}
#if CONFIG_LIBGSM_DECODER
-AVCodec ff_libgsm_decoder = {
+const AVCodec ff_libgsm_decoder = {
.name = "libgsm",
.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
.type = AVMEDIA_TYPE_AUDIO,
};
#endif
#if CONFIG_LIBGSM_MS_DECODER
-AVCodec ff_libgsm_ms_decoder = {
+const AVCodec ff_libgsm_ms_decoder = {
.name = "libgsm_ms",
.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
.type = AVMEDIA_TYPE_AUDIO,