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alsa-mixer: Check that the kernel driver returns consistent limits with both snd_mixer_selem_get_*_dB_range() and _ask_*_vol_dB().

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The check is inspired by a driver that returned higher dB limit from
snd_mixer_selem_get_playback_dB_range() than what _ask_playback_vol_dB()
returned at maximum integer volume.
This commit is contained in:
Tanu Kaskinen 2011-03-22 12:23:19 +02:00 • committed by Colin Guthrie
parent 44623a347d
commit fce93eb625
1 changed files with 37 additions and 0 deletions
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37
src/modules/alsa/alsa-mixer.c
View file

@ -1398,6 +1398,43 @@ static int element_probe(pa_alsa_element *e, snd_mixer_t *m) {
else
e->has_dB = snd_mixer_selem_get_capture_dB_range(me, &min_dB, &max_dB) >= 0;
/* Check that the kernel driver returns consistent limits with
* both _get_*_dB_range() and _ask_*_vol_dB(). */
if (e->has_dB && !e->db_fix) {
long min_dB_checked = 0;
long max_dB_checked = 0;
if (e->direction == PA_ALSA_DIRECTION_OUTPUT)
r = snd_mixer_selem_ask_playback_vol_dB(me, e->min_volume, &min_dB_checked);
else
r = snd_mixer_selem_ask_capture_vol_dB(me, e->min_volume, &min_dB_checked);
if (r < 0) {
pa_log_warn("Failed to query the dB value for %s at volume level %li", e->alsa_name, e->min_volume);
return -1;
}
if (e->direction == PA_ALSA_DIRECTION_OUTPUT)
r = snd_mixer_selem_ask_playback_vol_dB(me, e->max_volume, &max_dB_checked);
else
r = snd_mixer_selem_ask_capture_vol_dB(me, e->max_volume, &max_dB_checked);
if (r < 0) {
pa_log_warn("Failed to query the dB value for %s at volume level %li", e->alsa_name, e->max_volume);
return -1;
}
if (min_dB != min_dB_checked || max_dB != max_dB_checked) {
pa_log_warn("Your kernel driver is broken: the reported dB range for %s (from %0.2f dB to %0.2f dB) "
"doesn't match the dB values at minimum and maximum volume levels: %0.2f dB at level %li, "
"%0.2f dB at level %li.",
e->alsa_name,
min_dB / 100.0, max_dB / 100.0,
min_dB_checked / 100.0, e->min_volume, max_dB_checked / 100.0, e->max_volume);
return -1;
}
}
if (e->has_dB) {
#ifdef HAVE_VALGRIND_MEMCHECK_H
VALGRIND_MAKE_MEM_DEFINED(&min_dB, sizeof(min_dB));