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Linshizhi
ffmpeg.wasm-core
Commits
78edce3f
Commit
78edce3f
authored
Oct 19, 2012
by
Justin Ruggles
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atrac3: separate window initialization from IMDCT initialization
parent
c51311b9
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Showing
1 changed file
with
9 additions
and
12 deletions
+9
-12
atrac3.c
libavcodec/atrac3.c
+9
-12
No files found.
libavcodec/atrac3.c
View file @
78edce3f
...
...
@@ -174,7 +174,7 @@ static int decode_bytes(const uint8_t *input, uint8_t *out, int bytes)
return
off
;
}
static
av_cold
int
init_atrac3_transforms
(
ATRAC3Context
*
q
)
static
av_cold
void
init_atrac3_window
(
void
)
{
float
enc_window
[
256
];
int
i
;
...
...
@@ -184,17 +184,12 @@ static av_cold int init_atrac3_transforms(ATRAC3Context *q)
for
(
i
=
0
;
i
<
256
;
i
++
)
enc_window
[
i
]
=
(
sin
(((
i
+
0
.
5
)
/
256
.
0
-
0
.
5
)
*
M_PI
)
+
1
.
0
)
*
0
.
5
;
if
(
!
mdct_window
[
0
])
{
for
(
i
=
0
;
i
<
256
;
i
++
)
{
mdct_window
[
i
]
=
enc_window
[
i
]
/
(
enc_window
[
i
]
*
enc_window
[
i
]
+
enc_window
[
255
-
i
]
*
enc_window
[
255
-
i
]);
mdct_window
[
511
-
i
]
=
mdct_window
[
i
];
}
for
(
i
=
0
;
i
<
256
;
i
++
)
{
mdct_window
[
i
]
=
enc_window
[
i
]
/
(
enc_window
[
i
]
*
enc_window
[
i
]
+
enc_window
[
255
-
i
]
*
enc_window
[
255
-
i
]);
mdct_window
[
511
-
i
]
=
mdct_window
[
i
];
}
/* initialize the MDCT transform */
return
ff_mdct_init
(
&
q
->
mdct_ctx
,
9
,
1
,
1
.
0
/
32768
);
}
static
av_cold
int
atrac3_decode_close
(
AVCodecContext
*
avctx
)
...
...
@@ -956,12 +951,14 @@ static av_cold int atrac3_decode_init(AVCodecContext *avctx)
avctx
->
sample_fmt
=
AV_SAMPLE_FMT_FLTP
;
if
((
ret
=
init_atrac3_transforms
(
q
)))
{
/* initialize the MDCT transform */
if
((
ret
=
ff_mdct_init
(
&
q
->
mdct_ctx
,
9
,
1
,
1
.
0
/
32768
))
<
0
)
{
av_log
(
avctx
,
AV_LOG_ERROR
,
"Error initializing MDCT
\n
"
);
av_freep
(
&
q
->
decoded_bytes_buffer
);
return
ret
;
}
init_atrac3_window
();
ff_atrac_generate_tables
();
/* Generate gain tables */
...
...
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