sound/pcm/mixer.c

38 SND_DECLARE_FILE("$FreeBSD: releng/11.0/sys/dev/sound/pcm/mixer.c 280442 2015-03-24 16:31:22Z hselasky $");
40 static MALLOC_DEFINE(M_MIXER, "mixer", "mixer");
45     "control channel pcm/rec volume, bypassing real mixer device");
70 	 * mixer's controls.  A change in value indicates that persistent
71 	 * mixer applications should update their displays.
105 	.d_name =	"mixer",
109  * Keeps a count of mixer devices; used only by OSSv4 SNDCTL_SYSINFO ioctl.
330 mixer_get(struct snd_mixer *mixer, int dev)
332 	if ((dev < SOUND_MIXER_NRDEVICES) && (mixer->devs & (1 << dev)))
333 		return mixer->level[dev];
339 mixer_setrecsrc(struct snd_mixer *mixer, u_int32_t src)
345 	d = device_get_softc(mixer->dev);
348 	if (!(d->flags & SD_F_MPSAFE) && mtx_owned(mixer->lock) != 0)
352 	src &= mixer->recdevs;
354 		src = mixer->recdevs & SOUND_MASK_MIC;
356 		src = mixer->recdevs & SOUND_MASK_MONITOR;
358 		src = mixer->recdevs & SOUND_MASK_LINE;
359 	if (src == 0 && mixer->recdevs != 0)
360 		src = (1 << (ffs(mixer->recdevs) - 1));
362 	MIXER_SET_UNLOCK(mixer, dropmtx);
363 	recsrc = MIXER_SETRECSRC(mixer, src);
364 	MIXER_SET_LOCK(mixer, dropmtx);
366 	mixer->recsrc = recsrc;
372 mixer_getrecsrc(struct snd_mixer *mixer)
374 	return mixer->recsrc;
389  * @param m	mixer context container thing
424  * @param m	mixer context container thing
481  * used by the rest of the mixer code.
491  * @param m	mixer device context container thing
621 	    ("invalid mixer type=%d", type));
624 	snprintf(m->name, sizeof(m->name), "%s:mixer",
631 	    "primary pcm mixer" : "secondary pcm mixer");
657 	    ("%s(): illegal mixer type=%d", __func__, m->type));
659 	/* mixer uninit can sleep --hps */
729 		 UID_ROOT, GID_WHEEL, 0666, "mixer%d", unit);
756 			device_printf(dev, "Soft PCM mixer ENABLED\n");
780 	    ("%s(): illegal mixer type=%d", __func__, m->type));
805 	/* mixer uninit can sleep --hps */
1125 	 * pcm or rec volume is by doing mixer ioctl
1127 	 * on its open fd, rather than cracky mixer bypassing here.
1246 	 * Certain ioctls may be made on any type of device (audio, mixer,
1338 	if (strcmp(name, "mixer") == 0) {
1370  * This function searches for a mixer based on the numeric ID stored
1372  * current mixer handling the request is provided.  Note, however, that
1373  * this ioctl may be made with any sound device (audio, mixer, midi).
1375  * @note Caller must not hold any PCM device, channel, or mixer locks.
1394 	 * If probing the device handling the ioctl, make sure it's a mixer
1395 	 * device.  (This ioctl is valid on audio, mixer, and midi devices.)
1406 	 * begin by iterating over PCM devices and search for our mixer.
1430 			 * - a specific mixer device has been locked, so be
1435 			snprintf(mi->id, sizeof(mi->id), "mixer%d", i);
1441 			 * a pcm and mixer devices, so this is hardcoded to 0.
1448 			 *       string that identifies the mixer better than
1480 			 * @note The priority field is for mixer applets to
1481 			 * determine which mixer should be the default, with 0
1487 			 * default mixer. Other devices use values 1 to 9
1511  * Allow the sound driver to use the mixer lock to protect its mixer