FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_aspect.c
Date: 2024-04-12 08:31:17
Exec Total Coverage
Lines: 53 62 85.5%
Functions: 5 5 100.0%
Branches: 13 22 59.1%

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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 "config_components.h"
27
28 #include <float.h>
29
30 #include "libavutil/common.h"
31 #include "libavutil/eval.h"
32 #include "libavutil/mathematics.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/parseutils.h"
35 #include "libavutil/pixdesc.h"
36
37 #include "avfilter.h"
38 #include "internal.h"
39 #include "video.h"
40
41 static const char *const var_names[] = {
42 "w",
43 "h",
44 "a",
45 "dar",
46 "sar",
47 "hsub",
48 "vsub",
49 NULL
50 };
51
52 enum var_name {
53 VAR_W,
54 VAR_H,
55 VAR_A,
56 VAR_DAR,
57 VAR_SAR,
58 VAR_HSUB,
59 VAR_VSUB,
60 VARS_NB
61 };
62
63 typedef struct AspectContext {
64 const AVClass *class;
65 AVRational dar;
66 AVRational sar;
67 int max;
68 char *ratio_expr;
69 } AspectContext;
70
71 115 static int filter_frame(AVFilterLink *link, AVFrame *frame)
72 {
73 115 AspectContext *s = link->dst->priv;
74
75 115 frame->sample_aspect_ratio = s->sar;
76 115 return ff_filter_frame(link->dst->outputs[0], frame);
77 }
78
79 #define OFFSET(x) offsetof(AspectContext, x)
80 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
81
82 9 static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h)
83 {
84
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9 if (sar.num && sar.den) {
85 3 av_reduce(&dar->num, &dar->den, sar.num * (int64_t)w, sar.den * (int64_t)h, INT_MAX);
86 } else {
87 6 av_reduce(&dar->num, &dar->den, w, h, INT_MAX);
88 }
89 9 }
90
91 7 static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio)
92 {
93 7 AVFilterContext *ctx = inlink->dst;
94 7 AspectContext *s = inlink->dst->priv;
95 7 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
96 double var_values[VARS_NB], res;
97 int ret;
98
99 7 var_values[VAR_W] = inlink->w;
100 7 var_values[VAR_H] = inlink->h;
101 7 var_values[VAR_A] = (double) inlink->w / inlink->h;
102 14 var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
103
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7 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
104 7 var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
105 7 var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
106 7 var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
107
108 /* evaluate new aspect ratio*/
109 7 ret = av_expr_parse_and_eval(&res, s->ratio_expr,
110 var_names, var_values,
111 NULL, NULL, NULL, NULL, NULL, 0, ctx);
112
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7 if (ret < 0) {
113 ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx);
114 } else
115 7 *aspect_ratio = av_d2q(res, s->max);
116
117
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7 if (ret < 0) {
118 av_log(ctx, AV_LOG_ERROR,
119 "Error when evaluating the expression '%s'\n", s->ratio_expr);
120 return ret;
121 }
122
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7 if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) {
123 av_log(ctx, AV_LOG_ERROR,
124 "Invalid string '%s' for aspect ratio\n", s->ratio_expr);
125 return AVERROR(EINVAL);
126 }
127 7 return 0;
128 }
129
130 static const AVFilterPad aspect_inputs[] = {
131 {
132 .name = "default",
133 .type = AVMEDIA_TYPE_VIDEO,
134 .filter_frame = filter_frame,
135 },
136 };
137
138 #if CONFIG_SETDAR_FILTER
139
140 5 static int setdar_config_props(AVFilterLink *outlink)
141 {
142 5 AVFilterContext *ctx = outlink->src;
143 5 AVFilterLink *inlink = ctx->inputs[0];
144 5 AspectContext *s = ctx->priv;
145 AVRational dar;
146 AVRational old_dar;
147 5 AVRational old_sar = inlink->sample_aspect_ratio;
148 int ret;
149
150
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5 if ((ret = get_aspect_ratio(inlink, &s->dar)))
151 return ret;
152
153
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5 if (s->dar.num && s->dar.den) {
154 5 av_reduce(&s->sar.num, &s->sar.den,
155 5 s->dar.num * inlink->h,
156 5 s->dar.den * inlink->w, INT_MAX);
157 5 outlink->sample_aspect_ratio = s->sar;
158 5 dar = s->dar;
159 } else {
160 outlink->sample_aspect_ratio = (AVRational){ 1, 1 };
161 dar = (AVRational){ inlink->w, inlink->h };
162 }
163
164 5 compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
165 5 av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n",
166 inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den,
167 dar.num, dar.den, outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den);
168
169 5 return 0;
170 }
171
172 static const AVOption setdar_options[] = {
173 { "dar", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
174 { "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
175 { "r", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
176 { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
177 { NULL }
178 };
179
180 AVFILTER_DEFINE_CLASS(setdar);
181
182 static const AVFilterPad avfilter_vf_setdar_outputs[] = {
183 {
184 .name = "default",
185 .type = AVMEDIA_TYPE_VIDEO,
186 .config_props = setdar_config_props,
187 },
188 };
189
190 const AVFilter ff_vf_setdar = {
191 .name = "setdar",
192 .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
193 .priv_size = sizeof(AspectContext),
194 .priv_class = &setdar_class,
195 .flags = AVFILTER_FLAG_METADATA_ONLY,
196 FILTER_INPUTS(aspect_inputs),
197 FILTER_OUTPUTS(avfilter_vf_setdar_outputs),
198 };
199
200 #endif /* CONFIG_SETDAR_FILTER */
201
202 #if CONFIG_SETSAR_FILTER
203
204 2 static int setsar_config_props(AVFilterLink *outlink)
205 {
206 2 AVFilterContext *ctx = outlink->src;
207 2 AVFilterLink *inlink = ctx->inputs[0];
208 2 AspectContext *s = ctx->priv;
209 2 AVRational old_sar = inlink->sample_aspect_ratio;
210 AVRational old_dar, dar;
211 int ret;
212
213
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2 if ((ret = get_aspect_ratio(inlink, &s->sar)))
214 return ret;
215
216 2 outlink->sample_aspect_ratio = s->sar;
217
218 2 compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
219 2 compute_dar(&dar, s->sar, inlink->w, inlink->h);
220 2 av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n",
221 inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den,
222 outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den, dar.num, dar.den);
223
224 2 return 0;
225 }
226
227 static const AVOption setsar_options[] = {
228 { "sar", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
229 { "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
230 { "r", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
231 { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
232 { NULL }
233 };
234
235 AVFILTER_DEFINE_CLASS(setsar);
236
237 static const AVFilterPad avfilter_vf_setsar_outputs[] = {
238 {
239 .name = "default",
240 .type = AVMEDIA_TYPE_VIDEO,
241 .config_props = setsar_config_props,
242 },
243 };
244
245 const AVFilter ff_vf_setsar = {
246 .name = "setsar",
247 .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
248 .priv_size = sizeof(AspectContext),
249 .priv_class = &setsar_class,
250 .flags = AVFILTER_FLAG_METADATA_ONLY,
251 FILTER_INPUTS(aspect_inputs),
252 FILTER_OUTPUTS(avfilter_vf_setsar_outputs),
253 };
254
255 #endif /* CONFIG_SETSAR_FILTER */
256