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memory: Make GstAllocator a GstObject

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Make GstAllocator a GstObject instead of a GstMiniObject, like bufferpool.
Make a new gstallocator.c file. Make a GstAllocator subclass for the default
allocator.
This commit is contained in:
Wim Taymans 2012-07-09 16:02:50 +02:00
parent 6e7c469b48
commit f362f643ac
15 changed files with 921 additions and 799 deletions
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2
gst/Makefile.am
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@ -48,6 +48,7 @@ EXTRA_libgstreamer_@GST_API_VERSION@_la_SOURCES = \
libgstreamer_@GST_API_VERSION@_la_SOURCES = \
gst.c \
gstobject.c \
gstallocator.c \
gstbin.c \
gstbuffer.c \
gstbufferlist.c \
@ -142,6 +143,7 @@ gst_headers = \
gst.h \
glib-compat.h \
gstobject.h \
gstallocator.h \
gstbin.h \
gstbuffer.h \
gstbufferlist.h \

618
gst/gstallocator.c Normal file
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@ -0,0 +1,618 @@
/* GStreamer
* Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.be>
*
* gstallocator.c: memory block allocator
*
* 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.
*/
/**
* SECTION:gstallocator
* @short_description: allocate memory blocks
* @see_also: #GstMemory
*
* Memory is usually created by allocators with a gst_allocator_alloc()
* method call. When NULL is used as the allocator, the default allocator will
* be used.
*
* New allocators can be registered with gst_allocator_register().
* Allocators are identified by name and can be retrieved with
* gst_allocator_find(). gst_allocator_set_default() can be used to change the
* default allocator.
*
* New memory can be created with gst_memory_new_wrapped() that wraps the memory
* allocated elsewhere.
*
* Last reviewed on 2012-07-09 (0.11.3)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gst_private.h"
#include "gstmemory.h"
GST_DEBUG_CATEGORY_STATIC (gst_allocator_debug);
#define GST_CAT_DEFAULT gst_allocator_debug
#define GST_ALLOCATOR_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_ALLOCATOR, GstAllocatorPrivate))
struct _GstAllocatorPrivate
{
gpointer dummy;
};
#if defined(MEMORY_ALIGNMENT_MALLOC)
size_t gst_memory_alignment = 7;
#elif defined(MEMORY_ALIGNMENT_PAGESIZE)
/* we fill this in in the _init method */
size_t gst_memory_alignment = 0;
#elif defined(MEMORY_ALIGNMENT)
size_t gst_memory_alignment = MEMORY_ALIGNMENT - 1;
#else
#error "No memory alignment configured"
size_t gst_memory_alignment = 0;
#endif
/* the default allocator */
static GstAllocator *_default_allocator;
static GstAllocator *_sysmem_allocator;
/* registered allocators */
static GRWLock lock;
static GHashTable *allocators;
G_DEFINE_ABSTRACT_TYPE (GstAllocator, gst_allocator, GST_TYPE_OBJECT);
static void
gst_allocator_class_init (GstAllocatorClass * klass)
{
g_type_class_add_private (klass, sizeof (GstAllocatorPrivate));
GST_DEBUG_CATEGORY_INIT (gst_allocator_debug, "allocator", 0,
"allocator debug");
}
static GstMemory *
_fallback_mem_copy (GstMemory * mem, gssize offset, gssize size)
{
GstMemory *copy;
GstMapInfo sinfo, dinfo;
GstAllocationParams params = { 0, 0, 0, mem->align, };
if (!gst_memory_map (mem, &sinfo, GST_MAP_READ))
return NULL;
if (size == -1)
size = sinfo.size > offset ? sinfo.size - offset : 0;
/* use the same allocator as the memory we copy */
copy = gst_allocator_alloc (mem->allocator, size, &params);
if (!gst_memory_map (copy, &dinfo, GST_MAP_WRITE)) {
GST_CAT_WARNING (GST_CAT_MEMORY, "could not write map memory %p", copy);
gst_memory_unmap (mem, &sinfo);
return NULL;
}
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
"memcpy %" G_GSSIZE_FORMAT " memory %p -> %p", size, mem, copy);
memcpy (dinfo.data, sinfo.data + offset, size);
gst_memory_unmap (copy, &dinfo);
gst_memory_unmap (mem, &sinfo);
return copy;
}
static gboolean
_fallback_mem_is_span (GstMemory * mem1, GstMemory * mem2, gsize * offset)
{
return FALSE;
}
static void
gst_allocator_init (GstAllocator * allocator)
{
allocator->priv = GST_ALLOCATOR_GET_PRIVATE (allocator);
allocator->mem_copy = _fallback_mem_copy;
allocator->mem_is_span = _fallback_mem_is_span;
}
G_DEFINE_BOXED_TYPE (GstAllocationParams, gst_allocation_params,
(GBoxedCopyFunc) gst_allocation_params_copy,
(GBoxedFreeFunc) gst_allocation_params_free);
/**
* gst_allocation_params_init:
* @params: a #GstAllocationParams
*
* Initialize @params to its default values
*/
void
gst_allocation_params_init (GstAllocationParams * params)
{
g_return_if_fail (params != NULL);
memset (params, 0, sizeof (GstAllocationParams));
}
/**
* gst_allocation_params_copy:
* @params: (transfer none): a #GstAllocationParams
*
* Create a copy of @params.
*
* Free-function: gst_allocation_params_free
*
* Returns: (transfer full): a new ##GstAllocationParams, free with
* gst_allocation_params_free().
*/
GstAllocationParams *
gst_allocation_params_copy (const GstAllocationParams * params)
{
GstAllocationParams *result = NULL;
if (params) {
result =
(GstAllocationParams *) g_slice_copy (sizeof (GstAllocationParams),
params);
}
return result;
}
/**
* gst_allocation_params_free:
* @params: (in) (transfer full): a #GstAllocationParams
*
* Free @params
*/
void
gst_allocation_params_free (GstAllocationParams * params)
{
g_slice_free (GstAllocationParams, params);
}
/**
* gst_allocator_register:
* @name: the name of the allocator
* @allocator: (transfer full): #GstAllocator
*
* Registers the memory @allocator with @name. This function takes ownership of
* @allocator.
*/
void
gst_allocator_register (const gchar * name, GstAllocator * allocator)
{
g_return_if_fail (name != NULL);
g_return_if_fail (allocator != NULL);
GST_CAT_DEBUG (GST_CAT_MEMORY, "registering allocator %p with name \"%s\"",
allocator, name);
g_rw_lock_writer_lock (&lock);
g_hash_table_insert (allocators, (gpointer) name, (gpointer) allocator);
g_rw_lock_writer_unlock (&lock);
}
/**
* gst_allocator_find:
* @name: the name of the allocator
*
* Find a previously registered allocator with @name. When @name is NULL, the
* default allocator will be returned.
*
* Returns: (transfer full): a #GstAllocator or NULL when the allocator with @name was not
* registered. Use gst_object_unref() to release the allocator after usage.
*/
GstAllocator *
gst_allocator_find (const gchar * name)
{
GstAllocator *allocator;
g_rw_lock_reader_lock (&lock);
if (name) {
allocator = g_hash_table_lookup (allocators, (gconstpointer) name);
} else {
allocator = _default_allocator;
}
if (allocator)
gst_object_ref (allocator);
g_rw_lock_reader_unlock (&lock);
return allocator;
}
/**
* gst_allocator_set_default:
* @allocator: (transfer full): a #GstAllocator
*
* Set the default allocator. This function takes ownership of @allocator.
*/
void
gst_allocator_set_default (GstAllocator * allocator)
{
GstAllocator *old;
g_return_if_fail (GST_IS_ALLOCATOR (allocator));
g_rw_lock_writer_lock (&lock);
old = _default_allocator;
_default_allocator = allocator;
g_rw_lock_writer_unlock (&lock);
if (old)
gst_object_unref (old);
}
/**
* gst_allocator_alloc:
* @allocator: (transfer none) (allow-none): a #GstAllocator to use
* @size: size of the visible memory area
* @params: (transfer none) (allow-none): optional parameters
*
* Use @allocator to allocate a new memory block with memory that is at least
* @size big.
*
* The optional @params can specify the prefix and padding for the memory. If
* NULL is passed, no flags, no extra prefix/padding and a default alignment is
* used.
*
* The prefix/padding will be filled with 0 if flags contains
* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED respectively.
*
* When @allocator is NULL, the default allocator will be used.
*
* The alignment in @params is given as a bitmask so that @align + 1 equals
* the amount of bytes to align to. For example, to align to 8 bytes,
* use an alignment of 7.
*
* Returns: (transfer full): a new #GstMemory.
*/
GstMemory *
gst_allocator_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params)
{
GstMemory *mem;
static GstAllocationParams defparams = { 0, 0, 0, 0, };
GstAllocatorClass *aclass;
if (params) {
g_return_val_if_fail (((params->align + 1) & params->align) == 0, NULL);
} else {
params = &defparams;
}
if (allocator == NULL)
allocator = _default_allocator;
aclass = GST_ALLOCATOR_GET_CLASS (allocator);
if (aclass->alloc)
mem = aclass->alloc (allocator, size, params, NULL);
else
mem = NULL;
return mem;
}
/**
* gst_allocator_free:
* @allocator: (transfer none): a #GstAllocator to use
* @memory: (transfer full): the memory to free
*
* Free @memory that was previously allocated with gst_allocator_alloc().
*/
void
gst_allocator_free (GstAllocator * allocator, GstMemory * memory)
{
GstAllocatorClass *aclass;
g_return_if_fail (GST_IS_ALLOCATOR (allocator));
g_return_if_fail (memory != NULL);
g_return_if_fail (memory->allocator == allocator);
aclass = GST_ALLOCATOR_GET_CLASS (allocator);
if (aclass->free)
aclass->free (allocator, memory);
}
/* default memory implementation */
typedef struct
{
GstMemory mem;
gsize slice_size;
guint8 *data;
gpointer user_data;
GDestroyNotify notify;
} GstMemoryDefault;
typedef struct
{
GstAllocator parent;
} GstDefaultAllocator;
typedef struct
{
GstAllocatorClass parent_class;
} GstDefaultAllocatorClass;
GType gst_default_allocator_get_type (void);
G_DEFINE_TYPE (GstDefaultAllocator, gst_default_allocator, GST_TYPE_ALLOCATOR);
/* initialize the fields */
static inline void
_default_mem_init (GstMemoryDefault * mem, GstMemoryFlags flags,
GstMemory * parent, gsize slice_size,
gpointer data, gsize maxsize, gsize align, gsize offset, gsize size,
gpointer user_data, GDestroyNotify notify)
{
gst_memory_init (GST_MEMORY_CAST (mem),
flags, _sysmem_allocator, parent, maxsize, align, offset, size);
mem->slice_size = slice_size;
mem->data = data;
mem->user_data = user_data;
mem->notify = notify;
}
/* create a new memory block that manages the given memory */
static inline GstMemoryDefault *
_default_mem_new (GstMemoryFlags flags,
GstMemory * parent, gpointer data, gsize maxsize, gsize align, gsize offset,
gsize size, gpointer user_data, GDestroyNotify notify)
{
GstMemoryDefault *mem;
gsize slice_size;
slice_size = sizeof (GstMemoryDefault);
mem = g_slice_alloc (slice_size);
_default_mem_init (mem, flags, parent, slice_size,
data, maxsize, align, offset, size, user_data, notify);
return mem;
}
/* allocate the memory and structure in one block */
static GstMemoryDefault *
_default_mem_new_block (GstMemoryFlags flags,
gsize maxsize, gsize align, gsize offset, gsize size)
{
GstMemoryDefault *mem;
gsize aoffset, slice_size, padding;
guint8 *data;
/* ensure configured alignment */
align |= gst_memory_alignment;
/* allocate more to compensate for alignment */
maxsize += align;
/* alloc header and data in one block */
slice_size = sizeof (GstMemoryDefault) + maxsize;
mem = g_slice_alloc (slice_size);
if (mem == NULL)
return NULL;
data = (guint8 *) mem + sizeof (GstMemoryDefault);
/* do alignment */
if ((aoffset = ((guintptr) data & align))) {
aoffset = (align + 1) - aoffset;
data += aoffset;
maxsize -= aoffset;
}
if (offset && (flags & GST_MEMORY_FLAG_ZERO_PREFIXED))
memset (data, 0, offset);
padding = maxsize - (offset + size);
if (padding && (flags & GST_MEMORY_FLAG_ZERO_PADDED))
memset (data + offset + size, 0, padding);
_default_mem_init (mem, flags, NULL, slice_size, data, maxsize,
align, offset, size, NULL, NULL);
return mem;
}
static gpointer
_default_mem_map (GstMemoryDefault * mem, gsize maxsize, GstMapFlags flags)
{
return mem->data;
}
static gboolean
_default_mem_unmap (GstMemoryDefault * mem)
{
return TRUE;
}
static GstMemoryDefault *
_default_mem_copy (GstMemoryDefault * mem, gssize offset, gsize size)
{
GstMemoryDefault *copy;
if (size == -1)
size = mem->mem.size > offset ? mem->mem.size - offset : 0;
copy =
_default_mem_new_block (0, mem->mem.maxsize, 0, mem->mem.offset + offset,
size);
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
"memcpy %" G_GSIZE_FORMAT " memory %p -> %p", mem->mem.maxsize, mem,
copy);
memcpy (copy->data, mem->data, mem->mem.maxsize);
return copy;
}
static GstMemoryDefault *
_default_mem_share (GstMemoryDefault * mem, gssize offset, gsize size)
{
GstMemoryDefault *sub;
GstMemory *parent;
/* find the real parent */
if ((parent = mem->mem.parent) == NULL)
parent = (GstMemory *) mem;
if (size == -1)
size = mem->mem.size - offset;
/* the shared memory is always readonly */
sub =
_default_mem_new (GST_MINI_OBJECT_FLAGS (parent) |
GST_MINI_OBJECT_FLAG_LOCK_READONLY, parent, mem->data, mem->mem.maxsize,
mem->mem.align, mem->mem.offset + offset, size, NULL, NULL);
return sub;
}
static gboolean
_default_mem_is_span (GstMemoryDefault * mem1, GstMemoryDefault * mem2,
gsize * offset)
{
if (offset) {
GstMemoryDefault *parent;
parent = (GstMemoryDefault *) mem1->mem.parent;
*offset = mem1->mem.offset - parent->mem.offset;
}
/* and memory is contiguous */
return mem1->data + mem1->mem.offset + mem1->mem.size ==
mem2->data + mem2->mem.offset;
}
static GstMemory *
default_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params, gpointer user_data)
{
gsize maxsize = size + params->prefix + params->padding;
return (GstMemory *) _default_mem_new_block (params->flags,
maxsize, params->align, params->prefix, size);
}
static void
default_free (GstAllocator * allocator, GstMemory * mem)
{
GstMemoryDefault *dmem = (GstMemoryDefault *) mem;
if (dmem->notify)
dmem->notify (dmem->user_data);
g_slice_free1 (dmem->slice_size, mem);
}
static void
gst_default_allocator_finalize (GObject * obj)
{
g_warning ("The default memory allocator was freed!");
}
static void
gst_default_allocator_class_init (GstDefaultAllocatorClass * klass)
{
GObjectClass *gobject_class;
GstAllocatorClass *allocator_class;
gobject_class = (GObjectClass *) klass;
allocator_class = (GstAllocatorClass *) klass;
gobject_class->finalize = gst_default_allocator_finalize;
allocator_class->alloc = default_alloc;
allocator_class->free = default_free;
}
static void
gst_default_allocator_init (GstDefaultAllocator * allocator)
{
GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
GST_CAT_DEBUG (GST_CAT_MEMORY, "init allocator %p", allocator);
alloc->mem_type = GST_ALLOCATOR_SYSMEM;
alloc->mem_map = (GstMemoryMapFunction) _default_mem_map;
alloc->mem_unmap = (GstMemoryUnmapFunction) _default_mem_unmap;
alloc->mem_copy = (GstMemoryCopyFunction) _default_mem_copy;
alloc->mem_share = (GstMemoryShareFunction) _default_mem_share;
alloc->mem_is_span = (GstMemoryIsSpanFunction) _default_mem_is_span;
}
void
_priv_gst_memory_initialize (void)
{
g_rw_lock_init (&lock);
allocators = g_hash_table_new (g_str_hash, g_str_equal);
#ifdef HAVE_GETPAGESIZE
#ifdef MEMORY_ALIGNMENT_PAGESIZE
gst_memory_alignment = getpagesize () - 1;
#endif
#endif
GST_CAT_DEBUG (GST_CAT_MEMORY, "memory alignment: %" G_GSIZE_FORMAT,
gst_memory_alignment);
_sysmem_allocator = g_object_new (gst_default_allocator_get_type (), NULL);
gst_allocator_register (GST_ALLOCATOR_SYSMEM,
gst_object_ref (_sysmem_allocator));
_default_allocator = gst_object_ref (_sysmem_allocator);
}
/**
* gst_memory_new_wrapped:
* @flags: #GstMemoryFlags
* @data: data to wrap
* @maxsize: allocated size of @data
* @offset: offset in @data
* @size: size of valid data
* @user_data: user_data
* @notify: called with @user_data when the memory is freed
*
* Allocate a new memory block that wraps the given @data.
*
* The prefix/padding must be filled with 0 if @flags contains
* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED respectively.
*
* Returns: a new #GstMemory.
*/
GstMemory *
gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data,
gsize maxsize, gsize offset, gsize size, gpointer user_data,
GDestroyNotify notify)
{
GstMemoryDefault *mem;
g_return_val_if_fail (data != NULL, NULL);
g_return_val_if_fail (offset + size <= maxsize, NULL);
mem =
_default_mem_new (flags, NULL, data, maxsize, 0, offset, size, user_data,
notify);
return (GstMemory *) mem;
}

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@ -0,0 +1,186 @@
/* GStreamer
* Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.be>
*
* gstallocator.h: Header for memory allocation
*
* 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.
*/
#ifndef __GST_ALLOCATOR_H__
#define __GST_ALLOCATOR_H__
#include <gst/gstmemory.h>
G_BEGIN_DECLS
typedef struct _GstAllocatorPrivate GstAllocatorPrivate;
typedef struct _GstAllocatorClass GstAllocatorClass;
#define GST_TYPE_ALLOCATOR (gst_allocator_get_type())
#define GST_IS_ALLOCATOR(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ALLOCATOR))
#define GST_IS_ALLOCATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ALLOCATOR))
#define GST_ALLOCATOR_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ALLOCATOR, GstAllocatorClass))
#define GST_ALLOCATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ALLOCATOR, GstAllocator))
#define GST_ALLOCATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ALLOCATOR, GstAllocatorClass))
#define GST_ALLOCATOR_CAST(obj) ((GstAllocator *)(obj))
#define GST_TYPE_ALLOCATION_PARAMS (gst_allocation_params_get_type())
GType gst_allocation_params_get_type(void);
typedef struct _GstAllocationParams GstAllocationParams;
/**
* gst_memory_alignment:
*
* The default memory alignment in bytes - 1
* an alignment of 7 would be the same as what malloc() guarantees.
*/
GST_EXPORT gsize gst_memory_alignment;
/**
* GST_ALLOCATOR_SYSMEM:
*
* The allocator name for the default system memory allocator
*/
#define GST_ALLOCATOR_SYSMEM "SystemMemory"
/**
* GstAllocationParams:
* @flags: flags to control allocation
* @align: the desired alignment of the memory
* @prefix: the desired prefix
* @padding: the desired padding
*
* Parameters to control the allocation of memory
*/
struct _GstAllocationParams {
GstMemoryFlags flags;
gsize align;
gsize prefix;
gsize padding;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
#if 0
/**
* GstAllocatorAllocFunction:
* @allocator: a #GstAllocator
* @size: the size
* @params: allocator params
* @user_data: user data
*
* Allocate a new #GstMemory from @allocator that can hold at least @size
* bytes (+ padding) and is aligned to (@align + 1) bytes.
*
* The offset and size of the memory should be set and the prefix/padding must
* be filled with 0 if @params flags contains #GST_MEMORY_FLAG_ZERO_PREFIXED and
* #GST_MEMORY_FLAG_ZERO_PADDED respectively.
*
* @user_data is extra data passed to this function. The default
* gst_allocator_alloc() passes the NULL but other implementations could pass
* custom data.
*
* Returns: a newly allocated #GstMemory. Free with gst_memory_unref()
*/
typedef GstMemory * (*GstAllocatorAllocFunction) (GstAllocator *allocator,
gsize size, GstAllocationParams *params,
gpointer user_data);
#endif
/**
* GstAllocatorFlags:
* @GST_ALLOCATOR_CUSTOM_ALLOC: The allocator has a custom alloc function.
* @GST_ALLOCATOR_FLAG_LAST: first flag that can be used for custom purposes
*
* Flags for allocators.
*/
typedef enum {
GST_ALLOCATOR_FLAG_CUSTOM_ALLOC = (GST_OBJECT_FLAG_LAST << 0),
GST_ALLOCATOR_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 16)
} GstAllocatorFlags;
/**
* GstAllocator:
* @mini_object: parent structure
* @mem_type: the memory type this allocator provides
* @mem_map: the implementation of the GstMemoryMapFunction
* @mem_unmap: the implementation of the GstMemoryUnmapFunction
* @mem_free: the implementation of the GstMemoryFreeFunction
* @mem_copy: the implementation of the GstMemoryCopyFunction
* @mem_share: the implementation of the GstMemoryShareFunction
* @mem_is_span: the implementation of the GstMemoryIsSpanFunction
*
* The #GstAllocator is used to create new memory.
*/
struct _GstAllocator
{
GstObject object;
const gchar *mem_type;
GstMemoryMapFunction mem_map;
GstMemoryUnmapFunction mem_unmap;
GstMemoryCopyFunction mem_copy;
GstMemoryShareFunction mem_share;
GstMemoryIsSpanFunction mem_is_span;
gpointer _gst_reserved[GST_PADDING];
/*< private >*/
GstAllocatorPrivate *priv;
};
struct _GstAllocatorClass {
GstObjectClass object_class;
GstMemory * (*alloc) (GstAllocator *allocator, gsize size,
GstAllocationParams *params, gpointer user_data);
void (*free) (GstAllocator *allocator, GstMemory *memory);
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
GType gst_allocator_get_type(void);
/* allocators */
void gst_allocator_register (const gchar *name, GstAllocator *allocator);
GstAllocator * gst_allocator_find (const gchar *name);
void gst_allocator_set_default (GstAllocator * allocator);
/* allocation parameters */
void gst_allocation_params_init (GstAllocationParams *params);
GstAllocationParams *
gst_allocation_params_copy (const GstAllocationParams *params) G_GNUC_MALLOC;
void gst_allocation_params_free (GstAllocationParams *params);
/* allocating memory blocks */
GstMemory * gst_allocator_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams *params);
void gst_allocator_free (GstAllocator * allocator, GstMemory *mem);
GstMemory * gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data, gsize maxsize,
gsize offset, gsize size, gpointer user_data,
GDestroyNotify notify);
G_END_DECLS
#endif /* __GST_ALLOCATOR_H__ */

2
gst/gstbuffer.h
View file

@ -26,7 +26,7 @@
#include <gst/gstminiobject.h>
#include <gst/gstclock.h>
#include <gst/gstmemory.h>
#include <gst/gstallocator.h>
G_BEGIN_DECLS

8
gst/gstbufferpool.c
View file

@ -199,7 +199,7 @@ gst_buffer_pool_finalize (GObject * object)
gst_structure_free (priv->config);
g_rec_mutex_clear (&priv->rec_lock);
if (priv->allocator)
gst_allocator_unref (priv->allocator);
gst_object_unref (priv->allocator);
G_OBJECT_CLASS (gst_buffer_pool_parent_class)->finalize (object);
}
@ -493,9 +493,9 @@ default_set_config (GstBufferPool * pool, GstStructure * config)
priv->max_buffers = max_buffers;
if (priv->allocator)
gst_allocator_unref (priv->allocator);
gst_object_unref (priv->allocator);
if ((priv->allocator = allocator))
gst_allocator_ref (allocator);
gst_object_ref (allocator);
priv->params = params;
return TRUE;
@ -896,7 +896,7 @@ gst_buffer_pool_config_get_allocator (GstStructure * config,
g_return_val_if_fail (config != NULL, FALSE);
if (allocator)
*allocator = g_value_get_boxed (gst_structure_id_get_value (config,
*allocator = g_value_get_object (gst_structure_id_get_value (config,
GST_QUARK (ALLOCATOR)));
if (params) {
GstAllocationParams *p;

539
gst/gstmemory.c
View file

@ -73,40 +73,6 @@
GST_DEFINE_MINI_OBJECT_TYPE (GstMemory, gst_memory);
GST_DEFINE_MINI_OBJECT_TYPE (GstAllocator, gst_allocator);
G_DEFINE_BOXED_TYPE (GstAllocationParams, gst_allocation_params,
(GBoxedCopyFunc) gst_allocation_params_copy,
(GBoxedFreeFunc) gst_allocation_params_free);
#if defined(MEMORY_ALIGNMENT_MALLOC)
size_t gst_memory_alignment = 7;
#elif defined(MEMORY_ALIGNMENT_PAGESIZE)
/* we fill this in in the _init method */
size_t gst_memory_alignment = 0;
#elif defined(MEMORY_ALIGNMENT)
size_t gst_memory_alignment = MEMORY_ALIGNMENT - 1;
#else
#error "No memory alignment configured"
size_t gst_memory_alignment = 0;
#endif
/* default memory implementation */
typedef struct
{
GstMemory mem;
gsize slice_size;
guint8 *data;
gpointer user_data;
GDestroyNotify notify;
} GstMemoryDefault;
/* the default allocator */
static GstAllocator *_default_allocator;
/* our predefined allocators */
static GstAllocator *_default_mem_impl;
static GstMemory *
_gst_memory_copy (GstMemory * mem)
{
@ -124,7 +90,7 @@ _gst_memory_free (GstMemory * mem)
gst_memory_unref (mem->parent);
}
mem->allocator->info.mem_free (mem);
gst_allocator_free (mem->allocator, mem);
}
/**
@ -167,285 +133,6 @@ gst_memory_init (GstMemory * mem, GstMemoryFlags flags,
offset, size);
}
/* initialize the fields */
static inline void
_default_mem_init (GstMemoryDefault * mem, GstMemoryFlags flags,
GstMemory * parent, gsize slice_size, gpointer data,
gsize maxsize, gsize align, gsize offset, gsize size,
gpointer user_data, GDestroyNotify notify)
{
gst_memory_init (GST_MEMORY_CAST (mem),
flags, _default_mem_impl, parent, maxsize, align, offset, size);
mem->slice_size = slice_size;
mem->data = data;
mem->user_data = user_data;
mem->notify = notify;
}
/* create a new memory block that manages the given memory */
static inline GstMemoryDefault *
_default_mem_new (GstMemoryFlags flags, GstMemory * parent, gpointer data,
gsize maxsize, gsize align, gsize offset, gsize size, gpointer user_data,
GDestroyNotify notify)
{
GstMemoryDefault *mem;
gsize slice_size;
slice_size = sizeof (GstMemoryDefault);
mem = g_slice_alloc (slice_size);
_default_mem_init (mem, flags, parent, slice_size,
data, maxsize, align, offset, size, user_data, notify);
return mem;
}
/* allocate the memory and structure in one block */
static GstMemoryDefault *
_default_mem_new_block (GstMemoryFlags flags, gsize maxsize, gsize align,
gsize offset, gsize size)
{
GstMemoryDefault *mem;
gsize aoffset, slice_size, padding;
guint8 *data;
/* ensure configured alignment */
align |= gst_memory_alignment;
/* allocate more to compensate for alignment */
maxsize += align;
/* alloc header and data in one block */
slice_size = sizeof (GstMemoryDefault) + maxsize;
mem = g_slice_alloc (slice_size);
if (mem == NULL)
return NULL;
data = (guint8 *) mem + sizeof (GstMemoryDefault);
/* do alignment */
if ((aoffset = ((guintptr) data & align))) {
aoffset = (align + 1) - aoffset;
data += aoffset;
maxsize -= aoffset;
}
if (offset && (flags & GST_MEMORY_FLAG_ZERO_PREFIXED))
memset (data, 0, offset);
padding = maxsize - (offset + size);
if (padding && (flags & GST_MEMORY_FLAG_ZERO_PADDED))
memset (data + offset + size, 0, padding);
_default_mem_init (mem, flags, NULL, slice_size, data, maxsize,
align, offset, size, NULL, NULL);
return mem;
}
static GstMemory *
_default_alloc_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params, gpointer user_data)
{
gsize maxsize = size + params->prefix + params->padding;
return (GstMemory *) _default_mem_new_block (params->flags,
maxsize, params->align, params->prefix, size);
}
static gpointer
_default_mem_map (GstMemoryDefault * mem, gsize maxsize, GstMapFlags flags)
{
return mem->data;
}
static gboolean
_default_mem_unmap (GstMemoryDefault * mem)
{
return TRUE;
}
static void
_default_mem_free (GstMemoryDefault * mem)
{
if (mem->notify)
mem->notify (mem->user_data);
g_slice_free1 (mem->slice_size, mem);
}
static GstMemoryDefault *
_default_mem_copy (GstMemoryDefault * mem, gssize offset, gsize size)
{
GstMemoryDefault *copy;
if (size == -1)
size = mem->mem.size > offset ? mem->mem.size - offset : 0;
copy =
_default_mem_new_block (0, mem->mem.maxsize, 0, mem->mem.offset + offset,
size);
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
"memcpy %" G_GSIZE_FORMAT " memory %p -> %p", mem->mem.maxsize, mem,
copy);
memcpy (copy->data, mem->data, mem->mem.maxsize);
return copy;
}
static GstMemoryDefault *
_default_mem_share (GstMemoryDefault * mem, gssize offset, gsize size)
{
GstMemoryDefault *sub;
GstMemory *parent;
/* find the real parent */
if ((parent = mem->mem.parent) == NULL)
parent = (GstMemory *) mem;
if (size == -1)
size = mem->mem.size - offset;
/* the shared memory is always readonly */
sub =
_default_mem_new (GST_MINI_OBJECT_FLAGS (parent) |
GST_MINI_OBJECT_FLAG_LOCK_READONLY, parent, mem->data, mem->mem.maxsize,
mem->mem.align, mem->mem.offset + offset, size, NULL, NULL);
return sub;
}
static gboolean
_default_mem_is_span (GstMemoryDefault * mem1, GstMemoryDefault * mem2,
gsize * offset)
{
if (offset) {
GstMemoryDefault *parent;
parent = (GstMemoryDefault *) mem1->mem.parent;
*offset = mem1->mem.offset - parent->mem.offset;
}
/* and memory is contiguous */
return mem1->data + mem1->mem.offset + mem1->mem.size ==
mem2->data + mem2->mem.offset;
}
static GstMemory *
_fallback_mem_copy (GstMemory * mem, gssize offset, gssize size)
{
GstMemory *copy;
GstMapInfo sinfo, dinfo;
GstAllocationParams params = { 0, 0, 0, mem->align, };
if (!gst_memory_map (mem, &sinfo, GST_MAP_READ))
return NULL;
if (size == -1)
size = sinfo.size > offset ? sinfo.size - offset : 0;
/* use the same allocator as the memory we copy */
copy = gst_allocator_alloc (mem->allocator, size, &params);
if (!gst_memory_map (copy, &dinfo, GST_MAP_WRITE)) {
GST_CAT_WARNING (GST_CAT_MEMORY, "could not write map memory %p", copy);
gst_memory_unmap (mem, &sinfo);
return NULL;
}
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
"memcpy %" G_GSSIZE_FORMAT " memory %p -> %p", size, mem, copy);
memcpy (dinfo.data, sinfo.data + offset, size);
gst_memory_unmap (copy, &dinfo);
gst_memory_unmap (mem, &sinfo);
return copy;
}
static gboolean
_fallback_mem_is_span (GstMemory * mem1, GstMemory * mem2, gsize * offset)
{
return FALSE;
}
static GRWLock lock;
static GHashTable *allocators;
static void
_priv_sysmem_free (GstMiniObject * obj)
{
g_warning ("The default memory allocator was freed!");
}
void
_priv_gst_memory_initialize (void)
{
static const GstMemoryInfo _mem_info = {
GST_ALLOCATOR_SYSMEM,
(GstAllocatorAllocFunction) _default_alloc_alloc,
(GstMemoryMapFunction) _default_mem_map,
(GstMemoryUnmapFunction) _default_mem_unmap,
(GstMemoryFreeFunction) _default_mem_free,
(GstMemoryCopyFunction) _default_mem_copy,
(GstMemoryShareFunction) _default_mem_share,
(GstMemoryIsSpanFunction) _default_mem_is_span,
};
g_rw_lock_init (&lock);
allocators = g_hash_table_new (g_str_hash, g_str_equal);
#ifdef HAVE_GETPAGESIZE
#ifdef MEMORY_ALIGNMENT_PAGESIZE
gst_memory_alignment = getpagesize () - 1;
#endif
#endif
GST_CAT_DEBUG (GST_CAT_MEMORY, "memory alignment: %" G_GSIZE_FORMAT,
gst_memory_alignment);
_default_mem_impl = g_slice_new (GstAllocator);
gst_allocator_init (_default_mem_impl, 0, &_mem_info, _priv_sysmem_free);
_default_allocator = gst_allocator_ref (_default_mem_impl);
gst_allocator_register (GST_ALLOCATOR_SYSMEM,
gst_allocator_ref (_default_mem_impl));
}
/**
* gst_memory_new_wrapped:
* @flags: #GstMemoryFlags
* @data: data to wrap
* @maxsize: allocated size of @data
* @offset: offset in @data
* @size: size of valid data
* @user_data: user_data
* @notify: called with @user_data when the memory is freed
*
* Allocate a new memory block that wraps the given @data.
*
* The prefix/padding must be filled with 0 if @flags contains
* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED respectively.
*
* Returns: a new #GstMemory.
*/
GstMemory *
gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data,
gsize maxsize, gsize offset, gsize size, gpointer user_data,
GDestroyNotify notify)
{
GstMemoryDefault *mem;
g_return_val_if_fail (data != NULL, NULL);
g_return_val_if_fail (offset + size <= maxsize, NULL);
mem =
_default_mem_new (flags, NULL, data, maxsize, 0, offset, size, user_data,
notify);
return (GstMemory *) mem;
}
/**
* gst_memory_get_sizes:
* @mem: a #GstMemory
@ -580,7 +267,7 @@ gst_memory_map (GstMemory * mem, GstMapInfo * info, GstMapFlags flags)
if (!gst_memory_lock (mem, flags))
goto lock_failed;
info->data = mem->allocator->info.mem_map (mem, mem->maxsize, flags);
info->data = mem->allocator->mem_map (mem, mem->maxsize, flags);
if (G_UNLIKELY (info->data == NULL))
goto error;
@ -622,7 +309,7 @@ gst_memory_unmap (GstMemory * mem, GstMapInfo * info)
g_return_if_fail (info != NULL);
g_return_if_fail (info->memory == mem);
mem->allocator->info.mem_unmap (mem);
mem->allocator->mem_unmap (mem);
gst_memory_unlock (mem, info->flags);
}
@ -645,7 +332,7 @@ gst_memory_copy (GstMemory * mem, gssize offset, gssize size)
g_return_val_if_fail (mem != NULL, NULL);
copy = mem->allocator->info.mem_copy (mem, offset, size);
copy = mem->allocator->mem_copy (mem, offset, size);
return copy;
}
@ -672,7 +359,7 @@ gst_memory_share (GstMemory * mem, gssize offset, gssize size)
g_return_val_if_fail (!GST_MEMORY_FLAG_IS_SET (mem, GST_MEMORY_FLAG_NO_SHARE),
NULL);
shared = mem->allocator->info.mem_share (mem, offset, size);
shared = mem->allocator->mem_share (mem, offset, size);
return shared;
}
@ -707,222 +394,8 @@ gst_memory_is_span (GstMemory * mem1, GstMemory * mem2, gsize * offset)
return FALSE;
/* and memory is contiguous */
if (!mem1->allocator->info.mem_is_span (mem1, mem2, offset))
if (!mem1->allocator->mem_is_span (mem1, mem2, offset))
return FALSE;
return TRUE;
}
static GstAllocator *
_gst_allocator_copy (GstAllocator * allocator)
{
return gst_allocator_ref (allocator);
}
/**
* gst_allocator_init:
* @allocator: a #GstAllocator
* @flags: #GstAllocatorFlags
* @info: a #GstMemoryInfo
* @free_func: a function to free @allocator
*
* Initialize a new memory allocator. The caller should have allocated the
* memory to hold at least sizeof (GstAllocator) bytes.
*
* All functions in @info are mandatory exept the copy and is_span
* functions, which will have a default implementation when left NULL.
*
* Returns: a new #GstAllocator.
*/
void
gst_allocator_init (GstAllocator * allocator, GstAllocatorFlags flags,
const GstMemoryInfo * info, GstMiniObjectFreeFunction free_func)
{
g_return_if_fail (allocator != NULL);
g_return_if_fail (info != NULL);
g_return_if_fail (info->alloc != NULL);
g_return_if_fail (info->mem_map != NULL);
g_return_if_fail (info->mem_unmap != NULL);
g_return_if_fail (info->mem_free != NULL);
g_return_if_fail (info->mem_share != NULL);
gst_mini_object_init (GST_MINI_OBJECT_CAST (allocator), flags,
GST_TYPE_ALLOCATOR, (GstMiniObjectCopyFunction) _gst_allocator_copy, NULL,
(GstMiniObjectFreeFunction) free_func);
allocator->info = *info;
#define INSTALL_FALLBACK(_t) \
if (allocator->info._t == NULL) allocator->info._t = _fallback_ ##_t;
INSTALL_FALLBACK (mem_copy);
INSTALL_FALLBACK (mem_is_span);
#undef INSTALL_FALLBACK
GST_CAT_DEBUG (GST_CAT_MEMORY, "init allocator %p", allocator);
}
/**
* gst_allocator_register:
* @name: the name of the allocator
* @allocator: (transfer full): #GstAllocator
*
* Registers the memory @allocator with @name. This function takes ownership of
* @allocator.
*/
void
gst_allocator_register (const gchar * name, GstAllocator * allocator)
{
g_return_if_fail (name != NULL);
g_return_if_fail (allocator != NULL);
GST_CAT_DEBUG (GST_CAT_MEMORY, "registering allocator %p with name \"%s\"",
allocator, name);
g_rw_lock_writer_lock (&lock);
g_hash_table_insert (allocators, (gpointer) name, (gpointer) allocator);
g_rw_lock_writer_unlock (&lock);
}
/**
* gst_allocator_find:
* @name: the name of the allocator
*
* Find a previously registered allocator with @name. When @name is NULL, the
* default allocator will be returned.
*
* Returns: (transfer full): a #GstAllocator or NULL when the allocator with @name was not
* registered. Use gst_allocator_unref() to release the allocator after usage.
*/
GstAllocator *
gst_allocator_find (const gchar * name)
{
GstAllocator *allocator;
g_rw_lock_reader_lock (&lock);
if (name) {
allocator = g_hash_table_lookup (allocators, (gconstpointer) name);
} else {
allocator = _default_allocator;
}
if (allocator)
gst_allocator_ref (allocator);
g_rw_lock_reader_unlock (&lock);
return allocator;
}
/**
* gst_allocator_set_default:
* @allocator: (transfer full): a #GstAllocator
*
* Set the default allocator. This function takes ownership of @allocator.
*/
void
gst_allocator_set_default (GstAllocator * allocator)
{
GstAllocator *old;
g_return_if_fail (allocator != NULL);
g_rw_lock_writer_lock (&lock);
old = _default_allocator;
_default_allocator = allocator;
g_rw_lock_writer_unlock (&lock);
if (old)
gst_allocator_unref (old);
}
/**
* gst_allocation_params_init:
* @params: a #GstAllocationParams
*
* Initialize @params to its default values
*/
void
gst_allocation_params_init (GstAllocationParams * params)
{
g_return_if_fail (params != NULL);
memset (params, 0, sizeof (GstAllocationParams));
}
/**
* gst_allocation_params_copy:
* @params: (transfer none): a #GstAllocationParams
*
* Create a copy of @params.
*
* Free-function: gst_allocation_params_free
*
* Returns: (transfer full): a new ##GstAllocationParams, free with
* gst_allocation_params_free().
*/
GstAllocationParams *
gst_allocation_params_copy (const GstAllocationParams * params)
{
GstAllocationParams *result = NULL;
if (params) {
result =
(GstAllocationParams *) g_slice_copy (sizeof (GstAllocationParams),
params);
}
return result;
}
/**
* gst_allocation_params_free:
* @params: (in) (transfer full): a #GstAllocationParams
*
* Free @params
*/
void
gst_allocation_params_free (GstAllocationParams * params)
{
g_slice_free (GstAllocationParams, params);
}
/**
* gst_allocator_alloc:
* @allocator: (transfer none) (allow-none): a #GstAllocator to use
* @size: size of the visible memory area
* @params: (transfer none) (allow-none): optional parameters
*
* Use @allocator to allocate a new memory block with memory that is at least
* @size big.
*
* The optional @params can specify the prefix and padding for the memory. If
* NULL is passed, no flags, no extra prefix/padding and a default alignment is
* used.
*
* The prefix/padding will be filled with 0 if flags contains
* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED respectively.
*
* When @allocator is NULL, the default allocator will be used.
*
* The alignment in @params is given as a bitmask so that @align + 1 equals
* the amount of bytes to align to. For example, to align to 8 bytes,
* use an alignment of 7.
*
* Returns: (transfer full): a new #GstMemory.
*/
GstMemory *
gst_allocator_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params)
{
GstMemory *mem;
static GstAllocationParams defparams = { 0, 0, 0, 0, };
if (params) {
g_return_val_if_fail (((params->align + 1) & params->align) == 0, NULL);
} else {
params = &defparams;
}
if (allocator == NULL)
allocator = _default_allocator;
mem = allocator->info.alloc (allocator, size, params, NULL);
return mem;
}

198
gst/gstmemory.h
View file

@ -32,24 +32,8 @@ G_BEGIN_DECLS
#define GST_TYPE_MEMORY (gst_memory_get_type())
GType gst_memory_get_type(void);
#define GST_TYPE_ALLOCATOR (gst_allocator_get_type())
GType gst_allocator_get_type(void);
#define GST_TYPE_ALLOCATION_PARAMS (gst_allocation_params_get_type())
GType gst_allocation_params_get_type(void);
typedef struct _GstMemory GstMemory;
typedef struct _GstMemoryInfo GstMemoryInfo;
typedef struct _GstAllocator GstAllocator;
typedef struct _GstAllocationParams GstAllocationParams;
/**
* gst_memory_alignment:
*
* The default memory alignment in bytes - 1
* an alignment of 7 would be the same as what malloc() guarantees.
*/
GST_EXPORT gsize gst_memory_alignment;
#define GST_MEMORY_CAST(mem) ((GstMemory *)(mem))
@ -167,6 +151,7 @@ typedef enum {
GST_MAP_FLAG_LAST = (1 << 16)
} GstMapFlags;
/**
* GST_MAP_READWRITE:
*
@ -205,56 +190,6 @@ typedef struct {
*/
#define GST_MAP_INFO_INIT { NULL, 0, NULL, 0, 0, }
/**
* GST_ALLOCATOR_SYSMEM:
*
* The allocator name for the default system memory allocator
*/
#define GST_ALLOCATOR_SYSMEM "SystemMemory"
/**
* GstAllocationParams:
* @flags: flags to control allocation
* @align: the desired alignment of the memory
* @prefix: the desired prefix
* @padding: the desired padding
*
* Parameters to control the allocation of memory
*/
struct _GstAllocationParams {
GstMemoryFlags flags;
gsize align;
gsize prefix;
gsize padding;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/**
* GstAllocatorAllocFunction:
* @allocator: a #GstAllocator
* @size: the size
* @params: allocator params
* @user_data: user data
*
* Allocate a new #GstMemory from @allocator that can hold at least @size
* bytes (+ padding) and is aligned to (@align + 1) bytes.
*
* The offset and size of the memory should be set and the prefix/padding must
* be filled with 0 if @params flags contains #GST_MEMORY_FLAG_ZERO_PREFIXED and
* #GST_MEMORY_FLAG_ZERO_PADDED respectively.
*
* @user_data is extra data passed to this function. The default
* gst_allocator_alloc() passes the NULL but other implementations could pass
* custom data.
*
* Returns: a newly allocated #GstMemory. Free with gst_memory_unref()
*/
typedef GstMemory * (*GstAllocatorAllocFunction) (GstAllocator *allocator,
gsize size, GstAllocationParams *params,
gpointer user_data);
/**
* GstMemoryMapFunction:
* @mem: a #GstMemory
@ -280,15 +215,6 @@ typedef gpointer (*GstMemoryMapFunction) (GstMemory *mem, gsize maxsize
*/
typedef void (*GstMemoryUnmapFunction) (GstMemory *mem);
/**
* GstMemoryFreeFunction:
* @mem: a #GstMemory
*
* Free the memory used by @mem. This function is usually called when the
* refcount of the @mem has reached 0.
*/
typedef void (*GstMemoryFreeFunction) (GstMemory *mem);
/**
* GstMemoryCopyFunction:
* @mem: a #GstMemory
@ -331,132 +257,10 @@ typedef GstMemory * (*GstMemoryShareFunction) (GstMemory *mem, gssize offset
*/
typedef gboolean (*GstMemoryIsSpanFunction) (GstMemory *mem1, GstMemory *mem2, gsize *offset);
/**
* GstAllocatorFlags:
* @GST_ALLOCATOR_CUSTOM_ALLOC: The allocator has a custom alloc function.
* @GST_ALLOCATOR_FLAG_LAST: first flag that can be used for custom purposes
*
* Flags for allocators.
*/
typedef enum {
GST_ALLOCATOR_FLAG_CUSTOM_ALLOC = (GST_MINI_OBJECT_FLAG_LAST << 0),
GST_ALLOCATOR_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 16)
} GstAllocatorFlags;
/**
* GstMemoryInfo:
* @mem_type: the memory type this allocator provides
* @alloc: the implementation of the GstAllocatorAllocFunction
* @mem_map: the implementation of the GstMemoryMapFunction
* @mem_unmap: the implementation of the GstMemoryUnmapFunction
* @mem_free: the implementation of the GstMemoryFreeFunction
* @mem_copy: the implementation of the GstMemoryCopyFunction
* @mem_share: the implementation of the GstMemoryShareFunction
* @mem_is_span: the implementation of the GstMemoryIsSpanFunction
*
* The #GstMemoryInfo is used to initialize new memory allocators and contain
* the implementations for various memory operations.
*/
struct _GstMemoryInfo {
const gchar *mem_type;
GstAllocatorAllocFunction alloc;
GstMemoryMapFunction mem_map;
GstMemoryUnmapFunction mem_unmap;
GstMemoryFreeFunction mem_free;
GstMemoryCopyFunction mem_copy;
GstMemoryShareFunction mem_share;
GstMemoryIsSpanFunction mem_is_span;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/**
* GstAllocator:
* @mini_object: parent structure
* @info: a #GstMemoryInfo with the implementation
*
* The #GstAllocator is used to create new memory and should be
* initialized with gst_allocator_init().
*/
struct _GstAllocator
{
GstMiniObject mini_object;
GstMemoryInfo info;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/* allocators */
void gst_allocator_init (GstAllocator * allocator,
GstAllocatorFlags flags,
const GstMemoryInfo *info,
GstMiniObjectFreeFunction free_func);
/**
* gst_allocator_ref:
* @allocator: The allocator to refcount
*
* Increase the refcount of this allocator.
*
* Returns: (transfer full): @allocator (for convenience when doing assignments)
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC GstAllocator * gst_allocator_ref (GstAllocator * allocator);
#endif
static inline GstAllocator *
gst_allocator_ref (GstAllocator * allocator)
{
return (GstAllocator *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (allocator));
}
/**
* gst_allocator_unref:
* @allocator: (transfer full): the allocator to refcount
*
* Decrease the refcount of an allocator, freeing it if the refcount reaches 0.
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC void gst_allocator_unref (GstAllocator * allocator);
#endif
static inline void
gst_allocator_unref (GstAllocator * allocator)
{
gst_mini_object_unref (GST_MINI_OBJECT_CAST (allocator));
}
void gst_allocator_register (const gchar *name, GstAllocator *allocator);
GstAllocator * gst_allocator_find (const gchar *name);
void gst_allocator_set_default (GstAllocator * allocator);
/* allocating memory blocks */
void gst_allocation_params_init (GstAllocationParams *params);
GstAllocationParams *
gst_allocation_params_copy (const GstAllocationParams *params) G_GNUC_MALLOC;
void gst_allocation_params_free (GstAllocationParams *params);
GstMemory * gst_allocator_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams *params);
GstMemory * gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data, gsize maxsize,
gsize offset, gsize size, gpointer user_data,
GDestroyNotify notify);
void gst_memory_init (GstMemory *mem, GstMemoryFlags flags,
GstAllocator *allocator, GstMemory *parent,
gsize maxsize, gsize align,
gsize offset, gsize size);
/* refcounting */
/**
* gst_memory_ref:

8
gst/gstquery.c
View file

@ -1837,7 +1837,7 @@ static void
allocation_param_free (AllocationParam * ap)
{
if (ap->allocator)
gst_allocator_unref (ap->allocator);
gst_object_unref (ap->allocator);
}
/**
@ -1865,7 +1865,7 @@ gst_query_add_allocation_param (GstQuery * query, GstAllocator * allocator,
sizeof (AllocationParam), (GDestroyNotify) allocation_param_free);
if ((ap.allocator = allocator))
gst_allocator_ref (allocator);
gst_object_ref (allocator);
if (params)
ap.params = *params;
else
@ -1930,7 +1930,7 @@ gst_query_parse_nth_allocation_param (GstQuery * query, guint index,
if (allocator)
if ((*allocator = ap->allocator))
gst_allocator_ref (*allocator);
gst_object_ref (*allocator);
if (params)
*params = ap->params;
}
@ -1964,7 +1964,7 @@ gst_query_set_nth_allocation_param (GstQuery * query, guint index,
allocation_param_free (old);
if ((ap.allocator = allocator))
gst_allocator_ref (allocator);
gst_object_ref (allocator);
if (params)
ap.params = *params;
else

1
gst/gstquery.h
View file

@ -33,6 +33,7 @@
#include <gst/gststructure.h>
#include <gst/gstformat.h>
#include <gst/gstpad.h>
#include <gst/gstallocator.h>
#include <gst/gsttoc.h>
G_BEGIN_DECLS

4
libs/gst/base/gstbasesrc.c
View file

@ -2787,7 +2787,7 @@ gst_base_src_set_allocation (GstBaseSrc * basesrc, GstBufferPool * pool,
gst_object_unref (oldpool);
}
if (oldalloc) {
gst_allocator_unref (oldalloc);
gst_object_unref (oldalloc);
}
return TRUE;
@ -2870,7 +2870,7 @@ gst_base_src_decide_allocation_default (GstBaseSrc * basesrc, GstQuery * query)
else
gst_query_add_allocation_param (query, allocator, &params);
if (allocator)
gst_allocator_unref (allocator);
gst_object_unref (allocator);
if (pool) {
gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);

4
libs/gst/base/gstbasetransform.c
View file

@ -785,7 +785,7 @@ gst_base_transform_set_allocation (GstBaseTransform * trans,
gst_object_unref (oldpool);
}
if (oldalloc) {
gst_allocator_unref (oldalloc);
gst_object_unref (oldalloc);
}
if (oldquery) {
gst_query_unref (oldquery);
@ -883,7 +883,7 @@ gst_base_transform_default_decide_allocation (GstBaseTransform * trans,
else
gst_query_add_allocation_param (query, allocator, &params);
if (allocator)
gst_allocator_unref (allocator);
gst_object_unref (allocator);
if (pool) {
gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);

4
tests/examples/memory/memory_test.c
View file

@ -26,7 +26,7 @@ main (int argc, char **argv)
gst_memory_unmap (mem, &info);
gst_memory_unref (mem);
gst_allocator_unref (alloc);
gst_object_unref (alloc);
/* allocator with custom alloc API */
my_vidmem_init ();
@ -48,7 +48,7 @@ main (int argc, char **argv)
gst_memory_unmap (mem, &info);
gst_memory_unref (mem);
gst_allocator_unref (alloc);
gst_object_unref (alloc);
return 0;
}

73
tests/examples/memory/my-memory.c
View file

@ -19,8 +19,6 @@
#include "my-memory.h"
static GstAllocator *_my_allocator;
typedef struct
{
GstMemory mem;
@ -31,7 +29,7 @@ typedef struct
static GstMemory *
_my_alloc_alloc (GstAllocator * allocator, gsize size,
_my_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params, gpointer user_data)
{
MyMemory *mem;
@ -49,6 +47,16 @@ _my_alloc_alloc (GstAllocator * allocator, gsize size,
return (GstMemory *) mem;
}
static void
_my_free (GstAllocator * allocator, GstMemory * mem)
{
MyMemory *mmem = (MyMemory *) mem;
g_free (mmem->data);
g_slice_free (MyMemory, mmem);
GST_DEBUG ("%p: freed", mmem);
}
static gpointer
_my_mem_map (MyMemory * mem, gsize maxsize, GstMapFlags flags)
{
@ -78,14 +86,6 @@ _my_mem_unmap (MyMemory * mem)
return TRUE;
}
static void
_my_mem_free (MyMemory * mem)
{
g_free (mem->data);
g_slice_free (MyMemory, mem);
GST_DEBUG ("%p: freed", mem);
}
static MyMemory *
_my_mem_share (MyMemory * mem, gssize offset, gsize size)
{
@ -114,28 +114,47 @@ _my_mem_share (MyMemory * mem, gssize offset, gsize size)
return sub;
}
static void
free_allocator (GstMiniObject * obj)
typedef struct
{
g_slice_free (GstAllocator, (GstAllocator *) obj);
GstAllocator parent;
} MyMemoryAllocator;
typedef struct
{
GstAllocatorClass parent_class;
} MyMemoryAllocatorClass;
GType my_memory_allocator_get_type (void);
G_DEFINE_TYPE (MyMemoryAllocator, my_memory_allocator, GST_TYPE_ALLOCATOR);
static void
my_memory_allocator_class_init (MyMemoryAllocatorClass * klass)
{
GstAllocatorClass *allocator_class;
allocator_class = (GstAllocatorClass *) klass;
allocator_class->alloc = _my_alloc;
allocator_class->free = _my_free;
}
static void
my_memory_allocator_init (MyMemoryAllocator * allocator)
{
GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
alloc->mem_type = "MyMemory";
alloc->mem_map = (GstMemoryMapFunction) _my_mem_map;
alloc->mem_unmap = (GstMemoryUnmapFunction) _my_mem_unmap;
alloc->mem_share = (GstMemoryShareFunction) _my_mem_share;
}
void
my_memory_init (void)
{
static const GstMemoryInfo info = {
"MyMemory",
(GstAllocatorAllocFunction) _my_alloc_alloc,
(GstMemoryMapFunction) _my_mem_map,
(GstMemoryUnmapFunction) _my_mem_unmap,
(GstMemoryFreeFunction) _my_mem_free,
(GstMemoryCopyFunction) NULL,
(GstMemoryShareFunction) _my_mem_share,
(GstMemoryIsSpanFunction) NULL,
};
GstAllocator *allocator;
_my_allocator = g_slice_new (GstAllocator);
gst_allocator_init (_my_allocator, 0, &info, free_allocator);
allocator = g_object_new (my_memory_allocator_get_type (), NULL);
gst_allocator_register ("MyMemory", gst_allocator_ref (_my_allocator));
gst_allocator_register ("MyMemory", allocator);
}

1
tests/examples/memory/my-memory.h
View file

@ -19,6 +19,7 @@
#include <gst/gst.h>
/* example of an allocator that delays allocation of the memory
* until the memory is mapped */
void my_memory_init (void);

72
tests/examples/memory/my-vidmem.c
View file

@ -34,7 +34,7 @@ typedef struct
static GstMemory *
_my_alloc_alloc (GstAllocator * allocator, gsize size,
_my_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params, gpointer user_data)
{
g_warning ("Use my_vidmem_alloc() to allocate from this allocator");
@ -42,6 +42,16 @@ _my_alloc_alloc (GstAllocator * allocator, gsize size,
return NULL;
}
static void
_my_free (GstAllocator * allocator, GstMemory * mem)
{
MyVidmem *vmem = (MyVidmem *) mem;
g_free (vmem->data);
g_slice_free (MyVidmem, vmem);
GST_DEBUG ("%p: freed", vmem);
}
static gpointer
_my_vidmem_map (MyVidmem * mem, gsize maxsize, GstMapFlags flags)
{
@ -71,14 +81,6 @@ _my_vidmem_unmap (MyVidmem * mem)
return TRUE;
}
static void
_my_vidmem_free (MyVidmem * mem)
{
g_free (mem->data);
g_slice_free (MyVidmem, mem);
GST_DEBUG ("%p: freed", mem);
}
static MyVidmem *
_my_vidmem_share (MyVidmem * mem, gssize offset, gsize size)
{
@ -107,33 +109,49 @@ _my_vidmem_share (MyVidmem * mem, gssize offset, gsize size)
return sub;
}
static void
free_allocator (GstMiniObject * obj)
typedef struct
{
g_slice_free (GstAllocator, (GstAllocator *) obj);
GstAllocator parent;
} MyVidmemAllocator;
typedef struct
{
GstAllocatorClass parent_class;
} MyVidmemAllocatorClass;
GType my_vidmem_allocator_get_type (void);
G_DEFINE_TYPE (MyVidmemAllocator, my_vidmem_allocator, GST_TYPE_ALLOCATOR);
static void
my_vidmem_allocator_class_init (MyVidmemAllocatorClass * klass)
{
GstAllocatorClass *allocator_class;
allocator_class = (GstAllocatorClass *) klass;
allocator_class->alloc = _my_alloc;
allocator_class->free = _my_free;
}
static void
my_vidmem_allocator_init (MyVidmemAllocator * allocator)
{
GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
alloc->mem_type = "MyVidmem";
alloc->mem_map = (GstMemoryMapFunction) _my_vidmem_map;
alloc->mem_unmap = (GstMemoryUnmapFunction) _my_vidmem_unmap;
alloc->mem_share = (GstMemoryShareFunction) _my_vidmem_share;
}
void
my_vidmem_init (void)
{
static const GstMemoryInfo info = {
"MyVidmem",
(GstAllocatorAllocFunction) _my_alloc_alloc,
(GstMemoryMapFunction) _my_vidmem_map,
(GstMemoryUnmapFunction) _my_vidmem_unmap,
(GstMemoryFreeFunction) _my_vidmem_free,
(GstMemoryCopyFunction) NULL,
(GstMemoryShareFunction) _my_vidmem_share,
(GstMemoryIsSpanFunction) NULL,
};
_my_allocator = g_object_new (my_vidmem_allocator_get_type (), NULL);
_my_allocator = g_slice_new (GstAllocator);
gst_allocator_init (_my_allocator, 0, &info, free_allocator);
gst_allocator_register ("MyVidmem", gst_allocator_ref (_my_allocator));
gst_allocator_register ("MyVidmem", gst_object_ref (_my_allocator));
}
GstMemory *
my_vidmem_alloc (guint format, guint width, guint height)
{