player: parse and expose m3u playlist titles

Requested. Closes #2100.

DOCS/interface-changes.rst

@@ -20,6 +20,7 @@ Interface changes
 ::
 
  --- mpv 0.10.0 will be released ---
+    - add "playlist/N/title" property
     - add --video-stereo-mode=no to disable auto-conversions
     - add --force-seekable, and change default seekability in some cases
     - add vf yadif/vavpp/vdpaupp interlaced-only suboptions

DOCS/man/input.rst

@@ -1530,6 +1530,11 @@ Property list
         been unloaded yet; in this case, ``current`` refers to the new
         selection. (Since mpv 0.7.0.)
 
+    ``playlist/N/title``
+        Name of the Nth entry. Only available if the playlist file contains
+        such fields, and only if mpv's parser supports it for the given
+        playlist format.
+
     When querying the property with the client API using ``MPV_FORMAT_NODE``,
     or with Lua ``mp.get_property_native``, this will return a mpv_node with
     the following contents:
@@ -1541,6 +1546,7 @@ Property list
                 "filename"  MPV_FORMAT_STRING
                 "current"   MPV_FORMAT_FLAG (might be missing; since mpv 0.7.0)
                 "playing"   MPV_FORMAT_FLAG (same)
+                "title"     MPV_FORMAT_STRING (optional)
 
 ``track-list``
     List of audio/video/sub tracks, current entry marked. Currently, the raw

common/playlist.h

@@ -34,6 +34,8 @@ struct playlist_entry {
     struct playlist_param *params;
     int num_params;
 
+    char *title;
+
     // Set to true if playback didn't seem to work, or if the file could be
     // played only for a very short time. This is used to make playlist
     // navigation just work in case the user has unplayable files in the

demux/demux_playlist.c

@@ -112,11 +112,25 @@ static int parse_m3u(struct pl_parser *p)
 ok:
     if (p->probing)
         return 0;
+    char *title = NULL;
     while (line.len || !pl_eof(p)) {
-        if (line.len > 0 && !bstr_startswith0(line, "#"))
-            pl_add(p, line);
+        if (bstr_eatstart0(&line, "#EXTINF:")) {
+            bstr duration, btitle;
+            if (bstr_split_tok(line, ",", &duration, &btitle) && btitle.len) {
+                talloc_free(title);
+                title = bstrto0(NULL, btitle);
+            }
+        } else if (line.len > 0 && !bstr_startswith0(line, "#")) {
+            char *fn = bstrto0(NULL, line);
+            struct playlist_entry *e = playlist_entry_new(fn);
+            talloc_free(fn);
+            e->title = talloc_steal(e, title);
+            title = NULL;
+            playlist_add(p->pl, e);
+        }
         line = bstr_strip(pl_get_line(p));
     }
+    talloc_free(title);
     return 0;
 }
 

player/command.c

@@ -363,8 +363,6 @@ static int mp_property_media_title(void *ctx, struct m_property *prop,
         name = mpctx->opts->media_title;
     if (name && name[0])
         return m_property_strdup_ro(action, arg, name);
-    if (name && name[0])
-        return m_property_strdup_ro(action, arg, name);
     if (mpctx->master_demuxer) {
         name = mp_tags_get_str(mpctx->master_demuxer->metadata, "title");
         if (name && name[0])
@@ -373,6 +371,8 @@ static int mp_property_media_title(void *ctx, struct m_property *prop,
         if (name && name[0])
             return m_property_strdup_ro(action, arg, name);
     }
+    if (mpctx->playing && mpctx->playing->title)
+        return m_property_strdup_ro(action, arg, mpctx->playing->title);
     return mp_property_filename(ctx, prop, action, arg);
 }
 
@@ -2923,6 +2923,7 @@ static int get_playlist_entry(int item, int action, void *arg, void *ctx)
         {"filename",    SUB_PROP_STR(e->filename)},
         {"current",     SUB_PROP_FLAG(1), .unavailable = !current},
         {"playing",     SUB_PROP_FLAG(1), .unavailable = !playing},
+        {"title",       SUB_PROP_STR(e->title), .unavailable = !e->title},
         {0}
     };