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/*
* Copyright (c) 2024 Zhao Zhili <quinkblack@foxmail.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/aarch64/asm.S"
.macro rgb24_to_yuv_load_rgb, src
ld3 { v16.16b, v17.16b, v18.16b }, [\src]
uxtl v19.8h, v16.8b // v19: r
uxtl v20.8h, v17.8b // v20: g
uxtl v21.8h, v18.8b // v21: b
uxtl2 v22.8h, v16.16b // v22: r
uxtl2 v23.8h, v17.16b // v23: g
uxtl2 v24.8h, v18.16b // v24: b
.endm
.macro rgb24_to_yuv_product, r, g, b, dst1, dst2, dst, coef0, coef1, coef2, right_shift
mov \dst1\().16b, v6.16b // dst1 = const_offset
mov \dst2\().16b, v6.16b // dst2 = const_offset
smlal \dst1\().4s, \coef0\().4h, \r\().4h // dst1 += rx * r
smlal \dst1\().4s, \coef1\().4h, \g\().4h // dst1 += gx * g
smlal \dst1\().4s, \coef2\().4h, \b\().4h // dst1 += bx * b
smlal2 \dst2\().4s, \coef0\().8h, \r\().8h // dst2 += rx * r
smlal2 \dst2\().4s, \coef1\().8h, \g\().8h // dst2 += gx * g
smlal2 \dst2\().4s, \coef2\().8h, \b\().8h // dst2 += bx * b
sqshrn \dst\().4h, \dst1\().4s, \right_shift // dst_lower_half = dst1 >> right_shift
sqshrn2 \dst\().8h, \dst2\().4s, \right_shift // dst_higher_half = dst2 >> right_shift
.endm
function ff_rgb24ToY_neon, export=1
cmp w4, #0 // check width > 0
ldp w10, w11, [x5] // w10: ry, w11: gy
ldr w12, [x5, #8] // w12: by
b.le 3f
mov w9, #256 // w9 = 1 << (RGB2YUV_SHIFT - 7)
movk w9, #8, lsl #16 // w9 += 32 << (RGB2YUV_SHIFT - 1)
dup v6.4s, w9 // w9: const_offset
cmp w4, #16
dup v0.8h, w10
dup v1.8h, w11
dup v2.8h, w12
b.lt 2f
1:
rgb24_to_yuv_load_rgb x1
rgb24_to_yuv_product v19, v20, v21, v25, v26, v16, v0, v1, v2, #9
rgb24_to_yuv_product v22, v23, v24, v27, v28, v17, v0, v1, v2, #9
sub w4, w4, #16 // width -= 16
add x1, x1, #48 // src += 48
cmp w4, #16 // width >= 16 ?
stp q16, q17, [x0], #32 // store to dst
b.ge 1b
cbz x4, 3f
2:
ldrb w13, [x1] // w13: r
ldrb w14, [x1, #1] // w14: g
ldrb w15, [x1, #2] // w15: b
smaddl x13, w13, w10, x9 // x13 = ry * r + const_offset
smaddl x13, w14, w11, x13 // x13 += gy * g
smaddl x13, w15, w12, x13 // x13 += by * b
asr w13, w13, #9 // x13 >>= 9
sub w4, w4, #1 // width--
add x1, x1, #3 // src += 3
strh w13, [x0], #2 // store to dst
cbnz w4, 2b
3:
ret
endfunc
.macro rgb24_load_uv_coeff half
ldp w10, w11, [x6, #12] // w10: ru, w11: gu
ldp w12, w13, [x6, #20] // w12: bu, w13: rv
ldp w14, w15, [x6, #28] // w14: gv, w15: bv
.if \half
mov w9, #512
movk w9, #128, lsl #16 // w9: const_offset
.else
mov w9, #256
movk w9, #64, lsl #16 // w9: const_offset
.endif
dup v0.8h, w10
dup v1.8h, w11
dup v2.8h, w12
dup v3.8h, w13
dup v4.8h, w14
dup v5.8h, w15
dup v6.4s, w9
.endm
function ff_rgb24ToUV_half_neon, export=1
cmp w5, #0 // check width > 0
b.le 3f
cmp w5, #8
rgb24_load_uv_coeff half=1
b.lt 2f
1:
ld3 { v16.16b, v17.16b, v18.16b }, [x3]
uaddlp v19.8h, v16.16b // v19: r
uaddlp v20.8h, v17.16b // v20: g
uaddlp v21.8h, v18.16b // v21: b
rgb24_to_yuv_product v19, v20, v21, v22, v23, v16, v0, v1, v2, #10
rgb24_to_yuv_product v19, v20, v21, v24, v25, v17, v3, v4, v5, #10
sub w5, w5, #8 // width -= 8
add x3, x3, #48 // src += 48
cmp w5, #8 // width >= 8 ?
str q16, [x0], #16 // store dst_u
str q17, [x1], #16 // store dst_v
b.ge 1b
cbz w5, 3f
2:
ldrb w2, [x3] // w2: r1
ldrb w4, [x3, #3] // w4: r2
add w2, w2, w4 // w2 = r1 + r2
ldrb w4, [x3, #1] // w4: g1
ldrb w7, [x3, #4] // w7: g2
add w4, w4, w7 // w4 = g1 + g2
ldrb w7, [x3, #2] // w7: b1
ldrb w8, [x3, #5] // w8: b2
add w7, w7, w8 // w7 = b1 + b2
smaddl x8, w2, w10, x9 // dst_u = ru * r + const_offset
smaddl x8, w4, w11, x8 // dst_u += gu * g
smaddl x8, w7, w12, x8 // dst_u += bu * b
asr x8, x8, #10 // dst_u >>= 10
strh w8, [x0], #2 // store dst_u
smaddl x8, w2, w13, x9 // dst_v = rv * r + const_offset
smaddl x8, w4, w14, x8 // dst_v += gv * g
smaddl x8, w7, w15, x8 // dst_v += bv * b
asr x8, x8, #10 // dst_v >>= 10
sub w5, w5, #1
add x3, x3, #6 // src += 6
strh w8, [x1], #2 // store dst_v
cbnz w5, 2b
3:
ret
endfunc
function ff_rgb24ToUV_neon, export=1
cmp w5, #0 // check width > 0
b.le 3f
cmp w5, #16
rgb24_load_uv_coeff half=0
b.lt 2f
1:
rgb24_to_yuv_load_rgb x3
rgb24_to_yuv_product v19, v20, v21, v25, v26, v16, v0, v1, v2, #9
rgb24_to_yuv_product v22, v23, v24, v27, v28, v17, v0, v1, v2, #9
rgb24_to_yuv_product v19, v20, v21, v25, v26, v18, v3, v4, v5, #9
rgb24_to_yuv_product v22, v23, v24, v27, v28, v19, v3, v4, v5, #9
sub w5, w5, #16
add x3, x3, #48 // src += 48
cmp w5, #16
stp q16, q17, [x0], #32 // store to dst_u
stp q18, q19, [x1], #32 // store to dst_v
b.ge 1b
cbz w5, 3f
2:
ldrb w16, [x3] // w16: r
ldrb w17, [x3, #1] // w17: g
ldrb w4, [x3, #2] // w4: b
smaddl x8, w16, w10, x9 // x8 = ru * r + const_offset
smaddl x8, w17, w11, x8 // x8 += gu * g
smaddl x8, w4, w12, x8 // x8 += bu * b
asr w8, w8, #9 // x8 >>= 9
strh w8, [x0], #2 // store to dst_u
smaddl x8, w16, w13, x9 // x8 = rv * r + const_offset
smaddl x8, w17, w14, x8 // x8 += gv * g
smaddl x8, w4, w15, x8 // x8 += bv * b
asr w8, w8, #9 // x8 >>= 9
sub w5, w5, #1 // width--
add x3, x3, #3 // src += 3
strh w8, [x1], #2 // store to dst_v
cbnz w5, 2b
3:
ret
endfunc
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