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spa: save the old change_mask and restore when emitting full

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When we add a new listener to an object, it will emit the full state
of the object. For this it temporarily sets the change_mask to all
changes. Restore the previous state after this or else we might not
emit the right change_mask for the next listener.

Consider the case where one there are two listeners on an object.
The object emits a change and the first listener wants to enumerate the
changed params. For this is adds a new listener and then triggers the
enumeration. If we set the change_mask to 0 after adding the listener,
the second listener would get a 0 change_mask and fail to update
its state.
This commit is contained in:
Wim Taymans 2021-05-25 15:22:13 +02:00
parent c8c0a152b7
commit 46ef88e520
42 changed files with 151 additions and 77 deletions
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3
spa/plugins/alsa/alsa-acp-device.c
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@ -219,6 +219,7 @@ static int emit_info(struct impl *this, bool full)
const struct acp_dict_item *it;
struct acp_card *card = this->card;
char path[128];
uint64_t old = full ? this->info.change_mask : 0;
if (full)
this->info.change_mask = this->info_all;
@ -247,7 +248,7 @@ static int emit_info(struct impl *this, bool full)
}
}
spa_device_emit_info(&this->hooks, &this->info);
this->info.change_mask = 0;
this->info.change_mask = old;
}
return err;
}