More accurate value for log2(10)
[libav.git] / libavfilter / vf_format.c
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 libavfilter/vf_format.c
23 * format and noformat video filters
24 */
25
26 #include "libavutil/pixdesc.h"
27 #include "avfilter.h"
28
29 typedef struct {
30 /**
31 * List of flags telling if a given image format has been listed
32 * as argument to the filter.
33 */
34 int listed_pix_fmt_flags[PIX_FMT_NB];
35 } FormatContext;
36
37 #define PIX_FMT_NAME_MAXSIZE 32
38
39 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
40 {
41 FormatContext *format = ctx->priv;
42 const char *cur, *sep;
43 char pix_fmt_name[PIX_FMT_NAME_MAXSIZE];
44 int pix_fmt_name_len;
45 enum PixelFormat pix_fmt;
46
47 /* parse the list of formats */
48 for (cur = args; cur; cur = sep ? sep+1 : NULL) {
49 if (!(sep = strchr(cur, ':')))
50 pix_fmt_name_len = strlen(cur);
51 else
52 pix_fmt_name_len = sep - cur;
53 if (pix_fmt_name_len >= PIX_FMT_NAME_MAXSIZE) {
54 av_log(ctx, AV_LOG_ERROR, "Format name too long\n");
55 return -1;
56 }
57
58 memcpy(pix_fmt_name, cur, pix_fmt_name_len);
59 pix_fmt_name[pix_fmt_name_len] = 0;
60 pix_fmt = av_get_pix_fmt(pix_fmt_name);
61
62 if (pix_fmt == PIX_FMT_NONE) {
63 av_log(ctx, AV_LOG_ERROR, "Unknown pixel format: %s\n", pix_fmt_name);
64 return -1;
65 }
66
67 format->listed_pix_fmt_flags[pix_fmt] = 1;
68 }
69
70 return 0;
71 }
72
73 static AVFilterFormats *make_format_list(FormatContext *format, int flag)
74 {
75 AVFilterFormats *formats;
76 enum PixelFormat pix_fmt;
77
78 formats = av_mallocz(sizeof(AVFilterFormats));
79 formats->formats = av_malloc(sizeof(enum PixelFormat) * PIX_FMT_NB);
80
81 for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
82 if (format->listed_pix_fmt_flags[pix_fmt] == flag)
83 formats->formats[formats->format_count++] = pix_fmt;
84
85 return formats;
86 }
87
88 static int query_formats_format(AVFilterContext *ctx)
89 {
90 avfilter_set_common_formats(ctx, make_format_list(ctx->priv, 1));
91 return 0;
92 }
93
94 static int query_formats_noformat(AVFilterContext *ctx)
95 {
96 avfilter_set_common_formats(ctx, make_format_list(ctx->priv, 0));
97 return 0;
98 }
99
100 static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms,
101 int w, int h)
102 {
103 return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
104 }
105
106 static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
107 {
108 avfilter_start_frame(link->dst->outputs[0], picref);
109 }
110
111 static void end_frame(AVFilterLink *link)
112 {
113 avfilter_end_frame(link->dst->outputs[0]);
114 }
115
116 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
117 {
118 avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
119 }
120
121 AVFilter avfilter_vf_format = {
122 .name = "format",
123 .description = "Convert the input video to one of the specified pixel formats.",
124
125 .init = init,
126
127 .query_formats = query_formats_format,
128
129 .priv_size = sizeof(FormatContext),
130
131 .inputs = (AVFilterPad[]) {{ .name = "default",
132 .type = CODEC_TYPE_VIDEO,
133 .get_video_buffer= get_video_buffer,
134 .start_frame = start_frame,
135 .draw_slice = draw_slice,
136 .end_frame = end_frame, },
137 { .name = NULL}},
138 .outputs = (AVFilterPad[]) {{ .name = "default",
139 .type = CODEC_TYPE_VIDEO },
140 { .name = NULL}},
141 };
142
143 AVFilter avfilter_vf_noformat = {
144 .name = "noformat",
145 .description = "Force libavfilter not to use any of the specified pixel formats for the input to the next filter.",
146
147 .init = init,
148
149 .query_formats = query_formats_noformat,
150
151 .priv_size = sizeof(FormatContext),
152
153 .inputs = (AVFilterPad[]) {{ .name = "default",
154 .type = CODEC_TYPE_VIDEO,
155 .get_video_buffer= get_video_buffer,
156 .start_frame = start_frame,
157 .draw_slice = draw_slice,
158 .end_frame = end_frame, },
159 { .name = NULL}},
160 .outputs = (AVFilterPad[]) {{ .name = "default",
161 .type = CODEC_TYPE_VIDEO },
162 { .name = NULL}},
163 };