BufferedFrame frame = input_state->buffered_frames[signal_num][0];
const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
lua_pushnumber(L, userdata->last_height[frame.field_number]);
BufferedFrame frame = input_state->buffered_frames[signal_num][0];
const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)frame.frame->userdata;
lua_pushnumber(L, userdata->last_height[frame.field_number]);