FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aac.h
Date: 2025-10-24 21:16:34
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1 /*
2 * AAC definitions and structures
3 * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
4 * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov 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 definitions and structures
26 * @author Oded Shimon ( ods15 ods15 dyndns org )
27 * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
28 */
29
30 #ifndef AVCODEC_AAC_H
31 #define AVCODEC_AAC_H
32
33 #define MAX_CHANNELS 64
34 #define MAX_ELEM_ID 64
35
36 #define TNS_MAX_ORDER 20
37 #define MAX_LTP_LONG_SFB 40
38
39 enum RawDataBlockType {
40 TYPE_SCE,
41 TYPE_CPE,
42 TYPE_CCE,
43 TYPE_LFE,
44 TYPE_DSE,
45 TYPE_PCE,
46 TYPE_FIL,
47 TYPE_END,
48 };
49
50 enum ExtensionPayloadID {
51 EXT_FILL,
52 EXT_FILL_DATA,
53 EXT_DATA_ELEMENT,
54 EXT_DYNAMIC_RANGE = 0xb,
55 EXT_SBR_DATA = 0xd,
56 EXT_SBR_DATA_CRC = 0xe,
57 };
58
59 enum WindowSequence {
60 ONLY_LONG_SEQUENCE,
61 LONG_START_SEQUENCE,
62 EIGHT_SHORT_SEQUENCE,
63 LONG_STOP_SEQUENCE,
64 };
65
66 enum BandType {
67 ZERO_BT = 0, ///< Scalefactors and spectral data are all zero.
68 FIRST_PAIR_BT = 5, ///< This and later band types encode two values (rather than four) with one code word.
69 ESC_BT = 11, ///< Spectral data are coded with an escape sequence.
70 RESERVED_BT = 12, ///< Band types following are encoded differently from others.
71 NOISE_BT = 13, ///< Spectral data are scaled white noise not coded in the bitstream.
72 INTENSITY_BT2 = 14, ///< Scalefactor data are intensity stereo positions (out of phase).
73 INTENSITY_BT = 15, ///< Scalefactor data are intensity stereo positions (in phase).
74 };
75
76 enum ChannelPosition {
77 AAC_CHANNEL_OFF = 0,
78 AAC_CHANNEL_FRONT = 1,
79 AAC_CHANNEL_SIDE = 2,
80 AAC_CHANNEL_BACK = 3,
81 AAC_CHANNEL_LFE = 4,
82 AAC_CHANNEL_CC = 5,
83 };
84
85 #define MAX_PREDICTORS 672
86
87 #define SCALE_DIV_512 36 ///< scalefactor difference that corresponds to scale difference in 512 times
88 #define SCALE_ONE_POS 140 ///< scalefactor index that corresponds to scale=1.0
89 #define SCALE_MAX_POS 255 ///< scalefactor index maximum value
90 #define SCALE_MAX_DIFF 60 ///< maximum scalefactor difference allowed by standard
91 #define SCALE_DIFF_ZERO 60 ///< codebook index corresponding to zero scalefactor indices difference
92
93 #define POW_SF2_ZERO 200 ///< ff_aac_pow2sf_tab index corresponding to pow(2, 0);
94
95 #define NOISE_PRE 256 ///< preamble for NOISE_BT, put in bitstream with the first noise band
96 #define NOISE_PRE_BITS 9 ///< length of preamble
97 #define NOISE_OFFSET 90 ///< subtracted from global gain, used as offset for the preamble
98
99 typedef struct Pulse {
100 int num_pulse;
101 int start;
102 int pos[4];
103 int amp[4];
104 } Pulse;
105
106 64 static inline int ff_aac_sample_rate_idx(int rate)
107 {
108
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 37 else if (11502 <= rate) return 9;
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 37 else if (9391 <= rate) return 10;
119 37 else return 11;
120 }
121
122 #endif /* AVCODEC_AAC_H */
123