error {
	if len(raw.Body) < 6 {
		return fmt.Errorf("not enough bytes")
	}

	m.ChunkStreamID = raw.ChunkStreamID
	m.DTS = raw.Timestamp
	m.MessageStreamID = raw.MessageStreamID
	m.FourCC = FourCC(raw.Body[1])<<24 | FourCC(raw.Body[2])<<16 | FourCC(raw.Body[3])<<8 | FourCC(raw.Body[4])
	m.Payload = raw.Body[5:]

	return nil
}

func (m ExtendedFramesX) marshalBodySize() int {
	return 5 + len(m.Payload)
}

// Marshal implements Message.
func (m ExtendedFramesX) Marshal() (*rawmessage.Message, error) {
	body := make([]byte, m.marshalBodySize())

	body[0] = 0b10000000 | byte(ExtendedTypeFramesX)
	body[1] = uint8(m.FourCC >> 24)
	body[2] = uint8(m.FourCC >> 16)
	body[3] = uint8(m.FourCC >> 8)
	body[4] = uint8(m.FourCC)
	copy(body[5:], m.Payload)

	return &rawmessage.Message{
		ChunkStreamID:   m.ChunkStreamID,
		Timestamp:       m.DTS,
		Type:            uint8(TypeVideo),
		MessageStreamID: m.MessageStreamID,
		Body:            body,
	}, nil
}