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  av_log(ctx, AV_LOG_ERROR, "Empty output format string.\n");
65  return AVERROR(EINVAL);
66  }
67 
68  /* count the formats */
69  cur = s->pix_fmts;
70  while ((cur = strchr(cur, '|'))) {
71  nb_formats++;
72  if (*cur)
73  cur++;
74  }
75 
76  s->formats = av_malloc_array(nb_formats + 1, sizeof(*s->formats));
77  if (!s->formats)
78  return AVERROR(ENOMEM);
79 
80  /* parse the list of formats */
81  cur = s->pix_fmts;
82  for (i = 0; i < nb_formats; i++) {
83  sep = strchr(cur, '|');
84  if (sep)
85  *sep++ = 0;
86 
87  if ((ret = ff_parse_pixel_format(&s->formats[i], cur, ctx)) < 0)
88  return ret;
89 
90  cur = sep;
91  }
92  s->formats[nb_formats] = AV_PIX_FMT_NONE;
93 
94  if (!strcmp(ctx->filter->name, "noformat")) {
95  const AVPixFmtDescriptor *desc = NULL;
96  enum AVPixelFormat *formats_allowed;
97  int nb_formats_lavu = 0, nb_formats_allowed = 0;
98 
99  /* count the formats known to lavu */
100  while ((desc = av_pix_fmt_desc_next(desc)))
101  nb_formats_lavu++;
102 
103  formats_allowed = av_malloc_array(nb_formats_lavu + 1, sizeof(*formats_allowed));
104  if (!formats_allowed)
105  return AVERROR(ENOMEM);
106 
107  /* for each format known to lavu, check if it's in the list of
108  * forbidden formats */
109  while ((desc = av_pix_fmt_desc_next(desc))) {
111 
112  for (i = 0; i < nb_formats; i++) {
113  if (s->formats[i] == pix_fmt)
114  break;
115  }
116  if (i < nb_formats)
117  continue;
118 
119  formats_allowed[nb_formats_allowed++] = pix_fmt;
120  }
121  formats_allowed[nb_formats_allowed] = AV_PIX_FMT_NONE;
122  av_freep(&s->formats);
123  s->formats = formats_allowed;
124  }
125 
126  return 0;
127 }
128 
130 {
131  FormatContext *s = ctx->priv;
133 
134  if (!formats)
135  return AVERROR(ENOMEM);
136 
137  ff_set_common_formats(ctx, formats);
138  return 0;
139 }
140 
141 
142 #define OFFSET(x) offsetof(FormatContext, x)
143 static const AVOption options[] = {
144  { "pix_fmts", "A '|'-separated list of pixel formats", OFFSET(pix_fmts), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM },
145  { NULL }
146 };
147 
148 #if CONFIG_FORMAT_FILTER
149 
150 #define format_options options
151 AVFILTER_DEFINE_CLASS(format);
152 
153 static const AVFilterPad avfilter_vf_format_inputs[] = {
154  {
155  .name = "default",
156  .type = AVMEDIA_TYPE_VIDEO,
157  .get_video_buffer = ff_null_get_video_buffer,
158  },
159  { NULL }
160 };
161 
162 static const AVFilterPad avfilter_vf_format_outputs[] = {
163  {
164  .name = "default",
165  .type = AVMEDIA_TYPE_VIDEO
166  },
167  { NULL }
168 };
169 
170 AVFilter ff_vf_format = {
171  .name = "format",
172  .description = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),
173 
174  .init = init,
175  .uninit = uninit,
176 
177  .query_formats = query_formats,
178 
179  .priv_size = sizeof(FormatContext),
180  .priv_class = &format_class,
181 
182  .inputs = avfilter_vf_format_inputs,
183  .outputs = avfilter_vf_format_outputs,
184 };
185 #endif /* CONFIG_FORMAT_FILTER */
186 
187 #if CONFIG_NOFORMAT_FILTER
188 
189 #define noformat_options options
190 AVFILTER_DEFINE_CLASS(noformat);
191 
192 static const AVFilterPad avfilter_vf_noformat_inputs[] = {
193  {
194  .name = "default",
195  .type = AVMEDIA_TYPE_VIDEO,
196  .get_video_buffer = ff_null_get_video_buffer,
197  },
198  { NULL }
199 };
200 
201 static const AVFilterPad avfilter_vf_noformat_outputs[] = {
202  {
203  .name = "default",
204  .type = AVMEDIA_TYPE_VIDEO
205  },
206  { NULL }
207 };
208 
209 AVFilter ff_vf_noformat = {
210  .name = "noformat",
211  .description = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),
212 
213  .init = init,
214  .uninit = uninit,
215 
216  .query_formats = query_formats,
217 
218  .priv_size = sizeof(FormatContext),
219  .priv_class = &noformat_class,
220 
221  .inputs = avfilter_vf_noformat_inputs,
222  .outputs = avfilter_vf_noformat_outputs,
223 };
224 #endif /* CONFIG_NOFORMAT_FILTER */