How to change camera with WebRTC on IOS device？

[Peter Lee]

Hi，everyone

I wonder how to switch camera when we are calling with WebRTC？using RTCMediaStream.
addVideoTrack/removeVideoTrack and RTCPeerConnection.addStream/removeStream?

thanks

[Zeke Chin]

See - [APPRTCConnectionManager appClient:didReceiveICEServers:] for an example of how a capturer/track/mediastream is set up.

The example uses the front camera - to use a different camera simply change the provided AVCaptureDevice.

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[Wayne Hawkins]

Did you ever get this working correctly?

My current implementation allows me to swap the camera once (which also seems to result in there being a greater delay on the receiving end). 

Then, whenever I swap it again via a toggle, the app will stop running on the following line

 glTexImage2D(GL_TEXTURE_2D,      0,      RTC_PIXEL_FORMAT,     frame.width,      frame.height,       0,       RTC_PIXEL_FORMAT,     GL_UNSIGNED_BYTE,       frame.yPlane);

The log shows this:

2014-07-31 15:43:25.664 AppRTCDemo[1396:60b] PCO onRenegotiationNeeded - ignoring because AppRTC has a predefined negotiation strategy

2014-07-31 15:43:25.665 AppRTCDemo[1396:60b] PCO onRenegotiationNeeded - ignoring because AppRTC has a predefined negotiation strategy

Camera 'com.apple.avfoundation.avcapturedevice.built-in_video:0' stopped after capturing 734 frames and dropping 0%

(lldb) 

The error itself is - Thread 1:EXC_BAD_ACCESS(code=1, address.... etc

The method I use is likely the issue but here it is:

remove the localmediastream from the peerconnection

remove the localvideotrack from the localmediastream

create a new videosource in the same method mentioned by Zeke

set the localvideotrack to use the source

add the localvideotrack back to the localmediastream

add the localmediastream to the peerconnection

finally set my localvideoview.videotrack to equal the localviewtrack as well. 

Thanks 

[devil 2010]

hi, any solution? Im stucking in switch camera then got H264 encode error

Vào lúc 21:50:46 UTC+7 ngày Thứ Năm, 31 tháng 7, 2014, bulletma...@msn.com đã viết:

[John Mikelich]

I don't remove anything. I just switch the avcapturedevice.

Googles demo app has a good example if this.

Here's a snippet, I use ARDCaptureController from  that demo app.

Note that the tracks, streams, and peer connections are not touched.

- (void)changeCamera {

  AVCaptureDevicePosition position =

      _usingFrontCamera ? AVCaptureDevicePositionFront : AVCaptureDevicePositionBack;

  AVCaptureDevice *device = [self findDeviceForPosition:position];

  AVCaptureDeviceFormat *format = [self selectFormatForDevice:device];

  if (format == nil) {

    RTCLogError(@"No valid formats for device %@", device);

    NSAssert(NO, @"");

    return;

  }

  NSInteger fps = [self selectFpsForFormat:format];

  [_capturer startCaptureWithDevice:device format:format fps:fps];

  _capturer.captureDelegate = self;

}