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alsa: Fix SND_MIXER_SCHN_LAST related stuff.

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Valid channel id range is from 0 to SND_MIXER_SCHN_LAST,
inclusive, so the size of the masks array in pa_alsa_element
has to be SND_MIXER_SCHN_LAST + 1. Similar "too small"
arrays were also in alsa-sink's and alsa-source's userdata,
but actually those arrays were not used at all so they were
removed.

element_is_subset() in alsa-mixer.c skipped the last channel
id when iterating the element masks array; that's now fixed
as well.

Thanks to David Henningsson for spotting the too small
arrays in alsa-sink and alsa-source and the
element_is_subset() problem.
This commit is contained in:
Tanu Kaskinen 2012-03-26 14:35:30 +03:00 • committed by Tanu Kaskinen
parent 191d60688d
commit 5a26404f12
4 changed files with 3 additions and 7 deletions
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4
src/modules/alsa/alsa-mixer.c
View file

@ -1577,7 +1577,7 @@ static int element_probe(pa_alsa_element *e, snd_mixer_t *m) {
*
* The definition of e->masks is
*
* pa_channel_position_mask_t masks[SND_MIXER_SCHN_LAST][2];
* pa_channel_position_mask_t masks[SND_MIXER_SCHN_LAST + 1][2];
*
* Since the array size is fixed at 2, we obviously
* don't support elements with more than two
@ -3105,7 +3105,7 @@ static pa_bool_t element_is_subset(pa_alsa_element *a, pa_alsa_element *b, snd_m
/* If override-maps are different, they're not subsets */
if (a->n_channels != b->n_channels)
return FALSE;
for (s = 0; s < SND_MIXER_SCHN_LAST; s++)
for (s = 0; s <= SND_MIXER_SCHN_LAST; s++)
if (a->masks[s][a->n_channels-1] != b->masks[s][b->n_channels-1]) {
pa_log_debug("Element %s is not a subset - mask a: 0x%" PRIx64 ", mask b: 0x%" PRIx64 ", at channel %d",
a->alsa_name, a->masks[s][a->n_channels-1], b->masks[s][b->n_channels-1], s);