2 * This file is part of FFmpeg.
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.
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.
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
21 * Bauer stereo-to-binaural filter
26 #include "libavutil/channel_layout.h"
27 #include "libavutil/common.h"
28 #include "libavutil/opt.h"
35 typedef struct Bs2bContext {
44 void (*filter)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
47 #define OFFSET(x) offsetof(Bs2bContext, x)
48 #define A AV_OPT_FLAG_AUDIO_PARAM
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 },
63 static const AVClass bs2b_class = {
64 .class_name = "bs2b filter",
65 .item_name = av_default_item_name,
67 .version = LIBAVUTIL_VERSION_INT,
70 static av_cold int init(AVFilterContext *ctx)
72 Bs2bContext *bs2b = ctx->priv;
74 if (!(bs2b->bs2bp = bs2b_open()))
75 return AVERROR(ENOMEM);
77 bs2b_set_level(bs2b->bs2bp, bs2b->profile);
80 bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
83 bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
88 static av_cold void uninit(AVFilterContext *ctx)
90 Bs2bContext *bs2b = ctx->priv;
93 bs2b_close(bs2b->bs2bp);
96 static int query_formats(AVFilterContext *ctx)
98 AVFilterFormats *formats = NULL;
99 AVFilterChannelLayouts *layouts = NULL;
101 static const enum AVSampleFormat sample_fmts[] = {
111 if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
112 return AVERROR(ENOMEM);
113 ret = ff_set_common_channel_layouts(ctx, layouts);
117 formats = ff_make_format_list(sample_fmts);
119 return AVERROR(ENOMEM);
120 ret = ff_set_common_formats(ctx, formats);
124 formats = ff_all_samplerates();
126 return AVERROR(ENOMEM);
127 return ff_set_common_samplerates(ctx, formats);
130 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
135 Bs2bContext *bs2b = inlink->dst->priv;
136 AVFilterLink *outlink = inlink->dst->outputs[0];
138 if (av_frame_is_writable(frame)) {
141 out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
143 return AVERROR(ENOMEM);
144 av_frame_copy(out_frame, frame);
145 ret = av_frame_copy_props(out_frame, frame);
147 av_frame_free(&out_frame);
148 av_frame_free(&frame);
153 bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
155 if (frame != out_frame)
156 av_frame_free(&frame);
158 return ff_filter_frame(outlink, out_frame);
161 static int config_output(AVFilterLink *outlink)
163 AVFilterContext *ctx = outlink->src;
164 Bs2bContext *bs2b = ctx->priv;
165 AVFilterLink *inlink = ctx->inputs[0];
167 int srate = inlink->sample_rate;
169 switch (inlink->format) {
170 case AV_SAMPLE_FMT_U8:
171 bs2b->filter = bs2b_cross_feed_u8;
173 case AV_SAMPLE_FMT_S16:
174 bs2b->filter = (void*)bs2b_cross_feed_s16;
176 case AV_SAMPLE_FMT_S32:
177 bs2b->filter = (void*)bs2b_cross_feed_s32;
179 case AV_SAMPLE_FMT_FLT:
180 bs2b->filter = (void*)bs2b_cross_feed_f;
182 case AV_SAMPLE_FMT_DBL:
183 bs2b->filter = (void*)bs2b_cross_feed_d;
189 if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
190 return AVERROR(ENOSYS);
192 bs2b_set_srate(bs2b->bs2bp, srate);
197 static const AVFilterPad bs2b_inputs[] = {
200 .type = AVMEDIA_TYPE_AUDIO,
201 .filter_frame = filter_frame,
206 static const AVFilterPad bs2b_outputs[] = {
209 .type = AVMEDIA_TYPE_AUDIO,
210 .config_props = config_output,
215 AVFilter ff_af_bs2b = {
217 .description = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
218 .query_formats = query_formats,
219 .priv_size = sizeof(Bs2bContext),
220 .priv_class = &bs2b_class,
223 .inputs = bs2b_inputs,
224 .outputs = bs2b_outputs,