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体验新版 GitCode,发现更多精彩内容 >>
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92f99a33
编写于
12月 12, 2009
作者:
V
Vitor Sessak
浏览文件
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电子邮件补丁
差异文件
Commit functions used by both AMRNB and SIPR
Originally committed as revision 20805 to
svn://svn.ffmpeg.org/ffmpeg/trunk
上级
dae658d7
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
100 addition
and
0 deletion
+100
-0
libavcodec/acelp_vectors.c
libavcodec/acelp_vectors.c
+54
-0
libavcodec/acelp_vectors.h
libavcodec/acelp_vectors.h
+46
-0
未找到文件。
libavcodec/acelp_vectors.c
浏览文件 @
92f99a33
...
...
@@ -127,6 +127,26 @@ void ff_acelp_fc_pulse_per_track(
fc_v
[
tab2
[
pulse_indexes
]]
+=
(
pulse_signs
&
1
)
?
8191
:
-
8192
;
}
void
ff_decode_10_pulses_35bits
(
const
int16_t
*
fixed_index
,
AMRFixed
*
fixed_sparse
,
const
uint8_t
*
gray_decode
,
int
half_pulse_count
,
int
bits
)
{
int
i
;
int
mask
=
(
1
<<
bits
)
-
1
;
fixed_sparse
->
n
=
2
*
half_pulse_count
;
for
(
i
=
0
;
i
<
half_pulse_count
;
i
++
)
{
const
int
pos1
=
gray_decode
[
fixed_index
[
2
*
i
+
1
]
&
mask
]
+
i
;
const
int
pos2
=
gray_decode
[
fixed_index
[
2
*
i
]
&
mask
]
+
i
;
const
float
sign
=
(
fixed_index
[
2
*
i
+
1
]
&
(
1
<<
bits
))
?
-
1
.
0
:
1
.
0
;
fixed_sparse
->
x
[
2
*
i
+
1
]
=
pos1
;
fixed_sparse
->
x
[
2
*
i
]
=
pos2
;
fixed_sparse
->
y
[
2
*
i
+
1
]
=
sign
;
fixed_sparse
->
y
[
2
*
i
]
=
pos2
<
pos1
?
-
sign
:
sign
;
}
}
void
ff_acelp_weighted_vector_sum
(
int16_t
*
out
,
const
int16_t
*
in_a
,
...
...
@@ -188,3 +208,37 @@ void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in,
for
(
i
=
0
;
i
<
n
;
i
++
)
out
[
i
]
=
in
[
i
]
*
scalefactor
;
}
void
ff_set_fixed_vector
(
float
*
out
,
const
AMRFixed
*
in
,
float
scale
,
int
size
)
{
int
i
;
for
(
i
=
0
;
i
<
in
->
n
;
i
++
)
{
int
x
=
in
->
x
[
i
];
float
y
=
in
->
y
[
i
]
*
scale
;
out
[
x
]
+=
y
;
x
+=
in
->
pitch_lag
;
while
(
x
<
size
)
{
y
*=
in
->
pitch_fac
;
out
[
x
]
+=
y
;
x
+=
in
->
pitch_lag
;
}
}
}
void
ff_clear_fixed_vector
(
float
*
out
,
const
AMRFixed
*
in
,
int
size
)
{
int
i
;
for
(
i
=
0
;
i
<
in
->
n
;
i
++
)
{
int
x
=
in
->
x
[
i
];
out
[
x
]
=
0
.
0
;
x
+=
in
->
pitch_lag
;
while
(
x
<
size
)
{
out
[
x
]
=
0
.
0
;
x
+=
in
->
pitch_lag
;
}
}
}
libavcodec/acelp_vectors.h
浏览文件 @
92f99a33
...
...
@@ -25,6 +25,15 @@
#include <stdint.h>
/** Sparse representation for the algebraic codebook (fixed) vector */
typedef
struct
{
int
n
;
int
x
[
10
];
float
y
[
10
];
int
pitch_lag
;
float
pitch_fac
;
}
AMRFixed
;
/**
* Track|Pulse| Positions
* -------------------------------------------------------------------------
...
...
@@ -125,6 +134,24 @@ void ff_acelp_fc_pulse_per_track(
int
pulse_count
,
int
bits
);
/**
* Decode the algebraic codebook index to pulse positions and signs and
* construct the algebraic codebook vector for MODE_12k2.
*
* @note: The positions and signs are explicitly coded in MODE_12k2.
*
* @param fixed_index positions of the ten pulses
* @param fixed_sparse pointer to the algebraic codebook vector
* @param gray_decode gray decoding table
* @param half_pulse_count number of couples of pulses
* @param bits length of one pulse index in bits
*/
void
ff_decode_10_pulses_35bits
(
const
int16_t
*
fixed_index
,
AMRFixed
*
fixed_sparse
,
const
uint8_t
*
gray_decode
,
int
half_pulse_count
,
int
bits
);
/**
* weighted sum of two vectors with rounding.
* @param out [out] result of addition
...
...
@@ -194,4 +221,23 @@ void ff_adaptative_gain_control(float *buf_out, float speech_energ,
void
ff_scale_vector_to_given_sum_of_squares
(
float
*
out
,
const
float
*
in
,
float
sum_of_squares
,
const
int
n
);
/**
* Add fixed vector to an array from a sparse representation
*
* @param out fixed vector with pitch sharpening
* @param in sparse fixed vector
* @param scale number to multiply the fixed vector by
* @param size the output vector size
*/
void
ff_set_fixed_vector
(
float
*
out
,
const
AMRFixed
*
in
,
float
scale
,
int
size
);
/**
* Clear array values set by set_fixed_vector
*
* @param out fixed vector to be cleared
* @param in sparse fixed vector
* @param size the output vector size
*/
void
ff_clear_fixed_vector
(
float
*
out
,
const
AMRFixed
*
in
,
int
size
);
#endif
/* AVCODEC_ACELP_VECTORS_H */
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