blanking_codes
static const struct blanking_codes rgb_blanking = { 64, 64, 64 };
static const struct blanking_codes yuv_blanking = { 64, 512, 512 };
const struct blanking_codes *blanking_codes = NULL;
blanking_codes = &rgb_blanking;
blanking_codes = &yuv_blanking;
if (blanking_codes) {
io_write16(sd, REG_BLK_GY, blanking_codes->code_gy);
io_write16(sd, REG_BLK_BU, blanking_codes->code_bu);
io_write16(sd, REG_BLK_RV, blanking_codes->code_rv);