player: don't decrement --ab-loop-count=N and add remaining-ab-loops

Follow up to the previous commit. Stop decreasing --ab-loop-count=N on
each iteration so it is preserved across different loops. In particular
it is preserved between different files without adding it to
--reset-on-next-file. Add a property to expose the remaning A-B loop
count instead.

The current behavior of --ab-loop-count=N is even worse than --loop-file
since it also doesn't reset when defining a new A-B loop in the same
file. Defining it has no effect after --ab-loop-count has decreased to
0, and this can't be fixed by adding it to --reset-on-next-file. This
commit also resets remaining-ab-loops every time --ab-loop-a and
--ab-loop-b are set to fix this.

DOCS/interface-changes/loop.txt

@@ -1,2 +1,4 @@
 numerical values of `--loop-file` no longer decrease on each iteration
 add `remaining-file-loops` property as a replacement to get the remaining loop count
+numerical values of `--ab-loop-count` no longer decrease on each iteration
+add `remaining-ab-loops` property as a replacement to get the remaining loop count

DOCS/man/input.rst

@@ -2148,6 +2148,12 @@ Property list
     times it causes the player to seek to the beginning of the file, so it is 0
     the last the time is played. -1 corresponds to infinity.
 
+``remaining-ab-loops``
+    How many more times the current A-B loop is going to be looped, if one is
+    active. This is initialized from the value of ``--ab-loop-count``. This
+    counts the number of times it causes the player to seek to ``--ab-loop-a``,
+    so it is 0 the last the time the loop is played. -1 corresponds to infinity.
+
 ``chapter`` (RW)
     Current chapter number. The number of the first chapter is 0.
 

DOCS/man/options.rst

@@ -441,11 +441,10 @@ Playback Control
 
 ``--ab-loop-count=<N|inf>``
     Run A-B loops only N times, then ignore the A-B loop points (default: inf).
-    Every finished loop iteration will decrement this option by 1 (unless it is
-    set to ``inf`` or 0). ``inf`` means that looping goes on forever. If this
-    option is set to 0, A-B looping is ignored, and even the ``ab-loop`` command
-    will not enable looping again (the command will show ``(disabled)`` on the
-    OSD message if both loop points are set, but ``ab-loop-count`` is 0).
+    ``inf`` means that looping goes on forever. If this option is set to 0, A-B
+    looping is ignored, and even the ``ab-loop`` command will not enable looping
+    again (the command will show ``(disabled)`` on the OSD message if both loop
+    points are set, but ``ab-loop-count`` is 0).
 
 ``--ordered-chapters=<yes|no>``
     Enable support for Matroska ordered chapters. mpv will load and

player/command.c

@@ -876,6 +876,13 @@ static int mp_property_remaining_file_loops(void *ctx, struct m_property *prop,
     return m_property_int_ro(action, arg, mpctx->remaining_file_loops);
 }
 
+static int mp_property_remaining_ab_loops(void *ctx, struct m_property *prop,
+        int action, void *arg)
+{
+    MPContext *mpctx = ctx;
+    return m_property_int_ro(action, arg, mpctx->remaining_ab_loops);
+}
+
 /// Current chapter (RW)
 static int mp_property_chapter(void *ctx, struct m_property *prop,
                                int action, void *arg)
@@ -4007,6 +4014,8 @@ static const struct m_property mp_properties_base[] = {
     {"playtime-remaining", mp_property_playtime_remaining},
     M_PROPERTY_ALIAS("playback-time", "time-pos"),
     {"remaining-file-loops", mp_property_remaining_file_loops},
+    {"remaining-ab-loops", mp_property_remaining_ab_loops},
+    {"chapter", mp_property_chapter},
     {"edition", mp_property_edition},
     {"current-edition", mp_property_current_edition},
     {"chapters", mp_property_chapters},
@@ -7496,6 +7505,12 @@ void mp_option_change_callback(void *ctx, struct m_config_option *co, int flags,
         mp_notify_property(mpctx, "remaining-file-loops");
     }
 
+    if (opt_ptr == &opts->ab_loop[0] || opt_ptr == &opts->ab_loop[1] ||
+        opt_ptr == &opts->ab_loop_count) {
+        mpctx->remaining_ab_loops = opts->ab_loop_count;
+        mp_notify_property(mpctx, "remaining-ab-loops");
+    }
+
     if (opt_ptr == &opts->ab_loop[0] || opt_ptr == &opts->ab_loop[1]) {
         update_ab_loop_clip(mpctx);
         // Update if visible

player/core.h

@@ -422,6 +422,7 @@ typedef struct MPContext {
     bool playing_msg_shown;
 
     int remaining_file_loops;
+    int remaining_ab_loops;
 
     bool paused_for_cache;
     bool demux_underrun;

player/loadfile.c

@@ -1635,6 +1635,8 @@ static void play_current_file(struct MPContext *mpctx)
 
     mpctx->remaining_file_loops = mpctx->opts->loop_file;
     mp_notify_property(mpctx, "remaining-file-loops");
+    mpctx->remaining_ab_loops = mpctx->opts->ab_loop_count;
+    mp_notify_property(mpctx, "remaining-ab-loops");
 
     mpctx->max_frames = opts->play_frames;
 

player/misc.c

@@ -129,7 +129,7 @@ bool get_ab_loop_times(struct MPContext *mpctx, double t[2])
     t[0] = opts->ab_loop[0];
     t[1] = opts->ab_loop[1];
 
-    if (!opts->ab_loop_count)
+    if (!mpctx->remaining_ab_loops)
         return false;
 
     if (t[0] == MP_NOPTS_VALUE || t[1] == MP_NOPTS_VALUE || t[0] == t[1])

player/playloop.c

@@ -885,8 +885,6 @@ static void handle_sstep(struct MPContext *mpctx)
 
 static void handle_loop_file(struct MPContext *mpctx)
 {
-    struct MPOpts *opts = mpctx->opts;
-
     if (mpctx->stop_play != AT_END_OF_FILE)
         return;
 
@@ -895,9 +893,9 @@ static void handle_loop_file(struct MPContext *mpctx)
 
     double ab[2];
     if (get_ab_loop_times(mpctx, ab) && mpctx->ab_loop_clip) {
-        if (opts->ab_loop_count > 0) {
-            opts->ab_loop_count--;
-            m_config_notify_change_opt_ptr(mpctx->mconfig, &opts->ab_loop_count);
+        if (mpctx->remaining_ab_loops > 0) {
+            mpctx->remaining_ab_loops--;
+            mp_notify_property(mpctx, "remaining-ab-loops");
         }
         target = ab[0];
         prec = MPSEEK_EXACT;