+
+static void missing_feature_sample(int sample, void *avc, const char *msg, ...)
+{
+ va_list argument_list;
+
+ va_start(argument_list, msg);
+
+ av_vlog(avc, AV_LOG_WARNING, msg, argument_list);
+ av_log(avc, AV_LOG_WARNING, " is not implemented. Update your Libav "
+ "version to the newest one from Git. If the problem still "
+ "occurs, it means that your file has a feature which has not "
+ "been implemented.\n");
+ if (sample)
+ av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
+ "of this file to ftp://upload.libav.org/incoming/ "
+ "and contact the libav-devel mailing list.\n");
+
+ va_end(argument_list);
+}
+
+void avpriv_request_sample(void *avc, const char *msg, ...)
+{
+ va_list argument_list;
+
+ va_start(argument_list, msg);
+ missing_feature_sample(1, avc, msg, argument_list);
+ va_end(argument_list);
+}
+
+void avpriv_report_missing_feature(void *avc, const char *msg, ...)
+{
+ va_list argument_list;
+
+ va_start(argument_list, msg);
+ missing_feature_sample(0, avc, msg, argument_list);
+ va_end(argument_list);
+}