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 #if FF_API_ERROR_FRAME
52  FFSWAP(uint64_t, frame->error[1], frame->error[2]);
54 #endif
55 }
56 
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:2522
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVOption.
Definition: opt.h:246
static int query_formats(AVFilterContext *ctx)
Definition: vf_swapuv.c:88
const char * fmt
Definition: avisynth_c.h:861
Main libavfilter public API header.
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:486
const char * desc
Definition: nvenc.c:68
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:1093
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:177
AVOptions.
attribute_deprecated uint64_t error[AV_NUM_DATA_POINTERS]
Definition: frame.h:430
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
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
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:569
#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:336
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
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
static void do_swap(AVFrame *frame)
Definition: vf_swapuv.c:44
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:326
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
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 inputs
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
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
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
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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:309
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