lavfi: use AVFrame.duration instead of AVFrame.pkt_duration

doc/filters.texi

@@ -11842,7 +11842,7 @@ The current packet's position in the input file or stream
 (in bytes, from the start of the input). A value of -1 indicates
 this info is not available.
 
-@item pkt_duration
+@item duration
 The current packet's duration, in seconds.
 
 @item pkt_size

libavfilter/buffersrc.c

@@ -243,6 +243,13 @@ FF_ENABLE_DEPRECATION_WARNINGS
         }
     }
 
+#if FF_API_PKT_DURATION
+FF_DISABLE_DEPRECATION_WARNINGS
+    if (copy->pkt_duration && copy->pkt_duration != copy->duration)
+        copy->duration = copy->pkt_duration;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+
     ret = ff_filter_frame(ctx->outputs[0], copy);
     if (ret < 0)
         return ret;

libavfilter/f_loop.c

@@ -331,9 +331,16 @@ static int push_frame(AVFilterContext *ctx)
     if (!out)
         return AVERROR(ENOMEM);
     out->pts += s->duration - s->start_pts;
+#if FF_API_PKT_DURATION
+FF_DISABLE_DEPRECATION_WARNINGS
     if (out->pkt_duration)
         duration = out->pkt_duration;
     else
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+    if (out->duration)
+        duration = out->duration;
+    else
         duration = av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
     pts = out->pts + duration;
     ret = ff_filter_frame(outlink, out);
@@ -368,9 +375,16 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
                 return AVERROR(ENOMEM);
             }
             s->nb_frames++;
+#if FF_API_PKT_DURATION
+FF_DISABLE_DEPRECATION_WARNINGS
             if (frame->pkt_duration)
                 duration = frame->pkt_duration;
             else
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+            if (frame->duration)
+                duration = frame->duration;
+            else
                 duration = av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
             s->duration = frame->pts + duration;
             ret = ff_filter_frame(outlink, frame);

libavfilter/vf_deshake_opencl.c

@@ -1413,8 +1413,15 @@ static int filter_frame(AVFilterLink *link, AVFrame *input_frame)
             &debug_matches, 1);
     }
 
+#if FF_API_PKT_DURATION
+FF_DISABLE_DEPRECATION_WARNINGS
     if (input_frame->pkt_duration) {
         duration = input_frame->pkt_duration;
+    } else
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+    if (input_frame->duration) {
+        duration = input_frame->duration;
     } else {
         duration = av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
     }

libavfilter/vf_drawtext.c

@@ -91,8 +91,11 @@ static const char *const var_names[] = {
     "y",
     "pict_type",
     "pkt_pos",
+#if FF_API_PKT_DURATION
     "pkt_duration",
+#endif
     "pkt_size",
+    "duration",
     NULL
 };
 
@@ -131,8 +134,11 @@ enum var_name {
     VAR_Y,
     VAR_PICT_TYPE,
     VAR_PKT_POS,
+#if FF_API_PKT_DURATION
     VAR_PKT_DURATION,
+#endif
     VAR_PKT_SIZE,
+    VAR_DURATION,
     VAR_VARS_NB
 };
 
@@ -1649,8 +1655,18 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 
     s->var_values[VAR_PICT_TYPE] = frame->pict_type;
     s->var_values[VAR_PKT_POS] = frame->pkt_pos;
+#if FF_API_PKT_DURATION
+FF_DISABLE_DEPRECATION_WARNINGS
     s->var_values[VAR_PKT_DURATION] = frame->pkt_duration * av_q2d(inlink->time_base);
+
+    if (frame->pkt_duration)
+        s->var_values[VAR_DURATION] = frame->pkt_duration * av_q2d(inlink->time_base);
+    else
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+    s->var_values[VAR_DURATION] = frame->duration * av_q2d(inlink->time_base);
     s->var_values[VAR_PKT_SIZE] = frame->pkt_size;
+
     s->metadata = frame->metadata;
 
     for (int i = 0; i < loop; i++) {