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Copy pathWebRtmpPlayer.js
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201 lines (176 loc) · 5.12 KB
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var RTMP = require('./node-rtmpapi');
var SimpleWebsocket = require('simple-websocket');
var Buffer = require('buffer').Buffer;
const H264_SEP = new Buffer([0,0,0,1]);
const FRAME_Q_SIZE = 15;
class WebRtmpPlayer
{
constructor(wsHost, app, streamName, tcUrl)
{
this._frameQ = [];
this._fps = NaN;
this._lastRenderTime = 0;
this._decoder = new Decoder();
this._player = new Player({ useWorker: false });
this._url = {host: wsHost, app: app, tcUrl: tcUrl, stream: streamName};
this._decoder.onPictureDecoded = this._onPictureDecoded.bind(this);
this._rtmpTransId = 0;
this._invokeChannel = null;
this._videoChannel = null;
this._rtmpSession = null;
this._sock = new SimpleWebsocket(this._url.host);
this._sock.setMaxListeners(100);
this._sock.on('connect', ()=>
{
new RTMP.rtmpSession(this._sock, true, this._onRtmpSessionCreated.bind(this));
})
}
get canvas() { return this._player.canvas; }
_onPictureDecoded(buffer, width, height, infos)
{
if(this._frameQ.length === FRAME_Q_SIZE)
{
console.log("** drop oldest frame!");
this._frameQ.shift(); //如果播放速度跟不上，扔掉最老那一帧
}
this._frameQ.push({data: Buffer.from(buffer), width: width, height: height, canvasObj: this._player.canvasObj});
}
_drawFrame()
{
var now = new Date();//如果播放速度跟不上网络速度，跳帧
var skipFrame = Math.floor(Math.abs(now - this._lastRenderTime) / (1000 / this._fps) ) - 1;
if(this._lastRenderTime && skipFrame > 0)
{
console.log("SkipFrmae = " + skipFrame);
//while(skipFrame-- > 0 && this._frameQ.length > 0) this._frameQ.shift();
}
var frame = this._frameQ.shift();
if(frame)
{
this._player.renderFrame(frame);
}
this._lastRenderTime = now;
}
_rtmpConnect()
{
this._rtmpSession.Q.Q(0,() =>
{
console.log("sending connect");
this._invokeChannel.sendAmf0EncCmdMsg({
cmd: 'connect',
transId:++this._rtmpTransId,
cmdObj:
{
app: this._url.app,
tcUrl: this._url.tcUrl,
fpad: false,
capabilities: 15.0, //note: 我不知道这些参数什么鬼，依据rtmpdump分析出来的
audioCodecs: 3191,
videoCodecs: 252,
videoFunction: 1.0
}
});
this._invokeChannel.invokedMethods[this._rtmpTransId] = 'connect';
});
}
_rtmpCreateStream()
{
this._rtmpSession.Q.Q(0, ()=>
{
console.log("sending createStream");
this._invokeChannel.sendAmf0EncCmdMsg({
cmd: 'createStream',
transId: ++this._rtmpTransId,
cmdObj: null
});
this._invokeChannel.invokedMethods[this._rtmpTransId] = 'createStream';
});
}
_rtmpSendPlay(msgStreamId)
{
this._rtmpSession.Q.Q(0, ()=>
{
this._videoChannel.chunk.msgStreamId = msgStreamId;
//send play ??
this._videoChannel.sendAmf0EncCmdMsg({
cmd: 'play',
transId: ++this._rtmpTransId,
cmdObj:null,
streamName: this._url.stream,
start:-2
},0);
this._invokeChannel.invokedMethods[this._rtmpTransId] = "play";
});
}
_onRtmpSessionCreated(session)
{
this._rtmpSession = session;
console.log("rtmpSession...cb...");
this._invokeChannel = new RTMP.rtmpChunk.RtmpChunkMsgClass({streamId:5}, {sock: this._sock, Q: session.Q, debug: false});
this._invokeChannel.invokedMethods = {}; //用来保存invoke的次数，以便收到消息的时候确认对应结果
this._videoChannel = new RTMP.rtmpChunk.RtmpChunkMsgClass({streamId:8}, {sock: this._sock, Q: session.Q, debug: false});
session.Q.Q(0,this._rtmpConnect.bind(this));
session.Q.Q(0, () =>
{
console.log("Begin LOOP");
session.msg.loop(this._handleRtmpMessage.bind(this));
});
}
_handleRtmpMessage(chunkMsg)
{
var chunk = chunkMsg.chunk;
var msg = chunk.msg;
console.log("GOT MESSAGE: " + chunk.msgTypeText);
//console.log("===========>\n" + JSON.stringify(msg));
if(chunk.msgTypeText == "amf0cmd")
{
if(msg.cmd == "_result")
{
var lastInvoke = this._invokeChannel.invokedMethods[msg.transId];
if(lastInvoke)
{
console.log("<--Got Invoke Result for: " + lastInvoke);
delete this._invokeChannel.invokedMethods[msg.transId];
}
switch (lastInvoke)
{
case 'connect':
return this._rtmpCreateStream();
case 'createStream':
return this._rtmpSendPlay(msg.info);
}
}
}
if(chunk.msgTypeText == "video")
{
//提取h264流
var chunkData = chunk.data;
if (chunkData.length > 4)
{
if (chunkData[1] === 1)
{
chunkData = Buffer.concat([H264_SEP, chunkData.slice(9)]);
}
else if (chunkData[1] === 0)
{
var spsSize = (chunkData[11] << 8) | chunkData[12];
var spsEnd = 13 + spsSize;
chunkData = Buffer.concat([H264_SEP, chunkData.slice(13, spsEnd), H264_SEP, chunkData.slice(spsEnd + 3)]);
}
this._decoder.decode(chunkData);
}
}
if(chunk.msgTypeText == "amf0meta" && msg.cmd == 'onMetaData')
{
console.log("onmetadata");
this._fps = chunk.msg['event']['framerate'];
console.log("fps = "+this._fps);
setInterval(this._drawFrame.bind(this), 1000.0/this._fps); //todo: clear
}
this._rtmpSession.Q.Q(0,()=>
{
this._rtmpSession.msg.loop(this._handleRtmpMessage.bind(this));
});
}
}
module.exports = WebRtmpPlayer;