FFmpeg
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 
52 {
54  do_swap(picref);
55  return picref;
56 }
57 
58 static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
59 {
60  do_swap(inpicref);
61  return ff_filter_frame(link->dst->outputs[0], inpicref);
62 }
63 
65 {
66  int i;
67 
69  desc->nb_components < 3 ||
70  (desc->comp[1].depth != desc->comp[2].depth))
71  return 0;
72  for (i = 0; i < desc->nb_components; i++) {
73  if (desc->comp[i].offset != 0 ||
74  desc->comp[i].shift != 0 ||
75  desc->comp[i].plane != i)
76  return 0;
77  }
78 
79  return 1;
80 }
81 
83 {
85  int fmt, ret;
86 
87  for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
89  if (is_planar_yuv(desc) && (ret = ff_add_format(&formats, fmt)) < 0)
90  return ret;
91  }
92 
94 }
95 
96 static const AVFilterPad swapuv_inputs[] = {
97  {
98  .name = "default",
99  .type = AVMEDIA_TYPE_VIDEO,
100  .get_buffer.video = get_video_buffer,
101  .filter_frame = filter_frame,
102  },
103 };
104 
105 static const AVFilterPad swapuv_outputs[] = {
106  {
107  .name = "default",
108  .type = AVMEDIA_TYPE_VIDEO,
109  },
110 };
111 
113  .name = "swapuv",
114  .description = NULL_IF_CONFIG_SMALL("Swap U and V components."),
115  .priv_size = sizeof(SwapUVContext),
116  .priv_class = &swapuv_class,
121 };
formats
formats
Definition: signature.h:48
opt.h
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1018
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2564
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:247
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:168
get_video_buffer
static AVFrame * get_video_buffer(AVFilterLink *link, int w, int h)
Definition: vf_swapuv.c:51
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:153
video.h
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
formats.h
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(swapuv)
ff_default_get_video_buffer
AVFrame * ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:43
swapuv_outputs
static const AVFilterPad swapuv_outputs[]
Definition: vf_swapuv.c:105
swapuv_inputs
static const AVFilterPad swapuv_inputs[]
Definition: vf_swapuv.c:96
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
ff_set_common_formats
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:699
do_swap
static void do_swap(AVFrame *frame)
Definition: vf_swapuv.c:44
AV_PIX_FMT_FLAG_ALPHA
#define AV_PIX_FMT_FLAG_ALPHA
The pixel format has an alpha channel.
Definition: pixdesc.h:147
ctx
AVFormatContext * ctx
Definition: movenc.c:48
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:191
link
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 link
Definition: filter_design.txt:23
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_swapuv.c:82
ff_add_format
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:420
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
is_planar_yuv
static int is_planar_yuv(const AVPixFmtDescriptor *desc)
Definition: vf_swapuv.c:64
ff_vf_swapuv
const AVFilter ff_vf_swapuv
Definition: vf_swapuv.c:112
internal.h
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#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:130
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AV_PIX_FMT_FLAG_BE
#define AV_PIX_FMT_FLAG_BE
Pixel format is big-endian.
Definition: pixdesc.h:116
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
AVFilter
Filter definition.
Definition: avfilter.h:149
version.h
ret
ret
Definition: filter_design.txt:187
FFSWAP
#define FFSWAP(type, a, b)
Definition: macros.h:52
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
SwapUVContext
Definition: vf_swapuv.c:34
filter_frame
static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
Definition: vf_swapuv.c:58
avfilter.h
AV_PIX_FMT_FLAG_PLANAR
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
Definition: pixdesc.h:132
AVFilterContext
An instance of a filter.
Definition: avfilter.h:386
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
swapuv_options
static const AVOption swapuv_options[]
Definition: vf_swapuv.c:38
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:192
h
h
Definition: vp9dsp_template.c:2038