xref: /third_party/ffmpeg/libavcodec/aacsbr.h (revision cabdff1a) 
1/*
2 * AAC Spectral Band Replication function declarations
3 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
4 * Copyright (c) 2010      Alex Converse <alex.converse@gmail.com>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file
25 * AAC Spectral Band Replication function declarations
26 * @author Robert Swain ( rob opendot cl )
27 */
28
29#ifndef AVCODEC_AACSBR_H
30#define AVCODEC_AACSBR_H
31
32#include "get_bits.h"
33#include "aac.h"
34#include "sbr.h"
35
36#define ENVELOPE_ADJUSTMENT_OFFSET 2
37#define NOISE_FLOOR_OFFSET 6
38
39/**
40 * SBR VLC tables
41 */
42enum {
43    T_HUFFMAN_ENV_1_5DB,
44    F_HUFFMAN_ENV_1_5DB,
45    T_HUFFMAN_ENV_BAL_1_5DB,
46    F_HUFFMAN_ENV_BAL_1_5DB,
47    T_HUFFMAN_ENV_3_0DB,
48    F_HUFFMAN_ENV_3_0DB,
49    T_HUFFMAN_ENV_BAL_3_0DB,
50    F_HUFFMAN_ENV_BAL_3_0DB,
51    T_HUFFMAN_NOISE_3_0DB,
52    T_HUFFMAN_NOISE_BAL_3_0DB,
53};
54
55/**
56 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
57 */
58enum {
59    FIXFIX,
60    FIXVAR,
61    VARFIX,
62    VARVAR,
63};
64
65enum {
66    EXTENSION_ID_PS = 2,
67};
68
69static const int8_t vlc_sbr_lav[10] =
70    { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
71
72#define SBR_INIT_VLC_STATIC(num, size) \
73    INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size,     \
74                    sbr_tmp[num].sbr_bits ,                      1,                      1, \
75                    sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
76                    size)
77
78#define SBR_VLC_ROW(name) \
79    { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
80
81/** Initialize SBR. */
82void AAC_RENAME(ff_aac_sbr_init)(void);
83/** Initialize one SBR context. */
84void AAC_RENAME(ff_aac_sbr_ctx_init)(AACContext *ac, SpectralBandReplication *sbr, int id_aac);
85/** Close one SBR context. */
86void AAC_RENAME(ff_aac_sbr_ctx_close)(SpectralBandReplication *sbr);
87/** Decode one SBR element. */
88int AAC_RENAME(ff_decode_sbr_extension)(AACContext *ac, SpectralBandReplication *sbr,
89                            GetBitContext *gb, int crc, int cnt, int id_aac);
90/** Apply one SBR element to one AAC element. */
91void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
92                  INTFLOAT* L, INTFLOAT *R);
93
94void ff_aacsbr_func_ptr_init_mips(AACSBRContext *c);
95
96#endif /* AVCODEC_AACSBR_H */
97