The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/channel.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    5  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
    6  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD: stable/12/sys/dev/sound/pcm/channel.h 352324 2019-09-14 13:30:22Z hselasky $
   31  */
   32 
   33 struct pcmchan_caps {
   34         u_int32_t minspeed, maxspeed;
   35         u_int32_t *fmtlist;
   36         u_int32_t caps;
   37 };
   38 
   39 struct pcmchan_matrix {
   40         int id;
   41         uint8_t channels, ext;
   42         struct {
   43                 int type;
   44                 uint32_t members;
   45         } map[SND_CHN_T_MAX + 1];
   46         uint32_t mask;
   47         int8_t offset[SND_CHN_T_MAX];
   48 };
   49 
   50 /* Forward declarations */
   51 struct pcm_channel;
   52 struct pcmchan_syncgroup;
   53 struct pcmchan_syncmember;
   54 
   55 extern struct mtx snd_pcm_syncgroups_mtx;
   56 extern SLIST_HEAD(pcm_synclist, pcmchan_syncgroup) snd_pcm_syncgroups;
   57 
   58 #define PCM_SG_LOCK()       mtx_lock(&snd_pcm_syncgroups_mtx)
   59 #define PCM_SG_TRYLOCK()    mtx_trylock(&snd_pcm_syncgroups_mtx)
   60 #define PCM_SG_UNLOCK()     mtx_unlock(&snd_pcm_syncgroups_mtx)
   61 #define PCM_SG_LOCKASSERT(arg)  mtx_assert(&snd_pcm_syncgroups_mtx, arg)
   62 
   63 /**
   64  * @brief Specifies an audio device sync group
   65  */
   66 struct pcmchan_syncgroup {
   67         SLIST_ENTRY(pcmchan_syncgroup) link;
   68         SLIST_HEAD(, pcmchan_syncmember) members;
   69         int id; /**< Group identifier; set to address of group. */
   70 };
   71 
   72 /**
   73  * @brief Specifies a container for members of a sync group
   74  */
   75 struct pcmchan_syncmember {
   76         SLIST_ENTRY(pcmchan_syncmember) link;
   77         struct pcmchan_syncgroup *parent; /**< group head */
   78         struct pcm_channel *ch;
   79 };
   80 
   81 #define CHN_NAMELEN             32
   82 #define CHN_COMM_UNUSED         "<UNUSED>"
   83 #define CHN_COMM_UNKNOWN        "<UNKNOWN>"
   84 
   85 struct pcm_channel {
   86         kobj_t methods;
   87 
   88         pid_t pid;
   89         int refcount;
   90         struct pcm_feeder *feeder;
   91         u_int32_t align;
   92 
   93         int latency;
   94         u_int32_t speed;
   95         u_int32_t format;
   96         u_int32_t flags;
   97         u_int32_t feederflags;
   98         u_int64_t blocks;
   99 
  100         int direction;
  101         unsigned int interrupts, xruns, feedcount;
  102         unsigned int timeout;
  103         struct snd_dbuf *bufhard, *bufsoft;
  104         struct snddev_info *parentsnddev;
  105         struct pcm_channel *parentchannel;
  106         void *devinfo;
  107         device_t dev;
  108         int unit;
  109         char name[CHN_NAMELEN];
  110         char comm[MAXCOMLEN + 1];
  111         struct mtx *lock;
  112         int trigger;
  113         /**
  114          * For interrupt manipulations.
  115          */
  116         struct cv intr_cv;
  117         /**
  118          * Increment,decrement this around operations that temporarily yield
  119          * lock.
  120          */
  121         unsigned int inprog;
  122         /**
  123          * Special channel operations should examine @c inprog after acquiring
  124          * lock.  If zero, operations may continue.  Else, thread should
  125          * wait on this cv for previous operation to finish.
  126          */
  127         struct cv cv;
  128         /**
  129          * Low water mark for select()/poll().
  130          *
  131          * This is initialized to the channel's fragment size, and will be
  132          * overwritten if a new fragment size is set.  Users may alter this
  133          * value directly with the @c SNDCTL_DSP_LOW_WATER ioctl.
  134          */
  135         unsigned int lw;
  136         /**
  137          * If part of a sync group, this will point to the syncmember
  138          * container.
  139          */
  140         struct pcmchan_syncmember *sm;
  141 #ifdef OSSV4_EXPERIMENT
  142         u_int16_t lpeak, rpeak; /**< Peak value from 0-32767. */
  143 #endif
  144 
  145         struct {
  146                 SLIST_HEAD(, pcm_channel) head;
  147                 SLIST_ENTRY(pcm_channel) link;
  148                 struct {
  149                         SLIST_HEAD(, pcm_channel) head;
  150                         SLIST_ENTRY(pcm_channel) link;
  151                 } busy;
  152         } children;
  153 
  154         struct {
  155                 struct {
  156                         SLIST_ENTRY(pcm_channel) link;
  157                         struct {
  158                                 SLIST_ENTRY(pcm_channel) link;
  159                         } busy;
  160                         struct {
  161                                 SLIST_ENTRY(pcm_channel) link;
  162                         } opened;
  163                 } pcm;
  164         } channels;
  165 
  166         struct pcmchan_matrix matrix;
  167         struct pcmchan_matrix matrix_scratch;
  168 
  169         int volume[SND_VOL_C_MAX][SND_CHN_T_VOL_MAX];
  170 
  171         void *data1, *data2;
  172 };
  173 
  174 #define CHN_HEAD(x, y)                  &(x)->y.head
  175 #define CHN_INIT(x, y)                  SLIST_INIT(CHN_HEAD(x, y))
  176 #define CHN_LINK(y)                     y.link
  177 #define CHN_EMPTY(x, y)                 SLIST_EMPTY(CHN_HEAD(x, y))
  178 #define CHN_FIRST(x, y)                 SLIST_FIRST(CHN_HEAD(x, y))
  179 
  180 #define CHN_FOREACH(x, y, z)                                            \
  181         SLIST_FOREACH(x, CHN_HEAD(y, z), CHN_LINK(z))
  182 
  183 #define CHN_FOREACH_SAFE(w, x, y, z)                                    \
  184         SLIST_FOREACH_SAFE(w, CHN_HEAD(x, z), CHN_LINK(z), y)
  185 
  186 #define CHN_INSERT_HEAD(x, y, z)                                        \
  187         SLIST_INSERT_HEAD(CHN_HEAD(x, z), y, CHN_LINK(z))
  188 
  189 #define CHN_INSERT_AFTER(x, y, z)                                       \
  190         SLIST_INSERT_AFTER(x, y, CHN_LINK(z))
  191 
  192 #define CHN_REMOVE(x, y, z)                                             \
  193         SLIST_REMOVE(CHN_HEAD(x, z), y, pcm_channel, CHN_LINK(z))
  194 
  195 #define CHN_INSERT_HEAD_SAFE(x, y, z)           do {                    \
  196         struct pcm_channel *t = NULL;                                   \
  197         CHN_FOREACH(t, x, z) {                                          \
  198                 if (t == y)                                             \
  199                         break;                                          \
  200         }                                                               \
  201         if (t != y)                                                     \
  202                 CHN_INSERT_HEAD(x, y, z);                               \
  203 } while (0)
  204 
  205 #define CHN_INSERT_AFTER_SAFE(w, x, y, z)       do {                    \
  206         struct pcm_channel *t = NULL;                                   \
  207         CHN_FOREACH(t, w, z) {                                          \
  208                 if (t == y)                                             \
  209                         break;                                          \
  210         }                                                               \
  211         if (t != y)                                                     \
  212                 CHN_INSERT_AFTER(x, y, z);                              \
  213 } while (0)
  214 
  215 #define CHN_REMOVE_SAFE(x, y, z)                do {                    \
  216         struct pcm_channel *t = NULL;                                   \
  217         CHN_FOREACH(t, x, z) {                                          \
  218                 if (t == y)                                             \
  219                         break;                                          \
  220         }                                                               \
  221         if (t == y)                                                     \
  222                 CHN_REMOVE(x, y, z);                                    \
  223 } while (0)
  224 
  225 #define CHN_INSERT_SORT(w, x, y, z)             do {                    \
  226         struct pcm_channel *t, *a = NULL;                               \
  227         CHN_FOREACH(t, x, z) {                                          \
  228                 if ((y)->unit w t->unit)                                \
  229                         a = t;                                          \
  230                 else                                                    \
  231                         break;                                          \
  232         }                                                               \
  233         if (a != NULL)                                                  \
  234                 CHN_INSERT_AFTER(a, y, z);                              \
  235         else                                                            \
  236                 CHN_INSERT_HEAD(x, y, z);                               \
  237 } while (0)
  238 
  239 #define CHN_INSERT_SORT_ASCEND(x, y, z)         CHN_INSERT_SORT(>, x, y, z)
  240 #define CHN_INSERT_SORT_DESCEND(x, y, z)        CHN_INSERT_SORT(<, x, y, z)
  241 
  242 #define CHN_UNIT(x)     (snd_unit2u((x)->unit))
  243 #define CHN_DEV(x)      (snd_unit2d((x)->unit))
  244 #define CHN_CHAN(x)     (snd_unit2c((x)->unit))
  245 
  246 #define CHN_BUF_PARENT(x, y)                                            \
  247         (((x) != NULL && (x)->parentchannel != NULL &&                  \
  248         (x)->parentchannel->bufhard != NULL) ?                          \
  249         (x)->parentchannel->bufhard : (y))
  250 
  251 #define CHN_BROADCAST(x)        do {                                    \
  252         if ((x)->cv_waiters != 0)                                       \
  253                 cv_broadcastpri(x, PRIBIO);                             \
  254 } while (0)
  255 
  256 #include "channel_if.h"
  257 
  258 int chn_reinit(struct pcm_channel *c);
  259 int chn_write(struct pcm_channel *c, struct uio *buf);
  260 int chn_read(struct pcm_channel *c, struct uio *buf);
  261 u_int32_t chn_start(struct pcm_channel *c, int force);
  262 int chn_sync(struct pcm_channel *c, int threshold);
  263 int chn_flush(struct pcm_channel *c);
  264 int chn_poll(struct pcm_channel *c, int ev, struct thread *td);
  265 
  266 int chn_init(struct pcm_channel *c, void *devinfo, int dir, int direction);
  267 int chn_kill(struct pcm_channel *c);
  268 int chn_reset(struct pcm_channel *c, u_int32_t fmt, u_int32_t spd);
  269 int chn_setvolume(struct pcm_channel *c, int left, int right);
  270 int chn_setvolume_multi(struct pcm_channel *c, int vc, int left, int right,
  271     int center);
  272 int chn_setvolume_matrix(struct pcm_channel *c, int vc, int vt, int val);
  273 int chn_getvolume_matrix(struct pcm_channel *c, int vc, int vt);
  274 void chn_vpc_reset(struct pcm_channel *c, int vc, int force);
  275 int chn_setparam(struct pcm_channel *c, uint32_t format, uint32_t speed);
  276 int chn_setspeed(struct pcm_channel *c, uint32_t speed);
  277 int chn_setformat(struct pcm_channel *c, uint32_t format);
  278 int chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz);
  279 int chn_setlatency(struct pcm_channel *c, int latency);
  280 void chn_syncstate(struct pcm_channel *c);
  281 int chn_trigger(struct pcm_channel *c, int go);
  282 int chn_getptr(struct pcm_channel *c);
  283 struct pcmchan_caps *chn_getcaps(struct pcm_channel *c);
  284 u_int32_t chn_getformats(struct pcm_channel *c);
  285 
  286 struct pcmchan_matrix *chn_getmatrix(struct pcm_channel *);
  287 int chn_setmatrix(struct pcm_channel *, struct pcmchan_matrix *);
  288 
  289 int chn_oss_getorder(struct pcm_channel *, unsigned long long *);
  290 int chn_oss_setorder(struct pcm_channel *, unsigned long long *);
  291 int chn_oss_getmask(struct pcm_channel *, uint32_t *);
  292 
  293 void chn_resetbuf(struct pcm_channel *c);
  294 void chn_intr_locked(struct pcm_channel *c);
  295 void chn_intr(struct pcm_channel *c);
  296 int chn_abort(struct pcm_channel *c);
  297 
  298 int chn_notify(struct pcm_channel *c, u_int32_t flags);
  299 
  300 int chn_getrates(struct pcm_channel *c, int **rates);
  301 int chn_syncdestroy(struct pcm_channel *c);
  302 
  303 #define CHN_SETVOLUME(...)              chn_setvolume_matrix(__VA_ARGS__)
  304 #if defined(SND_DIAGNOSTIC) || defined(INVARIANTS)
  305 #define CHN_GETVOLUME(...)              chn_getvolume_matrix(__VA_ARGS__)
  306 #else
  307 #define CHN_GETVOLUME(x, y, z)          ((x)->volume[y][z])
  308 #endif
  309 
  310 #ifdef OSSV4_EXPERIMENT
  311 int chn_getpeaks(struct pcm_channel *c, int *lpeak, int *rpeak);
  312 #endif
  313 
  314 #define CHN_LOCKOWNED(c)        mtx_owned((c)->lock)
  315 #define CHN_LOCK(c)             mtx_lock((c)->lock)
  316 #define CHN_UNLOCK(c)           mtx_unlock((c)->lock)
  317 #define CHN_TRYLOCK(c)          mtx_trylock((c)->lock)
  318 #define CHN_LOCKASSERT(c)       mtx_assert((c)->lock, MA_OWNED)
  319 #define CHN_UNLOCKASSERT(c)     mtx_assert((c)->lock, MA_NOTOWNED)
  320 
  321 int snd_fmtvalid(uint32_t fmt, uint32_t *fmtlist);
  322 
  323 uint32_t snd_str2afmt(const char *);
  324 uint32_t snd_afmt2str(uint32_t, char *, size_t);
  325 
  326 #define AFMTSTR_LEN     16
  327 
  328 
  329 extern int chn_latency;
  330 extern int chn_latency_profile;
  331 extern int report_soft_formats;
  332 extern int report_soft_matrix;
  333 
  334 #define PCMDIR_PLAY             1
  335 #define PCMDIR_PLAY_VIRTUAL     2
  336 #define PCMDIR_REC              -1
  337 #define PCMDIR_REC_VIRTUAL      -2
  338 
  339 #define PCMTRIG_START 1
  340 #define PCMTRIG_EMLDMAWR 2
  341 #define PCMTRIG_EMLDMARD 3
  342 #define PCMTRIG_STOP 0
  343 #define PCMTRIG_ABORT -1
  344 
  345 #define PCMTRIG_COMMON(x)       ((x) == PCMTRIG_START ||                \
  346                                  (x) == PCMTRIG_STOP ||                 \
  347                                  (x) == PCMTRIG_ABORT)
  348 
  349 #define CHN_F_CLOSING           0x00000001  /* a pending close */
  350 #define CHN_F_ABORTING          0x00000002  /* a pending abort */
  351 #define CHN_F_RUNNING           0x00000004  /* dma is running */
  352 #define CHN_F_TRIGGERED         0x00000008
  353 #define CHN_F_NOTRIGGER         0x00000010
  354 #define CHN_F_SLEEPING          0x00000020
  355 
  356 #define CHN_F_NBIO              0x00000040  /* do non-blocking i/o */
  357 #define CHN_F_MMAP              0x00000080  /* has been mmap()ed */
  358 
  359 #define CHN_F_BUSY              0x00000100  /* has been opened  */
  360 #define CHN_F_DIRTY             0x00000200  /* need re-config */
  361 #define CHN_F_DEAD              0x00000400  /* too many errors, dead, mdk */
  362 #define CHN_F_SILENCE           0x00000800  /* silence, nil, null, yada */
  363 
  364 #define CHN_F_HAS_SIZE          0x00001000  /* user set block size */
  365 #define CHN_F_HAS_VCHAN         0x00002000  /* vchan master */
  366 
  367 #define CHN_F_VCHAN_PASSTHROUGH 0x00004000  /* digital ac3/dts passthrough */
  368 #define CHN_F_VCHAN_ADAPTIVE    0x00008000  /* adaptive format/rate selection */
  369 #define CHN_F_VCHAN_DYNAMIC     (CHN_F_VCHAN_PASSTHROUGH | CHN_F_VCHAN_ADAPTIVE)
  370 
  371 #define CHN_F_VIRTUAL           0x10000000  /* not backed by hardware */
  372 #define CHN_F_BITPERFECT        0x20000000  /* un-cooked, Heh.. */
  373 #define CHN_F_PASSTHROUGH       0x40000000  /* passthrough re-config */
  374 #define CHN_F_EXCLUSIVE         0x80000000  /* exclusive access */
  375 
  376 #define CHN_F_BITS              "\020"                                  \
  377                                 "\001CLOSING"                           \
  378                                 "\002ABORTING"                          \
  379                                 "\003RUNNING"                           \
  380                                 "\004TRIGGERED"                         \
  381                                 "\005NOTRIGGER"                         \
  382                                 "\006SLEEPING"                          \
  383                                 "\007NBIO"                              \
  384                                 "\010MMAP"                              \
  385                                 "\011BUSY"                              \
  386                                 "\012DIRTY"                             \
  387                                 "\013DEAD"                              \
  388                                 "\014SILENCE"                           \
  389                                 "\015HAS_SIZE"                          \
  390                                 "\016HAS_VCHAN"                         \
  391                                 "\017VCHAN_PASSTHROUGH"                 \
  392                                 "\020VCHAN_ADAPTIVE"                    \
  393                                 "\035VIRTUAL"                           \
  394                                 "\036BITPERFECT"                        \
  395                                 "\037PASSTHROUGH"                       \
  396                                 "\040EXCLUSIVE"
  397 
  398 
  399 #define CHN_F_RESET             (CHN_F_BUSY | CHN_F_DEAD |              \
  400                                  CHN_F_VIRTUAL | CHN_F_HAS_VCHAN |      \
  401                                  CHN_F_VCHAN_DYNAMIC |                  \
  402                                  CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE)
  403 
  404 #define CHN_F_MMAP_INVALID      (CHN_F_DEAD | CHN_F_RUNNING)
  405 
  406                                         
  407 
  408 #define CHN_N_RATE              0x00000001
  409 #define CHN_N_FORMAT            0x00000002
  410 #define CHN_N_VOLUME            0x00000004
  411 #define CHN_N_BLOCKSIZE         0x00000008
  412 #define CHN_N_TRIGGER           0x00000010
  413 
  414 #define CHN_LATENCY_MIN         0
  415 #define CHN_LATENCY_MAX         10
  416 #define CHN_LATENCY_DEFAULT     2       /* 21.3ms total buffering */
  417 #define CHN_POLICY_MIN          CHN_LATENCY_MIN
  418 #define CHN_POLICY_MAX          CHN_LATENCY_MAX
  419 #define CHN_POLICY_DEFAULT      CHN_LATENCY_DEFAULT
  420 
  421 #define CHN_LATENCY_PROFILE_MIN         0
  422 #define CHN_LATENCY_PROFILE_MAX         1
  423 #define CHN_LATENCY_PROFILE_DEFAULT     CHN_LATENCY_PROFILE_MAX
  424 
  425 #define CHN_STARTED(c)          ((c)->flags & CHN_F_TRIGGERED)
  426 #define CHN_STOPPED(c)          (!CHN_STARTED(c))
  427 #define CHN_DIRSTR(c)           (((c)->direction == PCMDIR_PLAY) ? \
  428                                 "PCMDIR_PLAY" : "PCMDIR_REC")
  429 #define CHN_BITPERFECT(c)       ((c)->flags & CHN_F_BITPERFECT)
  430 #define CHN_PASSTHROUGH(c)      ((c)->flags & CHN_F_PASSTHROUGH)
  431 
  432 #define CHN_TIMEOUT             5
  433 #define CHN_TIMEOUT_MIN         1
  434 #define CHN_TIMEOUT_MAX         10
  435 
  436 /*
  437  * This should be large enough to hold all pcm data between
  438  * tsleeps in chn_{read,write} at the highest sample rate.
  439  * (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec)
  440  */
  441 #define CHN_2NDBUFBLKSIZE       (2 * 1024)
  442 /* The total number of blocks per secondary bufhard. */
  443 #define CHN_2NDBUFBLKNUM        (32)
  444 /* The size of a whole secondary bufhard. */
  445 #define CHN_2NDBUFMAXSIZE       (131072)
  446 
  447 #define CHANNEL_DECLARE(name) static DEFINE_CLASS(name, name ## _methods, sizeof(struct kobj))

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