demux_mf, stream_mf: change license to LGPL

cehoyos, who did not agree to the relicensing, added bcb5c78. If
there was copyright, we consider it gone, because the table changed. It
does not map file extension to a FourCC anymore, and codecs.conf is
gone. The new mapping is a libavcodec codec name (happens to be the same
as the file extension).

The same applies to commits 60ecafe, b749836, 5b3e3be. None of these
authors were contacted. These were before the code was replaced with a
table (in d032680). The parts outside of demux_mf.c were removed a long
time ago. Like in the previous comment, we don't think any copyright
applies at least to the new code (at least after the FourCC removal).

iive authored 0aa37a0, which is probably still left in some form, and
makes demux_mf.c "LGPL 3 or later".

stream_avdevice.c (unrelated) has been marked as LGPL before.

Copyright

@@ -141,7 +141,7 @@ x   audio/audio.*                   very hard (mp_audio based of anders' af_audi
     demux/demux_edl.c               LGPL
     demux/demux_lavf.c              almost LGPL
     demux/demux_libarchive.c        LGPL
-    demux/demux_mf.c                hard
+    demux/demux_mf.c                LGPLv3+
     demux/demux_mkv.c               LGPL (mostly)
     demux/demux_mkv_timeline.c      LGPL
     demux/demux_null.c              LGPL
@@ -244,7 +244,7 @@ x   player/audio.c                  LGPL (dysfunctional due to libaf)
     stream/dvb*                     must stay GPL
     stream/frequencies.*            must stay GPL
     stream/rar.*                    LGPL
-    stream/stream_avdevice.c        unknown
+    stream/stream_avdevice.c        LGPL
     stream/stream_bluray.c          unknown
     stream/stream.*                 LGPL
     stream/stream_cb.c              LGPL
@@ -258,7 +258,7 @@ x   player/audio.c                  LGPL (dysfunctional due to libaf)
     stream/stream_lavf.c            LGPL
     stream/stream_libarchive.*      LGPL
     stream/stream_memory.c          LGPL
-    stream/stream_mf.c              unknown
+    stream/stream_mf.c              LGPL
     stream/stream_null.c            LGPL
     stream/stream_rar.c             LGPL
     stream/stream_smb.c             will stay GPLv3

demux/demux_mf.c

@@ -1,18 +1,24 @@
 /*
  * 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/>.
+ * 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 making this file LGPL v3 (instead of v2.1 or later) are:
+ *  0aa37a0db23c allow autodetection of pictures type when using mf://@fil...
+ * (iive agreed to LGPL v3+ only.)
+ * Once these changes are not relevant to for copyright anymore (e.g. because
+ * they have been removed), this file will change to LGPLv2.1+.
  */
 
 #include <stdio.h>

stream/stream_mf.c

@@ -6,18 +6,18 @@
  *
  * 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/>.
+ * 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 "config.h"