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196 lines
9.2 KiB
196 lines
9.2 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) 2022 J. Dekker <jdek@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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#define MAX_PB_SIZE 64 |
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#define AV_INPUT_BUFFER_PADDING_SIZE 64 |
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#define SAO_STRIDE (2*MAX_PB_SIZE + AV_INPUT_BUFFER_PADDING_SIZE) |
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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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stp xzr, xzr, [sp, #-64]! |
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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: ldrsh x9, [x4, x8, lsl #1] // sao_offset_val[k+1] |
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subs w8, w8, #1 |
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add w10, w8, w5 // 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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add w6, w6, #7 |
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bic w6, w6, #7 |
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ld1 {v16.16b-v19.16b}, [sp], #64 |
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sub x2, x2, x6 |
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sub x3, x3, x6 |
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movi v20.8h, #1 |
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1: mov w8, w6 // beginning of line |
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2: // 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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ld1 {v2.8b}, [x1], #8 // dst[x] = av_clip_pixel(src[x] + offset_table[src[x] >> shift]); |
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subs w8, w8, #8 |
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uxtl v0.8h, v2.8b // load src[x] |
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ushr v2.8h, v0.8h, #3 // >> BIT_DEPTH - 3 |
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shl v1.8h, v2.8h, #1 // low (x2, accessing short) |
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add v3.8h, v1.8h, v20.8h // +1 access upper short |
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sli v1.8h, v3.8h, #8 // shift insert index to upper byte |
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tbx v2.16b, {v16.16b-v19.16b}, v1.16b // table |
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add v1.8h, v0.8h, v2.8h // src[x] + table |
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sqxtun v4.8b, v1.8h // clip + narrow |
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st1 {v4.8b}, [x0], #8 // store |
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// done 8 pixels |
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bne 2b |
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subs w7, w7, #1 // finished line, prep. new |
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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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.Lsao_edge_pos: |
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.word 1 // horizontal |
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.word SAO_STRIDE // vertical |
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.word SAO_STRIDE + 1 // 45 degree |
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.word SAO_STRIDE - 1 // 135 degree |
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// ff_hevc_sao_edge_filter_16x16_8_neon(char *dst, char *src, ptrdiff stride_dst, |
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// int16 *sao_offset_val, int eo, int width, int height) |
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function ff_hevc_sao_edge_filter_16x16_8_neon, export=1 |
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adr x7, .Lsao_edge_pos |
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ld1 {v3.8h}, [x3] // load sao_offset_val |
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add w5, w5, #0xF |
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bic w5, w5, #0xF |
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ldr w4, [x7, w4, uxtw #2] // stride_src |
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mov v3.h[7], v3.h[0] // reorder to [1,2,0,3,4] |
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mov v3.h[0], v3.h[1] |
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mov v3.h[1], v3.h[2] |
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mov v3.h[2], v3.h[7] |
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// split 16bit values into two tables |
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uzp2 v1.16b, v3.16b, v3.16b // sao_offset_val -> upper |
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uzp1 v0.16b, v3.16b, v3.16b // sao_offset_val -> lower |
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movi v2.16b, #2 |
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mov x15, #SAO_STRIDE |
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// strides between end of line and next src/dst |
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sub x15, x15, x5 // stride_src - width |
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sub x16, x2, x5 // stride_dst - width |
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mov x11, x1 // copy base src |
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1: // new line |
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mov x14, x5 // copy width |
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sub x12, x11, x4 // src_a (prev) = src - sao_edge_pos |
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add x13, x11, x4 // src_b (next) = src + sao_edge_pos |
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2: // process 16 bytes |
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ld1 {v3.16b}, [x11], #16 // load src |
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ld1 {v4.16b}, [x12], #16 // load src_a (prev) |
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ld1 {v5.16b}, [x13], #16 // load src_b (next) |
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subs x14, x14, #16 |
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cmhi v16.16b, v4.16b, v3.16b // (prev > cur) |
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cmhi v17.16b, v3.16b, v4.16b // (cur > prev) |
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cmhi v18.16b, v5.16b, v3.16b // (next > cur) |
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cmhi v19.16b, v3.16b, v5.16b // (cur > next) |
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sub v20.16b, v16.16b, v17.16b // diff0 = CMP(cur, prev) = (cur > prev) - (cur < prev) |
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sub v21.16b, v18.16b, v19.16b // diff1 = CMP(cur, next) = (cur > next) - (cur < next) |
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add v20.16b, v20.16b, v21.16b // diff = diff0 + diff1 |
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add v20.16b, v20.16b, v2.16b // offset_val = diff + 2 |
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tbl v16.16b, {v0.16b}, v20.16b |
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tbl v17.16b, {v1.16b}, v20.16b |
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uxtl v20.8h, v3.8b // src[0:7] |
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uxtl2 v21.8h, v3.16b // src[7:15] |
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zip1 v18.16b, v16.16b, v17.16b // sao_offset_val lower -> |
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zip2 v19.16b, v16.16b, v17.16b // sao_offset_val upper -> |
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sqadd v20.8h, v18.8h, v20.8h // + sao_offset_val |
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sqadd v21.8h, v19.8h, v21.8h |
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sqxtun v3.8b, v20.8h |
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sqxtun2 v3.16b, v21.8h |
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st1 {v3.16b}, [x0], #16 |
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// filtered 16 bytes |
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b.ne 2b // do we have width to filter? |
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// no width to filter, setup next line |
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subs w6, w6, #1 // filtered line |
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add x11, x11, x15 // stride src to next line |
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add x0, x0, x16 // stride dst to next line |
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b.ne 1b // do we have lines to process? |
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// no lines to filter |
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ret |
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endfunc |
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// ff_hevc_sao_edge_filter_8x8_8_neon(char *dst, char *src, ptrdiff stride_dst, |
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// int16 *sao_offset_val, int eo, int width, int height) |
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function ff_hevc_sao_edge_filter_8x8_8_neon, export=1 |
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adr x7, .Lsao_edge_pos |
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ldr w4, [x7, w4, uxtw #2] |
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ld1 {v3.8h}, [x3] |
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mov v3.h[7], v3.h[0] |
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mov v3.h[0], v3.h[1] |
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mov v3.h[1], v3.h[2] |
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mov v3.h[2], v3.h[7] |
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uzp2 v1.16b, v3.16b, v3.16b |
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uzp1 v0.16b, v3.16b, v3.16b |
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movi v2.16b, #2 |
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add x16, x0, x2 |
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lsl x2, x2, #1 |
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mov x15, #SAO_STRIDE |
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mov x8, x1 |
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sub x9, x1, x4 |
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add x10, x1, x4 |
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1: ld1 {v3.d}[0], [ x8], x15 |
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ld1 {v4.d}[0], [ x9], x15 |
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ld1 {v5.d}[0], [x10], x15 |
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ld1 {v3.d}[1], [ x8], x15 |
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ld1 {v4.d}[1], [ x9], x15 |
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ld1 {v5.d}[1], [x10], x15 |
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subs w6, w6, #2 |
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cmhi v16.16b, v4.16b, v3.16b |
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cmhi v17.16b, v3.16b, v4.16b |
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cmhi v18.16b, v5.16b, v3.16b |
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cmhi v19.16b, v3.16b, v5.16b |
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sub v20.16b, v16.16b, v17.16b |
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sub v21.16b, v18.16b, v19.16b |
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add v20.16b, v20.16b, v21.16b |
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add v20.16b, v20.16b, v2.16b |
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tbl v16.16b, {v0.16b}, v20.16b |
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tbl v17.16b, {v1.16b}, v20.16b |
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uxtl v20.8h, v3.8b |
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uxtl2 v21.8h, v3.16b |
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zip1 v18.16b, v16.16b, v17.16b |
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zip2 v19.16b, v16.16b, v17.16b |
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sqadd v20.8h, v18.8h, v20.8h |
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sqadd v21.8h, v19.8h, v21.8h |
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sqxtun v6.8b, v20.8h |
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sqxtun v7.8b, v21.8h |
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st1 {v6.8b}, [ x0], x2 |
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st1 {v7.8b}, [x16], x2 |
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b.ne 1b |
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ret |
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endfunc
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