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videolan
vlc-gpu
Commits
d26adda5
Commit
d26adda5
authored
Aug 03, 2008
by
Laurent Aimar
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Plain Diff
Moved static arrays to fft context.
parent
3fb0adb3
Changes
2
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Showing
2 changed files
with
21 additions
and
19 deletions
+21
-19
modules/visualization/visual/fft.c
modules/visualization/visual/fft.c
+13
-19
modules/visualization/visual/fft.h
modules/visualization/visual/fft.h
+8
-0
No files found.
modules/visualization/visual/fft.c
View file @
d26adda5
...
...
@@ -38,20 +38,13 @@
/******************************************************************************
* Local prototypes
*****************************************************************************/
static
void
fft_prepare
(
const
sound_sample
*
input
,
float
*
re
,
float
*
im
);
static
void
fft_calculate
(
float
*
re
,
float
*
im
);
static
void
fft_prepare
(
const
sound_sample
*
input
,
float
*
re
,
float
*
im
,
const
unsigned
int
*
bitReverse
);
static
void
fft_calculate
(
float
*
re
,
float
*
im
,
const
float
*
costable
,
const
float
*
sintable
);
static
void
fft_output
(
const
float
*
re
,
const
float
*
im
,
float
*
output
);
static
int
reverseBits
(
unsigned
int
initial
);
/* Table to speed up bit reverse copy */
static
unsigned
int
bitReverse
[
FFT_BUFFER_SIZE
];
/* The next two tables could be made to use less space in memory, since they
* overlap hugely, but hey. */
static
float
sintable
[
FFT_BUFFER_SIZE
/
2
];
static
float
costable
[
FFT_BUFFER_SIZE
/
2
];
/*****************************************************************************
* These functions are the ones called externally
*****************************************************************************/
...
...
@@ -67,19 +60,19 @@ fft_state *visual_fft_init(void)
fft_state
*
p_state
;
unsigned
int
i
;
p_state
=
(
fft_state
*
)
malloc
(
sizeof
(
fft_state
)
);
p_state
=
malloc
(
sizeof
(
*
p_state
)
);
if
(
!
p_state
)
return
NULL
;
for
(
i
=
0
;
i
<
FFT_BUFFER_SIZE
;
i
++
)
{
bitReverse
[
i
]
=
reverseBits
(
i
);
p_state
->
bitReverse
[
i
]
=
reverseBits
(
i
);
}
for
(
i
=
0
;
i
<
FFT_BUFFER_SIZE
/
2
;
i
++
)
{
float
j
=
2
*
PI
*
i
/
FFT_BUFFER_SIZE
;
costable
[
i
]
=
cos
(
j
);
sintable
[
i
]
=
sin
(
j
);
p_state
->
costable
[
i
]
=
cos
(
j
);
p_state
->
sintable
[
i
]
=
sin
(
j
);
}
return
p_state
;
...
...
@@ -96,10 +89,10 @@ fft_state *visual_fft_init(void)
*/
void
fft_perform
(
const
sound_sample
*
input
,
float
*
output
,
fft_state
*
state
)
{
/* Convert data from sound format to be ready for FFT */
fft_prepare
(
input
,
state
->
real
,
state
->
imag
);
fft_prepare
(
input
,
state
->
real
,
state
->
imag
,
state
->
bitReverse
);
/* Do the actual FFT */
fft_calculate
(
state
->
real
,
state
->
imag
);
fft_calculate
(
state
->
real
,
state
->
imag
,
state
->
costable
,
state
->
sintable
);
/* Convert the FFT output into intensities */
fft_output
(
state
->
real
,
state
->
imag
,
output
);
...
...
@@ -119,7 +112,8 @@ void fft_close(fft_state *state) {
/*
* Prepare data to perform an FFT on
*/
static
void
fft_prepare
(
const
sound_sample
*
input
,
float
*
re
,
float
*
im
)
{
static
void
fft_prepare
(
const
sound_sample
*
input
,
float
*
re
,
float
*
im
,
const
unsigned
int
*
bitReverse
)
{
unsigned
int
i
;
float
*
p_real
=
re
;
float
*
p_imag
=
im
;
...
...
@@ -158,7 +152,7 @@ static void fft_output(const float * re, const float * im, float *output)
/*
* Actually perform the FFT
*/
static
void
fft_calculate
(
float
*
re
,
float
*
im
)
static
void
fft_calculate
(
float
*
re
,
float
*
im
,
const
float
*
costable
,
const
float
*
sintable
)
{
unsigned
int
i
,
j
,
k
;
unsigned
int
exchanges
;
...
...
modules/visualization/visual/fft.h
View file @
d26adda5
...
...
@@ -36,6 +36,14 @@ struct _struct_fft_state {
/* Temporary data stores to perform FFT in. */
float
real
[
FFT_BUFFER_SIZE
];
float
imag
[
FFT_BUFFER_SIZE
];
/* */
unsigned
int
bitReverse
[
FFT_BUFFER_SIZE
];
/* The next two tables could be made to use less space in memory, since they
* overlap hugely, but hey. */
float
sintable
[
FFT_BUFFER_SIZE
/
2
];
float
costable
[
FFT_BUFFER_SIZE
/
2
];
};
/* FFT prototypes */
...
...
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