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Commit 3bdff244 authored by Mengdong Lin's avatar Mengdong Lin Committed by Mark Brown
Browse files

ALSA: pcm: Add snd_pcm_rate_range_to_bits() 



This helper function can convert a given sample rate range to
SNDRV_PCM_RATE_xxx bits.

Signed-off-by: default avatarMengdong Lin <mengdong.lin@linux.intel.com>
Acked-by: default avatarTakashi Iwai <tiwai@suse.de>
Acked-by: default avatarLiam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 92e963f5

include/sound/pcm.h

+2 −0
Original line number Diff line number Diff line
@@ -1093,6 +1093,8 @@ 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);

unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,

					unsigned int rate_max);



/**

 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer

sound/core/pcm_misc.c

+30 −0
Original line number Diff line number Diff line
@@ -565,3 +565,33 @@ unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, 
	return rates_a & rates_b;

}

EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect);



/**

 * snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit

 * @rate_min: the minimum sample rate

 * @rate_max: the maximum sample rate

 *

 * This function has an implicit assumption: the rates in the given range have

 * only the pre-defined rates like 44100 or 16000.

 *

 * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate range,

 * or SNDRV_PCM_RATE_KNOT for an unknown range.

 */

unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,

	unsigned int rate_max)

{

	unsigned int rates = 0;

	int i;



	for (i = 0; i < snd_pcm_known_rates.count; i++) {

		if (snd_pcm_known_rates.list[i] >= rate_min

			&& snd_pcm_known_rates.list[i] <= rate_max)

			rates |= 1 << i;

	}



	if (!rates)

		rates = SNDRV_PCM_RATE_KNOT;



	return rates;

}

EXPORT_SYMBOL_GPL(snd_pcm_rate_range_to_bits);