FFmpeg
swscale.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 #include "libswscale/swscale.h"
22 #include "libavutil/arm/cpu.h"
23 
24 void ff_hscale_8_to_15_neon(SwsContext *c, int16_t *dst, int dstW,
25  const uint8_t *src, const int16_t *filter,
26  const int32_t *filterPos, int filterSize);
27 
28 void ff_yuv2planeX_8_neon(const int16_t *filter, int filterSize,
29  const int16_t **src, uint8_t *dest, int dstW,
30  const uint8_t *dither, int offset);
31 
33 {
35 
36  if (have_neon(cpu_flags)) {
37  if (c->srcBpc == 8 && c->dstBpc <= 14 &&
38  (c->hLumFilterSize % 8) == 0 &&
39  (c->hChrFilterSize % 8) == 0)
40  {
42  }
43  if (c->dstBpc == 8) {
45  }
46  }
47 }
void(* hcScale)(struct SwsContext *c, int16_t *dst, int dstW, const uint8_t *src, const int16_t *filter, const int32_t *filterPos, int filterSize)
void(* hyScale)(struct SwsContext *c, int16_t *dst, int dstW, const uint8_t *src, const int16_t *filter, const int32_t *filterPos, int filterSize)
Scale one horizontal line of input data using a filter over the input lines, to produce one (differen...
static atomic_int cpu_flags
Definition: cpu.c:50
uint8_t
#define av_cold
Definition: attributes.h:88
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
external API header
#define src
Definition: vp8dsp.c:254
void ff_yuv2planeX_8_neon(const int16_t *filter, int filterSize, const int16_t **src, uint8_t *dest, int dstW, const uint8_t *dither, int offset)
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce then the filter should push the output frames on the output link immediately As an exception to the previous rule if the input frame is enough to produce several output frames then the filter needs output only at least one per link The additional frames can be left buffered in the filter
int hLumFilterSize
Horizontal filter size for luma/alpha pixels.
static const uint8_t dither[8][8]
Definition: vf_fspp.c:57
int hChrFilterSize
Horizontal filter size for chroma pixels.
#define have_neon(flags)
Definition: cpu.h:26
int32_t
void ff_hscale_8_to_15_neon(SwsContext *c, int16_t *dst, int dstW, const uint8_t *src, const int16_t *filter, const int32_t *filterPos, int filterSize)
yuv2planarX_fn yuv2planeX
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:95
av_cold void ff_sws_init_swscale_arm(SwsContext *c)
Definition: swscale.c:32