player: make the time display relative to start PTS

This commit makes the playback start time always at time 0.

Signed-off-by: wm4 <wm4@nowhere>

DOCS/man/input.rst

@@ -658,6 +658,9 @@ Property list
 ``playtime-remaining``
     ``time-remaining`` scaled by the the current ``speed``.
 
+``playback-time``
+    Return the playback time, which is the time difference between start PTS and current PTS.
+
 ``chapter`` (RW)
     Current chapter number. The number of the first chapter is 0.
 

player/command.c

@@ -462,10 +462,9 @@ static int mp_property_time_pos(void *ctx, struct m_property *prop,
 static bool time_remaining(MPContext *mpctx, double *remaining)
 {
     double len = get_time_length(mpctx);
-    double pos = get_current_time(mpctx);
-    double start = get_start_time(mpctx);
+    double playback = get_playback_time(mpctx);
 
-    *remaining = len - (pos - start);
+    *remaining = len - playback;
 
     return len > 0;
 }
@@ -492,6 +491,16 @@ static int mp_property_playtime_remaining(void *ctx, struct m_property *prop,
     return property_time(action, arg, remaining / speed);
 }
 
+static int mp_property_playback_time(void *ctx, struct m_property *prop,
+                                     int action, void *arg)
+{
+    MPContext *mpctx = ctx;
+    if (!mpctx->num_sources)
+        return M_PROPERTY_UNAVAILABLE;
+
+    return property_time(action, arg, get_playback_time(mpctx));
+}
+
 /// Current BD/DVD title (RW)
 static int mp_property_disc_title(void *ctx, struct m_property *prop,
                                   int action, void *arg)
@@ -2594,6 +2603,7 @@ static const struct m_property mp_properties[] = {
     {"time-pos", mp_property_time_pos},
     {"time-remaining", mp_property_remaining},
     {"playtime-remaining", mp_property_playtime_remaining},
+    {"playback-time", mp_property_playback_time},
     {"disc-title", mp_property_disc_title},
     {"disc-menu-active", mp_property_disc_menu},
     {"chapter", mp_property_chapter},

player/core.h

@@ -439,6 +439,7 @@ void queue_seek(struct MPContext *mpctx, enum seek_type type, double amount,
 bool mp_seek_chapter(struct MPContext *mpctx, int chapter);
 double get_time_length(struct MPContext *mpctx);
 double get_current_time(struct MPContext *mpctx);
+double get_playback_time(struct MPContext *mpctx);
 int get_percent_pos(struct MPContext *mpctx);
 double get_current_pos_ratio(struct MPContext *mpctx, bool use_range);
 int get_current_chapter(struct MPContext *mpctx);

player/lua/osc.lua

@@ -906,9 +906,9 @@ function osc_init()
 
     local contentF = function (ass)
         if state.tc_ms then
-            ass:append(mp.get_property_osd("time-pos/full"))
+            ass:append(mp.get_property_osd("playback-time/full"))
         else
-            ass:append(mp.get_property_osd("time-pos"))
+            ass:append(mp.get_property_osd("playback-time"))
         end
     end
 

player/osd.c

@@ -181,8 +181,7 @@ void print_status(struct MPContext *mpctx)
     saddf(&line, ": ");
 
     // Playback position
-    double cur = get_current_time(mpctx);
-    sadd_hhmmssff(&line, cur, mpctx->opts->osd_fractions);
+    sadd_hhmmssff(&line, get_playback_time(mpctx), mpctx->opts->osd_fractions);
 
     double len = get_time_length(mpctx);
     if (len >= 0) {
@@ -437,7 +436,7 @@ static void sadd_osd_status(char **buffer, struct MPContext *mpctx, bool full)
         *buffer = talloc_strdup_append(*buffer, text);
         talloc_free(text);
     } else {
-        sadd_hhmmssff(buffer, get_current_time(mpctx), fractions);
+        sadd_hhmmssff(buffer, get_playback_time(mpctx), fractions);
         if (full) {
             saddf(buffer, " / ");
             sadd_hhmmssff(buffer, get_time_length(mpctx), fractions);

player/playloop.c

@@ -426,6 +426,13 @@ double get_current_time(struct MPContext *mpctx)
     return 0;
 }
 
+double get_playback_time(struct MPContext *mpctx)
+{
+    double cur = get_current_time(mpctx);
+    double start = get_start_time(mpctx);
+    return cur >= start ? cur - start : cur;
+}
+
 // Return playback position in 0.0-1.0 ratio, or -1 if unknown.
 double get_current_pos_ratio(struct MPContext *mpctx, bool use_range)
 {

player/screenshot.c

@@ -199,7 +199,7 @@ static char *create_fname(struct MPContext *mpctx, char *template,
         }
         case 'p':
         case 'P': {
-            char *t = mp_format_time(get_current_time(mpctx), fmt == 'P');
+            char *t = mp_format_time(get_playback_time(mpctx), fmt == 'P');
             append_filename(&res, t);
             talloc_free(t);
             break;
@@ -210,7 +210,7 @@ static char *create_fname(struct MPContext *mpctx, char *template,
                 goto error_exit;
             template++;
             char fmtstr[] = {'%', tfmt, '\0'};
-            char *s = mp_format_time_fmt(fmtstr, get_current_time(mpctx));
+            char *s = mp_format_time_fmt(fmtstr, get_playback_time(mpctx));
             if (!s)
                 goto error_exit;
             append_filename(&res, s);