At Fri, 15 Jun 2012 16:35:28 +0100, Dimitris Papastamos wrote:
This is essentially the reverse of snd_pcm_rate_to_rate_bit().
This is generally useful as the Compress API uses the rate bit directly and it helps to be able to map back to the actual sample rate.
Signed-off-by: Dimitris Papastamos dp@opensource.wolfsonmicro.com
Applied to topic/misc branch of sound git tree. If this change is necessary, simply pull that branch.
thanks,
Takashi
include/sound/pcm.h | 1 + sound/core/pcm_misc.c | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 1d58d79..18ad1f1 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -892,6 +892,7 @@ 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);
static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, struct snd_dma_buffer *bufp) diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c index 9c9eff9..d4fc1bf 100644 --- a/sound/core/pcm_misc.c +++ b/sound/core/pcm_misc.c @@ -488,3 +488,21 @@ unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate) return SNDRV_PCM_RATE_KNOT; } EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit);
+/**
- snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate
- @rate_bit: the rate bit to convert
- Returns the sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag
- or 0 for an unknown rate bit
- */
+unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit) +{
- unsigned int i;
- for (i = 0; i < snd_pcm_known_rates.count; i++)
if ((1u << i) == rate_bit)return snd_pcm_known_rates.list[i];- return 0;
+}
+EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate);
1.7.10.4
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