FFmpeg
imgutils_init.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 <stddef.h>
20 #include <stdint.h>
21 
22 #include "libavutil/cpu.h"
23 #include "libavutil/error.h"
24 #include "libavutil/imgutils.h"
26 #include "libavutil/internal.h"
27 
28 #include "cpu.h"
29 
30 void ff_image_copy_plane_uc_from_sse4(uint8_t *dst, ptrdiff_t dst_linesize,
31  const uint8_t *src, ptrdiff_t src_linesize,
32  ptrdiff_t bytewidth, int height);
33 
34 int ff_image_copy_plane_uc_from_x86(uint8_t *dst, ptrdiff_t dst_linesize,
35  const uint8_t *src, ptrdiff_t src_linesize,
36  ptrdiff_t bytewidth, int height)
37 {
39  ptrdiff_t bw_aligned = FFALIGN(bytewidth, 64);
40 
41  if (EXTERNAL_SSE4(cpu_flags) &&
42  bw_aligned <= dst_linesize && bw_aligned <= src_linesize)
43  ff_image_copy_plane_uc_from_sse4(dst, dst_linesize, src, src_linesize,
44  bw_aligned, height);
45  else
46  return AVERROR(ENOSYS);
47 
48  return 0;
49 }
misc image utilities
static atomic_int cpu_flags
Definition: cpu.c:50
#define src
Definition: vp8dsp.c:254
#define EXTERNAL_SSE4(flags)
Definition: cpu.h:68
uint8_t
#define height
#define FFALIGN(x, a)
Definition: macros.h:48
error code definitions
int ff_image_copy_plane_uc_from_x86(uint8_t *dst, ptrdiff_t dst_linesize, const uint8_t *src, ptrdiff_t src_linesize, ptrdiff_t bytewidth, int height)
Definition: imgutils_init.c:34
common internal API header
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:93
void ff_image_copy_plane_uc_from_sse4(uint8_t *dst, ptrdiff_t dst_linesize, const uint8_t *src, ptrdiff_t src_linesize, ptrdiff_t bytewidth, int height)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions