gstreamer/subprojects/gst-plugins-base/gst-libs/gst/allocators/gstdmabuf.c

224 lines
5.9 KiB
C

/* GStreamer dmabuf allocator
* Copyright (C) 2013 Linaro SA
* Author: Benjamin Gaignard <benjamin.gaignard@linaro.org> for Linaro.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for mordetails.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstfdmemory.h"
#include "gstdmabuf.h"
/**
* SECTION:gstdmabuf
* @title: GstDmaBufAllocator
* @short_description: Memory wrapper for Linux dmabuf memory
* @see_also: #GstMemory
*
* Since: 1.2
*/
#ifdef HAVE_LINUX_DMA_BUF_H
#include <sys/ioctl.h>
#include <linux/dma-buf.h>
#endif
GST_DEBUG_CATEGORY_STATIC (dmabuf_debug);
#define GST_CAT_DEFAULT dmabuf_debug
#define _do_init \
GST_DEBUG_CATEGORY_INIT (dmabuf_debug, \
"dmabuf", 0, "dmabuf memory");
G_DEFINE_TYPE_WITH_CODE (GstDmaBufAllocator, gst_dmabuf_allocator,
GST_TYPE_FD_ALLOCATOR, _do_init);
static gpointer
gst_dmabuf_mem_map (GstMemory * gmem, GstMapInfo * info, gsize maxsize)
{
GstAllocator *allocator = gmem->allocator;
gpointer ret;
#ifdef HAVE_LINUX_DMA_BUF_H
struct dma_buf_sync sync = { DMA_BUF_SYNC_START };
if (info->flags & GST_MAP_READ)
sync.flags |= DMA_BUF_SYNC_READ;
if (info->flags & GST_MAP_WRITE)
sync.flags |= DMA_BUF_SYNC_WRITE;
#endif
ret = allocator->mem_map (gmem, maxsize, info->flags);
#ifdef HAVE_LINUX_DMA_BUF_H
if (ret) {
if (ioctl (gst_fd_memory_get_fd (gmem), DMA_BUF_IOCTL_SYNC, &sync) < 0)
GST_WARNING_OBJECT (allocator, "Failed to synchronize DMABuf: %s (%i)",
g_strerror (errno), errno);
}
#endif
return ret;
}
static void
gst_dmabuf_mem_unmap (GstMemory * gmem, GstMapInfo * info)
{
GstAllocator *allocator = gmem->allocator;
#ifdef HAVE_LINUX_DMA_BUF_H
struct dma_buf_sync sync = { DMA_BUF_SYNC_END };
if (info->flags & GST_MAP_READ)
sync.flags |= DMA_BUF_SYNC_READ;
if (info->flags & GST_MAP_WRITE)
sync.flags |= DMA_BUF_SYNC_WRITE;
if (ioctl (gst_fd_memory_get_fd (gmem), DMA_BUF_IOCTL_SYNC, &sync) < 0)
GST_WARNING_OBJECT (allocator, "Failed to synchronize DMABuf: %s (%i)",
g_strerror (errno), errno);
#else
GST_WARNING_OBJECT (allocator, "Using DMABuf without synchronization.");
#endif
allocator->mem_unmap (gmem);
}
static void
gst_dmabuf_allocator_class_init (GstDmaBufAllocatorClass * klass)
{
}
static void
gst_dmabuf_allocator_init (GstDmaBufAllocator * allocator)
{
GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
alloc->mem_type = GST_ALLOCATOR_DMABUF;
alloc->mem_map_full = gst_dmabuf_mem_map;
alloc->mem_unmap_full = gst_dmabuf_mem_unmap;
}
/**
* gst_dmabuf_allocator_new:
*
* Return a new dmabuf allocator.
*
* Returns: (transfer full): a new dmabuf allocator. Use gst_object_unref() to
* release the allocator after usage
*
* Since: 1.2
*/
GstAllocator *
gst_dmabuf_allocator_new (void)
{
GstAllocator *alloc;
alloc = g_object_new (GST_TYPE_DMABUF_ALLOCATOR, NULL);
gst_object_ref_sink (alloc);
return alloc;
}
/**
* gst_dmabuf_allocator_alloc:
* @allocator: allocator to be used for this memory
* @fd: dmabuf file descriptor
* @size: memory size
*
* Return a %GstMemory that wraps a dmabuf file descriptor.
*
* Returns: (transfer full) (nullable): a GstMemory based on @allocator.
* When the buffer will be released dmabuf allocator will close the @fd.
* The memory is only mmapped on gst_buffer_map() request.
*
* Since: 1.2
*/
GstMemory *
gst_dmabuf_allocator_alloc (GstAllocator * allocator, gint fd, gsize size)
{
g_return_val_if_fail (GST_IS_DMABUF_ALLOCATOR (allocator), NULL);
return gst_fd_allocator_alloc (allocator, fd, size, GST_FD_MEMORY_FLAG_NONE);
}
/**
* gst_dmabuf_allocator_alloc_with_flags:
* @allocator: allocator to be used for this memory
* @fd: dmabuf file descriptor
* @size: memory size
* @flags: extra #GstFdMemoryFlags
*
* Return a %GstMemory that wraps a dmabuf file descriptor.
*
* Returns: (transfer full) (nullable): a GstMemory based on @allocator.
*
* When the buffer will be released the allocator will close the @fd unless
* the %GST_FD_MEMORY_FLAG_DONT_CLOSE flag is specified.
* The memory is only mmapped on gst_buffer_mmap() request.
*
* Since: 1.16
*/
GstMemory *
gst_dmabuf_allocator_alloc_with_flags (GstAllocator * allocator, gint fd,
gsize size, GstFdMemoryFlags flags)
{
g_return_val_if_fail (GST_IS_DMABUF_ALLOCATOR (allocator), NULL);
return gst_fd_allocator_alloc (allocator, fd, size, flags);
}
/**
* gst_dmabuf_memory_get_fd:
* @mem: the memory to get the file descriptor
*
* Return the file descriptor associated with @mem.
*
* Returns: the file descriptor associated with the memory, or -1. The file
* descriptor is still owned by the GstMemory. Use dup to take a copy
* if you intend to use it beyond the lifetime of this GstMemory.
*
* Since: 1.2
*/
gint
gst_dmabuf_memory_get_fd (GstMemory * mem)
{
g_return_val_if_fail (gst_is_dmabuf_memory (mem), -1);
return gst_fd_memory_get_fd (mem);
}
/**
* gst_is_dmabuf_memory:
* @mem: the memory to be check
*
* Check if @mem is dmabuf memory.
*
* Returns: %TRUE if @mem is dmabuf memory, otherwise %FALSE
*
* Since: 1.2
*/
gboolean
gst_is_dmabuf_memory (GstMemory * mem)
{
g_return_val_if_fail (mem != NULL, FALSE);
return GST_IS_DMABUF_ALLOCATOR (mem->allocator);
}