Differential Revision: https://reviews.freebsd.org/D33732 Submitted by: christos@ MFC after: 1 week Sponsored by: NVIDIA Networking
499 lines
11 KiB
C
499 lines
11 KiB
C
/*-
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* Copyright (c) 2021 Christos Margiolis <christos@FreeBSD.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <sys/soundcard.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "mixer.h"
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#define BASEPATH "/dev/mixer"
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static int _mixer_readvol(struct mixer *, struct mix_dev *);
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/*
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* Fetch volume from the device.
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*/
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static int
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_mixer_readvol(struct mixer *m, struct mix_dev *dev)
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{
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int v;
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if (ioctl(m->fd, MIXER_READ(dev->devno), &v) < 0)
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return (-1);
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dev->vol.left = MIX_VOLNORM(v & 0x00ff);
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dev->vol.right = MIX_VOLNORM((v >> 8) & 0x00ff);
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return (0);
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}
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/*
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* Open a mixer device in `/dev/mixerN`, where N is the number of the mixer.
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* Each device maps to an actual pcm audio card, so `/dev/mixer0` is the
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* mixer for pcm0, and so on.
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*
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* @param name path to mixer device. NULL or "/dev/mixer" for the
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* the default mixer (i.e `hw.snd.default_unit`).
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*/
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struct mixer *
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mixer_open(const char *name)
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{
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struct mixer *m = NULL;
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struct mix_dev *dp;
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const char *names[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
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int i;
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if ((m = calloc(1, sizeof(struct mixer))) == NULL)
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goto fail;
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if (name != NULL) {
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/* `name` does not start with "/dev/mixer". */
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if (strncmp(name, BASEPATH, strlen(BASEPATH)) != 0) {
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m->unit = -1;
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} else {
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/* `name` is "/dev/mixer" so, we'll use the default unit. */
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if (strncmp(name, BASEPATH, strlen(name)) == 0)
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goto dunit;
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m->unit = strtol(name + strlen(BASEPATH), NULL, 10);
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}
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(void)strlcpy(m->name, name, sizeof(m->name));
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} else {
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dunit:
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if ((m->unit = mixer_get_dunit()) < 0)
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goto fail;
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(void)snprintf(m->name, sizeof(m->name), "/dev/mixer%d", m->unit);
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}
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if ((m->fd = open(m->name, O_RDWR)) < 0)
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goto fail;
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m->devmask = m->recmask = m->recsrc = 0;
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m->f_default = m->unit == mixer_get_dunit();
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m->mode = mixer_get_mode(m->unit);
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/* The unit number _must_ be set before the ioctl. */
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m->mi.dev = m->unit;
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m->ci.card = m->unit;
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if (ioctl(m->fd, SNDCTL_MIXERINFO, &m->mi) < 0) {
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memset(&m->mi, 0, sizeof(m->mi));
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strlcpy(m->mi.name, m->name, sizeof(m->mi.name));
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}
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if (ioctl(m->fd, SNDCTL_CARDINFO, &m->ci) < 0)
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memset(&m->ci, 0, sizeof(m->ci));
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if (ioctl(m->fd, SOUND_MIXER_READ_DEVMASK, &m->devmask) < 0 ||
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ioctl(m->fd, SOUND_MIXER_READ_MUTE, &m->mutemask) < 0 ||
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ioctl(m->fd, SOUND_MIXER_READ_RECMASK, &m->recmask) < 0 ||
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ioctl(m->fd, SOUND_MIXER_READ_RECSRC, &m->recsrc) < 0)
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goto fail;
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TAILQ_INIT(&m->devs);
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for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
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if (!MIX_ISDEV(m, i))
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continue;
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if ((dp = calloc(1, sizeof(struct mix_dev))) == NULL)
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goto fail;
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dp->parent_mixer = m;
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dp->devno = i;
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dp->nctl = 0;
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if (_mixer_readvol(m, dp) < 0)
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goto fail;
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(void)strlcpy(dp->name, names[i], sizeof(dp->name));
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TAILQ_INIT(&dp->ctls);
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TAILQ_INSERT_TAIL(&m->devs, dp, devs);
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m->ndev++;
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}
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/* The default device is always "vol". */
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m->dev = TAILQ_FIRST(&m->devs);
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return (m);
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fail:
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if (m != NULL)
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(void)mixer_close(m);
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return (NULL);
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}
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/*
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* Free resources and close the mixer.
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*/
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int
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mixer_close(struct mixer *m)
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{
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struct mix_dev *dp;
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int r;
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r = close(m->fd);
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while (!TAILQ_EMPTY(&m->devs)) {
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dp = TAILQ_FIRST(&m->devs);
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TAILQ_REMOVE(&m->devs, dp, devs);
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while (!TAILQ_EMPTY(&dp->ctls))
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(void)mixer_remove_ctl(TAILQ_FIRST(&dp->ctls));
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free(dp);
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}
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free(m);
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return (r);
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}
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/*
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* Select a mixer device. The mixer structure keeps a list of all the devices
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* the mixer has, but only one can be manipulated at a time -- this is what
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* the `dev` in the mixer structure field is for. Each time a device is to be
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* manipulated, `dev` has to point to it first.
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*
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* The caller must manually assign the return value to `m->dev`.
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*/
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struct mix_dev *
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mixer_get_dev(struct mixer *m, int dev)
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{
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struct mix_dev *dp;
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if (dev < 0 || dev >= m->ndev) {
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errno = ERANGE;
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return (NULL);
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}
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TAILQ_FOREACH(dp, &m->devs, devs) {
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if (dp->devno == dev)
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return (dp);
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}
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errno = EINVAL;
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return (NULL);
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}
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/*
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* Select a device by name.
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*
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* @param name device name (e.g vol, pcm, ...)
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*/
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struct mix_dev *
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mixer_get_dev_byname(struct mixer *m, const char *name)
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{
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struct mix_dev *dp;
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TAILQ_FOREACH(dp, &m->devs, devs) {
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if (!strncmp(dp->name, name, sizeof(dp->name)))
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return (dp);
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}
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errno = EINVAL;
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return (NULL);
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}
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/*
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* Add a mixer control to a device.
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*/
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int
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mixer_add_ctl(struct mix_dev *parent_dev, int id, const char *name,
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int (*mod)(struct mix_dev *, void *),
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int (*print)(struct mix_dev *, void *))
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{
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struct mix_dev *dp;
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mix_ctl_t *ctl, *cp;
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/* XXX: should we accept NULL name? */
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if (parent_dev == NULL) {
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errno = EINVAL;
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return (-1);
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}
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if ((ctl = calloc(1, sizeof(mix_ctl_t))) == NULL)
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return (-1);
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ctl->parent_dev = parent_dev;
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ctl->id = id;
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if (name != NULL)
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(void)strlcpy(ctl->name, name, sizeof(ctl->name));
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ctl->mod = mod;
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ctl->print = print;
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dp = ctl->parent_dev;
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/* Make sure the same ID or name doesn't exist already. */
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TAILQ_FOREACH(cp, &dp->ctls, ctls) {
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if (!strncmp(cp->name, name, sizeof(cp->name)) || cp->id == id) {
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errno = EINVAL;
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return (-1);
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}
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}
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TAILQ_INSERT_TAIL(&dp->ctls, ctl, ctls);
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dp->nctl++;
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return (0);
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}
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/*
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* Same as `mixer_add_ctl`.
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*/
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int
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mixer_add_ctl_s(mix_ctl_t *ctl)
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{
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if (ctl == NULL)
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return (-1);
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return (mixer_add_ctl(ctl->parent_dev, ctl->id, ctl->name,
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ctl->mod, ctl->print));
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}
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/*
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* Remove a mixer control from a device.
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*/
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int
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mixer_remove_ctl(mix_ctl_t *ctl)
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{
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struct mix_dev *p;
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if (ctl == NULL) {
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errno = EINVAL;
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return (-1);
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}
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p = ctl->parent_dev;
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if (!TAILQ_EMPTY(&p->ctls)) {
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TAILQ_REMOVE(&p->ctls, ctl, ctls);
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free(ctl);
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}
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return (0);
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}
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/*
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* Get a mixer control by id.
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*/
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mix_ctl_t *
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mixer_get_ctl(struct mix_dev *d, int id)
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{
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mix_ctl_t *cp;
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TAILQ_FOREACH(cp, &d->ctls, ctls) {
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if (cp->id == id)
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return (cp);
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}
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errno = EINVAL;
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return (NULL);
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}
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/*
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* Get a mixer control by name.
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*/
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mix_ctl_t *
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mixer_get_ctl_byname(struct mix_dev *d, const char *name)
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{
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mix_ctl_t *cp;
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TAILQ_FOREACH(cp, &d->ctls, ctls) {
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if (!strncmp(cp->name, name, sizeof(cp->name)))
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return (cp);
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}
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errno = EINVAL;
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return (NULL);
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}
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/*
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* Change the mixer's left and right volume. The allowed volume values are
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* between MIX_VOLMIN and MIX_VOLMAX. The `ioctl` for volume change requires
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* an integer value between 0 and 100 stored as `lvol | rvol << 8` -- for
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* that reason, we de-normalize the 32-bit float volume value, before
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* we pass it to the `ioctl`.
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*
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* Volume clumping should be done by the caller.
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*/
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int
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mixer_set_vol(struct mixer *m, mix_volume_t vol)
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{
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int v;
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if (vol.left < MIX_VOLMIN || vol.left > MIX_VOLMAX ||
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vol.right < MIX_VOLMIN || vol.right > MIX_VOLMAX) {
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errno = ERANGE;
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return (-1);
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}
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v = MIX_VOLDENORM(vol.left) | MIX_VOLDENORM(vol.right) << 8;
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if (ioctl(m->fd, MIXER_WRITE(m->dev->devno), &v) < 0)
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return (-1);
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if (_mixer_readvol(m, m->dev) < 0)
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return (-1);
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return (0);
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}
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/*
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* Manipulate a device's mute.
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*
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* @param opt MIX_MUTE mute device
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* MIX_UNMUTE unmute device
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* MIX_TOGGLEMUTE toggle device's mute
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*/
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int
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mixer_set_mute(struct mixer *m, int opt)
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{
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switch (opt) {
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case MIX_MUTE:
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m->mutemask |= (1 << m->dev->devno);
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break;
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case MIX_UNMUTE:
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m->mutemask &= ~(1 << m->dev->devno);
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break;
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case MIX_TOGGLEMUTE:
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m->mutemask ^= (1 << m->dev->devno);
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break;
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default:
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errno = EINVAL;
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return (-1);
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}
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if (ioctl(m->fd, SOUND_MIXER_WRITE_MUTE, &m->mutemask) < 0)
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return (-1);
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if (ioctl(m->fd, SOUND_MIXER_READ_MUTE, &m->mutemask) < 0)
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return (-1);
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return 0;
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}
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/*
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* Modify a recording device. The selected device has to be a recording device,
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* otherwise the function will fail.
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*
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* @param opt MIX_ADDRECSRC add device to recording sources
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* MIX_REMOVERECSRC remove device from recording sources
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* MIX_SETRECSRC set device as the only recording source
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* MIX_TOGGLERECSRC toggle device from recording sources
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*/
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int
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mixer_mod_recsrc(struct mixer *m, int opt)
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{
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if (!m->recmask || !MIX_ISREC(m, m->dev->devno)) {
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errno = ENODEV;
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return (-1);
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}
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switch (opt) {
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case MIX_ADDRECSRC:
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m->recsrc |= (1 << m->dev->devno);
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break;
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case MIX_REMOVERECSRC:
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m->recsrc &= ~(1 << m->dev->devno);
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break;
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case MIX_SETRECSRC:
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m->recsrc = (1 << m->dev->devno);
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break;
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case MIX_TOGGLERECSRC:
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m->recsrc ^= (1 << m->dev->devno);
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break;
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default:
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errno = EINVAL;
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return (-1);
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}
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if (ioctl(m->fd, SOUND_MIXER_WRITE_RECSRC, &m->recsrc) < 0)
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return (-1);
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if (ioctl(m->fd, SOUND_MIXER_READ_RECSRC, &m->recsrc) < 0)
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return (-1);
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return (0);
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}
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/*
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* Get default audio card's number. This is used to open the default mixer
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* and set the mixer structure's `f_default` flag.
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*/
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int
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mixer_get_dunit(void)
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{
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size_t size;
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int unit;
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size = sizeof(int);
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if (sysctlbyname("hw.snd.default_unit", &unit, &size, NULL, 0) < 0)
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return (-1);
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return (unit);
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}
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/*
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* Change the default audio card. This is normally _not_ a mixer feature, but
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* it's useful to have, so the caller can avoid having to manually use
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* the sysctl API.
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*
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* @param unit the audio card number (e.g pcm0, pcm1, ...).
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*/
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int
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mixer_set_dunit(struct mixer *m, int unit)
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{
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size_t size;
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size = sizeof(int);
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if (sysctlbyname("hw.snd.default_unit", NULL, 0, &unit, size) < 0)
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return (-1);
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/* XXX: how will other mixers get updated? */
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m->f_default = m->unit == unit;
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return (0);
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}
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/*
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* Get sound device mode (none, play, rec, play+rec). Userland programs can
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* use the MIX_MODE_* flags to determine the mode of the device.
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*/
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int
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mixer_get_mode(int unit)
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{
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char buf[64];
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size_t size;
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unsigned int mode;
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(void)snprintf(buf, sizeof(buf), "dev.pcm.%d.mode", unit);
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size = sizeof(unsigned int);
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if (sysctlbyname(buf, &mode, &size, NULL, 0) < 0)
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return (0);
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return (mode);
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}
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/*
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* Get the total number of mixers in the system.
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*/
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int
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mixer_get_nmixers(void)
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{
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struct mixer *m;
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oss_sysinfo si;
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/*
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* Open a dummy mixer because we need the `fd` field for the
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* `ioctl` to work.
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*/
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if ((m = mixer_open(NULL)) == NULL)
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return (-1);
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if (ioctl(m->fd, OSS_SYSINFO, &si) < 0) {
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(void)mixer_close(m);
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return (-1);
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}
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(void)mixer_close(m);
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return (si.nummixers);
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}
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