blob: bf3082485169ff8515bc09369b0fb466fa8aa5cc
1 | /* |
2 | * Copyright (c) 2010 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 |
23 | * aspect ratio modification video filters |
24 | */ |
25 | |
26 | #include <float.h> |
27 | |
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" |
34 | |
35 | #include "avfilter.h" |
36 | #include "internal.h" |
37 | #include "video.h" |
38 | |
39 | static const char *const var_names[] = { |
40 | "w", |
41 | "h", |
42 | "a", "dar", |
43 | "sar", |
44 | "hsub", |
45 | "vsub", |
46 | NULL |
47 | }; |
48 | |
49 | enum var_name { |
50 | VAR_W, |
51 | VAR_H, |
52 | VAR_A, VAR_DAR, |
53 | VAR_SAR, |
54 | VAR_HSUB, |
55 | VAR_VSUB, |
56 | VARS_NB |
57 | }; |
58 | |
59 | typedef struct AspectContext { |
60 | const AVClass *class; |
61 | AVRational dar; |
62 | AVRational sar; |
63 | int max; |
64 | #if FF_API_OLD_FILTER_OPTS |
65 | float aspect_den; |
66 | #endif |
67 | char *ratio_expr; |
68 | } AspectContext; |
69 | |
70 | static av_cold int init(AVFilterContext *ctx) |
71 | { |
72 | #if FF_API_OLD_FILTER_OPTS |
73 | AspectContext *s = ctx->priv; |
74 | int ret; |
75 | |
76 | if (s->ratio_expr && s->aspect_den > 0) { |
77 | double num; |
78 | av_log(ctx, AV_LOG_WARNING, |
79 | "num:den syntax is deprecated, please use num/den or named options instead\n"); |
80 | ret = av_expr_parse_and_eval(&num, s->ratio_expr, NULL, NULL, |
81 | NULL, NULL, NULL, NULL, NULL, 0, ctx); |
82 | if (ret < 0) { |
83 | av_log(ctx, AV_LOG_ERROR, "Unable to parse ratio numerator \"%s\"\n", s->ratio_expr); |
84 | return AVERROR(EINVAL); |
85 | } |
86 | s->sar = s->dar = av_d2q(num / s->aspect_den, s->max); |
87 | } |
88 | #endif |
89 | |
90 | return 0; |
91 | } |
92 | |
93 | static int filter_frame(AVFilterLink *link, AVFrame *frame) |
94 | { |
95 | AspectContext *s = link->dst->priv; |
96 | |
97 | frame->sample_aspect_ratio = s->sar; |
98 | return ff_filter_frame(link->dst->outputs[0], frame); |
99 | } |
100 | |
101 | #define OFFSET(x) offsetof(AspectContext, x) |
102 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
103 | |
104 | static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h) |
105 | { |
106 | if (sar.num && sar.den) { |
107 | av_reduce(&dar->num, &dar->den, sar.num * w, sar.den * h, INT_MAX); |
108 | } else { |
109 | av_reduce(&dar->num, &dar->den, w, h, INT_MAX); |
110 | } |
111 | } |
112 | |
113 | static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio) |
114 | { |
115 | AVFilterContext *ctx = inlink->dst; |
116 | AspectContext *s = inlink->dst->priv; |
117 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
118 | double var_values[VARS_NB], res; |
119 | int ret; |
120 | |
121 | var_values[VAR_W] = inlink->w; |
122 | var_values[VAR_H] = inlink->h; |
123 | var_values[VAR_A] = (double) inlink->w / inlink->h; |
124 | var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? |
125 | (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1; |
126 | var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR]; |
127 | var_values[VAR_HSUB] = 1 << desc->log2_chroma_w; |
128 | var_values[VAR_VSUB] = 1 << desc->log2_chroma_h; |
129 | |
130 | /* evaluate new aspect ratio*/ |
131 | ret = av_expr_parse_and_eval(&res, s->ratio_expr, |
132 | var_names, var_values, |
133 | NULL, NULL, NULL, NULL, NULL, 0, ctx); |
134 | if (ret < 0) { |
135 | ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx); |
136 | } else |
137 | *aspect_ratio = av_d2q(res, s->max); |
138 | |
139 | if (ret < 0) { |
140 | av_log(ctx, AV_LOG_ERROR, |
141 | "Error when evaluating the expression '%s'\n", s->ratio_expr); |
142 | return ret; |
143 | } |
144 | if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) { |
145 | av_log(ctx, AV_LOG_ERROR, |
146 | "Invalid string '%s' for aspect ratio\n", s->ratio_expr); |
147 | return AVERROR(EINVAL); |
148 | } |
149 | return 0; |
150 | } |
151 | |
152 | #if CONFIG_SETDAR_FILTER |
153 | |
154 | static int setdar_config_props(AVFilterLink *inlink) |
155 | { |
156 | AspectContext *s = inlink->dst->priv; |
157 | AVRational dar; |
158 | AVRational old_dar; |
159 | AVRational old_sar = inlink->sample_aspect_ratio; |
160 | int ret; |
161 | |
162 | #if FF_API_OLD_FILTER_OPTS |
163 | if (!(s->ratio_expr && s->aspect_den > 0)) { |
164 | #endif |
165 | if ((ret = get_aspect_ratio(inlink, &s->dar))) |
166 | return ret; |
167 | #if FF_API_OLD_FILTER_OPTS |
168 | } |
169 | #endif |
170 | |
171 | if (s->dar.num && s->dar.den) { |
172 | av_reduce(&s->sar.num, &s->sar.den, |
173 | s->dar.num * inlink->h, |
174 | s->dar.den * inlink->w, INT_MAX); |
175 | inlink->sample_aspect_ratio = s->sar; |
176 | dar = s->dar; |
177 | } else { |
178 | inlink->sample_aspect_ratio = (AVRational){ 1, 1 }; |
179 | dar = (AVRational){ inlink->w, inlink->h }; |
180 | } |
181 | |
182 | compute_dar(&old_dar, old_sar, inlink->w, inlink->h); |
183 | av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n", |
184 | inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den, |
185 | dar.num, dar.den, inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den); |
186 | |
187 | return 0; |
188 | } |
189 | |
190 | static const AVOption setdar_options[] = { |
191 | { "dar", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
192 | { "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
193 | { "r", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
194 | #if FF_API_OLD_FILTER_OPTS |
195 | { "dar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS }, |
196 | #endif |
197 | { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS }, |
198 | { NULL } |
199 | }; |
200 | |
201 | AVFILTER_DEFINE_CLASS(setdar); |
202 | |
203 | static const AVFilterPad avfilter_vf_setdar_inputs[] = { |
204 | { |
205 | .name = "default", |
206 | .type = AVMEDIA_TYPE_VIDEO, |
207 | .config_props = setdar_config_props, |
208 | .filter_frame = filter_frame, |
209 | }, |
210 | { NULL } |
211 | }; |
212 | |
213 | static const AVFilterPad avfilter_vf_setdar_outputs[] = { |
214 | { |
215 | .name = "default", |
216 | .type = AVMEDIA_TYPE_VIDEO, |
217 | }, |
218 | { NULL } |
219 | }; |
220 | |
221 | AVFilter ff_vf_setdar = { |
222 | .name = "setdar", |
223 | .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."), |
224 | .init = init, |
225 | .priv_size = sizeof(AspectContext), |
226 | .priv_class = &setdar_class, |
227 | .inputs = avfilter_vf_setdar_inputs, |
228 | .outputs = avfilter_vf_setdar_outputs, |
229 | }; |
230 | |
231 | #endif /* CONFIG_SETDAR_FILTER */ |
232 | |
233 | #if CONFIG_SETSAR_FILTER |
234 | |
235 | static int setsar_config_props(AVFilterLink *inlink) |
236 | { |
237 | AspectContext *s = inlink->dst->priv; |
238 | AVRational old_sar = inlink->sample_aspect_ratio; |
239 | AVRational old_dar, dar; |
240 | int ret; |
241 | |
242 | #if FF_API_OLD_FILTER_OPTS |
243 | if (!(s->ratio_expr && s->aspect_den > 0)) { |
244 | #endif |
245 | if ((ret = get_aspect_ratio(inlink, &s->sar))) |
246 | return ret; |
247 | #if FF_API_OLD_FILTER_OPTS |
248 | } |
249 | #endif |
250 | |
251 | inlink->sample_aspect_ratio = s->sar; |
252 | |
253 | compute_dar(&old_dar, old_sar, inlink->w, inlink->h); |
254 | compute_dar(&dar, s->sar, inlink->w, inlink->h); |
255 | av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n", |
256 | inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den, |
257 | inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den, dar.num, dar.den); |
258 | |
259 | return 0; |
260 | } |
261 | |
262 | static const AVOption setsar_options[] = { |
263 | { "sar", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
264 | { "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
265 | { "r", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
266 | #if FF_API_OLD_FILTER_OPTS |
267 | { "sar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS }, |
268 | #endif |
269 | { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS }, |
270 | { NULL } |
271 | }; |
272 | |
273 | AVFILTER_DEFINE_CLASS(setsar); |
274 | |
275 | static const AVFilterPad avfilter_vf_setsar_inputs[] = { |
276 | { |
277 | .name = "default", |
278 | .type = AVMEDIA_TYPE_VIDEO, |
279 | .config_props = setsar_config_props, |
280 | .filter_frame = filter_frame, |
281 | }, |
282 | { NULL } |
283 | }; |
284 | |
285 | static const AVFilterPad avfilter_vf_setsar_outputs[] = { |
286 | { |
287 | .name = "default", |
288 | .type = AVMEDIA_TYPE_VIDEO, |
289 | }, |
290 | { NULL } |
291 | }; |
292 | |
293 | AVFilter ff_vf_setsar = { |
294 | .name = "setsar", |
295 | .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."), |
296 | .init = init, |
297 | .priv_size = sizeof(AspectContext), |
298 | .priv_class = &setsar_class, |
299 | .inputs = avfilter_vf_setsar_inputs, |
300 | .outputs = avfilter_vf_setsar_outputs, |
301 | }; |
302 | |
303 | #endif /* CONFIG_SETSAR_FILTER */ |
304 |