audio-only-streaming.html

<blockquote style="background: #f3b7b7;border: 5px solid black;border-radius: 5px;padding: 5px 10px; margin: 10px 20px;">
    This demo is <span style="border: 1px dotted red; background: yellow; padding: 2px 5px;">out-dated (published on 2013)</span>. Please check this instead: <a href="https://github.com/webrtc/samples">https://github.com/webrtc/samples</a>
</blockquote>

<script>
    var offerer, answerer;

    window.RTCPeerConnection = window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
    window.RTCSessionDescription = window.mozRTCSessionDescription || window.RTCSessionDescription;
    window.RTCIceCandidate = window.mozRTCIceCandidate || window.RTCIceCandidate;

    navigator.getUserMedia = navigator.mozGetUserMedia || navigator.webkitGetUserMedia;
    window.URL = window.webkitURL || window.URL;

    window.iceServers = {
        iceServers: [{
                url: 'stun:23.21.150.121'
            }
        ]
    };
</script>
<script>
    /* offerer */

    function offererPeer(stream) {
        offerer = new RTCPeerConnection(window.iceServers);

        // stream is only attached by offerer
        offerer.addStream(stream);

        offerer.onicecandidate = function (event) {
            if (!event || !event.candidate) return;
            answerer.addIceCandidate(event.candidate);
        };

        offerer.createOffer(function (offer) {
            console.debug('offer sdp', offer.sdp);

            offerer.setLocalDescription(offer);
            answererPeer(offer);
        });
    }
</script>
<script>
    /* answerer */

    function answererPeer(offer) {
        answerer = new RTCPeerConnection(window.iceServers);

        // stream that is flowing from offerer toward answerer
        answerer.onaddstream = function (event) {
            console.debug('remote stream', event.stream);

            var audio = document.createElement('audio');
            audio.src = URL.createObjectURL(event.stream);
            document.body.appendChild(audio);
            audio.controls = true;
            audio.play();
        };

        answerer.onicecandidate = function (event) {
            if (!event || !event.candidate) return;
            offerer.addIceCandidate(event.candidate);
        };

        answerer.setRemoteDescription(offer);
        answerer.createAnswer(function (answer) {
            console.debug('answer sdp', answer.sdp);

            answerer.setLocalDescription(answer);
            offerer.setRemoteDescription(answer);
        });
    }
</script>
<script>
    function getUserMedia(callback) {
        navigator.getUserMedia({
            audio: true,
            video: false
        }, callback, onerror);

        function onerror(e) {
            console.error(e);
        }
    }
    getUserMedia(offererPeer);
</script>