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142 lines
3.6 KiB
C
142 lines
3.6 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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* @title: GstDmaBufAllocator
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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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G_DEFINE_TYPE (GstDmaBufAllocator, gst_dmabuf_allocator, GST_TYPE_FD_ALLOCATOR);
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static void
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gst_dmabuf_allocator_class_init (GstDmaBufAllocatorClass * klass)
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{
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}
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static void
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gst_dmabuf_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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GstAllocator *alloc;
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GST_DEBUG_CATEGORY_INIT (dmabuf_debug, "dmabuf", 0, "dmabuf memory");
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alloc = g_object_new (GST_TYPE_DMABUF_ALLOCATOR, NULL);
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gst_object_ref_sink (alloc);
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return alloc;
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}
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/**
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* gst_dmabuf_allocator_alloc:
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* @allocator: 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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g_return_val_if_fail (GST_IS_DMABUF_ALLOCATOR (allocator), NULL);
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return gst_fd_allocator_alloc (allocator, 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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g_return_val_if_fail (mem != NULL, FALSE);
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return GST_IS_DMABUF_ALLOCATOR (mem->allocator);
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}
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