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Added function, mixer_get_num_ctls_by_name

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This function is used to get the number of mixer controls by a given name.
It was added for use with mixer_get_ctl_by_name_and_index so that client code
can expect the last valid index to pass.
This commit is contained in:
Taylor Holberton
2016-12-01 18:35:24 -08:00
parent 7dc7d83ed7
commit 94c7c83c01
2 changed files with 26 additions and 0 deletions
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include/tinyalsa/mixer.h
+2
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@@ -73,6 +73,8 @@ const char *mixer_get_name(const struct mixer *mixer);
unsigned int mixer_get_num_ctls(const struct mixer *mixer);
unsigned int mixer_get_num_ctls_by_name(const struct mixer *mixer, const char *name);
const struct mixer_ctl *mixer_get_ctl_const(const struct mixer *mixer, unsigned int id);
struct mixer_ctl *mixer_get_ctl(struct mixer *mixer, unsigned int id);
src/mixer.c
+24
View File
@@ -194,6 +194,30 @@ unsigned int mixer_get_num_ctls(const struct mixer *mixer)
return mixer->count;
}
/** Gets the number of mixer controls, that go by a specified name, for a given mixer.
* @param mixer An initialized mixer handle.
* @param name The name of the mixer control
* @returns The number of mixer controls, specified by @p name, for the given mixer.
* @ingroup libtinyalsa-mixer
*/
unsigned int mixer_get_num_ctls_by_name(const struct mixer *mixer, const char *name)
{
unsigned int n;
unsigned int count = 0;
struct mixer_ctl *ctl;
if (!mixer)
return 0;
ctl = mixer->ctl;
for (n = 0; n < mixer->count; n++)
if (!strcmp(name, (char*) ctl[n].info.id.name))
count++;
return count;
}
/** Gets a mixer control handle, by the mixer control's id.
* For non-const access, see @ref mixer_get_ctl
* @param mixer An initialized mixer handle.