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libavutil
float_dsp.c
Go to the documentation of this file.
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/*
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* Copyright 2005 Balatoni Denes
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* Copyright 2006 Loren Merritt
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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 "
float_dsp.h
"
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static
void
vector_fmul_c
(
float
*
dst
,
const
float
*src0,
const
float
*src1,
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int
len
)
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{
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int
i;
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for
(i = 0; i <
len
; i++)
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dst[i] = src0[i] * src1[i];
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}
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static
void
vector_fmac_scalar_c
(
float
*
dst
,
const
float
*src,
float
mul,
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int
len
)
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{
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int
i;
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for
(i = 0; i <
len
; i++)
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dst[i] += src[i] * mul;
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}
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static
void
vector_fmul_scalar_c
(
float
*
dst
,
const
float
*src,
float
mul,
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int
len
)
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{
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int
i;
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for
(i = 0; i <
len
; i++)
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dst[i] = src[i] * mul;
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}
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static
void
vector_dmul_scalar_c
(
double
*
dst
,
const
double
*src,
double
mul,
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int
len
)
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{
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int
i;
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for
(i = 0; i <
len
; i++)
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dst[i] = src[i] * mul;
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}
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static
void
vector_fmul_window_c
(
float
*
dst
,
const
float
*src0,
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const
float
*src1,
const
float
*win,
int
len
)
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{
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int
i, j;
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dst +=
len
;
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win +=
len
;
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src0 +=
len
;
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for
(i = -len, j = len - 1; i < 0; i++, j--) {
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float
s0
= src0[i];
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float
s1
= src1[j];
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float
wi = win[i];
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float
wj = win[j];
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dst[i] = s0 * wj - s1 * wi;
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dst[j] = s0 * wi + s1 * wj;
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}
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}
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static
void
vector_fmul_add_c
(
float
*
dst
,
const
float
*src0,
const
float
*src1,
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const
float
*src2,
int
len
){
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int
i;
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for
(i = 0; i <
len
; i++)
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dst[i] = src0[i] * src1[i] + src2[i];
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}
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static
void
vector_fmul_reverse_c
(
float
*
dst
,
const
float
*src0,
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const
float
*src1,
int
len
)
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{
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int
i;
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src1 += len-1;
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for
(i = 0; i <
len
; i++)
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dst[i] = src0[i] * src1[-i];
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}
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static
void
butterflies_float_c
(
float
*
av_restrict
v1,
float
*
av_restrict
v2,
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int
len
)
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{
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int
i;
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for
(i = 0; i <
len
; i++) {
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float
t
= v1[i] - v2[i];
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v1[i] += v2[i];
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v2[i] =
t
;
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}
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}
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float
avpriv_scalarproduct_float_c
(
const
float
*v1,
const
float
*v2,
int
len
)
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{
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float
p = 0.0;
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int
i;
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for
(i = 0; i <
len
; i++)
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p += v1[i] * v2[i];
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return
p;
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}
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void
avpriv_float_dsp_init
(
AVFloatDSPContext
*fdsp,
int
bit_exact)
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{
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fdsp->
vector_fmul
=
vector_fmul_c
;
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fdsp->
vector_fmac_scalar
=
vector_fmac_scalar_c
;
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fdsp->
vector_fmul_scalar
=
vector_fmul_scalar_c
;
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fdsp->
vector_dmul_scalar
=
vector_dmul_scalar_c
;
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fdsp->
vector_fmul_window
=
vector_fmul_window_c
;
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fdsp->
vector_fmul_add
=
vector_fmul_add_c
;
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fdsp->
vector_fmul_reverse
=
vector_fmul_reverse_c
;
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fdsp->
butterflies_float
=
butterflies_float_c
;
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fdsp->
scalarproduct_float
=
avpriv_scalarproduct_float_c
;
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#if ARCH_ARM
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ff_float_dsp_init_arm
(fdsp);
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#elif ARCH_PPC
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ff_float_dsp_init_ppc
(fdsp, bit_exact);
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#elif ARCH_X86
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ff_float_dsp_init_x86
(fdsp);
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#elif ARCH_MIPS
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ff_float_dsp_init_mips
(fdsp);
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#endif
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}
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