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authorLars-Peter Clausen <lars@metafoo.de>2014-01-11 10:24:43 +0100
committerMark Brown <broonie@linaro.org>2014-01-14 20:42:34 +0000
commite3a9269f874067fcefc5eb8037466161fb0fe3f4 (patch)
tree5d5d71d96c19cd786fd14e2ccfe50d22ab962c3a /include/sound/pcm.h
parentbf103eb4af73596edbab5faab67e29ea1e87c769 (diff)
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ALSA: Add helper function for intersecting two rate masks
A bit of special care is necessary when creating the intersection of two rate masks. This comes from the special meaning of the SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT bits, which needs special handling when intersecting two rate masks. SNDRV_PCM_RATE_CONTINUOUS means the hardware supports all rates in a specific interval. SNDRV_PCM_RATE_KNOT means the hardware supports a set of discrete rates specified by a list constraint. For all other cases the supported rates are specified directly in the rate mask. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'include/sound/pcm.h')
-rw-r--r--include/sound/pcm.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 84b10f9a2832..d0170913374d 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -901,6 +901,8 @@ extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
+unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
+ unsigned int rates_b);
static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
struct snd_dma_buffer *bufp)