player/command: change how floating point number are printed

Use "%.7g" to show 7 significant digits. Removes the trailing zeros, and
in general makes it more readable, than fixed 3 decimal digits.

For avsync use "%+.2g" to add plus sign, similar to display-sync
values.

options/m_option.c

@@ -1023,12 +1023,12 @@ static char *print_double(const m_option_t *opt, const void *val)
     return talloc_asprintf(NULL, "%f", f);
 }
 
-static char *print_double_f3(const m_option_t *opt, const void *val)
+static char *print_double_7g(const m_option_t *opt, const void *val)
 {
     double f = VAL(val);
     if (isnan(f))
         return print_double(opt, val);
-    return talloc_asprintf(NULL, "%.3f", f);
+    return talloc_asprintf(NULL, "%.7g", f);
 }
 
 static void add_double(const m_option_t *opt, void *val, double add, bool wrap)
@@ -1100,7 +1100,7 @@ const m_option_type_t m_option_type_double = {
     .size  = sizeof(double),
     .parse = parse_double,
     .print = print_double,
-    .pretty_print = print_double_f3,
+    .pretty_print = print_double_7g,
     .copy  = copy_opt,
     .add = add_double,
     .multiply = multiply_double,
@@ -1126,7 +1126,7 @@ const m_option_type_t m_option_type_aspect = {
     .flags = M_OPT_TYPE_CHOICE | M_OPT_TYPE_USES_RANGE,
     .parse = parse_double_aspect,
     .print = print_double,
-    .pretty_print = print_double_f3,
+    .pretty_print = print_double_7g,
     .copy  = copy_opt,
     .add = add_double,
     .multiply = multiply_double,
@@ -1157,7 +1157,7 @@ static char *print_float(const m_option_t *opt, const void *val)
 static char *print_float_f3(const m_option_t *opt, const void *val)
 {
     double tmp = VAL(val);
-    return print_double_f3(opt, &tmp);
+    return print_double_7g(opt, &tmp);
 }
 
 static void add_float(const m_option_t *opt, void *val, double add, bool wrap)

player/command.c

@@ -419,7 +419,7 @@ static int mp_property_av_speed_correction(void *ctx, struct m_property *prop,
     }
 
     if (action == M_PROPERTY_PRINT) {
-        *(char **)arg = talloc_asprintf(NULL, "%+.05f%%", (val - 1) * 100);
+        *(char **)arg = talloc_asprintf(NULL, "%+.3g%%", (val - 1) * 100);
         return M_PROPERTY_OK;
     }
 
@@ -652,7 +652,11 @@ static int mp_property_avsync(void *ctx, struct m_property *prop,
     if (!mpctx->ao_chain || !mpctx->vo_chain)
         return M_PROPERTY_UNAVAILABLE;
     if (action == M_PROPERTY_PRINT) {
-        *(char **)arg = talloc_asprintf(NULL, "%7.3f", mpctx->last_av_difference);
+        // Don't print small values resulting from calculation inaccuracies
+        if (fabs(mpctx->last_av_difference) < 1e-5)
+            *(char **)arg = talloc_strdup(NULL, "0");
+        else
+            *(char **)arg = talloc_asprintf(NULL, "%+.2g", mpctx->last_av_difference);
         return M_PROPERTY_OK;
     }
     return m_property_double_ro(action, arg, mpctx->last_av_difference);