FFmpeg
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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 FormatContext {
39  const AVClass *class;
40  char *pix_fmts;
41 
42  /**
43  * pix_fmts parsed into AVPixelFormats and terminated with
44  * AV_PIX_FMT_NONE
45  */
48 
49 static av_cold void uninit(AVFilterContext *ctx)
50 {
51  FormatContext *s = ctx->priv;
52  av_freep(&s->formats);
53 }
54 
55 static av_cold int init(AVFilterContext *ctx)
56 {
57  FormatContext *s = ctx->priv;
58  char *cur, *sep;
59  int nb_formats = 1;
60  int i;
61  int ret;
62 
63  if (!s->pix_fmts)
64  return AVERROR(EINVAL);
65 
66  /* count the formats */
67  cur = s->pix_fmts;
68  while ((cur = strchr(cur, '|'))) {
69  nb_formats++;
70  if (*cur)
71  cur++;
72  }
73 
74  s->formats = av_malloc_array(nb_formats + 1, sizeof(*s->formats));
75  if (!s->formats)
76  return AVERROR(ENOMEM);
77 
78  /* parse the list of formats */
79  cur = s->pix_fmts;
80  for (i = 0; i < nb_formats; i++) {
81  sep = strchr(cur, '|');
82  if (sep)
83  *sep++ = 0;
84 
85  if ((ret = ff_parse_pixel_format(&s->formats[i], cur, ctx)) < 0)
86  return ret;
87 
88  cur = sep;
89  }
90  s->formats[nb_formats] = AV_PIX_FMT_NONE;
91 
92  if (!strcmp(ctx->filter->name, "noformat")) {
93  const AVPixFmtDescriptor *desc = NULL;
94  enum AVPixelFormat *formats_allowed;
95  int nb_formats_lavu = 0, nb_formats_allowed = 0;
96 
97  /* count the formats known to lavu */
98  while ((desc = av_pix_fmt_desc_next(desc)))
99  nb_formats_lavu++;
100 
101  formats_allowed = av_malloc_array(nb_formats_lavu + 1, sizeof(*formats_allowed));
102  if (!formats_allowed)
103  return AVERROR(ENOMEM);
104 
105  /* for each format known to lavu, check if it's in the list of
106  * forbidden formats */
107  while ((desc = av_pix_fmt_desc_next(desc))) {
109 
110  for (i = 0; i < nb_formats; i++) {
111  if (s->formats[i] == pix_fmt)
112  break;
113  }
114  if (i < nb_formats)
115  continue;
116 
117  formats_allowed[nb_formats_allowed++] = pix_fmt;
118  }
119  formats_allowed[nb_formats_allowed] = AV_PIX_FMT_NONE;
120  av_freep(&s->formats);
121  s->formats = formats_allowed;
122  }
123 
124  return 0;
125 }
126 
128 {
129  FormatContext *s = ctx->priv;
131 
132  if (!formats)
133  return AVERROR(ENOMEM);
134 
135  ff_set_common_formats(ctx, formats);
136  return 0;
137 }
138 
139 
140 #define OFFSET(x) offsetof(FormatContext, x)
141 static const AVOption options[] = {
142  { "pix_fmts", "A '|'-separated list of pixel formats", OFFSET(pix_fmts), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM },
143  { NULL }
144 };
145 
146 #if CONFIG_FORMAT_FILTER
147 
148 #define format_options options
149 AVFILTER_DEFINE_CLASS(format);
150 
151 static const AVFilterPad avfilter_vf_format_inputs[] = {
152  {
153  .name = "default",
154  .type = AVMEDIA_TYPE_VIDEO,
155  .get_video_buffer = ff_null_get_video_buffer,
156  },
157  { NULL }
158 };
159 
160 static const AVFilterPad avfilter_vf_format_outputs[] = {
161  {
162  .name = "default",
163  .type = AVMEDIA_TYPE_VIDEO
164  },
165  { NULL }
166 };
167 
168 AVFilter ff_vf_format = {
169  .name = "format",
170  .description = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),
171 
172  .init = init,
173  .uninit = uninit,
174 
175  .query_formats = query_formats,
176 
177  .priv_size = sizeof(FormatContext),
178  .priv_class = &format_class,
179 
180  .inputs = avfilter_vf_format_inputs,
181  .outputs = avfilter_vf_format_outputs,
182 };
183 #endif /* CONFIG_FORMAT_FILTER */
184 
185 #if CONFIG_NOFORMAT_FILTER
186 
187 #define noformat_options options
188 AVFILTER_DEFINE_CLASS(noformat);
189 
190 static const AVFilterPad avfilter_vf_noformat_inputs[] = {
191  {
192  .name = "default",
193  .type = AVMEDIA_TYPE_VIDEO,
194  .get_video_buffer = ff_null_get_video_buffer,
195  },
196  { NULL }
197 };
198 
199 static const AVFilterPad avfilter_vf_noformat_outputs[] = {
200  {
201  .name = "default",
202  .type = AVMEDIA_TYPE_VIDEO
203  },
204  { NULL }
205 };
206 
207 AVFilter ff_vf_noformat = {
208  .name = "noformat",
209  .description = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),
210 
211  .init = init,
212  .uninit = uninit,
213 
214  .query_formats = query_formats,
215 
216  .priv_size = sizeof(FormatContext),
217  .priv_class = &noformat_class,
218 
219  .inputs = avfilter_vf_noformat_inputs,
220  .outputs = avfilter_vf_noformat_outputs,
221 };
222 #endif /* CONFIG_NOFORMAT_FILTER */