*size= 17*min_size/16 + 32;
*size= FFMAX(17*min_size/16 + 32, min_size);
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size){    if(min_size < *size)         return ptr;        *size= 17*min_size/16 + 32;    return av_realloc(ptr, *size);}