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