[FFmpeg-devel] [PATCHv3] On2 VP7 decoder
Michael Niedermayer
michaelni at gmx.at
Tue Mar 25 13:25:36 CET 2014
On Tue, Feb 18, 2014 at 09:52:30PM +1100, Peter Ross wrote:
> Signed-off-by: Peter Ross <pross at xvid.org>
> ---
> Here is my first attempt at addressing the VP8 performance regressions
> introduced by the VP7 decoder.
>
> This uses 'always inline & static template' approach to generate vp7_ and
> vp8_ variants of performance critical functions. Every function containing
> an 'if vp7' branch below vp8_decode_mb_row_sliced is duplicated.
>
> As a sanity check --disable-decoder=vp7 makes the resulting vp8.o binary is
> virtually identical to the current vp8.o file. The only difference being the
> use of function pointers for decode_mb_row_no_filter and filter_mb_row.
>
> user times from VP8 'A_4K_Video_Reel_by_Bright_Side_Network_Inc..webm' on
> Core2 Q9400. In seconds.
> VP8 only: 82.013 82.049 82.059 82.089 82.095 : AVERAGE 82.061
> VP7+VP8: 82.206 82.234 82.249 82.253 82.261 : AVERAGE 82.241
> VP8 only: 82.056 82.065 82.114 82.211 82.224 : AVERAGE 82.134
> VP7+VP8: 82.257 82.339 82.356 82.391 82.482 : AVERAGE 82.365
>
> There is a fairly consistent ~0.25% performance drop for this input. It would
> be nice to get performance data on other platforms where VP8 is popular. ARM
> especially.
>
> Other changes in PATCHv3:
> - combine fade operation with gold frame preservation
> - optimise inter_predict_dc usage
> - described vp7_calculate_mb_offset
> - dont bother zeroing block/block_dc as done by idct now
>
> Thanks to Ronald and Jason for their thorough reviews. Cheers,
>
> Changelog | 1 +
> doc/general.texi | 2 +
> libavcodec/Makefile | 1 +
> libavcodec/allcodecs.c | 1 +
> libavcodec/arm/h264pred_init_arm.c | 6 +-
> libavcodec/arm/vp8.h | 2 +-
> libavcodec/avcodec.h | 1 +
> libavcodec/codec_desc.c | 7 +
> libavcodec/h264pred.c | 16 +-
> libavcodec/vp8.c | 759 +++++++++++++++++++++++++++++------
> libavcodec/vp8.h | 26 ++
> libavcodec/vp8data.h | 138 ++++++-
> libavcodec/x86/Makefile | 3 +
> libavcodec/x86/h264_intrapred_init.c | 10 +-
> 14 files changed, 829 insertions(+), 144 deletions(-)
applied
thanks
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Frequently ignored answer#1 FFmpeg bugs should be sent to our bugtracker. User
questions about the command line tools should be sent to the ffmpeg-user ML.
And questions about how to use libav* should be sent to the libav-user ML.
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