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| author | Clemens Ladisch <clemens@ladisch.de> | 2007-08-13 17:40:54 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@perex.cz> | 2007-10-16 15:58:54 +0200 |
| commit | 918f3a0e8cf67b5db966516f255eaf24d814fac0 (patch) | |
| tree | ae4ac300f4ca93346d4b4ca9a22d760c87ab3072 /sound/core/pcm_misc.c | |
| parent | 7653d557606c7cae921557a6a0ebb7c510e458eb (diff) | |
| download | linux-918f3a0e8cf67b5db966516f255eaf24d814fac0.tar.bz2 | |
[ALSA] pcm: add snd_pcm_rate_to_rate_bit() helper
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>
Diffstat (limited to 'sound/core/pcm_misc.c')
| -rw-r--r-- | sound/core/pcm_misc.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c index afd1e4929755..e5f25ae73ee2 100644 --- a/sound/core/pcm_misc.c +++ b/sound/core/pcm_misc.c @@ -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); |