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make scene items use linked list rather than array (containers are a bad habit), add a few functions for getting scene item information, also use a mutex to prevent race conditions when using the linked list

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This commit is contained in:
jp9000 2014-01-01 10:22:55 -07:00
parent 96448d7361
commit 966c091078
4 changed files with 159 additions and 39 deletions
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1
.gitignore vendored
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@ -41,6 +41,7 @@ ltmain.sh
.depend
tags
*.trace
*.swp
*.dat
*.clbin

164
libobs/obs-scene.c
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@ -27,8 +27,14 @@ static const char *scene_getname(const char *locale)
static void *scene_create(const char *settings, struct obs_source *source)
{
struct obs_scene *scene = bmalloc(sizeof(struct obs_scene));
scene->source = source;
da_init(scene->items);
scene->source = source;
scene->first_item = NULL;
if (pthread_mutex_init(&scene->mutex, NULL) != 0) {
blog(LOG_ERROR, "scene_create: Couldn't initialize mutex");
bfree(scene);
return NULL;
}
return scene;
}
@ -36,16 +42,18 @@ static void *scene_create(const char *settings, struct obs_source *source)
static void scene_destroy(void *data)
{
struct obs_scene *scene = data;
size_t i;
struct obs_scene_item *item = scene->first_item;
for (i = 0; i < scene->items.num; i++) {
struct obs_scene_item *item = scene->items.array[i];
if (item->source)
obs_source_release(item->source);
bfree(item);
while (item) {
struct obs_scene_item *del_item = item;
item = item->next;
if (del_item->source)
obs_source_release(del_item->source);
bfree(del_item);
}
da_free(scene->items);
pthread_mutex_destroy(&scene->mutex);
bfree(scene);
}
@ -54,17 +62,46 @@ static uint32_t scene_get_output_flags(void *data)
return SOURCE_VIDEO;
}
static inline void detach_sceneitem(struct obs_scene_item *item)
{
if (item->prev)
item->prev->next = item->next;
else
item->parent->first_item = item->next;
if (item->next)
item->next->prev = item->prev;
}
static inline void attach_sceneitem(struct obs_scene_item *item,
struct obs_scene_item *prev)
{
item->prev = prev;
if (prev) {
item->next = prev->next;
if (prev->next)
prev->next->prev = item;
prev->next = item;
} else {
item->next = item->parent->first_item;
item->parent->first_item = item;
}
}
static void scene_video_render(void *data)
{
struct obs_scene *scene = data;
size_t i;
struct obs_scene_item *item = scene->first_item;
for (i = scene->items.num; i > 0; i--) {
struct obs_scene_item *item = scene->items.array[i-1];
pthread_mutex_lock(&scene->mutex);
while (item) {
if (obs_source_removed(item->source)) {
obs_source_release(item->source);
da_erase(scene->items, i--);
struct obs_scene_item *del_item = item;
item = item->next;
obs_sceneitem_destroy(del_item);
continue;
}
@ -77,7 +114,11 @@ static void scene_video_render(void *data)
obs_source_video_render(item->source);
gs_matrix_pop();
item = item->next;
}
pthread_mutex_unlock(&scene->mutex);
}
static uint32_t scene_getsize(void *data)
@ -105,6 +146,8 @@ obs_scene_t obs_scene_create(const char *name)
memset(source, 0, sizeof(struct obs_source));
source->data = scene;
assert(source->data);
if (!source->data) {
bfree(source);
return NULL;
@ -144,9 +187,50 @@ obs_scene_t obs_scene_fromsource(obs_source_t source)
return source->data;
}
obs_sceneitem_t obs_scene_findsource(obs_scene_t scene, const char *name)
{
struct obs_scene_item *item;
pthread_mutex_lock(&scene->mutex);
item = scene->first_item;
while (item) {
if (strcmp(item->source->name, name) == 0) {
break;
}
item = item->next;
}
pthread_mutex_unlock(&scene->mutex);
return item;
}
void obs_scene_enum_items(obs_scene_t scene,
bool (*callback)(obs_scene_t, obs_sceneitem_t, void*),
void *param)
{
struct obs_scene_item *item;
pthread_mutex_lock(&scene->mutex);
item = scene->first_item;
while (item) {
if (!callback(scene, item, param))
break;
item = item->next;
}
pthread_mutex_unlock(&scene->mutex);
}
obs_sceneitem_t obs_scene_add(obs_scene_t scene, obs_source_t source)
{
struct obs_scene_item *last;
struct obs_scene_item *item = bmalloc(sizeof(struct obs_scene_item));
memset(item, 0, sizeof(struct obs_scene_item));
item->source = source;
item->visible = true;
@ -156,18 +240,32 @@ obs_sceneitem_t obs_scene_add(obs_scene_t scene, obs_source_t source)
if (source)
obs_source_addref(source);
da_push_back(scene->items, &item);
pthread_mutex_lock(&scene->mutex);
last = scene->first_item;
if (!last) {
scene->first_item = item;
} else {
while (last->next)
last = last->next;
last->next = item;
item->prev = last;
}
pthread_mutex_unlock(&scene->mutex);
return item;
}
int obs_sceneitem_destroy(obs_sceneitem_t item)
{
int ref = 0;
if (item) {
detach_sceneitem(item);
if (item->source)
ref = obs_source_release(item->source);
da_erase_item(item->parent->items, item);
bfree(item);
}
@ -203,26 +301,32 @@ void obs_sceneitem_setorder(obs_sceneitem_t item, enum order_movement movement)
{
struct obs_scene *scene = item->parent;
pthread_mutex_lock(&scene->mutex);
detach_sceneitem(item);
if (movement == ORDER_MOVE_UP) {
size_t idx = da_find(scene->items, &item, 0);
if (idx > 0)
da_move_item(scene->items, idx, idx-1);
attach_sceneitem(item, item->prev);
} else if (movement == ORDER_MOVE_DOWN) {
size_t idx = da_find(scene->items, &item, 0);
if (idx < (scene->items.num-1))
da_move_item(scene->items, idx, idx+1);
attach_sceneitem(item, item->next);
} else if (movement == ORDER_MOVE_TOP) {
size_t idx = da_find(scene->items, &item, 0);
if (idx > 0)
da_move_item(scene->items, idx, 0);
struct obs_scene_item *last = item->next;
if (!last) {
last = item->prev;
} else {
while (last->next)
last = last->next;
}
} else if (movement == ORDER_MOVE_TOP) {
size_t idx = da_find(scene->items, &item, 0);
if (idx < (scene->items.num-1))
da_move_item(scene->items, idx, scene->items.num-1);
attach_sceneitem(item, last);
} else if (movement == ORDER_MOVE_BOTTOM) {
attach_sceneitem(item, NULL);
}
pthread_mutex_unlock(&scene->mutex);
}
void obs_sceneitem_getpos(obs_sceneitem_t item, struct vec2 *pos)

24
libobs/obs-scene.h
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@ -23,17 +23,23 @@
/* how obs scene! */
struct obs_scene_item {
obs_scene_t parent;
obs_source_t source;
bool visible;
struct obs_scene *parent;
struct obs_source *source;
bool visible;
struct vec2 origin;
struct vec2 pos;
struct vec2 scale;
float rot;
struct vec2 origin;
struct vec2 pos;
struct vec2 scale;
float rot;
/* would do **prev_next, but not really great for resorting */
struct obs_scene_item *prev;
struct obs_scene_item *next;
};
struct obs_scene {
obs_source_t source;
DARRAY(struct obs_scene_item*) items;
struct obs_source *source;
pthread_mutex_t mutex;
struct obs_scene_item *first_item;
};

9
libobs/obs.h
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@ -456,6 +456,15 @@ EXPORT obs_source_t obs_scene_getsource(obs_scene_t scene);
/** Gets the scene from its source, or NULL if not a scene */
EXPORT obs_scene_t obs_scene_fromsource(obs_source_t source);
/** Determines whether a source is within a scene */
EXPORT obs_sceneitem_t obs_scene_findsource(obs_scene_t scene,
const char *name);
/** Enumerates sources within a scene */
EXPORT void obs_scene_enum_items(obs_scene_t scene,
bool (*callback)(obs_scene_t, obs_sceneitem_t, void*),
void *param);
/** Adds/creates a new scene item for a source */
EXPORT obs_sceneitem_t obs_scene_add(obs_scene_t scene, obs_source_t source);