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<html>
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<title>GstDmaBufAllocator: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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Top  | 
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                  Description
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Home
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GstDmaBufAllocator
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GstDmaBufAllocator — Memory wrapper for Linux dmabuf memory
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Functions
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GstAllocator *
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gst_dmabuf_allocator_new ()
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GstMemory *
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gst_dmabuf_allocator_alloc ()
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gint
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gst_dmabuf_memory_get_fd ()
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GType
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gst_dmabuf_allocator_get_type ()
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gboolean
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gst_is_dmabuf_memory ()
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Types and Values
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#define
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GST_CAPS_FEATURE_MEMORY_DMABUF
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Includes
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#include <gst/allocators/gstdmabuf.h>
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Description
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Functions
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gst_dmabuf_allocator_new ()
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GstAllocator *
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gst_dmabuf_allocator_new (void);
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Return a new dmabuf allocator.
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Returns
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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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[transfer full]
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Since: 1.2
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gst_dmabuf_allocator_alloc ()
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GstMemory *
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gst_dmabuf_allocator_alloc (GstAllocator *allocator,
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                            gint fd,
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                            gsize size);
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Return a GstMemory that wraps a dmabuf file descriptor.
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Parameters
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allocator
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allocator to be used for this memory
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fd
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dmabuf file descriptor
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size
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memory size
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Returns
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a GstMemory based on allocator
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.
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When the buffer will be released dmabuf allocator will close the fd
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.
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The memory is only mmapped on gst_buffer_mmap() request.
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[transfer full]
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Since: 1.2
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gst_dmabuf_memory_get_fd ()
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gint
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gst_dmabuf_memory_get_fd (GstMemory *mem);
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Return the file descriptor associated with mem
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.
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Parameters
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mem
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the memory to get the file descriptor
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Returns
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 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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Since: 1.2
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gst_dmabuf_allocator_get_type ()
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GType
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gst_dmabuf_allocator_get_type (void);
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gst_is_dmabuf_memory ()
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gboolean
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gst_is_dmabuf_memory (GstMemory *mem);
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Check if mem
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 is dmabuf memory.
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Parameters
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mem
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the memory to be check
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Returns
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 TRUE if mem
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is dmabuf memory, otherwise FALSE
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Since: 1.2
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Types and Values
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GST_CAPS_FEATURE_MEMORY_DMABUF
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#define GST_CAPS_FEATURE_MEMORY_DMABUF "memory:DMABuf"
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Constant that defines the caps feature name for DMA buffer sharing.
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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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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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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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This caps feature should not serve at all the purpose of selecting the
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GST_ALLOCATOR_DMABUF
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 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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Since: 1.12
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See Also
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GstMemory
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