/* * 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 #include #include #include 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); } 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); 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(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); } 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); 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(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); } 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; } EXPORT_SYMBOL_GPL(snd_pcm_hw_constraint_eld); nput type='hidden' name='id' value='51964e9e12d0a054002a1a0d1dec4f661c7aaf28'/>

path: root/sound/soc/codecs/wm8804.c

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