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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 frame_size; ///< current frame size, in bytes
80  int bit_rate; ///< stream bit rate, in bits-per-second
81  int sample_rate; ///< sample frequency, in Hz
82  int num_blocks; ///< number of audio blocks
83  int bitstream_id; ///< bitstream id (bsid)
84  int bitstream_mode; ///< bitstream mode (bsmod)
85  int channel_mode; ///< channel mode (acmod)
86  int lfe_on; ///< lfe channel in use
87  int dialog_normalization[2]; ///< dialog level in dBFS (dialnorm)
88  int compression_exists[2]; ///< compression field is valid for frame (compre)
89  int compression_gain[2]; ///< gain to apply for heavy compression (compr)
90  int channel_map; ///< custom channel map
91  int preferred_downmix; ///< Preferred 2-channel downmix mode (dmixmod)
92  int center_mix_level; ///< Center mix level index
93  int center_mix_level_ltrt; ///< Center mix level index for Lt/Rt (ltrtcmixlev)
94  int surround_mix_level; ///< Surround mix level index
95  int surround_mix_level_ltrt; ///< Surround mix level index for Lt/Rt (ltrtsurmixlev)
96  int lfe_mix_level_exists; ///< indicates if lfemixlevcod is specified (lfemixlevcode)
97  int lfe_mix_level; ///< LFE mix level index (lfemixlevcod)
98  int eac3; ///< indicates if current frame is E-AC-3
99  int eac3_frame_dependent_found; ///< bitstream has E-AC-3 dependent frame(s)
100  int eac3_subsbtreamid_found; ///< bitstream has E-AC-3 additional substream(s)
101  int dolby_surround_mode; ///< dolby surround mode (dsurmod)
102  int dolby_surround_ex_mode; ///< dolby surround ex mode (dsurexmod)
103  int dolby_headphone_mode; ///< dolby headphone mode (dheadphonmod)
104 ///@}
111  int target_level; ///< target level in dBFS
112  float level_gain[2];
114 ///@name Frame syntax parameters
115  int snr_offset_strategy; ///< SNR offset strategy (snroffststr)
116  int block_switch_syntax; ///< block switch syntax enabled (blkswe)
117  int dither_flag_syntax; ///< dither flag syntax enabled (dithflage)
118  int bit_allocation_syntax; ///< bit allocation model syntax enabled (bamode)
119  int fast_gain_syntax; ///< fast gain codes enabled (frmfgaincode)
120  int dba_syntax; ///< delta bit allocation syntax enabled (dbaflde)
121  int skip_syntax; ///< skip field syntax enabled (skipflde)
122  ///@}
124 ///@name Standard coupling
125  int cpl_in_use[AC3_MAX_BLOCKS]; ///< coupling in use (cplinu)
126  int cpl_strategy_exists[AC3_MAX_BLOCKS];///< coupling strategy exists (cplstre)
127  int channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl)
128  int phase_flags_in_use; ///< phase flags in use (phsflginu)
129  int phase_flags[AC3_MAX_CPL_BANDS]; ///< phase flags (phsflg)
130  int num_cpl_bands; ///< number of coupling bands (ncplbnd)
132  uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band
133  int firstchincpl; ///< first channel in coupling
134  int first_cpl_coords[AC3_MAX_CHANNELS]; ///< first coupling coordinates states (firstcplcos)
135  int cpl_coords[AC3_MAX_CHANNELS][AC3_MAX_CPL_BANDS]; ///< coupling coordinates (cplco)
136 ///@}
138 ///@name Spectral extension
139 ///@{
140  int spx_in_use; ///< spectral extension in use (spxinu)
141  uint8_t channel_uses_spx[AC3_MAX_CHANNELS]; ///< channel uses spectral extension (chinspx)
142  int8_t spx_atten_code[AC3_MAX_CHANNELS]; ///< spx attenuation code (spxattencod)
143  int spx_src_start_freq; ///< spx start frequency bin
144  int spx_dst_end_freq; ///< spx end frequency bin
145  int spx_dst_start_freq; ///< spx starting frequency bin for copying (copystartmant)
146  ///< the copy region ends at the start of the spx region.
147  int num_spx_bands; ///< number of spx bands (nspxbnds)
149  uint8_t spx_band_sizes[SPX_MAX_BANDS]; ///< number of bins in each spx band
150  uint8_t first_spx_coords[AC3_MAX_CHANNELS]; ///< first spx coordinates states (firstspxcos)
151  INTFLOAT spx_noise_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS]; ///< spx noise blending factor (nblendfact)
152  INTFLOAT spx_signal_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS];///< spx signal blending factor (sblendfact)
153 ///@}
155 ///@name Adaptive hybrid transform
156  int channel_uses_aht[AC3_MAX_CHANNELS]; ///< channel AHT in use (chahtinu)
158 ///@}
160 ///@name Channel
161  int fbw_channels; ///< number of full-bandwidth channels
162  int channels; ///< number of total channels
163  int lfe_ch; ///< index of LFE channel
164  SHORTFLOAT *downmix_coeffs[2]; ///< stereo downmix coefficients
165  int downmixed; ///< indicates if coeffs are currently downmixed
166  int output_mode; ///< output channel configuration
167  int out_channels; ///< number of output channels
168 ///@}
170 ///@name Dynamic range
171  INTFLOAT dynamic_range[2]; ///< dynamic range
172  INTFLOAT drc_scale; ///< percentage of dynamic range compression to be applied
173  int heavy_compression; ///< apply heavy compression
174  INTFLOAT heavy_dynamic_range[2]; ///< heavy dynamic range compression
175 ///@}
177 ///@name Bandwidth
178  int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant)
179  int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant)
180 ///@}
182 ///@name Consistent noise generation
183  int consistent_noise_generation; ///< seed noise generation with AC-3 frame on decode
184 ///@}
186 ///@name Rematrixing
187  int num_rematrixing_bands; ///< number of rematrixing bands (nrematbnd)
188  int rematrixing_flags[4]; ///< rematrixing flags (rematflg)
189 ///@}
191 ///@name Exponents
192  int num_exp_groups[AC3_MAX_CHANNELS]; ///< Number of exponent groups (nexpgrp)
193  int8_t dexps[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< decoded exponents
194  int exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS]; ///< exponent strategies (expstr)
195 ///@}
197 ///@name Bit allocation
198  AC3BitAllocParameters bit_alloc_params; ///< bit allocation parameters
199  int first_cpl_leak; ///< first coupling leak state (firstcplleak)
200  int snr_offset[AC3_MAX_CHANNELS]; ///< signal-to-noise ratio offsets (snroffst)
201  int fast_gain[AC3_MAX_CHANNELS]; ///< fast gain values/SMR's (fgain)
202  uint8_t bap[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< bit allocation pointers
203  int16_t psd[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< scaled exponents
204  int16_t band_psd[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS]; ///< interpolated exponents
205  int16_t mask[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS]; ///< masking curve values
206  int dba_mode[AC3_MAX_CHANNELS]; ///< delta bit allocation mode
207  int dba_nsegs[AC3_MAX_CHANNELS]; ///< number of delta segments
208  uint8_t dba_offsets[AC3_MAX_CHANNELS][8]; ///< delta segment offsets
209  uint8_t dba_lengths[AC3_MAX_CHANNELS][8]; ///< delta segment lengths
210  uint8_t dba_values[AC3_MAX_CHANNELS][8]; ///< delta values for each segment
211 ///@}
213 ///@name Zero-mantissa dithering
214  int dither_flag[AC3_MAX_CHANNELS]; ///< dither flags (dithflg)
215  AVLFG dith_state; ///< for dither generation
216 ///@}
218 ///@name IMDCT
219  int block_switch[AC3_MAX_CHANNELS]; ///< block switch flags (blksw)
220  FFTContext imdct_512; ///< for 512 sample IMDCT
221  FFTContext imdct_256; ///< for 256 sample IMDCT
222 ///@}
224 ///@name Optimization
226 #if USE_FIXED
228 #else
230 #endif
232  FmtConvertContext fmt_conv; ///< optimized conversion functions
233 ///@}
239 ///@name Aligned arrays
240  DECLARE_ALIGNED(16, int, fixed_coeffs)[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< fixed-point transform coefficients
242  DECLARE_ALIGNED(32, INTFLOAT, delay)[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE]; ///< delay - added to the next block
243  DECLARE_ALIGNED(32, INTFLOAT, window)[AC3_BLOCK_SIZE]; ///< window coefficients
244  DECLARE_ALIGNED(32, INTFLOAT, tmp_output)[AC3_BLOCK_SIZE]; ///< temporary storage for output before windowing
245  DECLARE_ALIGNED(32, SHORTFLOAT, output)[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE]; ///< output after imdct transform and windowing
247 ///@}
250 /**
251  * Parse the E-AC-3 frame header.
252  * This parses both the bit stream info and audio frame header.
253  */
256 /**
257  * Decode mantissas in a single channel for the entire frame.
258  * This is used when AHT mode is enabled.
259  */
262 /**
263  * Apply spectral extension to each channel by copying lower frequency
264  * coefficients to higher frequency bins and applying side information to
265  * approximate the original high frequency signal.
266  */
269 #if (!USE_FIXED)
270 extern float ff_ac3_heavy_dynamic_range_tab[256];
271 #endif
273 #endif /* AVCODEC_AC3DEC_H */
Definition: lfg.h:27
INTFLOAT drc_scale
percentage of dynamic range compression to be applied
Definition: ac3dec.h:172
SHORTFLOAT * downmix_coeffs[2]
stereo downmix coefficients
Definition: ac3dec.h:164
int dba_nsegs[AC3_MAX_CHANNELS]
number of delta segments
Definition: ac3dec.h:207
const char * s
Definition: avisynth_c.h:768
temp buffer to prevent overread
Definition: ac3dec.h:246
scaled exponents
Definition: ac3dec.h:203
int spx_in_use
spectral extension in use (spxinu)
Definition: ac3dec.h:140
uint8_t dba_offsets[AC3_MAX_CHANNELS][8]
delta segment offsets
Definition: ac3dec.h:208
int dither_flag[AC3_MAX_CHANNELS]
dither flags (dithflg)
Definition: ac3dec.h:214
masking curve values
Definition: ac3dec.h:205
int preferred_downmix
Preferred 2-channel downmix mode (dmixmod)
Definition: ac3dec.h:91
#define AC3_MAX_COEFS
Definition: ac3.h:34
int channels
number of total channels
Definition: ac3dec.h:162
AVFloatDSPContext * fdsp
Definition: ac3dec.h:229
int spx_dst_end_freq
spx end frequency bin
Definition: ac3dec.h:144
int exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS]
exponent strategies (expstr)
Definition: ac3dec.h:194
int lfe_on
lfe channel in use
Definition: ac3dec.h:86
int block_switch[AC3_MAX_CHANNELS]
block switch flags (blksw)
Definition: ac3dec.h:219
int dba_syntax
delta bit allocation syntax enabled (dbaflde)
Definition: ac3dec.h:120
int preferred_stereo_downmix
Definition: ac3dec.h:106
int dialog_normalization[2]
dialog level in dBFS (dialnorm)
Definition: ac3dec.h:87
int spx_src_start_freq
spx start frequency bin
Definition: ac3dec.h:143
int heavy_compression
apply heavy compression
Definition: ac3dec.h:173
uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]
number of coeffs in each coupling band
Definition: ac3dec.h:132
output after imdct transform and windowing
Definition: ac3dec.h:245
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:96
Definition: aac_defines.h:86
uint8_t spx_band_struct[SPX_MAX_BANDS]
Definition: ac3dec.h:148
float ltrt_center_mix_level
Definition: ac3dec.h:107
int first_cpl_coords[AC3_MAX_CHANNELS]
first coupling coordinates states (firstcplcos)
Definition: ac3dec.h:134
spx noise blending factor (nblendfact)
Definition: ac3dec.h:151
int compression_gain[2]
gain to apply for heavy compression (compr)
Definition: ac3dec.h:89
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:187
int fast_gain[AC3_MAX_CHANNELS]
fast gain values/SMR's (fgain)
Definition: ac3dec.h:201
float ltrt_surround_mix_level
Definition: ac3dec.h:108
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
coupling coordinates (cplco)
Definition: ac3dec.h:135
int num_exp_groups[AC3_MAX_CHANNELS]
Number of exponent groups (nexpgrp)
Definition: ac3dec.h:192
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:118
int phase_flags_in_use
phase flags in use (phsflginu)
Definition: ac3dec.h:128
delay - added to the next block
Definition: ac3dec.h:242
int phase_flags[AC3_MAX_CPL_BANDS]
phase flags (phsflg)
Definition: ac3dec.h:129
int out_channels
number of output channels
Definition: ac3dec.h:167
int channel_map
custom channel map
Definition: ac3dec.h:90
int consistent_noise_generation
seed noise generation with AC-3 frame on decode
Definition: ac3dec.h:183
int substreamid
substream identification
Definition: ac3dec.h:78
FFTContext imdct_256
for 256 sample IMDCT
Definition: ac3dec.h:221
int bit_rate
stream bit rate, in bits-per-second
Definition: ac3dec.h:80
int lfe_ch
index of LFE channel
Definition: ac3dec.h:163
uint8_t first_spx_coords[AC3_MAX_CHANNELS]
first spx coordinates states (firstspxcos)
Definition: ac3dec.h:150
AC3BitAllocParameters bit_alloc_params
bit allocation parameters
Definition: ac3dec.h:198
int dolby_surround_mode
dolby surround mode (dsurmod)
Definition: ac3dec.h:101
GetBitContext gbc
bitstream reader
Definition: ac3dec.h:73
int eac3_subsbtreamid_found
bitstream has E-AC-3 additional substream(s)
Definition: ac3dec.h:100
AC3DSPContext ac3dsp
Definition: ac3dec.h:231
maximum number of channels, including coupling channel
Definition: ac3.h:31
int dolby_headphone_mode
dolby headphone mode (dheadphonmod)
Definition: ac3dec.h:103
float loro_center_mix_level
Definition: ac3dec.h:109
int compression_exists[2]
compression field is valid for frame (compre)
Definition: ac3dec.h:88
transform coefficients
Definition: ac3dec.h:241
int block_switch_syntax
block switch syntax enabled (blkswe)
Definition: ac3dec.h:116
float level_gain[2]
Definition: ac3dec.h:112
int fast_gain_syntax
fast gain codes enabled (frmfgaincode)
Definition: ac3dec.h:119
interpolated exponents
Definition: ac3dec.h:204
uint8_t channel_uses_spx[AC3_MAX_CHANNELS]
channel uses spectral extension (chinspx)
Definition: ac3dec.h:141
#define AC3_BLOCK_SIZE
Definition: ac3.h:35
INTFLOAT dynamic_range[2]
dynamic range
Definition: ac3dec.h:171
window coefficients
Definition: ac3dec.h:243
Definition: ac3dec.h:235
Definition: fft.h:88
BswapDSPContext bdsp
Definition: ac3dec.h:225
int surround_mix_level_ltrt
Surround mix level index for Lt/Rt (ltrtsurmixlev)
Definition: ac3dec.h:95
float loro_surround_mix_level
Definition: ac3dec.h:110
int dither_flag_syntax
dither flag syntax enabled (dithflage)
Definition: ac3dec.h:117
int end_freq[AC3_MAX_CHANNELS]
end frequency bin (endmant)
Definition: ac3dec.h:179
INTFLOAT heavy_dynamic_range[2]
heavy dynamic range compression
Definition: ac3dec.h:174
temporary storage for output before windowing
Definition: ac3dec.h:244
uint8_t dba_values[AC3_MAX_CHANNELS][8]
delta values for each segment
Definition: ac3dec.h:210
FFTContext imdct_512
for 512 sample IMDCT
Definition: ac3dec.h:220
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:127
int fbw_channels
number of full-bandwidth channels
Definition: ac3dec.h:161
int8_t spx_atten_code[AC3_MAX_CHANNELS]
spx attenuation code (spxattencod)
Definition: ac3dec.h:142
Definition: ac3dec.h:236
bit allocation pointers
Definition: ac3dec.h:202
uint8_t cpl_band_struct[AC3_MAX_CPL_BANDS]
Definition: ac3dec.h:131
main external API structure.
Definition: avcodec.h:1488
Definition: ac3.h:39
int num_cpl_bands
number of coupling bands (ncplbnd)
Definition: ac3dec.h:130
int num_spx_bands
number of spx bands (nspxbnds)
Definition: ac3dec.h:147
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:152
Describe the class of an AVClass context structure.
Definition: log.h:67
int bitstream_mode
bitstream mode (bsmod)
Definition: ac3dec.h:84
int center_mix_level_ltrt
Center mix level index for Lt/Rt (ltrtcmixlev)
Definition: ac3dec.h:93
int frame_type
frame type (strmtyp)
Definition: ac3dec.h:77
#define AC3_MAX_BLOCKS
Definition: ac3.h:36
int eac3
indicates if current frame is E-AC-3
Definition: ac3dec.h:98
int channel_uses_aht[AC3_MAX_CHANNELS]
channel AHT in use (chahtinu)
Definition: ac3dec.h:156
uint8_t dba_lengths[AC3_MAX_CHANNELS][8]
delta segment lengths
Definition: ac3dec.h:209
int cpl_in_use[AC3_MAX_BLOCKS]
coupling in use (cplinu)
Definition: ac3dec.h:125
int firstchincpl
first channel in coupling
Definition: ac3dec.h:133
int dba_mode[AC3_MAX_CHANNELS]
delta bit allocation mode
Definition: ac3dec.h:206
int first_cpl_leak
first coupling leak state (firstcplleak)
Definition: ac3dec.h:199
int surround_mix_level
Surround mix level index.
Definition: ac3dec.h:94
int snr_offset[AC3_MAX_CHANNELS]
signal-to-noise ratio offsets (snroffst)
Definition: ac3dec.h:200
int downmixed
indicates if coeffs are currently downmixed
Definition: ac3dec.h:165
Definition: ac3.h:40
Definition: ac3dec.h:237
int num_blocks
number of audio blocks
Definition: ac3dec.h:82
FmtConvertContext fmt_conv
optimized conversion functions
Definition: ac3dec.h:232
Definition: ac3dec.h:65
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:770
int target_level
target level in dBFS
Definition: ac3dec.h:111
pre-IDCT mantissas
Definition: ac3dec.h:157
int rematrixing_flags[4]
rematrixing flags (rematflg)
Definition: ac3dec.h:188
int fixed_coeffs[AC3_MAX_CHANNELS][AC3_MAX_COEFS]
fixed-point transform coefficients
Definition: ac3dec.h:240
uint8_t spx_band_sizes[SPX_MAX_BANDS]
number of bins in each spx band
Definition: ac3dec.h:149
int lfe_mix_level
LFE mix level index (lfemixlevcod)
Definition: ac3dec.h:97
int snr_offset_strategy
SNR offset strategy (snroffststr)
Definition: ac3dec.h:115
int start_freq[AC3_MAX_CHANNELS]
start frequency bin (strtmant)
Definition: ac3dec.h:178
int sample_rate
sample frequency, in Hz
Definition: ac3dec.h:81
int center_mix_level
Center mix level index.
Definition: ac3dec.h:92
int output_mode
output channel configuration
Definition: ac3dec.h:166
int frame_size
current frame size, in bytes
Definition: ac3dec.h:79
int dolby_surround_ex_mode
dolby surround ex mode (dsurexmod)
Definition: ac3dec.h:102
AVLFG dith_state
for dither generation
Definition: ac3dec.h:215
int cpl_strategy_exists[AC3_MAX_BLOCKS]
coupling strategy exists (cplstre)
Definition: ac3dec.h:126
int bitstream_id
bitstream id (bsid)
Definition: ac3dec.h:83
int eac3_frame_dependent_found
bitstream has E-AC-3 dependent frame(s)
Definition: ac3dec.h:99
Common code between the AC-3 encoder and decoder.
int channel_mode
channel mode (acmod)
Definition: ac3dec.h:85
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:145
int skip_syntax
skip field syntax enabled (skipflde)
Definition: ac3dec.h:121
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:193