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FFmpeg/libavfilter/af_afwtdn.c
Anton Khirnov 1e7d2007c3 all: use designated initializers for AVOption.unit 
Makes it robust against adding fields before it, which will be useful in
following commits.

Majority of the patch generated by the following Coccinelle script:

@@
typedef AVOption;
identifier arr_name;
initializer list il;
initializer list[8] il1;
expression tail;
@@
AVOption arr_name[] = { il, { il1,
- tail
+ .unit = tail
}, ...  };

with some manual changes, as the script:
* has trouble with options defined inside macros
* sometimes does not handle options under an #else branch
* sometimes swallows whitespace
2024-02-14 14:53:41 +01:00

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/*
* Copyright (c) 2020 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <float.h>
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "audio.h"
#include "filters.h"
enum WaveletTypes {
SYM2,
SYM4,
RBIOR68,
DEB10,
SYM10,
COIF5,
BL3,
NB_WAVELET_TYPES,
};
/*
* All wavelets coefficients are taken from: http://wavelets.pybytes.com/
*/
static const double bl3_lp[42] = {
0.000146098, -0.000232304, -0.000285414, 0.000462093, 0.000559952,
-0.000927187, -0.001103748, 0.00188212, 0.002186714, -0.003882426,
-0.00435384, 0.008201477, 0.008685294, -0.017982291, -0.017176331,
0.042068328, 0.032080869, -0.110036987, -0.050201753, 0.433923147,
0.766130398, 0.433923147, -0.050201753, -0.110036987, 0.032080869,
0.042068328, -0.017176331, -0.017982291, 0.008685294, 0.008201477,
-0.00435384, -0.003882426, 0.002186714, 0.00188212, -0.001103748,
-0.000927187, 0.000559952, 0.000462093, -0.000285414, -0.000232304,
0.000146098, 0.0,
};
static const double bl3_hp[42] = {
0.0, 0.000146098, 0.000232304, -0.000285414, -0.000462093, 0.000559952,
0.000927187, -0.001103748, -0.00188212, 0.002186714, 0.003882426,
-0.00435384, -0.008201477, 0.008685294, 0.017982291, -0.017176331,
-0.042068328, 0.032080869, 0.110036987, -0.050201753, -0.433923147,
0.766130398, -0.433923147, -0.050201753, 0.110036987, 0.032080869,
-0.042068328, -0.017176331, 0.017982291, 0.008685294, -0.008201477,
-0.00435384, 0.003882426, 0.002186714, -0.00188212, -0.001103748,
0.000927187, 0.000559952, -0.000462093, -0.000285414, 0.000232304,
0.000146098,
};
static const double bl3_ilp[42] = {
0.0, 0.000146098, -0.000232304, -0.000285414, 0.000462093, 0.000559952,
-0.000927187, -0.001103748, 0.00188212, 0.002186714, -0.003882426,
-0.00435384, 0.008201477, 0.008685294, -0.017982291, -0.017176331,
0.042068328, 0.032080869, -0.110036987, -0.050201753, 0.433923147,
0.766130398, 0.433923147, -0.050201753, -0.110036987, 0.032080869,
0.042068328, -0.017176331, -0.017982291, 0.008685294, 0.008201477,
-0.00435384, -0.003882426, 0.002186714, 0.00188212, -0.001103748,
-0.000927187, 0.000559952, 0.000462093, -0.000285414, -0.000232304,
0.000146098,
};
static const double bl3_ihp[42] = {
0.000146098, 0.000232304, -0.000285414, -0.000462093, 0.000559952,
0.000927187, -0.001103748, -0.00188212, 0.002186714, 0.003882426,
-0.00435384, -0.008201477, 0.008685294, 0.017982291, -0.017176331,
-0.042068328, 0.032080869, 0.110036987, -0.050201753, -0.433923147,
0.766130398, -0.433923147, -0.050201753, 0.110036987, 0.032080869,
-0.042068328, -0.017176331, 0.017982291, 0.008685294, -0.008201477,
-0.00435384, 0.003882426, 0.002186714, -0.00188212, -0.001103748,
0.000927187, 0.000559952, -0.000462093, -0.000285414, 0.000232304,
0.000146098,
};
static const double sym10_lp[20] = {
0.0007701598091144901, 9.563267072289475e-05,
-0.008641299277022422, -0.0014653825813050513,
0.0459272392310922, 0.011609893903711381,
-0.15949427888491757, -0.07088053578324385,
0.47169066693843925, 0.7695100370211071,
0.38382676106708546, -0.03553674047381755,
-0.0319900568824278, 0.04999497207737669,
0.005764912033581909, -0.02035493981231129,
-0.0008043589320165449, 0.004593173585311828,
5.7036083618494284e-05, -0.0004593294210046588,
};
static const double sym10_hp[20] = {
0.0004593294210046588, 5.7036083618494284e-05,
-0.004593173585311828, -0.0008043589320165449,
0.02035493981231129, 0.005764912033581909,
-0.04999497207737669, -0.0319900568824278,
0.03553674047381755, 0.38382676106708546,
-0.7695100370211071, 0.47169066693843925,
0.07088053578324385, -0.15949427888491757,
-0.011609893903711381, 0.0459272392310922,
0.0014653825813050513, -0.008641299277022422,
-9.563267072289475e-05, 0.0007701598091144901,
};
static const double sym10_ilp[20] = {
-0.0004593294210046588, 5.7036083618494284e-05,
0.004593173585311828, -0.0008043589320165449,
-0.02035493981231129, 0.005764912033581909,
0.04999497207737669, -0.0319900568824278,
-0.03553674047381755, 0.38382676106708546,
0.7695100370211071, 0.47169066693843925,
-0.07088053578324385, -0.15949427888491757,
0.011609893903711381, 0.0459272392310922,
-0.0014653825813050513, -0.008641299277022422,
9.563267072289475e-05, 0.0007701598091144901,
};
static const double sym10_ihp[20] = {
0.0007701598091144901, -9.563267072289475e-05,
-0.008641299277022422, 0.0014653825813050513,
0.0459272392310922, -0.011609893903711381,
-0.15949427888491757, 0.07088053578324385,
0.47169066693843925, -0.7695100370211071,
0.38382676106708546, 0.03553674047381755,
-0.0319900568824278, -0.04999497207737669,
0.005764912033581909, 0.02035493981231129,
-0.0008043589320165449, -0.004593173585311828,
5.7036083618494284e-05, 0.0004593294210046588,
};
static const double rbior68_lp[18] = {
0.0, 0.0, 0.0, 0.0,
0.014426282505624435, 0.014467504896790148,
-0.07872200106262882, -0.04036797903033992,
0.41784910915027457, 0.7589077294536541,
0.41784910915027457, -0.04036797903033992,
-0.07872200106262882, 0.014467504896790148,
0.014426282505624435, 0.0, 0.0, 0.0,
};
static const double rbior68_hp[18] = {
-0.0019088317364812906, -0.0019142861290887667,
0.016990639867602342, 0.01193456527972926,
-0.04973290349094079, -0.07726317316720414,
0.09405920349573646, 0.4207962846098268,
-0.8259229974584023, 0.4207962846098268,
0.09405920349573646, -0.07726317316720414,
-0.04973290349094079, 0.01193456527972926,
0.016990639867602342, -0.0019142861290887667,
-0.0019088317364812906, 0.0,
};
static const double rbior68_ilp[18] = {
0.0019088317364812906, -0.0019142861290887667,
-0.016990639867602342, 0.01193456527972926,
0.04973290349094079, -0.07726317316720414,
-0.09405920349573646, 0.4207962846098268,
0.8259229974584023, 0.4207962846098268,
-0.09405920349573646, -0.07726317316720414,
0.04973290349094079, 0.01193456527972926,
-0.016990639867602342, -0.0019142861290887667,
0.0019088317364812906, 0.0,
};
static const double rbior68_ihp[18] = {
0.0, 0.0, 0.0, 0.0,
0.014426282505624435, -0.014467504896790148,
-0.07872200106262882, 0.04036797903033992,
0.41784910915027457, -0.7589077294536541,
0.41784910915027457, 0.04036797903033992,
-0.07872200106262882, -0.014467504896790148,
0.014426282505624435, 0.0, 0.0, 0.0,
};
static const double coif5_lp[30] = {
-9.517657273819165e-08, -1.6744288576823017e-07,
2.0637618513646814e-06, 3.7346551751414047e-06,
-2.1315026809955787e-05, -4.134043227251251e-05,
0.00014054114970203437, 0.00030225958181306315,
-0.0006381313430451114, -0.0016628637020130838,
0.0024333732126576722, 0.006764185448053083,
-0.009164231162481846, -0.01976177894257264,
0.03268357426711183, 0.0412892087501817,
-0.10557420870333893, -0.06203596396290357,
0.4379916261718371, 0.7742896036529562,
0.4215662066908515, -0.05204316317624377,
-0.09192001055969624, 0.02816802897093635,
0.023408156785839195, -0.010131117519849788,
-0.004159358781386048, 0.0021782363581090178,
0.00035858968789573785, -0.00021208083980379827,
};
static const double coif5_hp[30] = {
0.00021208083980379827, 0.00035858968789573785,
-0.0021782363581090178, -0.004159358781386048,
0.010131117519849788, 0.023408156785839195,
-0.02816802897093635, -0.09192001055969624,
0.05204316317624377, 0.4215662066908515,
-0.7742896036529562, 0.4379916261718371,
0.06203596396290357, -0.10557420870333893,
-0.0412892087501817, 0.03268357426711183,
0.01976177894257264, -0.009164231162481846,
-0.006764185448053083, 0.0024333732126576722,
0.0016628637020130838, -0.0006381313430451114,
-0.00030225958181306315, 0.00014054114970203437,
4.134043227251251e-05, -2.1315026809955787e-05,
-3.7346551751414047e-06, 2.0637618513646814e-06,
1.6744288576823017e-07, -9.517657273819165e-08,
};
static const double coif5_ilp[30] = {
-0.00021208083980379827, 0.00035858968789573785,
0.0021782363581090178, -0.004159358781386048,
-0.010131117519849788, 0.023408156785839195,
0.02816802897093635, -0.09192001055969624,
-0.05204316317624377, 0.4215662066908515,
0.7742896036529562, 0.4379916261718371,
-0.06203596396290357, -0.10557420870333893,
0.0412892087501817, 0.03268357426711183,
-0.01976177894257264, -0.009164231162481846,
0.006764185448053083, 0.0024333732126576722,
-0.0016628637020130838, -0.0006381313430451114,
0.00030225958181306315, 0.00014054114970203437,
-4.134043227251251e-05, -2.1315026809955787e-05,
3.7346551751414047e-06, 2.0637618513646814e-06,
-1.6744288576823017e-07, -9.517657273819165e-08,
};
static const double coif5_ihp[30] = {
-9.517657273819165e-08, 1.6744288576823017e-07,
2.0637618513646814e-06, -3.7346551751414047e-06,
-2.1315026809955787e-05, 4.134043227251251e-05,
0.00014054114970203437, -0.00030225958181306315,
-0.0006381313430451114, 0.0016628637020130838,
0.0024333732126576722, -0.006764185448053083,
-0.009164231162481846, 0.01976177894257264,
0.03268357426711183, -0.0412892087501817,
-0.10557420870333893, 0.06203596396290357,
0.4379916261718371, -0.7742896036529562,
0.4215662066908515, 0.05204316317624377,
-0.09192001055969624, -0.02816802897093635,
0.023408156785839195, 0.010131117519849788,
-0.004159358781386048, -0.0021782363581090178,
0.00035858968789573785, 0.00021208083980379827,
};
static const double deb10_lp[20] = {
-1.326420300235487e-05, 9.358867000108985e-05,
-0.0001164668549943862, -0.0006858566950046825,
0.00199240529499085, 0.0013953517469940798,
-0.010733175482979604, 0.0036065535669883944,
0.03321267405893324, -0.02945753682194567,
-0.07139414716586077, 0.09305736460380659,
0.12736934033574265, -0.19594627437659665,
-0.24984642432648865, 0.2811723436604265,
0.6884590394525921, 0.5272011889309198,
0.18817680007762133, 0.026670057900950818,
};
static const double deb10_hp[20] = {
-0.026670057900950818, 0.18817680007762133,
-0.5272011889309198, 0.6884590394525921,
-0.2811723436604265, -0.24984642432648865,
0.19594627437659665, 0.12736934033574265,
-0.09305736460380659, -0.07139414716586077,
0.02945753682194567, 0.03321267405893324,
-0.0036065535669883944, -0.010733175482979604,
-0.0013953517469940798, 0.00199240529499085,
0.0006858566950046825, -0.0001164668549943862,
-9.358867000108985e-05, -1.326420300235487e-05,
};
static const double deb10_ilp[20] = {
0.026670057900950818, 0.18817680007762133,
0.5272011889309198, 0.6884590394525921,
0.2811723436604265, -0.24984642432648865,
-0.19594627437659665, 0.12736934033574265,
0.09305736460380659, -0.07139414716586077,
-0.02945753682194567, 0.03321267405893324,
0.0036065535669883944, -0.010733175482979604,
0.0013953517469940798, 0.00199240529499085,
-0.0006858566950046825, -0.0001164668549943862,
9.358867000108985e-05, -1.326420300235487e-05,
};
static const double deb10_ihp[20] = {
-1.326420300235487e-05, -9.358867000108985e-05,
-0.0001164668549943862, 0.0006858566950046825,
0.00199240529499085, -0.0013953517469940798,
-0.010733175482979604, -0.0036065535669883944,
0.03321267405893324, 0.02945753682194567,
-0.07139414716586077, -0.09305736460380659,
0.12736934033574265, 0.19594627437659665,
-0.24984642432648865, -0.2811723436604265,
0.6884590394525921, -0.5272011889309198,
0.18817680007762133, -0.026670057900950818,
};
static const double sym4_lp[8] = {
-0.07576571478927333,
-0.02963552764599851,
0.49761866763201545,
0.8037387518059161,
0.29785779560527736,
-0.09921954357684722,
-0.012603967262037833,
0.0322231006040427,
};
static const double sym4_hp[8] = {
-0.0322231006040427,
-0.012603967262037833,
0.09921954357684722,
0.29785779560527736,
-0.8037387518059161,
0.49761866763201545,
0.02963552764599851,
-0.07576571478927333,
};
static const double sym4_ilp[8] = {
0.0322231006040427,
-0.012603967262037833,
-0.09921954357684722,
0.29785779560527736,
0.8037387518059161,
0.49761866763201545,
-0.02963552764599851,
-0.07576571478927333,
};
static const double sym4_ihp[8] = {
-0.07576571478927333,
0.02963552764599851,
0.49761866763201545,
-0.8037387518059161,
0.29785779560527736,
0.09921954357684722,
-0.012603967262037833,
-0.0322231006040427,
};
static const double sym2_lp[4] = {
-0.12940952255092145, 0.22414386804185735,
0.836516303737469, 0.48296291314469025,
};
static const double sym2_hp[4] = {
-0.48296291314469025, 0.836516303737469,
-0.22414386804185735, -0.12940952255092145,
};
static const double sym2_ilp[4] = {
0.48296291314469025, 0.836516303737469,
0.22414386804185735, -0.12940952255092145,
};
static const double sym2_ihp[4] = {
-0.12940952255092145, -0.22414386804185735,
0.836516303737469, -0.48296291314469025,
};
#define MAX_LEVELS 13
typedef struct ChannelParams {
int *output_length;
int *filter_length;
double **output_coefs;
double **subbands_to_free;
double **filter_coefs;
int tempa_length;
int tempa_len_max;
int temp_in_length;
int temp_in_max_length;
int buffer_length;
int min_left_ext;
int max_left_ext;
double *tempa;
double *tempd;
double *temp_in;
double *buffer;
double *buffer2;
double *prev;
double *overlap;
} ChannelParams;
typedef struct AudioFWTDNContext {
const AVClass *class;
double sigma;
double percent;
double softness;
uint64_t sn;
int64_t eof_pts;
int eof;
int wavelet_type;
int channels;
int nb_samples;
int levels;
int wavelet_length;
int need_profile;
int got_profile;
int adaptive;
int delay;
int drop_samples;
int padd_samples;
int overlap_length;
int prev_length;
ChannelParams *cp;
const double *lp, *hp;
const double *ilp, *ihp;
AVFrame *stddev, *absmean, *filter;
AVFrame *new_stddev, *new_absmean;
int (*filter_channel)(AVFilterContext *ctx, void *arg, int ch, int nb_jobs);
} AudioFWTDNContext;
#define OFFSET(x) offsetof(AudioFWTDNContext, x)
#define AF AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define AFR AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption afwtdn_options[] = {
{ "sigma", "set noise sigma", OFFSET(sigma), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, AFR },
{ "levels", "set number of wavelet levels", OFFSET(levels), AV_OPT_TYPE_INT, {.i64=10}, 1, MAX_LEVELS-1, AF },
{ "wavet", "set wavelet type", OFFSET(wavelet_type), AV_OPT_TYPE_INT, {.i64=SYM10}, 0, NB_WAVELET_TYPES - 1, AF, .unit = "wavet" },
{ "sym2", "sym2", 0, AV_OPT_TYPE_CONST, {.i64=SYM2}, 0, 0, AF, .unit = "wavet" },
{ "sym4", "sym4", 0, AV_OPT_TYPE_CONST, {.i64=SYM4}, 0, 0, AF, .unit = "wavet" },
{ "rbior68", "rbior68", 0, AV_OPT_TYPE_CONST, {.i64=RBIOR68}, 0, 0, AF, .unit = "wavet" },
{ "deb10", "deb10", 0, AV_OPT_TYPE_CONST, {.i64=DEB10}, 0, 0, AF, .unit = "wavet" },
{ "sym10", "sym10", 0, AV_OPT_TYPE_CONST, {.i64=SYM10}, 0, 0, AF, .unit = "wavet" },
{ "coif5", "coif5", 0, AV_OPT_TYPE_CONST, {.i64=COIF5}, 0, 0, AF, .unit = "wavet" },
{ "bl3", "bl3", 0, AV_OPT_TYPE_CONST, {.i64=BL3}, 0, 0, AF, .unit = "wavet" },
{ "percent", "set percent of full denoising", OFFSET(percent),AV_OPT_TYPE_DOUBLE, {.dbl=85}, 0, 100, AFR },
{ "profile", "profile noise", OFFSET(need_profile), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AFR },
{ "adaptive", "adaptive profiling of noise", OFFSET(adaptive), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AFR },
{ "samples", "set frame size in number of samples", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=8192}, 512, 65536, AF },
{ "softness", "set thresholding softness", OFFSET(softness), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 10, AFR },
{ NULL }
};
AVFILTER_DEFINE_CLASS(afwtdn);
#define pow2(x) (1U << (x))
#define mod_pow2(x, power_of_two) ((x) & ((power_of_two) - 1))
static void conv_down(double *in, int in_length, double *low, double *high,
int out_length, const double *lp, const double *hp,
int wavelet_length, int skip,
double *buffer, int buffer_length)
{
double thigh = 0.0, tlow = 0.0;
int buff_idx = 1 + skip;
memcpy(buffer, in, buff_idx * sizeof(*buffer));
memset(buffer + buff_idx, 0, (buffer_length - buff_idx) * sizeof(*buffer));
for (int i = 0; i < out_length - 1; i++) {
double thigh = 0.0, tlow = 0.0;
for (int j = 0; j < wavelet_length; j++) {
const int idx = mod_pow2(-j + buff_idx - 1, buffer_length);
const double btemp = buffer[idx];
thigh += btemp * hp[j];
tlow += btemp * lp[j];
}
high[i] = thigh;
low[i] = tlow;
buffer[buff_idx++] = in[2 * i + 1 + skip];
buffer[buff_idx++] = in[2 * i + 2 + skip];
buff_idx = mod_pow2(buff_idx, buffer_length);
}
for (int i = 0; i < wavelet_length; i++) {
const int idx = mod_pow2(-i + buff_idx - 1, buffer_length);
const double btemp = buffer[idx];
thigh += btemp * hp[i];
tlow += btemp * lp[i];
}
high[out_length - 1] = thigh;
low[out_length - 1] = tlow;
}
static int left_ext(int wavelet_length, int levels, uint64_t sn)
{
if (!sn)
return 0;
return (pow2(levels) - 1) * (wavelet_length - 2) + mod_pow2(sn, pow2(levels));
}
static int nb_coefs(int length, int level, uint64_t sn)
{
const int pow2_level = pow2(level);
return (sn + length) / pow2_level - sn / pow2_level;
}
static int reallocate_inputs(double **out, int *out_length,
int in_length, int levels, int ch, uint64_t sn)
{
const int temp_length = nb_coefs(in_length, levels, sn);
for (int level = 0; level < levels; level++) {
const int temp_length = nb_coefs(in_length, level + 1, sn);
if (temp_length > out_length[level]) {
av_freep(&out[level]);
out_length[level] = 0;
out[level] = av_calloc(temp_length + 1, sizeof(**out));
if (!out[level])
return AVERROR(ENOMEM);
out_length[level] = temp_length + 1;
}
memset(out[level] + temp_length, 0,
(out_length[level] - temp_length) * sizeof(**out));
out_length[level] = temp_length;
}
if (temp_length > out_length[levels]) {
av_freep(&out[levels]);
out_length[levels] = 0;
out[levels] = av_calloc(temp_length + 1, sizeof(**out));
if (!out[levels])
return AVERROR(ENOMEM);
out_length[levels] = temp_length + 1;
}
memset(out[levels] + temp_length, 0,
(out_length[levels] - temp_length) * sizeof(**out));
out_length[levels] = temp_length;
return 0;
}
static int max_left_zeros_inverse(int levels, int level, int wavelet_length)
{
return (pow2(levels - level) - 1) * (wavelet_length - 1);
}
static int reallocate_outputs(AudioFWTDNContext *s,
double **out, int *out_length,
int in_length, int levels, int ch, uint64_t sn)
{
ChannelParams *cp = &s->cp[ch];
int temp_length = 0;
int add = 0;
for (int level = 0; level < levels; level++) {
temp_length = nb_coefs(in_length, level + 1, sn);
if (temp_length > out_length[level]) {
av_freep(&cp->subbands_to_free[level]);
out_length[level] = 0;
add = max_left_zeros_inverse(levels, level + 1, s->wavelet_length);
cp->subbands_to_free[level] = av_calloc(add + temp_length + 1, sizeof(**out));
if (!cp->subbands_to_free[level])
return AVERROR(ENOMEM);
out_length[level] = add + temp_length + 1;
out[level] = cp->subbands_to_free[level] + add;
}
memset(out[level] + temp_length, 0,
FFMAX(out_length[level] - temp_length - add, 0) * sizeof(**out));
out_length[level] = temp_length;
}
temp_length = nb_coefs(in_length, levels, sn);
if (temp_length > out_length[levels]) {
av_freep(&cp->subbands_to_free[levels]);
out_length[levels] = 0;
cp->subbands_to_free[levels] = av_calloc(temp_length + 1, sizeof(**out));
if (!cp->subbands_to_free[levels])
return AVERROR(ENOMEM);
out_length[levels] = temp_length + 1;
out[levels] = cp->subbands_to_free[levels];
}
memset(out[levels] + temp_length, 0,
(out_length[levels] - temp_length) * sizeof(**out));
out_length[levels] = temp_length;
return 0;
}
static int discard_left_ext(int wavelet_length, int levels, int level, uint64_t sn)
{
if (levels == level || sn == 0)
return 0;
return (pow2(levels - level) - 1) * (wavelet_length - 2) + mod_pow2(sn, pow2(levels)) / pow2(level);
}
static int forward(AudioFWTDNContext *s,
const double *in, int in_length,
double **out, int *out_length, int ch, uint64_t sn)
{
ChannelParams *cp = &s->cp[ch];
int levels = s->levels;
int skip = sn ? s->wavelet_length - 1 : 1;
int leftext, ret;
ret = reallocate_inputs(out, out_length, in_length, levels, ch, sn);
if (ret < 0)
return ret;
ret = reallocate_outputs(s, cp->filter_coefs, cp->filter_length,
in_length, levels, ch, sn);
if (ret < 0)
return ret;
leftext = left_ext(s->wavelet_length, levels, sn);
if (cp->temp_in_max_length < in_length + cp->max_left_ext + skip) {
av_freep(&cp->temp_in);
cp->temp_in_max_length = in_length + cp->max_left_ext + skip;
cp->temp_in = av_calloc(cp->temp_in_max_length, sizeof(*cp->temp_in));
if (!cp->temp_in) {
cp->temp_in_max_length = 0;
return AVERROR(ENOMEM);
}
}
memset(cp->temp_in, 0, cp->temp_in_max_length * sizeof(*cp->temp_in));
cp->temp_in_length = in_length + leftext;
if (leftext)
memcpy(cp->temp_in, cp->prev + s->prev_length - leftext, leftext * sizeof(*cp->temp_in));
memcpy(cp->temp_in + leftext, in, in_length * sizeof(*in));
if (levels == 1) {
conv_down(cp->temp_in, cp->temp_in_length, out[1], out[0], out_length[1],
s->lp, s->hp, s->wavelet_length, skip,
cp->buffer, cp->buffer_length);
} else {
int discard = discard_left_ext(s->wavelet_length, levels, 1, sn);
int tempa_length_prev;
if (cp->tempa_len_max < (in_length + cp->max_left_ext + s->wavelet_length - 1) / 2) {
av_freep(&cp->tempa);
av_freep(&cp->tempd);
cp->tempa_len_max = (in_length + cp->max_left_ext + s->wavelet_length - 1) / 2;
cp->tempa = av_calloc(cp->tempa_len_max, sizeof(*cp->tempa));
cp->tempd = av_calloc(cp->tempa_len_max, sizeof(*cp->tempd));
if (!cp->tempa || !cp->tempd) {
cp->tempa_len_max = 0;
return AVERROR(ENOMEM);
}
}
memset(cp->tempa, 0, cp->tempa_len_max * sizeof(*cp->tempa));
memset(cp->tempd, 0, cp->tempa_len_max * sizeof(*cp->tempd));
cp->tempa_length = out_length[0] + discard;
conv_down(cp->temp_in, cp->temp_in_length,
cp->tempa, cp->tempd, cp->tempa_length,
s->lp, s->hp, s->wavelet_length, skip,
cp->buffer, cp->buffer_length);
memcpy(out[0], cp->tempd + discard, out_length[0] * sizeof(**out));
tempa_length_prev = cp->tempa_length;
for (int level = 1; level < levels - 1; level++) {
if (out_length[level] == 0)
return 0;
discard = discard_left_ext(s->wavelet_length, levels, level + 1, sn);
cp->tempa_length = out_length[level] + discard;
conv_down(cp->tempa, tempa_length_prev,
cp->tempa, cp->tempd, cp->tempa_length,
s->lp, s->hp, s->wavelet_length, skip,
cp->buffer, cp->buffer_length);
memcpy(out[level], cp->tempd + discard, out_length[level] * sizeof(**out));
tempa_length_prev = cp->tempa_length;
}
if (out_length[levels] == 0)
return 0;
conv_down(cp->tempa, cp->tempa_length, out[levels], out[levels - 1], out_length[levels],
s->lp, s->hp, s->wavelet_length, skip,
cp->buffer, cp->buffer_length);
}
if (s->prev_length < in_length) {
memcpy(cp->prev, in + in_length - cp->max_left_ext, cp->max_left_ext * sizeof(*cp->prev));
} else {
memmove(cp->prev, cp->prev + in_length, (s->prev_length - in_length) * sizeof(*cp->prev));
memcpy(cp->prev + s->prev_length - in_length, in, in_length * sizeof(*cp->prev));
}
return 0;
}
static void conv_up(double *low, double *high, int in_length, double *out, int out_length,
const double *lp, const double *hp, int filter_length,
double *buffer, double *buffer2, int buffer_length)
{
int shift = 0, buff_idx = 0, in_idx = 0;
memset(buffer, 0, buffer_length * sizeof(*buffer));
memset(buffer2, 0, buffer_length * sizeof(*buffer2));
for (int i = 0; i < out_length; i++) {
double sum = 0.0;
if ((i & 1) == 0) {
if (in_idx < in_length) {
buffer[buff_idx] = low[in_idx];
buffer2[buff_idx] = high[in_idx++];
} else {
buffer[buff_idx] = 0;
buffer2[buff_idx] = 0;
}
buff_idx++;
if (buff_idx >= buffer_length)
buff_idx = 0;
shift = 0;
}
for (int j = 0; j < (filter_length - shift + 1) / 2; j++) {
const int idx = mod_pow2(-j + buff_idx - 1, buffer_length);
sum += buffer[idx] * lp[j * 2 + shift] + buffer2[idx] * hp[j * 2 + shift];
}
out[i] = sum;
shift = 1;
}
}
static int append_left_ext(int wavelet_length, int levels, int level, uint64_t sn)
{
if (levels == level)
return 0;
return (pow2(levels - level) - 1) * (wavelet_length - 2) +
mod_pow2(sn, pow2(levels)) / pow2(level);
}
static int inverse(AudioFWTDNContext *s,
double **in, int *in_length,
double *out, int out_length, int ch, uint64_t sn)
{
ChannelParams *cp = &s->cp[ch];
const int levels = s->levels;
int leftext = left_ext(s->wavelet_length, levels, sn);
int temp_skip = 0;
if (sn == 0)
temp_skip = cp->min_left_ext;
memset(out, 0, out_length * sizeof(*out));
if (cp->temp_in_max_length < out_length + cp->max_left_ext + s->wavelet_length - 1) {
av_freep(&cp->temp_in);
cp->temp_in_max_length = out_length + cp->max_left_ext + s->wavelet_length - 1;
cp->temp_in = av_calloc(cp->temp_in_max_length, sizeof(*cp->temp_in));
if (!cp->temp_in) {
cp->temp_in_max_length = 0;
return AVERROR(ENOMEM);
}
}
memset(cp->temp_in, 0, cp->temp_in_max_length * sizeof(*cp->temp_in));
cp->temp_in_length = out_length + cp->max_left_ext;
if (levels == 1) {
conv_up(in[1], in[0], in_length[1], cp->temp_in, cp->temp_in_length,
s->ilp, s->ihp, s->wavelet_length,
cp->buffer, cp->buffer2, cp->buffer_length);
memcpy(out + cp->max_left_ext - leftext, cp->temp_in + temp_skip,
FFMAX(0, out_length - (cp->max_left_ext - leftext)) * sizeof(*out));
} else {
double *hp1, *hp2;
int add, add2;
if (cp->tempa_len_max < (out_length + cp->max_left_ext + s->wavelet_length - 1) / 2) {
av_freep(&cp->tempa);
cp->tempa_len_max = (out_length + cp->max_left_ext + s->wavelet_length - 1) / 2;
cp->tempa = av_calloc(cp->tempa_len_max, sizeof(*cp->tempa));
if (!cp->tempa) {
cp->tempa_len_max = 0;
return AVERROR(ENOMEM);
}
}
memset(cp->tempa, 0, cp->tempa_len_max * sizeof(*cp->tempa));
hp1 = levels & 1 ? cp->temp_in : cp->tempa;
hp2 = levels & 1 ? cp->tempa : cp->temp_in;
add = append_left_ext(s->wavelet_length, levels, levels - 1, sn);
conv_up(in[levels], in[levels - 1], in_length[levels], hp1, in_length[levels - 2] + add,
s->ilp, s->ihp, s->wavelet_length, cp->buffer, cp->buffer2, cp->buffer_length);
for (int level = levels - 1; level > 1; level--) {
add2 = append_left_ext(s->wavelet_length, levels, level - 1, sn);
add = append_left_ext(s->wavelet_length, levels, level, sn);
conv_up(hp1, in[level - 1] - add, in_length[level - 1] + add,
hp2, in_length[level - 2] + add2,
s->ilp, s->ihp, s->wavelet_length,
cp->buffer, cp->buffer2, cp->buffer_length);
FFSWAP(double *, hp1, hp2);
}
add = append_left_ext(s->wavelet_length, levels, 1, sn);
conv_up(hp1, in[0] - add, in_length[0] + add, cp->temp_in, cp->temp_in_length,
s->ilp, s->ihp, s->wavelet_length,
cp->buffer, cp->buffer2, cp->buffer_length);
}
memset(cp->temp_in, 0, temp_skip * sizeof(*cp->temp_in));
if (s->overlap_length <= out_length) {
memcpy(out + cp->max_left_ext - leftext, cp->temp_in + temp_skip,
FFMAX(0, out_length - (cp->max_left_ext - leftext)) * sizeof(*out));
for (int i = 0;i < FFMIN(s->overlap_length, out_length); i++)
out[i] += cp->overlap[i];
memcpy(cp->overlap, cp->temp_in + out_length - (cp->max_left_ext - leftext),
s->overlap_length * sizeof(*cp->overlap));
} else {
for (int i = 0;i < s->overlap_length - (cp->max_left_ext - leftext); i++)
cp->overlap[i + cp->max_left_ext - leftext] += cp->temp_in[i];
memcpy(out, cp->overlap, out_length * sizeof(*out));
memmove(cp->overlap, cp->overlap + out_length,
(s->overlap_length - out_length) * sizeof(*cp->overlap));
memcpy(cp->overlap + s->overlap_length - out_length, cp->temp_in + leftext,
out_length * sizeof(*cp->overlap));
}
return 0;
}
static int next_pow2(int in)
{
return 1 << (av_log2(in) + 1);
}
static void denoise_level(double *out, const double *in,
const double *filter,
double percent, int length)
{
const double x = percent * 0.01;
const double y = 1.0 - x;
for (int i = 0; i < length; i++)
out[i] = x * filter[i] + in[i] * y;
}
static double sqr(double in)
{
return in * in;
}
static double measure_mean(const double *in, int length)
{
double sum = 0.0;
for (int i = 0; i < length; i++)
sum += in[i];
return sum / length;
}
static double measure_absmean(const double *in, int length)
{
double sum = 0.0;
for (int i = 0; i < length; i++)
sum += fabs(in[i]);
return sum / length;
}
static double measure_stddev(const double *in, int length, double mean)
{
double sum = 0.;
for (int i = 0; i < length; i++) {
sum += sqr(in[i] - mean);
}
return sqrt(sum / length);
}
static void noise_filter(const double stddev, const double *in,
double *out, double absmean, double softness,
double new_stddev, int length)
{
for (int i = 0; i < length; i++) {
if (new_stddev <= stddev)
out[i] = 0.0;
else if (fabs(in[i]) <= absmean)
out[i] = 0.0;
else
out[i] = in[i] - FFSIGN(in[i]) * absmean / exp(3.0 * softness * (fabs(in[i]) - absmean) / absmean);
}
}
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
static int filter_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
{
AudioFWTDNContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame *in = td->in;
AVFrame *out = td->out;
ChannelParams *cp = &s->cp[ch];
const double *src = (const double *)(in->extended_data[ch]);
double *dst = (double *)out->extended_data[ch];
double *absmean = (double *)s->absmean->extended_data[ch];
double *new_absmean = (double *)s->new_absmean->extended_data[ch];
double *stddev = (double *)s->stddev->extended_data[ch];
double *new_stddev = (double *)s->new_stddev->extended_data[ch];
double *filter = (double *)s->filter->extended_data[ch];
double is_noise = 0.0;
int ret;
ret = forward(s, src, in->nb_samples, cp->output_coefs, cp->output_length, ch, s->sn);
if (ret < 0)
return ret;
if (!s->got_profile && s->need_profile) {
for (int level = 0; level <= s->levels; level++) {
const int length = cp->output_length[level];
const double scale = sqrt(2.0 * log(length));
stddev[level] = measure_stddev(cp->output_coefs[level], length,
measure_mean(cp->output_coefs[level], length)) * scale;
absmean[level] = measure_absmean(cp->output_coefs[level], length) * scale;
}
} else if (!s->got_profile && !s->need_profile && !s->adaptive) {
for (int level = 0; level <= s->levels; level++) {
const int length = cp->output_length[level];
const double scale = sqrt(2.0 * log(length));
stddev[level] = 0.5 * s->sigma * scale;
absmean[level] = 0.5 * s->sigma * scale;
}
}
for (int level = 0; level <= s->levels; level++) {
const int length = cp->output_length[level];
double vad;
new_stddev[level] = measure_stddev(cp->output_coefs[level], length,
measure_mean(cp->output_coefs[level], length));
new_absmean[level] = measure_absmean(cp->output_coefs[level], length);
if (new_absmean[level] <= FLT_EPSILON)
vad = 1.0;
else
vad = new_stddev[level] / new_absmean[level];
if (level < s->levels)
is_noise += sqr(vad - 1.232);
}
is_noise *= in->sample_rate;
is_noise /= s->nb_samples;
for (int level = 0; level <= s->levels; level++) {
const double percent = ctx->is_disabled ? 0. : s->percent;
const int length = cp->output_length[level];
const double scale = sqrt(2.0 * log(length));
if (is_noise < 0.05 && s->adaptive) {
stddev[level] = new_stddev[level] * scale;
absmean[level] = new_absmean[level] * scale;
}
noise_filter(stddev[level], cp->output_coefs[level], filter, absmean[level],
s->softness, new_stddev[level], length);
denoise_level(cp->filter_coefs[level], cp->output_coefs[level], filter, percent, length);
}
ret = inverse(s, cp->filter_coefs, cp->filter_length, dst, out->nb_samples, ch, s->sn);
if (ret < 0)
return ret;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AudioFWTDNContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
ThreadData td;
AVFrame *out;
int eof = in == NULL;
out = ff_get_audio_buffer(outlink, s->nb_samples);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
if (in) {
av_frame_copy_props(out, in);
s->eof_pts = in->pts + in->nb_samples;
}
if (eof)
out->pts = s->eof_pts - s->padd_samples;
if (!in || in->nb_samples < s->nb_samples) {
AVFrame *new_in = ff_get_audio_buffer(outlink, s->nb_samples);
if (!new_in) {
av_frame_free(&in);
av_frame_free(&out);
return AVERROR(ENOMEM);
}
if (in)
av_frame_copy_props(new_in, in);
s->padd_samples -= s->nb_samples - (in ? in->nb_samples: 0);
if (in)
av_samples_copy(new_in->extended_data, in->extended_data, 0, 0,
in->nb_samples, in->ch_layout.nb_channels, in->format);
av_frame_free(&in);
in = new_in;
}
td.in = in;
td.out = out;
ff_filter_execute(ctx, s->filter_channel, &td, NULL, inlink->ch_layout.nb_channels);
if (s->need_profile)
s->got_profile = 1;
s->sn += s->nb_samples;
if (s->drop_samples >= in->nb_samples) {
s->drop_samples -= in->nb_samples;
s->delay += in->nb_samples;
av_frame_free(&in);
av_frame_free(&out);
FF_FILTER_FORWARD_STATUS(inlink, outlink);
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return 0;
} else if (s->drop_samples > 0) {
for (int ch = 0; ch < out->ch_layout.nb_channels; ch++) {
memmove(out->extended_data[ch],
out->extended_data[ch] + s->drop_samples * sizeof(double),
(in->nb_samples - s->drop_samples) * sizeof(double));
}
out->nb_samples = in->nb_samples - s->drop_samples;
out->pts = in->pts - av_rescale_q(s->delay, (AVRational){1, outlink->sample_rate}, outlink->time_base);
s->delay += s->drop_samples;
s->drop_samples = 0;
} else {
if (s->padd_samples < 0 && eof) {
out->nb_samples = FFMAX(0, out->nb_samples + s->padd_samples);
s->padd_samples = 0;
}
if (!eof)
out->pts = in->pts - av_rescale_q(s->delay, (AVRational){1, outlink->sample_rate}, outlink->time_base);
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int max_left_ext(int wavelet_length, int levels)
{
return (pow2(levels) - 1) * (wavelet_length - 1);
}
static int min_left_ext(int wavelet_length, int levels)
{
return (pow2(levels) - 1) * (wavelet_length - 2);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AudioFWTDNContext *s = ctx->priv;
switch (s->wavelet_type) {
case SYM2:
s->wavelet_length = 4;
s->lp = sym2_lp;
s->hp = sym2_hp;
s->ilp = sym2_ilp;
s->ihp = sym2_ihp;
break;
case SYM4:
s->wavelet_length = 8;
s->lp = sym4_lp;
s->hp = sym4_hp;
s->ilp = sym4_ilp;
s->ihp = sym4_ihp;
break;
case RBIOR68:
s->wavelet_length = 18;
s->lp = rbior68_lp;
s->hp = rbior68_hp;
s->ilp = rbior68_ilp;
s->ihp = rbior68_ihp;
break;
case DEB10:
s->wavelet_length = 20;
s->lp = deb10_lp;
s->hp = deb10_hp;
s->ilp = deb10_ilp;
s->ihp = deb10_ihp;
break;
case SYM10:
s->wavelet_length = 20;
s->lp = sym10_lp;
s->hp = sym10_hp;
s->ilp = sym10_ilp;
s->ihp = sym10_ihp;
break;
case COIF5:
s->wavelet_length = 30;
s->lp = coif5_lp;
s->hp = coif5_hp;
s->ilp = coif5_ilp;
s->ihp = coif5_ihp;
break;
case BL3:
s->wavelet_length = 42;
s->lp = bl3_lp;
s->hp = bl3_hp;
s->ilp = bl3_ilp;
s->ihp = bl3_ihp;
break;
default:
av_assert0(0);
}
s->levels = FFMIN(s->levels, lrint(log(s->nb_samples / (s->wavelet_length - 1.0)) / M_LN2));
av_log(ctx, AV_LOG_VERBOSE, "levels: %d\n", s->levels);
s->filter_channel = filter_channel;
s->stddev = ff_get_audio_buffer(outlink, MAX_LEVELS);
s->new_stddev = ff_get_audio_buffer(outlink, MAX_LEVELS);
s->filter = ff_get_audio_buffer(outlink, s->nb_samples);
s->absmean = ff_get_audio_buffer(outlink, MAX_LEVELS);
s->new_absmean = ff_get_audio_buffer(outlink, MAX_LEVELS);
if (!s->stddev || !s->absmean || !s->filter ||
!s->new_stddev || !s->new_absmean)
return AVERROR(ENOMEM);
s->channels = outlink->ch_layout.nb_channels;
s->overlap_length = max_left_ext(s->wavelet_length, s->levels);
s->prev_length = s->overlap_length;
s->drop_samples = s->overlap_length;
s->padd_samples = s->overlap_length;
s->sn = 1;
s->cp = av_calloc(s->channels, sizeof(*s->cp));
if (!s->cp)
return AVERROR(ENOMEM);
for (int ch = 0; ch < s->channels; ch++) {
ChannelParams *cp = &s->cp[ch];
cp->output_coefs = av_calloc(s->levels + 1, sizeof(*cp->output_coefs));
cp->filter_coefs = av_calloc(s->levels + 1, sizeof(*cp->filter_coefs));
cp->output_length = av_calloc(s->levels + 1, sizeof(*cp->output_length));
cp->filter_length = av_calloc(s->levels + 1, sizeof(*cp->filter_length));
cp->buffer_length = next_pow2(s->wavelet_length);
cp->buffer = av_calloc(cp->buffer_length, sizeof(*cp->buffer));
cp->buffer2 = av_calloc(cp->buffer_length, sizeof(*cp->buffer2));
cp->subbands_to_free = av_calloc(s->levels + 1, sizeof(*cp->subbands_to_free));
cp->prev = av_calloc(s->prev_length, sizeof(*cp->prev));
cp->overlap = av_calloc(s->overlap_length, sizeof(*cp->overlap));
cp->max_left_ext = max_left_ext(s->wavelet_length, s->levels);
cp->min_left_ext = min_left_ext(s->wavelet_length, s->levels);
if (!cp->output_coefs || !cp->filter_coefs || !cp->output_length ||
!cp->filter_length || !cp->subbands_to_free || !cp->prev || !cp->overlap ||
!cp->buffer || !cp->buffer2)
return AVERROR(ENOMEM);
}
return 0;
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
AudioFWTDNContext *s = ctx->priv;
AVFrame *in = NULL;
int ret, status;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
if (!s->eof) {
ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
if (ret < 0)
return ret;
if (ret > 0)
return filter_frame(inlink, in);
}
if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
if (status == AVERROR_EOF)
s->eof = 1;
}
if (s->eof && s->padd_samples != 0) {
return filter_frame(inlink, NULL);
} else if (s->eof) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts);
return 0;
}
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
static av_cold void uninit(AVFilterContext *ctx)
{
AudioFWTDNContext *s = ctx->priv;
av_frame_free(&s->filter);
av_frame_free(&s->new_stddev);
av_frame_free(&s->stddev);
av_frame_free(&s->new_absmean);
av_frame_free(&s->absmean);
for (int ch = 0; s->cp && ch < s->channels; ch++) {
ChannelParams *cp = &s->cp[ch];
av_freep(&cp->tempa);
av_freep(&cp->tempd);
av_freep(&cp->temp_in);
av_freep(&cp->buffer);
av_freep(&cp->buffer2);
av_freep(&cp->prev);
av_freep(&cp->overlap);
av_freep(&cp->output_length);
av_freep(&cp->filter_length);
if (cp->output_coefs) {
for (int level = 0; level <= s->levels; level++)
av_freep(&cp->output_coefs[level]);
}
if (cp->subbands_to_free) {
for (int level = 0; level <= s->levels; level++)
av_freep(&cp->subbands_to_free[level]);
}
av_freep(&cp->subbands_to_free);
av_freep(&cp->output_coefs);
av_freep(&cp->filter_coefs);
}
av_freep(&s->cp);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
AudioFWTDNContext *s = ctx->priv;
int ret;
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
if (!strcmp(cmd, "profile") && s->need_profile)
s->got_profile = 0;
return 0;
}
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_output,
},
};
const AVFilter ff_af_afwtdn = {
.name = "afwtdn",
.description = NULL_IF_CONFIG_SMALL("Denoise audio stream using Wavelets."),
.priv_size = sizeof(AudioFWTDNContext),
.priv_class = &afwtdn_class,
.activate = activate,
.uninit = uninit,
FILTER_INPUTS(ff_audio_default_filterpad),
FILTER_OUTPUTS(outputs),
FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
.process_command = process_command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
AVFILTER_FLAG_SLICE_THREADS,
};
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