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mfplay: Add support for async user callback

System Internals / WINE - Nikolay Sivov [codeweavers.com] - 6 April 2021 20:46 UTC

ef908ef2482 mfplay: Add support for async user callback.
dlls/mfplay/player.c | 222 +++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 216 insertions(+), 6 deletions(-)

Upstream: source.winehq.org