/*
* Copyright (c) 2017 Meng Wang <wangmeng.kids@bytedance.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/arm/asm.S"
#include "neon.S"
function ff_hevc_sao_band_filter_neon_8, export=1
push {r4-r10}
ldr r5, [sp, #28] // width
ldr r4, [sp, #32] // height
ldr r8, [sp, #36] // offset_table
vpush {d8-d15}
mov r12, r4 // r12 = height
mov r6, r0 // r6 = r0 = dst
mov r7, r1 // r7 = r1 = src
vldm r8, {q0-q3}
vmov.u16 q15, #1
vmov.u8 q14, #32
0: pld [r1]
cmp r5, #4
beq 4f
8: subs r4, #1
vld1.8 {d16}, [r1], r3
vshr.u8 d17, d16, #3 // index = [src>>3]
vshll.u8 q9, d17, #1 // lowIndex = 2*index
vadd.u16 q11, q9, q15 // highIndex = (2*index+1) << 8
vshl.u16 q10, q11, #8 // q10: highIndex; q9: lowIndex;
vadd.u16 q10, q9 // combine high and low index;
// Look-up Table Round 1; index range: 0-15
vtbx.8 d24, {q0-q1}, d20
vtbx.8 d25, {q0-q1}, d21
// Look-up Table Round 2; index range: 16-31
vsub.u8 q10, q14 // Look-up with 8bit
vtbx.8 d24, {q2-q3}, d20
vtbx.8 d25, {q2-q3}, d21
vaddw.u8 q13, q12, d16
vqmovun.s16 d8, q13
vst1.8 d8, [r0], r2
bne 8b
subs r5, #8
beq 99f
mov r4, r12
add r6, #8
mov r0, r6
add r7, #8
mov r1, r7
b 0b
4: subs r4, #1
vld1.32 {d16[0]}, [r1], r3
vshr.u8 d17, d16, #3 // src>>3
vshll.u8 q9, d17, #1 // lowIndex = 2*index
vadd.u16 q11, q9, q15 // highIndex = (2*index+1) << 8
vshl.u16 q10, q11, #8 // q10: highIndex; q9: lowIndex;
vadd.u16 q10, q9 // combine high and low index;
// Look-up Table Round 1; index range: 0-15
vtbx.8 d24, {q0-q1}, d20
vtbx.8 d25, {q0-q1}, d21
// Look-up Table Round 2; index range: 16-32
vsub.u8 q10, q14 // Look-up with 8bit
vtbx.8 d24, {q2-q3}, d20
vtbx.8 d25, {q2-q3}, d21
vaddw.u8 q13, q12, d16
vqmovun.s16 d14, q13
vst1.32 d14[0], [r0], r2
bne 4b
b 99f
99:
vpop {d8-d15}
pop {r4-r10}
bx lr
endfunc
function ff_hevc_sao_edge_filter_neon_8, export=1
push {r4-r11}
ldr r5, [sp, #32] // width
ldr r4, [sp, #36] // height
ldr r8, [sp, #40] // a_stride
ldr r9, [sp, #44] // b_stride
ldr r10, [sp, #48] // sao_offset_val
ldr r11, [sp, #52] // edge_idx
vpush {d8-d15}
mov r12, r4 // r12 = height
mov r6, r0 // r6 = r0 = dst
mov r7, r1 // r7 = r1 = src
vld1.8 {d0}, [r11] // edge_idx tabel load in d0 5x8bit
vld1.16 {q1}, [r10] // sao_offset_val table load in q1, 5x16bit
vmov.u8 d1, #2
vmov.u16 q2, #1
0: mov r10, r1
add r10, r8 // src[x + a_stride]
mov r11, r1
add r11, r9 // src[x + b_stride]
pld [r1]
cmp r5, #4
beq 4f
8: subs r4, #1
vld1.8 {d16}, [r1], r3 // src[x] 8x8bit
vld1.8 {d17}, [r10], r3 // src[x + a_stride]
vld1.8 {d18}, [r11], r3 // src[x + b_stride]
vcgt.u8 d8, d16, d17
vshr.u8 d9, d8, #7
vclt.u8 d8, d16, d17
vadd.u8 d8, d9 // diff0
vcgt.u8 d10, d16, d18
vshr.u8 d11, d10, #7
vclt.u8 d10, d16, d18
vadd.u8 d10, d11 // diff1
vadd.s8 d8, d10
vadd.s8 d8, d1
vtbx.8 d9, {d0}, d8 // offset_val
vshll.u8 q6, d9, #1 // lowIndex
vadd.u16 q7, q6, q2
vshl.u16 q10, q7, #8 // highIndex
vadd.u16 q10, q6 // combine lowIndex and highIndex, offset_val
vtbx.8 d22, {q1}, d20
vtbx.8 d23, {q1}, d21
vaddw.u8 q12, q11, d16
vqmovun.s16 d26, q12
vst1.8 d26, [r0], r2
bne 8b
subs r5, #8
beq 99f
mov r4, r12
add r6, #8
mov r0, r6
add r7, #8
mov r1, r7
b 0b
4: subs r4, #1
vld1.32 {d16[0]}, [r1], r3
vld1.32 {d17[0]}, [r10], r3 // src[x + a_stride]
vld1.32 {d18[0]}, [r11], r3 // src[x + b_stride]
vcgt.u8 d8, d16, d17
vshr.u8 d9, d8, #7
vclt.u8 d8, d16, d17
vadd.u8 d8, d9 // diff0
vcgt.u8 d10, d16, d18
vshr.u8 d11, d10, #7
vclt.u8 d10, d16, d18
vadd.u8 d10, d11 // diff1
vadd.s8 d8, d10
vadd.s8 d8, d1
vtbx.8 d9, {d0}, d8 // offset_val
vshll.u8 q6, d9, #1 // lowIndex
vadd.u16 q7, q6, q2
vshl.u16 q10, q7, #8 // highIndex
vadd.u16 q10, q6 // combine lowIndex and highIndex, offset_val
vtbx.8 d22, {q1}, d20
vtbx.8 d23, {q1}, d21
vaddw.u8 q12, q11, d16
vqmovun.s16 d26, q12
vst1.32 d26[0], [r0], r2
bne 4b
b 99f
99:
vpop {d8-d15}
pop {r4-r11}
bx lr
endfunc