[PATCH 0/2] MR9710: winegstreamer: Read input in chunks of 256KiB instead of 512KiB.

[Charlotte Pabst (＠CharlottePabst)]

Supersedes !8183.

JR East Train Simulator's IMFByteStream implementation relies on the following two properties:
- Reads are always aligned on a 256KiB boundary.
- Reads are never larger than 256KiB.

When chunking was initially benchmarked[1], a chunk size of 512KiB only performed marginally better than 256KiB, so this change has a negligible performance impact while being more correct.

I'm testing using a WAV handler here because it's easy to create the data for it in memory (avoids including a large video file in git), but the same behavior can be observed with other handlers, such as MP4.

[1] https://gitlab.winehq.org/wine/wine/-/merge_requests/2390#note_27314