wincg: add desktop target capture library and sample app #67
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This PR adds desktop target (DT) capture library implementation for Windows along with simple sample app (screen-grab.exe) to demonstrate library usage.
DT capture library uses 1) IDXGIOutputDuplication Windows API to get access to duplicated desktop image and 2) ffmpeg to encode sequence of duplicated images into video bitstream. As of now capture library supports only AVC, HEVC and AV1 HW encoding via ffmpeg-qsv plugins path. Library also provides access to captured cursor state.
Authored-by: Pavel Evsikov [email protected]
Co-authored-by: Dmitry Rogozhkin [email protected]