我正面临着这个WEBRTC点对点应用程序非常奇怪的行为。应用程序会将音频从一个对等体流式传输到另一个对等体，但是当涉及流式视频时，它实际上流式传输视频但仅仅是前2秒，然后它将停止流式传输视频，但音频继续流式传输。以下是处理远程视频的一些代码：
var webrtc_capable = true;
var rtc_peer_connection = null;
var rtc_session_description = null;
var get_user_media = null;
var connect_stream_to_src = null;
var stun_server = null;
if (navigator.getUserMedia) {
rtc_peer_connection = RTCPeerConnection;
rtc_session_description = RTCSessionDescription;
get_user_media = navigator.getUserMedia.bind(navigator);
connect_stream_to_src = function(media_stream, media_element) {
media_element.srcObject = window.URL.createObjectURL(media_stream);
media_element.play();
};
} else if (navigator.mozGetUserMedia) {
rtc_peer_connection = mozRTCPeerConnection;
rtc_session_description = mozRTCSessionDescription;
get_user_media = navigator.mozGetUserMedia.bind(navigator);
connect_stream_to_src = function(media_stream, media_element) {
media_element.srcObject = window.URL.createObjectURL(media_stream);
media_element.play();
};
stun_server = null;
} else if (navigator.webkitGetUserMedia) {
rtc_peer_connection = webkitRTCPeerConnection;
rtc_session_description = RTCSessionDescription;
get_user_media = navigator.webkitGetUserMedia.bind(navigator);
connect_stream_to_src = function(media_stream, media_element) {
media_element.src = webkitURL.createObjectURL(media_stream);
};
} else {
alert("This browser does not support WebRTC - visit WebRTC.org for more info");
webrtc_capable = false;
}
</script>
<script>
var call_token;
var signaling_server;
var peer_connection;
function start() {
// create the WebRTC peer connection object
peer_connection = new rtc_peer_connection({
"iceServers": [ // information about ice servers
{ "url": "stun:"+stun_server },
]
});
// generic handler that sends any ice candidates to the other peer
peer_connection.onicecandidate = function (ice_event) {
console.log(ice_event.candidate);
if (ice_event.candidate){
console.log("true");
}
if (ice_event.candidate) {
signaling_server.send(
JSON.stringify({
token:call_token,
type: "new_ice_candidate",
candidate: ice_event.candidate ,
})
);
}
};
peer_connection.onaddstream = function (event) {
var video = document.querySelector("#remote_video");
video.src = webkitURL.createObjectURL(event.stream);
document.getElementById("loading_state").style.display = "none";
document.getElementById("open_call_state").style.display = "block";
};
setup_video();
signaling_server = new WebSocket("ws://localhost:1234");
if (document.location.hash === "" || document.location.hash === undefined) {
var token = Date.now()+"-"+Math.round(Math.random()*10000);
call_token = "#"+token;
document.location.hash = token;
signaling_server.onopen = function() {
signaling_server.onmessage = caller_signal_handler;
signaling_server.send(
JSON.stringify({
token:call_token,
type:"join",
})
);
}
document.title = "You are the Caller";
document.getElementById("loading_state").innerHTML = "Ready for a call...ask your friend to visit:<br/><br/>"+document.location;
} else { // you have a hash fragment so you must be the Callee
// get the unique token for this call from location.hash
call_token = document.location.hash;
signaling_server.onopen = function() {
// setup caller signal handler
signaling_server.onmessage = callee_signal_handler;
// tell the signaling server you have joined the call
signaling_server.send(
JSON.stringify({
token:call_token,
type:"join",
})
);
// let the caller know you have arrived so they can start the call
signaling_server.send(
JSON.stringify({
token:call_token,
type:"callee_arrived",
})
);
}
document.title = "You are the Callee";
document.getElementById("loading_state").innerHTML = "One moment please...connecting your call...";
}
// setup message bar handlers
document.getElementById("message_input").onkeydown = send_chat_message;
document.getElementById("message_input").onfocus = function() { this.value = ""; }
}
// handler to process new descriptions
function new_description_created(description) {
peer_connection.setLocalDescription(
description,
function () {
signaling_server.send(
JSON.stringify({
token:call_token,
type:"new_description",
sdp:description
})
);
},
log_error
);
}
// handle signals as a caller
function caller_signal_handler(event) {
var signal = JSON.parse(event.data);
if (signal.type === "callee_arrived") {
peer_connection.createOffer(
new_description_created,
log_error
);
} else if (signal.type === "new_ice_candidate") {
peer_connection.addIceCandidate(new RTCIceCandidate(signal.candidate));
} else if (signal.type === "new_description") {
peer_connection.setRemoteDescription(
new rtc_session_description(signal.sdp),
function () {
if (peer_connection.remoteDescription.type == "answer") {
peer_connection.createOffer(new_description_created, log_error);
}
},
log_error
);
} else if (signal.type === "new_chat_message") {
add_chat_message(signal);
} else {
// extend with your own signal types here
}
}
// handle signals as a callee
function callee_signal_handler(event) {
var signal = JSON.parse(event.data);
if (signal.type === "new_ice_candidate") {
peer_connection.addIceCandidate(
new RTCIceCandidate(signal.candidate)
);
} else if (signal.type === "new_description") {
peer_connection.setRemoteDescription(
new rtc_session_description(signal.sdp),
function () {
if (peer_connection.remoteDescription.type == "offer") {
peer_connection.createAnswer(new_description_created, log_error);
}
},
log_error
);
} else if (signal.type === "new_chat_message") {
add_chat_message(signal);
} else {
// extend with your own signal types here
}
}
// add new chat message to messages list
function add_chat_message(signal) {
var messages = document.getElementById("messages");
var user = signal.user || "them";
messages.innerHTML = user+": "+signal.message+"<br/>\n"+messages.innerHTML;
}
// send new chat message to the other browser
function send_chat_message(e) {
if (e.keyCode == 13) {
var new_message = this.value;
this.value = "";
signaling_server.send(
JSON.stringify({
token:call_token,
type: "new_chat_message",
message: new_message
})
);
add_chat_message({ user: "you", message: new_message });
}
}
// setup stream from the local camera
function setup_video() {
get_user_media(
{
"audio": true, // request access to local microphone
"video": true // request access to local camera
},
function (local_stream) {
<video> MediaElement
connect_stream_to_src(local_stream, document.getElementById("local_video"));
peer_connection.addStream(local_stream);
},
log_error
);
}
function log_error(error) {
console.log(error);
}
</script>
其他信息：