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metadata: only emit signal when metadata changed

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This commit is contained in:
Wim Taymans 2020-08-12 18:59:59 +02:00
parent 36c10046da
commit 4b42639541
1 changed files with 47 additions and 18 deletions
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65
src/examples/media-session/metadata.c
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@ -52,15 +52,39 @@ static void clear_item(struct item *item)
spa_zero(*item);
}
static void set_item(struct item *item, uint32_t subject, const char *key, const char *type, const char *value)
{
item->subject = subject;
item->key = strdup(key);
item->type = strdup(type);
item->type = type ? strdup(type) : NULL;
item->value = strdup(value);
}
static inline int strzcmp(const char *s1, const char *s2)
{
if (s1 == s2)
return 0;
if (s1 == NULL || s2 == NULL)
return 1;
return strcmp(s1, s2);
}
static int change_item(struct item *item, const char *type, const char *value)
{
int changed = 0;
if (strzcmp(item->type, type) != 0) {
free((char*)item->type);
item->type = type ? strdup(type) : NULL;
changed++;
}
if (strzcmp(item->value, value) != 0) {
free((char*)item->value);
item->value = value ? strdup(value) : NULL;
changed++;
}
return changed;
}
struct metadata {
struct spa_interface iface;
@ -158,6 +182,7 @@ static int impl_set_property(void *object,
{
struct metadata *this = object;
struct item *item = NULL;
int changed = 0;
pw_log_debug(NAME" %p: id:%d key:%s type:%s value:%s", this, subject, key, type, value);
@ -165,30 +190,34 @@ static int impl_set_property(void *object,
return clear_subjects(this, subject);
item = find_item(this, subject, key);
if (item == NULL) {
if (value == NULL)
return 0;
if (value == NULL) {
if (item != NULL) {
pw_array_remove(&this->metadata, item);
clear_item(item);
type = NULL;
changed++;
pw_log_info(NAME" %p: remove id:%d key:%s", this,
subject, key);
}
} else if (item == NULL) {
item = pw_array_add(&this->metadata, sizeof(*item));
if (item == NULL)
return -errno;
} else {
clear_item(item);
}
if (value != NULL) {
if (type == NULL)
type = "string";
set_item(item, subject, key, type, value);
pw_log_debug(NAME" %p: add id:%d key:%s type:%s value:%s", this,
changed++;
pw_log_info(NAME" %p: add id:%d key:%s type:%s value:%s", this,
subject, key, type, value);
} else {
type = NULL;
pw_array_remove(&this->metadata, item);
pw_log_debug(NAME" %p: remove id:%d key:%s", this, subject, key);
if (type == NULL)
type = item->type;
changed = change_item(item, type, value);
pw_log_info(NAME" %p: change id:%d key:%s type:%s value:%s", this,
subject, key, type, value);
}
pw_metadata_emit_property(&this->hooks,
subject, key, type, value);
if (changed)
pw_metadata_emit_property(&this->hooks,
subject, key, type, value);
return 0;
}