cregit-Linux how code gets into the kernel

Release 4.13 sound/core/pcm_drm_eld.c

Directory: sound/core
/*
 *  PCM DRM helpers
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2 as
 *   published by the Free Software Foundation.
 */
#include <linux/export.h>
#include <drm/drm_edid.h>
#include <sound/pcm.h>
#include <sound/pcm_drm_eld.h>


static const unsigned int eld_rates[] = {
	32000,
	44100,
	48000,
	88200,
	96000,
	176400,
	192000,
};


static unsigned int sad_max_channels(const u8 *sad) { return 1 + (sad[0] & 7); }

Contributors

PersonTokensPropCommitsCommitProp
Russell King24100.00%1100.00%
Total24100.00%1100.00%


static int eld_limit_rates(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval *r = hw_param_interval(params, rule->var); const struct snd_interval *c; unsigned int rate_mask = 7, i; const u8 *sad, *eld = rule->private; sad = drm_eld_sad(eld); if (sad) { c = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); for (i = drm_eld_sad_count(eld); i > 0; i--, sad += 3) { unsigned max_channels = sad_max_channels(sad); /* * Exclude SADs which do not include the * requested number of channels. */ if (c->min <= max_channels) rate_mask |= sad[1]; } } return snd_interval_list(r, ARRAY_SIZE(eld_rates), eld_rates, rate_mask); }

Contributors

PersonTokensPropCommitsCommitProp
Russell King13798.56%150.00%
Takashi Sakamoto21.44%150.00%
Total139100.00%2100.00%


static int eld_limit_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval *c = hw_param_interval(params, rule->var); const struct snd_interval *r; struct snd_interval t = { .min = 1, .max = 2, .integer = 1, }; unsigned int i; const u8 *sad, *eld = rule->private; sad = drm_eld_sad(eld); if (sad) { unsigned int rate_mask = 0; /* Convert the rate interval to a mask */ r = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); for (i = 0; i < ARRAY_SIZE(eld_rates); i++) if (r->min <= eld_rates[i] && r->max >= eld_rates[i]) rate_mask |= BIT(i); for (i = drm_eld_sad_count(eld); i > 0; i--, sad += 3) if (rate_mask & sad[1]) t.max = max(t.max, sad_max_channels(sad)); } return snd_interval_refine(c, &t); }

Contributors

PersonTokensPropCommitsCommitProp
Russell King19798.99%150.00%
Takashi Sakamoto21.01%150.00%
Total199100.00%2100.00%


int snd_pcm_hw_constraint_eld(struct snd_pcm_runtime *runtime, void *eld) { int ret; ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, eld_limit_rates, eld, SNDRV_PCM_HW_PARAM_CHANNELS, -1); if (ret < 0) return ret; ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, eld_limit_channels, eld, SNDRV_PCM_HW_PARAM_RATE, -1); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Russell King69100.00%1100.00%
Total69100.00%1100.00%

EXPORT_SYMBOL_GPL(snd_pcm_hw_constraint_eld);

Overall Contributors

PersonTokensPropCommitsCommitProp
Russell King46899.15%150.00%
Takashi Sakamoto40.85%150.00%
Total472100.00%2100.00%
Directory: sound/core
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.