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"
35 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
37 AspectContext *aspect = ctx->priv;
38 aspect->ratio = (AVRational) {0, 1};
41 if (av_parse_ratio(&aspect->ratio, args, 100, 0, ctx) < 0 ||
42 aspect->ratio.num < 0 || aspect->ratio.den <= 0) {
43 av_log(ctx, AV_LOG_ERROR,
44 "Invalid string '%s' for aspect ratio.\n", args);
45 return AVERROR(EINVAL);
49 av_log(ctx, AV_LOG_INFO, "a:%d/%d\n", aspect->ratio.num, aspect->ratio.den);
53 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
55 AspectContext *aspect = link->dst->priv;
57 picref->video->sample_aspect_ratio = aspect->ratio;
58 avfilter_start_frame(link->dst->outputs[0], picref);
61 #if CONFIG_SETDAR_FILTER
62 static int setdar_config_props(AVFilterLink *inlink)
64 AspectContext *aspect = inlink->dst->priv;
65 AVRational dar = aspect->ratio;
67 av_reduce(&aspect->ratio.num, &aspect->ratio.den,
68 aspect->ratio.num * inlink->h,
69 aspect->ratio.den * inlink->w, 100);
71 av_log(inlink->dst, AV_LOG_INFO, "w:%d h:%d -> dar:%d/%d sar:%d/%d\n",
72 inlink->w, inlink->h, dar.num, dar.den, aspect->ratio.num, aspect->ratio.den);
74 inlink->sample_aspect_ratio = aspect->ratio;
79 AVFilter avfilter_vf_setdar = {
81 .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
85 .priv_size = sizeof(AspectContext),
87 .inputs = (const AVFilterPad[]) {{ .name = "default",
88 .type = AVMEDIA_TYPE_VIDEO,
89 .config_props = setdar_config_props,
90 .get_video_buffer = ff_null_get_video_buffer,
91 .start_frame = start_frame,
92 .end_frame = ff_null_end_frame },
95 .outputs = (const AVFilterPad[]) {{ .name = "default",
96 .type = AVMEDIA_TYPE_VIDEO, },
99 #endif /* CONFIG_SETDAR_FILTER */
101 #if CONFIG_SETSAR_FILTER
102 static int setsar_config_props(AVFilterLink *inlink)
104 AspectContext *aspect = inlink->dst->priv;
106 inlink->sample_aspect_ratio = aspect->ratio;
111 AVFilter avfilter_vf_setsar = {
113 .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
117 .priv_size = sizeof(AspectContext),
119 .inputs = (const AVFilterPad[]) {{ .name = "default",
120 .type = AVMEDIA_TYPE_VIDEO,
121 .config_props = setsar_config_props,
122 .get_video_buffer = ff_null_get_video_buffer,
123 .start_frame = start_frame,
124 .end_frame = ff_null_end_frame },
127 .outputs = (const AVFilterPad[]) {{ .name = "default",
128 .type = AVMEDIA_TYPE_VIDEO, },
131 #endif /* CONFIG_SETSAR_FILTER */