FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dv.c
Date: 2025-10-19 14:07:46
Exec Total Coverage
Lines: 63 74 85.1%
Functions: 2 2 100.0%
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1 /*
2 * DV decoder
3 * Copyright (c) 2002 Fabrice Bellard
4 * Copyright (c) 2004 Roman Shaposhnik
5 *
6 * DV encoder
7 * Copyright (c) 2003 Roman Shaposhnik
8 *
9 * 50 Mbps (DVCPRO50) support
10 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
11 *
12 * 100 Mbps (DVCPRO HD) support
13 * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
14 * Final code by Roman Shaposhnik
15 *
16 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
17 * of DV technical info.
18 *
19 * This file is part of FFmpeg.
20 *
21 * FFmpeg is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU Lesser General Public
23 * License as published by the Free Software Foundation; either
24 * version 2.1 of the License, or (at your option) any later version.
25 *
26 * FFmpeg is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29 * Lesser General Public License for more details.
30 *
31 * You should have received a copy of the GNU Lesser General Public
32 * License along with FFmpeg; if not, write to the Free Software
33 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
34 */
35
36 /**
37 * @file
38 * DV codec.
39 */
40
41 #include <stdint.h>
42
43 #include "libavutil/pixfmt.h"
44
45 #include "dv_internal.h"
46 #include "dv_profile.h"
47
48 47223 static inline void dv_calc_mb_coordinates(const AVDVProfile *d, int chan,
49 int seq, int slot, uint16_t *tbl)
50 {
51 static const uint8_t off[] = { 2, 6, 8, 0, 4 };
52 static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 };
53 static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 };
54 static const uint8_t shuf3[] = { 18, 9, 27, 0, 36 };
55
56 static const uint8_t l_start[] = { 0, 4, 9, 13, 18, 22, 27, 31, 36, 40 };
57 static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 };
58
59 static const uint8_t serpent1[] = {
60 0, 1, 2, 2, 1, 0,
61 0, 1, 2, 2, 1, 0,
62 0, 1, 2, 2, 1, 0,
63 0, 1, 2, 2, 1, 0,
64 0, 1, 2
65 };
66 static const uint8_t serpent2[] = {
67 0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
68 0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
69 0, 1, 2, 3, 4, 5
70 };
71
72 static const uint8_t remap[][2] = {
73 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, /* dummy */
74 { 0, 0 }, { 0, 1 }, { 0, 2 }, { 0, 3 }, { 10, 0 },
75 { 10, 1 }, { 10, 2 }, { 10, 3 }, { 20, 0 }, { 20, 1 },
76 { 20, 2 }, { 20, 3 }, { 30, 0 }, { 30, 1 }, { 30, 2 },
77 { 30, 3 }, { 40, 0 }, { 40, 1 }, { 40, 2 }, { 40, 3 },
78 { 50, 0 }, { 50, 1 }, { 50, 2 }, { 50, 3 }, { 60, 0 },
79 { 60, 1 }, { 60, 2 }, { 60, 3 }, { 70, 0 }, { 70, 1 },
80 { 70, 2 }, { 70, 3 }, { 0, 64 }, { 0, 65 }, { 0, 66 },
81 { 10, 64 }, { 10, 65 }, { 10, 66 }, { 20, 64 }, { 20, 65 },
82 { 20, 66 }, { 30, 64 }, { 30, 65 }, { 30, 66 }, { 40, 64 },
83 { 40, 65 }, { 40, 66 }, { 50, 64 }, { 50, 65 }, { 50, 66 },
84 { 60, 64 }, { 60, 65 }, { 60, 66 }, { 70, 64 }, { 70, 65 },
85 { 70, 66 }, { 0, 67 }, { 20, 67 }, { 40, 67 }, { 60, 67 }
86 };
87
88 int i, k, m;
89 int x, y, blk;
90
91
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 283338 for (m = 0; m < 5; m++) {
92
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 236115 switch (d->width) {
93 91125 case 1440:
94 91125 blk = (chan * 11 + seq) * 27 + slot;
95
96
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 91125 if (chan == 0 && seq == 11) {
97 2025 x = m * 27 + slot;
98
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 2025 if (x < 90) {
99 1350 y = 0;
100 } else {
101 675 x = (x - 90) * 2;
102 675 y = 67;
103 }
104 } else {
105 89100 i = (4 * chan + blk + off[m]) % 11;
106 89100 k = (blk / 11) % 27;
107
108 89100 x = shuf1[m] + (chan & 1) * 9 + k % 9;
109 89100 y = (i * 3 + k / 9) * 2 + (chan >> 1) + 1;
110 }
111 91125 tbl[m] = (x << 1) | (y << 9);
112 91125 break;
113 ✗ case 1280:
114 ✗ blk = (chan * 10 + seq) * 27 + slot;
115
116 ✗ i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
117 ✗ k = (blk / 5) % 27;
118
119 ✗ x = shuf1[m] + (chan & 1) * 9 + k % 9;
120 ✗ y = (i * 3 + k / 9) * 2 + (chan >> 1) + 4;
121
122 ✗ if (x >= 80) {
123 ✗ x = remap[y][0] + ((x - 80) << (y > 59));
124 ✗ y = remap[y][1];
125 }
126 ✗ tbl[m] = (x << 1) | (y << 9);
127 ✗ break;
128 35100 case 960:
129 35100 blk = (chan * 10 + seq) * 27 + slot;
130
131 35100 i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
132 35100 k = (blk / 5) % 27 + (i & 1) * 3;
133
134 35100 x = shuf2[m] + k % 6 + 6 * (chan & 1);
135 35100 y = l_start[i] + k / 6 + 45 * (chan >> 1);
136 35100 tbl[m] = (x << 1) | (y << 9);
137 35100 break;
138 109890 case 720:
139
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 109890 switch (d->pix_fmt) {
140 45360 case AV_PIX_FMT_YUV422P:
141 45360 x = shuf3[m] + slot / 3;
142 45360 y = serpent1[slot] +
143 45360 ((((seq + off[m]) % d->difseg_size) << 1) + chan) * 3;
144 45360 tbl[m] = (x << 1) | (y << 8);
145 45360 break;
146 38880 case AV_PIX_FMT_YUV420P:
147 38880 x = shuf3[m] + slot / 3;
148 38880 y = serpent1[slot] +
149 38880 ((seq + off[m]) % d->difseg_size) * 3;
150 38880 tbl[m] = (x << 1) | (y << 9);
151 38880 break;
152 25650 case AV_PIX_FMT_YUV411P:
153 25650 i = (seq + off[m]) % d->difseg_size;
154
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 25650 k = slot + ((m == 1 || m == 2) ? 3 : 0);
155
156 25650 x = l_start_shuffled[m] + k / 6;
157 25650 y = serpent2[k] + i * 6;
158
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 25650 if (x > 21)
159 570 y = y * 2 - i * 6;
160 25650 tbl[m] = (x << 2) | (y << 8);
161 25650 break;
162 }
163 default:
164 109890 break;
165 }
166 }
167 47223 }
168
169 83 void ff_dv_init_dynamic_tables(DVwork_chunk *work_chunks, const AVDVProfile *d)
170 {
171 int j, i, c, s, p;
172
173 83 p = i = 0;
174
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 238 for (c = 0; c < d->n_difchan; c++) {
175
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 2001 for (s = 0; s < d->difseg_size; s++) {
176 1846 p += 6;
177
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 51688 for (j = 0; j < 27; j++) {
178 49842 p += !(j % 3);
179
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 49842 if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) &&
180
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 48627 !(DV_PROFILE_IS_720p50(d) && s > 9)) {
181 47223 dv_calc_mb_coordinates(d, c, s, j, &work_chunks[i].mb_coordinates[0]);
182 47223 work_chunks[i++].buf_offset = p;
183 }
184 49842 p += 5;
185 }
186 }
187 }
188 83 }
189