FFmpeg  4.0
vf_swapuv.c
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1 /*
2  * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * swap UV filter
24  */
25 
26 #include "libavutil/opt.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/version.h"
29 #include "avfilter.h"
30 #include "formats.h"
31 #include "internal.h"
32 #include "video.h"
33 
34 typedef struct SwapUVContext {
35  const AVClass *class;
37 
38 static const AVOption swapuv_options[] = {
39  { NULL }
40 };
41 
42 AVFILTER_DEFINE_CLASS(swapuv);
43 
44 static void do_swap(AVFrame *frame)
45 {
46  FFSWAP(uint8_t*, frame->data[1], frame->data[2]);
47  FFSWAP(int, frame->linesize[1], frame->linesize[2]);
48  FFSWAP(AVBufferRef*, frame->buf[1], frame->buf[2]);
49 
50 #if FF_API_ERROR_FRAME
52  FFSWAP(uint64_t, frame->error[1], frame->error[2]);
54 #endif
55 }
56 
57 static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
58 {
59  AVFrame *picref = ff_default_get_video_buffer(link, w, h);
60  do_swap(picref);
61  return picref;
62 }
63 
64 static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
65 {
66  do_swap(inpicref);
67  return ff_filter_frame(link->dst->outputs[0], inpicref);
68 }
69 
71 {
72  int i;
73 
75  desc->nb_components < 3 ||
76  (desc->comp[1].depth != desc->comp[2].depth))
77  return 0;
78  for (i = 0; i < desc->nb_components; i++) {
79  if (desc->comp[i].offset != 0 ||
80  desc->comp[i].shift != 0 ||
81  desc->comp[i].plane != i)
82  return 0;
83  }
84 
85  return 1;
86 }
87 
89 {
91  int fmt, ret;
92 
93  for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
95  if (is_planar_yuv(desc) && (ret = ff_add_format(&formats, fmt)) < 0)
96  return ret;
97  }
98 
99  return ff_set_common_formats(ctx, formats);
100 }
101 
102 static const AVFilterPad swapuv_inputs[] = {
103  {
104  .name = "default",
105  .type = AVMEDIA_TYPE_VIDEO,
106  .get_video_buffer = get_video_buffer,
107  .filter_frame = filter_frame,
108  },
109  { NULL }
110 };
111 
112 static const AVFilterPad swapuv_outputs[] = {
113  {
114  .name = "default",
115  .type = AVMEDIA_TYPE_VIDEO,
116  },
117  { NULL }
118 };
119 
121  .name = "swapuv",
122  .description = NULL_IF_CONFIG_SMALL("Swap U and V components."),
123  .query_formats = query_formats,
124  .priv_size = sizeof(SwapUVContext),
125  .priv_class = &swapuv_class,
126  .inputs = swapuv_inputs,
127  .outputs = swapuv_outputs,
129 };
int plane
Which of the 4 planes contains the component.
Definition: pixdesc.h:35
#define NULL
Definition: coverity.c:32
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2363
This structure describes decoded (raw) audio or video data.
Definition: frame.h:218
AVOption.
Definition: opt.h:246
static int query_formats(AVFilterContext *ctx)
Definition: vf_swapuv.c:88
const char * fmt
Definition: avisynth_c.h:769
Main libavfilter public API header.
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:410
const char * desc
Definition: nvenc.c:65
static int is_planar_yuv(const AVPixFmtDescriptor *desc)
Definition: vf_swapuv.c:70
static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
Definition: vf_swapuv.c:64
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:125
const char * name
Pad name.
Definition: internal.h:60
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1080
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:117
uint8_t
#define AV_PIX_FMT_FLAG_ALPHA
The pixel format has an alpha channel.
Definition: pixdesc.h:181
AVOptions.
static AVFrame * frame
static int flags
Definition: log.c:55
attribute_deprecated uint64_t error[AV_NUM_DATA_POINTERS]
Definition: frame.h:353
static const AVOption swapuv_options[]
Definition: vf_swapuv.c:38
A filter pad used for either input or output.
Definition: internal.h:54
AVFilter ff_vf_swapuv
Definition: vf_swapuv.c:120
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:568
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:337
Libavutil version macros.
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:106
uint8_t nb_components
The number of components each pixel has, (1-4)
Definition: pixdesc.h:83
uint8_t w
Definition: llviddspenc.c:38
AVFormatContext * ctx
Definition: movenc.c:48
static void do_swap(AVFrame *frame)
Definition: vf_swapuv.c:44
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:249
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
const char * name
Filter name.
Definition: avfilter.h:148
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
int shift
Number of least significant bits that must be shifted away to get the value.
Definition: pixdesc.h:53
int offset
Number of elements before the component of the first pixel.
Definition: pixdesc.h:47
static AVFrame * get_video_buffer(AVFilterLink *link, int w, int h)
Definition: vf_swapuv.c:57
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:232
AVFrame * ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:44
A reference to a data buffer.
Definition: buffer.h:81
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
AVFILTER_DEFINE_CLASS(swapuv)
#define AV_PIX_FMT_FLAG_BE
Pixel format is big-endian.
Definition: pixdesc.h:128
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:338
formats
Definition: signature.h:48
#define FFSWAP(type, a, b)
Definition: common.h:99
static const AVFilterPad swapuv_inputs[]
Definition: vf_swapuv.c:102
static const AVFilterPad swapuv_outputs[]
Definition: vf_swapuv.c:112
internal API functions
int depth
Number of bits in the component.
Definition: pixdesc.h:58
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
Definition: pixdesc.h:144