rtmp: add message reader / writer

internal/rtmp/message/msg_command_amf0.go

@@ -0,0 +1,39 @@
+package message
+
+import (
+	"github.com/notedit/rtmp/format/flv/flvio"
+
+	"github.com/aler9/rtsp-simple-server/internal/rtmp/chunk"
+	"github.com/aler9/rtsp-simple-server/internal/rtmp/rawmessage"
+)
+
+// MsgCommandAMF0 is a AMF0 command message.
+type MsgCommandAMF0 struct {
+	ChunkStreamID   byte
+	MessageStreamID uint32
+	Payload         []interface{}
+}
+
+// Unmarshal implements Message.
+func (m *MsgCommandAMF0) Unmarshal(raw *rawmessage.Message) error {
+	m.ChunkStreamID = raw.ChunkStreamID
+	m.MessageStreamID = raw.MessageStreamID
+
+	payload, err := flvio.ParseAMFVals(raw.Body, false)
+	if err != nil {
+		return err
+	}
+	m.Payload = payload
+
+	return nil
+}
+
+// Marshal implements Message.
+func (m MsgCommandAMF0) Marshal() (*rawmessage.Message, error) {
+	return &rawmessage.Message{
+		ChunkStreamID:   m.ChunkStreamID,
+		Type:            chunk.MessageTypeCommandAMF0,
+		MessageStreamID: m.MessageStreamID,
+		Body:            flvio.FillAMF0ValsMalloc(m.Payload),
+	}, nil
+}