Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d5b702a6 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Takashi Iwai
Browse files

ALSA: pcm: add snd_pcm_hw_rule_noresample() 



Add a helper function to allow drivers to disable hardware resampling
when the application has specified the SNDRV_PCM_HW_PARAMS_NORESAMPLE
flag.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 84f9df15

include/sound/pcm.h

+2 −0
Original line number Diff line number Diff line
@@ -825,6 +825,8 @@ int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 
int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,

			       unsigned int cond,

			       snd_pcm_hw_param_t var);

int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,

			       unsigned int base_rate);

int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,

			unsigned int cond,

			int var,

sound/core/pcm_lib.c

+26 −0
Original line number Diff line number Diff line
@@ -1399,6 +1399,32 @@ int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 


EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);



static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,

					   struct snd_pcm_hw_rule *rule)

{

	unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;

	struct snd_interval *rate;



	rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);

	return snd_interval_list(rate, 1, &base_rate, 0);

}



/**

 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling

 * @runtime: PCM runtime instance

 * @base_rate: the rate at which the hardware does not resample

 */

int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,

			       unsigned int base_rate)

{

	return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,

				   SNDRV_PCM_HW_PARAM_RATE,

				   snd_pcm_hw_rule_noresample_func,

				   (void *)(uintptr_t)base_rate,

				   SNDRV_PCM_HW_PARAM_RATE, -1);

}

EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);



static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,

				  snd_pcm_hw_param_t var)

{