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https://github.com/mpv-player/mpv
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386e8cd16d
There has been no new developments or agreements, but I was uncertain about the copyright status of them. Thus this part of code was marked as being potentially GPL, and was not built in LGPL mode. Now I've taken a close look again, and decided that these can be relicensed using the existing relicensing agreements. OSD level 3 was introduced in commit8d190244, with the author being unreachable. As I decided in commit6ddd95fd, OSD level 3 itself can be kept, but the "osd" command had to go, and the "rendering" of OSD level 3 (the HAVE_GPL code in osd.c) was uncertain. But the code for this was rewritten: instead of duplicating the time/percent formatting code, it was changed to use common code, and some weird extra logic was removed. The code inside of the "if" is exactly the same as the code that formats the OSD status line (covered by LGPL relicensing). The current commands for adding/removing sub/audio tracks more or less originated from commit2f376d1b39, with the author being unreachable. But the original code was very different, mostly due to MPlayer's incredibly messy handling of subtitles in general. Nothing of this remains in the current code. Even the command declarations were rewritten. The commands (as seen from the user side) are rather similar in naming and semantics, but we don't consider this copyrightable. So it doesn't look like anything copyrightable is left. The add/cycle commands were more or less based on step_property, introduced in commit7a71da01d6, with the patch author disagreeing with the LGPL relicensing. But all code original to the patch has been replaced in later mpv changes, and the original code was mostly copied from MP_CMD_SET_PROPERTY anyway. The underlying property interface was completely changed, the error handling was redone, and all of this is very similar to the changes that were done on SET_PROPERTY. The command declarations are completely different in the first place, because the semantic change from step to add/cycle. The commit also seems to have been co-authored by reimar to some degree. He also had the idea to change the original patch from making the command modify a specific property to making it generic. (The error message line, especially with its %g formatting, might contain some level of originality, so change that just to be sure. This commit Copies and adapts the error message for SET_PROPERTY.) Although I'm a bit on the fence with all the above things, it really doesn't look like there's anything substantial that would cause issues. I thus claim that there is no problem with changing the license to LGPL for the above things. It's probably still slightly below the standard that was usually applied in the code relicensing in mpv, but probably still far above to the usual in open source relicensing (and above commercial standards as well, if you look what certain tech giants do).
114 lines
5.7 KiB
Plaintext
114 lines
5.7 KiB
Plaintext
mpv is a fork of mplayer2, which is a fork of MPlayer.
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mpv as a whole is licensed under the GNU General Public License GPL version 2
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or later (called GPLv2+ in this document, see LICENSE.GPL for full license
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text) by default, or the GNU Lesser General Public License LGPL version 2 or
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later (LGPLv2.1+ in this document, see LICENSE.LGPL for full license text) if
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built with the --enable-lgpl configure switch.
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Most source files are LGPLv2.1+ or GPLv2+, but some files are available under
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more liberal licenses, such as BSD, MIT, ISC, and possibly others. Look at the
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copyright header of each source file, and grep the sources for "Copyright" if
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you need to know details. C source files without Copyright notice are usually
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licensed as LGPLv2.1+. Also see the list of files with specific licenses below
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(not all files can have a standard license header).
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All new contributions must be LGPLv2.1+ licensed. Using a more liberal license
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compatible to LGPLv2.1+ is also ok.
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If changes are done on GPL code, must come with the implicit agreement that the
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project can relicense the changes to LGPLv2.1+ at a later point without asking
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the contributor. This is a safeguard for making potential relicensing of
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remaining GPL code to LGPLv2.1+ easier.
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For information about authors and contributors, consult the git log, which
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contains the complete SVN and CVS history as well.
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"v2.1+" in this context means "version 2.1 or later".
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Some libraries are GPLv2+ or GPLv3+ only. Building mpv with Samba support makes
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it GPLv3+.
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mpv can be built as LGPLv2.1+ with the --enable-lgpl configure option. To add
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a LGPL mode to mpv, MPlayer code had to be relicensed from GPLv2+ to LGPLv2.1+
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by asking the MPlayer authors for permission. Since permission could not be
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obtained from everyone, LGPL mode disables the following features, some of
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them quite central:
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- no audio filtering, which breaks: --volume, --af, replaygain, pitch
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correction, fine control about downmix/upmix/resampling behavior
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- Linux X11 video output
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- BSD audio output via OSS
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- NVIDIA/Linux hardware decoding (vdpau, although CUDA usually works)
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- many builtin video filters (use libavfilter instead)
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- automatic rotation and stereoscopic video handling
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- Linux TV input
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- video format conversion (if not supported by the VO)
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- minor features: jack, DVD, CDDA, SMB, CACA, legacy direct3d VO
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Some of these will be fixed in the future. The intended use for LGPL mode is
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with libmpv, and currently it's not recommended to build mpv CLI in LGPL mode
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at all.
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The following files are still GPL only (--enable-lgpl disables them):
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audio/filter/* will be replaced with new filter chain
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audio/filter/af_format.c mostly LGPL (except af glue code)
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audio/filter/af_lavc3enc.c as above
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audio/filter/af_lavfi.c as above
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audio/filter/af_scaletempo.c as above
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audio/filter/af_rubberband.c as above
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audio/out/ao_jack.c will stay GPL
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audio/out/ao_oss.c will stay GPL
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audio/audio.* needed by af code only
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demux/demux_tv.c will stay GPL
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stream/ai_* will stay GPL (TV code)
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stream/audio_in.* will stay GPL (TV code)
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stream/dvb* must stay GPL
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stream/frequencies.* must stay GPL
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stream/stream_cdda.c unknown
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stream/stream_dvb.* must stay GPL
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stream/stream_dvd.c unknown
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stream/stream_dvd_common.* unknown
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stream/stream_dvdnav.c unknown
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stream/stream_smb.c will stay GPLv3
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stream/stream_tv.c will stay GPL
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stream/tv* will stay GPL
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video/filter/vf_crop.c will be deleted
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video/filter/vf_dsize.c will be deleted
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video/filter/vf_expand.c will be deleted
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video/filter/vf_flip.c will be deleted
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video/filter/vf_format.c will be deleted
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video/filter/vf_gradfun.c will be deleted
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video/filter/vf_mirror.c will be deleted
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video/filter/vf_noformat.c will be deleted
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video/filter/vf_pullup.c will be deleted
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video/filter/vf_rotate.c will be deleted
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video/filter/vf_scale.c will be deleted
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video/filter/vf_stereo3d.c will be deleted
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video/filter/vf_sub.c will be deleted
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video/filter/vf_yadif.c will be deleted
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video/out/opengl/hwdec_vaglx.c GPL
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video/out/vo_caca.c unknown
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video/out/vo_direct3d.c unknown
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video/out/vo_vaapi.c probably impossible (some company's code)
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video/out/vo_vdpau.c probably impossible (nVidia's code)
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video/out/vo_x11.c probably impossible
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video/out/vo_xv.c probably impossible
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video/out/x11_common.* probably impossible
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video/vdpau.c hard (GPL-only parts must be ifdefed)
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video/vdpau.h unknown
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video/vdpau_mixer.* actual code must be rewritten
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DOCS/man/ GPLv2+
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bootstrap.py unknown license, probably GPLv2+ or LGPLv2+
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etc/mplayer-input.conf unknown license, probably GPLv2+
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mpv.desktop unknown license, probably GPLv2+
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etc/restore-old-bindings.conf unkniwn license, probably GPLv2+
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The following files contain some optional GPL code (--enable-lgpl disables it):
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options/parse_commandline.c dvd:// expansion
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player/audio.c libaf glue code
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None of the exceptions listed above affect the final binary if it's built as
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LGPL. Linked libraries still can affect the final license (for example if
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FFmpeg was built as GPL).
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