sub: minor refactor how video FPS for MicroDVD is set

So that the video FPs is not required at initialization, and can be set
later.

(As for whether this MicroDVD crap is worth the trouble to handle it
"correctly": MicroDVD files are unfortunately still around, and in at
least one case using the video FPS seemed to help indeed.)

1 files changed, 25 insertions, 13 deletions

diff --git a/sub/sd_ass.c b/sub/sd_ass.c
index 869d8eaf1f..d798b1f4f4 100644
--- a/sub/sd_ass.c
+++ b/sub/sd_ass.c
@@ -48,7 +48,7 @@ struct sd_ass_priv {
     char last_text[500];
     struct mp_image_params video_params;
     struct mp_image_params last_params;
-    double sub_speed;
+    double sub_speed, video_fps, frame_fps;
     int64_t *seen_packets;
     int num_seen_packets;
 };
@@ -147,6 +147,24 @@ static void enable_output(struct sd *sd, bool enable)
     }
 }
 
+static void update_subtitle_speed(struct sd *sd)
+{
+    struct MPOpts *opts = sd->opts;
+    struct sd_ass_priv *ctx = sd->priv;
+    ctx->sub_speed = 1.0;
+
+    if (ctx->video_fps > 0 && ctx->frame_fps > 0) {
+        MP_VERBOSE(sd, "Frame based format, dummy FPS: %f, video FPS: %f\n",
+                   ctx->frame_fps, ctx->video_fps);
+        ctx->sub_speed *= ctx->frame_fps / ctx->video_fps;
+    }
+
+    if (opts->sub_fps && ctx->video_fps)
+        ctx->sub_speed *= opts->sub_fps / ctx->video_fps;
+
+    ctx->sub_speed *= opts->sub_speed;
+}
+
 static int init(struct sd *sd)
 {
     struct MPOpts *opts = sd->opts;
@@ -187,18 +205,8 @@ static int init(struct sd *sd)
 
     mp_ass_add_default_styles(ctx->ass_track, opts);
 
-    ctx->sub_speed = 1.0;
-
-    if (sd->video_fps && sd->sh && sd->sh->sub->frame_based > 0) {
-        MP_VERBOSE(sd, "Frame based format, dummy FPS: %f, video FPS: %f\n",
-                   sd->sh->sub->frame_based, sd->video_fps);
-        ctx->sub_speed *= sd->sh->sub->frame_based / sd->video_fps;
-    }
-
-    if (opts->sub_fps && sd->video_fps)
-        ctx->sub_speed *= opts->sub_fps / sd->video_fps;
-
-    ctx->sub_speed *= opts->sub_speed;
+    ctx->frame_fps = sd->sh->sub->frame_based;
+    update_subtitle_speed(sd);
 
     enable_output(sd, true);
 
@@ -613,6 +621,10 @@ static int control(struct sd *sd, enum sd_ctrl cmd, void *arg)
     case SD_CTRL_SET_TOP:
         ctx->on_top = *(bool *)arg;
         return CONTROL_OK;
+    case SD_CTRL_SET_VIDEO_DEF_FPS:
+        ctx->video_fps = *(double *)arg;
+        update_subtitle_speed(sd);
+        return CONTROL_OK;
     default:
         return CONTROL_UNKNOWN;
     }