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616fdeaea3
There is no known (real) hardware with V and without the complete B extension. B was indeed required in the RISC-V application profile from 2022, earlier than V. There should not be any relevant hardware in the future either. In practice, different R-V Vector optimisations in FFmpeg already depend on every constituent of the B extension anyhow, so it would not work well.
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
/*
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* Copyright © 2022 Rémi Denis-Courmont.
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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 "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/cpu.h"
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#include "libavutil/riscv/cpu.h"
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#include "libavcodec/lpc.h"
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void ff_lpc_apply_welch_window_rvv(const int32_t *, ptrdiff_t, double *);
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void ff_lpc_compute_autocorr_rvv(const double *, ptrdiff_t, int, double *);
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av_cold void ff_lpc_init_riscv(LPCContext *c)
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{
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#if HAVE_RVV && (__riscv_xlen >= 64)
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int flags = av_get_cpu_flags();
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if ((flags & AV_CPU_FLAG_RVV_F64) && (flags & AV_CPU_FLAG_RVB)) {
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c->lpc_apply_welch_window = ff_lpc_apply_welch_window_rvv;
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if (ff_get_rv_vlenb() > c->max_order)
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c->lpc_compute_autocorr = ff_lpc_compute_autocorr_rvv;
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}
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#endif
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}
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