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1 /*
2  * Common code between the AC-3 and E-AC-3 decoders
3  * Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com>
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
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  */
22 /**
23  * @file
24  * Common code between the AC-3 and E-AC-3 decoders.
25  *
26  * Summary of MDCT Coefficient Grouping:
27  * The individual MDCT coefficient indices are often referred to in the
28  * (E-)AC-3 specification as frequency bins. These bins are grouped together
29  * into subbands of 12 coefficients each. The subbands are grouped together
30  * into bands as defined in the bitstream by the band structures, which
31  * determine the number of bands and the size of each band. The full spectrum
32  * of 256 frequency bins is divided into 1 DC bin + 21 subbands = 253 bins.
33  * This system of grouping coefficients is used for channel bandwidth, stereo
34  * rematrixing, channel coupling, enhanced coupling, and spectral extension.
35  *
36  * +-+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-+
37  * |1| |12| | [12|12|12|12] | | | | | | | | | | | | |3|
38  * +-+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-+
39  * ~~~ ~~~~ ~~~~~~~~~~~~~ ~~~
40  * | | | |
41  * | | | 3 unused frequency bins--+
42  * | | |
43  * | | +--1 band containing 4 subbands
44  * | |
45  * | +--1 subband of 12 frequency bins
46  * |
47  * +--DC frequency bin
48  */
50 #ifndef AVCODEC_AC3DEC_H
51 #define AVCODEC_AC3DEC_H
53 #include "libavutil/float_dsp.h"
54 #include "libavutil/fixed_dsp.h"
55 #include "libavutil/lfg.h"
56 #include "ac3.h"
57 #include "ac3dsp.h"
58 #include "bswapdsp.h"
59 #include "get_bits.h"
60 #include "fft.h"
61 #include "fmtconvert.h"
63 #define AC3_OUTPUT_LFEON 8
65 #define SPX_MAX_BANDS 17
67 /** Large enough for maximum possible frame size when the specification limit is ignored */
68 #define AC3_FRAME_BUFFER_SIZE 32768
70 typedef struct AC3DecodeContext {
71  AVClass *class; ///< class for AVOptions
72  AVCodecContext *avctx; ///< parent context
73  GetBitContext gbc; ///< bitstream reader
75 ///@name Bit stream information
76 ///@{
77  int frame_type; ///< frame type (strmtyp)
78  int substreamid; ///< substream identification
79  int superframe_size; ///< current superframe size, in bytes
80  int frame_size; ///< current frame size, in bytes
81  int bit_rate; ///< stream bit rate, in bits-per-second
82  int sample_rate; ///< sample frequency, in Hz
83  int num_blocks; ///< number of audio blocks
84  int bitstream_id; ///< bitstream id (bsid)
85  int bitstream_mode; ///< bitstream mode (bsmod)
86  int channel_mode; ///< channel mode (acmod)
87  int lfe_on; ///< lfe channel in use
88  int dialog_normalization[2]; ///< dialog level in dBFS (dialnorm)
89  int compression_exists[2]; ///< compression field is valid for frame (compre)
90  int compression_gain[2]; ///< gain to apply for heavy compression (compr)
91  int channel_map; ///< custom channel map (chanmap)
92  int preferred_downmix; ///< Preferred 2-channel downmix mode (dmixmod)
93  int center_mix_level; ///< Center mix level index
94  int center_mix_level_ltrt; ///< Center mix level index for Lt/Rt (ltrtcmixlev)
95  int surround_mix_level; ///< Surround mix level index
96  int surround_mix_level_ltrt; ///< Surround mix level index for Lt/Rt (ltrtsurmixlev)
97  int lfe_mix_level_exists; ///< indicates if lfemixlevcod is specified (lfemixlevcode)
98  int lfe_mix_level; ///< LFE mix level index (lfemixlevcod)
99  int eac3; ///< indicates if current frame is E-AC-3
100  int eac3_frame_dependent_found; ///< bitstream has E-AC-3 dependent frame(s)
101  int eac3_subsbtreamid_found; ///< bitstream has E-AC-3 additional substream(s)
102  int dolby_surround_mode; ///< dolby surround mode (dsurmod)
103  int dolby_surround_ex_mode; ///< dolby surround ex mode (dsurexmod)
104  int dolby_headphone_mode; ///< dolby headphone mode (dheadphonmod)
105 ///@}
112  int target_level; ///< target level in dBFS
113  float level_gain[2];
115 ///@name Frame syntax parameters
116  int snr_offset_strategy; ///< SNR offset strategy (snroffststr)
117  int block_switch_syntax; ///< block switch syntax enabled (blkswe)
118  int dither_flag_syntax; ///< dither flag syntax enabled (dithflage)
119  int bit_allocation_syntax; ///< bit allocation model syntax enabled (bamode)
120  int fast_gain_syntax; ///< fast gain codes enabled (frmfgaincode)
121  int dba_syntax; ///< delta bit allocation syntax enabled (dbaflde)
122  int skip_syntax; ///< skip field syntax enabled (skipflde)
123  ///@}
125 ///@name Standard coupling
126  int cpl_in_use[AC3_MAX_BLOCKS]; ///< coupling in use (cplinu)
127  int cpl_strategy_exists[AC3_MAX_BLOCKS];///< coupling strategy exists (cplstre)
128  int channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl)
129  int phase_flags_in_use; ///< phase flags in use (phsflginu)
130  int phase_flags[AC3_MAX_CPL_BANDS]; ///< phase flags (phsflg)
131  int num_cpl_bands; ///< number of coupling bands (ncplbnd)
133  uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band
134  int firstchincpl; ///< first channel in coupling
135  int first_cpl_coords[AC3_MAX_CHANNELS]; ///< first coupling coordinates states (firstcplcos)
136  int cpl_coords[AC3_MAX_CHANNELS][AC3_MAX_CPL_BANDS]; ///< coupling coordinates (cplco)
137 ///@}
139 ///@name Spectral extension
140 ///@{
141  int spx_in_use; ///< spectral extension in use (spxinu)
142  uint8_t channel_uses_spx[AC3_MAX_CHANNELS]; ///< channel uses spectral extension (chinspx)
143  int8_t spx_atten_code[AC3_MAX_CHANNELS]; ///< spx attenuation code (spxattencod)
144  int spx_src_start_freq; ///< spx start frequency bin
145  int spx_dst_end_freq; ///< spx end frequency bin
146  int spx_dst_start_freq; ///< spx starting frequency bin for copying (copystartmant)
147  ///< the copy region ends at the start of the spx region.
148  int num_spx_bands; ///< number of spx bands (nspxbnds)
150  uint8_t spx_band_sizes[SPX_MAX_BANDS]; ///< number of bins in each spx band
151  uint8_t first_spx_coords[AC3_MAX_CHANNELS]; ///< first spx coordinates states (firstspxcos)
152  INTFLOAT spx_noise_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS]; ///< spx noise blending factor (nblendfact)
153  INTFLOAT spx_signal_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS];///< spx signal blending factor (sblendfact)
154 ///@}
156 ///@name Adaptive hybrid transform
157  int channel_uses_aht[AC3_MAX_CHANNELS]; ///< channel AHT in use (chahtinu)
159 ///@}
161 ///@name Channel
162  int fbw_channels; ///< number of full-bandwidth channels
163  int channels; ///< number of total channels
164  int lfe_ch; ///< index of LFE channel
165  SHORTFLOAT *downmix_coeffs[2]; ///< stereo downmix coefficients
166  int downmixed; ///< indicates if coeffs are currently downmixed
167  int output_mode; ///< output channel configuration
168  int prev_output_mode; ///< output channel configuration for previous frame
169  int out_channels; ///< number of output channels
170  int prev_bit_rate; ///< stream bit rate, in bits-per-second for previous frame
171 ///@}
173 ///@name Dynamic range
174  INTFLOAT dynamic_range[2]; ///< dynamic range
175  INTFLOAT drc_scale; ///< percentage of dynamic range compression to be applied
176  int heavy_compression; ///< apply heavy compression
177  INTFLOAT heavy_dynamic_range[2]; ///< heavy dynamic range compression
178 ///@}
180 ///@name Bandwidth
181  int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant)
182  int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant)
183 ///@}
185 ///@name Consistent noise generation
186  int consistent_noise_generation; ///< seed noise generation with AC-3 frame on decode
187 ///@}
189 ///@name Rematrixing
190  int num_rematrixing_bands; ///< number of rematrixing bands (nrematbnd)
191  int rematrixing_flags[4]; ///< rematrixing flags (rematflg)
192 ///@}
194 ///@name Exponents
195  int num_exp_groups[AC3_MAX_CHANNELS]; ///< Number of exponent groups (nexpgrp)
196  int8_t dexps[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< decoded exponents
197  int exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS]; ///< exponent strategies (expstr)
198 ///@}
200 ///@name Bit allocation
201  AC3BitAllocParameters bit_alloc_params; ///< bit allocation parameters
202  int first_cpl_leak; ///< first coupling leak state (firstcplleak)
203  int snr_offset[AC3_MAX_CHANNELS]; ///< signal-to-noise ratio offsets (snroffst)
204  int fast_gain[AC3_MAX_CHANNELS]; ///< fast gain values/SMR's (fgain)
205  uint8_t bap[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< bit allocation pointers
206  int16_t psd[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< scaled exponents
207  int16_t band_psd[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS]; ///< interpolated exponents
208  int16_t mask[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS]; ///< masking curve values
209  int dba_mode[AC3_MAX_CHANNELS]; ///< delta bit allocation mode
210  int dba_nsegs[AC3_MAX_CHANNELS]; ///< number of delta segments
211  uint8_t dba_offsets[AC3_MAX_CHANNELS][8]; ///< delta segment offsets
212  uint8_t dba_lengths[AC3_MAX_CHANNELS][8]; ///< delta segment lengths
213  uint8_t dba_values[AC3_MAX_CHANNELS][8]; ///< delta values for each segment
214 ///@}
216 ///@name Zero-mantissa dithering
217  int dither_flag[AC3_MAX_CHANNELS]; ///< dither flags (dithflg)
218  AVLFG dith_state; ///< for dither generation
219 ///@}
221 ///@name IMDCT
222  int block_switch[AC3_MAX_CHANNELS]; ///< block switch flags (blksw)
223  FFTContext imdct_512; ///< for 512 sample IMDCT
224  FFTContext imdct_256; ///< for 256 sample IMDCT
225 ///@}
227 ///@name Optimization
229 #if USE_FIXED
231 #else
233 #endif
235  FmtConvertContext fmt_conv; ///< optimized conversion functions
236 ///@}
242 ///@name Aligned arrays
243  DECLARE_ALIGNED(16, int, fixed_coeffs)[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< fixed-point transform coefficients
245  DECLARE_ALIGNED(32, INTFLOAT, delay)[EAC3_MAX_CHANNELS][AC3_BLOCK_SIZE]; ///< delay - added to the next block
246  DECLARE_ALIGNED(32, INTFLOAT, window)[AC3_BLOCK_SIZE]; ///< window coefficients
247  DECLARE_ALIGNED(32, INTFLOAT, tmp_output)[AC3_BLOCK_SIZE]; ///< temporary storage for output before windowing
248  DECLARE_ALIGNED(32, SHORTFLOAT, output)[EAC3_MAX_CHANNELS][AC3_BLOCK_SIZE]; ///< output after imdct transform and windowing
251 ///@}
254 /**
255  * Parse the E-AC-3 frame header.
256  * This parses both the bit stream info and audio frame header.
257  */
260 /**
261  * Decode mantissas in a single channel for the entire frame.
262  * This is used when AHT mode is enabled.
263  */
266 /**
267  * Apply spectral extension to each channel by copying lower frequency
268  * coefficients to higher frequency bins and applying side information to
269  * approximate the original high frequency signal.
270  */
273 #if (!USE_FIXED)
274 extern float ff_ac3_heavy_dynamic_range_tab[256];
275 #endif
277 #endif /* AVCODEC_AC3DEC_H */
Definition: lfg.h:27
INTFLOAT drc_scale
percentage of dynamic range compression to be applied
Definition: ac3dec.h:175
SHORTFLOAT * downmix_coeffs[2]
stereo downmix coefficients
Definition: ac3dec.h:165
int dba_nsegs[AC3_MAX_CHANNELS]
number of delta segments
Definition: ac3dec.h:210
temp buffer to prevent overread
Definition: ac3dec.h:249
scaled exponents
Definition: ac3dec.h:206
int spx_in_use
spectral extension in use (spxinu)
Definition: ac3dec.h:141
uint8_t dba_offsets[AC3_MAX_CHANNELS][8]
delta segment offsets
Definition: ac3dec.h:211
int dither_flag[AC3_MAX_CHANNELS]
dither flags (dithflg)
Definition: ac3dec.h:217
masking curve values
Definition: ac3dec.h:208
int preferred_downmix
Preferred 2-channel downmix mode (dmixmod)
Definition: ac3dec.h:92
#define AC3_MAX_COEFS
Definition: ac3.h:35
int channels
number of total channels
Definition: ac3dec.h:163
AVFloatDSPContext * fdsp
Definition: ac3dec.h:232
int spx_dst_end_freq
spx end frequency bin
Definition: ac3dec.h:145
output after imdct transform and windowing
Definition: ac3dec.h:248
int exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS]
exponent strategies (expstr)
Definition: ac3dec.h:197
int lfe_on
lfe channel in use
Definition: ac3dec.h:87
int block_switch[AC3_MAX_CHANNELS]
block switch flags (blksw)
Definition: ac3dec.h:222
int dba_syntax
delta bit allocation syntax enabled (dbaflde)
Definition: ac3dec.h:121
int preferred_stereo_downmix
Definition: ac3dec.h:107
int dialog_normalization[2]
dialog level in dBFS (dialnorm)
Definition: ac3dec.h:88
int spx_src_start_freq
spx start frequency bin
Definition: ac3dec.h:144
int heavy_compression
apply heavy compression
Definition: ac3dec.h:176
uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]
number of coeffs in each coupling band
Definition: ac3dec.h:133
Large enough for maximum possible frame size when the specification limit is ignored.
Definition: ac3dec.h:68
int lfe_mix_level_exists
indicates if lfemixlevcod is specified (lfemixlevcode)
Definition: ac3dec.h:97
Definition: aac_defines.h:86
uint8_t spx_band_struct[SPX_MAX_BANDS]
Definition: ac3dec.h:149
float ltrt_center_mix_level
Definition: ac3dec.h:108
int first_cpl_coords[AC3_MAX_CHANNELS]
first coupling coordinates states (firstcplcos)
Definition: ac3dec.h:135
spx noise blending factor (nblendfact)
Definition: ac3dec.h:152
int compression_gain[2]
gain to apply for heavy compression (compr)
Definition: ac3dec.h:90
static void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch)
Decode mantissas in a single channel for the entire frame.
int num_rematrixing_bands
number of rematrixing bands (nrematbnd)
Definition: ac3dec.h:190
int fast_gain[AC3_MAX_CHANNELS]
fast gain values/SMR's (fgain)
Definition: ac3dec.h:204
float ltrt_surround_mix_level
Definition: ac3dec.h:109
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
coupling coordinates (cplco)
Definition: ac3dec.h:136
int num_exp_groups[AC3_MAX_CHANNELS]
Number of exponent groups (nexpgrp)
Definition: ac3dec.h:195
bitstream reader API header.
float ff_ac3_heavy_dynamic_range_tab[256]
Definition: ac3dec.c:69
static int ff_eac3_parse_header(AC3DecodeContext *s)
Parse the E-AC-3 frame header.
int bit_allocation_syntax
bit allocation model syntax enabled (bamode)
Definition: ac3dec.h:119
int phase_flags_in_use
phase flags in use (phsflginu)
Definition: ac3dec.h:129
int phase_flags[AC3_MAX_CPL_BANDS]
phase flags (phsflg)
Definition: ac3dec.h:130
int out_channels
number of output channels
Definition: ac3dec.h:169
int channel_map
custom channel map (chanmap)
Definition: ac3dec.h:91
int consistent_noise_generation
seed noise generation with AC-3 frame on decode
Definition: ac3dec.h:186
int substreamid
substream identification
Definition: ac3dec.h:78
FFTContext imdct_256
for 256 sample IMDCT
Definition: ac3dec.h:224
int bit_rate
stream bit rate, in bits-per-second
Definition: ac3dec.h:81
int lfe_ch
index of LFE channel
Definition: ac3dec.h:164
uint8_t first_spx_coords[AC3_MAX_CHANNELS]
first spx coordinates states (firstspxcos)
Definition: ac3dec.h:151
AC3BitAllocParameters bit_alloc_params
bit allocation parameters
Definition: ac3dec.h:201
int dolby_surround_mode
dolby surround mode (dsurmod)
Definition: ac3dec.h:102
GetBitContext gbc
bitstream reader
Definition: ac3dec.h:73
int eac3_subsbtreamid_found
bitstream has E-AC-3 additional substream(s)
Definition: ac3dec.h:101
AC3DSPContext ac3dsp
Definition: ac3dec.h:234
maximum number of channels, including coupling channel
Definition: ac3.h:32
int superframe_size
current superframe size, in bytes
Definition: ac3dec.h:79
int dolby_headphone_mode
dolby headphone mode (dheadphonmod)
Definition: ac3dec.h:104
float loro_center_mix_level
Definition: ac3dec.h:110
int compression_exists[2]
compression field is valid for frame (compre)
Definition: ac3dec.h:89
transform coefficients
Definition: ac3dec.h:244
int block_switch_syntax
block switch syntax enabled (blkswe)
Definition: ac3dec.h:117
float level_gain[2]
Definition: ac3dec.h:113
int fast_gain_syntax
fast gain codes enabled (frmfgaincode)
Definition: ac3dec.h:120
interpolated exponents
Definition: ac3dec.h:207
uint8_t channel_uses_spx[AC3_MAX_CHANNELS]
channel uses spectral extension (chinspx)
Definition: ac3dec.h:142
#define AC3_BLOCK_SIZE
Definition: ac3.h:36
INTFLOAT dynamic_range[2]
dynamic range
Definition: ac3dec.h:174
window coefficients
Definition: ac3dec.h:246
Definition: ac3dec.h:238
Definition: fft.h:88
BswapDSPContext bdsp
Definition: ac3dec.h:228
int surround_mix_level_ltrt
Surround mix level index for Lt/Rt (ltrtsurmixlev)
Definition: ac3dec.h:96
float loro_surround_mix_level
Definition: ac3dec.h:111
int dither_flag_syntax
dither flag syntax enabled (dithflage)
Definition: ac3dec.h:118
int end_freq[AC3_MAX_CHANNELS]
end frequency bin (endmant)
Definition: ac3dec.h:182
INTFLOAT heavy_dynamic_range[2]
heavy dynamic range compression
Definition: ac3dec.h:177
temporary storage for output before windowing
Definition: ac3dec.h:247
uint8_t dba_values[AC3_MAX_CHANNELS][8]
delta values for each segment
Definition: ac3dec.h:213
final output buffer
Definition: ac3dec.h:250
FFTContext imdct_512
for 512 sample IMDCT
Definition: ac3dec.h:223
#define s(width, name)
Definition: cbs_vp9.c:257
Definition: aac_defines.h:89
AVCodecContext * avctx
parent context
Definition: ac3dec.h:72
int channel_in_cpl[AC3_MAX_CHANNELS]
channel in coupling (chincpl)
Definition: ac3dec.h:128
int fbw_channels
number of full-bandwidth channels
Definition: ac3dec.h:162
int8_t spx_atten_code[AC3_MAX_CHANNELS]
spx attenuation code (spxattencod)
Definition: ac3dec.h:143
Definition: ac3dec.h:239
bit allocation pointers
Definition: ac3dec.h:205
uint8_t cpl_band_struct[AC3_MAX_CPL_BANDS]
Definition: ac3dec.h:132
main external API structure.
Definition: avcodec.h:1533
Definition: ac3.h:40
int num_cpl_bands
number of coupling bands (ncplbnd)
Definition: ac3dec.h:131
int num_spx_bands
number of spx bands (nspxbnds)
Definition: ac3dec.h:148
static void ff_eac3_apply_spectral_extension(AC3DecodeContext *s)
Apply spectral extension to each channel by copying lower frequency coefficients to higher frequency ...
spx signal blending factor (sblendfact)
Definition: ac3dec.h:153
Describe the class of an AVClass context structure.
Definition: log.h:67
int bitstream_mode
bitstream mode (bsmod)
Definition: ac3dec.h:85
int center_mix_level_ltrt
Center mix level index for Lt/Rt (ltrtcmixlev)
Definition: ac3dec.h:94
int frame_type
frame type (strmtyp)
Definition: ac3dec.h:77
delay - added to the next block
Definition: ac3dec.h:245
#define AC3_MAX_BLOCKS
Definition: ac3.h:37
int eac3
indicates if current frame is E-AC-3
Definition: ac3dec.h:99
int channel_uses_aht[AC3_MAX_CHANNELS]
channel AHT in use (chahtinu)
Definition: ac3dec.h:157
uint8_t dba_lengths[AC3_MAX_CHANNELS][8]
delta segment lengths
Definition: ac3dec.h:212
int prev_output_mode
output channel configuration for previous frame
Definition: ac3dec.h:168
int cpl_in_use[AC3_MAX_BLOCKS]
coupling in use (cplinu)
Definition: ac3dec.h:126
int firstchincpl
first channel in coupling
Definition: ac3dec.h:134
int dba_mode[AC3_MAX_CHANNELS]
delta bit allocation mode
Definition: ac3dec.h:209
int first_cpl_leak
first coupling leak state (firstcplleak)
Definition: ac3dec.h:202
int prev_bit_rate
stream bit rate, in bits-per-second for previous frame
Definition: ac3dec.h:170
int surround_mix_level
Surround mix level index.
Definition: ac3dec.h:95
int snr_offset[AC3_MAX_CHANNELS]
signal-to-noise ratio offsets (snroffst)
Definition: ac3dec.h:203
int downmixed
indicates if coeffs are currently downmixed
Definition: ac3dec.h:166
Definition: ac3.h:41
Definition: ac3dec.h:240
int num_blocks
number of audio blocks
Definition: ac3dec.h:83
FmtConvertContext fmt_conv
optimized conversion functions
Definition: ac3dec.h:235
Definition: ac3dec.h:65
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:782
int target_level
target level in dBFS
Definition: ac3dec.h:112
pre-IDCT mantissas
Definition: ac3dec.h:158
int rematrixing_flags[4]
rematrixing flags (rematflg)
Definition: ac3dec.h:191
int fixed_coeffs[AC3_MAX_CHANNELS][AC3_MAX_COEFS]
fixed-point transform coefficients
Definition: ac3dec.h:243
maximum number of channels in EAC3
Definition: ac3.h:31
uint8_t spx_band_sizes[SPX_MAX_BANDS]
number of bins in each spx band
Definition: ac3dec.h:150
int lfe_mix_level
LFE mix level index (lfemixlevcod)
Definition: ac3dec.h:98
int snr_offset_strategy
SNR offset strategy (snroffststr)
Definition: ac3dec.h:116
int start_freq[AC3_MAX_CHANNELS]
start frequency bin (strtmant)
Definition: ac3dec.h:181
int sample_rate
sample frequency, in Hz
Definition: ac3dec.h:82
int center_mix_level
Center mix level index.
Definition: ac3dec.h:93
int output_mode
output channel configuration
Definition: ac3dec.h:167
int frame_size
current frame size, in bytes
Definition: ac3dec.h:80
int dolby_surround_ex_mode
dolby surround ex mode (dsurexmod)
Definition: ac3dec.h:103
AVLFG dith_state
for dither generation
Definition: ac3dec.h:218
int cpl_strategy_exists[AC3_MAX_BLOCKS]
coupling strategy exists (cplstre)
Definition: ac3dec.h:127
int bitstream_id
bitstream id (bsid)
Definition: ac3dec.h:84
int eac3_frame_dependent_found
bitstream has E-AC-3 dependent frame(s)
Definition: ac3dec.h:100
Common code between the AC-3 encoder and decoder.
int channel_mode
channel mode (acmod)
Definition: ac3dec.h:86
int spx_dst_start_freq
spx starting frequency bin for copying (copystartmant) the copy region ends at the start of the spx r...
Definition: ac3dec.h:146
int skip_syntax
skip field syntax enabled (skipflde)
Definition: ac3dec.h:122
uint8_t pi<< 24) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_U8,(uint64_t)((*(constuint8_t *) pi-0x80U))<< 56) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_S16,(uint64_t)(*(constint16_t *) pi)<< 48) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_S32,(uint64_t)(*(constint32_t *) pi)<< 32) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S64,(*(constint64_t *) pi >>56)+0x80) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S64,*(constint64_t *) pi *(1.0f/(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S64,*(constint64_t *) pi *(1.0/(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_FLT, llrintf(*(constfloat *) pi *(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31)))) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_DBL, llrint(*(constdouble *) pi *(INT64_C(1)<< 63)))#defineFMT_PAIR_FUNC(out, in) staticconv_func_type *constfmt_pair_to_conv_functions[AV_SAMPLE_FMT_NB *AV_SAMPLE_FMT_NB]={FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S64),};staticvoidcpy1(uint8_t **dst, constuint8_t **src, intlen){memcpy(*dst,*src, len);}staticvoidcpy2(uint8_t **dst, constuint8_t **src, intlen){memcpy(*dst,*src, 2 *len);}staticvoidcpy4(uint8_t **dst, constuint8_t **src, intlen){memcpy(*dst,*src, 4 *len);}staticvoidcpy8(uint8_t **dst, constuint8_t **src, intlen){memcpy(*dst,*src, 8 *len);}AudioConvert *swri_audio_convert_alloc(enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, constint *ch_map, intflags){AudioConvert *ctx;conv_func_type *f=fmt_pair_to_conv_functions[av_get_packed_sample_fmt(out_fmt)+AV_SAMPLE_FMT_NB *av_get_packed_sample_fmt(in_fmt)];if(!f) returnNULL;ctx=av_mallocz(sizeof(*ctx));if(!ctx) returnNULL;if(channels==1){in_fmt=av_get_planar_sample_fmt(in_fmt);out_fmt=av_get_planar_sample_fmt(out_fmt);}ctx->channels=channels;ctx->conv_f=f;ctx->ch_map=ch_map;if(in_fmt==AV_SAMPLE_FMT_U8||in_fmt==AV_SAMPLE_FMT_U8P) memset(ctx->silence, 0x80, sizeof(ctx->silence));if(out_fmt==in_fmt &&!ch_map){switch(av_get_bytes_per_sample(in_fmt)){case1:ctx->simd_f=cpy1;break;case2:ctx->simd_f=cpy2;break;case4:ctx->simd_f=cpy4;break;case8:ctx->simd_f=cpy8;break;}}if(HAVE_X86ASM &&1) swri_audio_convert_init_x86(ctx, out_fmt, in_fmt, channels);if(ARCH_ARM) swri_audio_convert_init_arm(ctx, out_fmt, in_fmt, channels);if(ARCH_AARCH64) swri_audio_convert_init_aarch64(ctx, out_fmt, in_fmt, channels);returnctx;}voidswri_audio_convert_free(AudioConvert **ctx){av_freep(ctx);}intswri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, intlen){intch;intoff=0;constintos=(out->planar?1:out->ch_count)*out->bps;unsignedmisaligned=0;av_assert0(ctx->channels==out->ch_count);if(ctx->in_simd_align_mask){intplanes=in->planar?in->ch_count:1;unsignedm=0;for(ch=0;ch< planes;ch++) m|=(intptr_t) in->ch[ch];misaligned|=m &ctx->in_simd_align_mask;}if(ctx->out_simd_align_mask){intplanes=out->planar?out->ch_count:1;unsignedm=0;for(ch=0;ch< planes;ch++) m|=(intptr_t) out->ch[ch];misaligned|=m &ctx->out_simd_align_mask;}if(ctx->simd_f &&!ctx->ch_map &&!misaligned){off=len &~15;av_assert1(off >=0);av_assert1(off<=len);av_assert2(ctx->channels==SWR_CH_MAX||!in->ch[ctx->channels]);if(off >0){if(out->planar==in->planar){intplanes=out->planar?out->ch_count:1;for(ch=0;ch< planes;ch++){ctx->simd_f(out-> ch ch
Definition: audioconvert.c:56
decoded exponents
Definition: ac3dec.h:196