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
|
/*
* Copyright (c) 2018 Chris Johnson
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "audio.h"
#include "formats.h"
typedef struct DeesserChannel {
double s1, s2, s3;
double m1, m2;
double ratioA, ratioB;
double iirSampleA, iirSampleB;
int flip;
} DeesserChannel;
typedef struct DeesserContext {
const AVClass *class;
double intensity;
double max;
double frequency;
int mode;
DeesserChannel *chan;
} DeesserContext;
enum OutModes {
IN_MODE,
OUT_MODE,
ESS_MODE,
NB_MODES
};
#define OFFSET(x) offsetof(DeesserContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption deesser_options[] = {
{ "i", "set intensity", OFFSET(intensity), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, 0.0, 1.0, A },
{ "m", "set max deessing", OFFSET(max), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0.0, 1.0, A },
{ "f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0.0, 1.0, A },
{ "s", "set output mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=OUT_MODE}, 0, NB_MODES-1, A, "mode" },
{ "i", "input", 0, AV_OPT_TYPE_CONST, {.i64=IN_MODE}, 0, 0, A, "mode" },
{ "o", "output", 0, AV_OPT_TYPE_CONST, {.i64=OUT_MODE}, 0, 0, A, "mode" },
{ "e", "ess", 0, AV_OPT_TYPE_CONST, {.i64=ESS_MODE}, 0, 0, A, "mode" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(deesser);
static int query_formats(AVFilterContext *ctx)
{
static const enum AVSampleFormat sample_fmts[] = {
AV_SAMPLE_FMT_DBLP,
AV_SAMPLE_FMT_NONE
};
int ret = ff_set_common_formats_from_list(ctx, sample_fmts);
if (ret < 0)
return ret;
ret = ff_set_common_all_channel_counts(ctx);
if (ret < 0)
return ret;
return ff_set_common_all_samplerates(ctx);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
DeesserContext *s = ctx->priv;
s->chan = av_calloc(inlink->channels, sizeof(*s->chan));
if (!s->chan)
return AVERROR(ENOMEM);
for (int i = 0; i < inlink->channels; i++) {
DeesserChannel *chan = &s->chan[i];
chan->ratioA = chan->ratioB = 1.0;
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
DeesserContext *s = ctx->priv;
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);
}
for (int ch = 0; ch < inlink->channels; ch++) {
DeesserChannel *dec = &s->chan[ch];
double *src = (double *)in->extended_data[ch];
double *dst = (double *)out->extended_data[ch];
double overallscale = inlink->sample_rate < 44100 ? 44100.0 / inlink->sample_rate : inlink->sample_rate / 44100.0;
double intensity = pow(s->intensity, 5) * (8192 / overallscale);
double maxdess = 1.0 / pow(10.0, ((s->max - 1.0) * 48.0) / 20);
double iirAmount = pow(s->frequency, 2) / overallscale;
double offset;
double sense;
double recovery;
double attackspeed;
for (int i = 0; i < in->nb_samples; i++) {
double sample = src[i];
dec->s3 = dec->s2;
dec->s2 = dec->s1;
dec->s1 = sample;
dec->m1 = (dec->s1 - dec->s2) * ((dec->s1 - dec->s2) / 1.3);
dec->m2 = (dec->s2 - dec->s3) * ((dec->s1 - dec->s2) / 1.3);
sense = (dec->m1 - dec->m2) * ((dec->m1 - dec->m2) / 1.3);
attackspeed = 7.0 + sense * 1024;
sense = 1.0 + intensity * intensity * sense;
sense = FFMIN(sense, intensity);
recovery = 1.0 + (0.01 / sense);
offset = 1.0 - fabs(sample);
if (dec->flip) {
dec->iirSampleA = (dec->iirSampleA * (1.0 - (offset * iirAmount))) +
(sample * (offset * iirAmount));
if (dec->ratioA < sense) {
dec->ratioA = ((dec->ratioA * attackspeed) + sense) / (attackspeed + 1.0);
} else {
dec->ratioA = 1.0 + ((dec->ratioA - 1.0) / recovery);
}
dec->ratioA = FFMIN(dec->ratioA, maxdess);
sample = dec->iirSampleA + ((sample - dec->iirSampleA) / dec->ratioA);
} else {
dec->iirSampleB = (dec->iirSampleB * (1.0 - (offset * iirAmount))) +
(sample * (offset * iirAmount));
if (dec->ratioB < sense) {
dec->ratioB = ((dec->ratioB * attackspeed) + sense) / (attackspeed + 1.0);
} else {
dec->ratioB = 1.0 + ((dec->ratioB - 1.0) / recovery);
}
dec->ratioB = FFMIN(dec->ratioB, maxdess);
sample = dec->iirSampleB + ((sample - dec->iirSampleB) / dec->ratioB);
}
dec->flip = !dec->flip;
if (ctx->is_disabled)
sample = src[i];
switch (s->mode) {
case IN_MODE: dst[i] = src[i]; break;
case OUT_MODE: dst[i] = sample; break;
case ESS_MODE: dst[i] = src[i] - sample; break;
}
}
}
if (out != in)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
DeesserContext *s = ctx->priv;
av_freep(&s->chan);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
};
const AVFilter ff_af_deesser = {
.name = "deesser",
.description = NULL_IF_CONFIG_SMALL("Apply de-essing to the audio."),
.query_formats = query_formats,
.priv_size = sizeof(DeesserContext),
.priv_class = &deesser_class,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(outputs),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};
|
