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Martin Storsjö cad42fadcd aarch64: vp9itxfm: Skip empty slices in the first pass of idct_idct 16x16 and 32x32 
This work is sponsored by, and copyright, Google.

Previously all subpartitions except the eob=1 (DC) case ran with
the same runtime:

vp9_inv_dct_dct_16x16_sub16_add_neon:   1373.2
vp9_inv_dct_dct_32x32_sub32_add_neon:   8089.0

By skipping individual 8x16 or 8x32 pixel slices in the first pass,
we reduce the runtime of these functions like this:

vp9_inv_dct_dct_16x16_sub1_add_neon:     235.3
vp9_inv_dct_dct_16x16_sub2_add_neon:    1036.7
vp9_inv_dct_dct_16x16_sub4_add_neon:    1036.7
vp9_inv_dct_dct_16x16_sub8_add_neon:    1036.7
vp9_inv_dct_dct_16x16_sub12_add_neon:   1372.1
vp9_inv_dct_dct_16x16_sub16_add_neon:   1372.1
vp9_inv_dct_dct_32x32_sub1_add_neon:     555.1
vp9_inv_dct_dct_32x32_sub2_add_neon:    5190.2
vp9_inv_dct_dct_32x32_sub4_add_neon:    5180.0
vp9_inv_dct_dct_32x32_sub8_add_neon:    5183.1
vp9_inv_dct_dct_32x32_sub12_add_neon:   6161.5
vp9_inv_dct_dct_32x32_sub16_add_neon:   6155.5
vp9_inv_dct_dct_32x32_sub20_add_neon:   7136.3
vp9_inv_dct_dct_32x32_sub24_add_neon:   7128.4
vp9_inv_dct_dct_32x32_sub28_add_neon:   8098.9
vp9_inv_dct_dct_32x32_sub32_add_neon:   8098.8

I.e. in general a very minor overhead for the full subpartition case due
to the additional cmps, but a significant speedup for the cases when we
only need to process a small part of the actual input data.

Signed-off-by: Martin Storsjö <martin@martin.st>
2016-11-30 23:57:05 +02:00
compat w32pthreads: Fix function pointer casts 2016-11-24 16:14:33 +01:00
doc utils: Add av_stream_add_side_data() 2016-11-23 10:36:13 -05:00
libavcodec aarch64: vp9itxfm: Skip empty slices in the first pass of idct_idct 16x16 and 32x32 2016-11-30 23:57:05 +02:00
libavdevice Use avpriv_report_missing_feature() where appropriate 2016-11-08 17:54:34 +01:00
libavfilter configure: Add missing asyncts filter, movie filter, and output example deps 2016-11-25 18:45:27 +01:00
libavformat avisynth: Cast to the right type when loading avisynth library functions 2016-11-29 13:13:35 +01:00
libavresample Fix some mismatches between function parameter and doxygen parameter names. 2016-11-21 14:29:10 +01:00
libavutil hwcontext_vaapi: Don't abort on failing to allocate from a fixed-size pool 2016-11-26 18:03:05 +00:00
libswscale swscale: Add GRAY12 2016-11-07 22:42:00 +01:00
presets
tests arm: vp9itxfm: Skip empty slices in the first pass of idct_idct 16x16 and 32x32 2016-11-30 23:54:07 +02:00
tools qt-faststart: Do not try to use fancy 64-bit seeking functions on mingw32ce 2016-11-24 16:14:27 +01:00
.gitattributes
.gitignore
.travis.yml
arch.mak
avconv_dxva2.c avconv_dxva2: add a profile check for hevc 2016-07-20 16:33:09 +02:00
avconv_filter.c avconv: make sure the filtergraph is freed on init failure 2016-10-02 11:41:45 +02:00
avconv_opt.c avconv_opt: Consistently iterate through hwaccels array in all cases 2016-11-13 19:06:38 +01:00
avconv_qsv.c avconv_qsv: use the actual pixel format provided by lavc 2016-07-22 19:08:12 +02:00
avconv_vaapi.c avconv_vaapi: Convert to use hw_frames_ctx only 2016-08-30 22:16:01 +01:00
avconv_vda.c
avconv_vdpau.c
avconv.c avconv: Fix the audio next dts computation 2016-11-29 10:38:01 +01:00
avconv.h avconv: support parsing bitstream filter options 2016-11-02 10:08:28 +01:00
avplay.c avplay: Correct function pointer assignments in options array 2016-11-08 17:20:30 +01:00
avprobe.c avprobe: Add -show_stream_entry to get a single stream property 2016-11-01 11:27:52 -04:00
Changelog Changelog: mark the release 12 branch 2016-08-31 08:08:32 +02:00
cmdutils_common_opts.h
cmdutils.c
cmdutils.h
common.mak build: Simplify postprocessing of linker version script files 2016-05-29 16:49:16 +02:00
configure configure: Integrate X11 checks into vaapi/vdpau checks 2016-11-29 19:14:07 +01:00
COPYING.GPLv2
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COPYING.LGPLv2.1
COPYING.LGPLv3
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INSTALL
library.mak build: Drop duplicate asm recipe 2016-10-17 16:25:35 +02:00
LICENSE Remove the legacy X11 screen grabber 2016-07-29 19:03:10 +02:00
Makefile build: Hardcode avversion.h dependency 2016-10-27 11:54:06 +02:00
README
README.md
RELEASE Make the RELEASE file match with the most recent tag 2016-10-14 13:52:51 -04:00
version.sh build: remove hardcoded name of version header 2016-09-15 21:59:15 +02:00

README.md

Libav

Build Status

Libav 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.
  • libavresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • avconv is a command line toolbox to manipulate, convert and stream multimedia content.
  • avplay is a minimalistic multimedia player.
  • avprobe is a simple analisys tool to inspect multimedia content.
  • 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

Conding examples are available in the doc/example directory.

License

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