options: change --vid, --aid, --sid options

The --vid, --aid, --sid options now accept the values 'off' and 'auto',
instead of having the user deal with the numeric values -2 and -1. The
numeric values are not allowed anymore.

Remove the --audio option. It was probably meant as compensation option
for --no-audio. There are no such options for sub/video, and it was not
documented, so just remove it. The replacement is "--aid=auto".

Also do some updates to the manpage.

DOCS/man/en/options.rst

@@ -87,12 +87,9 @@
     :``--afm=ffmpeg``:    Try FFmpeg's libavcodec codecs first.
     :``--afm=acm,dshow``: Try Win32 codecs first.
 
---aid=<ID>
-    Select audio channel (MPEG: 0-31, AVI/OGM: 1-99, ASF/RM: 0-127, VOB(AC-3):
-    128-159, VOB(LPCM): 160-191, MPEG-TS 17-8190). MPlayer prints the
-    available audio IDs when run in verbose (-v) mode. When playing an MPEG-TS
-    stream, MPlayer will use the first program (if present) with the chosen
-    audio stream. See also ``--alang``.
+--aid=<ID|auto|off>
+    Select audio channel. ``auto`` selects the default, ``off`` disables audio.
+    See also ``--alang``.
 
 --alang=<languagecode[,languagecode,...]>
     Specify a priority list of audio languages to use. Different container
@@ -1271,17 +1268,15 @@
     Do not use index present in the file even if one is present.
 
 --no-audio
-    Do not play sound. Useful for benchmarking.
+    Do not play sound. With some demuxers this may not work. In those cases
+    you can try ``--ao=null`` instead.
 
 --no-sub
-    Disables any otherwise auto-selected internal subtitles (as e.g. the
-    Matroska/mkv demuxer supports). Use ``--no-autosub`` to disable the
-    loading of external subtitle files.
+    Disables display of internal and external subtitles.
 
 --no-video
     Do not play video. With some demuxers this may not work. In those cases
-    you can try ``--vc=null --vo=null`` instead; but ``--vc=null`` is always
-    unreliable.
+    you can try ``--vo=null`` instead.
 
 --ontop
     Makes the player window stay on top of other windows. Supported by video
@@ -1699,10 +1694,9 @@
 --shuffle
     Play files in random order.
 
---sid=<ID>
-    Display the subtitle stream specified by <ID> (0-31). MPlayer prints the
-    available subtitle IDs when run in verbose (``-v``) mode. If you cannot
-    select one of the subtitles on a DVD, try ``--vobsubid``.
+--sid=<ID|auto|off>
+    Display the subtitle stream specified by <ID> (0-31). ``auto`` selects the
+    default, ``off`` disables subtitles.
     See also ``--slang``, ``--vobsubid``, ``--no-sub``.
 
 --slang=<languagecode[,languagecode,...]>
@@ -2262,10 +2256,8 @@
     :``--vfm=xanim``:
         Try XAnim codecs first.
 
---vid=<ID>
-    Select video channel (MPG: 0-15, ASF: 0-255, MPEG-TS: 17-8190). When
-    playing an MPEG-TS stream, MPlayer will use the first program (if present)
-    with the chosen video stream.
+--vid=<ID|auto|off>
+    Select video channel. ``auto`` selects the default, ``off`` disables video.
 
 --vm
     Try to change to a different video mode. Supported by the x11 and xv video

cfg-mplayer.h

@@ -397,12 +397,11 @@ const m_option_t common_opts[] = {
     {"loadidx", &index_file_load, CONF_TYPE_STRING, 0, 0, 0, NULL},
 
     // select audio/video/subtitle stream
-    OPT_INTRANGE("aid", audio_id, 0, -2, 8190),
-    OPT_INTRANGE("vid", video_id, 0, -2, 8190),
-    OPT_INTRANGE("sid", sub_id, 0, -2, 8190),
+    OPT_TRACKCHOICE("aid", audio_id),
+    OPT_TRACKCHOICE("vid", video_id),
+    OPT_TRACKCHOICE("sid", sub_id),
     OPT_FLAG_CONSTANTS("no-sub", sub_id, 0, -1, -2),
     OPT_FLAG_CONSTANTS("no-video", video_id, 0, -1, -2),
-    OPT_FLAG_CONSTANTS("audio", audio_id, 0, -2, -1),
     OPT_FLAG_CONSTANTS("no-audio", audio_id, 0, -1, -2),
     OPT_STRINGLIST("alang", audio_lang, 0),
     OPT_STRINGLIST("slang", sub_lang, 0),

m_option.h

@@ -471,6 +471,8 @@ static inline void m_option_free(const m_option_t *opt, void *dst)
 #define OPT_CHOICE_OR_INT_(optname, varname, flags, minval, maxval, choices, ...) OPT_GENERAL(optname, varname, (flags) | CONF_RANGE, .min = minval, .max = maxval, .priv = (void *)&(const struct m_opt_choice_alternatives[]){OPT_HELPER_REMOVEPAREN choices, {NULL}}, __VA_ARGS__)
 #define OPT_TIME(...) OPT_GENERAL(__VA_ARGS__, .type = &m_option_type_time)
 
+#define OPT_TRACKCHOICE(name, var) OPT_CHOICE_OR_INT(name, var, 0, 0, 8190, ({"off", -2}, {"no", -2}, {"auto", -1}))
+
 // subconf must have the type struct m_sub_options.
 // flagv should be M_OPT_MERGE or M_OPT_FLATTEN.
 // varname refers to the field, that must be a pointer to a field described by