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Move the locking methods from GstMemory to GstMiniObject. Add a miniobject flag to enable LOCKABLE objects. LOCKABLE objects can use the lock/unlock API to control the access to the object. Add a minobject flag that allows you to lock an object in readonly mode. Modify the _is_writable() method to check the shared counter for LOCKABLE objects. This allows us to control writability separately from the refcount for LOCKABLE objects.
945 lines
25 KiB
C
945 lines
25 KiB
C
/* GStreamer
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* Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.be>
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*
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* gstmemory.c: memory block handling
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstmemory
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* @short_description: refcounted wrapper for memory blocks
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* @see_also: #GstBuffer
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*
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* GstMemory is a lightweight refcounted object that wraps a region of memory.
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* They are typically used to manage the data of a #GstBuffer.
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*
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* A GstMemory object has an allocated region of memory of maxsize. The maximum
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* size does not change during the lifetime of the memory object. The memory
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* also has an offset and size property that specifies the valid range of memory
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* in the allocated region.
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*
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* Memory is usually created by allocators with a gst_allocator_alloc()
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* method call. When NULL is used as the allocator, the default allocator will
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* be used.
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*
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* New allocators can be registered with gst_allocator_register().
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* Allocators are identified by name and can be retrieved with
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* gst_allocator_find(). gst_allocator_set_default() can be used to change the
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* default allocator.
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*
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* New memory can be created with gst_memory_new_wrapped() that wraps the memory
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* allocated elsewhere.
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*
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* Refcounting of the memory block is performed with gst_memory_ref() and
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* gst_memory_unref().
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*
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* The size of the memory can be retrieved and changed with
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* gst_memory_get_sizes() and gst_memory_resize() respectively.
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*
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* Getting access to the data of the memory is performed with gst_memory_map().
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* The call will return a pointer to offset bytes into the region of memory.
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* After the memory access is completed, gst_memory_unmap() should be called.
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*
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* Memory can be copied with gst_memory_copy(), which will return a writable
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* copy. gst_memory_share() will create a new memory block that shares the
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* memory with an existing memory block at a custom offset and with a custom
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* size.
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*
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* Memory can be efficiently merged when gst_memory_is_span() returns TRUE.
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*
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* Last reviewed on 2012-03-28 (0.11.3)
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gst_private.h"
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#include "gstmemory.h"
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GST_DEFINE_MINI_OBJECT_TYPE (GstMemory, gst_memory);
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GST_DEFINE_MINI_OBJECT_TYPE (GstAllocator, gst_allocator);
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G_DEFINE_BOXED_TYPE (GstAllocationParams, gst_allocation_params,
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(GBoxedCopyFunc) gst_allocation_params_copy,
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(GBoxedFreeFunc) gst_allocation_params_free);
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#if defined(MEMORY_ALIGNMENT_MALLOC)
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size_t gst_memory_alignment = 7;
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#elif defined(MEMORY_ALIGNMENT_PAGESIZE)
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/* we fill this in in the _init method */
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size_t gst_memory_alignment = 0;
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#elif defined(MEMORY_ALIGNMENT)
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size_t gst_memory_alignment = MEMORY_ALIGNMENT - 1;
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#else
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#error "No memory alignment configured"
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size_t gst_memory_alignment = 0;
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#endif
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struct _GstAllocator
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{
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GstMiniObject mini_object;
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GstMemoryInfo info;
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gpointer user_data;
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GDestroyNotify notify;
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};
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/* default memory implementation */
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typedef struct
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{
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GstMemory mem;
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gsize slice_size;
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guint8 *data;
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gpointer user_data;
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GDestroyNotify notify;
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} GstMemoryDefault;
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/* the default allocator */
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static GstAllocator *_default_allocator;
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/* our predefined allocators */
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static GstAllocator *_default_mem_impl;
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#define SHARE_ONE (1 << 16)
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#define SHARE_MASK (~(SHARE_ONE - 1))
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#define LOCK_ONE (GST_LOCK_FLAG_LAST)
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#define FLAG_MASK (GST_LOCK_FLAG_LAST - 1)
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#define LOCK_MASK ((SHARE_ONE - 1) - FLAG_MASK)
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#define LOCK_FLAG_MASK (SHARE_ONE - 1)
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static GstMemory *
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_gst_memory_copy (GstMemory * mem)
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{
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return gst_memory_copy (mem, 0, -1);
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}
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static void
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_gst_memory_free (GstMemory * mem)
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{
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mem->allocator->info.mem_free (mem);
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}
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/* initialize the fields */
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static void
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_default_mem_init (GstMemoryDefault * mem, GstMemoryFlags flags,
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GstMemory * parent, gsize slice_size, gpointer data,
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gsize maxsize, gsize offset, gsize size, gsize align,
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gpointer user_data, GDestroyNotify notify)
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{
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gst_mini_object_init (GST_MINI_OBJECT_CAST (mem),
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flags | GST_MINI_OBJECT_FLAG_LOCKABLE, GST_TYPE_MEMORY,
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(GstMiniObjectCopyFunction) _gst_memory_copy, NULL,
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(GstMiniObjectFreeFunction) _gst_memory_free);
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mem->mem.allocator = _default_mem_impl;
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mem->mem.parent = parent ? gst_memory_ref (parent) : NULL;
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mem->mem.maxsize = maxsize;
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mem->mem.align = align;
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mem->mem.offset = offset;
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mem->mem.size = size;
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mem->slice_size = slice_size;
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mem->data = data;
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mem->user_data = user_data;
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mem->notify = notify;
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GST_CAT_DEBUG (GST_CAT_MEMORY, "new memory %p, maxsize:%" G_GSIZE_FORMAT
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" offset:%" G_GSIZE_FORMAT " size:%" G_GSIZE_FORMAT, mem, maxsize,
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offset, size);
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}
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/* create a new memory block that manages the given memory */
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static GstMemoryDefault *
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_default_mem_new (GstMemoryFlags flags, GstMemory * parent, gpointer data,
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gsize maxsize, gsize offset, gsize size, gsize align, gpointer user_data,
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GDestroyNotify notify)
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{
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GstMemoryDefault *mem;
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gsize slice_size;
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slice_size = sizeof (GstMemoryDefault);
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mem = g_slice_alloc (slice_size);
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_default_mem_init (mem, flags, parent, slice_size,
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data, maxsize, offset, size, align, user_data, notify);
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return mem;
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}
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/* allocate the memory and structure in one block */
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static GstMemoryDefault *
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_default_mem_new_block (GstMemoryFlags flags, gsize maxsize, gsize align,
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gsize offset, gsize size)
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{
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GstMemoryDefault *mem;
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gsize aoffset, slice_size, padding;
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guint8 *data;
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/* ensure configured alignment */
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align |= gst_memory_alignment;
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/* allocate more to compensate for alignment */
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maxsize += align;
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/* alloc header and data in one block */
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slice_size = sizeof (GstMemoryDefault) + maxsize;
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mem = g_slice_alloc (slice_size);
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if (mem == NULL)
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return NULL;
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data = (guint8 *) mem + sizeof (GstMemoryDefault);
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/* do alignment */
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if ((aoffset = ((guintptr) data & align))) {
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aoffset = (align + 1) - aoffset;
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data += aoffset;
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maxsize -= aoffset;
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}
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if (offset && (flags & GST_MEMORY_FLAG_ZERO_PREFIXED))
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memset (data, 0, offset);
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padding = maxsize - (offset + size);
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if (padding && (flags & GST_MEMORY_FLAG_ZERO_PADDED))
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memset (data + offset + size, 0, padding);
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_default_mem_init (mem, flags, NULL, slice_size, data, maxsize,
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offset, size, align, NULL, NULL);
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return mem;
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}
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static GstMemory *
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_default_alloc_alloc (GstAllocator * allocator, gsize size,
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GstAllocationParams * params, gpointer user_data)
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{
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gsize maxsize = size + params->prefix + params->padding;
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return (GstMemory *) _default_mem_new_block (params->flags,
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maxsize, params->align, params->prefix, size);
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}
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static gpointer
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_default_mem_map (GstMemoryDefault * mem, gsize maxsize, GstMapFlags flags)
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{
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return mem->data;
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}
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static gboolean
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_default_mem_unmap (GstMemoryDefault * mem)
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{
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return TRUE;
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}
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static void
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_default_mem_free (GstMemoryDefault * mem)
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{
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GST_CAT_DEBUG (GST_CAT_MEMORY, "free memory %p", mem);
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if (mem->mem.parent)
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gst_memory_unref (mem->mem.parent);
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if (mem->notify)
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mem->notify (mem->user_data);
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g_slice_free1 (mem->slice_size, mem);
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}
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static GstMemoryDefault *
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_default_mem_copy (GstMemoryDefault * mem, gssize offset, gsize size)
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{
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GstMemoryDefault *copy;
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if (size == -1)
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size = mem->mem.size > offset ? mem->mem.size - offset : 0;
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copy =
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_default_mem_new_block (0, mem->mem.maxsize, 0, mem->mem.offset + offset,
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size);
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GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
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"memcpy %" G_GSIZE_FORMAT " memory %p -> %p", mem->mem.maxsize, mem,
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copy);
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memcpy (copy->data, mem->data, mem->mem.maxsize);
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return copy;
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}
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static GstMemoryDefault *
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_default_mem_share (GstMemoryDefault * mem, gssize offset, gsize size)
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{
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GstMemoryDefault *sub;
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GstMemory *parent;
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/* find the real parent */
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if ((parent = mem->mem.parent) == NULL)
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parent = (GstMemory *) mem;
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if (size == -1)
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size = mem->mem.size - offset;
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sub =
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_default_mem_new (GST_MINI_OBJECT_FLAGS (parent), parent, mem->data,
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mem->mem.maxsize, mem->mem.offset + offset, size, mem->mem.align, NULL,
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NULL);
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return sub;
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}
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static gboolean
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_default_mem_is_span (GstMemoryDefault * mem1, GstMemoryDefault * mem2,
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gsize * offset)
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{
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if (offset) {
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GstMemoryDefault *parent;
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parent = (GstMemoryDefault *) mem1->mem.parent;
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*offset = mem1->mem.offset - parent->mem.offset;
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}
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/* and memory is contiguous */
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return mem1->data + mem1->mem.offset + mem1->mem.size ==
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mem2->data + mem2->mem.offset;
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}
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static GstMemory *
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_fallback_mem_copy (GstMemory * mem, gssize offset, gssize size)
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{
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GstMemory *copy;
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GstMapInfo sinfo, dinfo;
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GstAllocationParams params = { 0, 0, 0, mem->align, };
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if (!gst_memory_map (mem, &sinfo, GST_MAP_READ))
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return NULL;
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if (size == -1)
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size = sinfo.size > offset ? sinfo.size - offset : 0;
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/* use the same allocator as the memory we copy */
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copy = gst_allocator_alloc (mem->allocator, size, ¶ms);
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if (!gst_memory_map (copy, &dinfo, GST_MAP_WRITE)) {
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GST_CAT_WARNING (GST_CAT_MEMORY, "could not write map memory %p", copy);
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gst_memory_unmap (mem, &sinfo);
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return NULL;
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}
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GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
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"memcpy %" G_GSSIZE_FORMAT " memory %p -> %p", size, mem, copy);
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memcpy (dinfo.data, sinfo.data + offset, size);
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gst_memory_unmap (copy, &dinfo);
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gst_memory_unmap (mem, &sinfo);
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return copy;
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}
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static gboolean
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_fallback_mem_is_span (GstMemory * mem1, GstMemory * mem2, gsize * offset)
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{
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return FALSE;
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}
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static GRWLock lock;
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static GHashTable *allocators;
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static void
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_priv_sysmem_notify (gpointer user_data)
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{
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g_warning ("The default memory allocator was freed!");
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}
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void
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_priv_gst_memory_initialize (void)
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{
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static const GstMemoryInfo _mem_info = {
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GST_ALLOCATOR_SYSMEM,
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(GstAllocatorAllocFunction) _default_alloc_alloc,
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(GstMemoryMapFunction) _default_mem_map,
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(GstMemoryUnmapFunction) _default_mem_unmap,
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(GstMemoryFreeFunction) _default_mem_free,
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(GstMemoryCopyFunction) _default_mem_copy,
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(GstMemoryShareFunction) _default_mem_share,
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(GstMemoryIsSpanFunction) _default_mem_is_span,
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};
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g_rw_lock_init (&lock);
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allocators = g_hash_table_new (g_str_hash, g_str_equal);
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#ifdef HAVE_GETPAGESIZE
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#ifdef MEMORY_ALIGNMENT_PAGESIZE
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gst_memory_alignment = getpagesize () - 1;
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#endif
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#endif
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GST_CAT_DEBUG (GST_CAT_MEMORY, "memory alignment: %" G_GSIZE_FORMAT,
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gst_memory_alignment);
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_default_mem_impl = gst_allocator_new (&_mem_info, NULL, _priv_sysmem_notify);
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_default_allocator = gst_allocator_ref (_default_mem_impl);
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gst_allocator_register (GST_ALLOCATOR_SYSMEM,
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gst_allocator_ref (_default_mem_impl));
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}
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/**
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* gst_memory_new_wrapped:
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* @flags: #GstMemoryFlags
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* @data: data to wrap
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* @maxsize: allocated size of @data
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* @offset: offset in @data
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* @size: size of valid data
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* @user_data: user_data
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* @notify: called with @user_data when the memory is freed
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*
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* Allocate a new memory block that wraps the given @data.
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*
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* The prefix/padding must be filled with 0 if @flags contains
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* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED respectively.
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*
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* Returns: a new #GstMemory.
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*/
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GstMemory *
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gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data,
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gsize maxsize, gsize offset, gsize size, gpointer user_data,
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GDestroyNotify notify)
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{
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GstMemoryDefault *mem;
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g_return_val_if_fail (data != NULL, NULL);
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g_return_val_if_fail (offset + size <= maxsize, NULL);
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mem =
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_default_mem_new (flags, NULL, data, maxsize, offset, size, 0, user_data,
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notify);
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return (GstMemory *) mem;
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}
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/**
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* gst_memory_get_sizes:
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* @mem: a #GstMemory
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* @offset: pointer to offset
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* @maxsize: pointer to maxsize
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*
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* Get the current @size, @offset and @maxsize of @mem.
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*
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* Returns: the current sizes of @mem
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*/
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gsize
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gst_memory_get_sizes (GstMemory * mem, gsize * offset, gsize * maxsize)
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{
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g_return_val_if_fail (mem != NULL, 0);
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if (offset)
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*offset = mem->offset;
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if (maxsize)
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*maxsize = mem->maxsize;
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return mem->size;
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}
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/**
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* gst_memory_resize:
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* @mem: a #GstMemory
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* @offset: a new offset
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* @size: a new size
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*
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* Resize the memory region. @mem should be writable and offset + size should be
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* less than the maxsize of @mem.
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*
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* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED will be
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* cleared when offset or padding is increased respectively.
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*/
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void
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gst_memory_resize (GstMemory * mem, gssize offset, gsize size)
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{
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g_return_if_fail (mem != NULL);
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g_return_if_fail (offset >= 0 || mem->offset >= -offset);
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g_return_if_fail (size + mem->offset + offset <= mem->maxsize);
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/* if we increase the prefix, we can't guarantee it is still 0 filled */
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if ((offset > 0) && GST_MEMORY_IS_ZERO_PREFIXED (mem))
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GST_MEMORY_FLAG_UNSET (mem, GST_MEMORY_FLAG_ZERO_PREFIXED);
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/* if we increase the padding, we can't guarantee it is still 0 filled */
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if ((offset + size < mem->size) && GST_MEMORY_IS_ZERO_PADDED (mem))
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GST_MEMORY_FLAG_UNSET (mem, GST_MEMORY_FLAG_ZERO_PADDED);
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mem->offset += offset;
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mem->size = size;
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}
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/**
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* gst_memory_make_mapped:
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* @mem: (transfer full): a #GstMemory
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* @info: (out): pointer for info
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* @flags: mapping flags
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*
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* Create a #GstMemory object that is mapped with @flags. If @mem is mappable
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* with @flags, this function returns the mapped @mem directly. Otherwise a
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* mapped copy of @mem is returned.
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*
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* This function takes ownership of old @mem and returns a reference to a new
|
|
* #GstMemory.
|
|
*
|
|
* Returns: (transfer full): a #GstMemory object mapped with @flags or NULL when
|
|
* a mapping is not possible.
|
|
*/
|
|
GstMemory *
|
|
gst_memory_make_mapped (GstMemory * mem, GstMapInfo * info, GstMapFlags flags)
|
|
{
|
|
GstMemory *result;
|
|
|
|
if (gst_memory_map (mem, info, flags)) {
|
|
result = mem;
|
|
} else {
|
|
result = gst_memory_copy (mem, 0, -1);
|
|
gst_memory_unref (mem);
|
|
|
|
if (result == NULL)
|
|
goto cannot_copy;
|
|
|
|
if (!gst_memory_map (result, info, flags))
|
|
goto cannot_map;
|
|
}
|
|
return result;
|
|
|
|
/* ERRORS */
|
|
cannot_copy:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_MEMORY, "cannot copy memory %p", mem);
|
|
return NULL;
|
|
}
|
|
cannot_map:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_MEMORY, "cannot map memory %p with flags %d", mem,
|
|
flags);
|
|
gst_memory_unref (result);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_memory_map:
|
|
* @mem: a #GstMemory
|
|
* @info: (out): pointer for info
|
|
* @flags: mapping flags
|
|
*
|
|
* Fill @info with the pointer and sizes of the memory in @mem that can be
|
|
* accessed according to @flags.
|
|
*
|
|
* This function can return %FALSE for various reasons:
|
|
* - the memory backed by @mem is not accessible with the given @flags.
|
|
* - the memory was already mapped with a different mapping.
|
|
*
|
|
* @info and its contents remain valid for as long as @mem is valid and
|
|
* until gst_memory_unmap() is called.
|
|
*
|
|
* For each gst_memory_map() call, a corresponding gst_memory_unmap() call
|
|
* should be done.
|
|
*
|
|
* Returns: %TRUE if the map operation was successful.
|
|
*/
|
|
gboolean
|
|
gst_memory_map (GstMemory * mem, GstMapInfo * info, GstMapFlags flags)
|
|
{
|
|
g_return_val_if_fail (mem != NULL, FALSE);
|
|
g_return_val_if_fail (info != NULL, FALSE);
|
|
|
|
if (!gst_memory_lock (mem, flags))
|
|
goto lock_failed;
|
|
|
|
info->data = mem->allocator->info.mem_map (mem, mem->maxsize, flags);
|
|
|
|
if (G_UNLIKELY (info->data == NULL))
|
|
goto error;
|
|
|
|
info->memory = mem;
|
|
info->flags = flags;
|
|
info->size = mem->size;
|
|
info->maxsize = mem->maxsize - mem->offset;
|
|
info->data = info->data + mem->offset;
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
lock_failed:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_MEMORY, "mem %p: lock %d failed", mem, flags);
|
|
return FALSE;
|
|
}
|
|
error:
|
|
{
|
|
/* something went wrong, restore the orginal state again */
|
|
GST_CAT_ERROR (GST_CAT_MEMORY, "mem %p: map failed", mem);
|
|
gst_memory_unlock (mem, flags);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_memory_unmap:
|
|
* @mem: a #GstMemory
|
|
* @info: a #GstMapInfo
|
|
*
|
|
* Release the memory obtained with gst_memory_map()
|
|
*/
|
|
void
|
|
gst_memory_unmap (GstMemory * mem, GstMapInfo * info)
|
|
{
|
|
g_return_if_fail (mem != NULL);
|
|
g_return_if_fail (info != NULL);
|
|
g_return_if_fail (info->memory == mem);
|
|
|
|
mem->allocator->info.mem_unmap (mem);
|
|
gst_memory_unlock (mem, info->flags);
|
|
}
|
|
|
|
/**
|
|
* gst_memory_copy:
|
|
* @mem: a #GstMemory
|
|
* @offset: an offset to copy
|
|
* @size: size to copy or -1 to copy all bytes from offset
|
|
*
|
|
* Return a copy of @size bytes from @mem starting from @offset. This copy is
|
|
* guaranteed to be writable. @size can be set to -1 to return a copy all bytes
|
|
* from @offset.
|
|
*
|
|
* Returns: a new #GstMemory.
|
|
*/
|
|
GstMemory *
|
|
gst_memory_copy (GstMemory * mem, gssize offset, gssize size)
|
|
{
|
|
GstMemory *copy;
|
|
|
|
g_return_val_if_fail (mem != NULL, NULL);
|
|
|
|
copy = mem->allocator->info.mem_copy (mem, offset, size);
|
|
|
|
return copy;
|
|
}
|
|
|
|
/**
|
|
* gst_memory_share:
|
|
* @mem: a #GstMemory
|
|
* @offset: an offset to share
|
|
* @size: size to share or -1 to share bytes from offset
|
|
*
|
|
* Return a shared copy of @size bytes from @mem starting from @offset. No
|
|
* memory copy is performed and the memory region is simply shared. The result
|
|
* is guaranteed to be not-writable. @size can be set to -1 to return a share
|
|
* all bytes from @offset.
|
|
*
|
|
* Returns: a new #GstMemory.
|
|
*/
|
|
GstMemory *
|
|
gst_memory_share (GstMemory * mem, gssize offset, gssize size)
|
|
{
|
|
GstMemory *shared;
|
|
|
|
g_return_val_if_fail (mem != NULL, NULL);
|
|
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);
|
|
|
|
return shared;
|
|
}
|
|
|
|
/**
|
|
* gst_memory_is_span:
|
|
* @mem1: a #GstMemory
|
|
* @mem2: a #GstMemory
|
|
* @offset: a pointer to a result offset
|
|
*
|
|
* Check if @mem1 and mem2 share the memory with a common parent memory object
|
|
* and that the memory is contiguous.
|
|
*
|
|
* If this is the case, the memory of @mem1 and @mem2 can be merged
|
|
* efficiently by performing gst_memory_share() on the parent object from
|
|
* the returned @offset.
|
|
*
|
|
* Returns: %TRUE if the memory is contiguous and of a common parent.
|
|
*/
|
|
gboolean
|
|
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 allocators */
|
|
if (mem1->allocator != mem2->allocator)
|
|
return FALSE;
|
|
|
|
/* need to have the same parent */
|
|
if (mem1->parent == NULL || mem1->parent != mem2->parent)
|
|
return FALSE;
|
|
|
|
/* and memory is contiguous */
|
|
if (!mem1->allocator->info.mem_is_span (mem1, mem2, offset))
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
_gst_allocator_free (GstAllocator * allocator)
|
|
{
|
|
if (allocator->notify)
|
|
allocator->notify (allocator->user_data);
|
|
|
|
g_slice_free1 (sizeof (GstAllocator), allocator);
|
|
}
|
|
|
|
static GstAllocator *
|
|
_gst_allocator_copy (GstAllocator * allocator)
|
|
{
|
|
return gst_allocator_ref (allocator);
|
|
}
|
|
|
|
/**
|
|
* gst_allocator_new:
|
|
* @info: a #GstMemoryInfo
|
|
* @user_data: user data
|
|
* @notify: a #GDestroyNotify for @user_data
|
|
*
|
|
* Create a new memory allocator with @info and @user_data.
|
|
*
|
|
* All functions in @info are mandatory exept the copy and is_span
|
|
* functions, which will have a default implementation when left NULL.
|
|
*
|
|
* The @user_data will be passed to all calls of the alloc function. @notify
|
|
* will be called with @user_data when the allocator is freed.
|
|
*
|
|
* Returns: a new #GstAllocator.
|
|
*/
|
|
GstAllocator *
|
|
gst_allocator_new (const GstMemoryInfo * info, gpointer user_data,
|
|
GDestroyNotify notify)
|
|
{
|
|
GstAllocator *allocator;
|
|
|
|
g_return_val_if_fail (info != NULL, NULL);
|
|
g_return_val_if_fail (info->alloc != NULL, NULL);
|
|
g_return_val_if_fail (info->mem_map != NULL, NULL);
|
|
g_return_val_if_fail (info->mem_unmap != NULL, NULL);
|
|
g_return_val_if_fail (info->mem_free != NULL, NULL);
|
|
g_return_val_if_fail (info->mem_share != NULL, NULL);
|
|
|
|
allocator = g_slice_new0 (GstAllocator);
|
|
|
|
gst_mini_object_init (GST_MINI_OBJECT_CAST (allocator), 0, GST_TYPE_ALLOCATOR,
|
|
(GstMiniObjectCopyFunction) _gst_allocator_copy, NULL,
|
|
(GstMiniObjectFreeFunction) _gst_allocator_free);
|
|
|
|
allocator->info = *info;
|
|
allocator->user_data = user_data;
|
|
allocator->notify = notify;
|
|
|
|
#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, "new allocator %p", allocator);
|
|
|
|
return allocator;
|
|
}
|
|
|
|
/**
|
|
* gst_allocator_get_memory_type:
|
|
* @allocator: a #GstAllocator
|
|
*
|
|
* Get the memory type allocated by this allocator
|
|
*
|
|
* Returns: the memory type provided by @allocator
|
|
*/
|
|
const gchar *
|
|
gst_allocator_get_memory_type (GstAllocator * allocator)
|
|
{
|
|
g_return_val_if_fail (allocator != NULL, NULL);
|
|
|
|
return allocator->info.mem_type;
|
|
}
|
|
|
|
/**
|
|
* 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, allocator->user_data);
|
|
|
|
return mem;
|
|
}
|