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Martin Storsjö 2ed67eba96 arm: Add NEON optimizations for 10 and 12 bit vp9 itxfm This work is sponsored by, and copyright, Google. This is structured similarly to the 8 bit version. In the 8 bit version, the coefficients are 16 bits, and intermediates are 32 bits. Here, the coefficients are 32 bit. For the 4x4 transforms for 10 bit content, the intermediates also fit in 32 bits, but for all other transforms (4x4 for 12 bit content, and 8x8 and larger for both 10 and 12 bit) the intermediates are 64 bit. For the existing 8 bit case, the 8x8 transform fit all coefficients in registers; for 10/12 bit, when the coefficients are 32 bit, the 8x8 transform also has to be done in slices of 4 pixels (just as 16x16 and 32x32 for 8 bit). The slice width also shrinks from 4 elements to 2 elements in parallel for the 16x16 and 32x32 cases. The 16 bit coefficients from idct_coeffs and similar tables also need to be lenghtened to 32 bit in order to be used in multiplication with vectors with 32 bit elements. This leads to the fixed coefficient vectors needing more space, leading to more cases where they have to be reloaded within the transform (in iadst16). This technically would need testing in checkasm for subpartitions in increments of 2, but that slows down normal checkasm runs excessively. Examples of relative speedup compared to the C version, from checkasm: Cortex A7 A8 A9 A53 vp9_inv_adst_adst_4x4_sub4_add_10_neon: 4.83 11.36 5.22 6.77 vp9_inv_adst_adst_8x8_sub8_add_10_neon: 4.12 7.60 4.06 4.84 vp9_inv_adst_adst_16x16_sub16_add_10_neon: 3.93 8.16 4.52 5.35 vp9_inv_dct_dct_4x4_sub1_add_10_neon: 1.36 2.57 1.41 1.61 vp9_inv_dct_dct_4x4_sub4_add_10_neon: 4.24 8.66 5.06 5.81 vp9_inv_dct_dct_8x8_sub1_add_10_neon: 2.63 4.18 1.68 2.87 vp9_inv_dct_dct_8x8_sub4_add_10_neon: 4.52 9.47 4.24 5.39 vp9_inv_dct_dct_8x8_sub8_add_10_neon: 3.45 7.34 3.45 4.30 vp9_inv_dct_dct_16x16_sub1_add_10_neon: 3.56 6.21 2.47 4.32 vp9_inv_dct_dct_16x16_sub2_add_10_neon: 5.68 12.73 5.28 7.07 vp9_inv_dct_dct_16x16_sub8_add_10_neon: 4.42 9.28 4.24 5.45 vp9_inv_dct_dct_16x16_sub16_add_10_neon: 3.41 7.29 3.35 4.19 vp9_inv_dct_dct_32x32_sub1_add_10_neon: 4.52 8.35 3.83 6.40 vp9_inv_dct_dct_32x32_sub2_add_10_neon: 5.86 13.19 6.14 7.04 vp9_inv_dct_dct_32x32_sub16_add_10_neon: 4.29 8.11 4.59 5.06 vp9_inv_dct_dct_32x32_sub32_add_10_neon: 3.31 5.70 3.56 3.84 vp9_inv_wht_wht_4x4_sub4_add_10_neon: 1.89 2.80 1.82 1.97 The speedup compared to the C functions is around 1.3 to 7x for the full transforms, even higher for the smaller subpartitions. Signed-off-by: Martin Storsjö <martin@martin.st>		8 years ago
compat	compat/atomics: rename header guards	8 years ago
doc	avfilter: add EIA-608 line extractor	8 years ago
libavcodec	arm: Add NEON optimizations for 10 and 12 bit vp9 itxfm	8 years ago
libavdevice	lavd/lavfi: use buffersink accessors.	8 years ago
libavfilter	avfilter: add EIA-608 line extractor	8 years ago
libavformat	avformat/hlsenc: improve to write m3u8 head block	8 years ago
libavresample	…
libavutil	hwcontext_cuda: implement frames_get_constraints	8 years ago
libpostproc	…
libswresample	swresample/arm: cosmetic fixes	8 years ago
libswscale	swscale/swscale: Fix dereference of stride array before null check	8 years ago
presets	…
tests	Merge commit '71a0472114574993df7035f4de9aa007e03817b8'	8 years ago
tools	tools/zmqsend: Do not truncate fgetc() return	8 years ago
.gitattributes	…
.gitignore	…
.travis.yml	…
CONTRIBUTING.md	…
COPYING.GPLv2	…
COPYING.GPLv3	…
COPYING.LGPLv2.1	…
COPYING.LGPLv3	…
CREDITS	…
Changelog	avfilter: add EIA-608 line extractor	8 years ago
INSTALL.md	…
LICENSE.md	lavfi/f_ebur128: relicense to LGPL	8 years ago
MAINTAINERS	dxva2: allow an empty array of ID3D11VideoDecoderOutputView	8 years ago
Makefile	…
README.md	…
RELEASE	RELEASE: Update for past 3.2 branch	8 years ago
arch.mak	…
cmdutils.c	cmdutils: remove duplicate windows.h include	8 years ago
cmdutils.h	cmdutils: add show_demuxers and show_muxers	8 years ago
cmdutils_common_opts.h	cmdutils: add show_demuxers and show_muxers	8 years ago
cmdutils_opencl.c	cmdutils_opencl: fix resource_leak cid 1396852	8 years ago
common.mak	…
configure	vaapi_hevc: Convert to use the new VAAPI hwaccel code	8 years ago
ffmpeg.c	ffmpeg: pass output stream duration as a hint to the muxer	8 years ago
ffmpeg.h	ffmpeg: Add -time_base option to hint the time base	8 years ago
ffmpeg_cuvid.c	…
ffmpeg_dxva2.c	…
ffmpeg_filter.c	ffmpeg: use buffersink accessors.	8 years ago
ffmpeg_opt.c	ffmpeg: Add -time_base option to hint the time base	8 years ago
ffmpeg_qsv.c	ffmpeg: Add an option "qsv_device" to choose proper node for QSV child device (vaapi or dxva2)	8 years ago
ffmpeg_vaapi.c	ffmpeg_vaapi: Convert to use hw_frames_ctx only	8 years ago
ffmpeg_vdpau.c	…
ffmpeg_videotoolbox.c	…
ffplay.c	ffplay: fix indentation after last commit	8 years ago
ffprobe.c	lavc: Add spherical packet side data API	8 years ago
ffserver.c	ffserver: local OOB write with custom program name	8 years ago
ffserver_config.c	ffserver_config: Check for failure to allocate FFServerIPAddressACL	8 years ago
ffserver_config.h	ffsrever: Make the status page bitexact if any stream is bitexact	8 years ago
library.mak	…
version.sh	…

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.