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 void (*filter_func)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
37 typedef struct Bs2bContext {
49 #define OFFSET(x) offsetof(Bs2bContext, x)
50 #define A AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
52 static const AVOption bs2b_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 },
65 AVFILTER_DEFINE_CLASS(bs2b);
67 static av_cold int init(AVFilterContext *ctx)
69 Bs2bContext *bs2b = ctx->priv;
71 if (!(bs2b->bs2bp = bs2b_open()))
72 return AVERROR(ENOMEM);
74 bs2b_set_level(bs2b->bs2bp, bs2b->profile);
77 bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
80 bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
85 static av_cold void uninit(AVFilterContext *ctx)
87 Bs2bContext *bs2b = ctx->priv;
90 bs2b_close(bs2b->bs2bp);
93 static int query_formats(AVFilterContext *ctx)
95 AVFilterFormats *formats = NULL;
96 AVFilterChannelLayouts *layouts = NULL;
98 static const enum AVSampleFormat sample_fmts[] = {
108 if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
109 return AVERROR(ENOMEM);
110 ret = ff_set_common_channel_layouts(ctx, layouts);
114 formats = ff_make_format_list(sample_fmts);
116 return AVERROR(ENOMEM);
117 ret = ff_set_common_formats(ctx, formats);
121 formats = ff_all_samplerates();
123 return AVERROR(ENOMEM);
124 return ff_set_common_samplerates(ctx, formats);
127 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
132 Bs2bContext *bs2b = inlink->dst->priv;
133 AVFilterLink *outlink = inlink->dst->outputs[0];
135 if (av_frame_is_writable(frame)) {
138 out_frame = ff_get_audio_buffer(outlink, frame->nb_samples);
140 av_frame_free(&frame);
141 return AVERROR(ENOMEM);
143 av_frame_copy(out_frame, frame);
144 ret = av_frame_copy_props(out_frame, frame);
146 av_frame_free(&out_frame);
147 av_frame_free(&frame);
152 bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
154 if (frame != out_frame)
155 av_frame_free(&frame);
157 return ff_filter_frame(outlink, out_frame);
160 static int config_output(AVFilterLink *outlink)
162 AVFilterContext *ctx = outlink->src;
163 Bs2bContext *bs2b = ctx->priv;
164 AVFilterLink *inlink = ctx->inputs[0];
166 int srate = inlink->sample_rate;
168 switch (inlink->format) {
169 case AV_SAMPLE_FMT_U8:
170 bs2b->filter = (filter_func) bs2b_cross_feed_u8;
172 case AV_SAMPLE_FMT_S16:
173 bs2b->filter = (filter_func) bs2b_cross_feed_s16;
175 case AV_SAMPLE_FMT_S32:
176 bs2b->filter = (filter_func) bs2b_cross_feed_s32;
178 case AV_SAMPLE_FMT_FLT:
179 bs2b->filter = (filter_func) bs2b_cross_feed_f;
181 case AV_SAMPLE_FMT_DBL:
182 bs2b->filter = (filter_func) bs2b_cross_feed_d;
188 if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
189 return AVERROR(ENOSYS);
191 bs2b_set_srate(bs2b->bs2bp, srate);
196 static const AVFilterPad bs2b_inputs[] = {
199 .type = AVMEDIA_TYPE_AUDIO,
200 .filter_frame = filter_frame,
205 static const AVFilterPad bs2b_outputs[] = {
208 .type = AVMEDIA_TYPE_AUDIO,
209 .config_props = config_output,
214 AVFilter ff_af_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,
222 .inputs = bs2b_inputs,
223 .outputs = bs2b_outputs,