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modem.conf Off-hook improve behavior

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Only restore the old value if it differs from the requested
value, because if it has changed restoring the old value
overrides the change.  Take for example, a voice modem with
a .conf that sets preserve off-hook.  Start playback (on-hook
to off-hook), start record (off-hook to off-hook), stop
playback (off-hook to restore on-hook), stop record (on-hook
to restore off-hook), Clearly you don't want to leave the
modem "on the phone" now that there isn't any playback or
recording active.

Signed-off-by: David Fries <david@fries.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
David Fries 2009-12-25 14:22:38 -06:00 • committed by Takashi Iwai
parent d3c6e2b097
commit 63acb87329
3 changed files with 24 additions and 1 deletions
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12
src/control/setup.c
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@ -192,7 +192,17 @@ int snd_sctl_remove(snd_sctl_t *h)
return err;
}
}
if (elem->preserve) {
/* Only restore the old value if it differs from the requested
* value, because if it has changed restoring the old value
* overrides the change. Take for example, a voice modem with
* a .conf that sets preserve off-hook. Start playback (on-hook
* to off-hook), start record (off-hook to off-hook), stop
* playback (off-hook to restore on-hook), stop record (on-hook
* to restore off-hook), Clearly you don't want to leave the
* modem "on the phone" now that there isn't any playback or
* recording active.
*/
if (elem->preserve && snd_ctl_elem_value_compare(elem->val, elem->old)) {
err = snd_ctl_elem_write(h->ctl, elem->old);
if (err < 0) {
SNDERR("Cannot restore ctl elem");