red5源码分析—客户端publish流

接着上一章的分析结果，参考《red5源码分析—7》的分析结论，当服务器返回steamId后，客户端会执行BaseRTMPClientHandler的onCommand函数，onCommand函数会根据返回的方法名”_result”开始执行handlePendingCallResult函数，handlePendingCallResult会获取之前注册的回调函数，根据《red5源码分析—7》，该回调函数就为CreateStreamCallBack，获取回调函数后，就会执行该回调函数的resultReceived函数，下面来看，

        public void resultReceived(IPendingServiceCall call) {
            Number streamId = (Number) call.getResult();
            if (conn != null && streamId != null) {
                NetStream stream = new NetStream(streamEventDispatcher);
                stream.setConnection(conn);
                stream.setStreamId(streamId);
                conn.addClientStream(stream);
                NetStreamPrivateData streamData = new NetStreamPrivateData();
                streamData.outputStream = conn.createOutputStream(streamId);
                streamData.connConsumer = new ConnectionConsumer(conn, streamData.outputStream.getVideo(), streamData.outputStream.getAudio(), streamData.outputStream.getData());
                streamDataMap.put(streamId, streamData);
            }
            wrapped.resultReceived(call);
        }

这里首先取出服务器分配的streamId，然后构造一个NetStream并进行相应的设置，NetStream用来处理后面有关流的事件，后面会分析到。接下来通过addClientStream向RTMPMinaConnection设置刚刚创建的NetStream，定义在其父类RTMPConnection中，

    public void addClientStream(IClientStream stream) {
        if (reservedStreams.add(stream.getStreamId().doubleValue())) {
            registerStream(stream);
        } else {

        }
    }

addClientStream首先向reservedStreams注册streamId，然后通过registerStream注册，

    private boolean registerStream(IClientStream stream) {
        if (streams.putIfAbsent(stream.getStreamId().doubleValue(), stream) == null) {
            usedStreams.incrementAndGet();
            return true;
        }
        return false;
    }

这里就是根据streamId注册该stream。
回到resultReceived中，接下来构造NetStreamPrivateData，接着通过createOutputStream函数创建输出流，

    public OutputStream createOutputStream(Number streamId) {
        int channelId = getChannelIdForStreamId(streamId);
        final Channel data = getChannel(channelId++);
        final Channel video = getChannel(channelId++);
        final Channel audio = getChannel(channelId++);
        return new OutputStream(video, audio, data);
    }

这里就是构造三个Channel，分别用来发送数据、音频和视频，然后构造OutputStream。
再回到resultReceived中，接下来创建ConnectionConsumer，并通过streamId设置进streamDataMap中，最后执行另一个回调函数resultReceived，

    public void resultReceived(IPendingServiceCall call) { 
        Object result = call.getResult();  
        if (result instanceof ObjectMap) {  
            if ("connect".equals(call.getServiceMethodName())) {  
                createStream(this);  
            }  
        } else {  
            if ("createStream".equals(call.getServiceMethodName())) {  
                if (result instanceof Integer) {  
                    Integer streamIdInt = (Integer) result;  
                    int streamId = streamIdInt.intValue();  
                    publish(streamId, "testgio2", "live", this);  
                    //invoke("getRoomsInfo", this);  
                } else {  
                    disconnect();  
                }  
            } else if ("getRoomsInfo".equals(call.getServiceMethodName())) {  
                ArrayList<String> list = (ArrayList<String>) result;  
                for (int i = 0; i < list.size(); i++) {  
                    System.out.println(list.get(i));  
                }  
            }  
        }  
    }

相比前几章，这里对resultReceived的createStream对应的方法部分作了相应的改写，注释了”getRoomsInfo”部分。
publish定义在BaseRTMPClientHandler中，

    public void publish(Number streamId, String name, String mode, INetStreamEventHandler handler) {
        if (handler != null) {
            NetStreamPrivateData streamData = streamDataMap.get(streamId);
            if (streamData != null) {
                streamData.handler = handler;
            } else {

            }
        }
        final Object[] params = new Object[2];
        params[0] = name;
        params[1] = mode;
        PendingCall pendingCall = new PendingCall("publish", params);
        conn.invoke(pendingCall, getChannelForStreamId(streamId));
    }

这里首先设置了事件监听器，然后构造PendingCall并发送给服务器了，发送的命令为”publish”，参数分别是name和mode。
下一章开始分析服务器是如何处理publish命令的。