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client API: fix missing property change events after property updates 

When update_prop() successfully fetched a changed property value, it
set prop->changed to true to indicate the success.
mark_property_changed() also always set
prop->changed to true and additionally prop->need_new_value to true
This is the case since 6ac0ef78
If the observed property changes every frame and then due to timing
the next mark_property_changed() is called before
gen_property_change_event() and therefore directly after update_prop(),
prop->need_new_value was again true and indicated that a new value
has to be retrieved with update_prop(). As a result the event for the
last successful update_prop() was never triggered. This meant that
a property change event were never generated for frame-based properties
only for properties that were observed with MPV_FORMAT_NONE or when the
timing was different and gen_property_change_event() was called after
update_prop().

To fix this, mark_property_change() and update_prop() should not use the
same flag to indicate different things and therefore a new flag for
successfully update a property is introduced. But with the now decoupled property
changed and updated the need_new_value flag is redundant and removed completely.

Fixes #4195
This commit is contained in:
Gunnar Marten 2019-04-17 00:32:54 +02:00 committed by Jan Ekström
parent c1f1a0845e
commit 31a39334a2
1 changed files with 28 additions and 24 deletions
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22
player/client.c
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@ -90,6 +90,7 @@ struct observe_property {
bool changed; // property change should be signaled to user
bool need_new_value; // a new value should be retrieved
bool updating; // a new value is being retrieved
bool updated; // a new value was successfully retrieved
bool dead; // property unobserved while retrieving value
bool new_value_valid, user_value_valid;
union m_option_value new_value, user_value;
@ -1467,7 +1468,8 @@ int mpv_observe_property(mpv_handle *ctx, uint64_t userdata,
.reply_id = userdata,
.format = format,
.changed = true,
.need_new_value = true,
.updating = false,
.updated = false,
};
MP_TARRAY_APPEND(ctx, ctx->properties, ctx->num_properties, prop);
ctx->property_event_masks |= prop->event_mask;
@ -1510,7 +1512,6 @@ static void mark_property_changed(struct mpv_handle *client, int index)
{
struct observe_property *prop = client->properties[index];
prop->changed = true;
prop->need_new_value = prop->format != 0;
client->lowest_changed = MPMIN(client->lowest_changed, index);
}
@ -1574,10 +1575,10 @@ static void update_prop(void *p)
if (prop->new_value_valid)
memcpy(&prop->new_value, &val, type->type->size);
if (prop->user_value_valid != prop->new_value_valid) {
prop->changed = true;
prop->updated = true;
} else if (prop->user_value_valid && prop->new_value_valid) {
if (!equal_mpv_value(&prop->user_value, &prop->new_value, prop->format))
prop->changed = true;
prop->updated = true;
}
if (prop->dead)
talloc_steal(ctx->cur_event, prop);
@ -1595,17 +1596,21 @@ static bool gen_property_change_event(struct mpv_handle *ctx)
ctx->lowest_changed = ctx->num_properties;
for (int n = start; n < ctx->num_properties; n++) {
struct observe_property *prop = ctx->properties[n];
if ((prop->changed || prop->updating) && n < ctx->lowest_changed)
if ((prop->changed || prop->updating || prop->updated) && n < ctx->lowest_changed)
ctx->lowest_changed = n;
if (prop->changed) {
bool get_value = prop->need_new_value;
prop->need_new_value = false;
prop->changed = false;
if (prop->format && get_value) {
if (prop->format != MPV_FORMAT_NONE) {
ctx->properties_updating++;
prop->updating = true;
mp_dispatch_enqueue(ctx->mpctx->dispatch, update_prop, prop);
} else {
prop->updated = true;
}
}
bool updated = prop->updated;
prop->updated = false;
if (updated) {
const struct m_option *type = get_mp_type_get(prop->format);
prop->user_value_valid = prop->new_value_valid;
if (prop->new_value_valid)
@ -1624,7 +1629,6 @@ static bool gen_property_change_event(struct mpv_handle *ctx)
return true;
}
}
}
return false;
}