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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 | ||
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 | ||
96 | static int query_formats(AVFilterContext *ctx) | |
97 | { | |
98 | AVFilterFormats *formats = NULL; | |
99 | AVFilterChannelLayouts *layouts = NULL; | |
100 | ||
101 | static const enum AVSampleFormat sample_fmts[] = { | |
102 | AV_SAMPLE_FMT_U8, | |
103 | AV_SAMPLE_FMT_S16, | |
104 | AV_SAMPLE_FMT_S32, | |
105 | AV_SAMPLE_FMT_FLT, | |
106 | AV_SAMPLE_FMT_DBL, | |
107 | AV_SAMPLE_FMT_NONE, | |
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 | ||
212 | AVFilter ff_af_bs2b = { | |
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 | }; |