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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/pixdesc.h"
27 #include "avfilter.h"
28 #include "formats.h"
29 #include "internal.h"
30 #include "video.h"
31 
32 static void do_swap(AVFrame *frame)
33 {
34  FFSWAP(uint8_t*, frame->data[1], frame->data[2]);
35  FFSWAP(int, frame->linesize[1], frame->linesize[2]);
36  FFSWAP(uint64_t, frame->error[1], frame->error[2]);
37  FFSWAP(AVBufferRef*, frame->buf[1], frame->buf[2]);
38 }
39 
40 static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
41 {
42  AVFrame *picref = ff_default_get_video_buffer(link, w, h);
43  do_swap(picref);
44  return picref;
45 }
46 
47 static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
48 {
49  do_swap(inpicref);
50  return ff_filter_frame(link->dst->outputs[0], inpicref);
51 }
52 
53 static int is_planar_yuv(const AVPixFmtDescriptor *desc)
54 {
55  int i;
56 
58  desc->nb_components < 3 ||
59  (desc->comp[1].depth_minus1 != desc->comp[2].depth_minus1))
60  return 0;
61  for (i = 0; i < desc->nb_components; i++) {
62  if (desc->comp[i].offset_plus1 != 1 ||
63  desc->comp[i].shift != 0 ||
64  desc->comp[i].plane != i)
65  return 0;
66  }
67 
68  return 1;
69 }
70 
72 {
74  int fmt;
75 
76  for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
77  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
78  if (is_planar_yuv(desc))
79  ff_add_format(&formats, fmt);
80  }
81 
82  ff_set_common_formats(ctx, formats);
83  return 0;
84 }
85 
86 static const AVFilterPad swapuv_inputs[] = {
87  {
88  .name = "default",
89  .type = AVMEDIA_TYPE_VIDEO,
90  .get_video_buffer = get_video_buffer,
91  .filter_frame = filter_frame,
92  },
93  { NULL }
94 };
95 
96 static const AVFilterPad swapuv_outputs[] = {
97  {
98  .name = "default",
99  .type = AVMEDIA_TYPE_VIDEO,
100  },
101  { NULL }
102 };
103 
105  .name = "swapuv",
106  .description = NULL_IF_CONFIG_SMALL("Swap U and V components."),
107  .query_formats = query_formats,
108  .inputs = swapuv_inputs,
109  .outputs = swapuv_outputs,
110 };