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player/client: support observing sub-properties 

This notifies if either a descendent or ancestor of the requested path is modified.
This commit is contained in:
rcombs 2022-12-16 13:40:21 -06:00
parent 0b3c37bc43
commit dc4fd24c6f
1 changed files with 26 additions and 1 deletions
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27
player/client.c
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@ -1586,6 +1586,30 @@ int mpv_unobserve_property(mpv_handle *ctx, uint64_t userdata)
return count;
}
static bool property_shared_prefix(const char *a0, const char *b0)
{
bstr a = bstr0(a0);
bstr b = bstr0(b0);
// Treat options and properties as equivalent.
bstr_eatstart0(&a, "options/");
bstr_eatstart0(&b, "options/");
// Compare the potentially-common portion
if (memcmp(a.start, b.start, MPMIN(a.len, b.len)))
return false;
// If lengths were equal, we're done
if (a.len == b.len)
return true;
// Check for a slash in the first non-common byte of the longer string
if (a.len > b.len)
return a.start[b.len] == '/';
else
return b.start[a.len] == '/';
}
// Broadcast that a property has changed.
void mp_client_property_change(struct MPContext *mpctx, const char *name)
{
@ -1599,7 +1623,8 @@ void mp_client_property_change(struct MPContext *mpctx, const char *name)
struct mpv_handle *client = clients->clients[n];
pthread_mutex_lock(&client->lock);
for (int i = 0; i < client->num_properties; i++) {
if (client->properties[i]->id == id) {
if (client->properties[i]->id == id &&
property_shared_prefix(name, client->properties[i]->name)) {
client->properties[i]->change_ts += 1;
client->has_pending_properties = true;
any_pending = true;