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Export dB conversion helper functions

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Export helper functions to convert dB level and range.

snd_tlv_*dB*() are to convert dB level or range directly from TLV data.
snd_ctl_*dB*() are to get dB level or range from a control element.
This commit is contained in:
Takashi Iwai 2007-10-24 13:04:14 +02:00
parent 631f7cde82
commit f38e5feca3
5 changed files with 469 additions and 265 deletions
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15
include/control.h
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@ -442,6 +442,21 @@ const void * snd_ctl_elem_value_get_bytes(const snd_ctl_elem_value_t *obj);
void snd_ctl_elem_value_get_iec958(const snd_ctl_elem_value_t *obj, snd_aes_iec958_t *ptr);
void snd_ctl_elem_value_set_iec958(snd_ctl_elem_value_t *obj, const snd_aes_iec958_t *ptr);
int snd_tlv_parse_dB_info(unsigned int *tlv, unsigned int tlv_size,
unsigned int **db_tlvp);
int snd_tlv_get_dB_range(unsigned int *tlv, long rangemin, long rangemax,
long *min, long *max);
int snd_tlv_convert_to_dB(unsigned int *tlv, long rangemin, long rangemax,
long volume, long *db_gain);
int snd_tlv_convert_from_dB(unsigned int *tlv, long rangemin, long rangemax,
long db_gain, long *value, int xdir);
int snd_ctl_get_dB_range(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
long *min, long *max);
int snd_ctl_convert_to_dB(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
long volume, long *db_gain);
int snd_ctl_convert_from_dB(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
long db_gain, long *value, int xdir);
/**
* \defgroup HControl High level Control Interface
* \ingroup Control