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Commit 4be77a53 authored by Dimitris Papastamos's avatar Dimitris Papastamos Committed by Takashi Iwai
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ALSA: pcm: Add snd_pcm_rate_bit_to_rate() 



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: default avatarDimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 989b0138

include/sound/pcm.h

+1 −0
Original line number Diff line number Diff line
@@ -893,6 +893,7 @@ 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)

sound/core/pcm_misc.c

+18 −0
Original line number Diff line number Diff line
@@ -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);