dshowvideosrc: add device-index, add GstDeviceMonitor, and several fixes
- Nov 09, 2018
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Right now this only works for video. An attempt was made at adding monitoring following the example winks, but it seems the only devices that can be easily detected are KS sources, which winks already handles.
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This allows a future GstDeviceProvider to more easily query devices and caps.
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The device and device-name properties should treat NULL and empty strings the same
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The previous behaviour had issues when setting one of the device properties after _get_caps had been called. The device shouldn't be locked in until after _start has been called.
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