gstreamer/gst/gstbufferpool-default.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstbufferpool-default.c: Private implementation of the default bufferpool
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gstbuffer.h"
#include "gstinfo.h"
#include "gstmemchunk.h"
/* methods prefixed with underscores to avoid namespace collisions with
* gstbuffer.c */
static GstBuffer* _gst_buffer_pool_default_buffer_new (GstBufferPool *pool,
guint64 offset,
guint size,
gpointer user_data);
static void _gst_buffer_pool_default_buffer_free (GstBufferPool *pool,
GstBuffer *buffer,
gpointer user_data);
static void _gst_buffer_pool_default_free (GstData *pool);
typedef struct _GstBufferPoolDefault GstBufferPoolDefault;
struct _GstBufferPoolDefault {
GstMemChunk *mem_chunk;
guint size;
};
static GMutex *_default_pool_lock = NULL;
static GHashTable *_default_pools = NULL;
/**
* _gst_buffer_pool_get_default:
* @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)
{
GstBufferPool *pool;
GstMemChunk *data_chunk;
guint real_buffer_size;
GstBufferPoolDefault *def;
if (!_default_pool_lock) {
_default_pool_lock = g_mutex_new ();
_default_pools = g_hash_table_new (NULL, NULL);
}
/* 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 real_buffer_size */
/* (we won't worry about the pool_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){
gst_buffer_pool_ref (pool);
return pool;
}
data_chunk = gst_mem_chunk_new ("GstBufferPoolDefault", real_buffer_size,
real_buffer_size * pool_size, G_ALLOC_AND_FREE);
def = g_new0 (GstBufferPoolDefault, 1);
def->size = buffer_size;
def->mem_chunk = data_chunk;
pool = gst_buffer_pool_new (_gst_buffer_pool_default_free,
NULL, /* pool copy */
_gst_buffer_pool_default_buffer_new,
NULL, /* buffer copy */
_gst_buffer_pool_default_buffer_free,
def);
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 (GST_CAT_BUFFER,"new default buffer pool %p bytes:%d size:%d",
pool, real_buffer_size, pool_size);
return pool;
}
static GstBuffer*
_gst_buffer_pool_default_buffer_new (GstBufferPool *pool, guint64 offset /*unused*/,
guint size /*unused*/, gpointer user_data)
{
GstBuffer *buffer;
GstBufferPoolDefault *def = (GstBufferPoolDefault*)user_data;
GstMemChunk *data_chunk = def->mem_chunk;
buffer = gst_buffer_new ();
GST_INFO (GST_CAT_BUFFER, "creating new buffer %p from pool %p", buffer, pool);
GST_BUFFER_DATA (buffer) = gst_mem_chunk_alloc (data_chunk);
GST_BUFFER_SIZE (buffer) = def->size;
GST_BUFFER_MAXSIZE (buffer) = def->size;
return buffer;
}
static void
_gst_buffer_pool_default_buffer_free (GstBufferPool *pool, GstBuffer *buffer, gpointer user_data)
{
GstBufferPoolDefault *def = (GstBufferPoolDefault*)user_data;
GstMemChunk *data_chunk = def->mem_chunk;
gpointer data = GST_BUFFER_DATA (buffer);
gst_mem_chunk_free (data_chunk, data);
GST_BUFFER_DATA (buffer) = NULL;
gst_buffer_default_free (buffer);
}
static void
_gst_buffer_pool_default_free (GstData *data)
{
GstBufferPool *pool = (GstBufferPool*) data;
GstBufferPoolDefault *def = (GstBufferPoolDefault*) pool->user_data;
GstMemChunk *data_chunk = def->mem_chunk;
GST_DEBUG (GST_CAT_BUFFER, "destroying default buffer pool %p", pool);
/* this is broken right now, FIXME
gst_mem_chunk_destroy (data_chunk); */
g_free (data_chunk);
g_free (def);
gst_buffer_pool_default_free (pool);
}