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path: root/libavfilter/af_bs2b.c (plain)
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1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/**
20 * @file
21 * Bauer stereo-to-binaural filter
22 */
23
24#include <bs2b.h>
25
26#include "libavutil/channel_layout.h"
27#include "libavutil/common.h"
28#include "libavutil/opt.h"
29
30#include "audio.h"
31#include "avfilter.h"
32#include "formats.h"
33#include "internal.h"
34
35typedef struct Bs2bContext {
36 const AVClass *class;
37
38 int profile;
39 int fcut;
40 int feed;
41
42 t_bs2bdp bs2bp;
43
44 void (*filter)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
45} Bs2bContext;
46
47#define OFFSET(x) offsetof(Bs2bContext, x)
48#define A AV_OPT_FLAG_AUDIO_PARAM
49
50static const AVOption bs2b_options[] = {
51 { "profile", "Apply a pre-defined crossfeed level",
52 OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, INT_MAX, A, "profile" },
53 { "default", "default profile", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, 0, A, "profile" },
54 { "cmoy", "Chu Moy circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_CMOY_CLEVEL }, 0, 0, A, "profile" },
55 { "jmeier", "Jan Meier circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_JMEIER_CLEVEL }, 0, 0, A, "profile" },
56 { "fcut", "Set cut frequency (in Hz)",
57 OFFSET(fcut), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFCUT, A },
58 { "feed", "Set feed level (in Hz)",
59 OFFSET(feed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFEED, A },
60 { NULL },
61};
62
63AVFILTER_DEFINE_CLASS(bs2b);
64
65static av_cold int init(AVFilterContext *ctx)
66{
67 Bs2bContext *bs2b = ctx->priv;
68
69 if (!(bs2b->bs2bp = bs2b_open()))
70 return AVERROR(ENOMEM);
71
72 bs2b_set_level(bs2b->bs2bp, bs2b->profile);
73
74 if (bs2b->fcut)
75 bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
76
77 if (bs2b->feed)
78 bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
79
80 return 0;
81}
82
83static av_cold void uninit(AVFilterContext *ctx)
84{
85 Bs2bContext *bs2b = ctx->priv;
86
87 if (bs2b->bs2bp)
88 bs2b_close(bs2b->bs2bp);
89}
90
91static int query_formats(AVFilterContext *ctx)
92{
93 AVFilterFormats *formats = NULL;
94 AVFilterChannelLayouts *layouts = NULL;
95
96 static const enum AVSampleFormat sample_fmts[] = {
97 AV_SAMPLE_FMT_U8,
98 AV_SAMPLE_FMT_S16,
99 AV_SAMPLE_FMT_S32,
100 AV_SAMPLE_FMT_FLT,
101 AV_SAMPLE_FMT_DBL,
102 AV_SAMPLE_FMT_NONE,
103 };
104 int ret;
105
106 if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
107 return AVERROR(ENOMEM);
108 ret = ff_set_common_channel_layouts(ctx, layouts);
109 if (ret < 0)
110 return ret;
111
112 formats = ff_make_format_list(sample_fmts);
113 if (!formats)
114 return AVERROR(ENOMEM);
115 ret = ff_set_common_formats(ctx, formats);
116 if (ret < 0)
117 return ret;
118
119 formats = ff_all_samplerates();
120 if (!formats)
121 return AVERROR(ENOMEM);
122 return ff_set_common_samplerates(ctx, formats);
123}
124
125static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
126{
127 int ret;
128 AVFrame *out_frame;
129
130 Bs2bContext *bs2b = inlink->dst->priv;
131 AVFilterLink *outlink = inlink->dst->outputs[0];
132
133 if (av_frame_is_writable(frame)) {
134 out_frame = frame;
135 } else {
136 out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
137 if (!out_frame)
138 return AVERROR(ENOMEM);
139 av_frame_copy(out_frame, frame);
140 ret = av_frame_copy_props(out_frame, frame);
141 if (ret < 0) {
142 av_frame_free(&out_frame);
143 av_frame_free(&frame);
144 return ret;
145 }
146 }
147
148 bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
149
150 if (frame != out_frame)
151 av_frame_free(&frame);
152
153 return ff_filter_frame(outlink, out_frame);
154}
155
156static int config_output(AVFilterLink *outlink)
157{
158 AVFilterContext *ctx = outlink->src;
159 Bs2bContext *bs2b = ctx->priv;
160 AVFilterLink *inlink = ctx->inputs[0];
161
162 int srate = inlink->sample_rate;
163
164 switch (inlink->format) {
165 case AV_SAMPLE_FMT_U8:
166 bs2b->filter = bs2b_cross_feed_u8;
167 break;
168 case AV_SAMPLE_FMT_S16:
169 bs2b->filter = (void*)bs2b_cross_feed_s16;
170 break;
171 case AV_SAMPLE_FMT_S32:
172 bs2b->filter = (void*)bs2b_cross_feed_s32;
173 break;
174 case AV_SAMPLE_FMT_FLT:
175 bs2b->filter = (void*)bs2b_cross_feed_f;
176 break;
177 case AV_SAMPLE_FMT_DBL:
178 bs2b->filter = (void*)bs2b_cross_feed_d;
179 break;
180 default:
181 return AVERROR_BUG;
182 }
183
184 if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
185 return AVERROR(ENOSYS);
186
187 bs2b_set_srate(bs2b->bs2bp, srate);
188
189 return 0;
190}
191
192static const AVFilterPad bs2b_inputs[] = {
193 {
194 .name = "default",
195 .type = AVMEDIA_TYPE_AUDIO,
196 .filter_frame = filter_frame,
197 },
198 { NULL }
199};
200
201static const AVFilterPad bs2b_outputs[] = {
202 {
203 .name = "default",
204 .type = AVMEDIA_TYPE_AUDIO,
205 .config_props = config_output,
206 },
207 { NULL }
208};
209
210AVFilter ff_af_bs2b = {
211 .name = "bs2b",
212 .description = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
213 .query_formats = query_formats,
214 .priv_size = sizeof(Bs2bContext),
215 .priv_class = &bs2b_class,
216 .init = init,
217 .uninit = uninit,
218 .inputs = bs2b_inputs,
219 .outputs = bs2b_outputs,
220};
221
generated by cgit at 2024-05-18 04:42:39 (GMT)