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lavfi/vf_blackdetect: R-V V count_pixels_8

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SpacemiT X60:
blackdetect8_c:                                      14911.0 ( 1.00x)
blackdetect8_rvv_i32:                                  369.5 (40.35x)
This commit is contained in:
Rémi Denis-Courmont
2025-12-15 20:37:54 +02:00
parent 1d662641c5
commit 570908af09
4 changed files with 97 additions and 2 deletions
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2
libavfilter/riscv/Makefile
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@@ -1,4 +1,6 @@
OBJS-$(CONFIG_AFIR_FILTER) += riscv/af_afir_init.o
RVV-OBJS-$(CONFIG_AFIR_FILTER) += riscv/af_afir_rvv.o
OBJS-$(CONFIG_BLACKDETECT_FILTER) += riscv/vf_blackdetect_init.o
RVV-OBJS-$(CONFIG_BLACKDETECT_FILTER) += riscv/vf_blackdetect_rvv.o
SHLIBOBJS += riscv/cpu_common.o

42
libavfilter/riscv/vf_blackdetect_init.c Normal file
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@@ -0,0 +1,42 @@
/*
* Copyright © 2025 Rémi Denis-Courmont.
*
* 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 "config.h"
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavfilter/vf_blackdetect.h"
unsigned ff_count_pixels_8_rvv(const uint8_t *src, ptrdiff_t stride,
ptrdiff_t width, ptrdiff_t height,
unsigned threshold);
ff_blackdetect_fn ff_blackdetect_get_fn_riscv(int depth)
{
#if HAVE_RVV
int flags = av_get_cpu_flags();
if (flags & AV_CPU_FLAG_RVV_I32) {
if (depth <= 8)
return ff_count_pixels_8_rvv;
}
#endif
return NULL;
}

45
libavfilter/riscv/vf_blackdetect_rvv.S Normal file
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@@ -0,0 +1,45 @@
/*
* Copyright © 2025 Rémi Denis-Courmont.
*
* 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/riscv/asm.S"
func ff_count_pixels_8_rvv, zve32x
lpad 0
mv a5, zero
sub a1, a1, a2
1:
mv t2, a2
addi a3, a3, -1
2:
vsetvli t1, t2, e8, m8, ta, ma
vle8.v v8, (a0)
sub t2, t2, t1
vmsleu.vx v0, v8, a4
add a0, t1, a0
vcpop.m t3, v0
add a5, t3, a5
bnez t2, 2b
add a0, a0, a1
bnez a3, 1b
mv a0, a5
ret
endfunc

10
libavfilter/vf_blackdetect.h
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@@ -28,6 +28,7 @@ typedef unsigned (*ff_blackdetect_fn)(const uint8_t *src, ptrdiff_t stride,
ptrdiff_t width, ptrdiff_t height,
unsigned threshold);
ff_blackdetect_fn ff_blackdetect_get_fn_riscv(int depth);
ff_blackdetect_fn ff_blackdetect_get_fn_x86(int depth);
static unsigned count_pixels8_c(const uint8_t *src, ptrdiff_t stride,
@@ -60,9 +61,14 @@ static unsigned count_pixels16_c(const uint8_t *src, ptrdiff_t stride,
static inline ff_blackdetect_fn ff_blackdetect_get_fn(int depth)
{
ff_blackdetect_fn fn = NULL;
#if ARCH_X86 && HAVE_X86ASM
ff_blackdetect_fn fn;
#if ARCH_RISCV
fn = ff_blackdetect_get_fn_riscv(depth);
#elif ARCH_X86 && HAVE_X86ASM
fn = ff_blackdetect_get_fn_x86(depth);
#else
fn = NULL;
#endif
if (!fn)