[Bug 46450] Volume Control doesn't work in Firefox videos ( and browsers based on it) with PulseAudio driver

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=46450

--- Comment #5 from Gabriel Ivăncescu <gabrielopcode at gmail.com> ---
Sure I'll do the renames. The applications I tested with were Firefox &
Palemoon, Winamp with WaveOut (which had the same bug), and I also tested
REAPER but it appears it handles volume changes on its own, so instead I tried
all formats from REAPER but changing to an artificial 0.5 mastervol in the
source code to halve the volume, and it worked fine.

PROCESS_BUFFERS is endian-specific since it uses the target's endianess to read
one sample at a time for efficiency, which is important for low latency buffers
(compiler will also auto-vectorize it this way, so it's much more efficient).
Since the Windows API uses little-endian, it needs to match.

I can add a big-endian case, but I didn't find it worth it, since as far as I
know, Windows doesn't run on Big Endian and I doubt this will run properly when
compiled like that. But just in case I'll be asking: is there some
macro/function I can use to bswap or do I have to read 1 byte at a time
manually in such case? (the formats will still be little-endian since that's
what the Windows API uses)

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