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  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    3  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
    4  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/10.4/sys/dev/sound/pcm/channel.h 283950 2015-06-03 15:32:43Z hselasky $
   29  */
   30 
   31 struct pcmchan_caps {
   32         u_int32_t minspeed, maxspeed;
   33         u_int32_t *fmtlist;
   34         u_int32_t caps;
   35 };
   36 
   37 struct pcmchan_matrix {
   38         int id;
   39         uint8_t channels, ext;
   40         struct {
   41                 int type;
   42                 uint32_t members;
   43         } map[SND_CHN_T_MAX + 1];
   44         uint32_t mask;
   45         int8_t offset[SND_CHN_T_MAX];
   46 };
   47 
   48 /* Forward declarations */
   49 struct pcm_channel;
   50 struct pcmchan_syncgroup;
   51 struct pcmchan_syncmember;
   52 
   53 extern struct mtx snd_pcm_syncgroups_mtx;
   54 extern SLIST_HEAD(pcm_synclist, pcmchan_syncgroup) snd_pcm_syncgroups;
   55 
   56 #define PCM_SG_LOCK()       mtx_lock(&snd_pcm_syncgroups_mtx)
   57 #define PCM_SG_TRYLOCK()    mtx_trylock(&snd_pcm_syncgroups_mtx)
   58 #define PCM_SG_UNLOCK()     mtx_unlock(&snd_pcm_syncgroups_mtx)
   59 #define PCM_SG_LOCKASSERT(arg)  mtx_assert(&snd_pcm_syncgroups_mtx, arg)
   60 
   61 /**
   62  * @brief Specifies an audio device sync group
   63  */
   64 struct pcmchan_syncgroup {
   65         SLIST_ENTRY(pcmchan_syncgroup) link;
   66         SLIST_HEAD(, pcmchan_syncmember) members;
   67         int id; /**< Group identifier; set to address of group. */
   68 };
   69 
   70 /**
   71  * @brief Specifies a container for members of a sync group
   72  */
   73 struct pcmchan_syncmember {
   74         SLIST_ENTRY(pcmchan_syncmember) link;
   75         struct pcmchan_syncgroup *parent; /**< group head */
   76         struct pcm_channel *ch;
   77 };
   78 
   79 #define CHN_NAMELEN             32
   80 #define CHN_COMM_UNUSED         "<UNUSED>"
   81 #define CHN_COMM_UNKNOWN        "<UNKNOWN>"
   82 
   83 struct pcm_channel {
   84         kobj_t methods;
   85 
   86         pid_t pid;
   87         int refcount;
   88         struct pcm_feeder *feeder;
   89         u_int32_t align;
   90 
   91         int latency;
   92         u_int32_t speed;
   93         u_int32_t format;
   94         u_int32_t flags;
   95         u_int32_t feederflags;
   96         u_int64_t blocks;
   97 
   98         int direction;
   99         unsigned int interrupts, xruns, feedcount;
  100         unsigned int timeout;
  101         struct snd_dbuf *bufhard, *bufsoft;
  102         struct snddev_info *parentsnddev;
  103         struct pcm_channel *parentchannel;
  104         void *devinfo;
  105         device_t dev;
  106         int unit;
  107         char name[CHN_NAMELEN];
  108         char comm[MAXCOMLEN + 1];
  109         struct mtx *lock;
  110         int trigger;
  111         /**
  112          * For interrupt manipulations.
  113          */
  114         struct cv intr_cv;
  115         /**
  116          * Increment,decrement this around operations that temporarily yield
  117          * lock.
  118          */
  119         unsigned int inprog;
  120         /**
  121          * Special channel operations should examine @c inprog after acquiring
  122          * lock.  If zero, operations may continue.  Else, thread should
  123          * wait on this cv for previous operation to finish.
  124          */
  125         struct cv cv;
  126         /**
  127          * Low water mark for select()/poll().
  128          *
  129          * This is initialized to the channel's fragment size, and will be
  130          * overwritten if a new fragment size is set.  Users may alter this
  131          * value directly with the @c SNDCTL_DSP_LOW_WATER ioctl.
  132          */
  133         unsigned int lw;
  134         /**
  135          * If part of a sync group, this will point to the syncmember
  136          * container.
  137          */
  138         struct pcmchan_syncmember *sm;
  139 #ifdef OSSV4_EXPERIMENT
  140         u_int16_t lpeak, rpeak; /**< Peak value from 0-32767. */
  141 #endif
  142 
  143         struct {
  144                 SLIST_HEAD(, pcm_channel) head;
  145                 SLIST_ENTRY(pcm_channel) link;
  146                 struct {
  147                         SLIST_HEAD(, pcm_channel) head;
  148                         SLIST_ENTRY(pcm_channel) link;
  149                 } busy;
  150         } children;
  151 
  152         struct {
  153                 struct {
  154                         SLIST_ENTRY(pcm_channel) link;
  155                         struct {
  156                                 SLIST_ENTRY(pcm_channel) link;
  157                         } busy;
  158                         struct {
  159                                 SLIST_ENTRY(pcm_channel) link;
  160                         } opened;
  161                 } pcm;
  162         } channels;
  163 
  164         struct pcmchan_matrix matrix;
  165         struct pcmchan_matrix matrix_scratch;
  166 
  167         int volume[SND_VOL_C_MAX][SND_CHN_T_VOL_MAX];
  168 
  169         void *data1, *data2;
  170 };
  171 
  172 #define CHN_HEAD(x, y)                  &(x)->y.head
  173 #define CHN_INIT(x, y)                  SLIST_INIT(CHN_HEAD(x, y))
  174 #define CHN_LINK(y)                     y.link
  175 #define CHN_EMPTY(x, y)                 SLIST_EMPTY(CHN_HEAD(x, y))
  176 #define CHN_FIRST(x, y)                 SLIST_FIRST(CHN_HEAD(x, y))
  177 
  178 #define CHN_FOREACH(x, y, z)                                            \
  179         SLIST_FOREACH(x, CHN_HEAD(y, z), CHN_LINK(z))
  180 
  181 #define CHN_FOREACH_SAFE(w, x, y, z)                                    \
  182         SLIST_FOREACH_SAFE(w, CHN_HEAD(x, z), CHN_LINK(z), y)
  183 
  184 #define CHN_INSERT_HEAD(x, y, z)                                        \
  185         SLIST_INSERT_HEAD(CHN_HEAD(x, z), y, CHN_LINK(z))
  186 
  187 #define CHN_INSERT_AFTER(x, y, z)                                       \
  188         SLIST_INSERT_AFTER(x, y, CHN_LINK(z))
  189 
  190 #define CHN_REMOVE(x, y, z)                                             \
  191         SLIST_REMOVE(CHN_HEAD(x, z), y, pcm_channel, CHN_LINK(z))
  192 
  193 #define CHN_INSERT_HEAD_SAFE(x, y, z)           do {                    \
  194         struct pcm_channel *t = NULL;                                   \
  195         CHN_FOREACH(t, x, z) {                                          \
  196                 if (t == y)                                             \
  197                         break;                                          \
  198         }                                                               \
  199         if (t != y)                                                     \
  200                 CHN_INSERT_HEAD(x, y, z);                               \
  201 } while (0)
  202 
  203 #define CHN_INSERT_AFTER_SAFE(w, x, y, z)       do {                    \
  204         struct pcm_channel *t = NULL;                                   \
  205         CHN_FOREACH(t, w, z) {                                          \
  206                 if (t == y)                                             \
  207                         break;                                          \
  208         }                                                               \
  209         if (t != y)                                                     \
  210                 CHN_INSERT_AFTER(x, y, z);                              \
  211 } while (0)
  212 
  213 #define CHN_REMOVE_SAFE(x, y, z)                do {                    \
  214         struct pcm_channel *t = NULL;                                   \
  215         CHN_FOREACH(t, x, z) {                                          \
  216                 if (t == y)                                             \
  217                         break;                                          \
  218         }                                                               \
  219         if (t == y)                                                     \
  220                 CHN_REMOVE(x, y, z);                                    \
  221 } while (0)
  222 
  223 #define CHN_INSERT_SORT(w, x, y, z)             do {                    \
  224         struct pcm_channel *t, *a = NULL;                               \
  225         CHN_FOREACH(t, x, z) {                                          \
  226                 if ((y)->unit w t->unit)                                \
  227                         a = t;                                          \
  228                 else                                                    \
  229                         break;                                          \
  230         }                                                               \
  231         if (a != NULL)                                                  \
  232                 CHN_INSERT_AFTER(a, y, z);                              \
  233         else                                                            \
  234                 CHN_INSERT_HEAD(x, y, z);                               \
  235 } while (0)
  236 
  237 #define CHN_INSERT_SORT_ASCEND(x, y, z)         CHN_INSERT_SORT(>, x, y, z)
  238 #define CHN_INSERT_SORT_DESCEND(x, y, z)        CHN_INSERT_SORT(<, x, y, z)
  239 
  240 #define CHN_UNIT(x)     (snd_unit2u((x)->unit))
  241 #define CHN_DEV(x)      (snd_unit2d((x)->unit))
  242 #define CHN_CHAN(x)     (snd_unit2c((x)->unit))
  243 
  244 #define CHN_BUF_PARENT(x, y)                                            \
  245         (((x) != NULL && (x)->parentchannel != NULL &&                  \
  246         (x)->parentchannel->bufhard != NULL) ?                          \
  247         (x)->parentchannel->bufhard : (y))
  248 
  249 #define CHN_BROADCAST(x)        do {                                    \
  250         if ((x)->cv_waiters != 0)                                       \
  251                 cv_broadcastpri(x, PRIBIO);                             \
  252 } while (0)
  253 
  254 #include "channel_if.h"
  255 
  256 int chn_reinit(struct pcm_channel *c);
  257 int chn_write(struct pcm_channel *c, struct uio *buf);
  258 int chn_read(struct pcm_channel *c, struct uio *buf);
  259 u_int32_t chn_start(struct pcm_channel *c, int force);
  260 int chn_sync(struct pcm_channel *c, int threshold);
  261 int chn_flush(struct pcm_channel *c);
  262 int chn_poll(struct pcm_channel *c, int ev, struct thread *td);
  263 
  264 int chn_init(struct pcm_channel *c, void *devinfo, int dir, int direction);
  265 int chn_kill(struct pcm_channel *c);
  266 int chn_reset(struct pcm_channel *c, u_int32_t fmt, u_int32_t spd);
  267 int chn_setvolume(struct pcm_channel *c, int left, int right);
  268 int chn_setvolume_multi(struct pcm_channel *c, int vc, int left, int right,
  269     int center);
  270 int chn_setvolume_matrix(struct pcm_channel *c, int vc, int vt, int val);
  271 int chn_getvolume_matrix(struct pcm_channel *c, int vc, int vt);
  272 void chn_vpc_reset(struct pcm_channel *c, int vc, int force);
  273 int chn_setparam(struct pcm_channel *c, uint32_t format, uint32_t speed);
  274 int chn_setspeed(struct pcm_channel *c, uint32_t speed);
  275 int chn_setformat(struct pcm_channel *c, uint32_t format);
  276 int chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz);
  277 int chn_setlatency(struct pcm_channel *c, int latency);
  278 void chn_syncstate(struct pcm_channel *c);
  279 int chn_trigger(struct pcm_channel *c, int go);
  280 int chn_getptr(struct pcm_channel *c);
  281 struct pcmchan_caps *chn_getcaps(struct pcm_channel *c);
  282 u_int32_t chn_getformats(struct pcm_channel *c);
  283 
  284 struct pcmchan_matrix *chn_getmatrix(struct pcm_channel *);
  285 int chn_setmatrix(struct pcm_channel *, struct pcmchan_matrix *);
  286 
  287 int chn_oss_getorder(struct pcm_channel *, unsigned long long *);
  288 int chn_oss_setorder(struct pcm_channel *, unsigned long long *);
  289 int chn_oss_getmask(struct pcm_channel *, uint32_t *);
  290 
  291 void chn_resetbuf(struct pcm_channel *c);
  292 void chn_intr_locked(struct pcm_channel *c);
  293 void chn_intr(struct pcm_channel *c);
  294 int chn_abort(struct pcm_channel *c);
  295 
  296 int chn_notify(struct pcm_channel *c, u_int32_t flags);
  297 
  298 int chn_getrates(struct pcm_channel *c, int **rates);
  299 int chn_syncdestroy(struct pcm_channel *c);
  300 
  301 #define CHN_SETVOLUME(...)              chn_setvolume_matrix(__VA_ARGS__)
  302 #if defined(SND_DIAGNOSTIC) || defined(INVARIANTS)
  303 #define CHN_GETVOLUME(...)              chn_getvolume_matrix(__VA_ARGS__)
  304 #else
  305 #define CHN_GETVOLUME(x, y, z)          ((x)->volume[y][z])
  306 #endif
  307 
  308 #ifdef OSSV4_EXPERIMENT
  309 int chn_getpeaks(struct pcm_channel *c, int *lpeak, int *rpeak);
  310 #endif
  311 
  312 #define CHN_LOCKOWNED(c)        mtx_owned((c)->lock)
  313 #define CHN_LOCK(c)             mtx_lock((c)->lock)
  314 #define CHN_UNLOCK(c)           mtx_unlock((c)->lock)
  315 #define CHN_TRYLOCK(c)          mtx_trylock((c)->lock)
  316 #define CHN_LOCKASSERT(c)       mtx_assert((c)->lock, MA_OWNED)
  317 #define CHN_UNLOCKASSERT(c)     mtx_assert((c)->lock, MA_NOTOWNED)
  318 
  319 int snd_fmtvalid(uint32_t fmt, uint32_t *fmtlist);
  320 
  321 uint32_t snd_str2afmt(const char *);
  322 uint32_t snd_afmt2str(uint32_t, char *, size_t);
  323 
  324 #define AFMTSTR_LEN     16
  325 
  326 
  327 extern int chn_latency;
  328 extern int chn_latency_profile;
  329 extern int report_soft_formats;
  330 extern int report_soft_matrix;
  331 
  332 #define PCMDIR_PLAY             1
  333 #define PCMDIR_PLAY_VIRTUAL     2
  334 #define PCMDIR_REC              -1
  335 #define PCMDIR_REC_VIRTUAL      -2
  336 
  337 #define PCMTRIG_START 1
  338 #define PCMTRIG_EMLDMAWR 2
  339 #define PCMTRIG_EMLDMARD 3
  340 #define PCMTRIG_STOP 0
  341 #define PCMTRIG_ABORT -1
  342 
  343 #define PCMTRIG_COMMON(x)       ((x) == PCMTRIG_START ||                \
  344                                  (x) == PCMTRIG_STOP ||                 \
  345                                  (x) == PCMTRIG_ABORT)
  346 
  347 #define CHN_F_CLOSING           0x00000001  /* a pending close */
  348 #define CHN_F_ABORTING          0x00000002  /* a pending abort */
  349 #define CHN_F_RUNNING           0x00000004  /* dma is running */
  350 #define CHN_F_TRIGGERED         0x00000008
  351 #define CHN_F_NOTRIGGER         0x00000010
  352 #define CHN_F_SLEEPING          0x00000020
  353 
  354 #define CHN_F_NBIO              0x00000040  /* do non-blocking i/o */
  355 #define CHN_F_MMAP              0x00000080  /* has been mmap()ed */
  356 
  357 #define CHN_F_BUSY              0x00000100  /* has been opened  */
  358 #define CHN_F_DIRTY             0x00000200  /* need re-config */
  359 #define CHN_F_DEAD              0x00000400  /* too many errors, dead, mdk */
  360 #define CHN_F_SILENCE           0x00000800  /* silence, nil, null, yada */
  361 
  362 #define CHN_F_HAS_SIZE          0x00001000  /* user set block size */
  363 #define CHN_F_HAS_VCHAN         0x00002000  /* vchan master */
  364 
  365 #define CHN_F_VCHAN_PASSTHROUGH 0x00004000  /* digital ac3/dts passthrough */
  366 #define CHN_F_VCHAN_ADAPTIVE    0x00008000  /* adaptive format/rate selection */
  367 #define CHN_F_VCHAN_DYNAMIC     (CHN_F_VCHAN_PASSTHROUGH | CHN_F_VCHAN_ADAPTIVE)
  368 
  369 #define CHN_F_VIRTUAL           0x10000000  /* not backed by hardware */
  370 #define CHN_F_BITPERFECT        0x20000000  /* un-cooked, Heh.. */
  371 #define CHN_F_PASSTHROUGH       0x40000000  /* passthrough re-config */
  372 #define CHN_F_EXCLUSIVE         0x80000000  /* exclusive access */
  373 
  374 #define CHN_F_BITS              "\020"                                  \
  375                                 "\001CLOSING"                           \
  376                                 "\002ABORTING"                          \
  377                                 "\003RUNNING"                           \
  378                                 "\004TRIGGERED"                         \
  379                                 "\005NOTRIGGER"                         \
  380                                 "\006SLEEPING"                          \
  381                                 "\007NBIO"                              \
  382                                 "\010MMAP"                              \
  383                                 "\011BUSY"                              \
  384                                 "\012DIRTY"                             \
  385                                 "\013DEAD"                              \
  386                                 "\014SILENCE"                           \
  387                                 "\015HAS_SIZE"                          \
  388                                 "\016HAS_VCHAN"                         \
  389                                 "\017VCHAN_PASSTHROUGH"                 \
  390                                 "\020VCHAN_ADAPTIVE"                    \
  391                                 "\035VIRTUAL"                           \
  392                                 "\036BITPERFECT"                        \
  393                                 "\037PASSTHROUGH"                       \
  394                                 "\040EXCLUSIVE"
  395 
  396 
  397 #define CHN_F_RESET             (CHN_F_BUSY | CHN_F_DEAD |              \
  398                                  CHN_F_VIRTUAL | CHN_F_HAS_VCHAN |      \
  399                                  CHN_F_VCHAN_DYNAMIC |                  \
  400                                  CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE)
  401 
  402 #define CHN_F_MMAP_INVALID      (CHN_F_DEAD | CHN_F_RUNNING)
  403 
  404                                         
  405 
  406 #define CHN_N_RATE              0x00000001
  407 #define CHN_N_FORMAT            0x00000002
  408 #define CHN_N_VOLUME            0x00000004
  409 #define CHN_N_BLOCKSIZE         0x00000008
  410 #define CHN_N_TRIGGER           0x00000010
  411 
  412 #define CHN_LATENCY_MIN         0
  413 #define CHN_LATENCY_MAX         10
  414 #define CHN_LATENCY_DEFAULT     5
  415 #define CHN_POLICY_MIN          CHN_LATENCY_MIN
  416 #define CHN_POLICY_MAX          CHN_LATENCY_MAX
  417 #define CHN_POLICY_DEFAULT      CHN_LATENCY_DEFAULT
  418 
  419 #define CHN_LATENCY_PROFILE_MIN         0
  420 #define CHN_LATENCY_PROFILE_MAX         1
  421 #define CHN_LATENCY_PROFILE_DEFAULT     CHN_LATENCY_PROFILE_MAX
  422 
  423 #define CHN_STARTED(c)          ((c)->flags & CHN_F_TRIGGERED)
  424 #define CHN_STOPPED(c)          (!CHN_STARTED(c))
  425 #define CHN_DIRSTR(c)           (((c)->direction == PCMDIR_PLAY) ? \
  426                                 "PCMDIR_PLAY" : "PCMDIR_REC")
  427 #define CHN_BITPERFECT(c)       ((c)->flags & CHN_F_BITPERFECT)
  428 #define CHN_PASSTHROUGH(c)      ((c)->flags & CHN_F_PASSTHROUGH)
  429 
  430 #define CHN_TIMEOUT             5
  431 #define CHN_TIMEOUT_MIN         1
  432 #define CHN_TIMEOUT_MAX         10
  433 
  434 /*
  435  * This should be large enough to hold all pcm data between
  436  * tsleeps in chn_{read,write} at the highest sample rate.
  437  * (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec)
  438  */
  439 #define CHN_2NDBUFBLKSIZE       (2 * 1024)
  440 /* The total number of blocks per secondary bufhard. */
  441 #define CHN_2NDBUFBLKNUM        (32)
  442 /* The size of a whole secondary bufhard. */
  443 #define CHN_2NDBUFMAXSIZE       (131072)
  444 
  445 #define CHANNEL_DECLARE(name) static DEFINE_CLASS(name, name ## _methods, sizeof(struct kobj))

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