mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-10-02 08:42:32 +00:00
This is mostly on nullable return values, and some other minor ones that I ran across. https://bugzilla.gnome.org/show_bug.cgi?id=789319
651 lines
17 KiB
C
651 lines
17 KiB
C
/* GStreamer
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* Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.be>
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*
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* gstallocator.c: memory block allocator
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstallocator
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* @title: GstAllocator
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* @short_description: allocate memory blocks
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* @see_also: #GstMemory
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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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#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_DEBUG_CATEGORY_STATIC (gst_allocator_debug);
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#define GST_CAT_DEFAULT gst_allocator_debug
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#define GST_ALLOCATOR_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_ALLOCATOR, GstAllocatorPrivate))
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struct _GstAllocatorPrivate
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{
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gpointer dummy;
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};
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#if defined(MEMORY_ALIGNMENT_MALLOC)
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gsize 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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gsize gst_memory_alignment = 0;
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#elif defined(MEMORY_ALIGNMENT)
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gsize gst_memory_alignment = MEMORY_ALIGNMENT - 1;
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#else
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#error "No memory alignment configured"
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gsize gst_memory_alignment = 0;
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#endif
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/* the default allocator */
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static GstAllocator *_default_allocator;
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static GstAllocator *_sysmem_allocator;
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/* registered allocators */
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static GRWLock lock;
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static GHashTable *allocators;
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G_DEFINE_ABSTRACT_TYPE (GstAllocator, gst_allocator, GST_TYPE_OBJECT);
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static void
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gst_allocator_class_init (GstAllocatorClass * klass)
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{
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g_type_class_add_private (klass, sizeof (GstAllocatorPrivate));
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GST_DEBUG_CATEGORY_INIT (gst_allocator_debug, "allocator", 0,
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"allocator debug");
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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, mem->align, 0, 0, };
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GstAllocator *allocator;
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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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allocator = mem->allocator;
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if (GST_OBJECT_FLAG_IS_SET (allocator, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC))
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allocator = NULL;
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copy = gst_allocator_alloc (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_allocator_free (mem->allocator, 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 void
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gst_allocator_init (GstAllocator * allocator)
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{
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allocator->priv = GST_ALLOCATOR_GET_PRIVATE (allocator);
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allocator->mem_copy = _fallback_mem_copy;
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allocator->mem_is_span = _fallback_mem_is_span;
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}
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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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/**
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* gst_allocation_params_init:
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* @params: a #GstAllocationParams
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*
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* Initialize @params to its default values
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*/
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void
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gst_allocation_params_init (GstAllocationParams * params)
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{
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g_return_if_fail (params != NULL);
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memset (params, 0, sizeof (GstAllocationParams));
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}
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/**
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* gst_allocation_params_copy:
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* @params: (transfer none) (nullable): a #GstAllocationParams
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*
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* Create a copy of @params.
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*
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* Free-function: gst_allocation_params_free
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*
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* Returns: (transfer full) (nullable): a new ##GstAllocationParams, free with
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* gst_allocation_params_free().
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*/
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GstAllocationParams *
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gst_allocation_params_copy (const GstAllocationParams * params)
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{
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GstAllocationParams *result = NULL;
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if (params) {
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result =
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(GstAllocationParams *) g_slice_copy (sizeof (GstAllocationParams),
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params);
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}
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return result;
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}
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/**
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* gst_allocation_params_free:
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* @params: (in) (transfer full): a #GstAllocationParams
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*
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* Free @params
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*/
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void
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gst_allocation_params_free (GstAllocationParams * params)
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{
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g_slice_free (GstAllocationParams, params);
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}
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/**
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* gst_allocator_register:
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* @name: the name of the allocator
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* @allocator: (transfer full): #GstAllocator
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*
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* Registers the memory @allocator with @name. This function takes ownership of
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* @allocator.
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*/
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void
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gst_allocator_register (const gchar * name, GstAllocator * allocator)
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{
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g_return_if_fail (name != NULL);
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g_return_if_fail (allocator != NULL);
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GST_CAT_DEBUG (GST_CAT_MEMORY, "registering allocator %p with name \"%s\"",
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allocator, name);
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g_rw_lock_writer_lock (&lock);
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/* The ref will never be released */
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GST_OBJECT_FLAG_SET (allocator, GST_OBJECT_FLAG_MAY_BE_LEAKED);
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g_hash_table_insert (allocators, (gpointer) name, (gpointer) allocator);
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g_rw_lock_writer_unlock (&lock);
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}
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/**
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* gst_allocator_find:
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* @name: (allow-none): the name of the allocator
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*
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* Find a previously registered allocator with @name. When @name is %NULL, the
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* default allocator will be returned.
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*
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* Returns: (transfer full) (nullable): a #GstAllocator or %NULL when
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* the allocator with @name was not registered. Use gst_object_unref()
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* to release the allocator after usage.
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*/
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GstAllocator *
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gst_allocator_find (const gchar * name)
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{
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GstAllocator *allocator;
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g_rw_lock_reader_lock (&lock);
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if (name) {
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allocator = g_hash_table_lookup (allocators, (gconstpointer) name);
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} else {
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allocator = _default_allocator;
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}
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if (allocator)
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gst_object_ref (allocator);
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g_rw_lock_reader_unlock (&lock);
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return allocator;
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}
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/**
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* gst_allocator_set_default:
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* @allocator: (transfer full): a #GstAllocator
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*
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* Set the default allocator. This function takes ownership of @allocator.
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*/
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void
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gst_allocator_set_default (GstAllocator * allocator)
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{
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GstAllocator *old;
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g_return_if_fail (GST_IS_ALLOCATOR (allocator));
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g_rw_lock_writer_lock (&lock);
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old = _default_allocator;
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_default_allocator = allocator;
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g_rw_lock_writer_unlock (&lock);
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if (old)
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gst_object_unref (old);
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}
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/**
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* gst_allocator_alloc:
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* @allocator: (transfer none) (allow-none): a #GstAllocator to use
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* @size: size of the visible memory area
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* @params: (transfer none) (allow-none): optional parameters
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*
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* Use @allocator to allocate a new memory block with memory that is at least
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* @size big.
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*
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* The optional @params can specify the prefix and padding for the memory. If
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* %NULL is passed, no flags, no extra prefix/padding and a default alignment is
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* used.
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*
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* The prefix/padding will 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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* When @allocator is %NULL, the default allocator will be used.
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*
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* The alignment in @params is given as a bitmask so that @align + 1 equals
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* the amount of bytes to align to. For example, to align to 8 bytes,
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* use an alignment of 7.
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*
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* Returns: (transfer full) (nullable): a new #GstMemory.
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*/
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GstMemory *
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gst_allocator_alloc (GstAllocator * allocator, gsize size,
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GstAllocationParams * params)
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{
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GstMemory *mem;
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static GstAllocationParams defparams = { 0, 0, 0, 0, };
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GstAllocatorClass *aclass;
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if (params) {
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g_return_val_if_fail (((params->align + 1) & params->align) == 0, NULL);
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} else {
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params = &defparams;
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}
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if (allocator == NULL)
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allocator = _default_allocator;
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aclass = GST_ALLOCATOR_GET_CLASS (allocator);
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if (aclass->alloc)
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mem = aclass->alloc (allocator, size, params);
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else
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mem = NULL;
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return mem;
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}
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/**
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* gst_allocator_free:
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* @allocator: (transfer none): a #GstAllocator to use
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* @memory: (transfer full): the memory to free
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*
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* Free @memory that was previously allocated with gst_allocator_alloc().
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*/
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void
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gst_allocator_free (GstAllocator * allocator, GstMemory * memory)
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{
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GstAllocatorClass *aclass;
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g_return_if_fail (GST_IS_ALLOCATOR (allocator));
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g_return_if_fail (memory != NULL);
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g_return_if_fail (memory->allocator == allocator);
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aclass = GST_ALLOCATOR_GET_CLASS (allocator);
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if (aclass->free)
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aclass->free (allocator, memory);
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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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} GstMemorySystem;
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typedef struct
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{
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GstAllocator parent;
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} GstAllocatorSysmem;
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typedef struct
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{
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GstAllocatorClass parent_class;
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} GstAllocatorSysmemClass;
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static GType gst_allocator_sysmem_get_type (void);
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G_DEFINE_TYPE (GstAllocatorSysmem, gst_allocator_sysmem, GST_TYPE_ALLOCATOR);
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/* initialize the fields */
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static inline void
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_sysmem_init (GstMemorySystem * mem, GstMemoryFlags flags,
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GstMemory * parent, gsize slice_size,
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gpointer data, gsize maxsize, gsize align, gsize offset, gsize size,
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gpointer user_data, GDestroyNotify notify)
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{
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gst_memory_init (GST_MEMORY_CAST (mem),
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flags, _sysmem_allocator, parent, maxsize, align, offset, 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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}
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/* create a new memory block that manages the given memory */
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static inline GstMemorySystem *
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_sysmem_new (GstMemoryFlags flags,
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GstMemory * parent, gpointer data, gsize maxsize, gsize align, gsize offset,
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gsize size, gpointer user_data, GDestroyNotify notify)
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{
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GstMemorySystem *mem;
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gsize slice_size;
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slice_size = sizeof (GstMemorySystem);
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mem = g_slice_alloc (slice_size);
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_sysmem_init (mem, flags, parent, slice_size,
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data, maxsize, align, offset, size, 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 GstMemorySystem *
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_sysmem_new_block (GstMemoryFlags flags,
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gsize maxsize, gsize align, gsize offset, gsize size)
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{
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GstMemorySystem *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 (GstMemorySystem) + 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 (GstMemorySystem);
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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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_sysmem_init (mem, flags, NULL, slice_size, data, maxsize,
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align, offset, size, NULL, NULL);
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return mem;
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}
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static gpointer
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_sysmem_map (GstMemorySystem * 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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_sysmem_unmap (GstMemorySystem * mem)
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{
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return TRUE;
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}
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static GstMemorySystem *
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_sysmem_copy (GstMemorySystem * mem, gssize offset, gsize size)
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{
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GstMemorySystem *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 = _sysmem_new_block (0, size, mem->mem.align, 0, size);
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GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
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"memcpy %" G_GSIZE_FORMAT " memory %p -> %p", size, mem, copy);
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memcpy (copy->data, mem->data + mem->mem.offset + offset, size);
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return copy;
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}
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static GstMemorySystem *
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_sysmem_share (GstMemorySystem * mem, gssize offset, gsize size)
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{
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GstMemorySystem *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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/* the shared memory is always readonly */
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sub =
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_sysmem_new (GST_MINI_OBJECT_FLAGS (parent) |
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GST_MINI_OBJECT_FLAG_LOCK_READONLY, parent, mem->data, mem->mem.maxsize,
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mem->mem.align, mem->mem.offset + offset, size, NULL, NULL);
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return sub;
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}
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static gboolean
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_sysmem_is_span (GstMemorySystem * mem1, GstMemorySystem * mem2, gsize * offset)
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{
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if (offset) {
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GstMemorySystem *parent;
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parent = (GstMemorySystem *) 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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default_alloc (GstAllocator * allocator, gsize size,
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GstAllocationParams * params)
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{
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gsize maxsize = size + params->prefix + params->padding;
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return (GstMemory *) _sysmem_new_block (params->flags,
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maxsize, params->align, params->prefix, size);
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}
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static void
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default_free (GstAllocator * allocator, GstMemory * mem)
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{
|
|
GstMemorySystem *dmem = (GstMemorySystem *) mem;
|
|
gsize slice_size;
|
|
|
|
if (dmem->notify)
|
|
dmem->notify (dmem->user_data);
|
|
|
|
slice_size = dmem->slice_size;
|
|
|
|
#ifdef USE_POISONING
|
|
/* just poison the structs, not all the data */
|
|
memset (mem, 0xff, sizeof (GstMemorySystem));
|
|
#endif
|
|
|
|
g_slice_free1 (slice_size, mem);
|
|
}
|
|
|
|
static void
|
|
gst_allocator_sysmem_finalize (GObject * obj)
|
|
{
|
|
/* Don't raise warnings if we are shutting down */
|
|
if (_default_allocator)
|
|
g_warning ("The default memory allocator was freed!");
|
|
|
|
((GObjectClass *) gst_allocator_sysmem_parent_class)->finalize (obj);
|
|
}
|
|
|
|
static void
|
|
gst_allocator_sysmem_class_init (GstAllocatorSysmemClass * klass)
|
|
{
|
|
GObjectClass *gobject_class;
|
|
GstAllocatorClass *allocator_class;
|
|
|
|
gobject_class = (GObjectClass *) klass;
|
|
allocator_class = (GstAllocatorClass *) klass;
|
|
|
|
gobject_class->finalize = gst_allocator_sysmem_finalize;
|
|
|
|
allocator_class->alloc = default_alloc;
|
|
allocator_class->free = default_free;
|
|
}
|
|
|
|
static void
|
|
gst_allocator_sysmem_init (GstAllocatorSysmem * 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) _sysmem_map;
|
|
alloc->mem_unmap = (GstMemoryUnmapFunction) _sysmem_unmap;
|
|
alloc->mem_copy = (GstMemoryCopyFunction) _sysmem_copy;
|
|
alloc->mem_share = (GstMemoryShareFunction) _sysmem_share;
|
|
alloc->mem_is_span = (GstMemoryIsSpanFunction) _sysmem_is_span;
|
|
}
|
|
|
|
void
|
|
_priv_gst_allocator_initialize (void)
|
|
{
|
|
g_rw_lock_init (&lock);
|
|
allocators = g_hash_table_new_full (g_str_hash, g_str_equal, NULL,
|
|
gst_object_unref);
|
|
|
|
#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_allocator_sysmem_get_type (), NULL);
|
|
|
|
/* Clear floating flag */
|
|
gst_object_ref_sink (_sysmem_allocator);
|
|
|
|
gst_allocator_register (GST_ALLOCATOR_SYSMEM,
|
|
gst_object_ref (_sysmem_allocator));
|
|
|
|
_default_allocator = gst_object_ref (_sysmem_allocator);
|
|
}
|
|
|
|
void
|
|
_priv_gst_allocator_cleanup (void)
|
|
{
|
|
gst_object_unref (_sysmem_allocator);
|
|
_sysmem_allocator = NULL;
|
|
|
|
gst_object_unref (_default_allocator);
|
|
_default_allocator = NULL;
|
|
|
|
g_clear_pointer (&allocators, g_hash_table_unref);
|
|
}
|
|
|
|
/**
|
|
* gst_memory_new_wrapped:
|
|
* @flags: #GstMemoryFlags
|
|
* @data: (array length=size) (element-type guint8) (transfer none): data to
|
|
* wrap
|
|
* @maxsize: allocated size of @data
|
|
* @offset: offset in @data
|
|
* @size: size of valid data
|
|
* @user_data: (allow-none): user_data
|
|
* @notify: (allow-none) (scope async) (closure user_data): 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: (transfer full) (nullable): a new #GstMemory.
|
|
*/
|
|
GstMemory *
|
|
gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data,
|
|
gsize maxsize, gsize offset, gsize size, gpointer user_data,
|
|
GDestroyNotify notify)
|
|
{
|
|
GstMemorySystem *mem;
|
|
|
|
g_return_val_if_fail (data != NULL, NULL);
|
|
g_return_val_if_fail (offset + size <= maxsize, NULL);
|
|
|
|
mem =
|
|
_sysmem_new (flags, NULL, data, maxsize, 0, offset, size, user_data,
|
|
notify);
|
|
|
|
return (GstMemory *) mem;
|
|
}
|