FFmpeg
aacenc.h
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1 /*
2  * AAC encoder
3  * Copyright (C) 2008 Konstantin Shishkov
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #ifndef AVCODEC_AACENC_H
23 #define AVCODEC_AACENC_H
24 
25 #include <stdint.h>
26 
28 #include "libavutil/float_dsp.h"
29 #include "libavutil/mem_internal.h"
30 #include "libavutil/tx.h"
31 
32 #include "avcodec.h"
33 #include "put_bits.h"
34 
35 #include "aac.h"
36 #include "aacencdsp.h"
37 #include "audio_frame_queue.h"
38 #include "psymodel.h"
39 
40 #include "lpc.h"
41 
42 #define CLIP_AVOIDANCE_FACTOR 0.95f
43 
44 typedef enum AACCoder {
48 
50 }AACCoder;
51 
52 /**
53  * Predictor State
54  */
55 typedef struct PredictorState {
56  float cor0;
57  float cor1;
58  float var0;
59  float var1;
60  float r0;
61  float r1;
62  float k1;
63  float x_est;
65 
66 typedef struct AACEncOptions {
67  int coder;
68  int pns;
69  int tns;
70  int ltp;
71  int pce;
72  int pred;
73  int mid_side;
76 
77 /**
78  * Long Term Prediction
79  */
80 typedef struct LongTermPrediction {
81  int8_t present;
82  int16_t lag;
83  int coef_idx;
84  float coef;
85  int8_t used[MAX_LTP_LONG_SFB];
87 
88 /**
89  * Individual Channel Stream
90  */
91 typedef struct IndividualChannelStream {
92  uint8_t max_sfb; ///< number of scalefactor bands per group
94  uint8_t use_kb_window[2]; ///< If set, use Kaiser-Bessel window, otherwise use a sine window.
95  uint8_t group_len[8];
97  const uint16_t *swb_offset; ///< table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window
98  const uint8_t *swb_sizes; ///< table of scalefactor band sizes for a particular window
99  int num_swb; ///< number of scalefactor window bands
100  int num_windows;
101  int tns_max_bands;
102  int predictor_present;
105  int predictor_reset_count[31]; ///< used to count prediction resets
106  uint8_t prediction_used[41];
107  uint8_t window_clipping[8]; ///< set if a certain window is near clipping
108  float clip_avoidance_factor; ///< set if any window is near clipping to the necessary atennuation factor to avoid it
110 
111 /**
112  * Temporal Noise Shaping
113  */
114 typedef struct TemporalNoiseShaping {
115  int present;
116  int n_filt[8];
117  int length[8][4];
118  int direction[8][4];
119  int order[8][4];
121  float coef[8][4][TNS_MAX_ORDER];
123 
124 /**
125  * Single Channel Element - used for both SCE and LFE elements.
126  */
127 typedef struct SingleChannelElement {
131  enum BandType band_type[128]; ///< band types
132  enum BandType band_alt[128]; ///< alternative band type
133  int sf_idx[128]; ///< scalefactor indices
134  uint8_t zeroes[128]; ///< band is not coded
135  uint8_t can_pns[128]; ///< band is allowed to PNS (informative)
136  float is_ener[128]; ///< Intensity stereo pos
137  float pns_ener[128]; ///< Noise energy values
138  DECLARE_ALIGNED(32, float, pcoeffs)[1024]; ///< coefficients for IMDCT, pristine
139  DECLARE_ALIGNED(32, float, coeffs)[1024]; ///< coefficients for IMDCT, maybe processed
140  DECLARE_ALIGNED(32, float, ret_buf)[2048]; ///< PCM output buffer
141  DECLARE_ALIGNED(16, float, ltp_state)[3072]; ///< time signal for LTP
142  DECLARE_ALIGNED(32, float, lcoeffs)[1024]; ///< MDCT of LTP coefficients
143  DECLARE_ALIGNED(32, float, prcoeffs)[1024]; ///< Main prediction coefs
146 
147 /**
148  * channel element - generic struct for SCE/CPE/CCE/LFE
149  */
150 typedef struct ChannelElement {
151  // CPE specific
152  int common_window; ///< Set if channels share a common 'IndividualChannelStream' in bitstream.
153  int ms_mode; ///< Signals mid/side stereo flags coding mode
154  uint8_t is_mode; ///< Set if any bands have been encoded using intensity stereo
155  uint8_t ms_mask[128]; ///< Set if mid/side stereo is used for each scalefactor window band
156  uint8_t is_mask[128]; ///< Set if intensity stereo is used
157  // shared
160 
161 struct AACEncContext;
162 
163 typedef struct AACCoefficientsEncoder {
165  SingleChannelElement *sce, const float lambda);
167  int win, int group_len, const float lambda);
168  void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, float *out, int size,
169  int scale_idx, int cb, const float lambda, int rtz);
171  void (*encode_ltp_info)(struct AACEncContext *s, SingleChannelElement *sce, int common_window);
183  void (*search_for_ltp)(struct AACEncContext *s, SingleChannelElement *sce, int common_window);
188 
190 
192  float rd;
193  float energy;
194  int bits;
195  char cb;
196  char rtz;
197  uint16_t generation;
199 
200 typedef struct AACPCEInfo {
202  int num_ele[4]; ///< front, side, back, lfe
203  int pairing[3][8]; ///< front, side, back
204  int index[4][8]; ///< front, side, back, lfe
205  uint8_t config_map[16]; ///< configs the encoder's channel specific settings
206  uint8_t reorder_map[16]; ///< maps channels from lavc to aac order
207 } AACPCEInfo;
208 
209 /**
210  * AAC encoder context
211  */
212 typedef struct AACEncContext {
214  AACEncOptions options; ///< encoding options
216  AVTXContext *mdct1024; ///< long (1024 samples) frame transform context
218  AVTXContext *mdct128; ///< short (128 samples) frame transform context
221  AACPCEInfo pce; ///< PCE data, if needed
222  float *planar_samples[16]; ///< saved preprocessed input
223 
224  int profile; ///< copied from avctx
225  int needs_pce; ///< flag for non-standard layout
226  LPCContext lpc; ///< used by TNS
227  int samplerate_index; ///< MPEG-4 samplerate index
228  int channels; ///< channel count
229  const uint8_t *reorder_map; ///< lavc to aac reorder map
230  const uint8_t *chan_map; ///< channel configuration map
231 
232  ChannelElement *cpe; ///< channel elements
236  int cur_channel; ///< current channel for coder context
238  float lambda;
239  int last_frame_pb_count; ///< number of bits for the previous frame
240  float lambda_sum; ///< sum(lambda), for Qvg reporting
241  int lambda_count; ///< count(lambda), for Qvg reporting
242  enum RawDataBlockType cur_type; ///< channel group type cur_channel belongs to
243 
245  DECLARE_ALIGNED(32, int, qcoefs)[96]; ///< quantized coefficients
246  DECLARE_ALIGNED(32, float, scoefs)[1024]; ///< scaled coefficients
247 
249  AACQuantizeBandCostCacheEntry quantize_band_cost_cache[256][128]; ///< memoization area for quantize_band_cost
250 
252 
253  struct {
254  float *samples;
255  } buffer;
256 } AACEncContext;
257 
259 
260 
261 #endif /* AVCODEC_AACENC_H */
AACQuantizeBandCostCacheEntry
Definition: aacenc.h:191
SingleChannelElement::band_alt
enum BandType band_alt[128]
alternative band type
Definition: aacenc.h:132
AACCoefficientsEncoder::apply_tns_filt
void(* apply_tns_filt)(struct AACEncContext *s, SingleChannelElement *sce)
Definition: aacenc.h:176
AACEncOptions::ltp
int ltp
Definition: aacenc.h:70
AACCoefficientsEncoder::encode_window_bands_info
void(* encode_window_bands_info)(struct AACEncContext *s, SingleChannelElement *sce, int win, int group_len, const float lambda)
Definition: aacenc.h:166
SingleChannelElement::lcoeffs
float lcoeffs[1024]
MDCT of LTP coefficients.
Definition: aacenc.h:142
AACEncContext::planar_samples
float * planar_samples[16]
saved preprocessed input
Definition: aacenc.h:222
AACCoefficientsEncoder::search_for_quantizers
void(* search_for_quantizers)(AVCodecContext *avctx, struct AACEncContext *s, SingleChannelElement *sce, const float lambda)
Definition: aacenc.h:164
SingleChannelElement::predictor_state
struct PredictorState * predictor_state
Definition: aacdec.h:224
AACQuantizeBandCostCacheEntry::cb
char cb
Definition: aacenc.h:195
SingleChannelElement::can_pns
uint8_t can_pns[128]
band is allowed to PNS (informative)
Definition: aacenc.h:135
AACEncContext::needs_pce
int needs_pce
flag for non-standard layout
Definition: aacenc.h:225
SingleChannelElement::pulse
Pulse pulse
Definition: aacenc.h:130
mem_internal.h
AACEncOptions::coder
int coder
Definition: aacenc.h:67
out
FILE * out
Definition: movenc.c:55
cb
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:247
AACEncDSPContext
Definition: aacencdsp.h:28
AACEncContext::av_class
AVClass * av_class
Definition: aacenc.h:213
AVTXContext
Definition: tx_priv.h:235
SingleChannelElement::zeroes
uint8_t zeroes[128]
band is not coded
Definition: aacenc.h:134
LongTermPrediction::used
int8_t used[MAX_LTP_LONG_SFB]
Definition: aacdec.h:121
TemporalNoiseShaping::coef_idx
int coef_idx[8][4][TNS_MAX_ORDER]
Definition: aacenc.h:120
LongTermPrediction::coef
float coef
Definition: aacenc.h:84
AACCoefficientsEncoder::search_for_pns
void(* search_for_pns)(struct AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
Definition: aacenc.h:180
AACCoefficientsEncoder::search_for_ms
void(* search_for_ms)(struct AACEncContext *s, ChannelElement *cpe)
Definition: aacenc.h:184
AACEncContext::samplerate_index
int samplerate_index
MPEG-4 samplerate index.
Definition: aacenc.h:227
AACEncContext::aacdsp
AACEncDSPContext aacdsp
Definition: aacenc.h:251
MAX_PREDICTORS
#define MAX_PREDICTORS
Definition: aac.h:85
TemporalNoiseShaping::present
int present
Definition: aacdec.h:185
AACCoefficientsEncoder::search_for_tns
void(* search_for_tns)(struct AACEncContext *s, SingleChannelElement *sce)
Definition: aacenc.h:182
AAC_CODER_NB
@ AAC_CODER_NB
Definition: aacenc.h:49
lpc.h
AACQuantizeBandCostCacheEntry::generation
uint16_t generation
Definition: aacenc.h:197
AACCoefficientsEncoder::update_ltp
void(* update_ltp)(struct AACEncContext *s, SingleChannelElement *sce)
Definition: aacenc.h:177
ChannelElement::ch
SingleChannelElement ch[2]
Definition: aacdec.h:266
PredictorState::x_est
float x_est
Definition: aac_defines.h:138
AACEncContext::chan_map
const uint8_t * chan_map
channel configuration map
Definition: aacenc.h:230
AAC_CODER_FAST
@ AAC_CODER_FAST
Definition: aacenc.h:47
win
static float win(SuperEqualizerContext *s, float n, int N)
Definition: af_superequalizer.c:119
PredictorState::var1
float var1
Definition: aac_defines.h:134
IndividualChannelStream::num_swb
int num_swb
number of scalefactor window bands
Definition: aacdec.h:171
LPCContext
Definition: lpc.h:51
ff_quantize_band_cost_cache_init
void ff_quantize_band_cost_cache_init(struct AACEncContext *s)
Definition: aacenc.c:401
SingleChannelElement::coeffs
float coeffs[1024]
coefficients for IMDCT, maybe processed
Definition: aacenc.h:139
AACEncContext::psy
FFPsyContext psy
Definition: aacenc.h:233
SingleChannelElement::ret_buf
float ret_buf[2048]
PCM output buffer.
Definition: aacenc.h:140
ChannelElement::ms_mode
int ms_mode
Signals mid/side stereo flags coding mode.
Definition: aacenc.h:153
audio_frame_queue.h
IndividualChannelStream::window_clipping
uint8_t window_clipping[8]
set if a certain window is near clipping
Definition: aacdec.h:178
AACEncContext::options
AACEncOptions options
encoding options
Definition: aacenc.h:214
AACEncOptions::pce
int pce
Definition: aacenc.h:71
MAX_LTP_LONG_SFB
#define MAX_LTP_LONG_SFB
Definition: aac.h:37
AACPCEInfo::num_ele
int num_ele[4]
front, side, back, lfe
Definition: aacenc.h:202
SingleChannelElement::ics
IndividualChannelStream ics
Definition: aacdec.h:211
SingleChannelElement::prcoeffs
float prcoeffs[1024]
Main prediction coefs.
Definition: aacenc.h:143
AACEncContext::fdsp
AVFloatDSPContext * fdsp
Definition: aacenc.h:220
IndividualChannelStream::predictor_reset_count
int predictor_reset_count[31]
used to count prediction resets
Definition: aacenc.h:105
AACEncContext::lambda_count
int lambda_count
count(lambda), for Qvg reporting
Definition: aacenc.h:241
PredictorState::cor0
float cor0
Definition: aac_defines.h:131
IndividualChannelStream::clip_avoidance_factor
float clip_avoidance_factor
set if any window is near clipping to the necessary atennuation factor to avoid it
Definition: aacenc.h:108
av_tx_fn
void(* av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride)
Function pointer to a function to perform the transform.
Definition: tx.h:151
SingleChannelElement::ltp_state
float ltp_state[3072]
time signal for LTP
Definition: aacenc.h:141
AACEncContext::lambda_sum
float lambda_sum
sum(lambda), for Qvg reporting
Definition: aacenc.h:240
ff_aac_coders
const AACCoefficientsEncoder ff_aac_coders[]
Definition: aaccoder.c:1119
s
#define s(width, name)
Definition: cbs_vp9.c:198
IndividualChannelStream::swb_sizes
const uint8_t * swb_sizes
table of scalefactor band sizes for a particular window
Definition: aacenc.h:98
TemporalNoiseShaping::direction
int direction[8][4]
Definition: aacdec.h:188
AudioFrameQueue
Definition: audio_frame_queue.h:32
PredictorState
Predictor State.
Definition: aac_defines.h:130
AACEncContext::reorder_map
const uint8_t * reorder_map
lavc to aac reorder map
Definition: aacenc.h:229
LongTermPrediction::present
int8_t present
Definition: aacdec.h:118
IndividualChannelStream
Individual Channel Stream.
Definition: aacdec.h:162
AACCoefficientsEncoder::adjust_common_ltp
void(* adjust_common_ltp)(struct AACEncContext *s, ChannelElement *cpe)
Definition: aacenc.h:174
AACPCEInfo::reorder_map
uint8_t reorder_map[16]
maps channels from lavc to aac order
Definition: aacenc.h:206
AACQuantizeBandCostCacheEntry::energy
float energy
Definition: aacenc.h:193
AACCoefficientsEncoder::encode_ltp_info
void(* encode_ltp_info)(struct AACEncContext *s, SingleChannelElement *sce, int common_window)
Definition: aacenc.h:171
PutBitContext
Definition: put_bits.h:50
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:75
ChannelElement::is_mask
uint8_t is_mask[128]
Set if intensity stereo is used.
Definition: aacenc.h:156
SingleChannelElement::is_ener
float is_ener[128]
Intensity stereo pos.
Definition: aacenc.h:136
IndividualChannelStream::use_kb_window
uint8_t use_kb_window[2]
If set, use Kaiser-Bessel window, otherwise use a sine window.
Definition: aacdec.h:165
AACEncContext::cur_type
enum RawDataBlockType cur_type
channel group type cur_channel belongs to
Definition: aacenc.h:242
AACCoefficientsEncoder::search_for_pred
void(* search_for_pred)(struct AACEncContext *s, SingleChannelElement *sce)
Definition: aacenc.h:186
LongTermPrediction::coef_idx
int coef_idx
Definition: aacenc.h:83
ChannelElement::ms_mask
uint8_t ms_mask[128]
Set if mid/side stereo is used for each scalefactor window band.
Definition: aacdec.h:264
aac.h
IndividualChannelStream::predictor_present
int predictor_present
Definition: aacdec.h:174
AACEncContext::mdct128_fn
av_tx_fn mdct128_fn
Definition: aacenc.h:219
AACEncContext::random_state
int random_state
Definition: aacenc.h:237
AACCoefficientsEncoder::ltp_insert_new_frame
void(* ltp_insert_new_frame)(struct AACEncContext *s)
Definition: aacenc.h:178
TNS_MAX_ORDER
#define TNS_MAX_ORDER
Definition: aac.h:36
AACEncContext::quantize_band_cost_cache_generation
uint16_t quantize_band_cost_cache_generation
Definition: aacenc.h:248
AACCoefficientsEncoder::adjust_common_pred
void(* adjust_common_pred)(struct AACEncContext *s, ChannelElement *cpe)
Definition: aacenc.h:173
SingleChannelElement::sf_idx
int sf_idx[128]
scalefactor indices
Definition: aacenc.h:133
AACEncContext::qcoefs
int qcoefs[96]
quantized coefficients
Definition: aacenc.h:245
float_dsp.h
AACCoefficientsEncoder::apply_main_pred
void(* apply_main_pred)(struct AACEncContext *s, SingleChannelElement *sce)
Definition: aacenc.h:175
AACEncOptions::tns
int tns
Definition: aacenc.h:69
AACPCEInfo
Definition: aacenc.h:200
AACEncContext::samples
float * samples
Definition: aacenc.h:254
AAC_CODER_ANMR
@ AAC_CODER_ANMR
Definition: aacenc.h:45
IndividualChannelStream::window_sequence
enum WindowSequence window_sequence[2]
Definition: aacdec.h:164
AACCoefficientsEncoder::set_special_band_scalefactors
void(* set_special_band_scalefactors)(struct AACEncContext *s, SingleChannelElement *sce)
Definition: aacenc.h:179
AACEncContext::channels
int channels
channel count
Definition: aacenc.h:228
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:317
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:102
BandType
BandType
Definition: aac.h:66
size
int size
Definition: twinvq_data.h:10344
AACCoefficientsEncoder::quantize_and_encode_band
void(* quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, float *out, int size, int scale_idx, int cb, const float lambda, int rtz)
Definition: aacenc.h:168
FFPsyPreprocessContext
Definition: psymodel.c:93
AVFloatDSPContext
Definition: float_dsp.h:24
AAC_CODER_TWOLOOP
@ AAC_CODER_TWOLOOP
Definition: aacenc.h:46
ChannelElement::common_window
int common_window
Set if channels share a common 'IndividualChannelStream' in bitstream.
Definition: aacenc.h:152
AACCoefficientsEncoder::mark_pns
void(* mark_pns)(struct AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
Definition: aacenc.h:181
AACPCEInfo::index
int index[4][8]
front, side, back, lfe
Definition: aacenc.h:204
AACEncContext::mdct1024
AVTXContext * mdct1024
long (1024 samples) frame transform context
Definition: aacenc.h:216
SingleChannelElement::band_type
enum BandType band_type[128]
band types
Definition: aacdec.h:214
SingleChannelElement::pns_ener
float pns_ener[128]
Noise energy values.
Definition: aacenc.h:137
AACEncContext::cur_channel
int cur_channel
current channel for coder context
Definition: aacenc.h:236
AACCoder
AACCoder
Definition: aacenc.h:44
AACPCEInfo::config_map
uint8_t config_map[16]
configs the encoder's channel specific settings
Definition: aacenc.h:205
AACEncOptions::intensity_stereo
int intensity_stereo
Definition: aacenc.h:74
AACCoefficientsEncoder::encode_main_pred
void(* encode_main_pred)(struct AACEncContext *s, SingleChannelElement *sce)
Definition: aacenc.h:172
RawDataBlockType
RawDataBlockType
Definition: aac.h:39
SingleChannelElement
Single Channel Element - used for both SCE and LFE elements.
Definition: aacdec.h:210
IndividualChannelStream::num_windows
int num_windows
Definition: aacdec.h:172
AACQuantizeBandCostCacheEntry::rd
float rd
Definition: aacenc.h:192
AACCoefficientsEncoder::search_for_is
void(* search_for_is)(struct AACEncContext *s, AVCodecContext *avctx, ChannelElement *cpe)
Definition: aacenc.h:185
SingleChannelElement::pcoeffs
float pcoeffs[1024]
coefficients for IMDCT, pristine
Definition: aacenc.h:138
aacencdsp.h
ChannelElement
channel element - generic struct for SCE/CPE/CCE/LFE
Definition: aacdec.h:260
IndividualChannelStream::swb_offset
const uint16_t * swb_offset
table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular wind...
Definition: aacdec.h:170
AACPCEInfo::pairing
int pairing[3][8]
front, side, back
Definition: aacenc.h:203
AACQuantizeBandCostCacheEntry::bits
int bits
Definition: aacenc.h:194
LongTermPrediction::lag
int16_t lag
Definition: aacdec.h:119
TemporalNoiseShaping::order
int order[8][4]
Definition: aacdec.h:189
AACEncContext::quantize_band_cost_cache
AACQuantizeBandCostCacheEntry quantize_band_cost_cache[256][128]
memoization area for quantize_band_cost
Definition: aacenc.h:249
PredictorState::r1
float r1
Definition: aac_defines.h:136
IndividualChannelStream::tns_max_bands
int tns_max_bands
Definition: aacdec.h:173
AACEncContext::psypp
struct FFPsyPreprocessContext * psypp
Definition: aacenc.h:234
AACCoefficientsEncoder
Definition: aacenc.h:163
TemporalNoiseShaping::length
int length[8][4]
Definition: aacdec.h:187
AACEncOptions::pns
int pns
Definition: aacenc.h:68
avcodec.h
AACEncOptions::mid_side
int mid_side
Definition: aacenc.h:73
AACEncContext::profile
int profile
copied from avctx
Definition: aacenc.h:224
AACEncContext::lpc
LPCContext lpc
used by TNS
Definition: aacenc.h:226
PredictorState::var0
float var0
Definition: aac_defines.h:133
TemporalNoiseShaping::coef
float coef[8][4][TNS_MAX_ORDER]
Definition: aacenc.h:121
AACEncContext::afq
AudioFrameQueue afq
Definition: aacenc.h:244
SingleChannelElement::tns
TemporalNoiseShaping tns
Definition: aacdec.h:213
AACEncContext::pce
AACPCEInfo pce
PCE data, if needed.
Definition: aacenc.h:221
AACEncContext
AAC encoder context.
Definition: aacenc.h:212
PredictorState::r0
float r0
Definition: aac_defines.h:135
AACQuantizeBandCostCacheEntry::rtz
char rtz
Definition: aacenc.h:196
AACCoefficientsEncoder::encode_tns_info
void(* encode_tns_info)(struct AACEncContext *s, SingleChannelElement *sce)
Definition: aacenc.h:170
AACEncContext::last_frame_pb_count
int last_frame_pb_count
number of bits for the previous frame
Definition: aacenc.h:239
AVCodecContext
main external API structure.
Definition: avcodec.h:451
AACCoefficientsEncoder::search_for_ltp
void(* search_for_ltp)(struct AACEncContext *s, SingleChannelElement *sce, int common_window)
Definition: aacenc.h:183
AACEncContext::mdct128
AVTXContext * mdct128
short (128 samples) frame transform context
Definition: aacenc.h:218
AACEncContext::scoefs
float scoefs[1024]
scaled coefficients
Definition: aacenc.h:246
LongTermPrediction
Long Term Prediction.
Definition: aacdec.h:117
channel_layout.h
IndividualChannelStream::prediction_used
uint8_t prediction_used[41]
Definition: aacdec.h:177
TemporalNoiseShaping
Temporal Noise Shaping.
Definition: aacdec.h:184
ChannelElement::is_mode
uint8_t is_mode
Set if any bands have been encoded using intensity stereo.
Definition: aacenc.h:154
AACEncContext::coder
const AACCoefficientsEncoder * coder
Definition: aacenc.h:235
AACEncContext::pb
PutBitContext pb
Definition: aacenc.h:215
PredictorState::k1
float k1
Definition: aac_defines.h:137
IndividualChannelStream::max_sfb
uint8_t max_sfb
number of scalefactor bands per group
Definition: aacdec.h:163
AACEncOptions::pred
int pred
Definition: aacenc.h:72
Pulse
Definition: aac.h:99
AACEncContext::mdct1024_fn
av_tx_fn mdct1024_fn
Definition: aacenc.h:217
WindowSequence
WindowSequence
Definition: aac.h:59
IndividualChannelStream::ltp
LongTermPrediction ltp
Definition: aacdec.h:169
AACEncContext::lambda
float lambda
Definition: aacenc.h:238
put_bits.h
FFPsyContext
context used by psychoacoustic model
Definition: psymodel.h:89
IndividualChannelStream::group_len
uint8_t group_len[8]
Definition: aacdec.h:168
AACEncOptions
Definition: aacenc.h:66
psymodel.h
TemporalNoiseShaping::n_filt
int n_filt[8]
Definition: aacdec.h:186
PredictorState::cor1
float cor1
Definition: aac_defines.h:132
IndividualChannelStream::predictor_reset_group
int predictor_reset_group
Definition: aacdec.h:176
tx.h
AACEncContext::cpe
ChannelElement * cpe
channel elements
Definition: aacenc.h:232
AACEncContext::buffer
struct AACEncContext::@31 buffer
AACPCEInfo::layout
AVChannelLayout layout
Definition: aacenc.h:201
IndividualChannelStream::predictor_initialized
int predictor_initialized
Definition: aacdec.h:175