FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/phase_template.c
Date: 2022-12-09 07:38:14
Exec Total Coverage
Lines: 51 88 58.0%
Functions: 0 0 -%
Branches: 0 0 -%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2004 Ville Saari
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 General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 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
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * 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 "libavutil/avassert.h"
22 #include "avfilter.h"
23 #include "formats.h"
24 #include "internal.h"
25 #include "video.h"
26
27 #undef pixel
28 #undef accumulator
29 #if DEPTH == 8
30 #define pixel uint8_t
31 #define accumulator int
32 #else
33 #define pixel uint16_t
34 #define accumulator int64_t
35 #endif
36
37 #define fn3(a,b) a##_##b
38 #define fn2(a,b) fn3(a,b)
39 #define fn(a) fn2(a, DEPTH)
40
41 /*
42 * This macro interpolates the value of both fields at a point halfway
43 * between lines and takes the squared difference. In field resolution
44 * the point is a quarter pixel below a line in one field and a quarter
45 * pixel above a line in other.
46 *
47 * (The result is actually multiplied by 25)
48 */
49 #define DIFF(a, as, b, bs) ((t) = ((*(a) - (b)[bs]) * 4) + (a)[(as) * 2] - (b)[-(bs)], (t) * (t))
50
51 /*
52 * Find which field combination has the smallest average squared difference
53 * between the fields.
54 */
55 49 static enum PhaseMode fn(analyze_plane)(void *ctx, enum PhaseMode mode, AVFrame *old, AVFrame *new)
56 {
57 double bdiff, tdiff, pdiff;
58
59 49 if (mode == AUTO) {
60 mode = new->interlaced_frame ? new->top_field_first ?
61 TOP_FIRST : BOTTOM_FIRST : PROGRESSIVE;
62 49 } else if (mode == AUTO_ANALYZE) {
63 49 mode = new->interlaced_frame ? new->top_field_first ?
64 49 TOP_FIRST_ANALYZE : BOTTOM_FIRST_ANALYZE : FULL_ANALYZE;
65 }
66
67 49 if (mode <= BOTTOM_FIRST) {
68 bdiff = pdiff = tdiff = 65536.0;
69 } else {
70 49 const double factor = 1. / (25. * (1 << (DEPTH - 8)) * (1 << (DEPTH - 8)));
71 49 const int ns = new->linesize[0] / sizeof(pixel);
72 49 const int os = old->linesize[0] / sizeof(pixel);
73 49 const pixel *nptr = (pixel *)new->data[0];
74 49 const pixel *optr = (pixel *)old->data[0];
75 49 const int h = new->height;
76 49 const int w = new->width;
77 accumulator bdif, tdif, pdif;
78 double scale;
79
80 49 int top = 0, t;
81 49 const pixel *rend, *end = nptr + (h - 2) * ns;
82
83 49 bdiff = pdiff = tdiff = 0.0;
84
85 49 nptr += ns;
86 49 optr += os;
87 14014 while (nptr < end) {
88 13965 pdif = tdif = bdif = 0;
89
90 13965 switch (mode) {
91 case TOP_FIRST_ANALYZE:
92 if (top) {
93 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
94 pdif += DIFF(nptr, ns, nptr, ns);
95 tdif += DIFF(nptr, ns, optr, os);
96 }
97 } else {
98 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
99 pdif += DIFF(nptr, ns, nptr, ns);
100 tdif += DIFF(optr, os, nptr, ns);
101 }
102 }
103 break;
104 case BOTTOM_FIRST_ANALYZE:
105 if (top) {
106 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
107 pdif += DIFF(nptr, ns, nptr, ns);
108 bdif += DIFF(optr, os, nptr, ns);
109 }
110 } else {
111 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
112 pdif += DIFF(nptr, ns, nptr, ns);
113 bdif += DIFF(nptr, ns, optr, os);
114 }
115 }
116 break;
117 case ANALYZE:
118 if (top) {
119 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
120 tdif += DIFF(nptr, ns, optr, os);
121 bdif += DIFF(optr, os, nptr, ns);
122 }
123 } else {
124 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
125 bdif += DIFF(nptr, ns, optr, os);
126 tdif += DIFF(optr, os, nptr, ns);
127 }
128 }
129 break;
130 13965 case FULL_ANALYZE:
131 13965 if (top) {
132 2456174 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
133 2449216 pdif += DIFF(nptr, ns, nptr, ns);
134 2449216 tdif += DIFF(nptr, ns, optr, os);
135 2449216 bdif += DIFF(optr, os, nptr, ns);
136 }
137 } else {
138 2473471 for (rend = nptr + w; nptr < rend; nptr++, optr++) {
139 2466464 pdif += DIFF(nptr, ns, nptr, ns);
140 2466464 bdif += DIFF(nptr, ns, optr, os);
141 2466464 tdif += DIFF(optr, os, nptr, ns);
142 }
143 }
144 13965 break;
145 default:
146 av_assert0(0);
147 }
148
149 13965 pdiff += (double)pdif;
150 13965 tdiff += (double)tdif;
151 13965 bdiff += (double)bdif;
152 13965 nptr += ns - w;
153 13965 optr += os - w;
154 13965 top ^= 1;
155 }
156
157 49 scale = 1.0 / (w * (h - 3)) * factor;
158 49 pdiff *= scale;
159 49 tdiff *= scale;
160 49 bdiff *= scale;
161
162 49 if (mode == TOP_FIRST_ANALYZE) {
163 bdiff = 65536.0;
164 49 } else if (mode == BOTTOM_FIRST_ANALYZE) {
165 tdiff = 65536.0;
166 49 } else if (mode == ANALYZE) {
167 pdiff = 65536.0;
168 }
169
170 49 if (bdiff < pdiff && bdiff < tdiff) {
171 mode = BOTTOM_FIRST;
172 49 } else if (tdiff < pdiff && tdiff < bdiff) {
173 mode = TOP_FIRST;
174 } else {
175 49 mode = PROGRESSIVE;
176 }
177 }
178
179 98 av_log(ctx, AV_LOG_DEBUG, "mode=%c tdiff=%f bdiff=%f pdiff=%f\n",
180 49 mode == BOTTOM_FIRST ? 'b' : mode == TOP_FIRST ? 't' : 'p',
181 tdiff, bdiff, pdiff);
182 49 return mode;
183 }
184