command: implement A-B loops

Probably needs to be polished a bit more. Also, might require a key
binding that can set/clear the loop points in a more intuitive way.

For now, something like this can be put into input.conf to use it:

ctrl+y set ab-loop-a ${time-pos}    # set A
ctrl+x set ab-loop-b ${time-pos}    # set B
ctrl+c set ab-loop-a no             # clear (mostly)

Fixes #1241.

1 files changed, 1 insertions, 0 deletions

diff --git a/options/options.h b/options/options.h
index 9284320f40..63f77b2b3a 100644
--- a/options/options.h
+++ b/options/options.h
@@ -158,6 +158,7 @@ typedef struct MPOpts {
     struct m_rel_time play_end;
     struct m_rel_time play_length;
     int play_frames;
+    double ab_loop[2];
     double step_sec;
     int position_resume;
     int position_save_on_quit;