FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/asrc_hilbert.c
Date: 2024-12-12 01:08:13
Exec Total Coverage
Lines: 0 50 0.0%
Functions: 0 5 0.0%
Branches: 0 18 0.0%

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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/channel_layout.h"
22 #include "libavutil/mem.h"
23 #include "libavutil/opt.h"
24 #include "audio.h"
25 #include "avfilter.h"
26 #include "formats.h"
27 #include "filters.h"
28 #include "window_func.h"
29
30 typedef struct HilbertContext {
31 const AVClass *class;
32
33 int sample_rate;
34 int nb_taps;
35 int nb_samples;
36 int win_func;
37
38 float *taps;
39 int64_t pts;
40 } HilbertContext;
41
42 #define OFFSET(x) offsetof(HilbertContext, x)
43 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
44
45 static const AVOption hilbert_options[] = {
46 { "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, FLAGS },
47 { "r", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, FLAGS },
48 { "taps", "set number of taps", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_MAX, FLAGS },
49 { "t", "set number of taps", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_MAX, FLAGS },
50 { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
51 { "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
52 WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_BLACKMAN),
53 WIN_FUNC_OPTION("w", OFFSET(win_func), FLAGS, WFUNC_BLACKMAN),
54 {NULL}
55 };
56
57 AVFILTER_DEFINE_CLASS(hilbert);
58
59 static av_cold int init(AVFilterContext *ctx)
60 {
61 HilbertContext *s = ctx->priv;
62
63 if (!(s->nb_taps & 1)) {
64 av_log(s, AV_LOG_ERROR, "Number of taps %d must be odd length.\n", s->nb_taps);
65 return AVERROR(EINVAL);
66 }
67
68 return 0;
69 }
70
71 static av_cold void uninit(AVFilterContext *ctx)
72 {
73 HilbertContext *s = ctx->priv;
74
75 av_freep(&s->taps);
76 }
77
78 static av_cold int query_formats(const AVFilterContext *ctx,
79 AVFilterFormatsConfig **cfg_in,
80 AVFilterFormatsConfig **cfg_out)
81 {
82 HilbertContext *s = ctx->priv;
83 static const AVChannelLayout chlayouts[] = { AV_CHANNEL_LAYOUT_MONO, { 0 } };
84 int sample_rates[] = { s->sample_rate, -1 };
85 static const enum AVSampleFormat sample_fmts[] = {
86 AV_SAMPLE_FMT_FLT,
87 AV_SAMPLE_FMT_NONE
88 };
89 int ret = ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, sample_fmts);
90 if (ret < 0)
91 return ret;
92
93 ret = ff_set_common_channel_layouts_from_list2(ctx, cfg_in, cfg_out, chlayouts);
94 if (ret < 0)
95 return ret;
96
97 return ff_set_common_samplerates_from_list2(ctx, cfg_in, cfg_out, sample_rates);
98 }
99
100 static av_cold int config_props(AVFilterLink *outlink)
101 {
102 AVFilterContext *ctx = outlink->src;
103 HilbertContext *s = ctx->priv;
104 float overlap;
105 int i;
106
107 s->taps = av_malloc_array(s->nb_taps, sizeof(*s->taps));
108 if (!s->taps)
109 return AVERROR(ENOMEM);
110
111 generate_window_func(s->taps, s->nb_taps, s->win_func, &overlap);
112
113 for (i = 0; i < s->nb_taps; i++) {
114 int k = -(s->nb_taps / 2) + i;
115
116 if (k & 1) {
117 float pk = M_PI * k;
118
119 s->taps[i] *= (1.f - cosf(pk)) / pk;
120 } else {
121 s->taps[i] = 0.f;
122 }
123 }
124
125 s->pts = 0;
126
127 return 0;
128 }
129
130 static int activate(AVFilterContext *ctx)
131 {
132 AVFilterLink *outlink = ctx->outputs[0];
133 HilbertContext *s = ctx->priv;
134 AVFrame *frame;
135 int nb_samples;
136
137 if (!ff_outlink_frame_wanted(outlink))
138 return FFERROR_NOT_READY;
139
140 nb_samples = FFMIN(s->nb_samples, s->nb_taps - s->pts);
141 if (nb_samples <= 0) {
142 ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
143 return 0;
144 }
145
146 if (!(frame = ff_get_audio_buffer(outlink, nb_samples)))
147 return AVERROR(ENOMEM);
148
149 memcpy(frame->data[0], s->taps + s->pts, nb_samples * sizeof(float));
150
151 frame->pts = s->pts;
152 s->pts += nb_samples;
153 return ff_filter_frame(outlink, frame);
154 }
155
156 static const AVFilterPad hilbert_outputs[] = {
157 {
158 .name = "default",
159 .type = AVMEDIA_TYPE_AUDIO,
160 .config_props = config_props,
161 },
162 };
163
164 const AVFilter ff_asrc_hilbert = {
165 .name = "hilbert",
166 .description = NULL_IF_CONFIG_SMALL("Generate a Hilbert transform FIR coefficients."),
167 .init = init,
168 .uninit = uninit,
169 .activate = activate,
170 .priv_size = sizeof(HilbertContext),
171 .inputs = NULL,
172 FILTER_OUTPUTS(hilbert_outputs),
173 FILTER_QUERY_FUNC2(query_formats),
174 .priv_class = &hilbert_class,
175 };
176