sound/pcm/mixer.c

38 SND_DECLARE_FILE("$FreeBSD: releng/10.2/sys/dev/sound/pcm/mixer.c 271193 2014-09-06 15:24:48Z mav $");
40 static MALLOC_DEFINE(M_MIXER, "mixer", "mixer");
46     "control channel pcm/rec volume, bypassing real mixer device");
71 	 * mixer's controls.  A change in value indicates that persistent
72 	 * mixer applications should update their displays.
106 	.d_name =	"mixer",
110  * Keeps a count of mixer devices; used only by OSSv4 SNDCTL_SYSINFO ioctl.
331 mixer_get(struct snd_mixer *mixer, int dev)
333 	if ((dev < SOUND_MIXER_NRDEVICES) && (mixer->devs & (1 << dev)))
334 		return mixer->level[dev];
340 mixer_setrecsrc(struct snd_mixer *mixer, u_int32_t src)
346 	d = device_get_softc(mixer->dev);
349 	if (!(d->flags & SD_F_MPSAFE) && mtx_owned(mixer->lock) != 0)
353 	src &= mixer->recdevs;
355 		src = mixer->recdevs & SOUND_MASK_MIC;
357 		src = mixer->recdevs & SOUND_MASK_MONITOR;
359 		src = mixer->recdevs & SOUND_MASK_LINE;
360 	if (src == 0 && mixer->recdevs != 0)
361 		src = (1 << (ffs(mixer->recdevs) - 1));
363 	MIXER_SET_UNLOCK(mixer, dropmtx);
364 	recsrc = MIXER_SETRECSRC(mixer, src);
365 	MIXER_SET_LOCK(mixer, dropmtx);
367 	mixer->recsrc = recsrc;
373 mixer_getrecsrc(struct snd_mixer *mixer)
375 	return mixer->recsrc;
390  * @param m	mixer context container thing
425  * @param m	mixer context container thing
482  * used by the rest of the mixer code.
492  * @param m	mixer device context container thing
622 	    ("invalid mixer type=%d", type));
625 	snprintf(m->name, sizeof(m->name), "%s:mixer",
632 	    "primary pcm mixer" : "secondary pcm mixer");
658 	    ("%s(): illegal mixer type=%d", __func__, m->type));
660 	/* mixer uninit can sleep --hps */
730 		 UID_ROOT, GID_WHEEL, 0666, "mixer%d", unit);
757 			device_printf(dev, "Soft PCM mixer ENABLED\n");
781 	    ("%s(): illegal mixer type=%d", __func__, m->type));
806 	/* mixer uninit can sleep --hps */
1126 	 * pcm or rec volume is by doing mixer ioctl
1128 	 * on its open fd, rather than cracky mixer bypassing here.
1247 	 * Certain ioctls may be made on any type of device (audio, mixer,
1341 	if (strcmp(name, "mixer") == 0) {
1373  * This function searches for a mixer based on the numeric ID stored
1375  * current mixer handling the request is provided.  Note, however, that
1376  * this ioctl may be made with any sound device (audio, mixer, midi).
1378  * @note Caller must not hold any PCM device, channel, or mixer locks.
1397 	 * If probing the device handling the ioctl, make sure it's a mixer
1398 	 * device.  (This ioctl is valid on audio, mixer, and midi devices.)
1409 	 * begin by iterating over PCM devices and search for our mixer.
1433 			 * - a specific mixer device has been locked, so be
1438 			snprintf(mi->id, sizeof(mi->id), "mixer%d", i);
1444 			 * a pcm and mixer devices, so this is hardcoded to 0.
1451 			 *       string that identifies the mixer better than
1483 			 * @note The priority field is for mixer applets to
1484 			 * determine which mixer should be the default, with 0
1490 			 * default mixer. Other devices use values 1 to 9
1514  * Allow the sound driver to use the mixer lock to protect its mixer