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87 lines
3.3 KiB
87 lines
3.3 KiB
/* -*-arm64-*- |
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* vim: syntax=arm64asm |
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* |
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* AArch64 NEON optimised SAO functions for HEVC decoding |
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* |
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* Copyright (c) 2020 Josh Dekker <josh@itanimul.li> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/aarch64/asm.S" |
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// void sao_band_filter(uint8_t *_dst, uint8_t *_src, |
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// ptrdiff_t stride_dst, ptrdiff_t stride_src, |
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// int16_t *sao_offset_val, int sao_left_class, |
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// int width, int height) |
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function ff_hevc_sao_band_filter_8x8_8_neon, export=1 |
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sub sp, sp, #64 |
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stp xzr, xzr, [sp] |
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stp xzr, xzr, [sp, #16] |
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stp xzr, xzr, [sp, #32] |
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stp xzr, xzr, [sp, #48] |
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mov w8, #4 |
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0: |
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ldrsh x9, [x4, x8, lsl #1] // x9 = sao_offset_val[k+1] |
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subs w8, w8, #1 |
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add w10, w8, w5 // x10 = k + sao_left_class |
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and w10, w10, #0x1F |
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strh w9, [sp, x10, lsl #1] |
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bne 0b |
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ld1 {v16.16b-v19.16b}, [sp], #64 |
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movi v20.8h, #1 |
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1: // beginning of line |
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mov w8, w6 |
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2: |
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// Simple layout for accessing 16bit values |
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// with 8bit LUT. |
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// |
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// 00 01 02 03 04 05 06 07 |
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// +-----------------------------------> |
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// |xDE#xAD|xCA#xFE|xBE#xEF|xFE#xED|.... |
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// +-----------------------------------> |
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// i-0 i-1 i-2 i-3 |
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// dst[x] = av_clip_pixel(src[x] + offset_table[src[x] >> shift]); |
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ld1 {v2.8b}, [x1] |
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// load src[x] |
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uxtl v0.8h, v2.8b |
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// >> shift |
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ushr v2.8h, v0.8h, #3 // BIT_DEPTH - 3 |
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// x2 (access lower short) |
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shl v1.8h, v2.8h, #1 // low (x2, accessing short) |
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// +1 access upper short |
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add v3.8h, v1.8h, v20.8h |
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// shift insert index to upper byte |
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sli v1.8h, v3.8h, #8 |
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// table |
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tbx v2.16b, {v16.16b-v19.16b}, v1.16b |
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// src[x] + table |
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add v1.8h, v0.8h, v2.8h |
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// clip + narrow |
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sqxtun v4.8b, v1.8h |
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// store |
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st1 {v4.8b}, [x0] |
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// done 8 pixels |
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subs w8, w8, #8 |
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bne 2b |
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// finished line |
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subs w7, w7, #1 |
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add x0, x0, x2 // dst += stride_dst |
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add x1, x1, x3 // src += stride_src |
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bne 1b |
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ret |
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endfunc
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