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+/*
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+ * This file is part of Libav.
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+ *
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+ * Libav is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU Lesser General Public
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+ * License as published by the Free Software Foundation; either
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+ * version 2.1 of the License, or (at your option) any later version.
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+ *
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+ * Libav is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * Lesser General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Lesser General Public
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+ * License along with Libav; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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+ */
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+
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+/**
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+ * @file
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+ * Bauer stereo-to-binaural filter
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+ */
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+
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+#include <bs2b.h>
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+
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+#include "libavutil/channel_layout.h"
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+#include "libavutil/common.h"
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+#include "libavutil/opt.h"
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+
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+#include "audio.h"
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+#include "avfilter.h"
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+#include "formats.h"
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+#include "internal.h"
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+
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+typedef struct Bs2bContext {
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+ const AVClass *class;
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+
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+ int profile;
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+ int fcut;
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+ int feed;
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+
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+ t_bs2bdp bs2bp;
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+
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+ void (*filter)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
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+} Bs2bContext;
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+
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+#define OFFSET(x) offsetof(Bs2bContext, x)
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+#define A AV_OPT_FLAG_AUDIO_PARAM
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+
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+static const AVOption options[] = {
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+ { "profile", "Apply a pre-defined crossfeed level",
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+ OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, INT_MAX, A, "profile" },
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+ { "default", "default profile", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, 0, A, "profile" },
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+ { "cmoy", "Chu Moy circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_CMOY_CLEVEL }, 0, 0, A, "profile" },
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+ { "jmeier", "Jan Meier circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_JMEIER_CLEVEL }, 0, 0, A, "profile" },
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+ { "fcut", "Set cut frequency (in Hz)",
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+ OFFSET(fcut), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFCUT, A },
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+ { "feed", "Set feed level (in Hz)",
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+ OFFSET(feed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFEED, A },
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+ { NULL },
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+};
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+
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+static const AVClass bs2b_class = {
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+ .class_name = "bs2b filter",
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+ .item_name = av_default_item_name,
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+ .option = options,
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+ .version = LIBAVUTIL_VERSION_INT,
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+};
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+
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+static av_cold int init(AVFilterContext *ctx)
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+{
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+ Bs2bContext *bs2b = ctx->priv;
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+
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+ if (!(bs2b->bs2bp = bs2b_open()))
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+ return AVERROR(ENOMEM);
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+
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+ bs2b_set_level(bs2b->bs2bp, bs2b->profile);
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+
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+ if (bs2b->fcut)
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+ bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
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+
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+ if (bs2b->feed)
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+ bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
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+
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+ return 0;
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+}
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+
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+static av_cold void uninit(AVFilterContext *ctx)
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+{
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+ Bs2bContext *bs2b = ctx->priv;
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+
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+ if (bs2b->bs2bp)
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+ bs2b_close(bs2b->bs2bp);
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+}
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+
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+static int query_formats(AVFilterContext *ctx)
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+{
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+ AVFilterFormats *formats = NULL;
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+ AVFilterChannelLayouts *layouts = NULL;
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+
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+ static const enum AVSampleFormat sample_fmts[] = {
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+ AV_SAMPLE_FMT_U8,
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+ AV_SAMPLE_FMT_S16,
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+ AV_SAMPLE_FMT_S32,
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+ AV_SAMPLE_FMT_FLT,
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+ AV_SAMPLE_FMT_DBL,
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+ AV_SAMPLE_FMT_NONE,
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+ };
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+
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+ if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
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+ return AVERROR(ENOMEM);
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+ ff_set_common_channel_layouts(ctx, layouts);
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+
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+ formats = ff_make_format_list(sample_fmts);
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+ if (!formats)
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+ return AVERROR(ENOMEM);
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+ ff_set_common_formats(ctx, formats);
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+
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+ formats = ff_all_samplerates();
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+ if (!formats)
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+ return AVERROR(ENOMEM);
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+ ff_set_common_samplerates(ctx, formats);
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+
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+ return 0;
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+}
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+
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+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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+{
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+ int ret;
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+ AVFrame *out_frame;
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+
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+ Bs2bContext *bs2b = inlink->dst->priv;
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+ AVFilterLink *outlink = inlink->dst->outputs[0];
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+
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+ if (av_frame_is_writable(frame)) {
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+ out_frame = frame;
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+ } else {
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+ out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
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+ if (!out_frame)
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+ return AVERROR(ENOMEM);
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+ av_frame_copy(out_frame, frame);
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+ ret = av_frame_copy_props(out_frame, frame);
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+ if (ret < 0) {
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+ av_frame_free(&out_frame);
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+ av_frame_free(&frame);
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+ return ret;
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+ }
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+ }
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+
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+ bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
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+
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+ if (frame != out_frame)
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+ av_frame_free(&frame);
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+
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+ return ff_filter_frame(outlink, out_frame);
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+}
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+
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+static int config_output(AVFilterLink *outlink)
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+{
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+ AVFilterContext *ctx = outlink->src;
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+ Bs2bContext *bs2b = ctx->priv;
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+ AVFilterLink *inlink = ctx->inputs[0];
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+
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+ int srate = inlink->sample_rate;
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+
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+ switch (inlink->format) {
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+ case AV_SAMPLE_FMT_U8:
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+ bs2b->filter = bs2b_cross_feed_u8;
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+ break;
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+ case AV_SAMPLE_FMT_S16:
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+ bs2b->filter = bs2b_cross_feed_s16;
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+ break;
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+ case AV_SAMPLE_FMT_S32:
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+ bs2b->filter = bs2b_cross_feed_s32;
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+ break;
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+ case AV_SAMPLE_FMT_FLT:
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+ bs2b->filter = bs2b_cross_feed_f;
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+ break;
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+ case AV_SAMPLE_FMT_DBL:
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+ bs2b->filter = bs2b_cross_feed_d;
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+ break;
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+ default:
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+ return AVERROR_BUG;
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+ }
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+
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+ if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
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+ return AVERROR(ENOSYS);
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+
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+ bs2b_set_srate(bs2b->bs2bp, srate);
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+
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+ return 0;
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+}
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+
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+static const AVFilterPad bs2b_inputs[] = {
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+ {
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+ .name = "default",
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+ .type = AVMEDIA_TYPE_AUDIO,
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+ .filter_frame = filter_frame,
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+ },
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+ { NULL }
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+};
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+
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+static const AVFilterPad bs2b_outputs[] = {
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+ {
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+ .name = "default",
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+ .type = AVMEDIA_TYPE_AUDIO,
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+ .config_props = config_output,
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+ },
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+ { NULL }
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+};
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+
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+AVFilter ff_af_bs2b = {
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+ .name = "bs2b",
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+ .description = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
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+ .query_formats = query_formats,
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+ .priv_size = sizeof(Bs2bContext),
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+ .priv_class = &bs2b_class,
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+ .init = init,
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+ .uninit = uninit,
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+ .inputs = bs2b_inputs,
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+ .outputs = bs2b_outputs,
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+};
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Alessandro Ghedini