+/**
+ * Add this frame's source path and basename to packet's sidedata
+ * as a dictionary, so it can be used by filters like 'drawtext'.
+ */
+static int add_filename_as_pkt_side_data(char *filename, AVPacket *pkt) {
+ AVDictionary *d = NULL;
+ char *packed_metadata = NULL;
+ size_t metadata_len;
+ int ret;
+
+ av_dict_set(&d, "lavf.image2dec.source_path", filename, 0);
+ av_dict_set(&d, "lavf.image2dec.source_basename", av_basename(filename), 0);
+
+ packed_metadata = av_packet_pack_dictionary(d, &metadata_len);
+ av_dict_free(&d);
+ if (!packed_metadata)
+ return AVERROR(ENOMEM);
+ ret = av_packet_add_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
+ packed_metadata, metadata_len);
+ if (ret < 0) {
+ av_freep(&packed_metadata);
+ return ret;
+ }
+ return 0;
+}
+