[FFmpeg-cvslog] avfilter/vf_tpad: fix check for drawing initialization

[Marvin Scholz]

ffmpeg | branch: release/6.1 | Marvin Scholz <epirat07 at gmail.com> | Tue Nov  7 23:21:17 2023 +0100| [c5ee01d966ab43338f913c3977bbb638f8940122] | committer: Anton Khirnov

avfilter/vf_tpad: fix check for drawing initialization

The check if drawing needs to be initialized and supported formats
should be drawable ones was flawed, as pad_stop/pad_start is only
populated from stop_duration/start_duration after these checks.

To fix that, check the _duration variants as well and for better
readability and maintainability break the check out into its own
helper.

Fixes a regression from 86b252ea9dee18006910e30646ad1067f2d1323f
Fix #10621

Signed-off-by: Anton Khirnov <anton at khirnov.net>
(cherry picked from commit 6667741029bce9a79b48caedf24d6cb69c5ead7d)
Signed-off-by: Anton Khirnov <anton at khirnov.net>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c5ee01d966ab43338f913c3977bbb638f8940122
---

 libavfilter/vf_tpad.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/libavfilter/vf_tpad.c b/libavfilter/vf_tpad.c
index 7990403e81..1efe4ec479 100644
--- a/libavfilter/vf_tpad.c
+++ b/libavfilter/vf_tpad.c
@@ -70,11 +70,17 @@ static const AVOption tpad_options[] = {
 
 AVFILTER_DEFINE_CLASS(tpad);
 
+static int needs_drawing(const TPadContext *s) {
+    return (
+        (s->stop_mode  == MODE_ADD && (s->pad_stop  != 0 || s->stop_duration  != 0)) ||
+        (s->start_mode == MODE_ADD && (s->pad_start != 0 || s->start_duration != 0))
+    );
+}
+
 static int query_formats(AVFilterContext *ctx)
 {
     TPadContext *s = ctx->priv;
-    if ((s->stop_mode == MODE_ADD && s->pad_stop != 0) ||
-        (s->start_mode == MODE_ADD && s->pad_start != 0))
+    if (needs_drawing(s))
         return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
 
     return ff_set_common_formats(ctx, ff_all_formats(AVMEDIA_TYPE_VIDEO));
@@ -196,8 +202,7 @@ static int config_input(AVFilterLink *inlink)
     AVFilterContext *ctx = inlink->dst;
     TPadContext *s = ctx->priv;
 
-    if ((s->stop_mode == MODE_ADD && s->pad_stop != 0) ||
-        (s->start_mode == MODE_ADD && s->pad_start != 0)) {
+    if (needs_drawing(s)) {
         ff_draw_init(&s->draw, inlink->format, 0);
         ff_draw_color(&s->draw, &s->color, s->rgba_color);
     }