/*
* ALSA <-> OSS mixer control plugin
*
* Copyright (c) 2005 by Takashi Iwai <tiwai@suse.de>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* TODO: implement the pseudo poll with thread (and pipe as pollfd)?
*/
#include <stdio.h>
#include <sys/ioctl.h>
#include <alsa/asoundlib.h>
#include <alsa/control_external.h>
#include <linux/soundcard.h>
typedef struct snd_ctl_oss {
snd_ctl_ext_t ext;
char *device;
int fd;
int exclusive_input;
int stereo_mask;
unsigned int num_vol_ctls;
unsigned int vol_ctl[SOUND_MIXER_NRDEVICES];
unsigned int num_rec_items;
unsigned int rec_item[SOUND_MIXER_NRDEVICES];
} snd_ctl_oss_t;
static const char *const vol_devices[SOUND_MIXER_NRDEVICES] = {
[SOUND_MIXER_VOLUME] = "Master Playback Volume",
[SOUND_MIXER_BASS] = "Tone Control - Bass",
[SOUND_MIXER_TREBLE] = "Tone Control - Treble",
[SOUND_MIXER_SYNTH] = "Synth Playback Volume",
[SOUND_MIXER_PCM] = "PCM Playback Volume",
[SOUND_MIXER_SPEAKER] = "PC Speaker Playback Volume",
[SOUND_MIXER_LINE] = "Line Playback Volume",
[SOUND_MIXER_MIC] = "Mic Playback Volume",
[SOUND_MIXER_CD] = "CD Playback Volume",
[SOUND_MIXER_IMIX] = "Monitor Mix Playback Volume",
[SOUND_MIXER_ALTPCM] = "Headphone Playback Volume",
[SOUND_MIXER_RECLEV] = "Capture Volume",
[SOUND_MIXER_IGAIN] = "Capture Volume",
[SOUND_MIXER_OGAIN] = "Playback Volume",
[SOUND_MIXER_LINE1] = "Aux Playback Volume",
[SOUND_MIXER_LINE2] = "Aux1 Playback Volume",
[SOUND_MIXER_LINE3] = "Line1 Playback Volume",
[SOUND_MIXER_DIGITAL1] = "IEC958 Playback Volume",
[SOUND_MIXER_DIGITAL2] = "Digital Playback Volume",
[SOUND_MIXER_DIGITAL3] = "Digital1 Playback Volume",
[SOUND_MIXER_PHONEIN] = "Phone Playback Volume",
[SOUND_MIXER_PHONEOUT] = "Master Mono Playback Volume",
[SOUND_MIXER_VIDEO] = "Video Playback Volume",
[SOUND_MIXER_RADIO] = "Radio Playback Volume",
[SOUND_MIXER_MONITOR] = "Monitor Playback Volume",
};
static const char *const rec_devices[SOUND_MIXER_NRDEVICES] = {
[SOUND_MIXER_VOLUME] = "Mix Capture Switch",
[SOUND_MIXER_SYNTH] = "Synth Capture Switch",
[SOUND_MIXER_PCM] = "PCM Capture Switch",
[SOUND_MIXER_LINE] = "Line Capture Switch",
[SOUND_MIXER_MIC] = "Mic Capture Switch",
[SOUND_MIXER_CD] = "CD Capture Switch",
[SOUND_MIXER_LINE1] = "Aux Capture Switch",
[SOUND_MIXER_LINE2] = "Aux1 Capture Switch",
[SOUND_MIXER_LINE3] = "Line1 Capture Switch",
[SOUND_MIXER_DIGITAL1] = "IEC958 Capture Switch",
[SOUND_MIXER_DIGITAL2] = "Digital Capture Switch",
[SOUND_MIXER_DIGITAL3] = "Digital1 Capture Switch",
[SOUND_MIXER_PHONEIN] = "Phone Capture Switch",
[SOUND_MIXER_VIDEO] = "Video Capture Switch",
[SOUND_MIXER_RADIO] = "Radio Capture Switch",
};
static const char *const rec_items[SOUND_MIXER_NRDEVICES] = {
[SOUND_MIXER_VOLUME] = "Mix",
[SOUND_MIXER_SYNTH] = "Synth",
[SOUND_MIXER_PCM] = "PCM",
[SOUND_MIXER_LINE] = "Line",
[SOUND_MIXER_MIC] = "Mic",
[SOUND_MIXER_CD] = "CD",
[SOUND_MIXER_LINE1] = "Aux",
[SOUND_MIXER_LINE2] = "Aux1",
[SOUND_MIXER_LINE3] = "Line1",
[SOUND_MIXER_DIGITAL1] = "IEC958",
[SOUND_MIXER_DIGITAL2] = "Digital",
[SOUND_MIXER_DIGITAL3] = "Digital1",
[SOUND_MIXER_PHONEIN] = "Phone",
[SOUND_MIXER_VIDEO] = "Video",
[SOUND_MIXER_RADIO] = "Radio",
};
static void oss_close(snd_ctl_ext_t *ext)
{
snd_ctl_oss_t *oss = ext->private_data;
close(oss->fd);
free(oss->device);
free(oss);
}
static int oss_elem_count(snd_ctl_ext_t *ext)
{
snd_ctl_oss_t *oss = ext->private_data;
int num;
num = oss->num_vol_ctls;
if (oss->exclusive_input)
num++;
else if (oss->num_rec_items)
num += oss->num_rec_items;
return num;
}
static int oss_elem_list(snd_ctl_ext_t *ext, unsigned int offset, snd_ctl_elem_id_t *id)
{
snd_ctl_oss_t *oss = ext->private_data;
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
if (offset < oss->num_vol_ctls)
snd_ctl_elem_id_set_name(id, vol_devices[oss->vol_ctl[offset]]);
else if (oss->exclusive_input)
snd_ctl_elem_id_set_name(id, "Capture Source");
else {
offset -= oss->num_vol_ctls;
snd_ctl_elem_id_set_name(id, rec_devices[oss->rec_item[offset]]);
}
return 0;
}
#define OSS_KEY_DEVICE_MASK 0x1f
#define OSS_KEY_CAPTURE_FLAG (1 << 8)
#define OSS_KEY_CAPTURE_MUX (1 << 16)
static snd_ctl_ext_key_t oss_find_elem(snd_ctl_ext_t *ext,
const snd_ctl_elem_id_t *id)
{
snd_ctl_oss_t *oss = ext->private_data;
const char *name;
unsigned int i, key, numid;
numid = snd_ctl_elem_id_get_numid(id);
if (numid > 0) {
numid--;
if (numid < oss->num_vol_ctls)
return oss->vol_ctl[numid];
numid -= oss->num_vol_ctls;
if (oss->exclusive_input) {
if (!numid)
return OSS_KEY_CAPTURE_MUX;
} else if (numid < oss->num_rec_items)
return oss->rec_item[numid] |
OSS_KEY_CAPTURE_FLAG;
}
name = snd_ctl_elem_id_get_name(id);
if (! strcmp(name, "Capture Source")) {
if (oss->exclusive_input)
return OSS_KEY_CAPTURE_MUX;
else
return SND_CTL_EXT_KEY_NOT_FOUND;
}
for (i = 0; i < oss->num_vol_ctls; i++) {
key = oss->vol_ctl[i];
if (! strcmp(name, vol_devices[key]))
return key;
}
for (i = 0; i < oss->num_rec_items; i++) {
key = oss->rec_item[i];
if (! strcmp(name, rec_devices[key]))
return key | OSS_KEY_CAPTURE_FLAG;
}
return SND_CTL_EXT_KEY_NOT_FOUND;
}
static int oss_get_attribute(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
int *type, unsigned int *acc, unsigned int *count)
{
snd_ctl_oss_t *oss = ext->private_data;
if (key == OSS_KEY_CAPTURE_MUX) {
*type = SND_CTL_ELEM_TYPE_ENUMERATED;
*acc = SND_CTL_EXT_ACCESS_READWRITE;
*count = 1;
} else if (key & OSS_KEY_CAPTURE_FLAG) {
*type = SND_CTL_ELEM_TYPE_BOOLEAN;
*acc = SND_CTL_EXT_ACCESS_READWRITE;
*count = 1;
} else {
*type = SND_CTL_ELEM_TYPE_INTEGER;
*acc = SND_CTL_EXT_ACCESS_READWRITE;
if (oss->stereo_mask & (1 << key))
*count = 2;
else
*count = 1;
}
return 0;
}
static int oss_get_integer_info(snd_ctl_ext_t *ext ATTRIBUTE_UNUSED,
snd_ctl_ext_key_t key ATTRIBUTE_UNUSED,
long *imin, long *imax, long *istep)
{
*istep = 0;
*imin = 0;
*imax = 100;
return 0;
}
static int oss_get_enumerated_info(snd_ctl_ext_t *ext,
snd_ctl_ext_key_t key ATTRIBUTE_UNUSED,
unsigned int *items)
{
snd_ctl_oss_t *oss = ext->private_data;
*items = oss->num_rec_items;
return 0;
}
static int oss_get_enumerated_name(snd_ctl_ext_t *ext,
snd_ctl_ext_key_t key ATTRIBUTE_UNUSED,
unsigned int item, char *name,
size_t name_max_len)
{
snd_ctl_oss_t *oss = ext->private_data;
if (item >= oss->num_rec_items)
return -EINVAL;
item = oss->rec_item[item];
strncpy(name, rec_items[item], name_max_len - 1);
name[name_max_len - 1] = 0;
return 0;
}
static int oss_read_integer(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value)
{
snd_ctl_oss_t *oss = ext->private_data;
int val;
if (key & OSS_KEY_CAPTURE_FLAG) {
key &= OSS_KEY_DEVICE_MASK;
if (ioctl(oss->fd, SOUND_MIXER_READ_RECSRC, &val) < 0)
return -errno;
*value = (val & (1 << key)) ? 1 : 0;
} else {
if (ioctl(oss->fd, MIXER_READ(key), &val) < 0)
return -errno;
*value = val & 0xff;
if (oss->stereo_mask & (1 << key))
value[1] = (val >> 8) & 0xff;
}
return 0;
}
static int oss_read_enumerated(snd_ctl_ext_t *ext,
snd_ctl_ext_key_t key ATTRIBUTE_UNUSED,
unsigned int *items)
{
snd_ctl_oss_t *oss = ext->private_data;
unsigned int i, val;
*items = 0;
if (ioctl(oss->fd, SOUND_MIXER_READ_RECSRC, &val) < 0)
return -errno;
for (i = 0; i < oss->num_rec_items; i++) {
if (val & (1 << oss->rec_item[i])) {
*items = i;
break;
}
}
return 0;
}
static int oss_write_integer(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value)
{
snd_ctl_oss_t *oss = ext->private_data;
int val, oval;
if (key & OSS_KEY_CAPTURE_FLAG) {
key &= OSS_KEY_DEVICE_MASK;
if (ioctl(oss->fd, SOUND_MIXER_READ_RECSRC, &oval) < 0)
return -errno;
if (*value)
val = oval | (1 << key);
else
val = oval & ~(1 << key);
if (oval == val)
return 0;
if (ioctl(oss->fd, SOUND_MIXER_WRITE_RECSRC, &val) < 0)
return -errno;
return 1;
} else {
val = *value;
if (oss->stereo_mask & (1 << key))
val |= value[1] << 8;
if (ioctl(oss->fd, MIXER_READ(key), &oval) < 0)
return -errno;
if (oval == val)
return 0;
if (ioctl(oss->fd, MIXER_WRITE(key), &val) < 0)
return -errno;
return 1;
}
}
static int oss_write_enumerated(snd_ctl_ext_t *ext,
snd_ctl_ext_key_t key ATTRIBUTE_UNUSED,
unsigned int *items)
{
snd_ctl_oss_t *oss = ext->private_data;
int val, oval;
if (ioctl(oss->fd, SOUND_MIXER_READ_RECSRC, &oval) < 0)
return -errno;
val = 1 << oss->rec_item[*items];
if (val == oval)
return 0;
if (ioctl(oss->fd, SOUND_MIXER_WRITE_RECSRC, &val) < 0)
return -errno;
return 1;
}
static int oss_read_event(snd_ctl_ext_t *ext ATTRIBUTE_UNUSED,
snd_ctl_elem_id_t *id ATTRIBUTE_UNUSED,
unsigned int *event_mask ATTRIBUTE_UNUSED)
{
return -EAGAIN;
}
static snd_ctl_ext_callback_t oss_ext_callback = {
.close = oss_close,
.elem_count = oss_elem_count,
.elem_list = oss_elem_list,
.find_elem = oss_find_elem,
.get_attribute = oss_get_attribute,
.get_integer_info = oss_get_integer_info,
.get_enumerated_info = oss_get_enumerated_info,
.get_enumerated_name = oss_get_enumerated_name,
.read_integer = oss_read_integer,
.read_enumerated = oss_read_enumerated,
.write_integer = oss_write_integer,
.write_enumerated = oss_write_enumerated,
.read_event = oss_read_event,
};
SND_CTL_PLUGIN_DEFINE_FUNC(oss)
{
snd_config_iterator_t it, next;
const char *device = "/dev/mixer";
struct mixer_info mixinfo;
int i, err, val;
snd_ctl_oss_t *oss;
snd_config_for_each(it, next, conf) {
snd_config_t *n = snd_config_iterator_entry(it);
const char *id;
if (snd_config_get_id(n, &id) < 0)
continue;
if (strcmp(id, "comment") == 0 || strcmp(id, "type") == 0 || strcmp(id, "hint") == 0)
continue;
if (strcmp(id, "device") == 0) {
if (snd_config_get_string(n, &device) < 0) {
SNDERR("Invalid type for %s", id);
return -EINVAL;
}
continue;
}
SNDERR("Unknown field %s", id);
return -EINVAL;
}
oss = calloc(1, sizeof(*oss));
oss->device = strdup(device);
oss->fd = -1;
if (oss->device == NULL) {
SNDERR("cannot allocate");
free(oss);
return -ENOMEM;
}
oss->fd = open(device, O_RDWR);
if (oss->fd < 0) {
err = -errno;
SNDERR("Cannot open device %s", device);
goto error;
}
if (ioctl(oss->fd, SOUND_MIXER_INFO, &mixinfo) < 0) {
err = -errno;
SNDERR("Cannot get mixer info for device %s", device);
goto error;
}
oss->ext.version = SND_CTL_EXT_VERSION;
oss->ext.card_idx = 0; /* FIXME */
strncpy(oss->ext.id, mixinfo.id, sizeof(oss->ext.id) - 1);
strcpy(oss->ext.driver, "OSS-Emulation");
strncpy(oss->ext.name, mixinfo.name, sizeof(oss->ext.name) - 1);
strncpy(oss->ext.longname, mixinfo.name, sizeof(oss->ext.longname) - 1);
strncpy(oss->ext.mixername, mixinfo.name, sizeof(oss->ext.mixername) - 1);
oss->ext.poll_fd = -1;
oss->ext.callback = &oss_ext_callback;
oss->ext.private_data = oss;
oss->num_vol_ctls = 0;
val = 0;
if (ioctl(oss->fd, SOUND_MIXER_READ_DEVMASK, &val) < 0)
perror("ctl_oss: DEVMASK error");
else {
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
if ((val & (1 << i)) && vol_devices[i])
oss->vol_ctl[oss->num_vol_ctls++] = i;
}
}
if (ioctl(oss->fd, SOUND_MIXER_READ_STEREODEVS, &oss->stereo_mask) < 0)
perror("ctl_oss: STEREODEVS error");
val = 0;
if (ioctl(oss->fd, SOUND_MIXER_READ_CAPS, &val) < 0)
perror("ctl_oss: MIXER_CAPS error");
else if (val & SOUND_CAP_EXCL_INPUT)
oss->exclusive_input = 1;
oss->num_rec_items = 0;
val = 0;
if (ioctl(oss->fd, SOUND_MIXER_READ_RECMASK, &val) < 0)
perror("ctl_oss: MIXER_RECMASK error");
else {
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
if (val & (1 << i)) {
if (oss->exclusive_input) {
if (! rec_items[i])
continue;
} else {
if (! rec_devices[i])
continue;
}
oss->rec_item[oss->num_rec_items++] = i;
}
}
}
if (! oss->num_rec_items)
oss->exclusive_input = 0;
err = snd_ctl_ext_create(&oss->ext, name, mode);
if (err < 0)
goto error;
*handlep = oss->ext.handle;
return 0;
error:
if (oss->fd >= 0)
close(oss->fd);
free(oss->device);
free(oss);
return err;
}
SND_CTL_PLUGIN_SYMBOL(oss);