avfilter/buffersrc: add a side_data field

This will be used to propagate global side data through the filterchain.

Signed-off-by: James Almer <jamrial@gmail.com>

doc/APIchanges

@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2024-03-07
 
 API changes, most recent first:
 
+2025-01-25 - xxxxxxxxxx - lavfi 10.8.100 - buffersrc.h
+  Add AVBufferSrcParameters.side_data and AVBufferSrcParameters.nb_side_data
+
 2025-01-25 - xxxxxxxxxx - lavfi 10.7.100 - avfilter.h
   Add AVFilterLink.side_data and AVFilterLink.nb_side_data
 

libavfilter/buffersrc.c

@@ -61,6 +61,8 @@ typedef struct BufferSourceContext {
     enum AVSampleFormat sample_fmt;
     int channels;
     AVChannelLayout ch_layout;
+    AVFrameSideData **side_data;
+    int nb_side_data;
 
     int eof;
     int64_t last_pts;
@@ -160,6 +162,17 @@ int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *par
         return AVERROR_BUG;
     }
 
+    if (param->nb_side_data > 0)
+        av_frame_side_data_free(&s->side_data, &s->nb_side_data);
+    for (int i = 0; i < param->nb_side_data; i++) {
+        int ret = av_frame_side_data_clone(&s->side_data, &s->nb_side_data,
+                                           param->side_data[i], 0);
+        if (ret < 0) {
+            av_frame_side_data_free(&s->side_data, &s->nb_side_data);
+            return ret;
+        }
+    }
+
     return 0;
 }
 
@@ -432,6 +445,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     BufferSourceContext *s = ctx->priv;
     av_buffer_unref(&s->hw_frames_ctx);
     av_channel_layout_uninit(&s->ch_layout);
+    av_frame_side_data_free(&s->side_data, &s->nb_side_data);
 }
 
 static int query_formats(const AVFilterContext *ctx,
@@ -523,6 +537,18 @@ static int config_props(AVFilterLink *link)
         return AVERROR(EINVAL);
     }
 
+    for (int i = 0; i < c->nb_side_data; i++) {
+        const AVSideDataDescriptor *desc = av_frame_side_data_desc(c->side_data[i]->type);
+        int ret;
+
+        ret = av_frame_side_data_clone(&link->side_data, &link->nb_side_data,
+                                       c->side_data[i], 0);
+        if (ret < 0) {
+            av_frame_side_data_free(&link->side_data, &link->nb_side_data);
+            return ret;
+        }
+    }
+
     link->time_base = c->time_base;
     l->frame_rate = c->frame_rate;
     return 0;

libavfilter/buffersrc.h

@@ -120,6 +120,9 @@ typedef struct AVBufferSrcParameters {
      */
     enum AVColorSpace color_space;
     enum AVColorRange color_range;
+
+    AVFrameSideData **side_data;
+    int nb_side_data;
 } AVBufferSrcParameters;
 
 /**

libavfilter/version.h

@@ -31,7 +31,7 @@
 
 #include "version_major.h"
 
-#define LIBAVFILTER_VERSION_MINOR   7
+#define LIBAVFILTER_VERSION_MINOR   8
 #define LIBAVFILTER_VERSION_MICRO 100