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Martin Storsjö b4dc7c341e arm: vp9: Add NEON itxfm routines 
This work is sponsored by, and copyright, Google.

For the transforms up to 8x8, we can fit all the data (including
temporaries) in registers and just do a straightforward transform
of all the data. For 16x16, we do a transform of 4x16 pixels in
4 slices, using a temporary buffer. For 32x32, we transform 4x32
pixels at a time, in two steps of 4x16 pixels each.

Examples of relative speedup compared to the C version, from checkasm:
                         Cortex       A7     A8     A9    A53
vp9_inv_adst_adst_4x4_add_neon:     3.39   5.83   4.17   4.01
vp9_inv_adst_adst_8x8_add_neon:     3.79   4.86   4.23   3.98
vp9_inv_adst_adst_16x16_add_neon:   3.33   4.36   4.11   4.16
vp9_inv_dct_dct_4x4_add_neon:       4.06   6.16   4.59   4.46
vp9_inv_dct_dct_8x8_add_neon:       4.61   6.01   4.98   4.86
vp9_inv_dct_dct_16x16_add_neon:     3.35   3.44   3.36   3.79
vp9_inv_dct_dct_32x32_add_neon:     3.89   3.50   3.79   4.42
vp9_inv_wht_wht_4x4_add_neon:       3.22   5.13   3.53   3.77

Thus, the speedup vs C code is around 3-6x.

This is mostly marginally faster than the corresponding routines
in libvpx on most cores, tested with their 32x32 idct (compared to
vpx_idct32x32_1024_add_neon). These numbers are slightly in libvpx's
favour since their version doesn't clear the input buffer like ours
do (although the effect of that on the total runtime probably is
negligible.)

                           Cortex       A7       A8       A9      A53
vp9_inv_dct_dct_32x32_add_neon:    18436.8  16874.1  14235.1  11988.9
libvpx vpx_idct32x32_1024_add_neon 20789.0  13344.3  15049.9  13030.5

Only on the Cortex A8, the libvpx function is faster. On the other cores,
ours is slightly faster even though ours has got source block clearing
integrated.

This is an adapted cherry-pick from libav commits
a67ae67083 and
52d196fb30.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
2016-11-15 15:10:03 -05:00
compat
doc doc/filters: add metadata information for blackframe 2016-11-14 11:59:52 -09:00
libavcodec arm: vp9: Add NEON itxfm routines 2016-11-15 15:10:03 -05:00
libavdevice
libavfilter lavfi/ebur128: use ff_ prefix 2016-11-13 19:11:07 -06:00
libavformat lavf/Makefile: Fix rule for the data muxer. 2016-11-14 13:33:22 +01:00
libavresample
libavutil arm: Clear the gp register alias at the end of functions 2016-11-15 15:10:03 -05:00
libpostproc
libswresample
libswscale lsws: Add GRAY10 conversion. 2016-11-14 10:35:06 +01:00
presets
tests Merge commit 'f8d17d53957056c053a46f9320fa7ae6fe1479a5' 2016-11-14 15:29:08 +01:00
tools
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configure Merge commit '8c929037ec75fbe9f367e0a31ee34839e92de481' 2016-11-14 10:09:44 +01:00
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ffmpeg_cuvid.c
ffmpeg_dxva2.c
ffmpeg_filter.c
ffmpeg_opt.c
ffmpeg_qsv.c ffmpeg_qsv: Fix hwaccel transcoding 2016-11-13 17:49:48 +00:00
ffmpeg_vaapi.c
ffmpeg_vdpau.c
ffmpeg_videotoolbox.c
ffmpeg.c Merge commit 'b55566db4c51d920a6496455bb30a608e5a50a41' 2016-11-14 14:56:52 +01:00
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README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
  • ffplay is a minimalistic multimedia player.
  • ffprobe is a simple analysis tool to inspect multimedia content.
  • ffserver is a multimedia streaming server for live broadcasts.
  • Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Coding examples are available in the doc/examples directory.

License

FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.