diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2014-01-11 10:24:43 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-01-14 20:42:34 +0000 |
| commit | e3a9269f874067fcefc5eb8037466161fb0fe3f4 (patch) | |
| tree | 5d5d71d96c19cd786fd14e2ccfe50d22ab962c3a /include/sound/pcm.h | |
| parent | bf103eb4af73596edbab5faab67e29ea1e87c769 (diff) | |
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.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 84b10f9a283..d0170913374 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) |