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119 lines
4.2 KiB
C
119 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: 1.12
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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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GST_EXPORT
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GType gst_dmabuf_allocator_get_type (void);
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GST_EXPORT
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GstAllocator * gst_dmabuf_allocator_new (void);
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GST_EXPORT
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GstMemory * gst_dmabuf_allocator_alloc (GstAllocator * allocator, gint fd, gsize size);
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GST_EXPORT
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gint gst_dmabuf_memory_get_fd (GstMemory * mem);
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GST_EXPORT
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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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