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[ALSA] pcm: add snd_pcm_rate_to_rate_bit() helper

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Add a snd_pcm_rate_to_rate_bit() function to factor out common code used
by several drivers.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Clemens Ladisch
2007-08-13 17:40:54 +02:00
committed by Jaroslav Kysela
parent 7653d55760
commit 918f3a0e8c
8 changed files with 47 additions and 145 deletions
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18
sound/core/pcm_misc.c
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@@ -450,3 +450,21 @@ int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
}
EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
/**
* snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
* @rate: the sample rate to convert
*
* Returns the SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or
* SNDRV_PCM_RATE_KNOT for an unknown rate.
*/
unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate)
{
unsigned int i;
for (i = 0; i < snd_pcm_known_rates.count; i++)
if (snd_pcm_known_rates.list[i] == rate)
return 1u << i;
return SNDRV_PCM_RATE_KNOT;
}
EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);