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Linshizhi
ffmpeg.wasm-core
Commits
ec5bd476
Commit
ec5bd476
authored
Aug 21, 2008
by
Michael Niedermayer
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Doxygen syntax consistency.
Originally committed as revision 14899 to
svn://svn.ffmpeg.org/ffmpeg/trunk
parent
8c5da74b
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acelp_math.h
libavcodec/acelp_math.h
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libavcodec/acelp_math.h
View file @
ec5bd476
...
...
@@ -26,38 +26,38 @@
#include <stdint.h>
/**
*
\brief fixed-point implementation of cosine in [0; PI) domain
*
\
param arg fixed-point cosine argument, 0 <= arg < 0x4000
*
fixed-point implementation of cosine in [0; PI) domain.
*
@
param arg fixed-point cosine argument, 0 <= arg < 0x4000
*
*
\
return value of (1<<15) * cos(arg * PI / (1<<14)), -0x8000 <= result <= 0x7fff
*
@
return value of (1<<15) * cos(arg * PI / (1<<14)), -0x8000 <= result <= 0x7fff
*/
int16_t
ff_cos
(
uint16_t
arg
);
/**
*
\brief fixed-point implementation of exp2(x) in [0; 1] domain
*
\
param power argument to exp2, 0 <= power <= 0x7fff
*
fixed-point implementation of exp2(x) in [0; 1] domain.
*
@
param power argument to exp2, 0 <= power <= 0x7fff
*
*
\
return value of (1<<20) * exp2(power / (1<<15))
*
@
return value of (1<<20) * exp2(power / (1<<15))
* 0x8000c <= result <= 0xfffea
*/
int
ff_exp2
(
uint16_t
power
);
/**
*
\brief Calculates log2(x)
*
\
param value function argument, 0 < value <= 7fff ffff
*
Calculates log2(x).
*
@
param value function argument, 0 < value <= 7fff ffff
*
*
\
return value of (1<<15) * log2(value)
*
@
return value of (1<<15) * log2(value)
*/
int
ff_log2
(
uint32_t
value
);
/**
*
\brief returns the dot product
*
\
param a input data array
*
\
param b input data array
*
\
param length number of elements
*
\
param shift right shift by this value will be done after multiplication
*
returns the dot product.
*
@
param a input data array
*
@
param b input data array
*
@
param length number of elements
*
@
param shift right shift by this value will be done after multiplication
*
*
\
return dot product = sum of elementwise products
*
@
return dot product = sum of elementwise products
*/
static
int
dot_product
(
const
int16_t
*
a
,
const
int16_t
*
b
,
int
length
,
int
shift
)
{
...
...
@@ -71,11 +71,11 @@ static int dot_product(const int16_t* a, const int16_t* b, int length, int shift
}
/**
*
\brief
Shift value left or right depending on sign of offset parameter.
*
\
param value value to shift
*
\
param offset shift offset
* Shift value left or right depending on sign of offset parameter.
*
@
param value value to shift
*
@
param offset shift offset
*
*
\
return value << offset, if offset>=0; value >> -offset - otherwise
*
@
return value << offset, if offset>=0; value >> -offset - otherwise
*/
static
inline
int
bidir_sal
(
int
value
,
int
offset
)
{
...
...
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