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path: root/libavfilter/vf_format.c (plain)
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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
38typedef 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 */
46 enum AVPixelFormat *formats;
47} FormatContext;
48
49static av_cold void uninit(AVFilterContext *ctx)
50{
51 FormatContext *s = ctx->priv;
52 av_freep(&s->formats);
53}
54
55static 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))) {
110 enum AVPixelFormat pix_fmt = av_pix_fmt_desc_get_id(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
129static int query_formats(AVFilterContext *ctx)
130{
131 FormatContext *s = ctx->priv;
132 AVFilterFormats *formats = ff_make_format_list(s->formats);
133
134 if (!formats)
135 return AVERROR(ENOMEM);
136
137 return ff_set_common_formats(ctx, formats);
138}
139
140
141#define OFFSET(x) offsetof(FormatContext, x)
142static const AVOption options[] = {
143 { "pix_fmts", "A '|'-separated list of pixel formats", OFFSET(pix_fmts), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM },
144 { NULL }
145};
146
147#if CONFIG_FORMAT_FILTER
148
149#define format_options options
150AVFILTER_DEFINE_CLASS(format);
151
152static const AVFilterPad avfilter_vf_format_inputs[] = {
153 {
154 .name = "default",
155 .type = AVMEDIA_TYPE_VIDEO,
156 .get_video_buffer = ff_null_get_video_buffer,
157 },
158 { NULL }
159};
160
161static const AVFilterPad avfilter_vf_format_outputs[] = {
162 {
163 .name = "default",
164 .type = AVMEDIA_TYPE_VIDEO
165 },
166 { NULL }
167};
168
169AVFilter ff_vf_format = {
170 .name = "format",
171 .description = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),
172
173 .init = init,
174 .uninit = uninit,
175
176 .query_formats = query_formats,
177
178 .priv_size = sizeof(FormatContext),
179 .priv_class = &format_class,
180
181 .inputs = avfilter_vf_format_inputs,
182 .outputs = avfilter_vf_format_outputs,
183};
184#endif /* CONFIG_FORMAT_FILTER */
185
186#if CONFIG_NOFORMAT_FILTER
187
188#define noformat_options options
189AVFILTER_DEFINE_CLASS(noformat);
190
191static const AVFilterPad avfilter_vf_noformat_inputs[] = {
192 {
193 .name = "default",
194 .type = AVMEDIA_TYPE_VIDEO,
195 .get_video_buffer = ff_null_get_video_buffer,
196 },
197 { NULL }
198};
199
200static const AVFilterPad avfilter_vf_noformat_outputs[] = {
201 {
202 .name = "default",
203 .type = AVMEDIA_TYPE_VIDEO
204 },
205 { NULL }
206};
207
208AVFilter ff_vf_noformat = {
209 .name = "noformat",
210 .description = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),
211
212 .init = init,
213 .uninit = uninit,
214
215 .query_formats = query_formats,
216
217 .priv_size = sizeof(FormatContext),
218 .priv_class = &noformat_class,
219
220 .inputs = avfilter_vf_noformat_inputs,
221 .outputs = avfilter_vf_noformat_outputs,
222};
223#endif /* CONFIG_NOFORMAT_FILTER */
224
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