Libav
aac.h
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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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
30 #ifndef AVCODEC_AAC_H
31 #define AVCODEC_AAC_H
32 
33 #include "libavutil/float_dsp.h"
34 #include "avcodec.h"
35 #include "fft.h"
36 #include "mpeg4audio.h"
37 #include "sbr.h"
38 #include "fmtconvert.h"
39 
40 #include <stdint.h>
41 
42 #define MAX_CHANNELS 64
43 #define MAX_ELEM_ID 16
44 
45 #define TNS_MAX_ORDER 20
46 #define MAX_LTP_LONG_SFB 40
47 
57 };
58 
64  EXT_SBR_DATA = 0xd,
66 };
67 
73 };
74 
75 enum BandType {
76  ZERO_BT = 0,
78  ESC_BT = 11,
79  NOISE_BT = 13,
81  INTENSITY_BT = 15,
82 };
83 
84 #define IS_CODEBOOK_UNSIGNED(x) ((x - 1) & 10)
85 
93 };
94 
102 };
103 
107 enum OCStatus {
113 };
114 
115 typedef struct OutputConfiguration {
119  int channels;
120  uint64_t channel_layout;
123 
127 typedef struct PredictorState {
128  float cor0;
129  float cor1;
130  float var0;
131  float var1;
132  float r0;
133  float r1;
135 
136 #define MAX_PREDICTORS 672
137 
138 #define SCALE_DIV_512 36
139 #define SCALE_ONE_POS 140
140 #define SCALE_MAX_POS 255
141 #define SCALE_MAX_DIFF 60
142 #define SCALE_DIFF_ZERO 60
143 
144 
147 typedef struct LongTermPrediction {
148  int8_t present;
149  int16_t lag;
150  float coef;
151  int8_t used[MAX_LTP_LONG_SFB];
153 
157 typedef struct IndividualChannelStream {
159  enum WindowSequence window_sequence[2];
160  uint8_t use_kb_window[2];
162  uint8_t group_len[8];
164  const uint16_t *swb_offset;
166  int num_swb;
172  uint8_t prediction_used[41];
174 
178 typedef struct TemporalNoiseShaping {
179  int present;
180  int n_filt[8];
181  int length[8][4];
182  int direction[8][4];
183  int order[8][4];
184  float coef[8][4][TNS_MAX_ORDER];
186 
190 typedef struct DynamicRangeControl {
192  int dyn_rng_sgn[17];
193  int dyn_rng_ctl[17];
194  int exclude_mask[MAX_CHANNELS];
195  int band_incr;
197  int band_top[17];
202 
203 typedef struct Pulse {
205  int start;
206  int pos[4];
207  int amp[4];
208 } Pulse;
209 
213 typedef struct ChannelCoupling {
214  enum CouplingPoint coupling_point;
216  enum RawDataBlockType type[8];
217  int id_select[8];
218  int ch_select[8];
221  float gain[16][120];
223 
227 typedef struct SingleChannelElement {
231  enum BandType band_type[128];
232  int band_type_run_end[120];
233  float sf[120];
234  int sf_idx[128];
235  uint8_t zeroes[128];
236  DECLARE_ALIGNED(32, float, coeffs)[1024];
237  DECLARE_ALIGNED(32, float, saved)[1536];
238  DECLARE_ALIGNED(32, float, ret_buf)[2048];
239  DECLARE_ALIGNED(16, float, ltp_state)[3072];
240  PredictorState predictor_state[MAX_PREDICTORS];
241  float *ret;
243 
247 typedef struct ChannelElement {
248  // CPE specific
250  int ms_mode;
251  uint8_t ms_mask[128];
252  // shared
254  // CCE specific
258 
262 typedef struct AACContext {
265 
266  int is_saved;
268 
274  ChannelElement *tag_che_map[4][MAX_ELEM_ID];
283  DECLARE_ALIGNED(32, float, buf_mdct)[1024];
304 
306  DECLARE_ALIGNED(32, float, temp)[128];
307 
309 } AACContext;
310 
311 #endif /* AVCODEC_AAC_H */
int predictor_initialized
Definition: aac.h:170
Definition: aac.h:53
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
AVCodecContext * avctx
Definition: aac.h:263
Definition: aac.h:203
Definition: aac.h:56
Definition: aac.h:49
Definition: aac.h:50
float cor1
Definition: aac.h:129
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:58
int common_window
Set if channels share a common &#39;IndividualChannelStream&#39; in bitstream.
Definition: aac.h:249
uint64_t channel_layout
Definition: aac.h:120
#define MAX_LTP_LONG_SFB
Definition: aac.h:46
Dynamic Range Control - decoded from the bitstream but not processed further.
Definition: aac.h:190
ChannelPosition
Definition: aac.h:86
Spectral data are scaled white noise not coded in the bitstream.
Definition: aac.h:79
Definition: aac.h:51
int band_incr
Number of DRC bands greater than 1 having DRC info.
Definition: aac.h:195
const uint16_t * swb_offset
table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular wind...
Definition: aac.h:164
Definition: aac.h:60
BandType
Definition: aac.h:75
uint8_t
uint8_t layout_map[MAX_ELEM_ID *4][3]
Definition: aac.h:117
Output configuration under trial specified by an inband PCE.
Definition: aac.h:109
Definition: aac.h:52
TemporalNoiseShaping tns
Definition: aac.h:229
CouplingPoint
The point during decoding at which channel coupling is applied.
Definition: aac.h:98
int num_coupled
number of target elements
Definition: aac.h:215
FFTContext mdct_ltp
Definition: aac.h:293
Scalefactor data are intensity stereo positions.
Definition: aac.h:81
Output configuration set in a global header but not yet locked.
Definition: aac.h:111
int random_state
Definition: aac.h:296
float var1
Definition: aac.h:131
MPEG4AudioConfig m4ac
Definition: aac.h:116
SpectralBandReplication sbr
Definition: aac.h:256
FFTContext mdct_small
Definition: aac.h:291
FmtConvertContext fmt_conv
Definition: aac.h:294
ExtensionPayloadID
Definition: aac.h:59
Spectral Band Replication definitions and structures.
uint8_t max_sfb
number of scalefactor bands per group
Definition: aac.h:158
Definition: aac.h:55
WindowSequence
Definition: aac.h:68
int num_swb
number of scalefactor window bands
Definition: aac.h:166
int prog_ref_level
A reference level for the long-term program audio level for all channels combined.
Definition: aac.h:198
Output configuration locked in place.
Definition: aac.h:112
Predictor State.
Definition: aac.h:127
AVFloatDSPContext fdsp
Definition: aac.h:295
Definition: fft.h:73
int predictor_reset_group
Definition: aac.h:171
float var0
Definition: aac.h:130
FFTContext mdct_ld
Definition: aac.h:292
int pce_instance_tag
Indicates with which program the DRC info is associated.
Definition: aac.h:191
int interpolation_scheme
Indicates the interpolation scheme used in the SBR QMF domain.
Definition: aac.h:196
coupling parameters
Definition: aac.h:213
int tags_mapped
Definition: aac.h:275
float coef
Definition: aac.h:150
int is_saved
Set if elements have stored overlap from previous frame.
Definition: aac.h:266
Libavcodec external API header.
Temporal Noise Shaping.
Definition: aac.h:178
Long Term Prediction.
Definition: aac.h:147
main external API structure.
Definition: avcodec.h:1050
IndividualChannelStream ics
Definition: aac.h:228
#define MAX_PREDICTORS
Definition: aac.h:136
#define MAX_ELEM_ID
Definition: aac.h:43
Spectral data are coded with an escape sequence.
Definition: aac.h:78
const uint8_t * swb_sizes
table of scalefactor band sizes for a particular window
Definition: aac.h:165
OCStatus
Output configuration status.
Definition: aac.h:107
#define MAX_CHANNELS
Definition: aac.h:42
float * ret
PCM output.
Definition: aac.h:241
#define TNS_MAX_ORDER
Definition: aac.h:45
main AAC context
Definition: aac.h:262
LongTermPrediction ltp
Definition: aac.h:163
ChannelCoupling coup
Definition: aac.h:255
int ms_mode
Signals mid/side stereo flags coding mode (used by encoder)
Definition: aac.h:250
Output configuration under trial specified by a frame header.
Definition: aac.h:110
enum OCStatus status
Definition: aac.h:121
Scalefactor data are intensity stereo positions.
Definition: aac.h:80
int16_t lag
Definition: aac.h:149
DynamicRangeControl che_drc
Definition: aac.h:267
AVFrame * frame
Definition: aac.h:264
Single Channel Element - used for both SCE and LFE elements.
Definition: aac.h:227
Definition: aac.h:54
Individual Channel Stream.
Definition: aac.h:157
channel element - generic struct for SCE/CPE/CCE/LFE
Definition: aac.h:247
int start
Definition: aac.h:205
float r1
Definition: aac.h:133
Scalefactors and spectral data are all zero.
Definition: aac.h:76
int num_pulse
Definition: aac.h:204
float cor0
Definition: aac.h:128
FFTContext mdct
Definition: aac.h:290
float r0
Definition: aac.h:132
int8_t present
Definition: aac.h:148
Definition: aac.h:99
Spectral Band Replication.
Definition: sbr.h:114
int layout_map_tags
Definition: aac.h:118
Output unconfigured.
Definition: aac.h:108
This and later band types encode two values (rather than four) with one code word.
Definition: aac.h:77
RawDataBlockType
Definition: aac.h:48