2 * Copyright (c) 2010 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 * aspect ratio modification video filters
26 #include "libavutil/mathematics.h"
27 #include "libavutil/parseutils.h"
36 static av_cold int init(AVFilterContext *ctx, const char *args)
38 AspectContext *aspect = ctx->priv;
39 aspect->ratio = (AVRational) {0, 1};
42 if (av_parse_ratio(&aspect->ratio, args, 100, 0, ctx) < 0 ||
43 aspect->ratio.num < 0 || aspect->ratio.den <= 0) {
44 av_log(ctx, AV_LOG_ERROR,
45 "Invalid string '%s' for aspect ratio.\n", args);
46 return AVERROR(EINVAL);
50 av_log(ctx, AV_LOG_VERBOSE, "a:%d/%d\n", aspect->ratio.num, aspect->ratio.den);
54 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
56 AspectContext *aspect = link->dst->priv;
58 picref->video->sample_aspect_ratio = aspect->ratio;
59 ff_start_frame(link->dst->outputs[0], picref);
62 #if CONFIG_SETDAR_FILTER
63 static int setdar_config_props(AVFilterLink *inlink)
65 AspectContext *aspect = inlink->dst->priv;
66 AVRational dar = aspect->ratio;
68 av_reduce(&aspect->ratio.num, &aspect->ratio.den,
69 aspect->ratio.num * inlink->h,
70 aspect->ratio.den * inlink->w, 100);
72 av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d -> dar:%d/%d sar:%d/%d\n",
73 inlink->w, inlink->h, dar.num, dar.den, aspect->ratio.num, aspect->ratio.den);
75 inlink->sample_aspect_ratio = aspect->ratio;
80 AVFilter avfilter_vf_setdar = {
82 .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
86 .priv_size = sizeof(AspectContext),
88 .inputs = (const AVFilterPad[]) {{ .name = "default",
89 .type = AVMEDIA_TYPE_VIDEO,
90 .config_props = setdar_config_props,
91 .get_video_buffer = ff_null_get_video_buffer,
92 .start_frame = start_frame,
93 .end_frame = ff_null_end_frame },
96 .outputs = (const AVFilterPad[]) {{ .name = "default",
97 .type = AVMEDIA_TYPE_VIDEO, },
100 #endif /* CONFIG_SETDAR_FILTER */
102 #if CONFIG_SETSAR_FILTER
103 static int setsar_config_props(AVFilterLink *inlink)
105 AspectContext *aspect = inlink->dst->priv;
107 inlink->sample_aspect_ratio = aspect->ratio;
112 AVFilter avfilter_vf_setsar = {
114 .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
118 .priv_size = sizeof(AspectContext),
120 .inputs = (const AVFilterPad[]) {{ .name = "default",
121 .type = AVMEDIA_TYPE_VIDEO,
122 .config_props = setsar_config_props,
123 .get_video_buffer = ff_null_get_video_buffer,
124 .start_frame = start_frame,
125 .end_frame = ff_null_end_frame },
128 .outputs = (const AVFilterPad[]) {{ .name = "default",
129 .type = AVMEDIA_TYPE_VIDEO, },
132 #endif /* CONFIG_SETSAR_FILTER */