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https://github.com/alsa-project/alsa-lib.git
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ctl: improve comments for handling element data
Some parts of control API documentation are described with core-developer friendly explanations. To usual developer such as me, they're quite hard to understand. This commit improves such comments for a part of APIs to handle data of each element. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto
Takashi Iwai
parent
f3c24de8c0
commit
90020c05f8
1 changed files with 131 additions and 115 deletions
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@ -482,7 +482,7 @@ int snd_ctl_elem_remove(snd_ctl_t *ctl, snd_ctl_elem_id_t *id)
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/**
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* \brief Get CTL element value
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* \param ctl CTL handle
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* \param control CTL element id/value pointer
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* \param obj Data of an element.
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* \return 0 on success otherwise a negative error code
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*/
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int snd_ctl_elem_read(snd_ctl_t *ctl, snd_ctl_elem_value_t *control)
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@ -494,7 +494,7 @@ int snd_ctl_elem_read(snd_ctl_t *ctl, snd_ctl_elem_value_t *control)
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/**
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* \brief Set CTL element value
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* \param ctl CTL handle
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* \param control CTL element id/value pointer
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* \param obj Data of an element.
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* \retval 0 on success
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* \retval >0 on success when value was changed
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* \retval <0 a negative error code
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@ -2295,8 +2295,8 @@ void snd_ctl_elem_info_set_index(snd_ctl_elem_info_t *obj, unsigned int val)
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}
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/**
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* \brief get size of #snd_ctl_elem_value_t
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* \return size in bytes
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* \brief Get size of data structure for an element.
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* \return Size in bytes.
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*/
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size_t snd_ctl_elem_value_sizeof()
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{
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@ -2304,9 +2304,9 @@ size_t snd_ctl_elem_value_sizeof()
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}
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/**
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* \brief allocate an invalid #snd_ctl_elem_value_t using standard malloc
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* \param ptr returned pointer
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* \return 0 on success otherwise negative error code
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* \brief Allocate an invalid #snd_ctl_elem_value_t using standard malloc(3).
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* \param ptr Returned pointer for data of an element.
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* \return 0 on success otherwise negative error code.
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*/
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int snd_ctl_elem_value_malloc(snd_ctl_elem_value_t **ptr)
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{
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@ -2318,8 +2318,8 @@ int snd_ctl_elem_value_malloc(snd_ctl_elem_value_t **ptr)
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}
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/**
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* \brief frees a previously allocated #snd_ctl_elem_value_t
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* \param obj pointer to object to free
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* \brief Frees a previously allocated data of an element.
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* \param obj Data of an element.
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*/
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void snd_ctl_elem_value_free(snd_ctl_elem_value_t *obj)
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{
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@ -2327,8 +2327,8 @@ void snd_ctl_elem_value_free(snd_ctl_elem_value_t *obj)
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}
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/**
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* \brief clear given #snd_ctl_elem_value_t object
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* \param obj pointer to object to clear
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* \brief Clear given data of an element.
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* \param obj Data of an element.
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*/
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void snd_ctl_elem_value_clear(snd_ctl_elem_value_t *obj)
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{
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@ -2336,32 +2336,34 @@ void snd_ctl_elem_value_clear(snd_ctl_elem_value_t *obj)
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}
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/**
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* \brief copy one #snd_ctl_elem_value_t to another
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* \param dst pointer to destination
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* \param src pointer to source
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* \brief Copy two data of elements.
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* \param dst Pointer to destination.
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* \param src Pointer to source.
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*/
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void snd_ctl_elem_value_copy(snd_ctl_elem_value_t *dst, const snd_ctl_elem_value_t *src)
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void snd_ctl_elem_value_copy(snd_ctl_elem_value_t *dst,
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const snd_ctl_elem_value_t *src)
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{
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assert(dst && src);
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*dst = *src;
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}
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/**
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* \brief compare one #snd_ctl_elem_value_t to another
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* \param left pointer to first value
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* \param right pointer to second value
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* \return 0 on match, less than or greater than otherwise, see memcmp
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* \brief Compare one data of an element to the other.
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* \param left Pointer to first data.
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* \param right Pointer to second data.
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* \return 0 on match, less than or greater than otherwise, see memcmp(3).
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*/
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int snd_ctl_elem_value_compare(snd_ctl_elem_value_t *left, const snd_ctl_elem_value_t *right)
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int snd_ctl_elem_value_compare(snd_ctl_elem_value_t *left,
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const snd_ctl_elem_value_t *right)
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{
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assert(left && right);
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return memcmp(left, right, sizeof(*left));
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}
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/**
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* \brief Get CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \param ptr Pointer to returned CTL element identifier
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* \brief Get element identifier from given data of an element.
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* \param obj Data of an element.
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* \param ptr Pointer for element identifier.
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*/
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void snd_ctl_elem_value_get_id(const snd_ctl_elem_value_t *obj, snd_ctl_elem_id_t *ptr)
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{
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@ -2370,9 +2372,9 @@ void snd_ctl_elem_value_get_id(const snd_ctl_elem_value_t *obj, snd_ctl_elem_id_
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}
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/**
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* \brief Get element numeric identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \return element numeric identifier
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* \brief Get element numeric identifier from given data of an element.
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* \param obj Data of an element.
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* \return Element numeric identifier.
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*/
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unsigned int snd_ctl_elem_value_get_numid(const snd_ctl_elem_value_t *obj)
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{
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@ -2381,9 +2383,10 @@ unsigned int snd_ctl_elem_value_get_numid(const snd_ctl_elem_value_t *obj)
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}
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/**
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* \brief Get interface part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \return interface part of element identifier
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* \brief Get interface part of element identifier from given data of an
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* element.
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* \param obj Data of an element.
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* \return Interface part of element identifier.
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*/
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snd_ctl_elem_iface_t snd_ctl_elem_value_get_interface(const snd_ctl_elem_value_t *obj)
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{
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@ -2392,9 +2395,9 @@ snd_ctl_elem_iface_t snd_ctl_elem_value_get_interface(const snd_ctl_elem_value_t
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}
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/**
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* \brief Get device part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \return device part of element identifier
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* \brief Get device part of element identifier from given data of an element.
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* \param obj Data of an element.
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* \return Device part of element identifier.
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*/
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unsigned int snd_ctl_elem_value_get_device(const snd_ctl_elem_value_t *obj)
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{
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@ -2403,9 +2406,10 @@ unsigned int snd_ctl_elem_value_get_device(const snd_ctl_elem_value_t *obj)
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}
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/**
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* \brief Get subdevice part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \return subdevice part of element identifier
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* \brief Get subdevice part of element identifier from given data of an
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* element.
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* \param obj Data of an element.
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* \return Subdevice part of element identifier.
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*/
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unsigned int snd_ctl_elem_value_get_subdevice(const snd_ctl_elem_value_t *obj)
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{
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@ -2414,9 +2418,9 @@ unsigned int snd_ctl_elem_value_get_subdevice(const snd_ctl_elem_value_t *obj)
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}
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/**
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* \brief Get name part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \return name part of element identifier
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* \brief Get name part of element identifier from given data of an element.
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* \param obj Data of an element.
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* \return Name part of element identifier.
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*/
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const char *snd_ctl_elem_value_get_name(const snd_ctl_elem_value_t *obj)
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{
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@ -2425,9 +2429,9 @@ const char *snd_ctl_elem_value_get_name(const snd_ctl_elem_value_t *obj)
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}
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/**
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* \brief Get index part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \return index part of element identifier
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* \brief Get index part of element identifier from given data of an element.
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* \param obj Data of an element.
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* \return Index part of element identifier.
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*/
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unsigned int snd_ctl_elem_value_get_index(const snd_ctl_elem_value_t *obj)
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{
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@ -2436,9 +2440,9 @@ unsigned int snd_ctl_elem_value_get_index(const snd_ctl_elem_value_t *obj)
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}
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/**
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* \brief Set CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \param ptr CTL element identifier
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* \brief Set element identifier to given data of an element.
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* \param obj Data of an element.
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* \param ptr Pointer to an element identifier.
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*/
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void snd_ctl_elem_value_set_id(snd_ctl_elem_value_t *obj, const snd_ctl_elem_id_t *ptr)
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{
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@ -2447,9 +2451,9 @@ void snd_ctl_elem_value_set_id(snd_ctl_elem_value_t *obj, const snd_ctl_elem_id_
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}
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/**
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* \brief Set element numeric identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \param val element numeric identifier
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* \brief Set numeric identifier to given data of an element.
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* \param obj Data of an element.
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* \param val Value for numeric identifier.
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*/
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void snd_ctl_elem_value_set_numid(snd_ctl_elem_value_t *obj, unsigned int val)
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{
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@ -2458,9 +2462,9 @@ void snd_ctl_elem_value_set_numid(snd_ctl_elem_value_t *obj, unsigned int val)
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}
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/**
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* \brief Set interface part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \param val interface part of element identifier
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* \brief Set interface part of element identifier to given data of an element.
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* \param obj Data of an element.
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* \param val Value for interface part of element identifier.
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*/
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void snd_ctl_elem_value_set_interface(snd_ctl_elem_value_t *obj, snd_ctl_elem_iface_t val)
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{
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@ -2469,9 +2473,9 @@ void snd_ctl_elem_value_set_interface(snd_ctl_elem_value_t *obj, snd_ctl_elem_if
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}
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/**
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* \brief Set device part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \param val device part of element identifier
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* \brief Set device part of element identifier to given data of an element.
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* \param obj Data of an element.
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* \param val Value for device part of element identifier.
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*/
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void snd_ctl_elem_value_set_device(snd_ctl_elem_value_t *obj, unsigned int val)
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{
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@ -2480,9 +2484,9 @@ void snd_ctl_elem_value_set_device(snd_ctl_elem_value_t *obj, unsigned int val)
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}
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/**
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* \brief Set subdevice part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \param val subdevice part of element identifier
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* \brief Set subdevice part of element identifier to given data of an element.
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* \param obj Data of an element.
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* \param val Value for subdevice part of element identifier.
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*/
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void snd_ctl_elem_value_set_subdevice(snd_ctl_elem_value_t *obj, unsigned int val)
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{
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@ -2491,9 +2495,9 @@ void snd_ctl_elem_value_set_subdevice(snd_ctl_elem_value_t *obj, unsigned int va
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}
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/**
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* \brief Set name part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \param val name part of element identifier
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* \brief Set name part of element identifier to given data of an element.
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* \param obj Data of an element.
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* \param val Value for name part of element identifier,
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*/
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void snd_ctl_elem_value_set_name(snd_ctl_elem_value_t *obj, const char *val)
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{
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@ -2502,9 +2506,9 @@ void snd_ctl_elem_value_set_name(snd_ctl_elem_value_t *obj, const char *val)
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}
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/**
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* \brief Set index part of CTL element identifier of a CTL element id/value
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* \param obj CTL element id/value
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* \param val index part of element identifier
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* \brief Set index part of element identifier to given data of an element.
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* \param obj Data of an element.
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* \param val Value for index part of element identifier.
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*/
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void snd_ctl_elem_value_set_index(snd_ctl_elem_value_t *obj, unsigned int val)
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{
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@ -2513,10 +2517,11 @@ void snd_ctl_elem_value_set_index(snd_ctl_elem_value_t *obj, unsigned int val)
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}
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/**
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* \brief Get value for an entry of a #SND_CTL_ELEM_TYPE_BOOLEAN CTL element id/value
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* \param obj CTL element id/value
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* \param idx Entry index
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* \return value for the entry
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* \brief Get value of a specified member from given data as an element of
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* boolean type.
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* \param obj Data of an element.
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* \param idx Index of member in the element.
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* \return Value for the member.
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*/
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int snd_ctl_elem_value_get_boolean(const snd_ctl_elem_value_t *obj, unsigned int idx)
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{
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@ -2526,10 +2531,11 @@ int snd_ctl_elem_value_get_boolean(const snd_ctl_elem_value_t *obj, unsigned int
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}
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/**
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* \brief Get value for an entry of a #SND_CTL_ELEM_TYPE_INTEGER CTL element id/value
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* \param obj CTL element id/value
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* \param idx Entry index
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* \return value for the entry
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* \brief Get value of a specified member from given data as an element of
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* integer type.
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* \param obj Data of an element.
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* \param idx Index of member in the element.
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* \return Value for the member.
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*/
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long snd_ctl_elem_value_get_integer(const snd_ctl_elem_value_t *obj, unsigned int idx)
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{
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@ -2539,10 +2545,11 @@ long snd_ctl_elem_value_get_integer(const snd_ctl_elem_value_t *obj, unsigned in
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}
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/**
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* \brief Get value for an entry of a #SND_CTL_ELEM_TYPE_INTEGER64 CTL element id/value
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* \param obj CTL element id/value
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* \param idx Entry index
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* \return value for the entry
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* \brief Get value of a specified member from given data as an element of
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* integer64 type.
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* \param obj Data of an element.
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* \param idx Index of member in the element.
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* \return Value for the member.
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*/
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long long snd_ctl_elem_value_get_integer64(const snd_ctl_elem_value_t *obj, unsigned int idx)
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{
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@ -2552,10 +2559,11 @@ long long snd_ctl_elem_value_get_integer64(const snd_ctl_elem_value_t *obj, unsi
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}
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/**
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* \brief Get value for an entry of a #SND_CTL_ELEM_TYPE_ENUMERATED CTL element id/value
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* \param obj CTL element id/value
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* \param idx Entry index
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* \return value for the entry
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* \brief Get value of a specified member from given data as an element of
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* enumerated type.
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* \param obj Data of an element.
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* \param idx Index of member in the element.
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* \return Value for the member. This is an index of name set in the element.
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*/
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unsigned int snd_ctl_elem_value_get_enumerated(const snd_ctl_elem_value_t *obj, unsigned int idx)
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{
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@ -2565,10 +2573,11 @@ unsigned int snd_ctl_elem_value_get_enumerated(const snd_ctl_elem_value_t *obj,
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}
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/**
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* \brief Get value for an entry of a #SND_CTL_ELEM_TYPE_BYTES CTL element id/value
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* \param obj CTL element id/value
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* \param idx Entry index
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* \return value for the entry
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* \brief Get value of a specified member from given data as an element of
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* bytes type.
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* \param obj Data of an element.
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* \param idx Index of member in the element.
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* \return Value for the member.
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*/
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unsigned char snd_ctl_elem_value_get_byte(const snd_ctl_elem_value_t *obj, unsigned int idx)
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{
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@ -2578,10 +2587,11 @@ unsigned char snd_ctl_elem_value_get_byte(const snd_ctl_elem_value_t *obj, unsig
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}
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/**
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* \brief Set value for an entry of a #SND_CTL_ELEM_TYPE_BOOLEAN CTL element id/value
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* \param obj CTL element id/value
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* \param idx Entry index
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* \param val value for the entry
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* \brief Set value of a specified member to given data as an element of
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* boolean type.
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* \param obj Data of an element.
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* \param idx Index of member in the element.
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* \param val Value for the member.
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*/
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void snd_ctl_elem_value_set_boolean(snd_ctl_elem_value_t *obj, unsigned int idx, long val)
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{
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@ -2591,10 +2601,11 @@ void snd_ctl_elem_value_set_boolean(snd_ctl_elem_value_t *obj, unsigned int idx,
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}
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/**
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* \brief Set value for an entry of a #SND_CTL_ELEM_TYPE_INTEGER CTL element id/value
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* \param obj CTL element id/value
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* \param idx Entry index
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* \param val value for the entry
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* \brief Set value of a specified member to given data as an element of
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* integer type.
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* \param obj Data of an element.
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* \param idx Index of member in the element.
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* \param val Value for the member.
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*/
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void snd_ctl_elem_value_set_integer(snd_ctl_elem_value_t *obj, unsigned int idx, long val)
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{
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@ -2604,10 +2615,11 @@ void snd_ctl_elem_value_set_integer(snd_ctl_elem_value_t *obj, unsigned int idx,
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}
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||||
|
||||
/**
|
||||
* \brief Set value for an entry of a #SND_CTL_ELEM_TYPE_INTEGER64 CTL element id/value
|
||||
* \param obj CTL element id/value
|
||||
* \param idx Entry index
|
||||
* \param val value for the entry
|
||||
* \brief Set value of a specified member to given data as an element of
|
||||
* integer64 type.
|
||||
* \param obj Data of an element.
|
||||
* \param idx Index of member in the element.
|
||||
* \param val Value for the member.
|
||||
*/
|
||||
void snd_ctl_elem_value_set_integer64(snd_ctl_elem_value_t *obj, unsigned int idx, long long val)
|
||||
{
|
||||
|
|
@ -2617,10 +2629,11 @@ void snd_ctl_elem_value_set_integer64(snd_ctl_elem_value_t *obj, unsigned int id
|
|||
}
|
||||
|
||||
/**
|
||||
* \brief Set value for an entry of a #SND_CTL_ELEM_TYPE_ENUMERATED CTL element id/value
|
||||
* \param obj CTL element id/value
|
||||
* \param idx Entry index
|
||||
* \param val value for the entry
|
||||
* \brief Set value of a specified member to given data as an element of
|
||||
* enumerated type.
|
||||
* \param obj Data of an element.
|
||||
* \param idx Index of member in the element.
|
||||
* \param val Value for the member.
|
||||
*/
|
||||
void snd_ctl_elem_value_set_enumerated(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned int val)
|
||||
{
|
||||
|
|
@ -2630,10 +2643,11 @@ void snd_ctl_elem_value_set_enumerated(snd_ctl_elem_value_t *obj, unsigned int i
|
|||
}
|
||||
|
||||
/**
|
||||
* \brief Set value for an entry of a #SND_CTL_ELEM_TYPE_BYTES CTL element id/value
|
||||
* \param obj CTL element id/value
|
||||
* \param idx Entry index
|
||||
* \param val value for the entry
|
||||
* \brief Set value for a specified member to given data as an element of byte
|
||||
* type.
|
||||
* \param obj Data of an element.
|
||||
* \param idx Index of member in the element.
|
||||
* \param val Value for the member.
|
||||
*/
|
||||
void snd_ctl_elem_value_set_byte(snd_ctl_elem_value_t *obj, unsigned int idx, unsigned char val)
|
||||
{
|
||||
|
|
@ -2643,10 +2657,10 @@ void snd_ctl_elem_value_set_byte(snd_ctl_elem_value_t *obj, unsigned int idx, un
|
|||
}
|
||||
|
||||
/**
|
||||
* \brief Set CTL element #SND_CTL_ELEM_TYPE_BYTES value
|
||||
* \param obj CTL handle
|
||||
* \param data Bytes value
|
||||
* \param size Size in bytes
|
||||
* \brief Set values to given data as an element of bytes type.
|
||||
* \param obj Data of an element.
|
||||
* \param data Pointer for byte array.
|
||||
* \param size The number of bytes included in the memory block.
|
||||
*/
|
||||
void snd_ctl_elem_set_bytes(snd_ctl_elem_value_t *obj, void *data, size_t size)
|
||||
{
|
||||
|
|
@ -2656,9 +2670,9 @@ void snd_ctl_elem_set_bytes(snd_ctl_elem_value_t *obj, void *data, size_t size)
|
|||
}
|
||||
|
||||
/**
|
||||
* \brief Get value for a #SND_CTL_ELEM_TYPE_BYTES CTL element id/value
|
||||
* \param obj CTL element id/value
|
||||
* \return Pointer to CTL element value
|
||||
* \brief Get memory block from given data as an element of bytes type.
|
||||
* \param obj Data of an element.
|
||||
* \return Pointer for byte array.
|
||||
*/
|
||||
const void * snd_ctl_elem_value_get_bytes(const snd_ctl_elem_value_t *obj)
|
||||
{
|
||||
|
|
@ -2667,9 +2681,10 @@ const void * snd_ctl_elem_value_get_bytes(const snd_ctl_elem_value_t *obj)
|
|||
}
|
||||
|
||||
/**
|
||||
* \brief Get value for a #SND_CTL_ELEM_TYPE_IEC958 CTL element id/value
|
||||
* \param obj CTL element id/value
|
||||
* \param ptr Pointer to returned CTL element value
|
||||
* \brief Get value from given data to given pointer as an element of IEC958
|
||||
* type.
|
||||
* \param obj Data of an element.
|
||||
* \param ptr Pointer to IEC958 data.
|
||||
*/
|
||||
void snd_ctl_elem_value_get_iec958(const snd_ctl_elem_value_t *obj, snd_aes_iec958_t *ptr)
|
||||
{
|
||||
|
|
@ -2678,9 +2693,10 @@ void snd_ctl_elem_value_get_iec958(const snd_ctl_elem_value_t *obj, snd_aes_iec9
|
|||
}
|
||||
|
||||
/**
|
||||
* \brief Set value for a #SND_CTL_ELEM_TYPE_IEC958 CTL element id/value
|
||||
* \param obj CTL element id/value
|
||||
* \param ptr Pointer to CTL element value
|
||||
* \brief Set value from given pointer to given data as an element of IEC958
|
||||
* type.
|
||||
* \param obj Data of an element.
|
||||
* \param ptr Pointer to IEC958 data.
|
||||
*/
|
||||
void snd_ctl_elem_value_set_iec958(snd_ctl_elem_value_t *obj, const snd_aes_iec958_t *ptr)
|
||||
{
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue