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lavc/aarch64: add hevc sao band 8x8 tiling 

bench on AWS Graviton:

hevc_sao_band_8x8_8_c: 317.5
hevc_sao_band_8x8_8_neon: 97.5
hevc_sao_band_16x16_8_c: 1115.0
hevc_sao_band_16x16_8_neon: 322.7
hevc_sao_band_32x32_8_c: 4599.2
hevc_sao_band_32x32_8_neon: 1246.2
hevc_sao_band_48x48_8_c: 10021.7
hevc_sao_band_48x48_8_neon: 2740.5
hevc_sao_band_64x64_8_c: 17635.0
hevc_sao_band_64x64_8_neon: 4875.7

Signed-off-by: J. Dekker <jdek@itanimul.li>
This commit is contained in:
J. Dekker 2021-11-17 05:56:13 +01:00
parent 89a2ed4a8b
commit f63f9be37c
2 changed files with 12 additions and 5 deletions
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6
libavcodec/aarch64/hevcdsp_init_aarch64.c
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@ -77,7 +77,11 @@ av_cold void ff_hevc_dsp_init_aarch64(HEVCDSPContext *c, const int bit_depth)
c->idct_dc[1] = ff_hevc_idct_8x8_dc_8_neon;
c->idct_dc[2] = ff_hevc_idct_16x16_dc_8_neon;
c->idct_dc[3] = ff_hevc_idct_32x32_dc_8_neon;
c->sao_band_filter[0] = ff_hevc_sao_band_filter_8x8_8_neon;
c->sao_band_filter[0] =
c->sao_band_filter[1] =
c->sao_band_filter[2] =
c->sao_band_filter[3] =
c->sao_band_filter[4] = ff_hevc_sao_band_filter_8x8_8_neon;
c->sao_edge_filter[0] = ff_hevc_sao_edge_filter_8x8_8_neon;
c->sao_edge_filter[1] =
c->sao_edge_filter[2] =

11
libavcodec/aarch64/hevcdsp_sao_neon.S
View File

@ -3,7 +3,7 @@
*
* AArch64 NEON optimised SAO functions for HEVC decoding
*
* Copyright (c) 2020 Josh Dekker <josh@itanimul.li>
* Copyright (c) 2020-2021 J. Dekker <jdek@itanimul.li>
*
* This file is part of FFmpeg.
*
@ -35,6 +35,7 @@ function ff_hevc_sao_band_filter_8x8_8_neon, export=1
stp xzr, xzr, [sp, #32]
stp xzr, xzr, [sp, #48]
mov w8, #4
sxtw x6, w6
0: ldrsh x9, [x4, x8, lsl #1] // sao_offset_val[k+1]
subs w8, w8, #1
add w10, w8, w5 // k + sao_left_class
@ -43,7 +44,9 @@ function ff_hevc_sao_band_filter_8x8_8_neon, export=1
bne 0b
ld1 {v16.16b-v19.16b}, [sp], #64
movi v20.8h, #1
1: mov w8, w6 // beginning of line
sub x2, x2, x6 // stride_dst - width
sub x3, x3, x6 // stride_src - width
1: mov x8, x6 // beginning of line
2: // Simple layout for accessing 16bit values
// with 8bit LUT.
//
@ -52,7 +55,7 @@ function ff_hevc_sao_band_filter_8x8_8_neon, export=1
// |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]);
ld1 {v2.8b}, [x1], #8 // 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)
@ -61,7 +64,7 @@ function ff_hevc_sao_band_filter_8x8_8_neon, export=1
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
st1 {v4.8b}, [x0], #8 // store
subs w8, w8, #8 // done 8 pixels
bne 2b
subs w7, w7, #1 // finished line, prep. new