[PATCH v2 0/2] MR8282: winegstreamer: Don't hold lock during wg_parser_stream_get_buffer.

[Brendan McGrath (＠redmcg)]

This fixes a looping audio issue during seek in VRChat. The issue is that on Windows the stop request in handled immediately thus the AVPro MFT (which loops the audio) can be immediately flushed. Wine currently waits for a pending sample request to be completed before handling the stop request. As a result, the AVPro MFT loops audio whilst it waits for another sample (or to be flushed).

This MR releases the source CS before calling `wg_parser_stream_get_buffer` so it does not delay the handling of the stop request. This appears to be safe as the Unix side of `wg_parser_stream_get_buffer` has its own set of primitives.

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  v2: winegstreamer: Don't hold lock during wg_parser_stream_get_buffer.
      winegstreamer: Signal eos on disconnect.

https://gitlab.winehq.org/wine/wine/-/merge_requests/8282