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alsa-mixer: Accept negative max_dB when using decibel fixes

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Sometimes decibel fixes are used as a trick to set a maximum hardware
volume, and in these cases max_dB may be negative yet still valid.
Here's an example:
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/292#note_671300

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/447>
This commit is contained in:
Tanu Kaskinen 2021-01-18 17:36:20 +02:00
parent 10ac01a206
commit ac7f2d96c7
1 changed files with 1 additions and 1 deletions
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2
src/modules/alsa/alsa-mixer.c
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@ -1712,7 +1712,7 @@ static bool element_probe_volume(pa_alsa_element *e, snd_mixer_elem_t *me) {
e->has_dB = snd_mixer_selem_get_capture_dB_range(me, &min_dB, &max_dB) >= 0; e->has_dB = snd_mixer_selem_get_capture_dB_range(me, &min_dB, &max_dB) >= 0;
/* Assume decibel data to be incorrect if max_dB is negative. */ /* Assume decibel data to be incorrect if max_dB is negative. */
if (e->has_dB && max_dB < 0) { if (e->has_dB && max_dB < 0 && !e->db_fix) {
pa_alsa_mixer_id_to_string(buf, sizeof(buf), &e->alsa_id); pa_alsa_mixer_id_to_string(buf, sizeof(buf), &e->alsa_id);
pa_log_warn("The decibel volume range for element %s (%li dB - %li dB) has negative maximum. " pa_log_warn("The decibel volume range for element %s (%li dB - %li dB) has negative maximum. "
"Disabling the decibel range.", buf, min_dB, max_dB); "Disabling the decibel range.", buf, min_dB, max_dB);