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pcm: Introduce snd_pcm_subformat_value()

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Allow userspace applications to select subformats easily just like in
snd_pcm_format_t case - by string conversion.

Closes: https://github.com/alsa-project/alsa-lib/pull/342
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Cezary Rojewski 2023-08-04 10:07:19 +02:00 • committed by Jaroslav Kysela
parent ed6b07084b
commit f33284e85e
2 changed files with 27 additions and 0 deletions
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3
include/pcm.h
View file

@ -282,6 +282,8 @@ typedef enum _snd_pcm_format {
/** PCM sample subformat */
typedef enum _snd_pcm_subformat {
/** Unknown */
SND_PCM_SUBFORMAT_UNKNOWN = -1,
/** Standard */
SND_PCM_SUBFORMAT_STD = 0,
SND_PCM_SUBFORMAT_LAST = SND_PCM_SUBFORMAT_STD
@ -1092,6 +1094,7 @@ const char *snd_pcm_format_name(const snd_pcm_format_t format);
const char *snd_pcm_format_description(const snd_pcm_format_t format);
const char *snd_pcm_subformat_name(const snd_pcm_subformat_t subformat);
const char *snd_pcm_subformat_description(const snd_pcm_subformat_t subformat);
snd_pcm_subformat_t snd_pcm_subformat_value(const char* name);
snd_pcm_format_t snd_pcm_format_value(const char* name);
const char *snd_pcm_tstamp_mode_name(const snd_pcm_tstamp_t mode);
const char *snd_pcm_state_name(const snd_pcm_state_t state);

24
src/pcm/pcm.c
View file

@ -2197,6 +2197,30 @@ const char *snd_pcm_subformat_description(const snd_pcm_subformat_t subformat)
return snd_pcm_subformat_descriptions[subformat];
}
/**
* \brief get PCM sample subformat from name
* \param name PCM sample subformat name (case insensitive)
* \return PCM sample subformat
*/
snd_pcm_subformat_t snd_pcm_subformat_value(const char* name)
{
snd_pcm_subformat_t subformat;
for (subformat = 0; subformat <= SND_PCM_SUBFORMAT_LAST; subformat++) {
if (snd_pcm_subformat_names[subformat] &&
!strcasecmp(name, snd_pcm_subformat_names[subformat]))
return subformat;
}
for (subformat = 0; subformat <= SND_PCM_SUBFORMAT_LAST; subformat++) {
if (snd_pcm_subformat_descriptions[subformat] &&
!strcasecmp(name, snd_pcm_subformat_descriptions[subformat]))
return subformat;
}
return SND_PCM_SUBFORMAT_UNKNOWN;
}
/**
* \brief (DEPRECATED) get name of PCM start mode setting
* \param mode PCM start mode