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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2008-2009 Ariff Abdullah <ariff@FreeBSD.org>
* All rights reserved.
* Copyright (c) 2024-2025 The FreeBSD Foundation
*
* Portions of this software were developed by Christos Margiolis
* <christos@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* feeder_format: New generation of generic, any-to-any format converter, as
* long as the sample values can be read _and_ write.
*/
#ifdef _KERNEL
#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_snd.h"
#endif
#include <dev/sound/pcm/sound.h>
#include <dev/sound/pcm/pcm.h>
#include "feeder_if.h"
#define SND_USE_FXDIV
#include "snd_fxdiv_gen.h"
#endif
#define FEEDFORMAT_RESERVOIR (SND_CHN_MAX * PCM_32_BPS)
struct feed_format_info {
uint32_t ibps, obps;
uint32_t ialign, oalign, channels;
uint32_t rdfmt, wrfmt;
uint8_t reservoir[FEEDFORMAT_RESERVOIR];
};
static int
feed_format_init(struct pcm_feeder *f)
{
struct feed_format_info *info;
if (f->desc->in == f->desc->out ||
AFMT_CHANNEL(f->desc->in) != AFMT_CHANNEL(f->desc->out))
return (EINVAL);
info = malloc(sizeof(*info), M_DEVBUF, M_NOWAIT | M_ZERO);
if (info == NULL)
return (ENOMEM);
info->channels = AFMT_CHANNEL(f->desc->in);
info->ibps = AFMT_BPS(f->desc->in);
info->ialign = info->ibps * info->channels;
info->rdfmt = AFMT_ENCODING(f->desc->in);
info->obps = AFMT_BPS(f->desc->out);
info->oalign = info->obps * info->channels;
info->wrfmt = AFMT_ENCODING(f->desc->out);
f->data = info;
return (0);
}
static int
feed_format_free(struct pcm_feeder *f)
{
struct feed_format_info *info;
info = f->data;
if (info != NULL)
free(info, M_DEVBUF);
f->data = NULL;
return (0);
}
static int
feed_format_set(struct pcm_feeder *f, int what, int value)
{
struct feed_format_info *info;
info = f->data;
switch (what) {
case FEEDFORMAT_CHANNELS:
if (value < SND_CHN_MIN || value > SND_CHN_MAX)
return (EINVAL);
info->channels = (uint32_t)value;
info->ialign = info->ibps * info->channels;
info->oalign = info->obps * info->channels;
break;
default:
return (EINVAL);
break;
}
return (0);
}
static int
feed_format_feed(struct pcm_feeder *f, struct pcm_channel *c, uint8_t *b,
uint32_t count, void *source)
{
struct feed_format_info *info;
intpcm_t v;
uint32_t j;
uint8_t *src, *dst;
info = f->data;
dst = b;
count = SND_FXROUND(count, info->oalign);
do {
if (count < info->oalign)
break;
if (count < info->ialign) {
src = info->reservoir;
j = info->ialign;
} else {
if (info->ialign == info->oalign)
j = count;
else if (info->ialign > info->oalign)
j = SND_FXROUND(count, info->ialign);
else
j = SND_FXDIV(count, info->oalign) *
info->ialign;
src = dst + count - j;
}
j = SND_FXDIV(FEEDER_FEED(f->source, c, src, j, source),
info->ialign);
if (j == 0)
break;
j *= info->channels;
count -= j * info->obps;
do {
v = pcm_sample_read_norm(src, info->rdfmt);
pcm_sample_write_norm(dst, v, info->wrfmt);
dst += info->obps;
src += info->ibps;
} while (--j != 0);
} while (count != 0);
return (dst - b);
}
static struct pcm_feederdesc feeder_format_desc[] = {
{ FEEDER_FORMAT, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 }
};
static kobj_method_t feeder_format_methods[] = {
KOBJMETHOD(feeder_init, feed_format_init),
KOBJMETHOD(feeder_free, feed_format_free),
KOBJMETHOD(feeder_set, feed_format_set),
KOBJMETHOD(feeder_feed, feed_format_feed),
KOBJMETHOD_END
};
FEEDER_DECLARE(feeder_format, NULL);
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