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a1a2a33315
This class was made subclassable, though for future growth of the code, it's better if we have some room for add class members. Using the small padding since this is unlikely.
115 lines
4.2 KiB
C
115 lines
4.2 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 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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#ifndef __GST_DMABUF_H__
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#define __GST_DMABUF_H__
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#include <gst/gst.h>
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#include <gst/allocators/gstfdmemory.h>
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G_BEGIN_DECLS
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/**
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* GST_CAPS_FEATURE_MEMORY_DMABUF:
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*
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* Constant that defines the caps feature name for DMA buffer sharing.
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*
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* It has to be used for non-mappable dma-buf only, i.e. when the underlying
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* memory is not mappable to user space. Or when the mapped memory contains
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* non meaningful data. It can be the case for protected content or when the
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* user wants explicitly avoid any software post processing.
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*
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* In these cases all elements between the exported and the importer has to work
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* in passthrough mode. This is done by adding this caps feature.
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*
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* When the memory is mappable for read and write requests then it is assumes
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* to be a fast path and so this caps feature should not be used. Though
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* according to the dma-buf protocal, while it is mapped it prevents the
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* exporter to migrate the buffer.
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*
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* This caps feature should not serve at all the purpose of selecting the
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* @GST_ALLOCATOR_DMABUF allocator during caps negotiation.
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* When the exporter is the upstream element from the importer point of view,
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* the exporter should try to map the dma buffer at runtime (preferrably during
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* decide_allocation phase). When it succeeds for #GST_MAP_READWRITE this caps
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* feature should not be used. This allows scalers, color converts and any image
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* processing filters to work directly on the dma buffer.
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* In this case the importer element should check all incomming memory using
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* gst_is_dmabuf_memory().
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*
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* Since: 1.11
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*/
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#define GST_CAPS_FEATURE_MEMORY_DMABUF "memory:DMABuf"
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#define GST_ALLOCATOR_DMABUF "dmabuf"
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#define GST_TYPE_DMABUF_ALLOCATOR (gst_dmabuf_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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#define GST_IS_DMABUF_ALLOCATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_DMABUF_ALLOCATOR))
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#define GST_DMABUF_ALLOCATOR_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_DMABUF_ALLOCATOR, GstDmaBufAllocatorClass))
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#define GST_DMABUF_ALLOCATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_DMABUF_ALLOCATOR, GstDmaBufAllocator))
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#define GST_DMABUF_ALLOCATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_DMABUF_ALLOCATOR, GstDmaBufAllocatorClass))
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#define GST_DMABUF_ALLOCATOR_CAST(obj) ((GstDmaBufAllocator *)(obj))
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typedef struct _GstDmaBufAllocator GstDmaBufAllocator;
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typedef struct _GstDmaBufAllocatorClass GstDmaBufAllocatorClass;
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/**
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* GstDmaBufAllocator:
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*
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* Base class for allocators with dmabuf-backed memory
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*
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* Since: 1.12
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*/
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struct _GstDmaBufAllocator
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{
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GstFdAllocator parent;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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struct _GstDmaBufAllocatorClass
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{
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GstFdAllocatorClass parent_class;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_dmabuf_allocator_get_type (void);
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GstAllocator * gst_dmabuf_allocator_new (void);
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GstMemory * gst_dmabuf_allocator_alloc (GstAllocator * allocator, gint fd, gsize size);
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gint gst_dmabuf_memory_get_fd (GstMemory * mem);
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gboolean gst_is_dmabuf_memory (GstMemory * mem);
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#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstDmaBufAllocator, gst_object_unref)
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#endif
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G_END_DECLS
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#endif /* __GST_DMABUF_H__ */
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