FFmpeg  4.4.5
ac3enc.h
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1 /*
2  * AC-3 encoder & E-AC-3 encoder common header
3  * Copyright (c) 2000 Fabrice Bellard
4  * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@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  * AC-3 encoder & E-AC-3 encoder common header
26  */
27 
28 #ifndef AVCODEC_AC3ENC_H
29 #define AVCODEC_AC3ENC_H
30 
31 #include <stdint.h>
32 
33 #include "ac3.h"
34 #include "ac3dsp.h"
35 #include "avcodec.h"
36 #include "fft.h"
37 #include "mathops.h"
38 #include "me_cmp.h"
39 #include "put_bits.h"
40 #include "audiodsp.h"
41 
42 #ifndef AC3ENC_FLOAT
43 #define AC3ENC_FLOAT 0
44 #endif
45 
46 #if AC3ENC_FLOAT
47 #include "libavutil/float_dsp.h"
48 #define AC3_NAME(x) ff_ac3_float_ ## x
49 #define MAC_COEF(d,a,b) ((d)+=(a)*(b))
50 #define COEF_MIN (-16777215.0/16777216.0)
51 #define COEF_MAX ( 16777215.0/16777216.0)
52 #define NEW_CPL_COORD_THRESHOLD 0.03
53 typedef float SampleType;
54 typedef float CoefType;
55 typedef float CoefSumType;
56 #else
57 #include "libavutil/fixed_dsp.h"
58 #define AC3_NAME(x) ff_ac3_fixed_ ## x
59 #define MAC_COEF(d,a,b) MAC64(d,a,b)
60 #define COEF_MIN -16777215
61 #define COEF_MAX 16777215
62 #define NEW_CPL_COORD_THRESHOLD 503317
64 typedef int32_t CoefType;
66 #endif
67 
68 /* common option values */
69 #define AC3ENC_OPT_NONE -1
70 #define AC3ENC_OPT_AUTO -1
71 #define AC3ENC_OPT_OFF 0
72 #define AC3ENC_OPT_ON 1
73 #define AC3ENC_OPT_NOT_INDICATED 0
74 #define AC3ENC_OPT_MODE_ON 2
75 #define AC3ENC_OPT_MODE_OFF 1
76 #define AC3ENC_OPT_DSUREX_DPLIIZ 3
77 
78 /* specific option values */
79 #define AC3ENC_OPT_LARGE_ROOM 1
80 #define AC3ENC_OPT_SMALL_ROOM 2
81 #define AC3ENC_OPT_DOWNMIX_LTRT 1
82 #define AC3ENC_OPT_DOWNMIX_LORO 2
83 #define AC3ENC_OPT_DOWNMIX_DPLII 3 // reserved value in A/52, but used by encoders to indicate DPL2
84 #define AC3ENC_OPT_ADCONV_STANDARD 0
85 #define AC3ENC_OPT_ADCONV_HDCD 1
86 
87 
88 /**
89  * Encoding Options used by AVOption.
90  */
91 typedef struct AC3EncOptions {
92  /* AC-3 metadata options*/
102  int original;
115 
116  /* other encoding options */
121 } AC3EncOptions;
122 
123 /**
124  * Data for a single audio block.
125  */
126 typedef struct AC3Block {
127  CoefType **mdct_coef; ///< MDCT coefficients
128  int32_t **fixed_coef; ///< fixed-point MDCT coefficients
129  uint8_t **exp; ///< original exponents
130  uint8_t **grouped_exp; ///< grouped exponents
131  int16_t **psd; ///< psd per frequency bin
132  int16_t **band_psd; ///< psd per critical band
133  int16_t **mask; ///< masking curve
134  uint16_t **qmant; ///< quantized mantissas
135  uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp)
136  uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant)
137  uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block
138  int num_rematrixing_bands; ///< number of rematrixing bands
139  uint8_t rematrixing_flags[4]; ///< rematrixing flags
140  int new_cpl_strategy; ///< send new coupling strategy
141  int cpl_in_use; ///< coupling in use for this block (cplinu)
142  uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl)
143  int num_cpl_channels; ///< number of channels in coupling
144  uint8_t new_cpl_coords[AC3_MAX_CHANNELS]; ///< send new coupling coordinates (cplcoe)
145  uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco)
146  int new_snr_offsets; ///< send new SNR offsets
147  int new_cpl_leak; ///< send new coupling leak info
148  int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant)
149 } AC3Block;
150 
151 /**
152  * AC-3 encoder private context.
153  */
154 typedef struct AC3EncodeContext {
155  AVClass *av_class; ///< AVClass used for AVOption
156  AC3EncOptions options; ///< encoding options
157  AVCodecContext *avctx; ///< parent AVCodecContext
158  PutBitContext pb; ///< bitstream writer context
160 #if AC3ENC_FLOAT
162 #else
164 #endif
166  AC3DSPContext ac3dsp; ///< AC-3 optimized functions
167  FFTContext mdct; ///< FFT context for MDCT calculation
168  const SampleType *mdct_window; ///< MDCT window function array
169 
170  AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info
171 
172  int fixed_point; ///< indicates if fixed-point encoder is being used
173  int eac3; ///< indicates if this is E-AC-3 vs. AC-3
174  int bitstream_id; ///< bitstream id (bsid)
175  int bitstream_mode; ///< bitstream mode (bsmod)
176 
177  int bit_rate; ///< target bit rate, in bits-per-second
178  int sample_rate; ///< sampling frequency, in Hz
179 
180  int num_blks_code; ///< number of blocks code (numblkscod)
181  int num_blocks; ///< number of blocks per frame
182  int frame_size_min; ///< minimum frame size in case rounding is necessary
183  int frame_size; ///< current frame size in bytes
184  int frame_size_code; ///< frame size code (frmsizecod)
185  uint16_t crc_inv[2];
186  int64_t bits_written; ///< bit count (used to avg. bitrate)
187  int64_t samples_written; ///< sample count (used to avg. bitrate)
188 
189  int fbw_channels; ///< number of full-bandwidth channels (nfchans)
190  int channels; ///< total number of channels (nchans)
191  int lfe_on; ///< indicates if there is an LFE channel (lfeon)
192  int lfe_channel; ///< channel index of the LFE channel
193  int has_center; ///< indicates if there is a center channel
194  int has_surround; ///< indicates if there are one or more surround channels
195  int channel_mode; ///< channel mode (acmod)
196  const uint8_t *channel_map; ///< channel map used to reorder channels
197 
198  int center_mix_level; ///< center mix level code
199  int surround_mix_level; ///< surround mix level code
200  int ltrt_center_mix_level; ///< Lt/Rt center mix level code
201  int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code
202  int loro_center_mix_level; ///< Lo/Ro center mix level code
203  int loro_surround_mix_level; ///< Lo/Ro surround mix level code
204 
205  int cutoff; ///< user-specified cutoff frequency, in Hz
206  int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod)
207  int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant)
208  int cpl_end_freq; ///< coupling channel end frequency bin
209 
210  int cpl_on; ///< coupling turned on for this frame
211  int cpl_enabled; ///< coupling enabled for all frames
212  int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd)
213  int num_cpl_bands; ///< number of coupling bands (ncplbnd)
214  uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band
215 
216  int rematrixing_enabled; ///< stereo rematrixing enabled
217 
218  /* bitrate allocation control */
219  int slow_gain_code; ///< slow gain code (sgaincod)
220  int slow_decay_code; ///< slow decay code (sdcycod)
221  int fast_decay_code; ///< fast decay code (fdcycod)
222  int db_per_bit_code; ///< dB/bit code (dbpbcod)
223  int floor_code; ///< floor code (floorcod)
224  AC3BitAllocParameters bit_alloc; ///< bit allocation parameters
225  int coarse_snr_offset; ///< coarse SNR offsets (csnroffst)
226  int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod)
227  int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst)
228  int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters
229  int frame_bits; ///< all frame bits except exponents and mantissas
230  int exponent_bits; ///< number of bits used for exponents
231 
240  int16_t *psd_buffer;
241  int16_t *band_psd_buffer;
242  int16_t *mask_buffer;
243  int16_t *qmant_buffer;
246 
248  uint8_t frame_exp_strategy[AC3_MAX_CHANNELS]; ///< frame exp strategy index
249  int use_frame_exp_strategy; ///< indicates use of frame exp strategy
250  uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE
251  uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap)
252  int ref_bap_set; ///< indicates if ref_bap pointers have been set
253 
255 
256  /* fixed vs. float function pointers */
259 
260  /* fixed vs. float templated function pointers */
262 
263  /* AC-3 vs. E-AC-3 function pointers */
266 
267 
268 extern const uint64_t ff_ac3_channel_layouts[19];
269 extern const AVOption ff_ac3_enc_options[];
270 extern const AVCodecDefault ff_ac3_enc_defaults[];
271 
274 
276 
278 
280 
282 
284  const AVFrame *frame, int *got_packet_ptr);
285 
286 /* prototypes for functions in ac3enc_template.c */
287 
289  const AVFrame *frame, int *got_packet_ptr);
291  const AVFrame *frame, int *got_packet_ptr);
292 
293 #endif /* AVCODEC_AC3ENC_H */
Common code between the AC-3 encoder and decoder.
#define AC3_MAX_CHANNELS
maximum number of channels, including coupling channel
Definition: ac3.h:31
#define AC3_MAX_BLOCKS
Definition: ac3.h:36
#define AC3_MAX_CPL_BANDS
Definition: ac3.h:40
int ff_ac3_encode_close(AVCodecContext *avctx)
Finalize encoding and free any memory allocated by the encoder.
Definition: ac3enc.c:2113
int ff_ac3_validate_metadata(AC3EncodeContext *s)
Validate metadata options as set by AVOption system.
Definition: ac3enc.c:1930
void ff_ac3_adjust_frame_size(AC3EncodeContext *s)
Adjust the frame size to make the average bit rate match the target bit rate.
Definition: ac3enc.c:253
int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
const AVCodecDefault ff_ac3_enc_defaults[]
Definition: ac3enc.c:127
void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
Set the initial coupling strategy parameters prior to coupling analysis.
Definition: ac3enc.c:271
const AVOption ff_ac3_enc_options[]
Definition: ac3enc.c:77
int ff_ac3_float_encode_init(AVCodecContext *avctx)
Definition: ac3enc_float.c:122
int32_t SampleType
Definition: ac3enc.h:63
int ff_ac3_float_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
int ff_ac3_encode_frame_common_end(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: ac3enc.c:1742
int64_t CoefSumType
Definition: ac3enc.h:65
const uint64_t ff_ac3_channel_layouts[19]
List of supported channel layouts.
Definition: ac3enc.c:142
int ff_ac3_encode_init(AVCodecContext *avctx)
Definition: ac3enc.c:2506
int32_t CoefType
Definition: ac3enc.h:64
uint8_t
int32_t
Libavcodec external API header.
#define s(width, name)
Definition: cbs_vp9.c:257
long long int64_t
Definition: coverity.c:34
static AVFrame * frame
int
bitstream writer API
typedef void(RENAME(mix_any_func_type))
Data for a single audio block.
Definition: ac3enc.h:126
uint8_t new_rematrixing_strategy
send new rematrixing flags in this block
Definition: ac3enc.h:137
int new_snr_offsets
send new SNR offsets
Definition: ac3enc.h:146
int32_t ** fixed_coef
fixed-point MDCT coefficients
Definition: ac3enc.h:128
uint16_t ** qmant
quantized mantissas
Definition: ac3enc.h:134
uint8_t ** cpl_coord_exp
coupling coord exponents (cplcoexp)
Definition: ac3enc.h:135
int16_t ** psd
psd per frequency bin
Definition: ac3enc.h:131
int new_cpl_strategy
send new coupling strategy
Definition: ac3enc.h:140
int16_t ** mask
masking curve
Definition: ac3enc.h:133
uint8_t rematrixing_flags[4]
rematrixing flags
Definition: ac3enc.h:139
uint8_t ** cpl_coord_mant
coupling coord mantissas (cplcomant)
Definition: ac3enc.h:136
int16_t ** band_psd
psd per critical band
Definition: ac3enc.h:132
int num_rematrixing_bands
number of rematrixing bands
Definition: ac3enc.h:138
uint8_t new_cpl_coords[AC3_MAX_CHANNELS]
send new coupling coordinates (cplcoe)
Definition: ac3enc.h:144
uint8_t channel_in_cpl[AC3_MAX_CHANNELS]
channel in coupling (chincpl)
Definition: ac3enc.h:142
int new_cpl_leak
send new coupling leak info
Definition: ac3enc.h:147
int cpl_in_use
coupling in use for this block (cplinu)
Definition: ac3enc.h:141
uint8_t cpl_master_exp[AC3_MAX_CHANNELS]
coupling coord master exponents (mstrcplco)
Definition: ac3enc.h:145
uint8_t ** grouped_exp
grouped exponents
Definition: ac3enc.h:130
int num_cpl_channels
number of channels in coupling
Definition: ac3enc.h:143
int end_freq[AC3_MAX_CHANNELS]
end frequency bin (endmant)
Definition: ac3enc.h:148
CoefType ** mdct_coef
MDCT coefficients.
Definition: ac3enc.h:127
uint8_t ** exp
original exponents
Definition: ac3enc.h:129
Encoding Options used by AVOption.
Definition: ac3enc.h:91
float ltrt_surround_mix_level
Definition: ac3enc.h:106
int dialogue_level
Definition: ac3enc.h:93
float surround_mix_level
Definition: ac3enc.h:96
int dolby_surround_ex_mode
Definition: ac3enc.h:110
int channel_coupling
Definition: ac3enc.h:119
int eac3_mixing_metadata
Definition: ac3enc.h:113
int cpl_start
Definition: ac3enc.h:120
int dolby_headphone_mode
Definition: ac3enc.h:111
int extended_bsi_2
Definition: ac3enc.h:109
float loro_surround_mix_level
Definition: ac3enc.h:108
int audio_production_info
Definition: ac3enc.h:98
int allow_per_frame_metadata
Definition: ac3enc.h:117
int dolby_surround_mode
Definition: ac3enc.h:97
int original
Definition: ac3enc.h:102
int room_type
Definition: ac3enc.h:100
int extended_bsi_1
Definition: ac3enc.h:103
int copyright
Definition: ac3enc.h:101
int stereo_rematrixing
Definition: ac3enc.h:118
float loro_center_mix_level
Definition: ac3enc.h:107
int bitstream_mode
Definition: ac3enc.h:94
int eac3_info_metadata
Definition: ac3enc.h:114
int ad_converter_type
Definition: ac3enc.h:112
int preferred_stereo_downmix
Definition: ac3enc.h:104
float ltrt_center_mix_level
Definition: ac3enc.h:105
int mixing_level
Definition: ac3enc.h:99
float center_mix_level
Definition: ac3enc.h:95
AC-3 encoder private context.
Definition: ac3enc.h:154
int channels
total number of channels (nchans)
Definition: ac3enc.h:190
int fast_gain_code[AC3_MAX_CHANNELS]
fast gain codes (signal-to-mask ratio) (fgaincod)
Definition: ac3enc.h:226
int fine_snr_offset[AC3_MAX_CHANNELS]
fine SNR offsets (fsnroffst)
Definition: ac3enc.h:227
int channel_mode
channel mode (acmod)
Definition: ac3enc.h:195
int(* allocate_sample_buffers)(struct AC3EncodeContext *s)
Definition: ac3enc.h:261
uint8_t frame_exp_strategy[AC3_MAX_CHANNELS]
frame exp strategy index
Definition: ac3enc.h:248
uint8_t * cpl_coord_mant_buffer
Definition: ac3enc.h:245
PutBitContext pb
bitstream writer context
Definition: ac3enc.h:158
MECmpContext mecc
Definition: ac3enc.h:165
int warned_alternate_bitstream
Definition: ac3enc.h:254
uint8_t * exp_buffer
Definition: ac3enc.h:238
int16_t * qmant_buffer
Definition: ac3enc.h:243
AC3DSPContext ac3dsp
AC-3 optimized functions.
Definition: ac3enc.h:166
int16_t * band_psd_buffer
Definition: ac3enc.h:241
uint8_t * bap1_buffer
Definition: ac3enc.h:235
int lfe_on
indicates if there is an LFE channel (lfeon)
Definition: ac3enc.h:191
int fixed_point
indicates if fixed-point encoder is being used
Definition: ac3enc.h:172
AVClass * av_class
AVClass used for AVOption.
Definition: ac3enc.h:155
void(* output_frame_header)(struct AC3EncodeContext *s)
Definition: ac3enc.h:264
int slow_gain_code
slow gain code (sgaincod)
Definition: ac3enc.h:219
int cpl_on
coupling turned on for this frame
Definition: ac3enc.h:210
int(* mdct_init)(struct AC3EncodeContext *s)
Definition: ac3enc.h:258
int loro_center_mix_level
Lo/Ro center mix level code.
Definition: ac3enc.h:202
int cutoff
user-specified cutoff frequency, in Hz
Definition: ac3enc.h:205
int frame_bits
all frame bits except exponents and mantissas
Definition: ac3enc.h:229
int ref_bap_set
indicates if ref_bap pointers have been set
Definition: ac3enc.h:252
int db_per_bit_code
dB/bit code (dbpbcod)
Definition: ac3enc.h:222
int cpl_enabled
coupling enabled for all frames
Definition: ac3enc.h:211
int coarse_snr_offset
coarse SNR offsets (csnroffst)
Definition: ac3enc.h:225
void(* mdct_end)(struct AC3EncodeContext *s)
Definition: ac3enc.h:257
SampleType * windowed_samples
Definition: ac3enc.h:232
AC3Block blocks[AC3_MAX_BLOCKS]
per-block info
Definition: ac3enc.h:170
AudioDSPContext adsp
Definition: ac3enc.h:159
int ltrt_center_mix_level
Lt/Rt center mix level code.
Definition: ac3enc.h:200
int64_t samples_written
sample count (used to avg. bitrate)
Definition: ac3enc.h:187
int use_frame_exp_strategy
indicates use of frame exp strategy
Definition: ac3enc.h:249
uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]
exponent strategies
Definition: ac3enc.h:247
AC3BitAllocParameters bit_alloc
bit allocation parameters
Definition: ac3enc.h:224
int bit_rate
target bit rate, in bits-per-second
Definition: ac3enc.h:177
int num_blks_code
number of blocks code (numblkscod)
Definition: ac3enc.h:180
int floor_code
floor code (floorcod)
Definition: ac3enc.h:223
int16_t * mask_buffer
Definition: ac3enc.h:242
int32_t * fixed_coef_buffer
Definition: ac3enc.h:237
int slow_decay_code
slow decay code (sdcycod)
Definition: ac3enc.h:220
SampleType ** planar_samples
Definition: ac3enc.h:233
uint8_t * grouped_exp_buffer
Definition: ac3enc.h:239
int fast_decay_code
fast decay code (fdcycod)
Definition: ac3enc.h:221
int frame_size
current frame size in bytes
Definition: ac3enc.h:183
int frame_size_min
minimum frame size in case rounding is necessary
Definition: ac3enc.h:182
uint16_t crc_inv[2]
Definition: ac3enc.h:185
int has_center
indicates if there is a center channel
Definition: ac3enc.h:193
int frame_size_code
frame size code (frmsizecod)
Definition: ac3enc.h:184
AVCodecContext * avctx
parent AVCodecContext
Definition: ac3enc.h:157
int has_surround
indicates if there are one or more surround channels
Definition: ac3enc.h:194
CoefType * mdct_coef_buffer
Definition: ac3enc.h:236
int cpl_end_freq
coupling channel end frequency bin
Definition: ac3enc.h:208
int eac3
indicates if this is E-AC-3 vs. AC-3
Definition: ac3enc.h:173
int16_t * psd_buffer
Definition: ac3enc.h:240
int exponent_bits
number of bits used for exponents
Definition: ac3enc.h:230
uint8_t * ref_bap[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]
bit allocation pointers (bap)
Definition: ac3enc.h:251
int num_cpl_bands
number of coupling bands (ncplbnd)
Definition: ac3enc.h:213
int surround_mix_level
surround mix level code
Definition: ac3enc.h:199
const uint8_t * channel_map
channel map used to reorder channels
Definition: ac3enc.h:196
int start_freq[AC3_MAX_CHANNELS]
start frequency bin (strtmant)
Definition: ac3enc.h:207
int lfe_channel
channel index of the LFE channel
Definition: ac3enc.h:192
int num_cpl_subbands
number of coupling subbands (ncplsubnd)
Definition: ac3enc.h:212
int64_t bits_written
bit count (used to avg. bitrate)
Definition: ac3enc.h:186
int center_mix_level
center mix level code
Definition: ac3enc.h:198
int fbw_channels
number of full-bandwidth channels (nfchans)
Definition: ac3enc.h:189
int ltrt_surround_mix_level
Lt/Rt surround mix level code.
Definition: ac3enc.h:201
uint8_t * cpl_coord_exp_buffer
Definition: ac3enc.h:244
uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]
number of coeffs in each coupling band
Definition: ac3enc.h:214
FFTContext mdct
FFT context for MDCT calculation.
Definition: ac3enc.h:167
int bitstream_mode
bitstream mode (bsmod)
Definition: ac3enc.h:175
int bitstream_id
bitstream id (bsid)
Definition: ac3enc.h:174
uint8_t * bap_buffer
Definition: ac3enc.h:234
AC3EncOptions options
encoding options
Definition: ac3enc.h:156
int frame_bits_fixed
number of non-coefficient bits for fixed parameters
Definition: ac3enc.h:228
const SampleType * mdct_window
MDCT window function array.
Definition: ac3enc.h:168
uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]
reference blocks for EXP_REUSE
Definition: ac3enc.h:250
int sample_rate
sampling frequency, in Hz
Definition: ac3enc.h:178
int num_blocks
number of blocks per frame
Definition: ac3enc.h:181
int rematrixing_enabled
stereo rematrixing enabled
Definition: ac3enc.h:216
int loro_surround_mix_level
Lo/Ro surround mix level code.
Definition: ac3enc.h:203
AVFixedDSPContext * fdsp
Definition: ac3enc.h:163
int bandwidth_code
bandwidth code (0 to 60) (chbwcod)
Definition: ac3enc.h:206
Describe the class of an AVClass context structure.
Definition: log.h:67
main external API structure.
Definition: avcodec.h:536
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
Definition: fft.h:83