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alsa: mixer - use safe dB range values when the override mask is unset

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Use safe values for the min_dB and max_dB fields when the position mask
is unset to avoid breakage for the upper levels.

If the range is incorrect, the volume range shown in pavucontrol shows
strange values.

(Thanks to Wim Taymans for the idea.)

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/389>
This commit is contained in:
Jaroslav Kysela 2020-10-24 18:20:59 +02:00 • committed by Arun Raghavan
parent d1e0594e93
commit de9299c7b7
1 changed files with 16 additions and 3 deletions
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19
src/modules/alsa/alsa-mixer.c
View file

@ -3017,6 +3017,7 @@ int pa_alsa_path_probe(pa_alsa_path *p, pa_alsa_mapping *mapping, snd_mixer_t *m
double min_dB[PA_CHANNEL_POSITION_MAX], max_dB[PA_CHANNEL_POSITION_MAX];
pa_channel_position_t t;
pa_channel_position_mask_t path_volume_channels = 0;
bool min_dB_set, max_dB_set;
char buf[64];
pa_assert(p);
@ -3047,7 +3048,7 @@ int pa_alsa_path_probe(pa_alsa_path *p, pa_alsa_mapping *mapping, snd_mixer_t *m
pa_log_debug("Probe of element %s failed.", buf);
return -1;
}
pa_log_debug("Probe of element %s succeeded (volume=%d, switch=%d, enumeration=%d).", buf, e->volume_use, e->switch_use, e->enumeration_use);
pa_log_debug("Probe of element %s succeeded (volume=%d, switch=%d, enumeration=%d, has_dB=%d).", buf, e->volume_use, e->switch_use, e->enumeration_use, e->has_dB);
if (ignore_dB)
e->has_dB = false;
@ -3111,18 +3112,30 @@ int pa_alsa_path_probe(pa_alsa_path *p, pa_alsa_mapping *mapping, snd_mixer_t *m
p->supported = true;
p->min_dB = INFINITY;
min_dB_set = false;
p->max_dB = -INFINITY;
max_dB_set = false;
for (t = 0; t < PA_CHANNEL_POSITION_MAX; t++) {
if (path_volume_channels & PA_CHANNEL_POSITION_MASK(t)) {
if (p->min_dB > min_dB[t])
if (p->min_dB > min_dB[t]) {
p->min_dB = min_dB[t];
min_dB_set = true;
}
if (p->max_dB < max_dB[t])
if (p->max_dB < max_dB[t]) {
p->max_dB = max_dB[t];
max_dB_set = true;
}
}
}
/* this is probably a wrong prediction, but it should be safe */
if (!min_dB_set)
p->min_dB = -INFINITY;
if (!max_dB_set)
p->max_dB = 0;
return 0;
}