REG_BLOCK_1
#define OVERLAY_Y_X_START (REG_BLOCK_1 + 0x0000) // Dword offset 00
#define OVERLAY_Y_X_END (REG_BLOCK_1 + 0x0004) // Dword offset 01
#define OVERLAY_GRAPHICS_KEY_CLR (REG_BLOCK_1 + 0x0010) // Dword offset 04
#define OVERLAY_GRAPHICS_KEY_MSK (REG_BLOCK_1 + 0x0014) // Dword offset 05
#define OVERLAY_KEY_CNTL (REG_BLOCK_1 + 0x0018) // Dword offset 06
#define OVERLAY_SCALE_INC (REG_BLOCK_1 + 0x0020) // Dword offset 08
#define OVERLAY_SCALE_CNTL (REG_BLOCK_1 + 0x0024) // Dword offset 09
#define SCALER_HEIGHT_WIDTH (REG_BLOCK_1 + 0x0028) // Dword offset 0a
#define SCALER_BUF0_OFFSET (REG_BLOCK_1 + 0x0034) // Dword offset 0d
#define SCALER_BUF0_PITCH (REG_BLOCK_1 + 0x003c) // Dword offset 0f
#define VIDEO_FORMAT (REG_BLOCK_1 + 0x0048) // Dword offset 12
#define BUF0_OFFSET (REG_BLOCK_1 + 0x0080) // Dword offset 20
#define BUF0_PITCH (REG_BLOCK_1 + 0x008c) // Dword offset 23
#define SCALER_COLOUR_CNTL (REG_BLOCK_1 + 0x0150) // Dword offset 54
#define SCALER_H_COEFF0 (REG_BLOCK_1 + 0x0154) // Dword offset 55
#define SCALER_H_COEFF1 (REG_BLOCK_1 + 0x0158) // Dword offset 56
#define SCALER_H_COEFF2 (REG_BLOCK_1 + 0x015c) // Dword offset 57
#define SCALER_H_COEFF3 (REG_BLOCK_1 + 0x0160) // Dword offset 58
#define SCALER_H_COEFF4 (REG_BLOCK_1 + 0x0164) // Dword offset 59