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control: better docs for snd_ctl_elem_id_compare()

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
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Jaroslav Kysela 2021-03-08 15:24:31 +01:00
parent 8bd9e7897d
commit 266618088a
1 changed files with 10 additions and 1 deletions
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11
src/control/control.c
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@ -1822,7 +1822,16 @@ void snd_ctl_elem_id_copy(snd_ctl_elem_id_t *dst, const snd_ctl_elem_id_t *src)
* \brief compare one #snd_ctl_elem_id_t to another * \brief compare one #snd_ctl_elem_id_t to another
* \param id1 pointer to first id * \param id1 pointer to first id
* \param id2 pointer to second id * \param id2 pointer to second id
* \retval zero when values are identical, -1 first id * \retval zero when values are identical, other value on a difference (like strcmp)
*
* This comparison ignores the numid part. The numid comparison can be easily
* implemented using snd_ctl_elem_id_get_numid() calls.
*
* The identifier fields are compared in this order: interface, device,
* subdevice, name, index.
*
* The return value can be used for sorting like qsort(). It gives persistent
* results.
*/ */
int snd_ctl_elem_id_compare(snd_ctl_elem_id_t *id1, const snd_ctl_elem_id_t *id2) int snd_ctl_elem_id_compare(snd_ctl_elem_id_t *id1, const snd_ctl_elem_id_t *id2)
{ {