summaryrefslogtreecommitdiff
path: root/libavcodec/dv.c
blob: eb49978ad8f4d4695f172ac7403bd17b1f401077 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/*
 * DV decoder
 * Copyright (c) 2002 Fabrice Bellard
 * Copyright (c) 2004 Roman Shaposhnik
 *
 * DV encoder
 * Copyright (c) 2003 Roman Shaposhnik
 *
 * 50 Mbps (DVCPRO50) support
 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
 *
 * 100 Mbps (DVCPRO HD) support
 * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
 * Final code by Roman Shaposhnik
 *
 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
 * of DV technical info.
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * DV codec.
 */

#include <stdint.h>

#include "libavutil/pixfmt.h"

#include "dv_internal.h"
#include "dv_profile.h"

static inline void dv_calc_mb_coordinates(const AVDVProfile *d, int chan,
                                          int seq, int slot, uint16_t *tbl)
{
    static const uint8_t off[]   = {  2,  6,  8, 0,  4 };
    static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 };
    static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 };
    static const uint8_t shuf3[] = { 18,  9, 27, 0, 36 };

    static const uint8_t l_start[]          = { 0, 4, 9, 13, 18, 22, 27, 31, 36, 40 };
    static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 };

    static const uint8_t serpent1[] = {
        0, 1, 2, 2, 1, 0,
        0, 1, 2, 2, 1, 0,
        0, 1, 2, 2, 1, 0,
        0, 1, 2, 2, 1, 0,
        0, 1, 2
    };
    static const uint8_t serpent2[] = {
        0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
        0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
        0, 1, 2, 3, 4, 5
    };

    static const uint8_t remap[][2] = {
        {  0,  0 }, {  0,  0 }, {  0,  0 }, {  0,  0 }, /* dummy */
        {  0,  0 }, {  0,  1 }, {  0,  2 }, {  0,  3 }, { 10,  0 },
        { 10,  1 }, { 10,  2 }, { 10,  3 }, { 20,  0 }, { 20,  1 },
        { 20,  2 }, { 20,  3 }, { 30,  0 }, { 30,  1 }, { 30,  2 },
        { 30,  3 }, { 40,  0 }, { 40,  1 }, { 40,  2 }, { 40,  3 },
        { 50,  0 }, { 50,  1 }, { 50,  2 }, { 50,  3 }, { 60,  0 },
        { 60,  1 }, { 60,  2 }, { 60,  3 }, { 70,  0 }, { 70,  1 },
        { 70,  2 }, { 70,  3 }, {  0, 64 }, {  0, 65 }, {  0, 66 },
        { 10, 64 }, { 10, 65 }, { 10, 66 }, { 20, 64 }, { 20, 65 },
        { 20, 66 }, { 30, 64 }, { 30, 65 }, { 30, 66 }, { 40, 64 },
        { 40, 65 }, { 40, 66 }, { 50, 64 }, { 50, 65 }, { 50, 66 },
        { 60, 64 }, { 60, 65 }, { 60, 66 }, { 70, 64 }, { 70, 65 },
        { 70, 66 }, {  0, 67 }, { 20, 67 }, { 40, 67 }, { 60, 67 }
    };

    int i, k, m;
    int x, y, blk;

    for (m = 0; m < 5; m++) {
        switch (d->width) {
        case 1440:
            blk = (chan * 11 + seq) * 27 + slot;

            if (chan == 0 && seq == 11) {
                x = m * 27 + slot;
                if (x < 90) {
                    y = 0;
                } else {
                    x = (x - 90) * 2;
                    y = 67;
                }
            } else {
                i = (4 * chan + blk + off[m]) % 11;
                k = (blk / 11) % 27;

                x = shuf1[m] + (chan & 1) * 9 + k % 9;
                y = (i * 3 + k / 9) * 2 + (chan >> 1) + 1;
            }
            tbl[m] = (x << 1) | (y << 9);
            break;
        case 1280:
            blk = (chan * 10 + seq) * 27 + slot;

            i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
            k = (blk / 5) % 27;

            x = shuf1[m] + (chan & 1) * 9 + k % 9;
            y = (i * 3 + k / 9) * 2 + (chan >> 1) + 4;

            if (x >= 80) {
                x = remap[y][0] + ((x - 80) << (y > 59));
                y = remap[y][1];
            }
            tbl[m] = (x << 1) | (y << 9);
            break;
        case 960:
            blk = (chan * 10 + seq) * 27 + slot;

            i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10;
            k = (blk / 5) % 27 + (i & 1) * 3;

            x      = shuf2[m]   + k % 6 +  6 * (chan  & 1);
            y      = l_start[i] + k / 6 + 45 * (chan >> 1);
            tbl[m] = (x << 1) | (y << 9);
            break;
        case 720:
            switch (d->pix_fmt) {
            case AV_PIX_FMT_YUV422P:
                x = shuf3[m] + slot / 3;
                y = serpent1[slot] +
                    ((((seq + off[m]) % d->difseg_size) << 1) + chan) * 3;
                tbl[m] = (x << 1) | (y << 8);
                break;
            case AV_PIX_FMT_YUV420P:
                x = shuf3[m] + slot / 3;
                y = serpent1[slot] +
                    ((seq + off[m]) % d->difseg_size) * 3;
                tbl[m] = (x << 1) | (y << 9);
                break;
            case AV_PIX_FMT_YUV411P:
                i = (seq + off[m]) % d->difseg_size;
                k = slot + ((m == 1 || m == 2) ? 3 : 0);

                x = l_start_shuffled[m] + k / 6;
                y = serpent2[k] + i * 6;
                if (x > 21)
                    y = y * 2 - i * 6;
                tbl[m] = (x << 2) | (y << 8);
                break;
            }
        default:
            break;
        }
    }
}

int ff_dv_init_dynamic_tables(DVwork_chunk *work_chunks, const AVDVProfile *d)
{
    int j, i, c, s, p;

    p = i = 0;
    for (c = 0; c < d->n_difchan; c++) {
        for (s = 0; s < d->difseg_size; s++) {
            p += 6;
            for (j = 0; j < 27; j++) {
                p += !(j % 3);
                if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) &&
                    !(DV_PROFILE_IS_720p50(d) && s > 9)) {
                    dv_calc_mb_coordinates(d, c, s, j, &work_chunks[i].mb_coordinates[0]);
                    work_chunks[i++].buf_offset = p;
                }
                p += 5;
            }
        }
    }

    return 0;
}