build: add preliminary LGPL mode

See "Copyright" file for caveats.

This changes the remaining "almost LGPL" files to LGPL, because we think
that the conditions the author set for these was finally fulfilled.

19 files changed, 183 insertions, 389 deletions

diff --git a/Copyright b/Copyright
index cf025070d7..fc51b0e1f0 100644
--- a/Copyright
+++ b/Copyright
@@ -11,7 +11,7 @@ files can have a standard license header).
 All new contributions must be LGPLv2.1+ licensed, or if the changes are done on
 GPL code, must come with the implicit agreement that the project can relicense
 the code to LGPLv2.1+ at a later point without asking the contributor. (This
-is a safeguard for making potential relicensing of the project to LGPLv2.1+
+is a safeguard for making potential relicensing of remaining code to LGPLv2.1+
 easier.) Using a more liberal license compatible to LGPLv2.1+ is also ok.
 
 For information about authors and contributors, consult the git log, which
@@ -31,6 +31,28 @@ under mplayer2, and has been removed from mpv.
 Some libraries are GPLv2+ or GPLv3+ only. Building mpv with Samba support makes
 it GPLv3+.
 
+mpv can be built as LGPLv3+ with the --enable-preliminary-lgpl3 configure
+option. This is a very new switch and it hasn't been confirmed yet whether
+really all GPL code is excluded (thus preliminary). In addition, it disables
+a number of useful features, some of them quite central:
+- no audio filtering, which breaks: --volume, --af, replaygain, pitch
+  correction, fine control about downmix/upmix/resampling behavior
+- Linux X11 video output
+- Linux audio output via ALSA (PulseAudio works)
+- BSD audio output via OSS
+- Linux hardware decoding (vaapi, vdpau)
+- many builtin video filters (use libavfilter instead)
+- automatic rotation and stereoscopic video handling
+- Linux TV input
+- the --frames option
+- the add/cycle and sub-add/audio-add/sub-remove/audio-remove commands
+- video format conversion (if not supported by the VO)
+- minor features: jack, DVD, CDDA, SMB, CACA, legacy direct3d VO
+Some of these will be fixed in the future. The lack of the add/cycle commands
+makes this particularly useless for CLI mode, and most of the appeal of LGPL
+is for libmpv anyway. Thus it's not recommended to build mpv CLI in LGPL mode
+at all.
+
 Source files with specific licenses:
 - etc/input.conf is LGPLv2.1+
 - etc/builtin.conf is LGPLv2.1+
@@ -43,251 +65,43 @@ Source files with specific licenses:
 - bootstrap.py is unknown (probably GPLv2+ or LGPLv2+)
 - the build system (wscript, waftools/*) is LGPLv2+, some parts BSD
 
-Some files are marked with "Almost LGPL." These files are GPL, but all authors
-have agreed to relicense them to LGPL. the problem is that one of the authors is
-Michael Niedermayer, who cited the following conditions for relicensing:
-
-  http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2016-September/073535.html
-
-We assume the first 3 conditions are fulfilled. The last condition can be
-interpreted as that his code can be changed to LGPL only as soon as the "core"
-of mpv changes to LGPL. We interpret "core" as something minimal, that can
-actually be built and run, with all GPL code disabled.
-
 Some files are LGPLv3+. This is due to the contributions of a single developer
 going by the SVN username "iive". The chosen license of this project is
 LGPLv2.1+. The affected files will be changed to LGPLv2.1+ at the earliest
 opportunity, for example if his contributions disappear by being replaced
 or removed. All new contributions to these files are implied to be LGPLv2.1+.
 
-LGPL relicensing status. Files which require some sort of action to get a basic
-LGPL player core (relicensing, replacement, or partial/full rewrites) are marked
-with an "x".
+The following files are still GPL:
 
-    audio/decode/ad.h               LGPL
-    audio/decode/ad_lavc.c          LGPL
-    audio/decode/ad_spdif.c         LGPL
-    audio/decode/dec_audio.*        LGPL
-x   audio/filter/af.*               must be killed (main author disagreed)
-        (required for LGPL core: a new filter chain must be written)
-    audio/filter/af_channel.c       must be killed (main author disagreed)
-    audio/filter/af_equalizer.c     must be killed (main author disagreed)
-    audio/filter/af_pan.c           must be killed (main author disagreed)
-    audio/filter/af_volume.c        must be killed (main author disagreed)
-    audio/filter/equalizer.h        must be killed (main author disagreed)
-    audio/filter/tools.c            must be killed (main author disagreed)
-    audio/filter/af_format.c        LGPL
-    audio/filter/af_lavc3enc.c      LGPL
-    audio/filter/af_lavfi.c         LGPL
-    audio/filter/af_scaletempo.c    LGPL
-    audio/filter/af_rubberband.c    LGPL
-    audio/out/ao.c                  LGPL
-    audio/out/ao.h                  LGPL
-    audio/out/ao_alsa.c             extremely hard (original author did not decide)
-    audio/out/ao_audiounit.m        LGPL
-    audio/out/ao_coreaudio.c        LGPL
-    audio/out/ao_coreaudio_chmap.c  LGPL
-    audio/out/ao_coreaudio_chmap.h  LGPL
-    audio/out/ao_coreaudio_exclusiv LGPL
-    audio/out/ao_coreaudio_properti LGPL
-    audio/out/ao_coreaudio_properti LGPL
-    audio/out/ao_coreaudio_utils.c  LGPL
-    audio/out/ao_coreaudio_utils.h  LGPL
+    audio/filter/*                  will be replaced with new filter chain
+    audio/filter/af_format.c        mostly LGPL (except af glue code)
+    audio/filter/af_lavc3enc.c          as above
+    audio/filter/af_lavfi.c             as above
+    audio/filter/af_scaletempo.c        as above
+    audio/filter/af_rubberband.c        as above
+    audio/out/ao_alsa.c             chaotic history, original author did not decide
     audio/out/ao_jack.c             will stay GPL
-    audio/out/ao_lavc.c             LGPL
-    audio/out/ao_null.c             LGPL
-    audio/out/ao_openal.c           LGPL
-    audio/out/ao_opensles.c         LGPL
     audio/out/ao_oss.c              will stay GPL
-    audio/out/ao_pcm.c              LGPL
-    audio/out/ao_pulse.c            LGPL
-    audio/out/ao_rsound.c           LGPL
-    audio/out/ao_sdl.c              LGPL
-    audio/out/ao_sndio.c            LGPL (BSD)
-    audio/out/ao_wasapi.c           LGPL
-    audio/out/ao_wasapi_changenotif LGPL
-    audio/out/ao_wasapi.h           LGPL
-    audio/out/ao_wasapi_utils.c     LGPL
-    audio/out/internal.h            LGPL
-    audio/out/pull.c                LGPL
-    audio/out/push.c                LGPL
-x   audio/audio.*                   very hard (mp_audio based of anders' af_audio)
-        (required for LGPL core: determine if the struct can be used anyway, or
-         devise a cheap AVFrame wrapper)
-    audio/audio_buffer.*            LGPL
-    audio/chmap.*                   LGPL
-    audio/chmap_sel.*               LGPL
-    audio/fmt-conversion.*          LGPL
-    audio/format.*                  LGPL
-    common/av_common.*              LGPL
-    common/av_log.c                 almost LGPL
-    common/av_log.h                 LGPL
-    common/codecs.*                 LGPL
-    common/common.*                 LGPL
-    common/encode.h                 LGPL
-    common/encode_lavc.*            LGPL
-    common/global.h                 LGPL
-    common/msg.c                    almost LGPL
-    common/msg_control.h            LGPL
-    common/msg.h                    LGPL
-    common/playlist.*               LGPL
-    common/recorder.*               LGPL
-    common/tags.*                   LGPL
-    common/version.c                LGPL
-    demux/codec_tags.*              LGPL
-    demux/cue.*                     LGPL
-    demux/demux.*                   LGPL
-    demux/demux_cue.c               LGPL
-    demux/demux_disc.c              LGPL
-    demux/demux_edl.c               LGPL
-    demux/demux_lavf.c              almost LGPL
-    demux/demux_libarchive.c        LGPL
-    demux/demux_mf.c                LGPLv3+
-    demux/demux_mkv.c               LGPL (mostly)
-    demux/demux_mkv_timeline.c      LGPL
-    demux/demux_null.c              LGPL
-    demux/demux_playlist.c          LGPL
-    demux/demux_rar.c               LGPL
-    demux/demux_raw.c               almost LGPL
-    demux/demux_timeline.c          LGPL
+    audio/audio.*                   needed by af code only
     demux/demux_tv.c                will stay GPL
-    demux/ebml.*                    LGPL
-    demux/matroska.h                LGPL
-    demux/packet.*                  LGPL
-    demux/stheader.h                LGPL
-    demux/timeline.*                LGPL
-    input/cmd_*                     LGPL
-    input/event.*                   LGPL
-    input/input.*                   LGPL
-    input/ipc.c                     LGPL
-    input/ipc-unix.c                LGPL
-    input/ipc-win.c                 LGPL
-    input/keycodes.*                LGPL
-    input/pipe-win32.c              LGPL
-    libmpv/*.*                      LGPL
-    misc/*.*                        LGPL
-    options/m_config.*              LGPL
-    options/m_option.c              almost LGPL
-    options/m_option.h              LGPL
-    options/m_property.*            LGPL
-    options/options.*               LGPL
-    options/parse_commandline.*     LGPL
-    options/parse_configfile.*      LGPL
-    options/path.*                  LGPL
-    osdep/android/*                 LGPL (BSD)
-    osdep/ar/*                      LGPL (BSD)
-    osdep/atomic.h                  LGPL
-    osdep/compiler.h                LGPL
-    osdep/endian.h                  LGPL
-    osdep/glob-win.c                LGPL
-    osdep/io.*                      LGPL
-    osdep/macosx_application.h      LGPL
-    osdep/macosx_application.m      LGPL
-    osdep/macosx_application_objc.h LGPL
-    osdep/macosx_compat.h           LGPL
-    osdep/macosx_events.*           LGPL
-    osdep/macosx_events_objc.h      LGPL
-    osdep/macosx_touchbar.*         LGPL
-    osdep/macosx_versions.h         LGPL
-    osdep/main-fn-cocoa.c           LGPL
-    osdep/main-fn.h                 LGPL
-    osdep/main-fn-unix.c            LGPL
-    osdep/main-fn-win.c             LGPL
-    osdep/mpv.exe.manifest          LGPL
-    osdep/mpv.rc                    LGPL
-    osdep/path.h                    LGPL
-    osdep/path-macosx.m             LGPL
-    osdep/path-unix.c               LGPL
-    osdep/path-win.c                LGPL
-    osdep/semaphore.h               LGPL
-    osdep/semaphore_osx.c           LGPL
-    osdep/strnlen.h                 LGPL
-    osdep/subprocess.*              LGPL
-    osdep/subprocess-posix.c        LGPL
-    osdep/subprocess-win.c          LGPL
-    osdep/terminal.h                LGPL
-    osdep/terminal-unix.c           LGPL
-    osdep/terminal-win.c            LGPL
-    osdep/threads.*                 LGPL
-    osdep/timer.c                   LGPL
-    osdep/timer.h                   LGPL
-    osdep/timer-darwin.c            LGPL (MIT)
-    osdep/timer-linux.c             LGPL
-    osdep/timer-win2.c              LGPL
-    osdep/w32_keyboard.c            LGPL
-    osdep/w32_keyboard.h            LGPL
-    osdep/win32-console-wrapper.c   LGPL (BSD)
-    osdep/win32/*                   LGPL (ISC)
-    osdep/windows_utils.*           LGPL
-x   player/audio.c                  LGPL (dysfunctional due to libaf)
-    player/client.*                 LGPL (ISC)
-    player/command.c                LGPL
-    player/command.h                LGPL
-    player/configfiles.c            LGPL
-    player/core.h                   LGPL
-    player/external_files.*         LGPL
-    player/lavfi.*                  LGPL
-    player/loadfile.c               LGPL
-    player/lua/*.*                  LGPL
-    player/lua.c                    LGPL
-    player/misc.c                   LGPL
-    player/osd.c                    LGPL
-    player/playloop.c               LGPL
-    player/screenshot.*             LGPL
-    player/scripting.*              LGPL
-    player/sub.c                    LGPL
-    player/video.c                  LGPL
     stream/ai_*                     will stay GPL (TV code)
     stream/audio_in.*               will stay GPL (TV code)
-    stream/cache.c                  LGPLv3+
-    stream/cache_file.c             LGPL
-    stream/cookies.*                LGPL
     stream/dvb*                     must stay GPL
     stream/frequencies.*            must stay GPL
-    stream/rar.*                    LGPL
-    stream/stream_avdevice.c        LGPL
-    stream/stream_bluray.c          LGPL
-    stream/stream.*                 LGPL
-    stream/stream_cb.c              LGPL
     stream/stream_cdda.c            unknown
     stream/stream_dvb.*             must stay GPL
     stream/stream_dvd.c             unknown
     stream/stream_dvd_common.*      unknown
     stream/stream_dvdnav.c          unknown
-    stream/stream_edl.c             LGPL
-    stream/stream_file.c            LGPL
-    stream/stream_lavf.c            LGPL
-    stream/stream_libarchive.*      LGPL
-    stream/stream_memory.c          LGPL
-    stream/stream_mf.c              LGPL
-    stream/stream_null.c            LGPL
-    stream/stream_rar.c             LGPL
     stream/stream_smb.c             will stay GPLv3
     stream/stream_tv.c              will stay GPL
     stream/tv*                      will stay GPL
-    sub/*                           LGPL
-    ta/*                            LGPL (ISC)
-    video/decode/d3d.*              LGPL
-    video/decode/dec_video.*        almost LGPL
-    video/decode/hw_cuda.c          LGPL
-    video/decode/hw_d3d11va.c       LGPL
-    video/decode/hw_dxva2.c         LGPL
-    video/decode/hw_videotoolbox.c  LGPL
-    video/decode/lavc.h             almost LGPLv3+
-    video/decode/vd.h               LGPL
-    video/decode/vd_lavc.c          almost LGPLv3+
-    video/filter/refqueue.*         LGPL
-    video/filter/vf.c               LGPL
-    video/filter/vf.h               LGPL (mostly)
-    video/filter/vf_buffer.c        LGPL
     video/filter/vf_crop.c          will be deleted
-    video/filter/vf_d3d11vpp.c      LGPL
     video/filter/vf_dsize.c         will be deleted
     video/filter/vf_expand.c        will be deleted
     video/filter/vf_flip.c          will be deleted
     video/filter/vf_format.c        will be deleted
     video/filter/vf_gradfun.c       will be deleted
-    video/filter/vf_lavfi.*         LGPL
     video/filter/vf_mirror.c        will be deleted
     video/filter/vf_noformat.c      will be deleted
     video/filter/vf_pullup.c        will be deleted
@@ -295,57 +109,36 @@ x   player/audio.c                  LGPL (dysfunctional due to libaf)
     video/filter/vf_scale.c         will be deleted
     video/filter/vf_stereo3d.c      will be deleted
     video/filter/vf_sub.c           will be deleted
-    video/filter/vf_vapoursynth.c   LGPL
-    video/filter/vf_vavpp.c         LGPL
-    video/filter/vf_vdpaupp.c       LGPL
     video/filter/vf_yadif.c         will be deleted
-    video/csputils.*                LGPL
-    video/fmt-conversion.*          LGPL
     video/gpu_memcpy.*              will be deleted
-    video/hwdec.*                   LGPL
-    video/image_writer.*            LGPL
-    video/img_format.*              LGPL
-    video/mp_image.*                almost LGPL
-    video/mp_image_pool.*           LGPL
-    video/out/aspect.*              LGPL
-    video/out/bitmap_packer.*       LGPL
-    video/out/cocoa*                LGPL
-    video/out/d3d_shader_420p.h     LGPL
-    video/out/d3d_shader_nv12.h     LGPL
-    video/out/d3d_shader_yuv.hlsl   LGPL
-    video/out/dither.*              LGPL
-    video/out/drm_common.*          LGPL
-    video/out/filter_kernels.*      LGPL (BSD)
     video/out/opengl/hwdec_vaglx.c  GPL
-    video/out/opengl/*              LGPL
-    video/out/vo.c                  LGPL
-    video/out/vo.h                  LGPL
     video/out/vo_caca.c             unknown
     video/out/vo_direct3d.c         unknown
-    video/out/vo_drm.c              LGPL
-    video/out/vo_image.c            LGPL
-    video/out/vo_lavc.c             LGPL
-    video/out/vo_null.c             LGPL
-    video/out/vo_opengl.c           LGPL
-    video/out/vo_opengl_cb.c        LGPL
-    video/out/vo_rpi.c              LGPL
-    video/out/vo_sdl.c              LGPL
-    video/out/vo_tct.c              LGPL
     video/out/vo_vaapi.c            probably impossible (some company's code)
     video/out/vo_vdpau.c            probably impossible (nVidia's code)
-    video/out/vo_wayland.c          LGPL
     video/out/vo_x11.c              probably impossible
     video/out/vo_xv.c               probably impossible
-    video/out/w32_common.*          LGPL
-    video/out/wayland*              LGPL
-    video/out/win32/*               LGPL
-    video/out/win_state.*           LGPL
     video/out/x11_common.*          probably impossible
-    video/out/x11_icon.bin          LGPL
-    video/sws_utils.*               almost LGPL
     video/vaapi.*                   hard (GPL-only parts must be ifdefed)
     video/vdpau.c                   hard (GPL-only parts must be ifdefed)
-    video/vdpau_functions.inc       LGPL
     video/vdpau.h                   unknown
     video/vdpau_mixer.*             actual code must be rewritten
-    video/vt.*                      LGPL
+
+The following files contain some optional GPL code:
+
+    input/cmd_list.c                potentially some commands
+    demux/demux_mkv.c               some verbose message
+    options/options.c               --frames option
+    options/parse_commandline.c     dvd:// expansion
+    player/audio.c                  libaf glue code
+    player/loadfile.c               --frames option (minor but probably fatal)
+    player/osd.c                    OSD level 3
+    player/command.c                add/cycle command, possible sub-add command
+    player/main.c                   configuration output
+
+The following files are partially LGPLv3+ (otherwise LGPL):
+
+    demux/demux_mf.c                minor autodetection thing
+    stream/cache.c                  minor cache option changes
+    video/decode/lavc.h             split from vd_lavc.c
+    video/decode/vd_lavc.c          XvMC influences in get_format()
diff --git a/audio/filter/af.h b/audio/filter/af.h
index 4bd8f55b96..f66b189f14 100644
--- a/audio/filter/af.h
+++ b/audio/filter/af.h
@@ -23,8 +23,8 @@
 #include <sys/types.h>
 
 #include "config.h"
-#if !HAVE_LIBAF
-#error "libaf disabled"
+#if !(HAVE_LIBAF && HAVE_GPL)
+#error "libaf/GPL disabled"
 #endif
 
 #include "options/options.h"
diff --git a/common/av_log.c b/common/av_log.c
index 3f07106b5a..8e5502b317 100644
--- a/common/av_log.c
+++ b/common/av_log.c
@@ -5,20 +5,18 @@
  *
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
- *
- * Almost LGPL.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <stdlib.h>
diff --git a/common/msg.c b/common/msg.c
index 623a509bb4..375eff9aad 100644
--- a/common/msg.c
+++ b/common/msg.c
@@ -1,20 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
- *
- * Almost LGPL.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <stdio.h>
diff --git a/demux/demux_lavf.c b/demux/demux_lavf.c
index e61529fb71..53bf62016a 100644
--- a/demux/demux_lavf.c
+++ b/demux/demux_lavf.c
@@ -3,20 +3,18 @@
  *
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
- *
- * Almost LGPL.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <stdlib.h>
diff --git a/input/cmd_list.c b/input/cmd_list.c
index 6199e7c65f..c8dd77cf7a 100644
--- a/input/cmd_list.c
+++ b/input/cmd_list.c
@@ -225,10 +225,12 @@ const struct mp_cmd_def mp_cmds[] = {
   { MP_CMD_KEYDOWN, "keydown", { ARG_STRING } },
   { MP_CMD_KEYUP, "keyup", { OARG_STRING("") } },
 
+#if HAVE_GPL
   { MP_CMD_AUDIO_ADD, "audio-add", { ARG_STRING,
       OARG_CHOICE(0, ({"select", 0}, {"auto", 1}, {"cached", 2})),
       OARG_STRING(""), OARG_STRING("") } },
   { MP_CMD_AUDIO_REMOVE, "audio-remove", { OARG_INT(-1) } },
+#endif
   { MP_CMD_AUDIO_RELOAD, "audio-reload", { OARG_INT(-1) } },
 
   { MP_CMD_RESCAN_EXTERNAL_FILES, "rescan-external-files", {
diff --git a/options/m_option.c b/options/m_option.c
index 0ec85825b6..00ea5d6d93 100644
--- a/options/m_option.c
+++ b/options/m_option.c
@@ -1,20 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
- *
- * Almost LGPL.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 /// \file
diff --git a/player/audio.c b/player/audio.c
index a26a7d1ff5..d32b8b78d6 100644
--- a/player/audio.c
+++ b/player/audio.c
@@ -965,7 +965,6 @@ static int decode_new_frame(struct ao_chain *ao_c)
     }
 }
 
-#if HAVE_GPL
 /* Try to get at least minsamples decoded+filtered samples in outbuf
  * (total length including possible existing data).
  * Return 0 on success, or negative AD_* error code.
@@ -1064,7 +1063,6 @@ static int filter_audio(struct MPContext *mpctx, struct mp_audio_buffer *outbuf,
 
     return res;
 }
-#endif
 
 void reload_audio_output(struct MPContext *mpctx)
 {
diff --git a/player/command.h b/player/command.h
index c9410423c7..0ab746b1d2 100644
--- a/player/command.h
+++ b/player/command.h
@@ -13,8 +13,6 @@
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
- *
- * Parts under HAVE_GPL are licensed under GNU General Public License.
  */
 
 #ifndef MPLAYER_COMMAND_H
diff --git a/video/decode/dec_video.c b/video/decode/dec_video.c
index 04e428246b..a78203b49a 100644
--- a/video/decode/dec_video.c
+++ b/video/decode/dec_video.c
@@ -1,20 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
- *
- * Almost LGPL.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <stdio.h>
diff --git a/video/decode/dec_video.h b/video/decode/dec_video.h
index 73570f8ed5..d8d47a827c 100644
--- a/video/decode/dec_video.h
+++ b/video/decode/dec_video.h
@@ -1,20 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
- *
- * Almost LGPL.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef MPLAYER_DEC_VIDEO_H
diff --git a/video/decode/vd_lavc.c b/video/decode/vd_lavc.c
index e08246a296..82ab752165 100644
--- a/video/decode/vd_lavc.c
+++ b/video/decode/vd_lavc.c
@@ -1,20 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
- *
- * Almost LGPLv3+.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  *
  * The parts potentially making this file LGPL v3 (instead of v2.1 or later) are:
  * 376e3abf5c7d2 xvmc use get_format for IDCT/MC recognition
@@ -261,16 +259,11 @@ static const struct vd_lavc_hwdec *const hwdec_list[] = {
 #endif
 #if HAVE_VDPAU_HWACCEL
     &mp_vd_lavc_vdpau,
-    &mp_vd_lavc_vdpau_copy,
 #endif
 #if HAVE_VIDEOTOOLBOX_HWACCEL
     &mp_vd_lavc_videotoolbox,
     &mp_vd_lavc_videotoolbox_copy,
 #endif
-#if HAVE_VAAPI_HWACCEL
-    &mp_vd_lavc_vaapi,
-    &mp_vd_lavc_vaapi_copy,
-#endif
 #if HAVE_D3D_HWACCEL
     &mp_vd_lavc_d3d11va,
 
@@ -291,6 +284,13 @@ static const struct vd_lavc_hwdec *const hwdec_list[] = {
  #endif
     &mp_vd_lavc_cuda_copy,
 #endif
+#if HAVE_VDPAU_HWACCEL
+    &mp_vd_lavc_vdpau_copy,
+#endif
+#if HAVE_VAAPI_HWACCEL
+    &mp_vd_lavc_vaapi,
+    &mp_vd_lavc_vaapi_copy,
+#endif
     &mp_vd_lavc_crystalhd,
     NULL
 };
diff --git a/video/filter/vf.c b/video/filter/vf.c
index ae38947262..c2fc4f716a 100644
--- a/video/filter/vf.c
+++ b/video/filter/vf.c
@@ -64,24 +64,25 @@ extern const vf_info_t vf_info_d3d11vpp;
 
 // list of available filters:
 static const vf_info_t *const filter_list[] = {
+#if HAVE_GPL
     &vf_info_crop,
     &vf_info_expand,
     &vf_info_scale,
     &vf_info_format,
     &vf_info_noformat,
     &vf_info_flip,
-
     &vf_info_mirror,
-    &vf_info_lavfi,
-    &vf_info_lavfi_bridge,
     &vf_info_rotate,
     &vf_info_gradfun,
     &vf_info_pullup,
     &vf_info_yadif,
     &vf_info_stereo3d,
-
     &vf_info_dsize,
     &vf_info_sub,
+#endif
+
+    &vf_info_lavfi,
+    &vf_info_lavfi_bridge,
     &vf_info_buffer,
 #if HAVE_VAPOURSYNTH_CORE && HAVE_VAPOURSYNTH
     &vf_info_vapoursynth,
diff --git a/video/mp_image.c b/video/mp_image.c
index aee1f913e6..100149535a 100644
--- a/video/mp_image.c
+++ b/video/mp_image.c
@@ -1,20 +1,18 @@
 /*
  * This file is part of mpv.
  *
- * mpv is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License fo