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wm4 3909e4cdfc filter_kernels: replace AGG-based code 
This commit replaces code based on AGG, taken from this source file:

http://vector-agg.cvs.sourceforge.net/viewvc/vector-agg/agg-2.5/include/agg_image_filters.h

The intention is that filter_kernels.c can be relicensed to LGPL or BSD.
Because the AGG author died, full replacement is the only way to achieve
it.

This affects only some filter functions. These are exclusively
mathematical functions for computing filter coefficients. (Other parts
in filter_kernel.c were originally written by me, with heavy additions
and refactoring done by other mpv contributors.) While the code is
mostly just well-known mathematical formulas written down in C form,
AGG copyright could perhaps be claimed anyway.

To remove the AGG code, I replaced it with the filter functions from:

https://github.com/glumpy/glumpy/blob/master/glumpy/library/build-spatial-filters.py

These functions conveniently compute exactly the same thing in mpv,
Glumpy, AGG (and about anything that will filter images using the same
mathematical principles).

First I ported the Python code in the file to C. Then I replaced all
functions in filter_kernels.c with this code that could be replaced.
Then I investigated whether the remaining functions were based on AGG
code and took appropriate action:

hanning(), hamming(), quadric(), bicubic(), kaiser(), blackman(),
spline16(), spline36(), gaussian(), sinc() were taken straight from
Glumpy.

For sinc(), re-add the "fabs(x) < 1e-8" check, which was added in commit
586dc557 for unknown reasons.

gaussian() loses its filter parameter for some reason. (Well, who cares,
not my problem.)

The really awkward thing is that the text for hanning() and hamming()
does not change. In theory these functions are now based on Glumpy code,
but it seems like this can be neither proven nor denied. (The same
happened in some other cases with at least a few lines of code.)

sphinx() was added in commit 586dc557, and looks suspiciously like
sinc() as well. Replace the first 3 lines of the body with the ported
function (of which 2 lines do not change; the first uses code only in
mpv, and the second is just "return 1.0;"). The 4th line is only similar
on an abstract level (and that because of the mathematical relation
between these functions). Although the original sinc() was probably used
as template for it, with the other lines replaced, I don't think you
could make the claim that it falls under AGG copyright.

jinc() was added in commit 26baf5b9, but the code for it might be based
on sinc(). Rewrite it based on the "new" sinc(). Some of the same
remarks as with sphinx() apply.

cubic_bc() was ported from Glumpy's Mitchell(). (As far as I'm aware,
with the default parameters it's called "the" Mitchell-Netravali filter,
but in mpv this function is used to generate a whole group of filters.)

spline64() was added in commit a8b67c66, and was probably derived from
spline36(). Re-derive it from the "new" spline36().

triangle() could be considered derived from the original bilinear().
This is this in the original commit:

    static double bilinear(kernel *k, double x)
    {
        return 1.0 - x;
    }

This _might_ be based on AGG's image_filter_bilinear:

    struct image_filter_bilinear
    {
        static double radius() { return 1.0; }
        static double calc_weight(double x)
        {
            return 1.0 - x;
        }
    };

Considering that the "framework" was written by me, and the only part
from AGG taken is "return 1.0 - x;", and this part is trivial and was
later thoroughly replaced, this is probably not under the AGG copyright.

I'm hoping this doesn't introduce regressions. But the main focus is not
being productive anyway, and I didn't rigorously check unintended
changes in functionality.
 		2016-01-06 18:46:56 +01:00
DOCS ao_dsound: remove this audio output 2016-01-06 13:52:15 +01:00
TOOLS bundle: remove git sha from the Info.plist version 2016-01-05 12:27:04 +01:00
audio ao_dsound: remove this audio output 2016-01-06 13:52:15 +01:00
common command: replace ROUND() with lrint() 2015-12-26 18:36:45 +01:00
demux demux_lavf: re-enable codepage autodetection for .ass 2016-01-04 19:19:00 +01:00
etc example.conf: minor changes 2015-12-29 01:42:31 +01:00
input demux: remove weird tripple-buffering for the sh_stream list 2015-12-23 21:52:16 +01:00
libmpv Fix some typos in code comments 2015-12-21 22:28:12 +01:00
misc charset_conv: check for UTF-8 if uchardet returns unknown 2015-12-20 20:55:24 +01:00
options options: raise maximum value for --audio-samplerate 2016-01-05 19:15:21 +01:00
osdep Update copyright year 2016-01-01 00:18:40 +01:00
player audio: update outdated comment 2016-01-05 22:08:51 +01:00
stream stream_lavf: remove tabs 2015-12-22 23:18:46 +01:00
sub sd_ass: fix memory leaks with --sub-ass=no 2016-01-04 15:29:29 +01:00
ta ta: add another array helper macro 2015-06-01 01:35:56 +02:00
test chmap_sel: prefer inexact equivalents over perfect upmix 2016-01-04 19:17:56 +01:00
video filter_kernels: replace AGG-based code 2016-01-06 18:46:56 +01:00
waftools win32: build: set subsystem version 2015-12-20 21:06:02 +11:00
.gitignore .gitignore: add nnedi3_weights.inc 2015-11-18 20:34:30 +01:00
.travis.yml
…
CONTRIBUTING.md CONTRIBUTING: discourage reports against unmaintained releases 2016-01-03 15:42:02 +01:00
Copyright vo_opengl: require --enable-gpl3 for nnedi 2015-12-03 09:32:40 +01:00
LICENSE
…
README.md README: remove pointer to homebrew-mpv 2015-12-26 23:04:04 +01:00
bootstrap.py build: update waf to 1.8.12 2015-07-18 21:37:30 +02:00
talloc.h
…
travis-deps
…
version.sh build: don't make version.sh create version.h by default 2015-07-14 23:11:06 +02:00
wscript ao_dsound: remove this audio output 2016-01-06 13:52:15 +01:00
wscript_build.py ao_dsound: remove this audio output 2016-01-06 13:52:15 +01:00

README.md

http://mpv.io/

mpv

Overview

mpv is a media player based on MPlayer and mplayer2. It supports a wide variety of video file formats, audio and video codecs, and subtitle types.

Releases can be found on the release list.

System requirements

  • A not too ancient Linux, or Windows Vista or later, or OSX 10.8 or later.
  • A somewhat capable CPU. Hardware decoding might sometimes help if the CPU is too slow to decode video realtime, but must be explicitly enabled with the --hwdec option. On Windows, a CPU with SSE4 instruction set is required to get decent hardware decoding performance.
  • A not too crappy GPU. mpv is not intended to be used with bad GPUs. There are many caveats with drivers or system compositors causing tearing, stutter, etc. On Windows, you might want to make sure the graphics drivers are current, especially OpenGL. In some cases, ancient fallback video output methods can help (such as --vo=xv on Linux), but this use is not recommended or supported.

Downloads

For semi-official builds and third-party packages please see mpv.io.

Compilation

Compiling with full features requires development files for several external libraries. Below is a list of some important requirements.

The mpv build system uses waf but we don't store it in your source tree. The script './bootstrap.py' will download the latest version of waf that was tested with the build system.

For a list of the available build options use ./waf configure --help. If you think you have support for some feature installed but configure fails to detect it, the file build/config.log may contain information about the reasons for the failure.

NOTE: To avoid cluttering the output with unreadable spam, --help only shows one of the two switches for each option. If the option is autodetected by default, the --disable-*** switch is printed; if the option is disabled by default, the --enable-*** switch is printed. Either way, you can use --enable-*** or --disable-** regardless of what is printed by --help.

To build the software you can use ./waf build: the result of the compilation will be located in build/mpv. You can use ./waf install to install mpv to the prefix after it is compiled.

Essential dependencies (incomplete list):

  • gcc or clang
  • X development headers (xlib, X extensions, libvdpau, libGL, libXv, ...)
  • Audio output development headers (libasound/ALSA, pulseaudio)
  • FFmpeg libraries (libavutil libavcodec libavformat libswscale libavfilter and either libswresample or libavresample) At least FFmpeg 2.4.0 or Libav 11 is required.
  • zlib
  • iconv (normally provided by the system libc)
  • libass (OSD, OSC, text subtitles)
  • Lua (optional, required for the OSC pseudo-GUI and youtube-dl integration)
  • libjpeg (optional, used for screenshots only)
  • uchardet (optional, for subtitle charset detection)
  • vdpau and vaapi libraries for hardware decoding on Linux (optional)

Libass dependencies:

  • gcc or clang, yasm on x86 and x86_64
  • fribidi, freetype, fontconfig development headers (for libass)
  • harfbuzz (optional, required for correct rendering of combining characters, particularly for correct rendering of non-English text on OSX, and Arabic/Indic scripts on any platform)

FFmpeg dependencies:

  • gcc or clang, yasm on x86 and x86_64
  • OpenSSL (has to be explicitly enabled when compiling ffmpeg)
  • libx264/libmp3lame/libfdk-aac if you want to use encoding (has to be explicitly enabled when compiling ffmpeg)
  • Libav also works, but some features will not work. (See section below.)

Most of the above libraries are available in suitable versions on normal Linux distributions. However FFmpeg is an exception (distro versions may be too old to work at all or work well). For that reason you may want to use the separately available build wrapper (mpv-build) that first compiles FFmpeg libraries and libass, and then compiles the player statically linked against those.

If you want to build a Windows binary, you either have to use MSYS2 and MinGW, or cross-compile from Linux with MinGW. See Windows compilation.

FFmpeg vs. Libav

Generally, mpv should work with the latest release as well as the git version of both FFmpeg and Libav. But FFmpeg is preferred, and some mpv features work with FFmpeg only (subtitle formats in particular).

Release cycle

Every few months, a new release is cut off of the master branch and is assigned a 0.X.0 version number.

As part of the maintenance process, minor releases are made, which are assigned 0.X.Y version numbers. Minor releases contain bug fixes only. They never merge the master branch, and no features are added to it. Only the latest release is maintained.

The goal of releases is to provide stability and an unchanged base for the sake of Linux distributions. If you want the newest features, just use the master branch, which is stable most of the time, except sometimes, when it's not.

Releases other than the latest release are unsupported and unmaintained.

See the release policy document for more information.

Bug reports

Please use the issue tracker provided by GitHub to send us bug reports or feature requests.

Contributing

For small changes you can just send us pull requests through GitHub. For bigger changes come and talk to us on IRC before you start working on them. It will make code review easier for both parties later on.

Relation to MPlayer and mplayer2

mpv is based on mplayer2, which in turn is based on the original MPlayer (also called mplayer, mplayer-svn, mplayer1). Many changes have been made, a large part of which is incompatible or completely changes how the player behaves. Although there are still many similarities to its ancestors, mpv should generally be treated as a completely different program.

mpv was forked because we wanted to modernize MPlayer. This includes removing cruft (including features which stopped making sense 10 years ago), and of course adding modern features. Such huge and intrusive changes made it infeasible to work directly with MPlayer, which is mostly focused on preservation, so a fork had to be made. (Actually, mpv is based on mplayer2, which already started this process of removing cruft.)

In general, mpv should be considered a completely new program, rather than a MPlayer drop-in replacement.

If you are wondering what's different from mplayer2 and MPlayer, an incomplete list of changes is located here.

Contact

Most activity happens on the IRC channel and the github issue tracker. The mailing lists are mostly unused.

  • GitHub issue tracker: issue tracker (report bugs here)
  • User IRC Channel: #mpv on irc.freenode.net
  • Developer IRC Channel: #mpv-devel on irc.freenode.net

To contact the mpv team in private write to mpv-team@googlegroups.com. Use only if discretion is required.

License

Mostly GPLv2 or later. See details.