FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/scale_eval.c
Date: 2025-11-10 16:28:23
Exec Total Coverage
Lines: 16 66 24.2%
Functions: 1 2 50.0%
Branches: 9 36 25.0%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2007 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 #include <stdint.h>
22 #include "scale_eval.h"
23 #include "libavutil/eval.h"
24 #include "libavutil/mathematics.h"
25 #include "libavutil/pixdesc.h"
26
27 static const char *const var_names[] = {
28 "in_w", "iw",
29 "in_h", "ih",
30 "out_w", "ow",
31 "out_h", "oh",
32 "a",
33 "sar",
34 "dar",
35 "hsub",
36 "vsub",
37 "ohsub",
38 "ovsub",
39 NULL
40 };
41
42 enum var_name {
43 VAR_IN_W, VAR_IW,
44 VAR_IN_H, VAR_IH,
45 VAR_OUT_W, VAR_OW,
46 VAR_OUT_H, VAR_OH,
47 VAR_A,
48 VAR_SAR,
49 VAR_DAR,
50 VAR_HSUB,
51 VAR_VSUB,
52 VAR_OHSUB,
53 VAR_OVSUB,
54 VARS_NB
55 };
56
57 ✗ int ff_scale_eval_dimensions(void *log_ctx,
58 const char *w_expr, const char *h_expr,
59 AVFilterLink *inlink, AVFilterLink *outlink,
60 int *ret_w, int *ret_h)
61 {
62 ✗ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
63 ✗ const AVPixFmtDescriptor *out_desc = av_pix_fmt_desc_get(outlink->format);
64 const char *expr;
65 int eval_w, eval_h;
66 int ret;
67 double var_values[VARS_NB], res;
68
69 ✗ var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
70 ✗ var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
71 ✗ var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
72 ✗ var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
73 ✗ var_values[VAR_A] = (double) inlink->w / inlink->h;
74 ✗ var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
75 ✗ (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
76 ✗ var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
77 ✗ var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
78 ✗ var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
79 ✗ var_values[VAR_OHSUB] = 1 << out_desc->log2_chroma_w;
80 ✗ var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;
81
82 /* evaluate width and height */
83 ✗ av_expr_parse_and_eval(&res, (expr = w_expr),
84 var_names, var_values,
85 NULL, NULL, NULL, NULL, NULL, 0, log_ctx);
86 ✗ eval_w = var_values[VAR_OUT_W] = var_values[VAR_OW] = (int) res == 0 ? inlink->w : (int) res;
87
88 ✗ if ((ret = av_expr_parse_and_eval(&res, (expr = h_expr),
89 var_names, var_values,
90 NULL, NULL, NULL, NULL, NULL, 0, log_ctx)) < 0)
91 ✗ goto fail;
92 ✗ eval_h = var_values[VAR_OUT_H] = var_values[VAR_OH] = (int) res == 0 ? inlink->h : (int) res;
93 /* evaluate again the width, as it may depend on the output height */
94 ✗ if ((ret = av_expr_parse_and_eval(&res, (expr = w_expr),
95 var_names, var_values,
96 NULL, NULL, NULL, NULL, NULL, 0, log_ctx)) < 0)
97 ✗ goto fail;
98 ✗ eval_w = (int) res == 0 ? inlink->w : (int) res;
99
100 ✗ *ret_w = eval_w;
101 ✗ *ret_h = eval_h;
102
103 ✗ return 0;
104
105 ✗ fail:
106 ✗ av_log(log_ctx, AV_LOG_ERROR,
107 "Error when evaluating the expression '%s'.\n"
108 "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
109 expr, w_expr, h_expr);
110 ✗ return ret;
111 }
112
113 6665 int ff_scale_adjust_dimensions(AVFilterLink *inlink,
114 int *ret_w, int *ret_h,
115 int force_original_aspect_ratio, int force_divisible_by,
116 double w_adj)
117 {
118 int64_t w, h;
119 int factor_w, factor_h;
120
121 6665 w = *ret_w;
122 6665 h = *ret_h;
123
124 /* Check if it is requested that the result has to be divisible by some
125 * factor (w or h = -n with n being the factor). */
126 6665 factor_w = 1;
127 6665 factor_h = 1;
128
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 6665 if (w < -1) {
129 ✗ factor_w = -w;
130 }
131
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 6665 if (h < -1) {
132 ✗ factor_h = -h;
133 }
134
135
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 6665 if (w < 0 && h < 0) {
136 ✗ w = inlink->w * w_adj;
137 ✗ h = inlink->h;
138 }
139
140 /* Make sure that the result is divisible by the factor we determined
141 * earlier. If no factor was set, nothing will happen as the default
142 * factor is 1 */
143
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 6665 if (w < 0)
144 ✗ w = av_rescale(h, inlink->w * w_adj, inlink->h * factor_w) * factor_w;
145
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 6665 if (h < 0)
146 1 h = av_rescale(w, inlink->h, inlink->w * w_adj * factor_h) * factor_h;
147
148 /* Note that force_original_aspect_ratio may overwrite the previous set
149 * dimensions so that it is not divisible by the set factors anymore
150 * unless force_divisible_by is defined as well */
151
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 6665 if (force_original_aspect_ratio != SCALE_FORCE_OAR_DISABLE) {
152 // Including force_divisible_by here rounds to the nearest multiple of it.
153 ✗ int64_t tmp_w = av_rescale(h, inlink->w * w_adj, inlink->h * (int64_t)force_divisible_by)
154 ✗ * force_divisible_by;
155 ✗ int64_t tmp_h = av_rescale(w, inlink->h, inlink->w * w_adj * (int64_t)force_divisible_by)
156 ✗ * force_divisible_by;
157
158 ✗ if (force_original_aspect_ratio == SCALE_FORCE_OAR_DECREASE) {
159 ✗ w = FFMIN(tmp_w, w);
160 ✗ h = FFMIN(tmp_h, h);
161 ✗ if (force_divisible_by > 1) {
162 // round down in case provided w or h is not divisible.
163 ✗ w = w / force_divisible_by * force_divisible_by;
164 ✗ h = h / force_divisible_by * force_divisible_by;
165 }
166 } else { // SCALE_FORCE_OAR_INCREASE
167 ✗ w = FFMAX(tmp_w, w);
168 ✗ h = FFMAX(tmp_h, h);
169 ✗ if (force_divisible_by > 1) {
170 // round up in case provided w or h is not divisible.
171 ✗ w = (w + force_divisible_by - 1) / force_divisible_by * force_divisible_by;
172 ✗ h = (h + force_divisible_by - 1) / force_divisible_by * force_divisible_by;
173 }
174 }
175 }
176
177
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 6665 if ((int32_t)w != w || (int32_t)h != h)
178 ✗ return AVERROR(EINVAL);
179
180 6665 *ret_w = w;
181 6665 *ret_h = h;
182
183 6665 return 0;
184 }
185