Statistics
| Branch: | Revision:

ffmpeg / libavcodec / liba52 / a52_internal.h @ 976f969b

History | View | Annotate | Download (4.06 KB)

1 976f969b Zdenek Kabelac
/*
2
 * a52_internal.h
3
 * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
4
 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
5
 *
6
 * This file is part of a52dec, a free ATSC A-52 stream decoder.
7
 * See http://liba52.sourceforge.net/ for updates.
8
 *
9
 * a52dec is free software; you can redistribute it and/or modify
10
 * it under the terms of the GNU General Public License as published by
11
 * the Free Software Foundation; either version 2 of the License, or
12
 * (at your option) any later version.
13
 *
14
 * a52dec is distributed in the hope that it will be useful,
15
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17
 * GNU General Public License for more details.
18
 *
19
 * You should have received a copy of the GNU General Public License
20
 * along with this program; if not, write to the Free Software
21
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22
 */
23
24
typedef struct {
25
    uint8_t bai;                /* fine SNR offset, fast gain */
26
    uint8_t deltbae;                /* delta bit allocation exists */
27
    int8_t deltba[50];                /* per-band delta bit allocation */
28
} ba_t;
29
30
typedef struct {
31
    uint8_t exp[256];                /* decoded channel exponents */
32
    int8_t bap[256];                /* derived channel bit allocation */
33
} expbap_t;
34
35
struct a52_state_s {
36
    uint8_t fscod;                /* sample rate */
37
    uint8_t halfrate;                /* halfrate factor */
38
    uint8_t acmod;                /* coded channels */
39
    uint8_t lfeon;                /* coded lfe channel */
40
    sample_t clev;                /* centre channel mix level */
41
    sample_t slev;                /* surround channels mix level */
42
43
    int output;                        /* type of output */
44
    sample_t level;                /* output level */
45
    sample_t bias;                /* output bias */
46
47
    int dynrnge;                /* apply dynamic range */
48
    sample_t dynrng;                /* dynamic range */
49
    void * dynrngdata;                /* dynamic range callback funtion and data */
50
    sample_t (* dynrngcall) (sample_t range, void * dynrngdata);
51
52
    uint8_t chincpl;                /* channel coupled */
53
    uint8_t phsflginu;                /* phase flags in use (stereo only) */
54
    uint8_t cplstrtmant;        /* coupling channel start mantissa */
55
    uint8_t cplendmant;                /* coupling channel end mantissa */
56
    uint32_t cplbndstrc;        /* coupling band structure */
57
    sample_t cplco[5][18];        /* coupling coordinates */
58
59
    /* derived information */
60
    uint8_t cplstrtbnd;                /* coupling start band (for bit allocation) */
61
    uint8_t ncplbnd;                /* number of coupling bands */
62
63
    uint8_t rematflg;                /* stereo rematrixing */
64
65
    uint8_t endmant[5];                /* channel end mantissa */
66
67
    uint16_t bai;                /* bit allocation information */
68
69
    uint8_t csnroffst;                /* coarse SNR offset */
70
    ba_t cplba;                        /* coupling bit allocation parameters */
71
    ba_t ba[5];                        /* channel bit allocation parameters */
72
    ba_t lfeba;                        /* lfe bit allocation parameters */
73
74
    uint8_t cplfleak;                /* coupling fast leak init */
75
    uint8_t cplsleak;                /* coupling slow leak init */
76
77
    expbap_t cpl_expbap;
78
    expbap_t fbw_expbap[5];
79
    expbap_t lfe_expbap;
80
81
    sample_t * samples;
82
    int downmixed;
83
};
84
85
#define LEVEL_PLUS6DB 2.0
86
#define LEVEL_PLUS3DB 1.4142135623730951
87
#define LEVEL_3DB 0.7071067811865476
88
#define LEVEL_45DB 0.5946035575013605
89
#define LEVEL_6DB 0.5
90
91
#define EXP_REUSE (0)
92
#define EXP_D15   (1)
93
#define EXP_D25   (2)
94
#define EXP_D45   (3)
95
96
#define DELTA_BIT_REUSE (0)
97
#define DELTA_BIT_NEW (1)
98
#define DELTA_BIT_NONE (2)
99
#define DELTA_BIT_RESERVED (3)
100
101
void a52_bit_allocate (a52_state_t * state, ba_t * ba, int bndstart,
102
                       int start, int end, int fastleak, int slowleak,
103
                       expbap_t * expbap);
104
105
int a52_downmix_init (int input, int flags, sample_t * level,
106
                      sample_t clev, sample_t slev);
107
int a52_downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level,
108
                       sample_t clev, sample_t slev);
109
void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias,
110
                  sample_t clev, sample_t slev);
111
void a52_upmix (sample_t * samples, int acmod, int output);
112
113
void a52_imdct_init (uint32_t mm_accel);
114
void a52_imdct_256 (sample_t * data, sample_t * delay, sample_t bias);
115
void a52_imdct_512 (sample_t * data, sample_t * delay, sample_t bias);