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/8.1/sys/dev/sound/pcm/channel.h 193979 2009-06-11 09:06:09Z ariff $
   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 
  166         int volume[SND_VOL_C_MAX][SND_CHN_T_VOL_MAX];
  167 
  168         void *data1, *data2;
  169 };
  170 
  171 #define CHN_HEAD(x, y)                  &(x)->y.head
  172 #define CHN_INIT(x, y)                  SLIST_INIT(CHN_HEAD(x, y))
  173 #define CHN_LINK(y)                     y.link
  174 #define CHN_EMPTY(x, y)                 SLIST_EMPTY(CHN_HEAD(x, y))
  175 #define CHN_FIRST(x, y)                 SLIST_FIRST(CHN_HEAD(x, y))
  176 
  177 #define CHN_FOREACH(x, y, z)                                            \
  178         SLIST_FOREACH(x, CHN_HEAD(y, z), CHN_LINK(z))
  179 
  180 #define CHN_FOREACH_SAFE(w, x, y, z)                                    \
  181         SLIST_FOREACH_SAFE(w, CHN_HEAD(x, z), CHN_LINK(z), y)
  182 
  183 #define CHN_INSERT_HEAD(x, y, z)                                        \
  184         SLIST_INSERT_HEAD(CHN_HEAD(x, z), y, CHN_LINK(z))
  185 
  186 #define CHN_INSERT_AFTER(x, y, z)                                       \
  187         SLIST_INSERT_AFTER(x, y, CHN_LINK(z))
  188 
  189 #define CHN_REMOVE(x, y, z)                                             \
  190         SLIST_REMOVE(CHN_HEAD(x, z), y, pcm_channel, CHN_LINK(z))
  191 
  192 #define CHN_INSERT_HEAD_SAFE(x, y, z)           do {                    \
  193         struct pcm_channel *t = NULL;                                   \
  194         CHN_FOREACH(t, x, z) {                                          \
  195                 if (t == y)                                             \
  196                         break;                                          \
  197         }                                                               \
  198         if (t != y)                                                     \
  199                 CHN_INSERT_HEAD(x, y, z);                               \
  200 } while (0)
  201 
  202 #define CHN_INSERT_AFTER_SAFE(w, x, y, z)       do {                    \
  203         struct pcm_channel *t = NULL;                                   \
  204         CHN_FOREACH(t, w, z) {                                          \
  205                 if (t == y)                                             \
  206                         break;                                          \
  207         }                                                               \
  208         if (t != y)                                                     \
  209                 CHN_INSERT_AFTER(x, y, z);                              \
  210 } while (0)
  211 
  212 #define CHN_REMOVE_SAFE(x, y, z)                do {                    \
  213         struct pcm_channel *t = NULL;                                   \
  214         CHN_FOREACH(t, x, z) {                                          \
  215                 if (t == y)                                             \
  216                         break;                                          \
  217         }                                                               \
  218         if (t == y)                                                     \
  219                 CHN_REMOVE(x, y, z);                                    \
  220 } while (0)
  221 
  222 #define CHN_INSERT_SORT(w, x, y, z)             do {                    \
  223         struct pcm_channel *t, *a = NULL;                               \
  224         CHN_FOREACH(t, x, z) {                                          \
  225                 if ((y)->unit w t->unit)                                \
  226                         a = t;                                          \
  227                 else                                                    \
  228                         break;                                          \
  229         }                                                               \
  230         if (a != NULL)                                                  \
  231                 CHN_INSERT_AFTER(a, y, z);                              \
  232         else                                                            \
  233                 CHN_INSERT_HEAD(x, y, z);                               \
  234 } while (0)
  235 
  236 #define CHN_INSERT_SORT_ASCEND(x, y, z)         CHN_INSERT_SORT(>, x, y, z)
  237 #define CHN_INSERT_SORT_DESCEND(x, y, z)        CHN_INSERT_SORT(<, x, y, z)
  238 
  239 #define CHN_UNIT(x)     (snd_unit2u((x)->unit))
  240 #define CHN_DEV(x)      (snd_unit2d((x)->unit))
  241 #define CHN_CHAN(x)     (snd_unit2c((x)->unit))
  242 
  243 #define CHN_BUF_PARENT(x, y)                                            \
  244         (((x) != NULL && (x)->parentchannel != NULL &&                  \
  245         (x)->parentchannel->bufhard != NULL) ?                          \
  246         (x)->parentchannel->bufhard : (y))
  247 
  248 #define CHN_BROADCAST(x)        do {                                    \
  249         if ((x)->cv_waiters != 0)                                       \
  250                 cv_broadcastpri(x, PRIBIO);                             \
  251 } while (0)
  252 
  253 #include "channel_if.h"
  254 
  255 int chn_reinit(struct pcm_channel *c);
  256 int chn_write(struct pcm_channel *c, struct uio *buf);
  257 int chn_read(struct pcm_channel *c, struct uio *buf);
  258 u_int32_t chn_start(struct pcm_channel *c, int force);
  259 int chn_sync(struct pcm_channel *c, int threshold);
  260 int chn_flush(struct pcm_channel *c);
  261 int chn_poll(struct pcm_channel *c, int ev, struct thread *td);
  262 
  263 int chn_init(struct pcm_channel *c, void *devinfo, int dir, int direction);
  264 int chn_kill(struct pcm_channel *c);
  265 int chn_reset(struct pcm_channel *c, u_int32_t fmt, u_int32_t spd);
  266 int chn_setvolume(struct pcm_channel *c, int left, int right);
  267 int chn_setvolume_multi(struct pcm_channel *c, int vc, int left, int right,
  268     int center);
  269 int chn_setvolume_matrix(struct pcm_channel *c, int vc, int vt, int val);
  270 int chn_getvolume_matrix(struct pcm_channel *c, int vc, int vt);
  271 void chn_vpc_reset(struct pcm_channel *c, int vc, int force);
  272 int chn_setparam(struct pcm_channel *c, uint32_t format, uint32_t speed);
  273 int chn_setspeed(struct pcm_channel *c, uint32_t speed);
  274 int chn_setformat(struct pcm_channel *c, uint32_t format);
  275 int chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz);
  276 int chn_setlatency(struct pcm_channel *c, int latency);
  277 void chn_syncstate(struct pcm_channel *c);
  278 int chn_trigger(struct pcm_channel *c, int go);
  279 int chn_getptr(struct pcm_channel *c);
  280 struct pcmchan_caps *chn_getcaps(struct pcm_channel *c);
  281 u_int32_t chn_getformats(struct pcm_channel *c);
  282 
  283 struct pcmchan_matrix *chn_getmatrix(struct pcm_channel *);
  284 int chn_setmatrix(struct pcm_channel *, struct pcmchan_matrix *);
  285 
  286 int chn_oss_getorder(struct pcm_channel *, unsigned long long *);
  287 int chn_oss_setorder(struct pcm_channel *, unsigned long long *);
  288 int chn_oss_getmask(struct pcm_channel *, uint32_t *);
  289 
  290 void chn_resetbuf(struct pcm_channel *c);
  291 void chn_intr_locked(struct pcm_channel *c);
  292 void chn_intr(struct pcm_channel *c);
  293 int chn_abort(struct pcm_channel *c);
  294 
  295 int chn_notify(struct pcm_channel *c, u_int32_t flags);
  296 
  297 int chn_getrates(struct pcm_channel *c, int **rates);
  298 int chn_syncdestroy(struct pcm_channel *c);
  299 
  300 #define CHN_SETVOLUME(...)              chn_setvolume_matrix(__VA_ARGS__)
  301 #if defined(SND_DIAGNOSTIC) || defined(INVARIANTS)
  302 #define CHN_GETVOLUME(...)              chn_getvolume_matrix(__VA_ARGS__)
  303 #else
  304 #define CHN_GETVOLUME(x, y, z)          ((x)->volume[y][z])
  305 #endif
  306 
  307 #ifdef OSSV4_EXPERIMENT
  308 int chn_getpeaks(struct pcm_channel *c, int *lpeak, int *rpeak);
  309 #endif
  310 
  311 #define CHN_LOCKOWNED(c)        mtx_owned((c)->lock)
  312 #define CHN_LOCK(c)             mtx_lock((c)->lock)
  313 #define CHN_UNLOCK(c)           mtx_unlock((c)->lock)
  314 #define CHN_TRYLOCK(c)          mtx_trylock((c)->lock)
  315 #define CHN_LOCKASSERT(c)       mtx_assert((c)->lock, MA_OWNED)
  316 #define CHN_UNLOCKASSERT(c)     mtx_assert((c)->lock, MA_NOTOWNED)
  317 
  318 int snd_fmtvalid(uint32_t fmt, uint32_t *fmtlist);
  319 
  320 uint32_t snd_str2afmt(const char *);
  321 uint32_t snd_afmt2str(uint32_t, char *, size_t);
  322 
  323 #define AFMTSTR_LEN     16
  324 
  325 
  326 extern int chn_latency;
  327 extern int chn_latency_profile;
  328 extern int report_soft_formats;
  329 extern int report_soft_matrix;
  330 
  331 #define PCMDIR_PLAY             1
  332 #define PCMDIR_PLAY_VIRTUAL     2
  333 #define PCMDIR_REC              -1
  334 #define PCMDIR_REC_VIRTUAL      -2
  335 
  336 #define PCMTRIG_START 1
  337 #define PCMTRIG_EMLDMAWR 2
  338 #define PCMTRIG_EMLDMARD 3
  339 #define PCMTRIG_STOP 0
  340 #define PCMTRIG_ABORT -1
  341 
  342 #define PCMTRIG_COMMON(x)       ((x) == PCMTRIG_START ||                \
  343                                  (x) == PCMTRIG_STOP ||                 \
  344                                  (x) == PCMTRIG_ABORT)
  345 
  346 #define CHN_F_CLOSING           0x00000001  /* a pending close */
  347 #define CHN_F_ABORTING          0x00000002  /* a pending abort */
  348 #define CHN_F_RUNNING           0x00000004  /* dma is running */
  349 #define CHN_F_TRIGGERED         0x00000008
  350 #define CHN_F_NOTRIGGER         0x00000010
  351 #define CHN_F_SLEEPING          0x00000020
  352 
  353 #define CHN_F_NBIO              0x00000040  /* do non-blocking i/o */
  354 #define CHN_F_MMAP              0x00000080  /* has been mmap()ed */
  355 
  356 #define CHN_F_BUSY              0x00000100  /* has been opened  */
  357 #define CHN_F_DIRTY             0x00000200  /* need re-config */
  358 #define CHN_F_DEAD              0x00000400  /* too many errors, dead, mdk */
  359 #define CHN_F_SILENCE           0x00000800  /* silence, nil, null, yada */
  360 
  361 #define CHN_F_HAS_SIZE          0x00001000  /* user set block size */
  362 #define CHN_F_HAS_VCHAN         0x00002000  /* vchan master */
  363 
  364 #define CHN_F_VCHAN_PASSTHROUGH 0x00004000  /* digital ac3/dts passthrough */
  365 #define CHN_F_VCHAN_ADAPTIVE    0x00008000  /* adaptive format/rate selection */
  366 #define CHN_F_VCHAN_DYNAMIC     (CHN_F_VCHAN_PASSTHROUGH | CHN_F_VCHAN_ADAPTIVE)
  367 
  368 #define CHN_F_VIRTUAL           0x10000000  /* not backed by hardware */
  369 #define CHN_F_BITPERFECT        0x20000000  /* un-cooked, Heh.. */
  370 #define CHN_F_PASSTHROUGH       0x40000000  /* passthrough re-config */
  371 #define CHN_F_EXCLUSIVE         0x80000000  /* exclusive access */
  372 
  373 #define CHN_F_BITS              "\020"                                  \
  374                                 "\001CLOSING"                           \
  375                                 "\002ABORTING"                          \
  376                                 "\003RUNNING"                           \
  377                                 "\004TRIGGERED"                         \
  378                                 "\005NOTRIGGER"                         \
  379                                 "\006SLEEPING"                          \
  380                                 "\007NBIO"                              \
  381                                 "\010MMAP"                              \
  382                                 "\011BUSY"                              \
  383                                 "\012DIRTY"                             \
  384                                 "\013DEAD"                              \
  385                                 "\014SILENCE"                           \
  386                                 "\015HAS_SIZE"                          \
  387                                 "\016HAS_VCHAN"                         \
  388                                 "\017VCHAN_PASSTHROUGH"                 \
  389                                 "\020VCHAN_ADAPTIVE"                    \
  390                                 "\035VIRTUAL"                           \
  391                                 "\036BITPERFECT"                        \
  392                                 "\037PASSTHROUGH"                       \
  393                                 "\040EXCLUSIVE"
  394 
  395 
  396 #define CHN_F_RESET             (CHN_F_BUSY | CHN_F_DEAD |              \
  397                                  CHN_F_VIRTUAL | CHN_F_HAS_VCHAN |      \
  398                                  CHN_F_VCHAN_DYNAMIC |                  \
  399                                  CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE)
  400 
  401 #define CHN_F_MMAP_INVALID      (CHN_F_DEAD | CHN_F_RUNNING)
  402 
  403                                         
  404 
  405 #define CHN_N_RATE              0x00000001
  406 #define CHN_N_FORMAT            0x00000002
  407 #define CHN_N_VOLUME            0x00000004
  408 #define CHN_N_BLOCKSIZE         0x00000008
  409 #define CHN_N_TRIGGER           0x00000010
  410 
  411 #define CHN_LATENCY_MIN         0
  412 #define CHN_LATENCY_MAX         10
  413 #define CHN_LATENCY_DEFAULT     5
  414 #define CHN_POLICY_MIN          CHN_LATENCY_MIN
  415 #define CHN_POLICY_MAX          CHN_LATENCY_MAX
  416 #define CHN_POLICY_DEFAULT      CHN_LATENCY_DEFAULT
  417 
  418 #define CHN_LATENCY_PROFILE_MIN         0
  419 #define CHN_LATENCY_PROFILE_MAX         1
  420 #define CHN_LATENCY_PROFILE_DEFAULT     CHN_LATENCY_PROFILE_MAX
  421 
  422 #define CHN_STARTED(c)          ((c)->flags & CHN_F_TRIGGERED)
  423 #define CHN_STOPPED(c)          (!CHN_STARTED(c))
  424 #define CHN_DIRSTR(c)           (((c)->direction == PCMDIR_PLAY) ? \
  425                                 "PCMDIR_PLAY" : "PCMDIR_REC")
  426 #define CHN_BITPERFECT(c)       ((c)->flags & CHN_F_BITPERFECT)
  427 #define CHN_PASSTHROUGH(c)      ((c)->flags & CHN_F_PASSTHROUGH)
  428 
  429 #define CHN_TIMEOUT             5
  430 #define CHN_TIMEOUT_MIN         1
  431 #define CHN_TIMEOUT_MAX         10
  432 
  433 /*
  434  * This should be large enough to hold all pcm data between
  435  * tsleeps in chn_{read,write} at the highest sample rate.
  436  * (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec)
  437  */
  438 #define CHN_2NDBUFBLKSIZE       (2 * 1024)
  439 /* The total number of blocks per secondary bufhard. */
  440 #define CHN_2NDBUFBLKNUM        (32)
  441 /* The size of a whole secondary bufhard. */
  442 #define CHN_2NDBUFMAXSIZE       (131072)
  443 
  444 #define CHANNEL_DECLARE(name) static DEFINE_CLASS(name, name ## _methods, sizeof(struct kobj))

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