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ffmpeg/libavcodec/cfhddata.c
Andreas Rheinhardt 2d764069be avcodec/vlc: Use structure instead of VLC_TYPE array as VLC element 
In C, qualifiers for arrays are broken:
const VLC_TYPE (*foo)[2] is a pointer to an array of two const VLC_TYPE
elements and unfortunately this is not compatible with a pointer
to a const array of two VLC_TYPE, because the latter does not exist
as array types are never qualified (the qualifier applies to the base
type instead). This is the reason why get_vlc2() doesn't accept
a const VLC table despite not modifying the table at all, as
there is no automatic conversion from VLC_TYPE (*)[2] to
const VLC_TYPE (*)[2].

Fix this by using a structure VLCElem for the VLC table.
This also has the advantage of making it clear which
element is which.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-06-17 16:47:29 +02:00

372 lines
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/*
* Copyright (c) 2015 Kieran Kunhya
*
* 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
*/
#include <stdint.h>
#include "libavutil/attributes.h"
#include "cfhd.h"
/* some special codewords, not sure what they all mean */
#define TABLE_9_BAND_END1 0x1C7859Eh
#define TABLE_9_BAND_END_LEN1 25
#define TABLE_9_BAND_END2 0x38F0B3Fh
#define TABLE_9_BAND_END_LEN2 26
#define TABLE_9_BAND_END3 0x38F0B3Eh
#define TABLE_9_BAND_END_LEN3 26
#define NB_VLC_TABLE_9 (71 + 3)
#define NB_VLC_TABLE_18 (263 + 1)
static const uint32_t table_9_vlc_bits[NB_VLC_TABLE_9] = {
0, 0x2, 0xc, 0x1a,
0x1d, 0x1e, 0x39, 0x3e,
0x37, 0x7e, 0x6c, 0xe2,
0xfe, 0xdb, 0xe0, 0x1c3,
0x1c6, 0x1ff, 0x1fe, 0x1b5,
0x369, 0x385, 0x71d, 0x6d0,
0x708, 0x71f, 0xe3d, 0xe39,
0xe13, 0xe12, 0x1c71, 0x1b45,
0x1b47, 0x3689, 0x38f2, 0x38e1,
0x38e0, 0x38f1, 0x3688, 0x6d1b,
0x71e0, 0x6d19, 0x71e7, 0xe3cd,
0xda35, 0xda30, 0xe3c3, 0x1b469,
0x1b462, 0x1c798, 0x1b463, 0x1c799,
0x38f08, 0x38f09, 0x38f0a, 0x6d1a0,
0x6d1a3, 0x6d1a1, 0xda345, 0xda344,
0xe3c2d, 0xe3c2f, 0xe3c2e, 0x38f0b2,
0x71e160, 0x71e162, 0x71e166, 0x71e161,
0xe3c2ce, 0xe3c2c6, 0xe3c2c7, 0x1C7859E,
0x38F0B3F, 0x38F0B3E,
};
static const uint8_t table_9_vlc_len[NB_VLC_TABLE_9] = {
1, 2, 4, 5, 5, 5, 6, 6,
6, 7, 7, 8, 8, 8, 8, 9,
9, 9, 9, 9, 10, 10, 11, 11,
11, 11, 12, 12, 12, 12, 13, 13,
13, 14, 14, 14, 14, 14, 14, 15,
15, 15, 15, 16, 16, 16, 16, 17,
17, 17, 17, 17, 18, 18, 18, 19,
19, 19, 20, 20, 20, 20, 20, 22,
23, 23, 23, 23, 24, 24, 24, 25,
26, 26,
};
static const uint16_t table_9_vlc_run[NB_VLC_TABLE_9] = {
1, 1, 1, 1, 12, 1, 32, 160,
1, 1, 1, 320, 1, 1, 80, 120,
1, 1, 100, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1
};
static const uint8_t table_9_vlc_level[NB_VLC_TABLE_9] = {
0, 1, 2, 3, 0, 4, 0, 0,
5, 7, 6, 0, 9, 8, 0, 0,
11, 12, 0, 10, 13, 14, 17, 15,
16, 18, 22, 21, 20, 19, 25, 23,
24, 27, 31, 29, 28, 30, 26, 33,
34, 32, 35, 39, 37, 36, 38, 42,
40, 43, 41, 44, 45, 46, 47, 48,
50, 49, 52, 51, 53, 55, 54, 56,
57, 59, 60, 58, 61, 62, 63, 64,
64, 64,
};
static const uint32_t table_18_vlc_bits[NB_VLC_TABLE_18] = {
0, 0x2, 0x7, 0x19,
0x30, 0x36, 0x6f, 0x63,
0x69, 0x6b, 0xd1, 0xd4,
0xdc, 0x189, 0x18a, 0x1a0,
0x1ab, 0x377, 0x310, 0x316,
0x343, 0x354, 0x375, 0x623,
0x684, 0x685, 0x6ab, 0x6ec,
0xddb, 0xc5c, 0xc5e, 0xc44,
0xd55, 0xdd1, 0xdd3, 0x1bb5,
0x188b, 0x18bb, 0x18bf, 0x1aa8,
0x1ba0, 0x1ba5, 0x1ba4, 0x3115,
0x3175, 0x317d, 0x3553, 0x3768,
0x6e87, 0x6ed3, 0x62e8, 0x62f8,
0x6228, 0x6aa4, 0x6e85, 0xc453,
0xc5d3, 0xc5f3, 0xdda4, 0xdd08,
0xdd0c, 0x1bb4b, 0x1bb4a, 0x18ba5,
0x18be5, 0x1aa95, 0x1aa97, 0x188a4,
0x1ba13, 0x31748, 0x317c8, 0x35528,
0x3552c, 0x37424, 0x37434, 0x37436,
0x62294, 0x62e92, 0x62f92, 0x6aa52,
0x6aa5a, 0x6e86a, 0x6e86e, 0x6e84a,
0xc452a, 0xc5d27, 0xc5f26, 0xd54a6,
0xd54b6, 0xdd096, 0xdd0d6, 0xdd0de,
0x188a56, 0x18ba4d, 0x18be4e, 0x18be4f,
0x1aa96e, 0x1ba12e, 0x1ba12f, 0x1ba1af,
0x1ba1bf, 0x37435d, 0x37437d, 0x317498,
0x35529c, 0x35529d, 0x3552de, 0x3552df,
0x62e933, 0x62295d, 0x6aa53d, 0x6aa53f,
0x6aa53e, 0x6e86b9, 0x6e86f8, 0xd54a79,
0xc5d265, 0xc452b8, 0xdd0d71, 0xd54a78,
0xdd0d70, 0xdd0df2, 0xdd0df3, 0x188a5f6,
0x188a5f5, 0x188a5f4, 0x188a5f3, 0x188a5f2,
0x188a5f1, 0x188a5f0, 0x188a5ef, 0x188a5ee,
0x188a5ed, 0x188a5aa, 0x188a5e3, 0x188a5df,
0x188a589, 0x188a5dd, 0x188a578, 0x188a5e0,
0x188a588, 0x188a5d6, 0x188a5db, 0x188a5e1,
0x188a587, 0x188a59a, 0x188a5c4, 0x188a5ec,
0x188a586, 0x188a573, 0x188a59c, 0x188a5c8,
0x188a5fb, 0x188a5a1, 0x188a5eb, 0x188a5a8,
0x188a584, 0x188a5d2, 0x188a599, 0x188a598,
0x188a583, 0x18ba4c9, 0x188a5d0, 0x188a594,
0x188a582, 0x188a5cb, 0x188a5d8, 0x188a5e7,
0x188a581, 0x188a5ea, 0x188a5a9, 0x188a5a6,
0x188a580, 0x188a5a0, 0x188a59d, 0x188a5c3,
0x188a57f, 0x188a5c0, 0x188a5de, 0x188a5d4,
0x188a57e, 0x188a5c2, 0x188a592, 0x188a5cd,
0x188a57d, 0x188a5a3, 0x188a5e8, 0x188a5a2,
0x188a57c, 0x188a58e, 0x188a5b3, 0x188a5b2,
0x188a5b1, 0x188a5b0, 0x188a5af, 0x188a5ae,
0x188a5ad, 0x188a5ac, 0x188a5ab, 0x188a5da,
0x188a5e4, 0x188a5e5, 0x188a5d9, 0x188a5b5,
0x188a5bc, 0x188a5bd, 0x188a5e9, 0x188a5cc,
0x188a585, 0x188a5d3, 0x188a5e2, 0x188a595,
0x188a596, 0x188a5b8, 0x188a590, 0x188a5c9,
0x188a5a4, 0x188a5e6, 0x188a5a5, 0x188a5ce,
0x188a5bf, 0x188a572, 0x188a59b, 0x188a5be,
0x188a5c7, 0x188a5ca, 0x188a5d5, 0x188a57b,
0x188a58d, 0x188a58c, 0x188a58b, 0x188a58a,
0x18ba4c8, 0x188a5c5, 0x188a5fa, 0x188a5bb,
0x188a5c1, 0x188a5cf, 0x188a5b9, 0x188a5b6,
0x188a597, 0x188a5fe, 0x188a5d7, 0x188a5ba,
0x188a591, 0x188a5c6, 0x188a5dc, 0x188a57a,
0x188a59f, 0x188a5f9, 0x188a5b4, 0x188a5a7,
0x188a58f, 0x188a5fd, 0x188a5b7, 0x188a593,
0x188a59e, 0x188a5f8, 0x188a5ff, 0x188a5fc,
0x188a579, 0x188a5f7, 0x3114ba2, 0x3114ba3,
};
static const uint8_t table_18_vlc_len[NB_VLC_TABLE_18] = {
1, 2, 3, 5, 6, 6, 7, 7,
7, 7, 8, 8, 8, 9, 9, 9,
9, 10, 10, 10, 10, 10, 10, 11,
11, 11, 11, 11, 12, 12, 12, 12,
12, 12, 12, 13, 13, 13, 13, 13,
13, 13, 13, 14, 14, 14, 14, 14,
15, 15, 15, 15, 15, 15, 15, 16,
16, 16, 16, 16, 16, 17, 17, 17,
17, 17, 17, 17, 17, 18, 18, 18,
18, 18, 18, 18, 19, 19, 19, 19,
19, 19, 19, 19, 20, 20, 20, 20,
20, 20, 20, 20, 21, 21, 21, 21,
21, 21, 21, 21, 21, 22, 22, 22,
22, 22, 22, 22, 23, 23, 23, 23,
23, 23, 23, 24, 24, 24, 24, 24,
24, 24, 24, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 26, 26,
};
static const uint16_t table_18_vlc_run[NB_VLC_TABLE_18] = {
1, 1, 1, 1, 1, 1, 1, 1,
12, 1, 20, 1, 1, 1, 32, 1,
1, 1, 1, 1, 60, 1, 1, 1,
1, 100, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 180, 1,
1, 320, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 2,
};
static const uint8_t table_18_vlc_level[NB_VLC_TABLE_18] = {
0, 1, 2, 3, 4, 5, 8, 6,
0, 7, 0, 9, 10, 11, 0, 12,
13, 18, 14, 15, 0, 16, 17, 19,
20, 0, 21, 22, 29, 24, 25, 23,
26, 27, 28, 35, 30, 31, 0, 32,
33, 0, 34, 36, 37, 38, 39, 40,
46, 47, 42, 43, 41, 44, 45, 48,
49, 50, 53, 51, 52, 61, 60, 55,
56, 57, 58, 54, 59, 62, 63, 64,
65, 66, 67, 68, 69, 70, 71, 72,
73, 75, 76, 74, 77, 78, 79, 80,
81, 82, 83, 84, 85, 86, 87, 88,
89, 90, 91, 92, 93, 99, 100, 94,
95, 96, 97, 98, 102, 101, 103, 105,
104, 106, 107, 111, 109, 108, 113, 110,
112, 114, 115, 225, 189, 188, 203, 202,
197, 207, 169, 223, 159, 235, 152, 192,
179, 201, 172, 149, 178, 120, 219, 150,
127, 211, 125, 158, 247, 238, 163, 228,
183, 217, 168, 122, 128, 249, 187, 186,
136, 181, 255, 230, 135, 233, 222, 145,
134, 167, 248, 209, 243, 216, 164, 140,
157, 239, 191, 251, 156, 139, 242, 133,
162, 213, 165, 212, 227, 198, 236, 234,
117, 215, 124, 123, 254, 253, 148, 218,
146, 147, 224, 143, 184, 185, 166, 132,
129, 250, 151, 119, 193, 176, 245, 229,
206, 144, 208, 137, 241, 237, 190, 240,
131, 232, 252, 171, 205, 204, 118, 214,
180, 126, 182, 175, 141, 138, 177, 153,
194, 160, 121, 174, 246, 130, 200, 170,
221, 196, 142, 210, 199, 155, 154, 244,
220, 195, 161, 231, 173, 226, 116, 255,
};
av_cold int ff_cfhd_init_vlcs(CFHDContext *s)
{
int i, j, ret = 0;
uint32_t new_cfhd_vlc_bits[NB_VLC_TABLE_18 * 2];
uint8_t new_cfhd_vlc_len[NB_VLC_TABLE_18 * 2];
uint16_t new_cfhd_vlc_run[NB_VLC_TABLE_18 * 2];
int16_t new_cfhd_vlc_level[NB_VLC_TABLE_18 * 2];
/** Similar to dv.c, generate signed VLC tables **/
/* Table 9 */
for (i = 0, j = 0; i < NB_VLC_TABLE_9; i++, j++) {
new_cfhd_vlc_bits[j] = table_9_vlc_bits[i];
new_cfhd_vlc_len[j] = table_9_vlc_len[i];
new_cfhd_vlc_run[j] = table_9_vlc_run[i];
new_cfhd_vlc_level[j] = table_9_vlc_level[i];
/* Don't include the zero level nor escape bits */
if (table_9_vlc_level[i] &&
new_cfhd_vlc_bits[j] != table_9_vlc_bits[NB_VLC_TABLE_9-1]) {
new_cfhd_vlc_bits[j] <<= 1;
new_cfhd_vlc_len[j]++;
j++;
new_cfhd_vlc_bits[j] = (table_9_vlc_bits[i] << 1) | 1;
new_cfhd_vlc_len[j] = table_9_vlc_len[i] + 1;
new_cfhd_vlc_run[j] = table_9_vlc_run[i];
new_cfhd_vlc_level[j] = -table_9_vlc_level[i];
}
}
ret = init_vlc(&s->vlc_9, VLC_BITS, j, new_cfhd_vlc_len,
1, 1, new_cfhd_vlc_bits, 4, 4, 0);
if (ret < 0)
return ret;
for (i = 0; i < s->vlc_9.table_size; i++) {
int code = s->vlc_9.table[i].sym;
int len = s->vlc_9.table[i].len;
int level, run;
if (len < 0) { // more bits needed
run = 0;
level = code;
} else {
run = new_cfhd_vlc_run[code];
level = new_cfhd_vlc_level[code];
}
s->table_9_rl_vlc[i].len = len;
s->table_9_rl_vlc[i].level = level;
s->table_9_rl_vlc[i].run = run;
}
/* Table 18 */
for (i = 0, j = 0; i < NB_VLC_TABLE_18; i++, j++) {
new_cfhd_vlc_bits[j] = table_18_vlc_bits[i];
new_cfhd_vlc_len[j] = table_18_vlc_len[i];
new_cfhd_vlc_run[j] = table_18_vlc_run[i];
new_cfhd_vlc_level[j] = table_18_vlc_level[i];
/* Don't include the zero level nor escape bits */
if (table_18_vlc_level[i] &&
new_cfhd_vlc_bits[j] != table_18_vlc_bits[NB_VLC_TABLE_18-1]) {
new_cfhd_vlc_bits[j] <<= 1;
new_cfhd_vlc_len[j]++;
j++;
new_cfhd_vlc_bits[j] = (table_18_vlc_bits[i] << 1) | 1;
new_cfhd_vlc_len[j] = table_18_vlc_len[i] + 1;
new_cfhd_vlc_run[j] = table_18_vlc_run[i];
new_cfhd_vlc_level[j] = -table_18_vlc_level[i];
}
}
ret = init_vlc(&s->vlc_18, VLC_BITS, j, new_cfhd_vlc_len,
1, 1, new_cfhd_vlc_bits, 4, 4, 0);
if (ret < 0)
return ret;
av_assert0(s->vlc_18.table_size == 4572);
for (i = 0; i < s->vlc_18.table_size; i++) {
int code = s->vlc_18.table[i].sym;
int len = s->vlc_18.table[i].len;
int level, run;
if (len < 0) { // more bits needed
run = 0;
level = code;
} else {
run = new_cfhd_vlc_run[code];
level = new_cfhd_vlc_level[code];
}
s->table_18_rl_vlc[i].len = len;
s->table_18_rl_vlc[i].level = level;
s->table_18_rl_vlc[i].run = run;
}
return ret;
}
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