/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
 * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
 * Copyright (c) 1999 Cameron Grant <cg@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.
 */

struct pcmchan_caps {
        u_int32_t minspeed, maxspeed;
        u_int32_t *fmtlist;
        u_int32_t caps;
};

struct pcmchan_matrix {
        int id;
        uint8_t channels, ext;
        struct {
                int type;
                uint32_t members;
        } map[SND_CHN_T_MAX + 1];
        uint32_t mask;
        int8_t offset[SND_CHN_T_MAX];
};

/* Forward declarations */
struct pcm_channel;
struct pcmchan_syncgroup;
struct pcmchan_syncmember;

extern struct mtx snd_pcm_syncgroups_mtx;
extern SLIST_HEAD(pcm_synclist, pcmchan_syncgroup) snd_pcm_syncgroups;

#define PCM_SG_LOCK()       mtx_lock(&snd_pcm_syncgroups_mtx)
#define PCM_SG_TRYLOCK()    mtx_trylock(&snd_pcm_syncgroups_mtx)
#define PCM_SG_UNLOCK()     mtx_unlock(&snd_pcm_syncgroups_mtx)
#define PCM_SG_LOCKASSERT(arg)  mtx_assert(&snd_pcm_syncgroups_mtx, arg)

/**
 * @brief Specifies an audio device sync group
 */
struct pcmchan_syncgroup {
        SLIST_ENTRY(pcmchan_syncgroup) link;
        SLIST_HEAD(, pcmchan_syncmember) members;
        int id; /**< Group identifier; set to address of group. */
};

/**
 * @brief Specifies a container for members of a sync group
 */
struct pcmchan_syncmember {
        SLIST_ENTRY(pcmchan_syncmember) link;
        struct pcmchan_syncgroup *parent; /**< group head */
        struct pcm_channel *ch;
};

#define CHN_NAMELEN             32
#define CHN_COMM_UNUSED         "<UNUSED>"
#define CHN_COMM_UNKNOWN        "<UNKNOWN>"

struct pcm_channel {
        kobj_t methods;

        pid_t pid;
        struct pcm_feeder *feeder;
        u_int32_t align;

        int latency;
        u_int32_t speed;
        u_int32_t format;
        u_int32_t flags;
        u_int32_t feederflags;
        u_int64_t blocks;

        int direction;
        unsigned int interrupts, xruns, feedcount;
        unsigned int timeout;
        struct snd_dbuf *bufhard, *bufsoft;
        struct snddev_info *parentsnddev;
        struct pcm_channel *parentchannel;
        void *devinfo;
        device_t dev;
        int unit;
        int type;
        char name[CHN_NAMELEN];
        char comm[MAXCOMLEN + 1];
        struct mtx lock;
        int trigger;
        /**
         * For interrupt manipulations.
         */
        struct cv intr_cv;
        /**
         * Increment,decrement this around operations that temporarily yield
         * lock.
         */
        unsigned int inprog;
        /* Incrememnt/decrement around cv_timedwait_sig() in chn_sleep(). */
        unsigned int sleeping;
        /**
         * Special channel operations should examine @c inprog after acquiring
         * lock.  If zero, operations may continue.  Else, thread should
         * wait on this cv for previous operation to finish.
         */
        struct cv cv;
        /**
         * Low water mark for select()/poll().
         *
         * This is initialized to the channel's fragment size, and will be
         * overwritten if a new fragment size is set.  Users may alter this
         * value directly with the @c SNDCTL_DSP_LOW_WATER ioctl.
         */
        unsigned int lw;
        /**
         * If part of a sync group, this will point to the syncmember
         * container.
         */
        struct pcmchan_syncmember *sm;
#ifdef OSSV4_EXPERIMENT
        u_int16_t lpeak, rpeak; /**< Peak value from 0-32767. */
#endif

        struct {
                SLIST_HEAD(, pcm_channel) head;
                SLIST_ENTRY(pcm_channel) link;
                struct {
                        SLIST_HEAD(, pcm_channel) head;
                        SLIST_ENTRY(pcm_channel) link;
                } busy;
        } children;

        struct {
                struct {
                        SLIST_ENTRY(pcm_channel) link;
                        struct {
                                SLIST_ENTRY(pcm_channel) link;
                        } busy;
                        struct {
                                SLIST_ENTRY(pcm_channel) link;
                        } opened;
                        struct {
                                SLIST_ENTRY(pcm_channel) link;
                        } primary;
                } pcm;
        } channels;

        struct pcmchan_matrix matrix;
        struct pcmchan_matrix matrix_scratch;

        int16_t volume[SND_VOL_C_MAX][SND_CHN_T_VOL_MAX];
        int8_t muted[SND_VOL_C_MAX][SND_CHN_T_VOL_MAX];
};

#define CHN_HEAD(x, y)                  &(x)->y.head
#define CHN_INIT(x, y)                  SLIST_INIT(CHN_HEAD(x, y))
#define CHN_LINK(y)                     y.link
#define CHN_EMPTY(x, y)                 SLIST_EMPTY(CHN_HEAD(x, y))
#define CHN_FIRST(x, y)                 SLIST_FIRST(CHN_HEAD(x, y))
#define CHN_NEXT(elm, list)             SLIST_NEXT((elm), CHN_LINK(list))

#define CHN_FOREACH(x, y, z)                                            \
        SLIST_FOREACH(x, CHN_HEAD(y, z), CHN_LINK(z))

#define CHN_FOREACH_SAFE(w, x, y, z)                                    \
        SLIST_FOREACH_SAFE(w, CHN_HEAD(x, z), CHN_LINK(z), y)

#define CHN_INSERT_HEAD(x, y, z)                                        \
        SLIST_INSERT_HEAD(CHN_HEAD(x, z), y, CHN_LINK(z))

#define CHN_INSERT_AFTER(x, y, z)                                       \
        SLIST_INSERT_AFTER(x, y, CHN_LINK(z))

#define CHN_INSERT_HEAD_SAFE(x, y, z)           do {                    \
        struct pcm_channel *t = NULL;                                   \
        CHN_FOREACH(t, x, z) {                                          \
                if (t == y)                                             \
                        break;                                          \
        }                                                               \
        if (t != y)                                                     \
                CHN_INSERT_HEAD(x, y, z);                               \
} while (0)

#define CHN_INSERT_AFTER_SAFE(w, x, y, z)       do {                    \
        struct pcm_channel *t = NULL;                                   \
        CHN_FOREACH(t, w, z) {                                          \
                if (t == y)                                             \
                        break;                                          \
        }                                                               \
        if (t != y)                                                     \
                CHN_INSERT_AFTER(x, y, z);                              \
} while (0)

#define CHN_REMOVE(holder, elm, list)           do {                    \
        if (CHN_FIRST(holder, list) == (elm)) {                         \
                SLIST_REMOVE_HEAD(CHN_HEAD(holder, list), CHN_LINK(list)); \
        } else {                                                        \
                struct pcm_channel *t = NULL;                           \
                CHN_FOREACH(t, holder, list) {                          \
                        if (CHN_NEXT(t, list) == (elm)) {               \
                                SLIST_REMOVE_AFTER(t, CHN_LINK(list));  \
                                break;                                  \
                        }                                               \
                }                                                       \
        }                                                               \
} while (0)

#define CHN_INSERT_SORT(w, x, y, z)             do {                    \
        struct pcm_channel *t, *a = NULL;                               \
        CHN_FOREACH(t, x, z) {                                          \
                if (((y)->type w t->type) ||                            \
                    (((y)->type == t->type) && ((y)->unit w t->unit)))  \
                        a = t;                                          \
                else                                                    \
                        break;                                          \
        }                                                               \
        if (a != NULL)                                                  \
                CHN_INSERT_AFTER(a, y, z);                              \
        else                                                            \
                CHN_INSERT_HEAD(x, y, z);                               \
} while (0)

#define CHN_INSERT_SORT_ASCEND(x, y, z)         CHN_INSERT_SORT(>, x, y, z)
#define CHN_INSERT_SORT_DESCEND(x, y, z)        CHN_INSERT_SORT(<, x, y, z)

#define CHN_BUF_PARENT(x, y)                                            \
        (((x) != NULL && (x)->parentchannel != NULL &&                  \
        (x)->parentchannel->bufhard != NULL) ?                          \
        (x)->parentchannel->bufhard : (y))

#include "channel_if.h"

int chn_write(struct pcm_channel *c, struct uio *buf);
int chn_read(struct pcm_channel *c, struct uio *buf);
u_int32_t chn_start(struct pcm_channel *c, int force);
int chn_sync(struct pcm_channel *c, int threshold);
int chn_flush(struct pcm_channel *c);
int chn_polltrigger(struct pcm_channel *c);
int chn_poll(struct pcm_channel *c, int ev, struct thread *td);

char *chn_mkname(char *buf, size_t len, struct pcm_channel *c);
struct pcm_channel *chn_init(struct snddev_info *d, struct pcm_channel *parent,
    kobj_class_t cls, int dir, void *devinfo);
void chn_kill(struct pcm_channel *c);
void chn_shutdown(struct pcm_channel *c);
int chn_release(struct pcm_channel *c);
int chn_reset(struct pcm_channel *c, u_int32_t fmt, u_int32_t spd);
int chn_setvolume_multi(struct pcm_channel *c, int vc, int left, int right,
    int center);
int chn_setvolume_matrix(struct pcm_channel *c, int vc, int vt, int val);
int chn_getvolume_matrix(struct pcm_channel *c, int vc, int vt);
int chn_setmute_multi(struct pcm_channel *c, int vc, int mute);
int chn_setmute_matrix(struct pcm_channel *c, int vc, int vt, int mute);
int chn_getmute_matrix(struct pcm_channel *c, int vc, int vt);
void chn_vpc_reset(struct pcm_channel *c, int vc, int force);
int chn_setparam(struct pcm_channel *c, uint32_t format, uint32_t speed);
int chn_setspeed(struct pcm_channel *c, uint32_t speed);
int chn_setformat(struct pcm_channel *c, uint32_t format);
int chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz);
int chn_setlatency(struct pcm_channel *c, int latency);
void chn_syncstate(struct pcm_channel *c);
int chn_trigger(struct pcm_channel *c, int go);
int chn_getptr(struct pcm_channel *c);
struct pcmchan_caps *chn_getcaps(struct pcm_channel *c);
u_int32_t chn_getformats(struct pcm_channel *c);

struct pcmchan_matrix *chn_getmatrix(struct pcm_channel *);
int chn_setmatrix(struct pcm_channel *, struct pcmchan_matrix *);

int chn_oss_getorder(struct pcm_channel *, unsigned long long *);
int chn_oss_setorder(struct pcm_channel *, unsigned long long *);
int chn_oss_getmask(struct pcm_channel *, uint32_t *);

void chn_resetbuf(struct pcm_channel *c);
void chn_intr(struct pcm_channel *c);
int chn_abort(struct pcm_channel *c);

int chn_notify(struct pcm_channel *c, u_int32_t flags);

int chn_getrates(struct pcm_channel *c, int **rates);
int chn_syncdestroy(struct pcm_channel *c);

#ifdef OSSV4_EXPERIMENT
int chn_getpeaks(struct pcm_channel *c, int *lpeak, int *rpeak);
#endif

#define CHN_LOCKOWNED(c)        mtx_owned(&(c)->lock)
#define CHN_LOCK(c)             mtx_lock(&(c)->lock)
#define CHN_UNLOCK(c)           mtx_unlock(&(c)->lock)
#define CHN_TRYLOCK(c)          mtx_trylock(&(c)->lock)
#define CHN_LOCKASSERT(c)       mtx_assert(&(c)->lock, MA_OWNED)
#define CHN_UNLOCKASSERT(c)     mtx_assert(&(c)->lock, MA_NOTOWNED)

#define CHN_BROADCAST(x)        cv_broadcastpri(x, PRIBIO)

int snd_fmtvalid(uint32_t fmt, uint32_t *fmtlist);

uint32_t snd_str2afmt(const char *);
uint32_t snd_afmt2str(uint32_t, char *, size_t);

#define AFMTSTR_LEN     16

extern int chn_latency;
extern int chn_latency_profile;
extern int report_soft_formats;
extern int report_soft_matrix;

enum {
        PCMDIR_PLAY = 1,
        PCMDIR_PLAY_VIRTUAL,
        PCMDIR_REC,
        PCMDIR_REC_VIRTUAL,
};

#define PCMTRIG_START 1
#define PCMTRIG_EMLDMAWR 2
#define PCMTRIG_EMLDMARD 3
#define PCMTRIG_STOP 0
#define PCMTRIG_ABORT -1

#define PCMTRIG_COMMON(x)       ((x) == PCMTRIG_START ||                \
                                 (x) == PCMTRIG_STOP ||                 \
                                 (x) == PCMTRIG_ABORT)

#define CHN_F_CLOSING           0x00000001  /* a pending close */
#define CHN_F_ABORTING          0x00000002  /* a pending abort */
#define CHN_F_RUNNING           0x00000004  /* dma is running */
#define CHN_F_TRIGGERED         0x00000008
#define CHN_F_NOTRIGGER         0x00000010
/* unused                       0x00000020 */

#define CHN_F_NBIO              0x00000040  /* do non-blocking i/o */
#define CHN_F_MMAP              0x00000080  /* has been mmap()ed */

#define CHN_F_BUSY              0x00000100  /* has been opened  */
#define CHN_F_DIRTY             0x00000200  /* need re-config */
#define CHN_F_DEAD              0x00000400  /* too many errors, dead, mdk */
/* unused                       0x00000800 */

#define CHN_F_HAS_SIZE          0x00001000  /* user set block size */
#define CHN_F_HAS_VCHAN         0x00002000  /* vchan master */

#define CHN_F_VCHAN_PASSTHROUGH 0x00004000  /* digital ac3/dts passthrough */
#define CHN_F_VCHAN_ADAPTIVE    0x00008000  /* adaptive format/rate selection */
#define CHN_F_VCHAN_DYNAMIC     (CHN_F_VCHAN_PASSTHROUGH | CHN_F_VCHAN_ADAPTIVE)

#define CHN_F_VIRTUAL           0x10000000  /* not backed by hardware */
#define CHN_F_BITPERFECT        0x20000000  /* un-cooked, Heh.. */
#define CHN_F_PASSTHROUGH       0x40000000  /* passthrough re-config */
#define CHN_F_EXCLUSIVE         0x80000000  /* exclusive access */

#define CHN_F_BITS              "\020"                                  \
                                "\001CLOSING"                           \
                                "\002ABORTING"                          \
                                "\003RUNNING"                           \
                                "\004TRIGGERED"                         \
                                "\005NOTRIGGER"                         \
                                /* \006 */                              \
                                "\007NBIO"                              \
                                "\010MMAP"                              \
                                "\011BUSY"                              \
                                "\012DIRTY"                             \
                                "\013DEAD"                              \
                                /* \014 */                              \
                                "\015HAS_SIZE"                          \
                                "\016HAS_VCHAN"                         \
                                "\017VCHAN_PASSTHROUGH"                 \
                                "\020VCHAN_ADAPTIVE"                    \
                                "\035VIRTUAL"                           \
                                "\036BITPERFECT"                        \
                                "\037PASSTHROUGH"                       \
                                "\040EXCLUSIVE"

#define CHN_F_RESET             (CHN_F_BUSY | CHN_F_DEAD |              \
                                 CHN_F_VIRTUAL | CHN_F_HAS_VCHAN |      \
                                 CHN_F_VCHAN_DYNAMIC | CHN_F_NBIO |     \
                                 CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE)

#define CHN_F_MMAP_INVALID      (CHN_F_DEAD | CHN_F_RUNNING)

                                        

#define CHN_N_BLOCKSIZE         0x00000001
#define CHN_N_TRIGGER           0x00000002

#define CHN_LATENCY_MIN         0
#define CHN_LATENCY_MAX         10
#define CHN_LATENCY_DEFAULT     2       /* 21.3ms total buffering */
#define CHN_POLICY_MIN          CHN_LATENCY_MIN
#define CHN_POLICY_MAX          CHN_LATENCY_MAX
#define CHN_POLICY_DEFAULT      CHN_LATENCY_DEFAULT

#define CHN_LATENCY_PROFILE_MIN         0
#define CHN_LATENCY_PROFILE_MAX         1
#define CHN_LATENCY_PROFILE_DEFAULT     CHN_LATENCY_PROFILE_MAX

#define CHN_STARTED(c)          ((c)->flags & CHN_F_TRIGGERED)
#define CHN_STOPPED(c)          (!CHN_STARTED(c))
#define CHN_DIRSTR(c)           (((c)->direction == PCMDIR_PLAY) ? \
                                "PCMDIR_PLAY" : "PCMDIR_REC")
#define CHN_BITPERFECT(c)       ((c)->flags & CHN_F_BITPERFECT)
#define CHN_PASSTHROUGH(c)      ((c)->flags & CHN_F_PASSTHROUGH)

#define CHN_TIMEOUT             5
#define CHN_TIMEOUT_MIN         1
#define CHN_TIMEOUT_MAX         10

/*
 * This should be large enough to hold all pcm data between
 * tsleeps in chn_{read,write} at the highest sample rate.
 * (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec)
 */
#define CHN_2NDBUFBLKSIZE       (2 * 1024)
/* The total number of blocks per secondary bufhard. */
#define CHN_2NDBUFBLKNUM        (32)
/* The size of a whole secondary bufhard. */
#define CHN_2NDBUFMAXSIZE       (131072)

#define CHANNEL_DECLARE(name) static DEFINE_CLASS(name, name ## _methods, sizeof(struct kobj))