/**
* \brief return ASCII CTL element identifier name
* \param id CTL identifier
* \return ascii identifier of CTL element
*
* The string is allocated using strdup().
*/
char *snd_ctl_ascii_elem_id_get(snd_ctl_elem_id_t *id)
{
unsigned int index, device, subdevice;
char buf[256], buf1[32];
snprintf(buf, sizeof(buf), "numid=%u,iface=%s,name='%s'",
snd_ctl_elem_id_get_numid(id),
snd_ctl_elem_iface_name(
snd_ctl_elem_id_get_interface(id)),
snd_ctl_elem_id_get_name(id));
buf[sizeof(buf)-1] = '\0';
index = snd_ctl_elem_id_get_index(id);
device = snd_ctl_elem_id_get_device(id);
subdevice = snd_ctl_elem_id_get_subdevice(id);
if (index) {
snprintf(buf1, sizeof(buf1), ",index=%i", index);
if (strlen(buf) + strlen(buf1) < sizeof(buf))
strcat(buf, buf1);
}
if (device) {
snprintf(buf1, sizeof(buf1), ",device=%i", device);
if (strlen(buf) + strlen(buf1) < sizeof(buf))
strcat(buf, buf1);
}
if (subdevice) {
snprintf(buf1, sizeof(buf1), ",subdevice=%i", subdevice);
if (strlen(buf) + strlen(buf1) < sizeof(buf))
strcat(buf, buf1);
}
return strdup(buf);
}
static char *id_str(snd_ctl_elem_id_t *id)
{
static char str[128];
assert(id);
sprintf(str, "%i,%i,%i,%s,%i",
snd_ctl_elem_id_get_interface(id),
snd_ctl_elem_id_get_device(id),
snd_ctl_elem_id_get_subdevice(id),
snd_ctl_elem_id_get_name(id),
snd_ctl_elem_id_get_index(id));
return str;
}
static void show_control_id(snd_ctl_elem_id_t *id)
{
unsigned int index, device, subdevice;
printf("numid=%u,iface=%s,name='%s'",
snd_ctl_elem_id_get_numid(id),
control_iface(id),
snd_ctl_elem_id_get_name(id));
index = snd_ctl_elem_id_get_index(id);
device = snd_ctl_elem_id_get_device(id);
subdevice = snd_ctl_elem_id_get_subdevice(id);
if (index)
printf(",index=%i", index);
if (device)
printf(",device=%i", device);
if (subdevice)
printf(",subdevice=%i", subdevice);
}
static int check_elems(struct elem_set_trial *trial)
{
snd_ctl_elem_value_t *data;
unsigned int numid;
unsigned int index;
unsigned int i;
int err;
snd_ctl_elem_value_alloca(&data);
snd_ctl_elem_value_set_id(data, trial->id);
numid = snd_ctl_elem_id_get_numid(trial->id);
index = snd_ctl_elem_id_get_index(trial->id);
for (i = 0; i < trial->element_count; ++i) {
snd_ctl_elem_value_set_index(data, index + i);
/*
* In Linux 4.0 or former, ioctl(SNDRV_CTL_IOCTL_ELEM_ADD)
* doesn't fill all of fields for identification.
*/
if (numid > 0)
snd_ctl_elem_value_set_numid(data, numid + i);
err = snd_ctl_elem_read(trial->handle, data);
if (err < 0)
return err;
/* Change members of an element in this element set. */
trial->change_elem_members(trial, data);
err = snd_ctl_elem_write(trial->handle, data);
if (err < 0)
return err;
}
return 0;
}
static void show_control_id(snd_ctl_elem_id_t *id)
{
unsigned int index, device, subdevice;
const char *hctlname;
hctlname = snd_ctl_elem_id_get_name(id);
LOGV("numid=%u,name='%s'",
snd_ctl_elem_id_get_numid(id),
hctlname);
index = snd_ctl_elem_id_get_index(id);
device = snd_ctl_elem_id_get_device(id);
subdevice = snd_ctl_elem_id_get_subdevice(id);
if (index)
LOGV(",index=%i", index);
if (device)
LOGV(",device=%i", device);
if (subdevice)
LOGV(",subdevice=%i", subdevice);
/* For we just need to get to know that whether there is a control for "Playback" and "control"
* we just pick up these two elements
*/
if (strstr(hctlname,"Playback Volume")|| strstr(hctlname, "Capture Volume"))
LOGD("found placback/capture volume");
}
static int check_elem_set_props(struct elem_set_trial *trial)
{
snd_ctl_elem_id_t *id;
snd_ctl_elem_info_t *info;
unsigned int numid;
unsigned int index;
unsigned int i;
unsigned int j;
int err;
snd_ctl_elem_id_alloca(&id);
snd_ctl_elem_info_alloca(&info);
snd_ctl_elem_info_set_id(info, trial->id);
numid = snd_ctl_elem_id_get_numid(trial->id);
index = snd_ctl_elem_id_get_index(trial->id);
for (i = 0; i < trial->element_count; ++i) {
snd_ctl_elem_info_set_index(info, index + i);
/*
* In Linux 4.0 or former, ioctl(SNDRV_CTL_IOCTL_ELEM_ADD)
* doesn't fill all of fields for identification.
*/
if (numid > 0)
snd_ctl_elem_info_set_numid(info, numid + i);
err = snd_ctl_elem_info(trial->handle, info);
if (err < 0)
return err;
/* Check some common properties. */
if (snd_ctl_elem_info_get_type(info) != trial->type)
return -EIO;
if (snd_ctl_elem_info_get_count(info) != trial->member_count)
return -EIO;
for (j = 0; j < 4; ++j) {
if (snd_ctl_elem_info_get_dimension(info, j) !=
trial->dimension[j])
return -EIO;
}
/*
* In a case of IPC, this is the others. But in this case,
* it's myself.
*/
if (snd_ctl_elem_info_get_owner(info) != getpid())
return -EIO;
/*
* Just adding an element set by userspace applications,
* included elements are initially locked.
*/
if (!snd_ctl_elem_info_is_locked(info))
return -EIO;
/* Check type-specific properties. */
if (trial->check_elem_props != NULL) {
err = trial->check_elem_props(trial, info);
if (err < 0)
return err;
}
snd_ctl_elem_info_get_id(info, id);
err = snd_ctl_elem_unlock(trial->handle, id);
if (err < 0)
return err;
}
return 0;
}
