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/*
* Copyright (C) 2018 Igalia S.L
* Copyright (C) 2018 Metrological Group B.V.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "GstAllocatorFastMalloc.h"
#include <gst/gst.h>
#include <wtf/FastMalloc.h>
typedef struct {
GstMemory base;
uint8_t* data;
} GstMemoryFastMalloc;
typedef struct {
GstAllocator parent;
} GstAllocatorFastMalloc;
typedef struct {
GstAllocatorClass parent;
} GstAllocatorFastMallocClass;
G_DEFINE_TYPE(GstAllocatorFastMalloc, gst_allocator_fast_malloc, GST_TYPE_ALLOCATOR)
static GstMemoryFastMalloc* gstMemoryFastMallocNew(GstAllocator* allocator, gsize size, gsize alignment, gsize offset, gsize padding, GstMemoryFlags flags)
{
// alignment should be a (power-of-two - 1).
alignment |= gst_memory_alignment;
ASSERT(!((alignment + 1) & alignment));
// GStreamer's allocator requires heap allocations.
DisableMallocRestrictionsForCurrentThreadScope disableMallocRestrictions;
gsize headerSize = (sizeof(GstMemoryFastMalloc) + alignment) & ~alignment;
gsize allocationSize = offset + size + padding;
auto* memory = static_cast<GstMemoryFastMalloc*>(tryFastAlignedMalloc(alignment + 1, headerSize + allocationSize));
if (!memory)
return nullptr;
memory->data = reinterpret_cast<uint8_t*>(memory) + headerSize;
if (offset && (flags & GST_MEMORY_FLAG_ZERO_PREFIXED))
std::memset(memory->data, 0, offset);
if (padding && (flags & GST_MEMORY_FLAG_ZERO_PADDED))
std::memset(memory->data + offset + size, 0, padding);
gst_memory_init(GST_MEMORY_CAST(memory), flags, allocator, nullptr, allocationSize, alignment, offset, size);
return memory;
}
static GstMemory* gstAllocatorFastMallocAlloc(GstAllocator* allocator, gsize size, GstAllocationParams* params)
{
ASSERT(G_TYPE_CHECK_INSTANCE_TYPE(allocator, gst_allocator_fast_malloc_get_type()));
return GST_MEMORY_CAST(gstMemoryFastMallocNew(allocator, size, params->align, params->prefix, params->padding, params->flags));
}
static void gstAllocatorFastMallocFree(GstAllocator* allocator, GstMemory* memory)
{
#if ASSERT_ENABLED
ASSERT(G_TYPE_CHECK_INSTANCE_TYPE(allocator, gst_allocator_fast_malloc_get_type()));
#else
UNUSED_PARAM(allocator);
#endif
fastAlignedFree(memory);
}
static gpointer gstAllocatorFastMallocMemMap(GstMemoryFastMalloc* memory, gsize, GstMapFlags)
{
return memory->data;
}
static void gstAllocatorFastMallocMemUnmap(GstMemoryFastMalloc*)
{
}
static GstMemoryFastMalloc* gstAllocatorFastMallocMemCopy(GstMemoryFastMalloc* memory, gssize offset, gsize size)
{
if (size == static_cast<gsize>(-1))
size = memory->base.size > static_cast<gsize>(offset) ? memory->base.size - offset : 0;
auto* copy = gstMemoryFastMallocNew(memory->base.allocator, size, memory->base.align, 0, 0, static_cast<GstMemoryFlags>(0));
if (!copy)
return nullptr;
std::memcpy(copy->data, memory->data + memory->base.offset + offset, size);
return copy;
}
static GstMemoryFastMalloc* gstAllocatorFastMallocMemShare(GstMemoryFastMalloc* memory, gssize offset, gsize size)
{
GstMemoryFastMalloc* sharedMemory;
if (!tryFastMalloc(sizeof(GstMemoryFastMalloc)).getValue(sharedMemory))
return nullptr;
sharedMemory->data = memory->data;
if (size == static_cast<gsize>(-1))
size = memory->base.size - offset;
auto* parent = memory->base.parent ? memory->base.parent : GST_MEMORY_CAST(memory);
gst_memory_init(GST_MEMORY_CAST(sharedMemory),
static_cast<GstMemoryFlags>(GST_MINI_OBJECT_FLAGS(parent) | GST_MINI_OBJECT_FLAG_LOCK_READONLY),
memory->base.allocator, parent, memory->base.maxsize, memory->base.align,
memory->base.offset + offset, size);
return sharedMemory;
}
static gboolean gstAllocatorFastMallocMemIsSpan(GstMemoryFastMalloc* memory, GstMemoryFastMalloc* other, gsize* offset)
{
if (offset) {
auto* parent = reinterpret_cast<GstMemoryFastMalloc*>(memory->base.parent);
ASSERT(parent);
*offset = memory->base.offset - parent->base.offset;
}
return memory->data + memory->base.offset + memory->base.size == other->data + other->base.offset;
}
static void gst_allocator_fast_malloc_class_init(GstAllocatorFastMallocClass* klass)
{
auto* gstAllocatorClass = GST_ALLOCATOR_CLASS(klass);
gstAllocatorClass->alloc = gstAllocatorFastMallocAlloc;
gstAllocatorClass->free = gstAllocatorFastMallocFree;
}
static void gst_allocator_fast_malloc_init(GstAllocatorFastMalloc* allocator)
{
auto* baseAllocator = GST_ALLOCATOR_CAST(allocator);
baseAllocator->mem_type = "FastMalloc";
baseAllocator->mem_map = reinterpret_cast<GstMemoryMapFunction>(gstAllocatorFastMallocMemMap);
baseAllocator->mem_unmap = reinterpret_cast<GstMemoryUnmapFunction>(gstAllocatorFastMallocMemUnmap);
baseAllocator->mem_copy = reinterpret_cast<GstMemoryCopyFunction>(gstAllocatorFastMallocMemCopy);
baseAllocator->mem_share = reinterpret_cast<GstMemoryShareFunction>(gstAllocatorFastMallocMemShare);
baseAllocator->mem_is_span = reinterpret_cast<GstMemoryIsSpanFunction>(gstAllocatorFastMallocMemIsSpan);
}
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