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
|
/*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Bauer stereo-to-binaural filter
*/
#include <bs2b.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
typedef struct Bs2bContext {
const AVClass *class;
int profile;
int fcut;
int feed;
t_bs2bdp bs2bp;
void (*filter)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
} Bs2bContext;
#define OFFSET(x) offsetof(Bs2bContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
static const AVOption options[] = {
{ "profile", "Apply a pre-defined crossfeed level",
OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, INT_MAX, A, "profile" },
{ "default", "default profile", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, 0, A, "profile" },
{ "cmoy", "Chu Moy circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_CMOY_CLEVEL }, 0, 0, A, "profile" },
{ "jmeier", "Jan Meier circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_JMEIER_CLEVEL }, 0, 0, A, "profile" },
{ "fcut", "Set cut frequency (in Hz)",
OFFSET(fcut), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFCUT, A },
{ "feed", "Set feed level (in Hz)",
OFFSET(feed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFEED, A },
{ NULL },
};
static const AVClass bs2b_class = {
.class_name = "bs2b filter",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static av_cold int init(AVFilterContext *ctx)
{
Bs2bContext *bs2b = ctx->priv;
if (!(bs2b->bs2bp = bs2b_open()))
return AVERROR(ENOMEM);
bs2b_set_level(bs2b->bs2bp, bs2b->profile);
if (bs2b->fcut)
bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
if (bs2b->feed)
bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
Bs2bContext *bs2b = ctx->priv;
if (bs2b->bs2bp)
bs2b_close(bs2b->bs2bp);
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats = NULL;
AVFilterChannelLayouts *layouts = NULL;
static const enum AVSampleFormat sample_fmts[] = {
AV_SAMPLE_FMT_U8,
AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_S32,
AV_SAMPLE_FMT_FLT,
AV_SAMPLE_FMT_DBL,
AV_SAMPLE_FMT_NONE,
};
if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
return AVERROR(ENOMEM);
ff_set_common_channel_layouts(ctx, layouts);
formats = ff_make_format_list(sample_fmts);
if (!formats)
return AVERROR(ENOMEM);
ff_set_common_formats(ctx, formats);
formats = ff_all_samplerates();
if (!formats)
return AVERROR(ENOMEM);
ff_set_common_samplerates(ctx, formats);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
int ret;
AVFrame *out_frame;
Bs2bContext *bs2b = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
if (av_frame_is_writable(frame)) {
out_frame = frame;
} else {
out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
if (!out_frame)
return AVERROR(ENOMEM);
av_frame_copy(out_frame, frame);
ret = av_frame_copy_props(out_frame, frame);
if (ret < 0) {
av_frame_free(&out_frame);
av_frame_free(&frame);
return ret;
}
}
bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
if (frame != out_frame)
av_frame_free(&frame);
return ff_filter_frame(outlink, out_frame);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
Bs2bContext *bs2b = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
int srate = inlink->sample_rate;
switch (inlink->format) {
case AV_SAMPLE_FMT_U8:
bs2b->filter = bs2b_cross_feed_u8;
break;
case AV_SAMPLE_FMT_S16:
bs2b->filter = bs2b_cross_feed_s16;
break;
case AV_SAMPLE_FMT_S32:
bs2b->filter = bs2b_cross_feed_s32;
break;
case AV_SAMPLE_FMT_FLT:
bs2b->filter = bs2b_cross_feed_f;
break;
case AV_SAMPLE_FMT_DBL:
bs2b->filter = bs2b_cross_feed_d;
break;
default:
return AVERROR_BUG;
}
if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
return AVERROR(ENOSYS);
bs2b_set_srate(bs2b->bs2bp, srate);
return 0;
}
static const AVFilterPad bs2b_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad bs2b_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_af_bs2b = {
.name = "bs2b",
.description = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
.query_formats = query_formats,
.priv_size = sizeof(Bs2bContext),
.priv_class = &bs2b_class,
.init = init,
.uninit = uninit,
.inputs = bs2b_inputs,
.outputs = bs2b_outputs,
};
|
