Merge commit '1c0210c7981b6a61043d9171f506b435ff5a1f5e'

* commit '1c0210c7981b6a61043d9171f506b435ff5a1f5e':
  lavfi: add Bauer stereo-to-binaural audio filter

Conflicts:
	Changelog
	configure
	doc/filters.texi
	libavfilter/Makefile
	libavfilter/allfilters.c
	libavfilter/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>

7 files changed, 260 insertions, 1 deletions

diff --git a/Changelog b/Changelog
index df3433cb43..8d61c9d38f 100644
--- a/Changelog
+++ b/Changelog
@@ -21,6 +21,7 @@ version <next>:
 - Magic Lantern Video (MLV) demuxer
 - On2 AVC (Audio for Video) decoder
 - support for decoding through DXVA2 in ffmpeg
+- libbs2b-based stereo-to-binaural audio filter
 
 
 version 2.2:
diff --git a/configure b/configure
index ee4393941a..261fedb566 100755
--- a/configure
+++ b/configure
@@ -199,6 +199,7 @@ External library support:
   --enable-libaacplus      enable AAC+ encoding via libaacplus [no]
   --enable-libass          enable libass subtitles rendering [no]
   --enable-libbluray       enable BluRay reading using libbluray [no]
+  --enable-libbs2b         enable bs2b DSP library [no]
   --enable-libcaca         enable textual display using libcaca
   --enable-libcelt         enable CELT decoding via libcelt [no]
   --enable-libcdio         enable audio CD grabbing with libcdio
@@ -1311,6 +1312,7 @@ EXTERNAL_LIBRARY_LIST="
     libaacplus
     libass
     libbluray
+    libbs2b
     libcaca
     libcdio
     libcelt
@@ -2464,6 +2466,7 @@ atempo_filter_select="rdft"
 azmq_filter_deps="libzmq"
 blackframe_filter_deps="gpl"
 boxblur_filter_deps="gpl"
+bs2b_filter_deps="libbs2b"
 colormatrix_filter_deps="gpl"
 cropdetect_filter_deps="gpl"
 dctdnoiz_filter_deps="avcodec"
@@ -4604,6 +4607,7 @@ enabled libiec61883       && require libiec61883 libiec61883/iec61883.h iec61883
 enabled libaacplus        && require "libaacplus >= 2.0.0" aacplus.h aacplusEncOpen -laacplus
 enabled libass            && require_pkg_config libass ass/ass.h ass_library_init
 enabled libbluray         && require_pkg_config libbluray libbluray/bluray.h bd_open
+enabled libbs2b           && require_pkg_config libbs2b bs2b.h bs2b_open
 enabled libcelt           && require libcelt celt/celt.h celt_decode -lcelt0 &&
                              { check_lib celt/celt.h celt_decoder_create_custom -lcelt0 ||
                                die "ERROR: libcelt must be installed and version must be >= 0.11.0."; }
diff --git a/doc/filters.texi b/doc/filters.texi
index d53f645a55..93548e1a7a 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1206,6 +1206,36 @@ Apply a biquad IIR filter with the given coefficients.
 Where @var{b0}, @var{b1}, @var{b2} and @var{a0}, @var{a1}, @var{a2}
 are the numerator and denominator coefficients respectively.
 
+@section bs2b
+Bauer stereo to binaural transformation, which improves headphone listening of
+stereo audio records.
+
+It accepts the following parameters:
+@table @option
+
+@item profile
+Pre-defined crossfeed level.
+@table @option
+
+@item default
+Default level (fcut=700, feed=50).
+
+@item cmoy
+Chu Moy circuit (fcut=700, feed=60).
+
+@item jmeier
+Jan Meier circuit (fcut=650, feed=95).
+
+@end table
+
+@item fcut
+Cut frequency (in Hz).
+
+@item feed
+Feed level (in Hz).
+
+@end table
+
 @section channelmap
 
 Remap input channels to new locations.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 7e66c91668..65786cf0c1 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -85,6 +85,7 @@ OBJS-$(CONFIG_BANDPASS_FILTER)               += af_biquads.o
 OBJS-$(CONFIG_BANDREJECT_FILTER)             += af_biquads.o
 OBJS-$(CONFIG_BASS_FILTER)                   += af_biquads.o
 OBJS-$(CONFIG_BIQUAD_FILTER)                 += af_biquads.o
+OBJS-$(CONFIG_BS2B_FILTER)                   += af_bs2b.o
 OBJS-$(CONFIG_CHANNELMAP_FILTER)             += af_channelmap.o
 OBJS-$(CONFIG_CHANNELSPLIT_FILTER)           += af_channelsplit.o
 OBJS-$(CONFIG_COMPAND_FILTER)                += af_compand.o
diff --git a/libavfilter/af_bs2b.c b/libavfilter/af_bs2b.c
new file mode 100644
index 0000000000..5c8e8e5dd8
--- /dev/null
+++ b/libavfilter/af_bs2b.c
@@ -0,0 +1,222 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Bauer stereo-to-binaural filter
+ */
+
+#include <bs2b.h>
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+
+#include "audio.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+
+typedef struct Bs2bContext {
+    const AVClass *class;
+
+    int profile;
+    int fcut;
+    int feed;
+
+    t_bs2bdp bs2bp;
+
+    void (*filter)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
+} Bs2bContext;
+
+#define OFFSET(x) offsetof(Bs2bContext, x)
+#define A AV_OPT_FLAG_AUDIO_PARAM
+
+static const AVOption options[] = {
+    { "profile", "Apply a pre-defined crossfeed level",
+            OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, INT_MAX, A, "profile" },
+        { "default", "default profile", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, 0, A, "profile" },
+        { "cmoy",    "Chu Moy circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_CMOY_CLEVEL    }, 0, 0, A, "profile" },
+        { "jmeier",  "Jan Meier circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_JMEIER_CLEVEL  }, 0, 0, A, "profile" },
+    { "fcut", "Set cut frequency (in Hz)",
+            OFFSET(fcut), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFCUT, A },
+    { "feed", "Set feed level (in Hz)",
+            OFFSET(feed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFEED, A },
+    { NULL },
+};
+
+static const AVClass bs2b_class = {
+    .class_name = "bs2b filter",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    Bs2bContext *bs2b = ctx->priv;
+
+    if (!(bs2b->bs2bp = bs2b_open()))
+        return AVERROR(ENOMEM);
+
+    bs2b_set_level(bs2b->bs2bp, bs2b->profile);
+
+    if (bs2b->fcut)
+        bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
+
+    if (bs2b->feed)
+        bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
+
+    return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    Bs2bContext *bs2b = ctx->priv;
+
+    if (bs2b->bs2bp)
+        bs2b_close(bs2b->bs2bp);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layouts = NULL;
+
+    static const enum AVSampleFormat sample_fmts[] = {
+        AV_SAMPLE_FMT_U8,
+        AV_SAMPLE_FMT_S16,
+        AV_SAMPLE_FMT_S32,
+        AV_SAMPLE_FMT_FLT,
+        AV_SAMPLE_FMT_DBL,
+        AV_SAMPLE_FMT_NONE,
+    };
+
+    if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
+        return AVERROR(ENOMEM);
+    ff_set_common_channel_layouts(ctx, layouts);
+
+    formats = ff_make_format_list(sample_fmts);
+    if (!formats)
+        return AVERROR(ENOMEM);
+    ff_set_common_formats(ctx, formats);
+
+    formats = ff_all_samplerates();
+    if (!formats)
+        return AVERROR(ENOMEM);
+    ff_set_common_samplerates(ctx, formats);
+
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+    int ret;
+    AVFrame *out_frame;
+
+    Bs2bContext     *bs2b = inlink->dst->priv;
+    AVFilterLink *outlink = inlink->dst->outputs[0];
+
+    if (av_frame_is_writable(frame)) {
+        out_frame = frame;
+    } else {
+        out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
+        if (!out_frame)
+            return AVERROR(ENOMEM);
+        av_frame_copy(out_frame, frame);
+        ret = av_frame_copy_props(out_frame, frame);
+        if (ret < 0) {
+            av_frame_free(&out_frame);
+            av_frame_free(&frame);
+            return ret;
+        }
+    }
+
+    bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
+
+    if (frame != out_frame)
+        av_frame_free(&frame);
+
+    return ff_filter_frame(outlink, out_frame);
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    Bs2bContext    *bs2b = ctx->priv;
+    AVFilterLink *inlink = ctx->inputs[0];
+
+    int srate = inlink->sample_rate;
+
+    switch (inlink->format) {
+    case AV_SAMPLE_FMT_U8:
+        bs2b->filter = bs2b_cross_feed_u8;
+        break;
+    case AV_SAMPLE_FMT_S16:
+        bs2b->filter = bs2b_cross_feed_s16;
+        break;
+    case AV_SAMPLE_FMT_S32:
+        bs2b->filter = bs2b_cross_feed_s32;
+        break;
+    case AV_SAMPLE_FMT_FLT:
+        bs2b->filter = bs2b_cross_feed_f;
+        break;
+    case AV_SAMPLE_FMT_DBL:
+        bs2b->filter = bs2b_cross_feed_d;
+        break;
+    default:
+        return AVERROR_BUG;
+    }
+
+    if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
+        return AVERROR(ENOSYS);
+
+    bs2b_set_srate(bs2b->bs2bp, srate);
+
+    return 0;
+}
+
+static const AVFilterPad bs2b_inputs[] = {
+    {
+        .name           = "default",
+        .type           = AVMEDIA_TYPE_AUDIO,
+        .filter_frame   = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad bs2b_outputs[] = {
+    {
+        .name           = "default",
+        .type           = AVMEDIA_TYPE_AUDIO,
+        .config_props   = config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_af_bs2b = {
+    .name           = "bs2b",
+    .description    = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
+    .query_formats  = query_formats,
+    .priv_size      = sizeof(Bs2bContext),
+    .priv_class     = &bs2b_class,
+    .init           = init,
+    .uninit         = uninit,
+    .inputs         = bs2b_inputs,
+    .outputs        = bs2b_outputs,
+};
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index e351eac5ff..22d643d3e1 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -80,6 +80,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(BANDREJECT,     bandreject,     af);
     REGISTER_FILTER(BASS,           bass,           af);
     REGISTER_FILTER(BIQUAD,         biquad,         af);
+    REGISTER_FILTER(BS2B,           bs2b,           af);
     REGISTER_FILTER(CHANNELMAP,     channelmap,     af);
     REGISTER_FILTER(CHANNELSPLIT,   channelsplit,   af);
     REGISTER_FILTER(COMPAND,        compand,        af);
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 1540d55bb0..7a6321e53e 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   4
-#define LIBAVFILTER_VERSION_MINOR   4
+#define LIBAVFILTER_VERSION_MINOR   5
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \