2 * Copyright (c) 2007 Bobby Bingham
4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; 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"
38 * List of flags telling if a given image format has been listed
39 * as argument to the filter.
41 int listed_pix_fmt_flags[PIX_FMT_NB];
44 #define PIX_FMT_NAME_MAXSIZE 32
46 static av_cold int init(AVFilterContext *ctx, const char *args)
48 FormatContext *format = ctx->priv;
49 const char *cur, *sep;
50 char pix_fmt_name[PIX_FMT_NAME_MAXSIZE];
52 enum PixelFormat pix_fmt;
54 /* parse the list of formats */
55 for (cur = args; cur; cur = sep ? sep+1 : NULL) {
56 if (!(sep = strchr(cur, ':')))
57 pix_fmt_name_len = strlen(cur);
59 pix_fmt_name_len = sep - cur;
60 if (pix_fmt_name_len >= PIX_FMT_NAME_MAXSIZE) {
61 av_log(ctx, AV_LOG_ERROR, "Format name too long\n");
65 memcpy(pix_fmt_name, cur, pix_fmt_name_len);
66 pix_fmt_name[pix_fmt_name_len] = 0;
67 pix_fmt = av_get_pix_fmt(pix_fmt_name);
69 if (pix_fmt == PIX_FMT_NONE) {
70 av_log(ctx, AV_LOG_ERROR, "Unknown pixel format: %s\n", pix_fmt_name);
74 format->listed_pix_fmt_flags[pix_fmt] = 1;
80 static AVFilterFormats *make_format_list(FormatContext *format, int flag)
82 AVFilterFormats *formats;
83 enum PixelFormat pix_fmt;
85 formats = av_mallocz(sizeof(AVFilterFormats));
86 formats->formats = av_malloc(sizeof(enum PixelFormat) * PIX_FMT_NB);
88 for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
89 if (format->listed_pix_fmt_flags[pix_fmt] == flag)
90 formats->formats[formats->format_count++] = pix_fmt;
95 #if CONFIG_FORMAT_FILTER
96 static int query_formats_format(AVFilterContext *ctx)
98 ff_set_common_formats(ctx, make_format_list(ctx->priv, 1));
102 AVFilter avfilter_vf_format = {
104 .description = NULL_IF_CONFIG_SMALL("Convert the input video to one of the specified pixel formats."),
108 .query_formats = query_formats_format,
110 .priv_size = sizeof(FormatContext),
112 .inputs = (const AVFilterPad[]) {{ .name = "default",
113 .type = AVMEDIA_TYPE_VIDEO,
114 .get_video_buffer= ff_null_get_video_buffer,
115 .start_frame = ff_null_start_frame,
116 .draw_slice = ff_null_draw_slice,
117 .end_frame = ff_null_end_frame, },
119 .outputs = (const AVFilterPad[]) {{ .name = "default",
120 .type = AVMEDIA_TYPE_VIDEO },
123 #endif /* CONFIG_FORMAT_FILTER */
125 #if CONFIG_NOFORMAT_FILTER
126 static int query_formats_noformat(AVFilterContext *ctx)
128 ff_set_common_formats(ctx, make_format_list(ctx->priv, 0));
132 AVFilter avfilter_vf_noformat = {
134 .description = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),
138 .query_formats = query_formats_noformat,
140 .priv_size = sizeof(FormatContext),
142 .inputs = (const AVFilterPad[]) {{ .name = "default",
143 .type = AVMEDIA_TYPE_VIDEO,
144 .get_video_buffer= ff_null_get_video_buffer,
145 .start_frame = ff_null_start_frame,
146 .draw_slice = ff_null_draw_slice,
147 .end_frame = ff_null_end_frame, },
149 .outputs = (const AVFilterPad[]) {{ .name = "default",
150 .type = AVMEDIA_TYPE_VIDEO },
153 #endif /* CONFIG_NOFORMAT_FILTER */