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alsa-mixer: support up to 8 channels per mixer element

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We have at least one USB hardware which supports the 8
channels in one mixer element:

  https://github.com/alsa-project/alsa-ucm-conf/pull/25

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2020-05-04 13:04:28 +02:00 • committed by Arun Raghavan
parent 06990e32ff
commit e0ab9fa4a4
2 changed files with 16 additions and 10 deletions
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24
src/modules/alsa/alsa-mixer.c
View file

@ -1794,16 +1794,16 @@ static bool element_probe_volume(pa_alsa_element *e, snd_mixer_elem_t *me) {
alsa_id_str(buf, sizeof(buf), &e->alsa_id);
pa_log_warn("Volume element %s with no channels?", buf);
return false;
} else if (e->n_channels > 2) {
} else if (e->n_channels > 8) {
/* FIXME: In some places code like this is used:
*
* e->masks[alsa_channel_ids[p]][e->n_channels-1]
*
* The definition of e->masks is
*
* pa_channel_position_mask_t masks[SND_MIXER_SCHN_LAST + 1][2];
* pa_channel_position_mask_t masks[SND_MIXER_SCHN_LAST + 1][8];
*
* Since the array size is fixed at 2, we obviously
* Since the array size is fixed at 8, we obviously
* don't support elements with more than two
* channels... */
alsa_id_str(buf, sizeof(buf), &e->alsa_id);
@ -2463,7 +2463,7 @@ static pa_channel_position_mask_t parse_mask(const char *m) {
static int element_parse_override_map(pa_config_parser_state *state) {
pa_alsa_path *p;
pa_alsa_element *e;
const char *split_state = NULL;
const char *split_state = NULL, *s;
unsigned i = 0;
char *n;
@ -2489,12 +2489,18 @@ static int element_parse_override_map(pa_config_parser_state *state) {
}
}
if (pa_streq(state->lvalue, "override-map.1"))
e->masks[i++][0] = m;
else
e->masks[i++][1] = m;
s = strstr(state->lvalue, ".");
if (s) {
int idx;
pa_atoi(s + 1, &idx);
if (idx >= 1 && idx <= 8) {
e->masks[i++][idx-1] = m;
} else {
pa_log("[%s:%u] Override map index '%s' invalid in '%s'", state->filename, state->lineno, state->lvalue, state->section);
}
}
/* Later on we might add override-map.3 and so on here ... */
/* Later on we might add override-map.9 and so on here ... */
pa_xfree(n);
}