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/*
* The Bauer stereophonic-to-binaural DSP using bs2b library:
* http://bs2b.sourceforge.net/
*
* Copyright (c) 2009 Andrew Savchenko
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <bs2b.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include "af.h"
#include "options/m_option.h"
/// Internal specific data of the filter
struct af_bs2b {
int fcut; ///< cut frequency in Hz
int feed; ///< feed level for low frequencies in 0.1*dB
int profile ; ///< profile (available crossfeed presets)
t_bs2bdp filter; ///< instance of a library filter
};
#define DEF_FILTER(fmt, name) \
static int filter_##name(struct af_instance *af, struct mp_audio *data) \
{ \
if (!data) \
return 0; \
if (af_make_writeable(af, data) < 0) { \
talloc_free(data); \
return -1; \
} \
bs2b_cross_feed_##name(((struct af_bs2b*)(af->priv))->filter, \
(data->planes[0]), data->samples); \
af_add_output_frame(af, data); \
return 0; \
}
#define GET_FILTER(fmt, name) \
case AF_FORMAT_##fmt: return filter_##name;
#define FILTERS \
FILTER(FLOAT, f) \
FILTER(S32, s32) \
FILTER(U32, u32) \
FILTER(S24, s24) \
FILTER(U24, u24) \
FILTER(S16, s16) \
FILTER(U16, u16) \
FILTER(S8, s8) \
FILTER(U8, u8)
#define FILTER DEF_FILTER
FILTERS
#undef FILTER
typedef int (*filter)(struct af_instance *af, struct mp_audio *d);
static filter get_filter(int fmt)
{
switch (fmt) {
#define FILTER GET_FILTER
FILTERS
#undef FILTER
default: return NULL;
}
}
/// Initialization and runtime control
static int control(struct af_instance *af, int cmd, void *arg)
{
struct af_bs2b *s = af->priv;
switch (cmd) {
case AF_CONTROL_REINIT: {
int format;
// Sanity check
if (!arg) return AF_ERROR;
format = ((struct mp_audio*)arg)->format;
af->data->rate = ((struct mp_audio*)arg)->rate;
mp_audio_set_num_channels(af->data, 2); // bs2b is useful only for 2ch audio
mp_audio_set_format(af->data, format);
/* check for formats supported by libbs2b
and assign corresponding handlers */
af->filter_frame = get_filter(format);
if (!af->filter_frame) {
af->filter_frame = filter_f;
mp_audio_set_format(af->data, AF_FORMAT_FLOAT);
}
// bs2b have srate limits, try to resample if needed
if (af->data->rate > BS2B_MAXSRATE || af->data->rate < BS2B_MINSRATE) {
af->data->rate = BS2B_DEFAULT_SRATE;
MP_WARN(af, "Requested sample rate %d Hz is out of bounds [%d..%d] Hz.\n"
"Trying to resample to %d Hz.\n",
af->data->rate, BS2B_MINSRATE, BS2B_MAXSRATE, BS2B_DEFAULT_SRATE);
}
bs2b_set_srate(s->filter, (long)af->data->rate);
MP_VERBOSE(af, "using format %s\n",
af_fmt_to_str(af->data->format));
return af_test_output(af,(struct mp_audio*)arg);
}
}
return AF_UNKNOWN;
}
/// Deallocate memory and close library
static void uninit(struct af_instance *af)
{
struct af_bs2b *s = af->priv;
if (s->filter)
bs2b_close(s->filter);
}
/// Allocate memory, set function pointers and init library
static int af_open(struct af_instance *af)
{
struct af_bs2b *s = af->priv;
af->control = control;
af->uninit = uninit;
// NULL means failed initialization
if (!(s->filter = bs2b_open())) {
return AF_ERROR;
}
if (s->profile)
bs2b_set_level(s->filter, s->profile);
// set fcut and feed only if specified, otherwise defaults will be used
if (s->fcut)
bs2b_set_level_fcut(s->filter, s->fcut);
if (s->feed)
bs2b_set_level_feed(s->filter, s->feed);
return AF_OK;
}
#define OPT_BASE_STRUCT struct af_bs2b
/// Description of this filter
const struct af_info af_info_bs2b = {
.info = "Bauer stereophonic-to-binaural audio filter",
.name = "bs2b",
.open = af_open,
.priv_size = sizeof(struct af_bs2b),
.options = (const struct m_option[]) {
OPT_INTRANGE("fcut", fcut, 0, BS2B_MINFCUT, BS2B_MAXFCUT),
OPT_INTRANGE("feed", feed, 0, BS2B_MINFEED, BS2B_MAXFEED),
OPT_CHOICE("profile", profile, 0,
({"default", BS2B_DEFAULT_CLEVEL},
{"cmoy", BS2B_CMOY_CLEVEL},
{"jmeier", BS2B_JMEIER_CLEVEL})),
{0}
},
};
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