gstreamer/gst-libs/gst/vaapi/gstvaapivideopool.c

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/*
* gstvaapivideopool.c - Video object pool abstraction
*
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* gstreamer-vaapi (C) 2010-2011 Splitted-Desktop Systems
*
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* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
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* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
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* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
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* SECTION:gstvaapivideopool
* @short_description: Video object pool abstraction
*/
#include "config.h"
#include "gstvaapivideopool.h"
#define DEBUG 1
#include "gstvaapidebug.h"
G_DEFINE_TYPE(GstVaapiVideoPool, gst_vaapi_video_pool, G_TYPE_OBJECT);
#define GST_VAAPI_VIDEO_POOL_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE((obj), \
GST_VAAPI_TYPE_VIDEO_POOL, \
GstVaapiVideoPoolPrivate))
struct _GstVaapiVideoPoolPrivate {
GstVaapiDisplay *display;
GQueue free_objects;
GList *used_objects;
GstCaps *caps;
guint used_count;
guint capacity;
};
enum {
PROP_0,
PROP_DISPLAY,
PROP_CAPS,
PROP_CAPACITY
};
static void
gst_vaapi_video_pool_set_caps(GstVaapiVideoPool *pool, GstCaps *caps);
static inline gpointer
gst_vaapi_video_pool_alloc_object(GstVaapiVideoPool *pool)
{
GstVaapiVideoPoolClass * const klass = GST_VAAPI_VIDEO_POOL_GET_CLASS(pool);
return klass->alloc_object(pool, pool->priv->display);
}
static void
gst_vaapi_video_pool_clear(GstVaapiVideoPool *pool)
{
GstVaapiVideoPoolPrivate * const priv = pool->priv;
gpointer object;
GList *list, *next;
for (list = priv->used_objects; list; list = next) {
next = list->next;
g_object_unref(list->data);
g_list_free_1(list);
}
priv->used_objects = NULL;
while ((object = g_queue_pop_head(&priv->free_objects)))
g_object_unref(object);
}
static void
gst_vaapi_video_pool_destroy(GstVaapiVideoPool *pool)
{
GstVaapiVideoPoolPrivate * const priv = pool->priv;
gst_vaapi_video_pool_clear(pool);
if (priv->caps) {
gst_caps_unref(priv->caps);
priv->caps = NULL;
}
if (priv->display) {
g_object_unref(priv->display);
priv->display = NULL;
}
}
static void
gst_vaapi_video_pool_finalize(GObject *object)
{
gst_vaapi_video_pool_destroy(GST_VAAPI_VIDEO_POOL(object));
G_OBJECT_CLASS(gst_vaapi_video_pool_parent_class)->finalize(object);
}
static void
gst_vaapi_video_pool_set_property(
GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec
)
{
GstVaapiVideoPool * const pool = GST_VAAPI_VIDEO_POOL(object);
switch (prop_id) {
case PROP_DISPLAY:
pool->priv->display = g_object_ref(g_value_get_object(value));
break;
case PROP_CAPS:
gst_vaapi_video_pool_set_caps(pool, g_value_get_pointer(value));
break;
case PROP_CAPACITY:
gst_vaapi_video_pool_set_capacity(pool, g_value_get_uint(value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
break;
}
}
static void
gst_vaapi_video_pool_get_property(
GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec
)
{
GstVaapiVideoPool * const pool = GST_VAAPI_VIDEO_POOL(object);
switch (prop_id) {
case PROP_DISPLAY:
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g_value_set_object(value, gst_vaapi_video_pool_get_display(pool));
break;
case PROP_CAPS:
g_value_set_pointer(value, gst_vaapi_video_pool_get_caps(pool));
break;
case PROP_CAPACITY:
g_value_set_uint(value, gst_vaapi_video_pool_get_capacity(pool));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
break;
}
}
static void
gst_vaapi_video_pool_class_init(GstVaapiVideoPoolClass *klass)
{
GObjectClass * const object_class = G_OBJECT_CLASS(klass);
g_type_class_add_private(klass, sizeof(GstVaapiVideoPoolPrivate));
object_class->finalize = gst_vaapi_video_pool_finalize;
object_class->set_property = gst_vaapi_video_pool_set_property;
object_class->get_property = gst_vaapi_video_pool_get_property;
/**
* GstVaapiVideoPool:display:
*
* The #GstVaapiDisplay this pool is bound to.
*/
g_object_class_install_property
(object_class,
PROP_DISPLAY,
g_param_spec_object("display",
"Display",
"The GstVaapiDisplay this pool is bound to",
GST_VAAPI_TYPE_DISPLAY,
G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY));
/**
* GstVaapiVidePool:caps:
*
* The video object capabilities represented as a #GstCaps. This
* shall hold at least the "width" and "height" properties.
*/
g_object_class_install_property
(object_class,
PROP_CAPS,
g_param_spec_pointer("caps",
"caps",
"The video object capabilities",
G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY));
/**
* GstVaapiVidePool:capacity:
*
* The maximum number of objects in the pool. Or zero, the pool
* will allocate as many objects as possible.
*/
g_object_class_install_property
(object_class,
PROP_CAPACITY,
g_param_spec_uint("capacity",
"capacity",
"The maximum number of objects in the pool",
0, G_MAXUINT32, 0,
G_PARAM_READWRITE));
}
static void
gst_vaapi_video_pool_init(GstVaapiVideoPool *pool)
{
GstVaapiVideoPoolPrivate *priv = GST_VAAPI_VIDEO_POOL_GET_PRIVATE(pool);
pool->priv = priv;
priv->display = NULL;
priv->used_objects = NULL;
priv->caps = NULL;
priv->used_count = 0;
priv->capacity = 0;
g_queue_init(&priv->free_objects);
}
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/**
* gst_vaapi_video_pool_get_display:
* @pool: a #GstVaapiVideoPool
*
* Retrieves the #GstVaapiDisplay the @pool is bound to. The @pool
* owns the returned object and it shall not be unref'ed.
*
* Return value: the #GstVaapiDisplay the @pool is bound to
*/
GstVaapiDisplay *
gst_vaapi_video_pool_get_display(GstVaapiVideoPool *pool)
{
g_return_val_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool), NULL);
return pool->priv->display;
}
/**
* gst_vaapi_video_pool_get_caps:
* @pool: a #GstVaapiVideoPool
*
* Retrieves the #GstCaps the @pool was created with. The @pool owns
* the returned object and it shall not be unref'ed.
*
* Return value: the #GstCaps the @pool was created with
*/
GstCaps *
gst_vaapi_video_pool_get_caps(GstVaapiVideoPool *pool)
{
g_return_val_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool), NULL);
return pool->priv->caps;
}
/*
* gst_vaapi_video_pool_set_caps:
* @pool: a #GstVaapiVideoPool
* @caps: a #GstCaps
*
* Binds new @caps to the @pool and notify the sub-classes.
*/
void
gst_vaapi_video_pool_set_caps(GstVaapiVideoPool *pool, GstCaps *caps)
{
GstVaapiVideoPoolClass * const klass = GST_VAAPI_VIDEO_POOL_GET_CLASS(pool);
pool->priv->caps = gst_caps_ref(caps);
if (klass->set_caps)
klass->set_caps(pool, caps);
}
/**
* gst_vaapi_video_pool_get_object:
* @pool: a #GstVaapiVideoPool
*
* Retrieves a new object from the @pool, or allocates a new one if
* none was found. The @pool holds a reference on the returned object
* and thus shall be released through gst_vaapi_video_pool_put_object()
* when it's no longer needed.
*
* Return value: a possibly newly allocated object, or %NULL on error
*/
gpointer
gst_vaapi_video_pool_get_object(GstVaapiVideoPool *pool)
{
GstVaapiVideoPoolPrivate *priv;
gpointer object;
g_return_val_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool), NULL);
priv = pool->priv;
if (priv->capacity && priv->used_count >= priv->capacity)
return NULL;
object = g_queue_pop_head(&priv->free_objects);
if (!object) {
object = gst_vaapi_video_pool_alloc_object(pool);
if (!object)
return NULL;
}
++priv->used_count;
priv->used_objects = g_list_prepend(priv->used_objects, object);
return g_object_ref(object);
}
/**
* gst_vaapi_video_pool_put_object:
* @pool: a #GstVaapiVideoPool
* @object: the object to add back to the pool
*
* Pushes the @object back into the pool. The @object shall be
* obtained from the @pool through gst_vaapi_video_pool_get_object().
* Calling this function with an arbitrary object yields undefined
* behaviour.
*/
void
gst_vaapi_video_pool_put_object(GstVaapiVideoPool *pool, gpointer object)
{
GstVaapiVideoPoolPrivate *priv;
GList *elem;
g_return_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool));
g_return_if_fail(G_IS_OBJECT(object));
priv = pool->priv;
elem = g_list_find(priv->used_objects, object);
if (!elem)
return;
g_object_unref(object);
--priv->used_count;
priv->used_objects = g_list_delete_link(priv->used_objects, elem);
g_queue_push_tail(&priv->free_objects, object);
}
/**
* gst_vaapi_video_pool_add_object:
* @pool: a #GstVaapiVideoPool
* @object: the object to add to the pool
*
* Adds the @object to the pool. The pool then holds a reference on
* the @object. This operation does not change the capacity of the
* pool.
*
* Return value: %TRUE on success.
*/
gboolean
gst_vaapi_video_pool_add_object(GstVaapiVideoPool *pool, gpointer object)
{
g_return_val_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool), FALSE);
g_return_val_if_fail(G_IS_OBJECT(object), FALSE);
g_queue_push_tail(&pool->priv->free_objects, g_object_ref(object));
return TRUE;
}
/**
* gst_vaapi_video_pool_add_objects:
* @pool: a #GstVaapiVideoPool
* @objects: a #GPtrArray of objects
*
* Adds the @objects to the pool. The pool then holds a reference on
* the @objects. This operation does not change the capacity of the
* pool and is just a wrapper around gst_vaapi_video_pool_add_object().
*
* Return value: %TRUE on success.
*/
gboolean
gst_vaapi_video_pool_add_objects(GstVaapiVideoPool *pool, GPtrArray *objects)
{
guint i;
g_return_val_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool), FALSE);
for (i = 0; i < objects->len; i++) {
gpointer const object = g_ptr_array_index(objects, i);
if (!gst_vaapi_video_pool_add_object(pool, object))
return FALSE;
}
return TRUE;
}
/**
* gst_vaapi_video_pool_get_size:
* @pool: a #GstVaapiVideoPool
*
* Returns the number of free objects available in the pool.
*
* Return value: number of free objects in the pool
*/
guint
gst_vaapi_video_pool_get_size(GstVaapiVideoPool *pool)
{
g_return_val_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool), 0);
return g_queue_get_length(&pool->priv->free_objects);
}
/**
* gst_vaapi_video_pool_reserve:
* @pool: a #GstVaapiVideoPool
* @n: the number of objects to pre-allocate
*
* Pre-allocates up to @n objects in the pool. If @n is less than or
* equal to the number of free and used objects in the pool, this call
* has no effect. Otherwise, it is a request for allocation of
* additional objects.
*
* Return value: %TRUE on success
*/
gboolean
gst_vaapi_video_pool_reserve(GstVaapiVideoPool *pool, guint n)
{
guint i, num_allocated;
g_return_val_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool), 0);
num_allocated = gst_vaapi_video_pool_get_size(pool) + pool->priv->used_count;
if (n < num_allocated)
return TRUE;
if ((n -= num_allocated) > pool->priv->capacity)
n = pool->priv->capacity;
for (i = num_allocated; i < n; i++) {
gpointer const object = gst_vaapi_video_pool_alloc_object(pool);
if (!object)
return FALSE;
g_queue_push_tail(&pool->priv->free_objects, object);
}
return TRUE;
}
/**
* gst_vaapi_video_pool_get_capacity:
* @pool: a #GstVaapiVideoPool
*
* Returns the maximum number of objects in the pool. i.e. the maximum
* number of objects that can be returned by gst_vaapi_video_pool_get_object().
*
* Return value: the capacity of the pool
*/
guint
gst_vaapi_video_pool_get_capacity(GstVaapiVideoPool *pool)
{
g_return_val_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool), 0);
return pool->priv->capacity;
}
/**
* gst_vaapi_video_pool_set_capacity:
* @pool: a #GstVaapiVideoPool
* @capacity: the maximal capacity of the pool
*
* Sets the maximum number of objects that can be allocated in the pool.
*/
void
gst_vaapi_video_pool_set_capacity(GstVaapiVideoPool *pool, guint capacity)
{
g_return_if_fail(GST_VAAPI_IS_VIDEO_POOL(pool));
pool->priv->capacity = capacity;
}