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3205e90e83
Make a base class that can help with allocating fd-backed memory. Make dmabuf extend from the base class. We can now make methods to check if memory has an fd and get the fd for all the different types of fd-backed memory.
155 lines
4 KiB
C
155 lines
4 KiB
C
/* GStreamer dmabuf allocator
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* Copyright (C) 2013 Linaro SA
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* Author: Benjamin Gaignard <benjamin.gaignard@linaro.org> for Linaro.
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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 mordetails.
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstfdmemory.h"
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#include "gstdmabuf.h"
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/**
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* SECTION:gstdmabuf
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* @short_description: Memory wrapper for Linux dmabuf memory
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* @see_also: #GstMemory
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*
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* Since: 1.2
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*/
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#ifdef HAVE_MMAP
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#include <sys/mman.h>
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#include <unistd.h>
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#endif
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GST_DEBUG_CATEGORY_STATIC (dmabuf_debug);
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#define GST_CAT_DEFAULT dmabuf_debug
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typedef struct
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{
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GstFdAllocator parent;
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} GstDmaBufAllocator;
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typedef struct
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{
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GstFdAllocatorClass parent_class;
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} GstDmaBufAllocatorClass;
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GType dmabuf_mem_allocator_get_type (void);
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G_DEFINE_TYPE (GstDmaBufAllocator, dmabuf_mem_allocator, GST_TYPE_FD_ALLOCATOR);
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#define GST_TYPE_DMABUF_ALLOCATOR (dmabuf_mem_allocator_get_type())
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#define GST_IS_DMABUF_ALLOCATOR(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_DMABUF_ALLOCATOR))
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static void
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dmabuf_mem_allocator_class_init (GstDmaBufAllocatorClass * klass)
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{
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}
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static void
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dmabuf_mem_allocator_init (GstDmaBufAllocator * allocator)
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{
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GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
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alloc->mem_type = GST_ALLOCATOR_DMABUF;
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}
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/**
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* gst_dmabuf_allocator_new:
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*
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* Return a new dmabuf allocator.
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*
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* Returns: (transfer full): a new dmabuf allocator, or NULL if the allocator
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* isn't available. Use gst_object_unref() to release the allocator after
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* usage
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*
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* Since: 1.2
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*/
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GstAllocator *
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gst_dmabuf_allocator_new (void)
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{
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GST_DEBUG_CATEGORY_INIT (dmabuf_debug, "dmabuf", 0, "dmabuf memory");
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return g_object_new (GST_TYPE_DMABUF_ALLOCATOR, NULL);
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}
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/**
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* gst_dmabuf_allocator_alloc:
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* @allocator: (allow-none): allocator to be used for this memory
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* @fd: dmabuf file descriptor
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* @size: memory size
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*
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* Return a %GstMemory that wraps a dmabuf file descriptor.
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*
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* Returns: (transfer full): a GstMemory based on @allocator.
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* When the buffer will be released dmabuf allocator will close the @fd.
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* The memory is only mmapped on gst_buffer_mmap() request.
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*
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* Since: 1.2
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*/
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GstMemory *
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gst_dmabuf_allocator_alloc (GstAllocator * allocator, gint fd, gsize size)
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{
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GstFdAllocator *alloc = GST_FD_ALLOCATOR_CAST (allocator);
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GstFdAllocatorClass *klass = GST_FD_ALLOCATOR_GET_CLASS (alloc);
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if (!GST_IS_DMABUF_ALLOCATOR (allocator)) {
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GST_WARNING ("it isn't the correct allocator for dmabuf");
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return NULL;
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}
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GST_DEBUG ("alloc from allocator %p", allocator);
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return klass->alloc (alloc, fd, size, GST_FD_MEMORY_FLAG_NONE);
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}
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/**
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* gst_dmabuf_memory_get_fd:
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* @mem: the memory to get the file descriptor
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*
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* Return the file descriptor associated with @mem.
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*
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* Returns: the file descriptor associated with the memory, or -1. The file
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* descriptor is still owned by the GstMemory. Use dup to take a copy
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* if you intend to use it beyond the lifetime of this GstMemory.
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*
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* Since: 1.2
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*/
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gint
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gst_dmabuf_memory_get_fd (GstMemory * mem)
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{
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g_return_val_if_fail (gst_is_dmabuf_memory (mem), -1);
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return gst_fd_memory_get_fd (mem);
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}
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/**
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* gst_is_dmabuf_memory:
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* @mem: the memory to be check
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*
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* Check if @mem is dmabuf memory.
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*
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* Returns: %TRUE if @mem is dmabuf memory, otherwise %FALSE
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*
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* Since: 1.2
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*/
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gboolean
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gst_is_dmabuf_memory (GstMemory * mem)
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{
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return gst_memory_is_type (mem, GST_ALLOCATOR_DMABUF);
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}
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