Fix timestamps for RTMP client

pkg/rtmp/README.md

@@ -16,4 +16,5 @@ response []interface {}{"onStatus", 0, interface {}(nil), map[string]interface {
 
 - https://en.wikipedia.org/wiki/Flash_Video
 - https://en.wikipedia.org/wiki/Real-Time_Messaging_Protocol
-- https://rtmp.veriskope.com/pdf/rtmp_specification_1.0.pdf
+- https://rtmp.veriskope.com/pdf/rtmp_specification_1.0.pdf
+- https://rtmp.veriskope.com/docs/spec/

pkg/rtmp/client.go

@@ -65,7 +65,7 @@ func NewClient(conn net.Conn, u *url.URL) (*Conn, error) {
 		rd:   bufio.NewReaderSize(conn, core.BufferSize),
 		wr:   conn,
 
-		chunks: map[uint8]*header{},
+		chunks: map[uint8]*chunk{},
 
 		rdPacketSize: 128,
 		wrPacketSize: 4096, // OBS - 4096, Reolink - 4096

pkg/rtmp/conn.go

@@ -29,7 +29,7 @@ type Conn struct {
 	rdPacketSize uint32
 	wrPacketSize uint32
 
-	chunks   map[byte]*header
+	chunks   map[byte]*chunk
 	streamID byte
 	url      string
 
@@ -66,11 +66,59 @@ func (c *Conn) readResponse(transID float64) ([]any, error) {
 	}
 }
 
-type header struct {
-	timeMS   uint32
+type chunk struct {
+	conn     *Conn
+	rawTime  uint32
 	dataSize uint32
 	tagType  byte
 	streamID uint32
+	timeMS   uint32
+}
+
+func (c *chunk) readHeader(typ byte) error {
+	switch typ {
+	case 0: // 12 byte header (full header)
+		b, err := c.conn.readSize(11)
+		if err != nil {
+			return err
+		}
+		c.rawTime = Uint24(b)
+		c.dataSize = Uint24(b[3:])
+		c.tagType = b[6]
+		c.streamID = binary.LittleEndian.Uint32(b[7:])
+		c.timeMS = c.readExtendedTime()
+
+	case 1: // 8 bytes - like type b00, not including message ID (4 last bytes)
+		b, err := c.conn.readSize(7)
+		if err != nil {
+			return err
+		}
+		c.rawTime = Uint24(b)
+		c.dataSize = Uint24(b[3:]) // msgdatalen
+		c.tagType = b[6]           // msgtypeid
+		c.timeMS += c.readExtendedTime()
+
+	case 2: // 4 bytes - Basic Header and timestamp (3 bytes) are included
+		b, err := c.conn.readSize(3)
+		if err != nil {
+			return err
+		}
+		c.rawTime = Uint24(b) // timestamp
+		c.timeMS += c.readExtendedTime()
+
+	case 3: // 1 byte - only the Basic Header is included
+		// use here hdr from previous msg with same session ID (sid)
+	}
+	return nil
+}
+
+func (c *chunk) readExtendedTime() uint32 {
+	if c.rawTime == 0xFFFFFF {
+		if b, err := c.conn.readSize(4); err == nil {
+			return binary.BigEndian.Uint32(b)
+		}
+	}
+	return c.rawTime
 }
 
 //var ErrNotImplemented = errors.New("rtmp: not implemented")
@@ -85,93 +133,57 @@ func (c *Conn) readMessage() (byte, uint32, []byte, error) {
 	chunkID := b[0] & 0b111111
 
 	// storing header information for support header type 3
-	hdr, ok := c.chunks[chunkID]
+	ch, ok := c.chunks[chunkID]
 	if !ok {
-		hdr = &header{}
-		c.chunks[chunkID] = hdr
+		ch = &chunk{conn: c}
+		c.chunks[chunkID] = ch
 	}
 
-	switch hdrType {
-	case 0: // 12 byte header (full header)
-		if b, err = c.readSize(11); err != nil {
-			return 0, 0, nil, err
-		}
-		_ = b[7]
-		hdr.timeMS = Uint24(b)
-		hdr.dataSize = Uint24(b[3:])
-		hdr.tagType = b[6]
-		hdr.streamID = binary.LittleEndian.Uint32(b[7:])
-
-	case 1: // 8 bytes - like type b00, not including message ID (4 last bytes)
-		if b, err = c.readSize(7); err != nil {
-			return 0, 0, nil, err
-		}
-		_ = b[6]
-		hdr.timeMS = Uint24(b)       // timestamp
-		hdr.dataSize = Uint24(b[3:]) // msgdatalen
-		hdr.tagType = b[6]           // msgtypeid
-
-	case 2: // 4 bytes - Basic Header and timestamp (3 bytes) are included
-		if b, err = c.readSize(3); err != nil {
-			return 0, 0, nil, err
-		}
-		hdr.timeMS = Uint24(b) // timestamp
-
-	case 3: // 1 byte - only the Basic Header is included
-		// use here hdr from previous msg with same session ID (sid)
-	}
-
-	timeMS := hdr.timeMS
-	if timeMS == 0xFFFFFF {
-		if b, err = c.readSize(4); err != nil {
-			return 0, 0, nil, err
-		}
-		timeMS = binary.BigEndian.Uint32(b)
+	if err = ch.readHeader(hdrType); err != nil {
+		return 0, 0, nil, err
 	}
 
-	//log.Printf("[rtmp] hdr=%d chunkID=%d timeMS=%d size=%d tagType=%d streamID=%d", hdrType, chunkID, hdr.timeMS, hdr.dataSize, hdr.tagType, hdr.streamID)
+	//log.Printf("[rtmp] hdr=%d chunkID=%d timeMS=%d size=%d tagType=%d streamID=%d", hdrType, chunkID, ch.timeMS, ch.dataSize, ch.tagType, ch.streamID)
 
 	// 1. Response zero size
-	if hdr.dataSize == 0 {
-		return hdr.tagType, timeMS, nil, nil
+	if ch.dataSize == 0 {
+		return ch.tagType, ch.timeMS, nil, nil
 	}
 
-	b = make([]byte, hdr.dataSize)
+	data := make([]byte, ch.dataSize)
 
 	// 2. Response small packet
-	if hdr.dataSize <= c.rdPacketSize {
-		if _, err = io.ReadFull(c.rd, b); err != nil {
+	if ch.dataSize <= c.rdPacketSize {
+		if _, err = io.ReadFull(c.rd, data); err != nil {
 			return 0, 0, nil, err
 		}
-		return hdr.tagType, timeMS, b, nil
+		return ch.tagType, ch.timeMS, data, nil
 	}
 
 	// 3. Response big packet
 	var i0 uint32
-	for i1 := c.rdPacketSize; i1 < hdr.dataSize; i1 += c.rdPacketSize {
-		if _, err = io.ReadFull(c.rd, b[i0:i1]); err != nil {
+	for i1 := c.rdPacketSize; i1 < ch.dataSize; i1 += c.rdPacketSize {
+		if _, err = io.ReadFull(c.rd, data[i0:i1]); err != nil {
 			return 0, 0, nil, err
 		}
 
+		// hopefully this will be hdrType=3 with same chunkID
 		if _, err = c.readSize(1); err != nil {
 			return 0, 0, nil, err
 		}
 
-		if hdr.timeMS == 0xFFFFFF {
-			if _, err = c.readSize(4); err != nil {
-				return 0, 0, nil, err
-			}
-		}
+		_ = ch.readExtendedTime()
 
 		i0 = i1
 	}
 
-	if _, err = io.ReadFull(c.rd, b[i0:]); err != nil {
+	if _, err = io.ReadFull(c.rd, data[i0:]); err != nil {
 		return 0, 0, nil, err
 	}
 
-	return hdr.tagType, timeMS, b, nil
+	return ch.tagType, ch.timeMS, data, nil
 }
+
 func (c *Conn) writeMessage(chunkID, tagType byte, timeMS uint32, payload []byte) error {
 	c.mu.Lock()
 	c.resetBuffer()
@@ -324,7 +336,7 @@ func (c *Conn) writePlay() error {
 
 func (c *Conn) readSize(n uint32) ([]byte, error) {
 	b := make([]byte, n)
-	if _, err := io.ReadAtLeast(c.rd, b, int(n)); err != nil {
+	if _, err := io.ReadFull(c.rd, b); err != nil {
 		return nil, err
 	}
 	return b, nil

pkg/rtmp/server.go

@@ -17,7 +17,7 @@ func NewServer(conn net.Conn) (*Conn, error) {
 		rd:   bufio.NewReaderSize(conn, core.BufferSize),
 		wr:   conn,
 
-		chunks: map[uint8]*header{},
+		chunks: map[uint8]*chunk{},
 
 		rdPacketSize: 128,
 		wrPacketSize: 4096,