I discussed this with Måns, and on his advice I pulled across the
following patches from the ffmpeg trunk (revision numbers shown are
relative to svn://svn.ffmpeg.org/ffmpeg/trunk).
r18332 (ARM: NEON optimised add_pixels_clamped)
r18333 (ARM: NEON optimized put_signed_pixels_clamped)
r18535 (Add guaranteed alignment for loading dest pixels in avg_pixels16_neon)
r18601 (ARM asm for AV_RN*())
r18712 (ARM: NEON put_pixels_clamped)
r18713 (ARM: Use fewer register in NEON put_pixels _y2 and _xy2)
r18916 (ARM: NEON VP3 Loop Filter)
r18972 (ARM: add some PLD in NEON IDCT)
r19216 (ARM: slightly faster NEON H264 horizontal loop filter)
They mostly apply cleanly against ffmpeg 3:0.svn 20090303-1ubuntu6 with
just a couple of minor manual merges needed. I uncommented FLAVORS +=
neon in debian/confflags and got a successful build, but I still need to
examine and test the result.
NOTE: Because the NEON code makes use of floating-point functionality, I think
that we need the following in debian/confflags:
neon_build_confflags += --shlibdir=/usr/lib/neon/vfp (or
/usr/lib/vfp/neon)
(instead of --shlibdir=/usr/lib/neon)
We may also want to add --extra-cflags="-mfpu=neon -mfloat-abi=softfp"
for this configuration. According to tests we've done here, -ftree-
vectorize is also beneficial by parallelising some computations (this is
not enabled by default for -O2). I haven't tested these yet myself
though.
--
Integrate and enable ARMv5TE/v6/VFP and NEON optimisations from ffmpeg trunk
for armel
https://bugs.launchpad.net/bugs/383240
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