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The loop filter is only active if min(a1,a2)<abs(a0) which is done via masking. Ergo the sign of min(a1,a2)-abs(a0) is known (always negative) and one does not need to use PABSW to get its absolute value. This gives a small speedup. Old benchmarks: vc1dsp.vc1_h_loop_filter4_bestcase_c: 3.1 vc1dsp.vc1_h_loop_filter4_bestcase_ssse3: 33.6 ( 0.09x) vc1dsp.vc1_h_loop_filter4_worstcase_c: 43.0 vc1dsp.vc1_h_loop_filter4_worstcase_ssse3: 33.4 ( 1.29x) vc1dsp.vc1_h_loop_filter8_bestcase_c: 6.0 vc1dsp.vc1_h_loop_filter8_bestcase_sse2: 38.4 ( 0.16x) vc1dsp.vc1_h_loop_filter8_bestcase_ssse3: 37.2 ( 0.16x) vc1dsp.vc1_h_loop_filter8_bestcase_sse4: 37.6 ( 0.16x) vc1dsp.vc1_h_loop_filter8_worstcase_c: 87.5 vc1dsp.vc1_h_loop_filter8_worstcase_sse2: 38.4 ( 2.28x) vc1dsp.vc1_h_loop_filter8_worstcase_ssse3: 37.6 ( 2.32x) vc1dsp.vc1_h_loop_filter8_worstcase_sse4: 37.6 ( 2.32x) vc1dsp.vc1_h_loop_filter16_bestcase_c: 11.7 vc1dsp.vc1_h_loop_filter16_bestcase_sse2: 42.0 ( 0.28x) vc1dsp.vc1_h_loop_filter16_bestcase_ssse3: 41.4 ( 0.28x) vc1dsp.vc1_h_loop_filter16_bestcase_sse4: 44.8 ( 0.26x) vc1dsp.vc1_h_loop_filter16_worstcase_c: 167.2 vc1dsp.vc1_h_loop_filter16_worstcase_sse2: 41.8 ( 4.00x) vc1dsp.vc1_h_loop_filter16_worstcase_ssse3: 41.7 ( 3.92x) vc1dsp.vc1_h_loop_filter16_worstcase_sse4: 45.3 ( 3.69x) vc1dsp.vc1_v_loop_filter4_bestcase_c: 3.6 vc1dsp.vc1_v_loop_filter4_bestcase_ssse3: 17.1 ( 0.21x) vc1dsp.vc1_v_loop_filter4_worstcase_c: 49.3 vc1dsp.vc1_v_loop_filter4_worstcase_ssse3: 17.0 ( 2.89x) vc1dsp.vc1_v_loop_filter8_bestcase_c: 6.3 vc1dsp.vc1_v_loop_filter8_bestcase_sse2: 17.7 ( 0.36x) vc1dsp.vc1_v_loop_filter8_bestcase_ssse3: 16.8 ( 0.38x) vc1dsp.vc1_v_loop_filter8_worstcase_c: 85.8 vc1dsp.vc1_v_loop_filter8_worstcase_sse2: 17.7 ( 4.83x) vc1dsp.vc1_v_loop_filter8_worstcase_ssse3: 16.7 ( 5.12x) vc1dsp.vc1_v_loop_filter16_bestcase_c: 12.7 vc1dsp.vc1_v_loop_filter16_bestcase_sse2: 26.4 ( 0.48x) vc1dsp.vc1_v_loop_filter16_bestcase_ssse3: 24.0 ( 0.53x) vc1dsp.vc1_v_loop_filter16_worstcase_c: 170.1 vc1dsp.vc1_v_loop_filter16_worstcase_sse2: 25.7 ( 6.63x) vc1dsp.vc1_v_loop_filter16_worstcase_ssse3: 25.2 ( 6.75x) New benchmarks: vc1dsp.vc1_h_loop_filter4_bestcase_c: 3.0 vc1dsp.vc1_h_loop_filter4_bestcase_ssse3: 32.4 ( 0.09x) vc1dsp.vc1_h_loop_filter4_worstcase_c: 42.3 vc1dsp.vc1_h_loop_filter4_worstcase_ssse3: 32.7 ( 1.29x) vc1dsp.vc1_h_loop_filter8_bestcase_c: 6.1 vc1dsp.vc1_h_loop_filter8_bestcase_sse2: 37.1 ( 0.17x) vc1dsp.vc1_h_loop_filter8_bestcase_ssse3: 36.4 ( 0.17x) vc1dsp.vc1_h_loop_filter8_bestcase_sse4: 36.6 ( 0.17x) vc1dsp.vc1_h_loop_filter8_worstcase_c: 87.2 vc1dsp.vc1_h_loop_filter8_worstcase_sse2: 36.9 ( 2.36x) vc1dsp.vc1_h_loop_filter8_worstcase_ssse3: 35.8 ( 2.35x) vc1dsp.vc1_h_loop_filter8_worstcase_sse4: 36.7 ( 2.38x) vc1dsp.vc1_h_loop_filter16_bestcase_c: 12.0 vc1dsp.vc1_h_loop_filter16_bestcase_sse2: 40.0 ( 0.30x) vc1dsp.vc1_h_loop_filter16_bestcase_ssse3: 39.8 ( 0.30x) vc1dsp.vc1_h_loop_filter16_bestcase_sse4: 44.4 ( 0.27x) vc1dsp.vc1_h_loop_filter16_worstcase_c: 166.4 vc1dsp.vc1_h_loop_filter16_worstcase_sse2: 39.9 ( 4.17x) vc1dsp.vc1_h_loop_filter16_worstcase_ssse3: 39.7 ( 4.19x) vc1dsp.vc1_h_loop_filter16_worstcase_sse4: 43.8 ( 3.80x) vc1dsp.vc1_v_loop_filter4_bestcase_c: 3.6 vc1dsp.vc1_v_loop_filter4_bestcase_ssse3: 16.3 ( 0.22x) vc1dsp.vc1_v_loop_filter4_worstcase_c: 49.3 vc1dsp.vc1_v_loop_filter4_worstcase_ssse3: 16.2 ( 3.04x) vc1dsp.vc1_v_loop_filter8_bestcase_c: 6.4 vc1dsp.vc1_v_loop_filter8_bestcase_sse2: 16.3 ( 0.39x) vc1dsp.vc1_v_loop_filter8_bestcase_ssse3: 15.8 ( 0.40x) vc1dsp.vc1_v_loop_filter8_worstcase_c: 85.7 vc1dsp.vc1_v_loop_filter8_worstcase_sse2: 16.3 ( 5.24x) vc1dsp.vc1_v_loop_filter8_worstcase_ssse3: 15.8 ( 5.42x) vc1dsp.vc1_v_loop_filter16_bestcase_c: 12.7 vc1dsp.vc1_v_loop_filter16_bestcase_sse2: 24.7 ( 0.52x) vc1dsp.vc1_v_loop_filter16_bestcase_ssse3: 22.7 ( 0.56x) vc1dsp.vc1_v_loop_filter16_worstcase_c: 169.4 vc1dsp.vc1_v_loop_filter16_worstcase_sse2: 24.1 ( 7.03x) vc1dsp.vc1_v_loop_filter16_worstcase_ssse3: 24.6 ( 6.88x) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides means to alter decoded audio and video through a directed graph of connected filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements 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.
- Additional small tools such as
aviocat,ismindexandqt-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.