[Bugs] #4859 Record NORM: switch camera

[Sugar Labs Bugs]

#4859: switch camera
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       Reporter:  quozl        |       Owner:
           Type:  enhancement  |      Status:  new
       Priority:  Normal       |   Milestone:  Unspecified
      Component:  Record       |     Version:  Git as of bugdate
       Severity:  Major        |    Keywords:
Distribution/OS:  Unspecified  |  Bug Status:  New
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 Some systems have more than one camera, or an external camera such as a
 microscope or webcam can be connected to USB.

 At the moment, Record cannot handle a second camera unless it is present
 before the base camera is probed.  Timing of probing of base camera varies
 by hardware platform and how the kernel is configured.  Cameras can be
 identified by /dev/v4l links, or through GStreamer.

 For example, connecting a microscope yields:
  * /dev/video1 character device,
  * /dev/v4l/by-id/usb-Vimicro_Corp._Venus_USB2.0_Camera-video-index0
 symbolic link to /dev/video1
  * /dev/v4l/by-path/platform-d420a000.camera-video-index0 symbolic link to
 /dev/video1

 Suggestions:
  * offer a toolbar icon with a list of cameras to use,
  * if camera is changed, stop the stream, change the device, restart the
 stream.
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Ticket URL: <http://bugs.sugarlabs.org/ticket/4859>
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