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memory: use allocators to allocate memory

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Rename the GstMemoryImpl to GstMemoryAllocator because that's really what it is.
Add an alloc vmethod to the allocator members.
Improve registration of allocators.
Add methods to get and set the default allocator
Always use an allocator to allocate memory, use the default allocator when NULL
is passed.
Add user_data to the allocator Info so that we can pass extra info to the
allocator new method.
This commit is contained in:
Wim Taymans 2011-06-07 16:14:50 +02:00
parent b549abcf48
commit acb3ee9b2c
4 changed files with 200 additions and 106 deletions
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4
gst/gstbuffer.c
View file

@ -496,7 +496,7 @@ gst_buffer_new_and_alloc (guint size)
#if 1
if (size > 0) {
mem = gst_memory_new_alloc (size, _gst_buffer_data_alignment);
mem = gst_memory_allocator_alloc (NULL, size, _gst_buffer_data_alignment);
if (G_UNLIKELY (mem == NULL))
goto no_memory;
} else {
@ -1146,7 +1146,7 @@ _gst_buffer_arr_span (GstMemory ** mem[], gsize len[], guint n, gsize offset,
gsize count, left;
guint8 *dest, *ptr;
span = gst_memory_new_alloc (size, 0);
span = gst_memory_allocator_alloc (NULL, size, 0);
dest = gst_memory_map (span, NULL, NULL, GST_MAP_WRITE);
ptr = dest;

3
gst/gstbufferpool.c
View file

@ -167,7 +167,8 @@ default_alloc_buffer (GstBufferPool * pool, GstBuffer ** buffer,
align = priv->align - 1;
gst_buffer_take_memory (*buffer, gst_memory_new_alloc (priv->size, align));
gst_buffer_take_memory (*buffer, gst_memory_allocator_alloc (NULL, priv->size,
align));
return GST_FLOW_OK;
}

253
gst/gstmemory.c
View file

@ -27,9 +27,10 @@
* GstMemory is a lightweight refcounted object that wraps a region of memory.
* They are typically used to manage the data of a #GstBuffer.
*
* Memory is created by allocators.
*
* New memory can be created with gst_memory_new_wrapped() that wraps the memory
* allocated elsewhere and gst_memory_new_alloc() that creates a new GstMemory
* and the memory inside it.
* allocated elsewhere.
*
* Refcounting of the memory block is performed with gst_memory_ref() and
* gst_memory_unref().
@ -56,7 +57,7 @@
#include "gstmemory.h"
struct _GstMemoryImpl
struct _GstMemoryAllocator
{
GQuark name;
@ -75,8 +76,12 @@ typedef struct
gsize size;
} GstMemoryDefault;
static const GstMemoryImpl *_default_mem_impl;
static const GstMemoryImpl *_default_share_impl;
/* the default allocator */
static const GstMemoryAllocator *_default_allocator;
/* our predefined allocators */
static const GstMemoryAllocator *_default_mem_impl;
static const GstMemoryAllocator *_default_share_impl;
/* initialize the fields */
static void
@ -84,7 +89,7 @@ _default_mem_init (GstMemoryDefault * mem, GstMemoryFlags flags,
GstMemory * parent, gsize slice_size, gpointer data,
GFreeFunc free_func, gsize maxsize, gsize offset, gsize size)
{
mem->mem.impl = data ? _default_mem_impl : _default_share_impl;
mem->mem.allocator = data ? _default_mem_impl : _default_share_impl;
mem->mem.flags = flags;
mem->mem.refcount = 1;
mem->mem.parent = parent ? gst_memory_ref (parent) : NULL;
@ -141,6 +146,13 @@ _default_mem_new_block (gsize maxsize, gsize align, gsize offset, gsize size)
return mem;
}
static GstMemory *
_default_mem_alloc (const GstMemoryAllocator * allocator, gsize maxsize,
gsize align)
{
return (GstMemory *) _default_mem_new_block (maxsize, align, 0, maxsize);
}
static gsize
_default_mem_get_sizes (GstMemoryDefault * mem, gsize * maxsize)
{
@ -301,10 +313,14 @@ _fallback_is_span (GstMemory * mem1, GstMemory * mem2, gsize * offset)
return FALSE;
}
static GStaticRWLock lock = G_STATIC_RW_LOCK_INIT;
static GHashTable *memoryimpl;
void
_gst_memory_init (void)
{
static const GstMemoryInfo _mem_info = {
(GstMemoryAllocFunction) _default_mem_alloc,
(GstMemoryGetSizesFunction) _default_mem_get_sizes,
(GstMemoryResizeFunction) _default_mem_resize,
(GstMemoryMapFunction) _default_mem_map,
@ -312,9 +328,11 @@ _gst_memory_init (void)
(GstMemoryFreeFunction) _default_mem_free,
(GstMemoryCopyFunction) _default_mem_copy,
(GstMemoryShareFunction) _default_mem_share,
(GstMemoryIsSpanFunction) _default_mem_is_span
(GstMemoryIsSpanFunction) _default_mem_is_span,
NULL
};
static const GstMemoryInfo _share_info = {
(GstMemoryAllocFunction) _default_mem_alloc,
(GstMemoryGetSizesFunction) _default_mem_get_sizes,
(GstMemoryResizeFunction) _default_mem_resize,
(GstMemoryMapFunction) _default_share_map,
@ -322,57 +340,18 @@ _gst_memory_init (void)
(GstMemoryFreeFunction) _default_mem_free,
NULL,
NULL,
NULL,
NULL
};
_default_mem_impl = gst_memory_register ("GstMemoryDefault", &_mem_info);
memoryimpl = g_hash_table_new (g_str_hash, g_str_equal);
_default_mem_impl =
gst_memory_allocator_register ("GstMemoryDefault", &_mem_info);
_default_share_impl =
gst_memory_register ("GstMemorySharebuffer", &_share_info);
}
gst_memory_allocator_register ("GstMemorySharebuffer", &_share_info);
/**
* gst_memory_register:
* @name: the name of the implementation
* @info: #GstMemoryInfo
*
* Registers the memory implementation with @name and implementation functions
* @info.
*
* Returns: a new #GstMemoryImpl.
*/
const GstMemoryImpl *
gst_memory_register (const gchar * name, const GstMemoryInfo * info)
{
GstMemoryImpl *impl;
#define INSTALL_FALLBACK(_t) \
if (impl->info._t == NULL) impl->info._t = _fallback_ ##_t;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (info != NULL, NULL);
g_return_val_if_fail (info->get_sizes != NULL, NULL);
g_return_val_if_fail (info->resize != NULL, NULL);
g_return_val_if_fail (info->map != NULL, NULL);
g_return_val_if_fail (info->unmap != NULL, NULL);
g_return_val_if_fail (info->free != NULL, NULL);
impl = g_slice_new (GstMemoryImpl);
impl->name = g_quark_from_string (name);
impl->info = *info;
INSTALL_FALLBACK (copy);
INSTALL_FALLBACK (share);
INSTALL_FALLBACK (is_span);
GST_DEBUG ("register \"%s\" of size %" G_GSIZE_FORMAT, name);
#if 0
g_static_rw_lock_writer_lock (&lock);
g_hash_table_insert (memoryimpl, (gpointer) name, (gpointer) impl);
g_static_rw_lock_writer_unlock (&lock);
#endif
#undef INSTALL_FALLBACK
return impl;
_default_allocator = _default_mem_impl;
}
/**
@ -402,31 +381,6 @@ gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data,
return (GstMemory *) mem;
}
/**
* gst_memory_new_alloc:
* @maxsize: allocated size of @data
* @align: alignment for the data
*
* Allocate a new memory block with memory that is at least @maxsize big and has
* the given alignment.
*
* @align 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: a new #GstMemory.
*/
GstMemory *
gst_memory_new_alloc (gsize maxsize, gsize align)
{
GstMemoryDefault *mem;
g_return_val_if_fail (((align + 1) & align) == 0, NULL);
mem = _default_mem_new_block (maxsize, align, 0, maxsize);
return (GstMemory *) mem;
}
/**
* gst_memory_ref:
* @mem: a #GstMemory
@ -456,10 +410,10 @@ void
gst_memory_unref (GstMemory * mem)
{
g_return_if_fail (mem != NULL);
g_return_if_fail (mem->impl != NULL);
g_return_if_fail (mem->allocator != NULL);
if (g_atomic_int_dec_and_test (&mem->refcount))
mem->impl->info.free (mem);
mem->allocator->info.free (mem);
}
/**
@ -476,7 +430,7 @@ gst_memory_get_sizes (GstMemory * mem, gsize * maxsize)
{
g_return_val_if_fail (mem != NULL, 0);
return mem->impl->info.get_sizes (mem, maxsize);
return mem->allocator->info.get_sizes (mem, maxsize);
}
/**
@ -494,7 +448,7 @@ gst_memory_resize (GstMemory * mem, gsize offset, gsize size)
g_return_if_fail (mem != NULL);
g_return_if_fail (GST_MEMORY_IS_WRITABLE (mem));
mem->impl->info.resize (mem, offset, size);
mem->allocator->info.resize (mem, offset, size);
}
/**
@ -519,7 +473,7 @@ gst_memory_map (GstMemory * mem, gsize * size, gsize * maxsize,
g_return_val_if_fail (!(flags & GST_MAP_WRITE) ||
GST_MEMORY_IS_WRITABLE (mem), NULL);
return mem->impl->info.map (mem, size, maxsize, flags);
return mem->allocator->info.map (mem, size, maxsize, flags);
}
/**
@ -539,7 +493,7 @@ gst_memory_unmap (GstMemory * mem, gpointer data, gsize size)
{
g_return_val_if_fail (mem != NULL, FALSE);
return mem->impl->info.unmap (mem, data, size);
return mem->allocator->info.unmap (mem, data, size);
}
/**
@ -559,7 +513,7 @@ gst_memory_copy (GstMemory * mem, gsize offset, gsize size)
{
g_return_val_if_fail (mem != NULL, NULL);
return mem->impl->info.copy (mem, offset, size);
return mem->allocator->info.copy (mem, offset, size);
}
/**
@ -580,7 +534,7 @@ gst_memory_share (GstMemory * mem, gsize offset, gsize size)
{
g_return_val_if_fail (mem != NULL, NULL);
return mem->impl->info.share (mem, offset, size);
return mem->allocator->info.share (mem, offset, size);
}
/**
@ -604,8 +558,8 @@ gst_memory_is_span (GstMemory * mem1, GstMemory * mem2, gsize * offset)
g_return_val_if_fail (mem1 != NULL, FALSE);
g_return_val_if_fail (mem2 != NULL, FALSE);
/* need to have the same implementation */
if (mem1->impl != mem2->impl)
/* need to have the same allocators */
if (mem1->allocator != mem2->allocator)
return FALSE;
/* need to have the same parent */
@ -613,8 +567,129 @@ gst_memory_is_span (GstMemory * mem1, GstMemory * mem2, gsize * offset)
return FALSE;
/* and memory is contiguous */
if (!mem1->impl->info.is_span (mem1, mem2, offset))
if (!mem1->allocator->info.is_span (mem1, mem2, offset))
return FALSE;
return TRUE;
}
/**
* gst_memory_allocator_register:
* @name: the name of the allocator
* @info: #GstMemoryInfo
*
* Registers the memory allocator with @name and implementation functions
* @info.
*
* Returns: a new #GstMemoryAllocator.
*/
const GstMemoryAllocator *
gst_memory_allocator_register (const gchar * name, const GstMemoryInfo * info)
{
GstMemoryAllocator *allocator;
#define INSTALL_FALLBACK(_t) \
if (allocator->info._t == NULL) allocator->info._t = _fallback_ ##_t;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (info != NULL, NULL);
g_return_val_if_fail (info->get_sizes != NULL, NULL);
g_return_val_if_fail (info->resize != NULL, NULL);
g_return_val_if_fail (info->map != NULL, NULL);
g_return_val_if_fail (info->unmap != NULL, NULL);
g_return_val_if_fail (info->free != NULL, NULL);
allocator = g_slice_new (GstMemoryAllocator);
allocator->name = g_quark_from_string (name);
allocator->info = *info;
INSTALL_FALLBACK (copy);
INSTALL_FALLBACK (share);
INSTALL_FALLBACK (is_span);
#undef INSTALL_FALLBACK
GST_DEBUG ("register \"%s\" of size %" G_GSIZE_FORMAT, name);
g_static_rw_lock_writer_lock (&lock);
g_hash_table_insert (memoryimpl, (gpointer) name, (gpointer) allocator);
g_static_rw_lock_writer_unlock (&lock);
return allocator;
}
/**
* gst_memory_allocator_find:
* @name: the name of the allocator
*
* Find a previously registered allocator with @name.
*
* Returns: a #GstMemoryAllocator or NULL when the allocator with @name was not
* registered.
*/
const GstMemoryAllocator *
gst_memory_allocator_find (const gchar * name)
{
GstMemoryAllocator *allocator;
g_return_val_if_fail (name != NULL, NULL);
g_static_rw_lock_writer_lock (&lock);
allocator = g_hash_table_lookup (memoryimpl, (gconstpointer) name);
g_static_rw_lock_writer_unlock (&lock);
return allocator;
}
/**
* gst_memory_allocator_get_default:
*
* Get the default allocator.
*
* Returns: the default #GstMemoryAllocator
*/
const GstMemoryAllocator *
gst_memory_allocator_get_default (void)
{
return _default_allocator;
}
/**
* gst_memory_allocator_set_default:
* @allocator: a ##GstMemoryAllocator
*
* Set the default allocator.
*/
void
gst_memory_allocator_set_default (const GstMemoryAllocator * allocator)
{
g_return_if_fail (allocator != NULL);
_default_allocator = allocator;
}
/**
* gst_memory_allocator_alloc:
* @allocator: a #GstMemoryAllocator to use
* @maxsize: allocated size of @data
* @align: alignment for the data
*
* Use @allocator to allocate a new memory block with memory that is at least
* @maxsize big and has the given alignment.
*
* @align 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: a new #GstMemory.
*/
GstMemory *
gst_memory_allocator_alloc (const GstMemoryAllocator * allocator,
gsize maxsize, gsize align)
{
g_return_val_if_fail (allocator == NULL
|| allocator->info.alloc != NULL, NULL);
g_return_val_if_fail (((align + 1) & align) == 0, NULL);
if (allocator == NULL)
allocator = _default_allocator;
return allocator->info.alloc (allocator, maxsize, align);
}

42
gst/gstmemory.h
View file

@ -31,7 +31,7 @@ G_BEGIN_DECLS
typedef struct _GstMemory GstMemory;
typedef struct _GstMemoryInfo GstMemoryInfo;
typedef struct _GstMemoryImpl GstMemoryImpl;
typedef struct _GstMemoryAllocator GstMemoryAllocator;
/**
* GstMemoryFlags:
@ -62,7 +62,7 @@ typedef enum {
/**
* GstMemory:
* @impl: pointer to the #GstMemoryImpl
* @allocator: pointer to the #GstMemoryAllocator
* @flags: memory flags
* @refcount: refcount
* @parent: parent memory block
@ -71,7 +71,7 @@ typedef enum {
* as the first member of their structure.
*/
struct _GstMemory {
const GstMemoryImpl *impl;
const GstMemoryAllocator *allocator;
GstMemoryFlags flags;
gint refcount;
@ -104,6 +104,18 @@ typedef enum {
*/
#define GST_MEMORY_TRACE_NAME "GstMemory"
/**
* GstMemoryGetSizesFunction:
* @maxsize: the maxsize
* @align: the alignment
*
* Allocate a new #GstMemory that hold at least @maxsize bytes and is aligned to
* (@align + 1) bytes.
*
* Returns: a newly allocated #GstMemory. Free with gst_memory_unref()
*/
typedef GstMemory * (*GstMemoryAllocFunction) (const GstMemoryAllocator *allocator, gsize maxsize, gsize align);
/**
* GstMemoryGetSizesFunction:
* @mem: a #GstMemory
@ -214,6 +226,7 @@ typedef gboolean (*GstMemoryIsSpanFunction) (GstMemory *mem1, GstMemory *m
/**
* GstMemoryInfo:
* @alloc: the implementation of the GstMemoryAllocFunction
* @get_sizes: the implementation of the GstMemoryGetSizesFunction
* @resize: the implementation of the GstMemoryResizeFunction
* @map: the implementation of the GstMemoryMapFunction
@ -222,11 +235,13 @@ typedef gboolean (*GstMemoryIsSpanFunction) (GstMemory *mem1, GstMemory *m
* @copy: the implementation of the GstMemoryCopyFunction
* @share: the implementation of the GstMemoryShareFunction
* @is_span: the implementation of the GstMemoryIsSpanFunction
* @user_data: generic user data for the allocator
*
* The #GstMemoryInfo is used to register new memory implementations and contain
* The #GstMemoryInfo is used to register new memory allocators and contain
* the implementations for various memory operations.
*/
struct _GstMemoryInfo {
GstMemoryAllocFunction alloc;
GstMemoryGetSizesFunction get_sizes;
GstMemoryResizeFunction resize;
GstMemoryMapFunction map;
@ -236,14 +251,24 @@ struct _GstMemoryInfo {
GstMemoryCopyFunction copy;
GstMemoryShareFunction share;
GstMemoryIsSpanFunction is_span;
gpointer user_data;
};
void _gst_memory_init (void);
/* allocators */
const GstMemoryAllocator * gst_memory_allocator_register (const gchar *name, const GstMemoryInfo *info);
const GstMemoryAllocator * gst_memory_allocator_find (const gchar *name);
const GstMemoryAllocator * gst_memory_allocator_get_default (void);
void gst_memory_allocator_set_default (const GstMemoryAllocator * allocator);
/* allocating memory blocks */
GstMemory * gst_memory_allocator_alloc (const GstMemoryAllocator * allocator,
gsize maxsize, gsize align);
GstMemory * gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data, GFreeFunc free_func,
gsize maxsize, gsize offset, gsize size);
GstMemory * gst_memory_new_alloc (gsize maxsize, gsize align);
/* refcounting */
GstMemory * gst_memory_ref (GstMemory *mem);
@ -268,13 +293,6 @@ gboolean gst_memory_is_span (GstMemory *mem1, GstMemory *mem2, gsize *offs
GstMemory * gst_memory_span (GstMemory **mem1, gsize len1, gsize offset,
GstMemory **mem2, gsize len2, gsize size);
const GstMemoryImpl * gst_memory_register (const gchar *name, const GstMemoryInfo *info);
#if 0
const GstMemoryInfo * gst_memory_get_info (const gchar * impl);
#endif
G_END_DECLS
#endif /* __GST_MEMORY_H__ */