FFmpeg
4.4.5
libavcodec
huffyuvencdsp.c
Go to the documentation of this file.
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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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#include "
config.h
"
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#include "
libavutil/attributes.h
"
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#include "
huffyuvencdsp.h
"
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#include "
mathops.h
"
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// 0x00010001 or 0x0001000100010001 or whatever, depending on the cpu's native arithmetic size
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#define pw_1 (ULONG_MAX / UINT16_MAX)
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static
void
diff_int16_c
(uint16_t *dst,
const
uint16_t *
src1
,
const
uint16_t *src2,
unsigned
mask
,
int
w
){
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long
i
;
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#if !HAVE_FAST_UNALIGNED
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if
((
long
)src2 & (
sizeof
(
long
)-1)){
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for
(
i
=0;
i
+3<
w
;
i
+=4){
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dst[
i
+0] = (
src1
[
i
+0]-src2[
i
+0]) &
mask
;
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dst[
i
+1] = (
src1
[
i
+1]-src2[
i
+1]) &
mask
;
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dst[
i
+2] = (
src1
[
i
+2]-src2[
i
+2]) &
mask
;
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dst[
i
+3] = (
src1
[
i
+3]-src2[
i
+3]) &
mask
;
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}
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}
else
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#endif
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{
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unsigned
long
pw_lsb = (
mask
>> 1) *
pw_1
;
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unsigned
long
pw_msb = pw_lsb +
pw_1
;
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for
(
i
= 0;
i
<=
w
- (
int
)
sizeof
(
long
)/2;
i
+=
sizeof
(long)/2) {
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long
a
= *(
long
*)(
src1
+
i
);
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long
b
= *(
long
*)(src2+
i
);
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*(
long
*)(dst+
i
) = ((
a
|pw_msb) - (
b
&pw_lsb)) ^ ((
a
^
b
^pw_msb)&pw_msb);
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}
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}
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for
(;
i
<
w
;
i
++)
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dst[
i
] = (
src1
[
i
] - src2[
i
]) &
mask
;
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}
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static
void
sub_hfyu_median_pred_int16_c
(uint16_t *dst,
const
uint16_t *
src1
,
const
uint16_t *src2,
unsigned
mask
,
int
w
,
int
*left,
int
*left_top){
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int
i
;
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uint16_t l, lt;
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l = *left;
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lt = *left_top;
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for
(
i
=0;
i
<
w
;
i
++){
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const
int
pred
=
mid_pred
(l,
src1
[
i
], (l +
src1
[
i
] - lt) &
mask
);
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lt =
src1
[
i
];
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l = src2[
i
];
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dst[
i
] = (l -
pred
) &
mask
;
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}
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*left = l;
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*left_top = lt;
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}
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av_cold
void
ff_huffyuvencdsp_init
(
HuffYUVEncDSPContext
*
c
,
AVCodecContext
*avctx)
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{
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c
->diff_int16 =
diff_int16_c
;
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c
->sub_hfyu_median_pred_int16 =
sub_hfyu_median_pred_int16_c
;
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if
(
ARCH_X86
)
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ff_huffyuvencdsp_init_x86
(
c
, avctx);
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}
attributes.h
Macro definitions for various function/variable attributes.
av_cold
#define av_cold
Definition:
attributes.h:88
config.h
ARCH_X86
#define ARCH_X86
Definition:
config.h:39
int
int
Definition:
ffmpeg_filter.c:170
a
a
Definition:
h264pred_template.c:468
sub_hfyu_median_pred_int16_c
static void sub_hfyu_median_pred_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w, int *left, int *left_top)
Definition:
huffyuvencdsp.c:53
diff_int16_c
static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w)
Definition:
huffyuvencdsp.c:27
pw_1
#define pw_1
Definition:
huffyuvencdsp.c:25
ff_huffyuvencdsp_init
av_cold void ff_huffyuvencdsp_init(HuffYUVEncDSPContext *c, AVCodecContext *avctx)
Definition:
huffyuvencdsp.c:71
huffyuvencdsp.h
ff_huffyuvencdsp_init_x86
void ff_huffyuvencdsp_init_x86(HuffYUVEncDSPContext *c, AVCodecContext *avctx)
Definition:
huffyuvencdsp_init.c:40
i
int i
Definition:
input.c:407
w
uint8_t w
Definition:
llviddspenc.c:39
mask
static const uint16_t mask[17]
Definition:
lzw.c:38
mid_pred
#define mid_pred
Definition:
mathops.h:97
pred
static const float pred[4]
Definition:
siprdata.h:259
AVCodecContext
main external API structure.
Definition:
avcodec.h:536
HuffYUVEncDSPContext
Definition:
huffyuvencdsp.h:26
src1
#define src1
Definition:
h264pred.c:140
b
const char * b
Definition:
vf_curves.c:118
c
static double c[64]
Definition:
vsrc_mptestsrc.c:92
mathops.h
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