func: int av_grow_packet(AVPacket *pkt,int grow_by) if ( ! pkt -> size )  return av_new_packet ( pkt , grow_by ) ; int av_new_packet(AVPacket *pkt,int size) uint8_t * data = ( ( void * ) 0 ) ; if ( ( ( unsigned int ) size ) < ( ( unsigned int ) size ) + 16 )  data = ( av_malloc ( ( size + 16 ) ) ); if ( data )  memset ( ( data + size ) , 0 , 16 ); pkt -> data = data; pkt -> size = size; pkt -> destruct = av_destruct_packet; if ( ! data )  