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/common.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/parseutils.h"
37 static av_cold int init(AVFilterContext *ctx, const char *args)
39 AspectContext *aspect = ctx->priv;
40 aspect->ratio = (AVRational) {0, 1};
43 if (av_parse_ratio(&aspect->ratio, args, 100, 0, ctx) < 0 ||
44 aspect->ratio.num < 0 || aspect->ratio.den <= 0) {
45 av_log(ctx, AV_LOG_ERROR,
46 "Invalid string '%s' for aspect ratio.\n", args);
47 return AVERROR(EINVAL);
51 av_log(ctx, AV_LOG_VERBOSE, "a:%d/%d\n", aspect->ratio.num, aspect->ratio.den);
55 static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
57 AspectContext *aspect = link->dst->priv;
59 picref->video->sample_aspect_ratio = aspect->ratio;
61 return ff_start_frame(link->dst->outputs[0], picref);
64 #if CONFIG_SETDAR_FILTER
65 static int setdar_config_props(AVFilterLink *inlink)
67 AspectContext *aspect = inlink->dst->priv;
68 AVRational dar = aspect->ratio;
70 av_reduce(&aspect->ratio.num, &aspect->ratio.den,
71 aspect->ratio.num * inlink->h,
72 aspect->ratio.den * inlink->w, 100);
74 av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d -> dar:%d/%d sar:%d/%d\n",
75 inlink->w, inlink->h, dar.num, dar.den, aspect->ratio.num, aspect->ratio.den);
77 inlink->sample_aspect_ratio = aspect->ratio;
82 static const AVFilterPad avfilter_vf_setdar_inputs[] = {
85 .type = AVMEDIA_TYPE_VIDEO,
86 .config_props = setdar_config_props,
87 .get_video_buffer = ff_null_get_video_buffer,
88 .start_frame = start_frame,
89 .end_frame = ff_null_end_frame
94 static const AVFilterPad avfilter_vf_setdar_outputs[] = {
97 .type = AVMEDIA_TYPE_VIDEO,
102 AVFilter avfilter_vf_setdar = {
104 .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
108 .priv_size = sizeof(AspectContext),
110 .inputs = avfilter_vf_setdar_inputs,
112 .outputs = avfilter_vf_setdar_outputs,
114 #endif /* CONFIG_SETDAR_FILTER */
116 #if CONFIG_SETSAR_FILTER
117 static int setsar_config_props(AVFilterLink *inlink)
119 AspectContext *aspect = inlink->dst->priv;
121 inlink->sample_aspect_ratio = aspect->ratio;
126 static const AVFilterPad avfilter_vf_setsar_inputs[] = {
129 .type = AVMEDIA_TYPE_VIDEO,
130 .config_props = setsar_config_props,
131 .get_video_buffer = ff_null_get_video_buffer,
132 .start_frame = start_frame,
133 .end_frame = ff_null_end_frame
138 static const AVFilterPad avfilter_vf_setsar_outputs[] = {
141 .type = AVMEDIA_TYPE_VIDEO,
146 AVFilter avfilter_vf_setsar = {
148 .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
152 .priv_size = sizeof(AspectContext),
154 .inputs = avfilter_vf_setsar_inputs,
156 .outputs = avfilter_vf_setsar_outputs,
158 #endif /* CONFIG_SETSAR_FILTER */