From 918f3a0e8cf67b5db966516f255eaf24d814fac0 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Mon, 13 Aug 2007 17:40:54 +0200 Subject: [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 Signed-off-by: Jaroslav Kysela --- sound/core/pcm_misc.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'sound/core') 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); -- cgit v1.2.3