[PATCH] ALSA: Add snd_pcm_rate_bit_to_rate()

[PATCH] ALSA: Add snd_pcm_rate_bit_to_rate()

[Dimitris Papastamos]

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>
---
 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

Re: [PATCH] ALSA: Add snd_pcm_rate_bit_to_rate()

[Takashi Iwai]

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
> 
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> 

Re: [PATCH] ALSA: Add snd_pcm_rate_bit_to_rate()

[Dimitris Papastamos]

On Mon, Jun 18, 2012 at 09:44:19AM +0200, Takashi Iwai wrote:
> 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!