aboutsummaryrefslogtreecommitdiff
path: root/sound/core
diff options
context:
space:
mode:
authorClemens Ladisch <clemens@ladisch.de>2007-08-13 17:40:54 +0200
committerJaroslav Kysela <perex@perex.cz>2007-10-16 15:58:54 +0200
commit918f3a0e8cf67b5db966516f255eaf24d814fac0 (patch)
treeae4ac300f4ca93346d4b4ca9a22d760c87ab3072 /sound/core
parent7653d557606c7cae921557a6a0ebb7c510e458eb (diff)
downloadlinux-918f3a0e8cf67b5db966516f255eaf24d814fac0.tar.gz
[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')
-rw-r--r--sound/core/pcm_misc.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c
index afd1e492975..e5f25ae73ee 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);