1 |
|
|
/* |
2 |
|
|
* Copyright (c) 2018 Paul B Mahol |
3 |
|
|
* |
4 |
|
|
* This file is part of FFmpeg. |
5 |
|
|
* |
6 |
|
|
* FFmpeg is free software; you can redistribute it and/or |
7 |
|
|
* modify it under the terms of the GNU Lesser General Public License |
8 |
|
|
* as published by the Free Software Foundation; either |
9 |
|
|
* version 2.1 of the License, or (at your option) any later version. |
10 |
|
|
* |
11 |
|
|
* FFmpeg is distributed in the hope that it will be useful, |
12 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 |
|
|
* GNU Lesser General Public License for more details. |
15 |
|
|
* |
16 |
|
|
* You should have received a copy of the GNU Lesser General Public License |
17 |
|
|
* along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
18 |
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 |
|
|
*/ |
20 |
|
|
|
21 |
|
|
#include "libavutil/opt.h" |
22 |
|
|
#include "audio.h" |
23 |
|
|
#include "avfilter.h" |
24 |
|
|
#include "internal.h" |
25 |
|
|
#include "window_func.h" |
26 |
|
|
|
27 |
|
|
typedef struct HilbertContext { |
28 |
|
|
const AVClass *class; |
29 |
|
|
|
30 |
|
|
int sample_rate; |
31 |
|
|
int nb_taps; |
32 |
|
|
int nb_samples; |
33 |
|
|
int win_func; |
34 |
|
|
|
35 |
|
|
float *taps; |
36 |
|
|
int64_t pts; |
37 |
|
|
} HilbertContext; |
38 |
|
|
|
39 |
|
|
#define OFFSET(x) offsetof(HilbertContext, x) |
40 |
|
|
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
41 |
|
|
|
42 |
|
|
static const AVOption hilbert_options[] = { |
43 |
|
|
{ "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, FLAGS }, |
44 |
|
|
{ "r", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, FLAGS }, |
45 |
|
|
{ "taps", "set number of taps", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_MAX, FLAGS }, |
46 |
|
|
{ "t", "set number of taps", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_MAX, FLAGS }, |
47 |
|
|
{ "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS }, |
48 |
|
|
{ "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS }, |
49 |
|
|
{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64=WFUNC_BLACKMAN}, 0, NB_WFUNC-1, FLAGS, "win_func" }, |
50 |
|
|
{ "w", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64=WFUNC_BLACKMAN}, 0, NB_WFUNC-1, FLAGS, "win_func" }, |
51 |
|
|
{ "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" }, |
52 |
|
|
{ "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" }, |
53 |
|
|
{ "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" }, |
54 |
|
|
{ "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" }, |
55 |
|
|
{ "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" }, |
56 |
|
|
{ "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" }, |
57 |
|
|
{ "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" }, |
58 |
|
|
{ "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" }, |
59 |
|
|
{ "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" }, |
60 |
|
|
{ "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" }, |
61 |
|
|
{ "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" }, |
62 |
|
|
{ "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" }, |
63 |
|
|
{ "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" }, |
64 |
|
|
{ "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" }, |
65 |
|
|
{ "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" }, |
66 |
|
|
{ "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" }, |
67 |
|
|
{ "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, FLAGS, "win_func" }, |
68 |
|
|
{ "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, FLAGS, "win_func" }, |
69 |
|
|
{ "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, FLAGS, "win_func" }, |
70 |
|
|
{ "bohman" , "Bohman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN}, 0, 0, FLAGS, "win_func" }, |
71 |
|
|
{NULL} |
72 |
|
|
}; |
73 |
|
|
|
74 |
|
|
AVFILTER_DEFINE_CLASS(hilbert); |
75 |
|
|
|
76 |
|
|
static av_cold int init(AVFilterContext *ctx) |
77 |
|
|
{ |
78 |
|
|
HilbertContext *s = ctx->priv; |
79 |
|
|
|
80 |
|
|
if (!(s->nb_taps & 1)) { |
81 |
|
|
av_log(s, AV_LOG_ERROR, "Number of taps %d must be odd length.\n", s->nb_taps); |
82 |
|
|
return AVERROR(EINVAL); |
83 |
|
|
} |
84 |
|
|
|
85 |
|
|
return 0; |
86 |
|
|
} |
87 |
|
|
|
88 |
|
|
static av_cold void uninit(AVFilterContext *ctx) |
89 |
|
|
{ |
90 |
|
|
HilbertContext *s = ctx->priv; |
91 |
|
|
|
92 |
|
|
av_freep(&s->taps); |
93 |
|
|
} |
94 |
|
|
|
95 |
|
|
static av_cold int query_formats(AVFilterContext *ctx) |
96 |
|
|
{ |
97 |
|
|
HilbertContext *s = ctx->priv; |
98 |
|
|
static const int64_t chlayouts[] = { AV_CH_LAYOUT_MONO, -1 }; |
99 |
|
|
int sample_rates[] = { s->sample_rate, -1 }; |
100 |
|
|
static const enum AVSampleFormat sample_fmts[] = { |
101 |
|
|
AV_SAMPLE_FMT_FLT, |
102 |
|
|
AV_SAMPLE_FMT_NONE |
103 |
|
|
}; |
104 |
|
|
|
105 |
|
|
AVFilterFormats *formats; |
106 |
|
|
AVFilterChannelLayouts *layouts; |
107 |
|
|
int ret; |
108 |
|
|
|
109 |
|
|
formats = ff_make_format_list(sample_fmts); |
110 |
|
|
if (!formats) |
111 |
|
|
return AVERROR(ENOMEM); |
112 |
|
|
ret = ff_set_common_formats (ctx, formats); |
113 |
|
|
if (ret < 0) |
114 |
|
|
return ret; |
115 |
|
|
|
116 |
|
|
layouts = ff_make_format64_list(chlayouts); |
117 |
|
|
if (!layouts) |
118 |
|
|
return AVERROR(ENOMEM); |
119 |
|
|
ret = ff_set_common_channel_layouts(ctx, layouts); |
120 |
|
|
if (ret < 0) |
121 |
|
|
return ret; |
122 |
|
|
|
123 |
|
|
formats = ff_make_format_list(sample_rates); |
124 |
|
|
if (!formats) |
125 |
|
|
return AVERROR(ENOMEM); |
126 |
|
|
return ff_set_common_samplerates(ctx, formats); |
127 |
|
|
} |
128 |
|
|
|
129 |
|
|
static av_cold int config_props(AVFilterLink *outlink) |
130 |
|
|
{ |
131 |
|
|
AVFilterContext *ctx = outlink->src; |
132 |
|
|
HilbertContext *s = ctx->priv; |
133 |
|
|
float overlap; |
134 |
|
|
int i; |
135 |
|
|
|
136 |
|
|
s->taps = av_malloc_array(s->nb_taps, sizeof(*s->taps)); |
137 |
|
|
if (!s->taps) |
138 |
|
|
return AVERROR(ENOMEM); |
139 |
|
|
|
140 |
|
|
generate_window_func(s->taps, s->nb_taps, s->win_func, &overlap); |
141 |
|
|
|
142 |
|
|
for (i = 0; i < s->nb_taps; i++) { |
143 |
|
|
int k = -(s->nb_taps / 2) + i; |
144 |
|
|
|
145 |
|
|
if (k & 1) { |
146 |
|
|
float pk = M_PI * k; |
147 |
|
|
|
148 |
|
|
s->taps[i] *= (1.f - cosf(pk)) / pk; |
149 |
|
|
} else { |
150 |
|
|
s->taps[i] = 0.f; |
151 |
|
|
} |
152 |
|
|
} |
153 |
|
|
|
154 |
|
|
s->pts = 0; |
155 |
|
|
|
156 |
|
|
return 0; |
157 |
|
|
} |
158 |
|
|
|
159 |
|
|
static int request_frame(AVFilterLink *outlink) |
160 |
|
|
{ |
161 |
|
|
AVFilterContext *ctx = outlink->src; |
162 |
|
|
HilbertContext *s = ctx->priv; |
163 |
|
|
AVFrame *frame; |
164 |
|
|
int nb_samples; |
165 |
|
|
|
166 |
|
|
nb_samples = FFMIN(s->nb_samples, s->nb_taps - s->pts); |
167 |
|
|
if (!nb_samples) |
168 |
|
|
return AVERROR_EOF; |
169 |
|
|
|
170 |
|
|
if (!(frame = ff_get_audio_buffer(outlink, nb_samples))) |
171 |
|
|
return AVERROR(ENOMEM); |
172 |
|
|
|
173 |
|
|
memcpy(frame->data[0], s->taps + s->pts, nb_samples * sizeof(float)); |
174 |
|
|
|
175 |
|
|
frame->pts = s->pts; |
176 |
|
|
s->pts += nb_samples; |
177 |
|
|
return ff_filter_frame(outlink, frame); |
178 |
|
|
} |
179 |
|
|
|
180 |
|
|
static const AVFilterPad hilbert_outputs[] = { |
181 |
|
|
{ |
182 |
|
|
.name = "default", |
183 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
184 |
|
|
.request_frame = request_frame, |
185 |
|
|
.config_props = config_props, |
186 |
|
|
}, |
187 |
|
|
{ NULL } |
188 |
|
|
}; |
189 |
|
|
|
190 |
|
|
AVFilter ff_asrc_hilbert = { |
191 |
|
|
.name = "hilbert", |
192 |
|
|
.description = NULL_IF_CONFIG_SMALL("Generate a Hilbert transform FIR coefficients."), |
193 |
|
|
.query_formats = query_formats, |
194 |
|
|
.init = init, |
195 |
|
|
.uninit = uninit, |
196 |
|
|
.priv_size = sizeof(HilbertContext), |
197 |
|
|
.inputs = NULL, |
198 |
|
|
.outputs = hilbert_outputs, |
199 |
|
|
.priv_class = &hilbert_class, |
200 |
|
|
}; |