static void copy_parameter_set(void **to, void **from, int count, int size) { int i; for (i = 0; i < count; i++) { if (to[i] && !from[i]) av_freep(&to[i]); else if (from[i] && !to[i]) to[i] = av_malloc(size); if (from[i]) memcpy(to[i], from[i], size); } }