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libavcodec
alpha
pixblockdsp_alpha.c
Go to the documentation of this file.
1
/*
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* SIMD-optimized pixel operations
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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 "
libavutil/attributes.h
"
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#include "
libavcodec/pixblockdsp.h
"
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#include "
asm.h
"
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static
void
get_pixels_mvi
(int16_t *restrict
block
,
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const
uint8_t
*restrict pixels, ptrdiff_t line_size)
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{
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int
h = 8;
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do
{
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uint64_t p;
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p =
ldq
(pixels);
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stq
(
unpkbw
(p), block);
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stq
(
unpkbw
(p >> 32), block + 4);
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pixels += line_size;
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block += 8;
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}
while
(--h);
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}
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static
void
diff_pixels_mvi
(int16_t *
block
,
const
uint8_t
*
s1
,
const
uint8_t
*
s2
,
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int
stride
) {
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int
h = 8;
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uint64_t
mask
= 0x4040;
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mask |= mask << 16;
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mask |= mask << 32;
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do
{
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uint64_t x,
y
,
c
, d,
a
;
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uint64_t signs;
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x =
ldq
(s1);
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y =
ldq
(s2);
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c =
cmpbge
(x, y);
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d = x -
y
;
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a =
zap
(mask, c);
/* We use 0x4040404040404040 here... */
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d += 4 *
a
;
/* ...so we can use s4addq here. */
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signs =
zap
(-1, c);
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stq
(
unpkbw
(d) | (
unpkbw
(signs) << 8), block);
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stq
(
unpkbw
(d >> 32) | (
unpkbw
(signs >> 32) << 8), block + 4);
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s1 += stride;
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s2 += stride;
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block += 8;
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}
while
(--h);
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}
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av_cold
void
ff_pixblockdsp_init_alpha
(
PixblockDSPContext
*
c
,
AVCodecContext
*avctx,
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unsigned
high_bit_depth)
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{
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if
(
amask
(
AMASK_MVI
) == 0) {
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if
(!high_bit_depth)
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c->
get_pixels
=
get_pixels_mvi
;
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c->
diff_pixels
=
diff_pixels_mvi
;
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}
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}
Generated on Thu Sep 30 2021 22:46:55 for FFmpeg by
1.8.1.2