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vf_format.c
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1 /*
2  * Copyright (c) 2007 Bobby Bingham
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  * format and noformat video filters
24  */
25 
26 #include <string.h>
27 
28 #include "libavutil/internal.h"
29 #include "libavutil/mem.h"
30 #include "libavutil/pixdesc.h"
31 #include "libavutil/opt.h"
32 
33 #include "avfilter.h"
34 #include "formats.h"
35 #include "internal.h"
36 #include "video.h"
37 
38 typedef struct {
39  const AVClass *class;
40  char *pix_fmts;
41  /**
42  * List of flags telling if a given image format has been listed
43  * as argument to the filter.
44  */
45  int listed_pix_fmt_flags[AV_PIX_FMT_NB];
47 
48 #define AV_PIX_FMT_NAME_MAXSIZE 32
49 
50 static av_cold int init(AVFilterContext *ctx)
51 {
52  FormatContext *s = ctx->priv;
53  const char *cur, *sep;
54  char pix_fmt_name[AV_PIX_FMT_NAME_MAXSIZE];
55  int pix_fmt_name_len, ret;
57 
58  if (!s->pix_fmts)
59  return AVERROR(EINVAL);
60 
61  /* parse the list of formats */
62  for (cur = s->pix_fmts; cur; cur = sep ? sep + 1 : NULL) {
63  if (!(sep = strchr(cur, '|')))
64  pix_fmt_name_len = strlen(cur);
65  else
66  pix_fmt_name_len = sep - cur;
67  if (pix_fmt_name_len >= AV_PIX_FMT_NAME_MAXSIZE) {
68  av_log(ctx, AV_LOG_ERROR, "Format name too long\n");
69  return -1;
70  }
71 
72  memcpy(pix_fmt_name, cur, pix_fmt_name_len);
73  pix_fmt_name[pix_fmt_name_len] = 0;
74 
75  if ((ret = ff_parse_pixel_format(&pix_fmt, pix_fmt_name, ctx)) < 0)
76  return ret;
77 
79  }
80 
81  return 0;
82 }
83 
85 {
86  AVFilterFormats *formats = NULL;
88 
89  for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
90  if (s->listed_pix_fmt_flags[pix_fmt] == flag) {
91  int ret = ff_add_format(&formats, pix_fmt);
92  if (ret < 0) {
93  ff_formats_unref(&formats);
94  return NULL;
95  }
96  }
97 
98  return formats;
99 }
100 
101 #define OFFSET(x) offsetof(FormatContext, x)
102 static const AVOption options[] = {
103  { "pix_fmts", "A '|'-separated list of pixel formats", OFFSET(pix_fmts), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM },
104  { NULL }
105 };
106 
107 #if CONFIG_FORMAT_FILTER
108 static int query_formats_format(AVFilterContext *ctx)
109 {
111  return 0;
112 }
113 
114 #define format_options options
115 AVFILTER_DEFINE_CLASS(format);
116 
117 static const AVFilterPad avfilter_vf_format_inputs[] = {
118  {
119  .name = "default",
120  .type = AVMEDIA_TYPE_VIDEO,
121  .get_video_buffer = ff_null_get_video_buffer,
122  },
123  { NULL }
124 };
125 
126 static const AVFilterPad avfilter_vf_format_outputs[] = {
127  {
128  .name = "default",
129  .type = AVMEDIA_TYPE_VIDEO
130  },
131  { NULL }
132 };
133 
134 AVFilter avfilter_vf_format = {
135  .name = "format",
136  .description = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),
137  .init = init,
138  .query_formats = query_formats_format,
139  .priv_size = sizeof(FormatContext),
140  .priv_class = &format_class,
141  .inputs = avfilter_vf_format_inputs,
142  .outputs = avfilter_vf_format_outputs,
143 };
144 #endif /* CONFIG_FORMAT_FILTER */
145 
146 #if CONFIG_NOFORMAT_FILTER
147 static int query_formats_noformat(AVFilterContext *ctx)
148 {
150  return 0;
151 }
152 
153 #define noformat_options options
154 AVFILTER_DEFINE_CLASS(noformat);
155 
156 static const AVFilterPad avfilter_vf_noformat_inputs[] = {
157  {
158  .name = "default",
159  .type = AVMEDIA_TYPE_VIDEO,
160  .get_video_buffer = ff_null_get_video_buffer,
161  },
162  { NULL }
163 };
164 
165 static const AVFilterPad avfilter_vf_noformat_outputs[] = {
166  {
167  .name = "default",
168  .type = AVMEDIA_TYPE_VIDEO
169  },
170  { NULL }
171 };
172 
173 AVFilter avfilter_vf_noformat = {
174  .name = "noformat",
175  .description = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),
176  .init = init,
177  .query_formats = query_formats_noformat,
178  .priv_size = sizeof(FormatContext),
179  .priv_class = &noformat_class,
180  .inputs = avfilter_vf_noformat_inputs,
181  .outputs = avfilter_vf_noformat_outputs,
182 };
183 #endif /* CONFIG_NOFORMAT_FILTER */