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FFmpeg/libavcodec/riscv/opusdsp_init.c
Rémi Denis-Courmont adc87a5f7c lavc/opusdsp: rewrite R-V V postfilter
This uses a more traditional approach allowing up processing of up to
period minus two elements per iteration. This also allows the algorithm
to work for all and any vector length.

As the T-Head C908 device under test can load 16 elements loop, there is
unsurprisingly a little performance drop when the period is minimal and
the parallelism is capped at 13 elements:

Before:
postfilter_15_c:         21222.2
postfilter_15_rvv_f32:   22007.7
postfilter_512_c:        20189.7
postfilter_512_rvv_f32:  22004.2
postfilter_1022_c:       20189.7
postfilter_1022_rvv_f32: 22004.2

After:
postfilter_15_c:         20189.5
postfilter_15_rvv_f32:    7057.2
postfilter_512_c:        20189.5
postfilter_512_rvv_f32:   5667.2
postfilter_1022_c:       20192.7
postfilter_1022_rvv_f32:  5667.2
2023-11-06 22:09:30 +02:00

40 lines
1.3 KiB
C

/*
* Copyright © 2022 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 "libavutil/riscv/cpu.h"
#include "libavcodec/opusdsp.h"
void ff_opus_postfilter_rvv(float *data, int period, float *g, int len);
av_cold void ff_opus_dsp_init_riscv(OpusDSP *d)
{
#if HAVE_RVV
int flags = av_get_cpu_flags();
if ((flags & AV_CPU_FLAG_RVV_F32) && (flags & AV_CPU_FLAG_RVB_ADDR) &&
(flags & AV_CPU_FLAG_RVB_BASIC))
d->postfilter = ff_opus_postfilter_rvv;
#endif
}