FFmpeg
aacsbr.h
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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  */
42 enum {
53 };
54 
55 /**
56  * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
57  */
58 enum {
63 };
64 
65 enum {
67 };
68 
69 static 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. */
83 /** Initialize one SBR context. */
85 /** Close one SBR context. */
87 /** Decode one SBR element. */
89  GetBitContext *gb, int crc, int cnt, int id_aac);
90 /** Apply one SBR element to one AAC element. */
91 void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
92  INTFLOAT* L, INTFLOAT *R);
93 
95 
96 #endif /* AVCODEC_AACSBR_H */
static const int8_t vlc_sbr_lav[10]
Definition: aacsbr.h:69
Definition: aacsbr.h:59
Definition: aacsbr.h:61
Definition: aacsbr.h:60
float INTFLOAT
Definition: aac_defines.h:86
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
void ff_aacsbr_func_ptr_init_mips(AACSBRContext *c)
Definition: aacsbr_mips.c:611
bitstream reader API header.
void AAC_RENAME() ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac, INTFLOAT *L, INTFLOAT *R)
Apply one SBR element to one AAC element.
#define R
Definition: huffyuvdsp.h:34
Spectral Band Replication definitions and structures.
#define AAC_RENAME(x)
Definition: aac_defines.h:84
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int AAC_RENAME() ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb, int crc, int cnt, int id_aac)
Decode one SBR element.
void AAC_RENAME() ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
Close one SBR context.
AAC definitions and structures.
#define L(x)
Definition: vp56_arith.h:36
void AAC_RENAME() ff_aac_sbr_init(void)
Initialize SBR.
void AAC_RENAME() ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr, int id_aac)
Initialize one SBR context.
main AAC context
Definition: aac.h:293
aacsbr functions pointers
Definition: sbr.h:120
Definition: aacsbr.h:62
Spectral Band Replication.
Definition: sbr.h:139