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
28 #include "libavutil/common.h"
29 #include "libavutil/eval.h"
30 #include "libavutil/mathematics.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/parseutils.h"
33 #include "libavutil/pixdesc.h"
39 static const char *const var_names[] = {
70 #if FF_API_OLD_FILTER_OPTS
76 static av_cold int init(AVFilterContext *ctx)
78 AspectContext *s = ctx->priv;
81 #if FF_API_OLD_FILTER_OPTS
82 if (s->ratio_expr && s->aspect_den > 0) {
84 av_log(ctx, AV_LOG_WARNING,
85 "num:den syntax is deprecated, please use num/den or named options instead\n");
86 ret = av_expr_parse_and_eval(&num, s->ratio_expr, NULL, NULL,
87 NULL, NULL, NULL, NULL, NULL, 0, ctx);
89 av_log(ctx, AV_LOG_ERROR, "Unable to parse ratio numerator \"%s\"\n", s->ratio_expr);
90 return AVERROR(EINVAL);
92 s->sar = s->dar = av_d2q(num / s->aspect_den, s->max);
99 static int filter_frame(AVFilterLink *link, AVFrame *frame)
101 AspectContext *s = link->dst->priv;
103 frame->sample_aspect_ratio = s->sar;
104 return ff_filter_frame(link->dst->outputs[0], frame);
107 #define OFFSET(x) offsetof(AspectContext, x)
108 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
110 static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h)
112 if (sar.num && sar.den) {
113 av_reduce(&dar->num, &dar->den, sar.num * w, sar.den * h, INT_MAX);
115 av_reduce(&dar->num, &dar->den, w, h, INT_MAX);
119 static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio)
121 AVFilterContext *ctx = inlink->dst;
122 AspectContext *s = inlink->dst->priv;
123 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
124 double var_values[VARS_NB], res;
127 var_values[VAR_PI] = M_PI;
128 var_values[VAR_PHI] = M_PHI;
129 var_values[VAR_E] = M_E;
130 var_values[VAR_W] = inlink->w;
131 var_values[VAR_H] = inlink->h;
132 var_values[VAR_A] = (double) inlink->w / inlink->h;
133 var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
134 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
135 var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
136 var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
137 var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
139 /* evaluate new aspect ratio*/
140 ret = av_expr_parse_and_eval(&res, s->ratio_expr,
141 var_names, var_values,
142 NULL, NULL, NULL, NULL, NULL, 0, ctx);
144 ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx);
146 *aspect_ratio = av_d2q(res, s->max);
149 av_log(ctx, AV_LOG_ERROR,
150 "Error when evaluating the expression '%s'\n", s->ratio_expr);
153 if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) {
154 av_log(ctx, AV_LOG_ERROR,
155 "Invalid string '%s' for aspect ratio\n", s->ratio_expr);
156 return AVERROR(EINVAL);
161 #if CONFIG_SETDAR_FILTER
163 static int setdar_config_props(AVFilterLink *inlink)
165 AspectContext *s = inlink->dst->priv;
168 AVRational old_sar = inlink->sample_aspect_ratio;
171 #if FF_API_OLD_FILTER_OPTS
172 if (!(s->ratio_expr && s->aspect_den > 0)) {
174 if ((ret = get_aspect_ratio(inlink, &s->dar)))
176 #if FF_API_OLD_FILTER_OPTS
180 if (s->dar.num && s->dar.den) {
181 av_reduce(&s->sar.num, &s->sar.den,
182 s->dar.num * inlink->h,
183 s->dar.den * inlink->w, INT_MAX);
184 inlink->sample_aspect_ratio = s->sar;
187 inlink->sample_aspect_ratio = (AVRational){ 1, 1 };
188 dar = (AVRational){ inlink->w, inlink->h };
191 compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
192 av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n",
193 inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den,
194 dar.num, dar.den, inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den);
199 static const AVOption setdar_options[] = {
200 { "dar", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
201 { "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
202 { "r", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
203 #if FF_API_OLD_FILTER_OPTS
204 { "dar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
206 { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
210 AVFILTER_DEFINE_CLASS(setdar);
212 static const AVFilterPad avfilter_vf_setdar_inputs[] = {
215 .type = AVMEDIA_TYPE_VIDEO,
216 .config_props = setdar_config_props,
217 .filter_frame = filter_frame,
222 static const AVFilterPad avfilter_vf_setdar_outputs[] = {
225 .type = AVMEDIA_TYPE_VIDEO,
230 AVFilter ff_vf_setdar = {
232 .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
234 .priv_size = sizeof(AspectContext),
235 .priv_class = &setdar_class,
236 .inputs = avfilter_vf_setdar_inputs,
237 .outputs = avfilter_vf_setdar_outputs,
240 #endif /* CONFIG_SETDAR_FILTER */
242 #if CONFIG_SETSAR_FILTER
244 static int setsar_config_props(AVFilterLink *inlink)
246 AspectContext *s = inlink->dst->priv;
247 AVRational old_sar = inlink->sample_aspect_ratio;
248 AVRational old_dar, dar;
251 #if FF_API_OLD_FILTER_OPTS
252 if (!(s->ratio_expr && s->aspect_den > 0)) {
254 if ((ret = get_aspect_ratio(inlink, &s->sar)))
256 #if FF_API_OLD_FILTER_OPTS
260 inlink->sample_aspect_ratio = s->sar;
262 compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
263 compute_dar(&dar, s->sar, inlink->w, inlink->h);
264 av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n",
265 inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den,
266 inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den, dar.num, dar.den);
271 static const AVOption setsar_options[] = {
272 { "sar", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
273 { "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
274 { "r", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
275 #if FF_API_OLD_FILTER_OPTS
276 { "sar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
278 { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
282 AVFILTER_DEFINE_CLASS(setsar);
284 static const AVFilterPad avfilter_vf_setsar_inputs[] = {
287 .type = AVMEDIA_TYPE_VIDEO,
288 .config_props = setsar_config_props,
289 .filter_frame = filter_frame,
294 static const AVFilterPad avfilter_vf_setsar_outputs[] = {
297 .type = AVMEDIA_TYPE_VIDEO,
302 AVFilter ff_vf_setsar = {
304 .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
306 .priv_size = sizeof(AspectContext),
307 .priv_class = &setsar_class,
308 .inputs = avfilter_vf_setsar_inputs,
309 .outputs = avfilter_vf_setsar_outputs,
312 #endif /* CONFIG_SETSAR_FILTER */