[FFmpeg-devel] [PATCH v2 2/4] avfilter/filters: keep track of AVFilterPad labels

[Niklas Haas <ffmpeg@haasn.xyz>]

From: Niklas Haas <git@haasn.dev>

For use in diagnostic code e.g. avfilter_graph_dump().
---
 libavfilter/avfilter.c    | 2 ++
 libavfilter/filters.h     | 6 ++++++
 libavfilter/graphparser.c | 6 ++++++
 3 files changed, 14 insertions(+)

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index e732556ffa..b434724694 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -825,11 +825,13 @@ void avfilter_free(AVFilterContext *filter)
 
     for (i = 0; i < filter->nb_inputs; i++) {
         free_link(filter->inputs[i]);
+        av_freep(&filter->input_pads[i].label);
         if (filter->input_pads[i].flags  & AVFILTERPAD_FLAG_FREE_NAME)
             av_freep(&filter->input_pads[i].name);
     }
     for (i = 0; i < filter->nb_outputs; i++) {
         free_link(filter->outputs[i]);
+        av_freep(&filter->output_pads[i].label);
         if (filter->output_pads[i].flags & AVFILTERPAD_FLAG_FREE_NAME)
             av_freep(&filter->output_pads[i].name);
     }
diff --git a/libavfilter/filters.h b/libavfilter/filters.h
index 654aed5c9e..751a125f52 100644
--- a/libavfilter/filters.h
+++ b/libavfilter/filters.h
@@ -43,6 +43,12 @@ struct AVFilterPad {
      */
     const char *name;
 
+    /**
+     * Parsed label for this filter pad in the filter graph, or NULL if
+     * anonymous or unknown.
+     */
+    const char *label;
+
     /**
      * AVFilterPad type.
      */
diff --git a/libavfilter/graphparser.c b/libavfilter/graphparser.c
index a23e26d2e3..9f8dd3190a 100644
--- a/libavfilter/graphparser.c
+++ b/libavfilter/graphparser.c
@@ -564,6 +564,12 @@ int avfilter_graph_segment_create_filters(AVFilterGraphSegment *seg, int flags)
                 }
             }
 
+            /* Set all filter pad labels to their corresponding parsed labels */
+            for (size_t i = 0; i < FFMIN(p->nb_inputs, p->filter->nb_inputs); i++)
+                p->filter->input_pads[i].label = av_strdup(p->inputs[i]->label);
+            for (size_t i = 0; i < FFMIN(p->nb_outputs, p->filter->nb_outputs); i++)
+                p->filter->output_pads[i].label = av_strdup(p->outputs[i]->label);
+
             av_freep(&p->filter_name);
             av_freep(&p->instance_name);
 
-- 
2.47.0

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