2 * Copyright (c) 2007 Bobby Bingham
4 * This file is part of FFmpeg.
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.
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.
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
23 * format and noformat video filters
28 #include "libavutil/internal.h"
29 #include "libavutil/mem.h"
30 #include "libavutil/pixdesc.h"
31 #include "libavutil/opt.h"
42 * List of flags telling if a given image format has been listed
43 * as argument to the filter.
45 int listed_pix_fmt_flags[AV_PIX_FMT_NB];
48 #define AV_PIX_FMT_NAME_MAXSIZE 32
50 static av_cold int init(AVFilterContext *ctx)
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;
56 enum AVPixelFormat pix_fmt;
59 return AVERROR(EINVAL);
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);
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");
72 memcpy(pix_fmt_name, cur, pix_fmt_name_len);
73 pix_fmt_name[pix_fmt_name_len] = 0;
75 if ((ret = ff_parse_pixel_format(&pix_fmt, pix_fmt_name, ctx)) < 0)
78 s->listed_pix_fmt_flags[pix_fmt] = 1;
84 static AVFilterFormats *make_format_list(FormatContext *s, int flag)
86 AVFilterFormats *formats = NULL;
87 enum AVPixelFormat pix_fmt;
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);
93 ff_formats_unref(&formats);
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 },
107 #if CONFIG_FORMAT_FILTER
108 static int query_formats_format(AVFilterContext *ctx)
110 ff_set_common_formats(ctx, make_format_list(ctx->priv, 1));
114 #define format_options options
115 AVFILTER_DEFINE_CLASS(format);
117 static const AVFilterPad avfilter_vf_format_inputs[] = {
120 .type = AVMEDIA_TYPE_VIDEO,
121 .get_video_buffer = ff_null_get_video_buffer,
126 static const AVFilterPad avfilter_vf_format_outputs[] = {
129 .type = AVMEDIA_TYPE_VIDEO
134 AVFilter ff_vf_format = {
136 .description = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),
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,
144 #endif /* CONFIG_FORMAT_FILTER */
146 #if CONFIG_NOFORMAT_FILTER
147 static int query_formats_noformat(AVFilterContext *ctx)
149 ff_set_common_formats(ctx, make_format_list(ctx->priv, 0));
153 #define noformat_options options
154 AVFILTER_DEFINE_CLASS(noformat);
156 static const AVFilterPad avfilter_vf_noformat_inputs[] = {
159 .type = AVMEDIA_TYPE_VIDEO,
160 .get_video_buffer = ff_null_get_video_buffer,
165 static const AVFilterPad avfilter_vf_noformat_outputs[] = {
168 .type = AVMEDIA_TYPE_VIDEO
173 AVFilter ff_vf_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."),
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,
183 #endif /* CONFIG_NOFORMAT_FILTER */