h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / af_bs2b.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav 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 * Libav 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 Libav; 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
35 typedef void (*filter_func)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
36
37 typedef struct Bs2bContext {
38 const AVClass *class;
39
40 int profile;
41 int fcut;
42 int feed;
43
44 t_bs2bdp bs2bp;
45
46 filter_func filter;
47 } Bs2bContext;
48
49 #define OFFSET(x) offsetof(Bs2bContext, x)
50 #define A AV_OPT_FLAG_AUDIO_PARAM
51
52 static const AVOption options[] = {
53 { "profile", "Apply a pre-defined crossfeed level",
54 OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, INT_MAX, A, "profile" },
55 { "default", "default profile", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, 0, A, "profile" },
56 { "cmoy", "Chu Moy circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_CMOY_CLEVEL }, 0, 0, A, "profile" },
57 { "jmeier", "Jan Meier circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_JMEIER_CLEVEL }, 0, 0, A, "profile" },
58 { "fcut", "Set cut frequency (in Hz)",
59 OFFSET(fcut), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFCUT, A },
60 { "feed", "Set feed level (in Hz)",
61 OFFSET(feed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFEED, A },
62 { NULL },
63 };
64
65 static const AVClass bs2b_class = {
66 .class_name = "bs2b filter",
67 .item_name = av_default_item_name,
68 .option = options,
69 .version = LIBAVUTIL_VERSION_INT,
70 };
71
72 static av_cold int init(AVFilterContext *ctx)
73 {
74 Bs2bContext *bs2b = ctx->priv;
75
76 if (!(bs2b->bs2bp = bs2b_open()))
77 return AVERROR(ENOMEM);
78
79 bs2b_set_level(bs2b->bs2bp, bs2b->profile);
80
81 if (bs2b->fcut)
82 bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
83
84 if (bs2b->feed)
85 bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
86
87 return 0;
88 }
89
90 static av_cold void uninit(AVFilterContext *ctx)
91 {
92 Bs2bContext *bs2b = ctx->priv;
93
94 if (bs2b->bs2bp)
95 bs2b_close(bs2b->bs2bp);
96 }
97
98 static int query_formats(AVFilterContext *ctx)
99 {
100 AVFilterFormats *formats = NULL;
101 AVFilterChannelLayouts *layouts = NULL;
102
103 static const enum AVSampleFormat sample_fmts[] = {
104 AV_SAMPLE_FMT_U8,
105 AV_SAMPLE_FMT_S16,
106 AV_SAMPLE_FMT_S32,
107 AV_SAMPLE_FMT_FLT,
108 AV_SAMPLE_FMT_DBL,
109 AV_SAMPLE_FMT_NONE,
110 };
111
112 if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
113 return AVERROR(ENOMEM);
114 ff_set_common_channel_layouts(ctx, layouts);
115
116 formats = ff_make_format_list(sample_fmts);
117 if (!formats)
118 return AVERROR(ENOMEM);
119 ff_set_common_formats(ctx, formats);
120
121 formats = ff_all_samplerates();
122 if (!formats)
123 return AVERROR(ENOMEM);
124 ff_set_common_samplerates(ctx, formats);
125
126 return 0;
127 }
128
129 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
130 {
131 int ret;
132 AVFrame *out_frame;
133
134 Bs2bContext *bs2b = inlink->dst->priv;
135 AVFilterLink *outlink = inlink->dst->outputs[0];
136
137 if (av_frame_is_writable(frame)) {
138 out_frame = frame;
139 } else {
140 out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
141 if (!out_frame)
142 return AVERROR(ENOMEM);
143 av_frame_copy(out_frame, frame);
144 ret = av_frame_copy_props(out_frame, frame);
145 if (ret < 0) {
146 av_frame_free(&out_frame);
147 av_frame_free(&frame);
148 return ret;
149 }
150 }
151
152 bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
153
154 if (frame != out_frame)
155 av_frame_free(&frame);
156
157 return ff_filter_frame(outlink, out_frame);
158 }
159
160 static int config_output(AVFilterLink *outlink)
161 {
162 AVFilterContext *ctx = outlink->src;
163 Bs2bContext *bs2b = ctx->priv;
164 AVFilterLink *inlink = ctx->inputs[0];
165
166 int srate = inlink->sample_rate;
167
168 switch (inlink->format) {
169 case AV_SAMPLE_FMT_U8:
170 bs2b->filter = (filter_func) bs2b_cross_feed_u8;
171 break;
172 case AV_SAMPLE_FMT_S16:
173 bs2b->filter = (filter_func) bs2b_cross_feed_s16;
174 break;
175 case AV_SAMPLE_FMT_S32:
176 bs2b->filter = (filter_func) bs2b_cross_feed_s32;
177 break;
178 case AV_SAMPLE_FMT_FLT:
179 bs2b->filter = (filter_func) bs2b_cross_feed_f;
180 break;
181 case AV_SAMPLE_FMT_DBL:
182 bs2b->filter = (filter_func) bs2b_cross_feed_d;
183 break;
184 default:
185 return AVERROR_BUG;
186 }
187
188 if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
189 return AVERROR(ENOSYS);
190
191 bs2b_set_srate(bs2b->bs2bp, srate);
192
193 return 0;
194 }
195
196 static const AVFilterPad bs2b_inputs[] = {
197 {
198 .name = "default",
199 .type = AVMEDIA_TYPE_AUDIO,
200 .filter_frame = filter_frame,
201 },
202 { NULL }
203 };
204
205 static const AVFilterPad bs2b_outputs[] = {
206 {
207 .name = "default",
208 .type = AVMEDIA_TYPE_AUDIO,
209 .config_props = config_output,
210 },
211 { NULL }
212 };
213
214 AVFilter ff_af_bs2b = {
215 .name = "bs2b",
216 .description = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
217 .query_formats = query_formats,
218 .priv_size = sizeof(Bs2bContext),
219 .priv_class = &bs2b_class,
220 .init = init,
221 .uninit = uninit,
222 .inputs = bs2b_inputs,
223 .outputs = bs2b_outputs,
224 };