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Add set_dB ops to simple mixer

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Added the set_dB ops to simple mixer.
This commit is contained in:
Takashi Iwai 2006-08-25 11:56:50 +02:00
parent 448cbb6141
commit 4962ec5a5c
1 changed files with 63 additions and 21 deletions
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84
src/mixer/simple_none.c
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@ -969,6 +969,8 @@ static int get_volume_ops(snd_mixer_elem_t *elem, int dir,
return 0;
}
static int init_db_range(snd_hctl_elem_t *ctl, struct selem_str *rec);
/* convert to index of integer array */
#define int_index(size) (((size) + sizeof(int) - 1) / sizeof(int))
@ -1019,10 +1021,15 @@ static int parse_db_range(struct selem_str *rec, unsigned int *tlv,
/* convert the given raw volume value to a dB gain
*/
static int convert_db_range(struct selem_str *rec, long volume, long *db_gain)
static int convert_to_dB(snd_hctl_elem_t *ctl, struct selem_str *rec,
long volume, long *db_gain)
{
int min, step, mute;
if (init_db_range(ctl, rec) < 0)
return -EINVAL;
switch (rec->db_info[0]) {
case SND_CTL_TLVT_DB_SCALE:
min = rec->db_info[2];
@ -1045,6 +1052,11 @@ static int init_db_range(snd_hctl_elem_t *ctl, struct selem_str *rec)
unsigned int *tlv = NULL;
const unsigned int tlv_size = 4096;
if (rec->db_init_error)
return -EINVAL;
if (rec->db_initialized)
return 0;
snd_ctl_elem_info_alloca(&info);
if (snd_hctl_elem_info(ctl, info) < 0)
goto error;
@ -1087,17 +1099,16 @@ static selem_ctl_t *get_selem_ctl(selem_none_t *s, int dir)
return c;
}
/* Get the dB min/max values
*/
static int get_dB_range(snd_hctl_elem_t *ctl, struct selem_str *rec,
long *min, long *max)
{
int step;
if (rec->db_init_error)
if (init_db_range(ctl, rec) < 0)
return -EINVAL;
if (! rec->db_initialized) {
if (init_db_range(ctl, rec) < 0)
return -EINVAL;
}
switch (rec->db_info[0]) {
case SND_CTL_TLVT_DB_SCALE:
*min = (int)rec->db_info[2];
@ -1121,18 +1132,40 @@ static int get_dB_range_ops(snd_mixer_elem_t *elem, int dir,
return get_dB_range(c->elem, &s->str[dir], min, max);
}
static int get_dB_gain(snd_hctl_elem_t *ctl, struct selem_str *rec,
long volume, long *db_gain)
/* Convert from dB gain to the corresponding raw value.
* The value is round up when xdir > 0.
*/
static int convert_from_dB(snd_hctl_elem_t *ctl, struct selem_str *rec,
long db_gain, long *value, int xdir)
{
if (rec->db_init_error)
if (init_db_range(ctl, rec) < 0)
return -EINVAL;
if (! rec->db_initialized) {
if (init_db_range(ctl, rec) < 0)
return -EINVAL;
switch (rec->db_info[0]) {
case SND_CTL_TLVT_DB_SCALE: {
int min, step, max;
min = rec->db_info[2];
step = (rec->db_info[3] & 0xffff);
max = min + (int)(step * rec->max);
if (db_gain <= min)
*value = rec->min;
else if (db_gain >= max)
*value = rec->max;
else {
long v = (db_gain - min) * (rec->max - rec->min);
if (xdir > 0)
v += (max - min) - 1;
v = v / (max - min) + rec->min;
*value = v;
}
return 0;
}
return convert_db_range(rec, volume, db_gain);
default:
break;
}
return -EINVAL;
}
static int get_dB_ops(snd_mixer_elem_t *elem,
int dir,
snd_mixer_selem_channel_id_t channel,
@ -1148,7 +1181,7 @@ static int get_dB_ops(snd_mixer_elem_t *elem,
return -EINVAL;
if ((err = get_volume_ops(elem, dir, channel, &volume)) < 0)
goto _err;
if ((err = get_dB_gain(c->elem, &s->str[dir], volume, &db_gain)) < 0)
if ((err = convert_to_dB(c->elem, &s->str[dir], volume, &db_gain)) < 0)
goto _err;
err = 0;
*value = db_gain;
@ -1178,13 +1211,22 @@ static int set_volume_ops(snd_mixer_elem_t *elem, int dir,
return 0;
}
static int set_dB_ops(snd_mixer_elem_t *elem ATTRIBUTE_UNUSED,
int dir ATTRIBUTE_UNUSED,
snd_mixer_selem_channel_id_t channel ATTRIBUTE_UNUSED,
long value ATTRIBUTE_UNUSED,
int xdir ATTRIBUTE_UNUSED)
static int set_dB_ops(snd_mixer_elem_t *elem, int dir,
snd_mixer_selem_channel_id_t channel,
long db_gain, int xdir)
{
return -ENXIO;
selem_none_t *s = snd_mixer_elem_get_private(elem);
selem_ctl_t *c;
long value;
int err;
c = get_selem_ctl(s, dir);
if (! c)
return -EINVAL;
err = convert_from_dB(c->elem, &s->str[dir], db_gain, &value, xdir);
if (err < 0)
return err;
return set_volume_ops(elem, dir, channel, value);
}
static int set_switch_ops(snd_mixer_elem_t *elem, int dir,