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Add alsa wrappers to get control values

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Change-Id: Ic870261888f35717bfa939029dcd64bfe1a3df33
This commit is contained in:
Amaury Pouly 2017-10-07 21:58:36 +02:00
parent 5af813c5b7
commit 26d18fd348
2 changed files with 63 additions and 14 deletions
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69
firmware/target/hosted/alsa-controls.c
View file

@ -108,8 +108,8 @@ int alsa_controls_find_enum(const char *name, const char *enum_name)
return -1;
}
/* set a control, potentially supports several values */
void alsa_controls_set(const char *name, snd_ctl_elem_type_t type,
/* set/get a control, potentially supports several values */
void alsa_controls_get_set(bool get, const char *name, snd_ctl_elem_type_t type,
unsigned nr_values, long *val)
{
snd_ctl_elem_id_t *id;
@ -132,21 +132,54 @@ void alsa_controls_set(const char *name, snd_ctl_elem_type_t type,
if(snd_ctl_elem_info_get_count(info) != nr_values)
panicf("Control '%s' has wrong count (got %u, expected %u)",
name, snd_ctl_elem_info_get_count(info), nr_values);
/* set value */
snd_ctl_elem_value_set_id(value, id);
for(unsigned i = 0; i < nr_values; i++)
/* set value */
if(get)
{
/* ALSA is braindead: there are "typed" setters but they all take long anyway */
if(type == SND_CTL_ELEM_TYPE_BOOLEAN)
snd_ctl_elem_value_set_boolean(value, i, val[i]);
else if(type == SND_CTL_ELEM_TYPE_INTEGER)
snd_ctl_elem_value_set_integer(value, i, val[i]);
else if(type == SND_CTL_ELEM_TYPE_ENUMERATED)
snd_ctl_elem_value_set_enumerated(value, i, val[i]);
/* read value */
if(snd_ctl_elem_read(alsa_ctl, value) < 0)
panicf("Cannot read control '%s'", name);
for(unsigned i = 0; i < nr_values; i++)
{
/* ALSA is braindead: there are "typed" setters but they all take long anyway */
if(type == SND_CTL_ELEM_TYPE_BOOLEAN)
val[i] = snd_ctl_elem_value_get_boolean(value, i);
else if(type == SND_CTL_ELEM_TYPE_INTEGER)
val[i] = snd_ctl_elem_value_get_integer(value, i);
else if(type == SND_CTL_ELEM_TYPE_ENUMERATED)
val[i] = snd_ctl_elem_value_get_enumerated(value, i);
}
}
/* write value */
if(snd_ctl_elem_write(alsa_ctl, value) < 0)
panicf("Cannot write control '%s'", name);
else
{
for(unsigned i = 0; i < nr_values; i++)
{
/* ALSA is braindead: there are "typed" setters but they all take long anyway */
if(type == SND_CTL_ELEM_TYPE_BOOLEAN)
snd_ctl_elem_value_set_boolean(value, i, val[i]);
else if(type == SND_CTL_ELEM_TYPE_INTEGER)
snd_ctl_elem_value_set_integer(value, i, val[i]);
else if(type == SND_CTL_ELEM_TYPE_ENUMERATED)
snd_ctl_elem_value_set_enumerated(value, i, val[i]);
}
/* write value */
if(snd_ctl_elem_write(alsa_ctl, value) < 0)
panicf("Cannot write control '%s'", name);
}
}
/* set a control, potentially supports several values */
void alsa_controls_set(const char *name, snd_ctl_elem_type_t type,
unsigned nr_values, long *val)
{
return alsa_controls_get_set(false, name, type, nr_values, val);
}
/* get a control, potentially supports several values */
void alsa_controls_get(const char *name, snd_ctl_elem_type_t type,
unsigned nr_values, long *val)
{
return alsa_controls_get_set(true, name, type, nr_values, val);
}
/* get control information */
@ -188,3 +221,11 @@ void alsa_controls_set_ints(const char *name, int count, long *val)
{
return alsa_controls_set(name, SND_CTL_ELEM_TYPE_INTEGER, count, val);
}
/* helper function: get a control with a single boolean value */
bool alsa_controls_get_bool(const char *name)
{
long lval = 0;
alsa_controls_get(name, SND_CTL_ELEM_TYPE_BOOLEAN, 1, &lval);
return lval != 0;
}

8
firmware/target/hosted/alsa-controls.h
View file

@ -31,6 +31,9 @@ void alsa_controls_init(void);
/* close alsa controls */
void alsa_controls_close(void);
/* NOTE: all the following functions panic on error. This behaviour could be changed with the
* functions returning proper values but that would make errors happen silently */
/* find a control element ID by name, return false of not found, the id needs
* to be allocated */
bool alsa_controls_find(snd_ctl_elem_id_t *id, const char *name);
@ -49,5 +52,10 @@ void alsa_controls_set_bool(const char *name, bool val);
void alsa_controls_set_enum(const char *name, const char *enum_name);
/* helper function: set a control with one or more integers */
void alsa_controls_set_ints(const char *name, int count, long *val);
/* get a control value, potentially supports several values */
void alsa_controls_get(const char *name, snd_ctl_elem_type_t type,
unsigned nr_values, long *val);
/* helper function: set a control with a single boolean value */
bool alsa_controls_get_bool(const char *name);
#endif /* __ALSA_CONTROLS_RB_H__ */