+/**
+ * @brief parse gxf timecode and add it to metadata
+ */
+static int add_timecode_metadata(AVDictionary **pm, const char *key, uint32_t timecode, int fields_per_frame)
+{
+ char tmp[128];
+ int field = timecode & 0xff;
+ int frame = fields_per_frame ? field / fields_per_frame : field;
+ int second = (timecode >> 8) & 0xff;
+ int minute = (timecode >> 16) & 0xff;
+ int hour = (timecode >> 24) & 0x1f;
+ int drop = (timecode >> 29) & 1;
+ // bit 30: color_frame, unused
+ // ignore invalid time code
+ if (timecode >> 31)
+ return 0;
+ snprintf(tmp, sizeof(tmp), "%02d:%02d:%02d%c%02d",
+ hour, minute, second, drop ? ';' : ':', frame);
+ return av_dict_set(pm, key, tmp, 0);
+}
+