commands: add show_tracks_osd command to display audio and subtitle tracks on OSD

The command lists the audio and subtitle tracks in the current file on the
OSD. It also marks the currently active streams.
Video streams are not shown, as files with more than one video stream are
exceedingly rare.

1 files changed, 1 insertions, 0 deletions

diff --git a/input/input.h b/input/input.h
index 9bbf6bf7df..977901b6d3 100644
--- a/input/input.h
+++ b/input/input.h
@@ -155,6 +155,7 @@ enum mp_command_type {
     MP_CMD_AF_CMDLINE,
 
     MP_CMD_SHOW_CHAPTERS,
+    MP_CMD_SHOW_TRACKS,
 };
 
 // The arg types