This article describes how to open a RTMP The whole process from streaming media to video and audio data playing .
Be careful ：RTMP The logical structure of
RTMP Provisions of the agreement , There are two prerequisites for playing a streaming media ： First step , Set up a network connection （NetConnection）; The second step , Build a network flow （NetStream）. among , Network connectivity represents the underlying connectivity between server-side applications and clients . Network flow represents the channel for sending multimedia data . Only one network connection can be established between the server and the client , But based on this connection, you can create many network flows . Their relationship is shown in the picture ：
1 Brief introduction
Play a RTMP Protocol streaming media needs to go through the following steps ： handshake , Establishing a connection , Build the flow , Play .RTMP The connection starts with a handshake . The connection establishment phase is used to establish the connection between the client and the server “ network connections ”; The build flow phase is used to establish the “ Network flow ”; The playback phase is used to transmit video and audio data .
2 handshake （HandShake）
One RTMP The connection starts with a handshake , Both sides send three data blocks of fixed size
a) The handshake starts with the client sending C0、C1 block . Server received C0 or C1 Post send S0 and S1.
b) When the client is collected S0 and S1 after , Start sending C2. When the server is collected C0 and C1 after , Start sending S2.
c) When the client and the server receive S2 and C2 after , The handshake is complete .
handshake
3 Set up a network connection （NetConnection）
a) The client sends the “ Connect ”(connect) To the server , Request a connection to an instance of a service application .
b) After the server receives the connection command message , Send confirmation window size (Window Acknowledgement Size) Protocol message to client , Also connect to the application mentioned in the connect command .
c) Server send set bandwidth () Protocol message to client .
d) After the client processes the set bandwidth protocol message , Send confirmation window size (Window Acknowledgement Size) Protocol messages to the server .
e) The server sends the user control message “ The flow begins ”(Stream Begin) Message to client .
f) The server sends the “ result ”(_result), Notify the client of the status of the connection .
Establishing a connection
4 Set up network flow （NetStream）
a) The client sends the “ Create stream ”（createStream） Command to the server .
b) Received by the server “ Create stream ” After the command , Send... In the command message “ result ”(_result), Notify the client of the status of the stream .
Build the flow
5 Play （Play）
a) The client sends the “ Play ”（play） Command to server .
b) After receiving the play command , Server send set block size （ChunkSize） Agreement message .
c) The server sends the user control message “streambegin”, Tell the client stream ID.
d) If the play command is successful , The server sends the “ Response state ” NetStream.Play.Start & NetStream.Play.reset, Inform client “ Play ” Command executed successfully .
e) After that, the server sends the audio and video data that the client wants to play .
RTMP Protocol specification （ Chinese translation ）：http://download.csdn.net/detail/leixiaohua1020/6563059
turn ：http://blog.csdn.net/leixiaohua1020/article/details/11704355
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