stereo output support on Chrome and firefox

[Ron Sharp]

I need to send stereo OPUS audio to a webrtc client and have it output to a stereo headset. Is this possible at this time?

I have changed the sdp to support stereo and I have turned echoCancellation off but all I get is mono. Has anyone done

this and if so how? Thanks very much.

Ron

[Chris M]

Hi Ron, I have been using WebRTC stereo sound for several years using the RTCMultiConnection library in Chrome on Windows machines.  I'm sure it must be possible with other libraries as well.

 Chris

[Ron Sharp]

Thanks Chris, that is great to hear. I went to the RTCMultiConnection demo site and tried using my Logitech 920 which has stereo mics 

to connect to another computer that has a headset and did not get stereo. Did you have to set anything special or should it just work?

What mic setup do you use to record stereo? Again, thanks. Appreciate the time.

Ron

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[Chris M]

Hi Ron, I use the mics built into the Logitech C930e.    Here is the code I currently use (BandwidthHandler.setOpusAttributes seems to be the key to getting stereo working):

<script src="/dev/RTCMultiConnection.js"></script>

<script src="/dev/WebSocketConnection.js"></script>

<script src="/dev/CodecsHandler.js"></script>

<script src="/dev/getStats.js"></script>

<script src="/dev/CodecsHandler.js"></script>

<script>

var connection = new RTCMultiConnection();

connection.setCustomSocketHandler(WebSocketConnection);

connection.channel = "LocalRoomTest2";

// if you want audio+video conferencing

connection.session = {

    audio: true,

    video: true,

    data: true

};

connection.DetectRTC.load(function() {

    // you can access all microphones using "DetectRTC.audioInputDevices"

    connection.DetectRTC.audioInputDevices.forEach(function(device) {

        var option = document.createElement('option');

        console.log("audio: " + device.id + " " + device.label);

    });

    connection.DetectRTC.videoInputDevices.forEach(function(device) {

        console.log("video: " + device.id + " " + device.label);

    });

});

connection.mediaConstraints = {

            "data": true,

            "audio": {

                mandatory: {

                    echoCancellation: false, // disabling audio processing

                    googAutoGainControl: false,

                    googNoiseSuppression: false,

                    googHighpassFilter: false,

                    googTypingNoiseDetection: false,

                },

                optional: []

            },

            "video": {

                mandatory: {

                    "minWidth": "1280",

                    "minHeight": "720",

                    "minFrameRate": "30",

                    "maxWidth": "1280",

                    "maxHeight": "720",

                    "maxFrameRate": "30"

                },

                

            }

        };

    var BandwidthHandler = connection.BandwidthHandler;

    connection.bandwidth = {

        audio: 128,

        video: 2000

    };

    connection.processSdp = function(sdp) {

        sdp = BandwidthHandler.setApplicationSpecificBandwidth(sdp, connection.bandwidth, !!connection.session.screen);

        sdp = BandwidthHandler.setVideoBitrates(sdp, {

            min: connection.bandwidth.video,

            max: connection.bandwidth.video

        });

        sdp = CodecsHandler.preferCodec(sdp, "h264");

        sdp = BandwidthHandler.setOpusAttributes(sdp, {

            'stereo': 1,

            //'sprop-stereo': 1,

            'maxaveragebitrate': connection.bandwidth.audio * 1000 * 8,

            'maxplaybackrate': connection.bandwidth.audio * 1000 * 8,

            //'cbr': 1,

            //'useinbandfec': 1,

            // 'usedtx': 1,

            'maxptime': 3

        });

        return sdp;

    };

 

connection.leaveOnPageUnload = true;

connection.autoCloseEntireSession = true;

connection.onmessage = function(e) {

        console.log(e);

       };

connection.getExternalIceServers =false;

connection.userid = 'user1';

connection.open('special2');

</script>

On Wednesday, April 18, 2018 at 2:47:53 AM UTC-7, Ron Sharp wrote:

Thanks Chris, that is great to hear. I went to the RTCMultiConnection demo site and tried using my Logitech 920 which has stereo mics 

to connect to another computer that has a headset and did not get stereo. Did you have to set anything special or should it just work?

What mic setup do you use to record stereo? Again, thanks. Appreciate the time.

Ron

On Mon, Apr 16, 2018 at 11:08 AM, Chris M <spectr...@gmail.com> wrote:

Hi Ron, I have been using WebRTC stereo sound for several years using the RTCMultiConnection library in Chrome on Windows machines.  I'm sure it must be possible with other libraries as well.

 Chris

On Thursday, April 12, 2018 at 11:46:10 PM UTC-7, Ron Sharp wrote:

I need to send stereo OPUS audio to a webrtc client and have it output to a stereo headset. Is this possible at this time?

I have changed the sdp to support stereo and I have turned echoCancellation off but all I get is mono. Has anyone done

this and if so how? Thanks very much.

Ron

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[Ron Sharp]

Thanks so much Chris. All is well now. I was able to look at the RTCMultiConnection code and figure out what I needed

to do. For anyone else looking to support stereo out with WebRTC here is what you need to do:

1. When you do the getUserMedia() be sure to include for audio "{channelCount:2, echoCancellation: false}". 

2. Next after your call to createOffer (or createAnswer) and prior to your call to setLocalDescription you need to

    modify the sdp file. Find and add "; stereo=1; sprop-stereo=1" to the a=fmtp line describing opus.

That should do it. If you are receiving stereo (not generating it) there is nothing to do, it should just work.

Ron

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[HostBBB.com]

Does anyone have a working inplementation of Chrome playing a stereo webrtc source currently.

https://bugs.chromium.org/p/webrtc/issues/detail?id=8133

Our sip.js solution died version chrome 62 in August 2017.

Thanks
Stephen