mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
16fba44b4d
This reverts commit a9214a2ca3, as
it breaks fate-hevc.
Signed-off-by: Martin Storsjö <martin@martin.st>
73 lines
3.3 KiB
ArmAsm
73 lines
3.3 KiB
ArmAsm
/* -*-arm64-*-
|
|
* vim: syntax=arm64asm
|
|
*
|
|
* AArch64 NEON optimised SAO functions for HEVC decoding
|
|
*
|
|
* Copyright (c) 2020 Josh Dekker <josh@itanimul.li>
|
|
*
|
|
* 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"
|
|
|
|
// void sao_band_filter(uint8_t *_dst, uint8_t *_src,
|
|
// ptrdiff_t stride_dst, ptrdiff_t stride_src,
|
|
// int16_t *sao_offset_val, int sao_left_class,
|
|
// int width, int height)
|
|
function ff_hevc_sao_band_filter_8x8_8_neon, export=1
|
|
sub sp, sp, #64
|
|
stp xzr, xzr, [sp]
|
|
stp xzr, xzr, [sp, #16]
|
|
stp xzr, xzr, [sp, #32]
|
|
stp xzr, xzr, [sp, #48]
|
|
mov w8, #4
|
|
0: ldrsh x9, [x4, x8, lsl #1] // sao_offset_val[k+1]
|
|
subs w8, w8, #1
|
|
add w10, w8, w5 // k + sao_left_class
|
|
and w10, w10, #0x1F
|
|
strh w9, [sp, x10, lsl #1]
|
|
bne 0b
|
|
ld1 {v16.16b-v19.16b}, [sp], #64
|
|
movi v20.8h, #1
|
|
1: mov w8, w6 // beginning of line
|
|
2: // Simple layout for accessing 16bit values
|
|
// with 8bit LUT.
|
|
//
|
|
// 00 01 02 03 04 05 06 07
|
|
// +----------------------------------->
|
|
// |xDE#xAD|xCA#xFE|xBE#xEF|xFE#xED|....
|
|
// +----------------------------------->
|
|
// i-0 i-1 i-2 i-3
|
|
ld1 {v2.8b}, [x1] // dst[x] = av_clip_pixel(src[x] + offset_table[src[x] >> shift]);
|
|
uxtl v0.8h, v2.8b // load src[x]
|
|
ushr v2.8h, v0.8h, #3 // >> BIT_DEPTH - 3
|
|
shl v1.8h, v2.8h, #1 // low (x2, accessing short)
|
|
add v3.8h, v1.8h, v20.8h // +1 access upper short
|
|
sli v1.8h, v3.8h, #8 // shift insert index to upper byte
|
|
tbx v2.16b, {v16.16b-v19.16b}, v1.16b // table
|
|
add v1.8h, v0.8h, v2.8h // src[x] + table
|
|
sqxtun v4.8b, v1.8h // clip + narrow
|
|
st1 {v4.8b}, [x0] // store
|
|
subs w8, w8, #8 // done 8 pixels
|
|
bne 2b
|
|
subs w7, w7, #1 // finished line, prep. new
|
|
add x0, x0, x2 // dst += stride_dst
|
|
add x1, x1, x3 // src += stride_src
|
|
bne 1b
|
|
ret
|
|
endfunc
|