/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
 * All rights reserved.
 * Copyright (c) 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.
 */

#define SNDBUF_F_MANAGED        0x00000001

#define SNDBUF_NAMELEN  48

struct snd_dbuf {
        u_int8_t *buf, *tmpbuf;
        u_int8_t *shadbuf; /**< shadow buffer used w/ S_D_SILENCE/SKIP */
        volatile int sl; /**< shadbuf ready length in # of bytes */
        unsigned int bufsize, maxsize, allocsize;
        volatile int dl; /* transfer size */
        volatile int rp; /* pointers to the ready area */
        volatile int rl; /* length of ready area */
        volatile int hp;
        volatile u_int64_t total, prev_total;
        int dmachan;       /* dma channel */
        u_int32_t fmt, spd, bps, align;
        unsigned int blksz, blkcnt;
        int xrun;
        u_int32_t flags;
        bus_dmamap_t dmamap;
        bus_dma_tag_t dmatag;
        bus_addr_t buf_addr;
        int dmaflags;
        struct selinfo sel;
        struct pcm_channel *channel;
        char name[SNDBUF_NAMELEN];
};

struct snd_dbuf *sndbuf_create(struct pcm_channel *channel, const char *desc);
void sndbuf_destroy(struct snd_dbuf *b);

int sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, int dmaflags, unsigned int size);
int sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size);
void sndbuf_free(struct snd_dbuf *b);
int sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
int sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
void sndbuf_reset(struct snd_dbuf *b);
void sndbuf_clear(struct snd_dbuf *b, unsigned int length);
void sndbuf_fillsilence(struct snd_dbuf *b);
void sndbuf_fillsilence_rl(struct snd_dbuf *b, u_int rl);
void sndbuf_softreset(struct snd_dbuf *b);
void sndbuf_clearshadow(struct snd_dbuf *b);

int sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt);
void sndbuf_setspd(struct snd_dbuf *b, unsigned int spd);

void *sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs);
unsigned int sndbuf_runsz(struct snd_dbuf *b);
void sndbuf_setrun(struct snd_dbuf *b, int go);

void sndbuf_setxrun(struct snd_dbuf *b, unsigned int xrun);
unsigned int sndbuf_getfree(struct snd_dbuf *b);
unsigned int sndbuf_getfreeptr(struct snd_dbuf *b);
unsigned int sndbuf_getready(struct snd_dbuf *b);
unsigned int sndbuf_getreadyptr(struct snd_dbuf *b);
u_int64_t sndbuf_getblocks(struct snd_dbuf *b);
unsigned int sndbuf_xbytes(unsigned int v, struct snd_dbuf *from, struct snd_dbuf *to);
u_int8_t sndbuf_zerodata(u_int32_t fmt);

int sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count);
int sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count);
int sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count);

#ifdef OSSV4_EXPERIMENT
void sndbuf_getpeaks(struct snd_dbuf *b, int *lp, int *rp);
#endif

static inline u_int32_t
snd_xbytes(u_int32_t v, u_int32_t from, u_int32_t to)
{

        if (from == to)
                return (v);
        if (from == 0)
                return (0);
        return ((u_int64_t)v * to / from);
}