#include "gstbuffer.h"
-static GMutex *default_pool_lock;
+static GMutex *_default_pool_lock;
static GHashTable *_default_pools;
static GstBuffer* gst_buffer_pool_default_create (GstBufferPool *pool, gpointer user_data);
_gst_buffer_pool_initialize (void)
{
_default_pools = g_hash_table_new(NULL,NULL);
- default_pool_lock = g_mutex_new ();
+ _default_pool_lock = g_mutex_new ();
}
/**
pool->new_buffer = NULL;
pool->destroy_buffer = NULL;
-
+ pool->lock = g_mutex_new ();
+#ifdef HAVE_ATOMIC_H
+ atomic_set (&pool->refcount, 1);
+#else
+ pool->refcount = 1;
+#endif
+
return pool;
}
/**
+ * gst_buffer_pool_ref:
+ * @pool: the GstBufferPool to reference
+ *
+ * Increment the refcount of this buffer pool.
+ */
+void
+gst_buffer_pool_ref (GstBufferPool *pool)
+{
+ g_return_if_fail (pool != NULL);
+
+ GST_DEBUG(0,"referencing buffer pool %p from %d\n", pool, GST_BUFFER_POOL_REFCOUNT(pool));
+
+#ifdef HAVE_ATOMIC_H
+ atomic_inc (&(pool->refcount));
+#else
+ g_return_if_fail (pool->refcount > 0);
+ GST_BUFFER_POOL_LOCK (pool);
+ buffer->refcount++;
+ GST_BUFFER_POOL_UNLOCK (pool);
+#endif
+}
+
+/**
+ * gst_buffer_pool_ref_by_count:
+ * @pool: the GstBufferPool to reference
+ * @count: a number
+ *
+ * Increment the refcount of this buffer pool by the given number.
+ */
+void
+gst_buffer_pool_ref_by_count (GstBufferPool *pool, int count)
+{
+ g_return_if_fail (pool != NULL);
+ g_return_if_fail (count > 0);
+
+#ifdef HAVE_ATOMIC_H
+ g_return_if_fail (atomic_read (&(pool->refcount)) > 0);
+ atomic_add (count, &(pool->refcount));
+#else
+ g_return_if_fail (pool->refcount > 0);
+ GST_BUFFER_POOL_LOCK (pool);
+ pool->refcount += count;
+ GST_BUFFER_POOL_UNLOCK (pool);
+#endif
+}
+
+/**
+ * gst_buffer_pool_unref:
+ * @pool: the GstBufferPool to unref
+ *
+ * Decrement the refcount of this buffer pool. If the refcount is
+ * zero and the pool is a default implementation,
+ * the buffer pool will be destroyed.
+ */
+void
+gst_buffer_pool_unref (GstBufferPool *pool)
+{
+ gint zero;
+
+ g_return_if_fail (pool != NULL);
+
+ GST_DEBUG(0,"unreferencing buffer pool %p from %d\n", pool, GST_BUFFER_POOL_REFCOUNT(pool));
+
+#ifdef HAVE_ATOMIC_H
+ g_return_if_fail (atomic_read (&(pool->refcount)) > 0);
+ zero = atomic_dec_and_test (&(pool->refcount));
+#else
+ g_return_if_fail (pool->refcount > 0);
+ GST_BUFFER_POOL_LOCK (pool);
+ pool->refcount--;
+ zero = (pool->refcount == 0);
+ GST_BUFFER_POOL_UNLOCK (pool);
+#endif
+
+ /* if we ended up with the refcount at zero, destroy the buffer pool*/
+ if (zero) {
+ gst_buffer_pool_destroy (pool);
+ }
+}
+
+/**
* gst_buffer_pool_set_create_function:
* @pool: the pool to set the create function for
* @create: the create function
void
gst_buffer_pool_destroy (GstBufferPool *pool)
{
+ GMemChunk *data_chunk;
g_return_if_fail (pool != NULL);
-
+
+ // if its a default buffer pool, we know how to free the user data
+ if (pool->new_buffer == gst_buffer_pool_default_create &&
+ pool->destroy_buffer == gst_buffer_pool_default_destroy){
+ GST_DEBUG(0,"destroying default buffer pool %p\n", pool);
+ data_chunk = (GMemChunk*)pool->new_user_data;
+ g_mem_chunk_reset(data_chunk);
+ g_free(data_chunk);
+ }
+
g_free(pool);
}
pool->destroy_buffer (pool, buffer, pool->new_user_data);
}
+/**
+ * gst_buffer_pool_get_default:
+ * @pool: instance of GstBufferPool which is no longer required (or NULL if it doesn't exist)
+ * @buffer_size: the number of bytes this buffer will store
+ * @pool_size: the default number of buffers to be preallocated
+ *
+ * Returns an instance of a buffer pool using the default
+ * implementation. If a buffer pool instance with the same buffer_size
+ * already exists this will be returned, otherwise a new instance will
+ * be created.
+ *
+ * Returns: an instance of GstBufferPool
+ */
GstBufferPool*
-gst_buffer_pool_get_default (guint buffer_size, guint pool_size)
+gst_buffer_pool_get_default (GstBufferPool *oldpool, guint buffer_size, guint pool_size)
{
GstBufferPool *pool;
GMemChunk *data_chunk;
guint real_buffer_size;
+
+ // round up to the nearest 32 bytes for cache-line and other efficiencies
+ real_buffer_size = (((buffer_size-1) / 32) + 1) * 32;
- // check for an existing GstBufferPool with the same buffer_size
+ // check for an existing GstBufferPool with the same real_buffer_size
// (we won't worry about the pool_size)
- if ((pool = (GstBufferPool*)g_hash_table_lookup(_default_pools,GINT_TO_POINTER(buffer_size)))){
+ g_mutex_lock (_default_pool_lock);
+ pool = (GstBufferPool*)g_hash_table_lookup(_default_pools,GINT_TO_POINTER(real_buffer_size));
+ g_mutex_unlock (_default_pool_lock);
+
+ if (pool != NULL){
+ if (oldpool != pool){
+ gst_buffer_pool_ref(pool);
+
+ if (oldpool != NULL){
+ gst_buffer_pool_unref(oldpool);
+ }
+ }
return pool;
}
- // g_print("new buffer pool bytes:%d size:%d\n", buffer_size, pool_size);
-
- // round up to the nearest 32 bytes for cache-line and other efficiencies
- real_buffer_size = ((buffer_size-1 / 32) + 1) * 32;
data_chunk = g_mem_chunk_new ("GstBufferPoolDefault", real_buffer_size,
real_buffer_size * pool_size, G_ALLOC_AND_FREE);
gst_buffer_pool_set_create_function (pool, gst_buffer_pool_default_create, data_chunk);
gst_buffer_pool_set_destroy_function (pool, gst_buffer_pool_default_destroy, data_chunk);
- g_hash_table_insert(_default_pools,GINT_TO_POINTER(buffer_size),pool);
+ g_mutex_lock (_default_pool_lock);
+ g_hash_table_insert(_default_pools,GINT_TO_POINTER(real_buffer_size),pool);
+ g_mutex_unlock (_default_pool_lock);
+
+ GST_DEBUG(0,"new buffer pool %p bytes:%d size:%d\n", pool, real_buffer_size, pool_size);
+
+ if (oldpool != NULL){
+ gst_buffer_pool_unref(oldpool);
+ }
return pool;
}
GMemChunk *data_chunk = (GMemChunk*)user_data;
GstBuffer *buffer;
+ gst_buffer_pool_ref(pool);
buffer = gst_buffer_new();
GST_BUFFER_FLAG_SET(buffer,GST_BUFFER_DONTFREE);
buffer->pool = pool;
- g_mutex_lock (default_pool_lock);
+ g_mutex_lock (pool->lock);
GST_BUFFER_DATA(buffer) = g_mem_chunk_alloc(data_chunk);
- g_mutex_unlock (default_pool_lock);
+ g_mutex_unlock (pool->lock);
return buffer;
}
GMemChunk *data_chunk = (GMemChunk*)user_data;
gpointer data = GST_BUFFER_DATA(buffer);
- g_mutex_lock (default_pool_lock);
+ g_mutex_lock (pool->lock);
g_mem_chunk_free (data_chunk,data);
- g_mutex_unlock (default_pool_lock);
+ g_mutex_unlock (pool->lock);
buffer->pool = NULL;
+ gst_buffer_pool_unref(pool);
gst_buffer_destroy (buffer);
}
#endif /* __cplusplus */
-#define GST_BUFFER_POOL(buf) \
- ((GstBufferPool *)(buf))
+#define GST_BUFFER_POOL(pool) \
+ ((GstBufferPool *)(pool))
+#define GST_BUFFER_POOL_LOCK(pool) (g_mutex_lock(GST_BUFFER_POOL(pool)->lock))
typedef struct _GstBufferPool GstBufferPool;
typedef void (*GstBufferPoolDestroyFunction) (GstBufferPool *pool, GstBuffer *buffer, gpointer user_data);
struct _GstBufferPool {
+ /* locking */
+ GMutex *lock;
+
+ /* refcounting */
+#ifdef HAVE_ATOMIC_H
+ atomic_t refcount;
+#define GST_BUFFER_POOL_REFCOUNT(pool) (atomic_read(&(GST_BUFFER_POOL((pool))->refcount)))
+#else
+ int refcount;
+#define GST_BUFFER_POOL_REFCOUNT(pool) (GST_BUFFER_POOL(pool)->refcount)
+#endif
+
/* will be called when a new buffer is to be created */
GstBufferPoolCreateFunction new_buffer;
/* user data to pass with the new_buffer function */
gpointer destroy_user_data;
GstBufferPoolDestroyFunction destroy_buffer;
+
};
void _gst_buffer_pool_initialize (void);
GstBuffer* gst_buffer_pool_new_buffer (GstBufferPool *pool);
void gst_buffer_pool_destroy_buffer (GstBufferPool *pool, GstBuffer *buffer);
+/* refcounting */
+void gst_buffer_pool_ref (GstBufferPool *pool);
+void gst_buffer_pool_ref_by_count (GstBufferPool *pool, int count);
+void gst_buffer_pool_unref (GstBufferPool *buffer);
+
/* setting create and destroy functions */
void gst_buffer_pool_set_create_function (GstBufferPool *pool,
GstBufferPoolCreateFunction create,
void gst_buffer_pool_destroy (GstBufferPool *pool);
/* a default buffer pool implementation */
-GstBufferPool* gst_buffer_pool_get_default (guint buffer_size, guint pool_size);
+GstBufferPool* gst_buffer_pool_get_default (GstBufferPool *oldpool, guint buffer_size, guint pool_size);
#ifdef __cplusplus
}
projects / platform / upstream / gstreamer.git / commitdiff