1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
|
/*
* 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 "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "internal.h"
enum FilterType {
DC_TYPE,
AC_TYPE,
SQ_TYPE,
PS_TYPE,
NB_TYPES,
};
typedef struct ADenormContext {
const AVClass *class;
double level;
double level_db;
int type;
int64_t in_samples;
void (*filter[NB_TYPES])(AVFilterContext *ctx, void *dst,
const void *src, int nb_samples);
} ADenormContext;
static void dc_denorm_fltp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const float *src = (const float *)srcp;
float *dst = (float *)dstp;
const float dc = s->level;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc;
}
}
static void dc_denorm_dblp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const double *src = (const double *)srcp;
double *dst = (double *)dstp;
const double dc = s->level;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc;
}
}
static void ac_denorm_fltp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const float *src = (const float *)srcp;
float *dst = (float *)dstp;
const float dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * (((N + n) & 1) ? -1.f : 1.f);
}
}
static void ac_denorm_dblp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const double *src = (const double *)srcp;
double *dst = (double *)dstp;
const double dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * (((N + n) & 1) ? -1. : 1.);
}
}
static void sq_denorm_fltp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const float *src = (const float *)srcp;
float *dst = (float *)dstp;
const float dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * ((((N + n) >> 8) & 1) ? -1.f : 1.f);
}
}
static void sq_denorm_dblp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const double *src = (const double *)srcp;
double *dst = (double *)dstp;
const double dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * ((((N + n) >> 8) & 1) ? -1. : 1.);
}
}
static void ps_denorm_fltp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const float *src = (const float *)srcp;
float *dst = (float *)dstp;
const float dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * (((N + n) & 255) ? 0.f : 1.f);
}
}
static void ps_denorm_dblp(AVFilterContext *ctx, void *dstp,
const void *srcp, int nb_samples)
{
ADenormContext *s = ctx->priv;
const double *src = (const double *)srcp;
double *dst = (double *)dstp;
const double dc = s->level;
const int64_t N = s->in_samples;
for (int n = 0; n < nb_samples; n++) {
dst[n] = src[n] + dc * (((N + n) & 255) ? 0. : 1.);
}
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ADenormContext *s = ctx->priv;
switch (outlink->format) {
case AV_SAMPLE_FMT_FLTP:
s->filter[DC_TYPE] = dc_denorm_fltp;
s->filter[AC_TYPE] = ac_denorm_fltp;
s->filter[SQ_TYPE] = sq_denorm_fltp;
s->filter[PS_TYPE] = ps_denorm_fltp;
break;
case AV_SAMPLE_FMT_DBLP:
s->filter[DC_TYPE] = dc_denorm_dblp;
s->filter[AC_TYPE] = ac_denorm_dblp;
s->filter[SQ_TYPE] = sq_denorm_dblp;
s->filter[PS_TYPE] = ps_denorm_dblp;
break;
default:
av_assert0(0);
}
return 0;
}
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ADenormContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame *out = td->out;
AVFrame *in = td->in;
const int start = (in->ch_layout.nb_channels * jobnr) / nb_jobs;
const int end = (in->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
for (int ch = start; ch < end; ch++) {
s->filter[s->type](ctx, out->extended_data[ch],
in->extended_data[ch],
in->nb_samples);
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
ADenormContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
ThreadData td;
AVFrame *out;
if (av_frame_is_writable(in)) {
out = in;
} else {
out = ff_get_audio_buffer(outlink, in->nb_samples);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
}
s->level = exp(s->level_db / 20. * M_LN10);
td.in = in; td.out = out;
ff_filter_execute(ctx, filter_channels, &td, NULL,
FFMIN(inlink->ch_layout.nb_channels, ff_filter_get_nb_threads(ctx)));
s->in_samples += in->nb_samples;
if (out != in)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad adenorm_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad adenorm_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_output,
},
};
#define OFFSET(x) offsetof(ADenormContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption adenorm_options[] = {
{ "level", "set level", OFFSET(level_db), AV_OPT_TYPE_DOUBLE, {.dbl=-351}, -451, -90, FLAGS },
{ "type", "set type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=DC_TYPE}, 0, NB_TYPES-1, FLAGS, "type" },
{ "dc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=DC_TYPE}, 0, 0, FLAGS, "type"},
{ "ac", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AC_TYPE}, 0, 0, FLAGS, "type"},
{ "square",NULL, 0, AV_OPT_TYPE_CONST, {.i64=SQ_TYPE}, 0, 0, FLAGS, "type"},
{ "pulse", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PS_TYPE}, 0, 0, FLAGS, "type"},
{ NULL }
};
AVFILTER_DEFINE_CLASS(adenorm);
const AVFilter ff_af_adenorm = {
.name = "adenorm",
.description = NULL_IF_CONFIG_SMALL("Remedy denormals by adding extremely low-level noise."),
.priv_size = sizeof(ADenormContext),
FILTER_INPUTS(adenorm_inputs),
FILTER_OUTPUTS(adenorm_outputs),
FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP),
.priv_class = &adenorm_class,
.process_command = ff_filter_process_command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
AVFILTER_FLAG_SLICE_THREADS,
};
|
