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libavcodec
celp_math.h
Go to the documentation of this file.
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/*
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* Various fixed-point math operations
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*
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* Copyright (c) 2008 Vladimir Voroshilov
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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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#ifndef AVCODEC_CELP_MATH_H
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#define AVCODEC_CELP_MATH_H
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#include <stdint.h>
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typedef
struct
CELPMContext
{
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/**
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* Return the dot product.
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* @param a input data array
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* @param b input data array
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* @param length number of elements
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*
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* @return dot product = sum of elementwise products
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*/
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float (*
dot_productf
)(
const
float
*
a
,
const
float
*
b
,
int
length
);
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}
CELPMContext
;
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/**
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* Initialize CELPMContext.
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*/
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void
ff_celp_math_init
(
CELPMContext
*
c
);
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void
ff_celp_math_init_mips
(
CELPMContext
*
c
);
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/**
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* fixed-point implementation of exp2(x) in [0; 1] domain.
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* @param power argument to exp2, 0 <= power <= 0x7fff
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*
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* @return value of (1<<20) * exp2(power / (1<<15))
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* 0x8000c <= result <= 0xfffea
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*/
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int
ff_exp2
(uint16_t power);
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/**
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* Calculate log2(x).
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* @param value function argument, 0 < value <= 7fff ffff
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*
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* @return value of (1<<15) * log2(value)
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*/
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int
ff_log2_q15
(uint32_t
value
);
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/**
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* Shift value left or right depending on sign of offset parameter.
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* @param value value to shift
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* @param offset shift offset
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*
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* @return value << offset, if offset>=0; value >> -offset - otherwise
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*/
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static
inline
int
bidir_sal
(
int
value
,
int
offset
)
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{
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if
(offset < 0)
return
value >> -
offset
;
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else
return
value <<
offset
;
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}
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/**
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* returns the dot product of 2 int16_t vectors.
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* @param a input data array
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* @param b input data array
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* @param length number of elements
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*
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* @return dot product = sum of elementwise products
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*/
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int64_t
ff_dot_product
(
const
int16_t *
a
,
const
int16_t *
b
,
int
length
);
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/**
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* Return the dot product.
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* @param a input data array
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* @param b input data array
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* @param length number of elements
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*
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* @return dot product = sum of elementwise products
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*/
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float
ff_dot_productf
(
const
float
*
a
,
const
float
*
b
,
int
length
);
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#endif
/* AVCODEC_CELP_MATH_H */
ff_celp_math_init_mips
void ff_celp_math_init_mips(CELPMContext *c)
Definition:
celp_math_mips.c:85
b
const char * b
Definition:
vf_curves.c:109
ff_exp2
int ff_exp2(uint16_t power)
fixed-point implementation of exp2(x) in [0; 1] domain.
Definition:
celp_math.c:48
CELPMContext::dot_productf
float(* dot_productf)(const float *a, const float *b, int length)
Return the dot product.
Definition:
celp_math.h:37
ff_dot_productf
float ff_dot_productf(const float *a, const float *b, int length)
Return the dot product.
Definition:
celp_math.c:109
length
GLsizei GLsizei * length
Definition:
opengl_enc.c:115
offset
static const uint8_t offset[127][2]
Definition:
vf_spp.c:92
CELPMContext
Definition:
celp_math.h:28
value
GLsizei GLboolean const GLfloat * value
Definition:
opengl_enc.c:109
ff_celp_math_init
void ff_celp_math_init(CELPMContext *c)
Initialize CELPMContext.
Definition:
celp_math.c:120
c
static double c[64]
Definition:
vsrc_mptestsrc.c:87
bidir_sal
static int bidir_sal(int value, int offset)
Shift value left or right depending on sign of offset parameter.
Definition:
celp_math.h:71
ff_dot_product
int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length)
returns the dot product of 2 int16_t vectors.
Definition:
celp_math.c:98
ff_log2_q15
int ff_log2_q15(uint32_t value)
Calculate log2(x).
Definition:
celp_math.c:78
a
a
Definition:
h264pred_template.c:468
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