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Claudio Freire 62dfe1d40d avcodec/aacenc_is: replace pow(x, 0.75) by x/sqrtf(sqrtf(x))

This is quite an accurate approximation; testing shows ~ 2ulp error in
the floating point result. Tested with FATE.

Alternatively, if one wants "full accuracy", one can use powf, or sqrt
instead of sqrtf. With powf, one gets 1 ulp error (theoretically should be 0, as
0.75 is exactly representable) on GNU libm, with sqrt, 0 ulp error.

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

Abstracted into pos_pow34 utility function

Signed-off-by: Claudio Freire <klaussfreire@gmail.com>

2016-01-14 00:38:22 -03:00

compat

os2threads: Add pthread_once()

2015-11-12 22:31:46 +01:00

doc

avfilter/avf_showspectrum: add posibility to display phase

2016-01-12 21:21:50 +01:00

libavcodec

avcodec/aacenc_is: replace pow(x, 0.75) by x/sqrtf(sqrtf(x))

2016-01-14 00:38:22 -03:00

libavdevice

Correct two build/built typos

2016-01-11 20:53:11 -08:00

libavfilter

avfilter/avf_showspectrum: reduce number of operations

2016-01-12 21:21:50 +01:00

libavformat

avformat/hls: forbid all protocols except http(s) & file

2016-01-14 00:18:00 +01:00

libavresample

Merge commit 'cc4c24208159200b7aff5b5c313903c7f23fa345'

2016-01-02 10:13:58 +01:00

libavutil

lavu/libm: add isfinite fallback

2016-01-13 20:00:19 -05:00

libpostproc

Merge commit 'e88103a7f92cf27a2868b50acc8a9912f6088249'

2015-09-05 21:35:46 +02:00

libswresample

swr/resample: use av_clip_int16 instead of av_clip

2015-12-24 11:29:52 -08:00

libswscale

swscale/utils: Use normal bilinear scaler if fast cannot be used due to tiny dimensions

2016-01-04 23:54:11 +01:00

presets

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tests

AAC encoder: fix I/S relative error evaluation

2016-01-13 05:28:34 -03:00

tools

avcodec: Remove libstagefright

2016-01-06 16:43:06 +00:00

.gitattributes

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.gitignore

gitignore: ignore object file temporaries

2015-10-10 20:30:41 +02:00

.travis.yml

Merge commit 'eda183287489b2c705843aa373a19c4e46fb2fec'

2015-11-22 17:12:24 +00:00

arch.mak

mips: rename mipsdspr1 to mipsdsp

2015-12-04 02:35:42 +01:00

Changelog

avcodec: Remove libstagefright

2016-01-06 16:43:06 +00:00

cmdutils_common_opts.h

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cmdutils_opencl.c

all: use FFDIFFSIGN to resolve possible undefined behavior in comparators

2015-11-03 16:28:30 -05:00

cmdutils.c

cosmetics: Fix weird indentations

2015-12-07 10:43:43 -08:00

cmdutils.h

cmdutils: remove sws_opts usage, simplify code

2015-08-08 16:51:25 +02:00

common.mak

Merge commit '9f57f134c19773d54269b6cb9ee455ff87c2e9e1'

2015-12-05 12:21:33 +01:00

configure

lavu/libm: add isfinite fallback

2016-01-13 20:00:19 -05:00

COPYING.GPLv2

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COPYING.GPLv3

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COPYING.LGPLv2.1

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COPYING.LGPLv3

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CREDITS

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ffmpeg_dxva2.c

ffmpeg_dxva2: support vp9 hwaccel

2015-12-07 09:47:51 +01:00

ffmpeg_filter.c

ffmpeg_filter: remove redundant null ptr check

2015-11-11 01:51:52 +01:00

ffmpeg_opt.c

ffmpeg: use lavf API for applying bitstream filters

2015-12-28 08:34:30 -06:00

ffmpeg_qsv.c

Merge commit 'fb472e1a11a4e0caed2c3c91da01ea8e35d9e3f8'

2015-10-22 16:18:02 +02:00

ffmpeg_vdpau.c

ffmpeg_vdpau: Ignore decoder's max supported level

2015-08-16 15:02:33 -07:00

ffmpeg_videotoolbox.c

ffmpeg/videotoolbox: protect UTGetOSTypeFromString on both VDA and VT

2015-10-15 10:22:31 +02:00

ffmpeg.c

ffmpeg: check fclose return values

2016-01-07 16:57:37 -08:00

ffmpeg.h

ffmpeg: use lavf API for applying bitstream filters

2015-12-28 08:34:30 -06:00

ffplay.c

Revert "ffplay: Fix auto insertion point of rotation filter"

2015-12-28 03:44:31 +01:00

ffprobe.c

ffprobe: avoid unnecessary pow and exp2 calls

2015-12-29 08:59:16 -08:00

ffserver_config.c

ffserver_config: check for INT_MIN before doing FFABS

2015-10-13 19:40:09 -04:00

ffserver_config.h

ffserver: Use singlejpeg muxer for jpeg

2015-06-08 03:36:22 +02:00

ffserver.c

ffserver: Cast time_t value when using it in a format string.

2015-12-29 16:00:34 +01:00

INSTALL.md

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library.mak

build: add LDLIBFLAGS

2015-07-08 14:35:02 +02:00

LICENSE.md

avfilter: add rubberband wrapper

2015-09-20 19:54:57 +02:00

MAINTAINERS

avcodec: Remove libstagefright

2016-01-06 16:43:06 +00:00

Makefile

mips: rename mipsdspr1 to mipsdsp

2015-12-04 02:35:42 +01:00

README.md

README: replace http with https

2015-10-06 13:27:29 +02:00

RELEASE

RELEASE: update to 2.8.git

2015-09-09 23:53:15 -03:00

version.sh

version.sh: add note that ffversion.h is auto-generated

2015-10-25 10:14:44 -04:00

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. Few developers follow pull requests so they will likely be ignored.

Languages

C 90.3%

Assembly 7.8%

Makefile 1.3%

C++ 0.2%

Objective-C 0.2%

Other 0.1%