FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/scale_eval.c
Date: 2022-12-06 04:36:11
Exec Total Coverage
Lines: 15 62 24.2%
Functions: 1 2 50.0%
Branches: 7 32 21.9%

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 5049 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 {
117 int w, h;
118 int factor_w, factor_h;
119
120 5049 w = *ret_w;
121 5049 h = *ret_h;
122
123 /* Check if it is requested that the result has to be divisible by some
124 * factor (w or h = -n with n being the factor). */
125 5049 factor_w = 1;
126 5049 factor_h = 1;
127
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 5049 times.
5049 if (w < -1) {
128 factor_w = -w;
129 }
130
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 5049 times.
5049 if (h < -1) {
131 factor_h = -h;
132 }
133
134
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 5049 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
5049 if (w < 0 && h < 0) {
135 w = inlink->w;
136 h = inlink->h;
137 }
138
139 /* Make sure that the result is divisible by the factor we determined
140 * earlier. If no factor was set, nothing will happen as the default
141 * factor is 1 */
142
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 5049 times.
5049 if (w < 0)
143 w = av_rescale(h, inlink->w, inlink->h * factor_w) * factor_w;
144
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 5048 times.
5049 if (h < 0)
145 1 h = av_rescale(w, inlink->h, inlink->w * factor_h) * factor_h;
146
147 /* Note that force_original_aspect_ratio may overwrite the previous set
148 * dimensions so that it is not divisible by the set factors anymore
149 * unless force_divisible_by is defined as well */
150
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 5049 times.
5049 if (force_original_aspect_ratio) {
151 // Including force_divisible_by here rounds to the nearest multiple of it.
152 int tmp_w = av_rescale(h, inlink->w, inlink->h * (int64_t)force_divisible_by)
153 * force_divisible_by;
154 int tmp_h = av_rescale(w, inlink->h, inlink->w * (int64_t)force_divisible_by)
155 * force_divisible_by;
156
157 if (force_original_aspect_ratio == 1) {
158 w = FFMIN(tmp_w, w);
159 h = FFMIN(tmp_h, h);
160 if (force_divisible_by > 1) {
161 // round down in case provided w or h is not divisible.
162 w = w / force_divisible_by * force_divisible_by;
163 h = h / force_divisible_by * force_divisible_by;
164 }
165 } else {
166 w = FFMAX(tmp_w, w);
167 h = FFMAX(tmp_h, h);
168 if (force_divisible_by > 1) {
169 // round up in case provided w or h is not divisible.
170 w = (w + force_divisible_by - 1) / force_divisible_by * force_divisible_by;
171 h = (h + force_divisible_by - 1) / force_divisible_by * force_divisible_by;
172 }
173 }
174 }
175
176 5049 *ret_w = w;
177 5049 *ret_h = h;
178
179 5049 return 0;
180 }
181