rtmp: rewrite implementation of rtmp connection (#1047)

* rtmp: improve MsgCommandAMF0

* rtmp: fix MsgSetPeerBandwidth

* rtmp: add message tests

* rtmp: replace implementation with new one

* rtmp: rename handshake functions

* rtmp: avoid calling useless function

* rtmp: use time.Duration for PTSDelta

* rtmp: fix decoding chunks with relevant size

* rtmp: rewrite implementation of rtmp connection

* rtmp: fix tests

* rtmp: improve error message

* rtmp: replace h264 config implementation

* link against github.com/notedit/rtmp

* normalize MessageStreamID

* rtmp: make acknowledge optional

* rtmp: fix decoding of chunk2 + chunk3

* avoid using encoding/binary

internal/rtmp/message/msg_setwindowacksize.go

@@ -1,7 +1,6 @@
-package message
+package message //nolint:dupl
 
 import (
-	"encoding/binary"
 	"fmt"
 
 	"github.com/aler9/rtsp-simple-server/internal/rtmp/chunk"
@@ -23,18 +22,23 @@ func (m *MsgSetWindowAckSize) Unmarshal(raw *rawmessage.Message) error {
 		return fmt.Errorf("unexpected body size")
 	}
 
-	m.Value = binary.BigEndian.Uint32(raw.Body)
+	m.Value = uint32(raw.Body[0])<<24 | uint32(raw.Body[1])<<16 | uint32(raw.Body[2])<<8 | uint32(raw.Body[3])
+
 	return nil
 }
 
 // Marshal implements Message.
 func (m *MsgSetWindowAckSize) Marshal() (*rawmessage.Message, error) {
-	body := make([]byte, 4)
-	binary.BigEndian.PutUint32(body, m.Value)
+	buf := make([]byte, 4)
+
+	buf[0] = byte(m.Value >> 24)
+	buf[1] = byte(m.Value >> 16)
+	buf[2] = byte(m.Value >> 8)
+	buf[3] = byte(m.Value)
 
 	return &rawmessage.Message{
 		ChunkStreamID: ControlChunkStreamID,
 		Type:          chunk.MessageTypeSetWindowAckSize,
-		Body:          body,
+		Body:          buf,
 	}, nil
 }