allocators: move GstPhysMemoryAllocator abstraction from -bad to -base

This can be used in a generic way as common interface by all platforms
that, in one way or another, pass around physical memory addresses.

This is used by the gl lib and seems useful enough, so might just as
well move it next to the other allocators.

https://bugzilla.gnome.org/show_bug.cgi?id=779067

gst-libs/gst/allocators/Makefile.am

@@ -5,12 +5,14 @@ libgstallocators_@GST_API_VERSION@_includedir = $(includedir)/gstreamer-@GST_API
 libgstallocators_@GST_API_VERSION@_include_HEADERS = \
 	allocators.h \
 	gstfdmemory.h \
+	gstphysmemory.h \
 	gstdmabuf.h
 
 noinst_HEADERS =
 
 libgstallocators_@GST_API_VERSION@_la_SOURCES = \
 	gstfdmemory.c \
+	gstphysmemory.c \
 	gstdmabuf.c 
 
 libgstallocators_@GST_API_VERSION@_la_LIBADD = $(GST_LIBS) $(LIBM)

gst-libs/gst/allocators/allocators.h

@@ -24,6 +24,7 @@
 
 #include <gst/allocators/gstdmabuf.h>
 #include <gst/allocators/gstfdmemory.h>
+#include <gst/allocators/gstphysmemory.h>
 
 #endif /* __GST_ALLOCATORS_H__ */
 

gst-libs/gst/allocators/gstphysmemory.c

@@ -0,0 +1,69 @@
+/* GStreamer
+ * Copyright (C) 2017 Sebastian Dröge <sebastian@centricular.com>
+ *
+ * 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 more details.
+ *
+ * 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 "gstphysmemory.h"
+
+G_DEFINE_INTERFACE (GstPhysMemoryAllocator, gst_phys_memory_allocator,
+    GST_TYPE_ALLOCATOR);
+
+static void
+gst_phys_memory_allocator_default_init (GstPhysMemoryAllocatorInterface * iface)
+{
+}
+
+/**
+ * gst_is_phys_memory:
+ * @mem: a #GstMemory
+ *
+ * Returns: whether the memory at @mem is backed by physical memory
+ *
+ * Since: 1.14
+ */
+gboolean
+gst_is_phys_memory (GstMemory * mem)
+{
+  return mem != NULL && mem->allocator != NULL
+      && g_type_is_a (G_OBJECT_TYPE (mem->allocator),
+      GST_TYPE_PHYS_MEMORY_ALLOCATOR);
+}
+
+/**
+ * gst_phys_memory_get_phys_addr:
+ * @mem: a #GstMemory
+ *
+ * Returns: Physical memory address that is backing @mem, or 0 if none
+ *
+ * Since: 1.14
+ */
+guintptr
+gst_phys_memory_get_phys_addr (GstMemory * mem)
+{
+  GstPhysMemoryAllocatorInterface *iface;
+
+  g_return_val_if_fail (gst_is_phys_memory (mem), 0);
+
+  iface = GST_PHYS_MEMORY_ALLOCATOR_GET_INTERFACE (mem->allocator);
+  g_return_val_if_fail (iface->get_phys_addr != NULL, 0);
+
+  return iface->get_phys_addr ((GstPhysMemoryAllocator *) mem->allocator, mem);
+}

gst-libs/gst/allocators/gstphysmemory.h

@@ -0,0 +1,63 @@
+/* GStreamer
+ * Copyright (C) 2017 Sebastian Dröge <sebastian@centricular.com>
+ *
+ * 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 more details.
+ *
+ * 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.
+ */
+
+#ifndef __GST_PHYS_MEMORY_H__
+#define __GST_PHYS_MEMORY_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+typedef struct _GstPhysMemoryAllocator GstPhysMemoryAllocator;
+typedef struct _GstPhysMemoryAllocatorInterface GstPhysMemoryAllocatorInterface;
+
+#define GST_TYPE_PHYS_MEMORY_ALLOCATOR                  (gst_phys_memory_allocator_get_type())
+#define GST_IS_PHYS_MEMORY_ALLOCATOR(obj)               (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PHYS_MEMORY_ALLOCATOR))
+#define GST_IS_PHYS_MEMORY_ALLOCATOR_INTERFACE(iface)   (G_TYPE_CHECK_INTERFACE_TYPE ((iface), GST_TYPE_PHYS_MEMORY_ALLOCATOR))
+#define GST_PHYS_MEMORY_ALLOCATOR_GET_INTERFACE(obj)    (G_TYPE_INSTANCE_GET_INTERFACE ((obj), GST_TYPE_PHYS_MEMORY_ALLOCATOR, GstPhysMemoryAllocatorInterface))
+#define GST_PHYS_MEMORY_ALLOCATOR(obj)                  (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PHYS_MEMORY_ALLOCATOR, GstPhysMemoryAllocator))
+#define GST_PHYS_MEMORY_ALLOCATOR_INTERFACE(iface)      (G_TYPE_CHECK_INTERFACE_CAST ((iface), GST_TYPE_PHYS_MEMORY_ALLOCATOR, GstPhysMemoryAllocatorInterface))
+#define GST_PHYS_MEMORY_ALLOCATOR_CAST(obj)             ((GstPhysMemoryAllocator *)(obj))
+
+/**
+ * GstPhysMemoryAllocatorInterface:
+ *
+ * Marker interface for allocators with physical address backed memory
+ *
+ * Since: 1.14
+ */
+struct _GstPhysMemoryAllocatorInterface
+{
+  GTypeInterface parent_iface;
+
+  guintptr (*get_phys_addr) (GstPhysMemoryAllocator * allocator, GstMemory * mem);
+};
+
+GST_EXPORT
+GType gst_phys_memory_allocator_get_type (void);
+
+GST_EXPORT
+gboolean gst_is_phys_memory (GstMemory *mem);
+
+GST_EXPORT
+guintptr gst_phys_memory_get_phys_addr (GstMemory * mem);
+
+G_END_DECLS
+
+#endif /* __GST_PHYS_MEMORY_H__ */