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af_bs2b.c
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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 
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 
35 typedef 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 
50 static const AVOption 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 
63 static const AVClass bs2b_class = {
64  .class_name = "bs2b filter",
65  .item_name = av_default_item_name,
66  .option = options,
67  .version = LIBAVUTIL_VERSION_INT,
68 };
69 
70 static av_cold int init(AVFilterContext *ctx)
71 {
72  Bs2bContext *bs2b = ctx->priv;
73 
74  if (!(bs2b->bs2bp = bs2b_open()))
75  return AVERROR(ENOMEM);
76 
77  bs2b_set_level(bs2b->bs2bp, bs2b->profile);
78 
79  if (bs2b->fcut)
80  bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
81 
82  if (bs2b->feed)
83  bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
84 
85  return 0;
86 }
87 
88 static av_cold void uninit(AVFilterContext *ctx)
89 {
90  Bs2bContext *bs2b = ctx->priv;
91 
92  if (bs2b->bs2bp)
93  bs2b_close(bs2b->bs2bp);
94 }
95 
97 {
98  AVFilterFormats *formats = NULL;
100 
101  static const enum AVSampleFormat sample_fmts[] = {
108  };
109 
110  if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
111  return AVERROR(ENOMEM);
112  ff_set_common_channel_layouts(ctx, layouts);
113 
114  formats = ff_make_format_list(sample_fmts);
115  if (!formats)
116  return AVERROR(ENOMEM);
117  ff_set_common_formats(ctx, formats);
118 
119  formats = ff_all_samplerates();
120  if (!formats)
121  return AVERROR(ENOMEM);
122  ff_set_common_samplerates(ctx, formats);
123 
124  return 0;
125 }
126 
127 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
128 {
129  int ret;
130  AVFrame *out_frame;
131 
132  Bs2bContext *bs2b = inlink->dst->priv;
133  AVFilterLink *outlink = inlink->dst->outputs[0];
134 
135  if (av_frame_is_writable(frame)) {
136  out_frame = frame;
137  } else {
138  out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
139  if (!out_frame)
140  return AVERROR(ENOMEM);
141  av_frame_copy(out_frame, frame);
142  ret = av_frame_copy_props(out_frame, frame);
143  if (ret < 0) {
144  av_frame_free(&out_frame);
145  av_frame_free(&frame);
146  return ret;
147  }
148  }
149 
150  bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
151 
152  if (frame != out_frame)
153  av_frame_free(&frame);
154 
155  return ff_filter_frame(outlink, out_frame);
156 }
157 
158 static int config_output(AVFilterLink *outlink)
159 {
160  AVFilterContext *ctx = outlink->src;
161  Bs2bContext *bs2b = ctx->priv;
162  AVFilterLink *inlink = ctx->inputs[0];
163 
164  int srate = inlink->sample_rate;
165 
166  switch (inlink->format) {
167  case AV_SAMPLE_FMT_U8:
168  bs2b->filter = bs2b_cross_feed_u8;
169  break;
170  case AV_SAMPLE_FMT_S16:
171  bs2b->filter = (void*)bs2b_cross_feed_s16;
172  break;
173  case AV_SAMPLE_FMT_S32:
174  bs2b->filter = (void*)bs2b_cross_feed_s32;
175  break;
176  case AV_SAMPLE_FMT_FLT:
177  bs2b->filter = (void*)bs2b_cross_feed_f;
178  break;
179  case AV_SAMPLE_FMT_DBL:
180  bs2b->filter = (void*)bs2b_cross_feed_d;
181  break;
182  default:
183  return AVERROR_BUG;
184  }
185 
186  if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
187  return AVERROR(ENOSYS);
188 
189  bs2b_set_srate(bs2b->bs2bp, srate);
190 
191  return 0;
192 }
193 
194 static const AVFilterPad bs2b_inputs[] = {
195  {
196  .name = "default",
197  .type = AVMEDIA_TYPE_AUDIO,
198  .filter_frame = filter_frame,
199  },
200  { NULL }
201 };
202 
203 static const AVFilterPad bs2b_outputs[] = {
204  {
205  .name = "default",
206  .type = AVMEDIA_TYPE_AUDIO,
207  .config_props = config_output,
208  },
209  { NULL }
210 };
211 
213  .name = "bs2b",
214  .description = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
215  .query_formats = query_formats,
216  .priv_size = sizeof(Bs2bContext),
217  .priv_class = &bs2b_class,
218  .init = init,
219  .uninit = uninit,
220  .inputs = bs2b_inputs,
221  .outputs = bs2b_outputs,
222 };