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 "avcodec.h"
34 #include "dsputil.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 
118 typedef struct {
119  float cor0;
120  float cor1;
121  float var0;
122  float var1;
123  float r0;
124  float r1;
126 
127 #define MAX_PREDICTORS 672
128 
129 #define SCALE_DIV_512 36
130 #define SCALE_ONE_POS 140
131 #define SCALE_MAX_POS 255
132 #define SCALE_MAX_DIFF 60
133 #define SCALE_DIFF_ZERO 60
134 #define POW_SF2_ZERO 200
135 
136 
139 typedef struct {
140  int8_t present;
141  int16_t lag;
142  float coef;
143  int8_t used[MAX_LTP_LONG_SFB];
145 
149 typedef struct {
150  uint8_t max_sfb;
151  enum WindowSequence window_sequence[2];
152  uint8_t use_kb_window[2];
154  uint8_t group_len[8];
156  const uint16_t *swb_offset;
157  const uint8_t *swb_sizes;
158  int num_swb;
164  uint8_t prediction_used[41];
166 
170 typedef struct {
171  int present;
172  int n_filt[8];
173  int length[8][4];
174  int direction[8][4];
175  int order[8][4];
176  float coef[8][4][TNS_MAX_ORDER];
178 
182 typedef struct {
184  int dyn_rng_sgn[17];
185  int dyn_rng_ctl[17];
186  int exclude_mask[MAX_CHANNELS];
187  int band_incr;
189  int band_top[17];
194 
195 typedef struct {
197  int start;
198  int pos[4];
199  int amp[4];
200 } Pulse;
201 
205 typedef struct {
206  enum CouplingPoint coupling_point;
208  enum RawDataBlockType type[8];
209  int id_select[8];
210  int ch_select[8];
213  float gain[16][120];
215 
219 typedef struct {
223  enum BandType band_type[128];
224  int band_type_run_end[120];
225  float sf[120];
226  int sf_idx[128];
227  uint8_t zeroes[128];
228  DECLARE_ALIGNED(32, float, coeffs)[1024];
229  DECLARE_ALIGNED(32, float, saved)[1024];
230  DECLARE_ALIGNED(32, float, ret)[2048];
231  DECLARE_ALIGNED(16, float, ltp_state)[3072];
232  PredictorState predictor_state[MAX_PREDICTORS];
234 
238 typedef struct {
239  // CPE specific
241  int ms_mode;
242  uint8_t ms_mask[128];
243  // shared
245  // CCE specific
249 
253 typedef struct {
256 
258 
259  int is_saved;
261 
266  enum ChannelPosition che_pos[4][MAX_ELEM_ID];
270  ChannelElement *tag_che_map[4][MAX_ELEM_ID];
279  DECLARE_ALIGNED(32, float, buf_mdct)[1024];
299 
301  DECLARE_ALIGNED(32, float, temp)[128];
302 
303  enum OCStatus output_configured;
304 } AACContext;
305 
306 #endif /* AVCODEC_AAC_H */
int predictor_initialized
Definition: aac.h:162
static const int16_t coeffs[28]
Definition: aac.h:53
Audio Video Frame.
Definition: avcodec.h:985
AVCodecContext * avctx
Definition: aac.h:254
Definition: aac.h:195
Definition: aac.h:56
Definition: aac.h:49
Definition: aac.h:50
float cor1
Definition: aac.h:120
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:55
int common_window
Set if channels share a common 'IndividualChannelStream' in bitstream.
Definition: aac.h:240
#define MAX_LTP_LONG_SFB
Definition: aac.h:46
Dynamic Range Control - decoded from the bitstream but not processed further.
Definition: aac.h:182
MPEG4AudioConfig m4ac
Definition: aac.h:257
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:187
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:156
Definition: aac.h:60
BandType
Definition: aac.h:75
Output configuration under trial specified by an inband PCE.
Definition: aac.h:109
Definition: aac.h:52
TemporalNoiseShaping tns
Definition: aac.h:221
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:207
FFTContext mdct_ltp
Definition: aac.h:288
Scalefactor data are intensity stereo positions.
Definition: aac.h:81
DSPContext dsp
Definition: aac.h:289
Output configuration set in a global header but not yet locked.
Definition: aac.h:111
int random_state
Definition: aac.h:291
float var1
Definition: aac.h:122
SpectralBandReplication sbr
Definition: aac.h:247
FFTContext mdct_small
Definition: aac.h:287
FmtConvertContext fmt_conv
Definition: aac.h:290
ExtensionPayloadID
Definition: aac.h:59
Spectral Band Replication definitions and structures.
uint8_t max_sfb
number of scalefactor bands per group
Definition: aac.h:150
Definition: aac.h:55
WindowSequence
Definition: aac.h:68
int num_swb
number of scalefactor window bands
Definition: aac.h:158
int prog_ref_level
A reference level for the long-term program audio level for all channels combined.
Definition: aac.h:190
struct AACContext AACContext
Output configuration locked in place.
Definition: aac.h:112
Predictor State.
Definition: aac.h:118
Definition: fft.h:62
int predictor_reset_group
Definition: aac.h:163
float var0
Definition: aac.h:121
int pce_instance_tag
Indicates with which program the DRC info is associated.
Definition: aac.h:183
int interpolation_scheme
Indicates the interpolation scheme used in the SBR QMF domain.
Definition: aac.h:188
coupling parameters
Definition: aac.h:205
int tags_mapped
Definition: aac.h:271
static int output_data(MLPDecodeContext *m, unsigned int substr, void *data, int *got_frame_ptr)
Write the audio data into the output buffer.
Definition: mlpdec.c:918
float coef
Definition: aac.h:142
int is_saved
Set if elements have stored overlap from previous frame.
Definition: aac.h:259
external API header
Temporal Noise Shaping.
Definition: aac.h:170
Long Term Prediction.
Definition: aac.h:139
main external API structure.
Definition: avcodec.h:1329
IndividualChannelStream ics
Definition: aac.h:220
#define MAX_PREDICTORS
Definition: aac.h:127
#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:157
OCStatus
Output configuration status.
Definition: aac.h:107
#define MAX_CHANNELS
Definition: aac.h:42
#define TNS_MAX_ORDER
Definition: aac.h:45
LongTermPrediction ltp
Definition: aac.h:155
ChannelCoupling coup
Definition: aac.h:246
int ms_mode
Signals mid/side stereo flags coding mode (used by encoder)
Definition: aac.h:241
Output configuration under trial specified by a frame header.
Definition: aac.h:110
Scalefactor data are intensity stereo positions.
Definition: aac.h:80
int16_t lag
Definition: aac.h:141
DynamicRangeControl che_drc
Definition: aac.h:260
Single Channel Element - used for both SCE and LFE elements.
Definition: aac.h:219
Definition: aac.h:54
Individual Channel Stream.
Definition: aac.h:149
DSP utils.
channel element - generic struct for SCE/CPE/CCE/LFE
Definition: aac.h:238
int start
Definition: aac.h:197
float r1
Definition: aac.h:124
Scalefactors and spectral data are all zero.
Definition: aac.h:76
int num_pulse
Definition: aac.h:196
float cor0
Definition: aac.h:119
AVFrame frame
Definition: aac.h:255
FFTContext mdct
Definition: aac.h:286
float r0
Definition: aac.h:123
int8_t present
Definition: aac.h:140
Definition: aac.h:99
Spectral Band Replication.
Definition: sbr.h:112
DSPContext.
Definition: dsputil.h:226
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