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b6411ae74c
For each lib we build export its own API in headers when we're building it, otherwise import the API from the headers. This fixes linker warnings on Windows when building with MSVC. The problem was that we had defined all GST_*_API decorators unconditionally to GST_EXPORT. This was intentional and only supposed to be temporary, but caused linker warnings because we tell the linker that we want to export all symbols even those from externall DLLs, and when the linker notices that they were in external DLLS and not present locally it warns. What we need to do when building each library is: export the library's own symbols and import all other symbols. To this end we define e.g. BUILDING_GST_FOO and then we define the GST_FOO_API decorator either to export or to import symbols depending on whether BUILDING_GST_FOO is set or not. That way external users of each library API automatically get the import. While we're at it, add new GST_API_EXPORT in config.h and use that for GST_*_API decorators instead of GST_EXPORT. The right export define depends on the toolchain and whether we're using -fvisibility=hidden or not, so it's better to set it to the right thing directly than hard-coding a compiler whitelist in the public header. We put the export define into config.h instead of passing it via the command line to the compiler because it might contain spaces and brackets and in the autotools scenario we'd have to pass that through multiple layers of plumbing and Makefile/shell escaping and we're just not going to be *that* lucky. The export define is only used if we're compiling our lib, not by external users of the lib headers, so it's not a problem to put it into config.h Also, this means all .c files of libs need to include config.h to get the export marker defined, so fix up a few that didn't include config.h. This commit depends on a common submodule commit that makes gst-glib-gen.mak add an #include "config.h" to generated enum/marshal .c files for the autotools build. https://bugzilla.gnome.org/show_bug.cgi?id=797185
102 lines
3 KiB
C
102 lines
3 KiB
C
/*
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* GStreamer Wayland Library
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* Copyright (C) 2014 Collabora Ltd.
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_WAYLAND_H__
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#define __GST_WAYLAND_H__
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#ifndef GST_USE_UNSTABLE_API
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#warning "The GStreamer wayland library is unstable API and may change in future."
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#warning "You can define GST_USE_UNSTABLE_API to avoid this warning."
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#endif
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#include <gst/gst.h>
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#include <wayland-client.h>
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#ifndef GST_WAYLAND_API
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# ifdef BUILDING_GST_WAYLAND
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# define GST_WAYLAND_API GST_API_EXPORT /* from config.h */
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# else
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# define GST_WAYLAND_API GST_API_IMPORT
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# endif
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#endif
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G_BEGIN_DECLS
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/* The type of GstContext used to pass the wl_display pointer
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* from the application to the sink */
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#define GST_WAYLAND_DISPLAY_HANDLE_CONTEXT_TYPE "GstWaylandDisplayHandleContextType"
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GST_WAYLAND_API
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gboolean gst_is_wayland_display_handle_need_context_message (GstMessage * msg);
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GST_WAYLAND_API
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GstContext *
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gst_wayland_display_handle_context_new (struct wl_display * display);
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GST_WAYLAND_API
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struct wl_display *
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gst_wayland_display_handle_context_get_handle (GstContext * context);
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#define GST_TYPE_WAYLAND_VIDEO \
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(gst_wayland_video_get_type ())
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#define GST_WAYLAND_VIDEO(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_WAYLAND_VIDEO, GstWaylandVideo))
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#define GST_IS_WAYLAND_VIDEO(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_WAYLAND_VIDEO))
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#define GST_WAYLAND_VIDEO_GET_INTERFACE(inst) \
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(G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_WAYLAND_VIDEO, GstWaylandVideoInterface))
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/**
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* GstWaylandVideo:
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*
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* Opaque #GstWaylandVideo interface structure
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*/
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typedef struct _GstWaylandVideo GstWaylandVideo;
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typedef struct _GstWaylandVideoInterface GstWaylandVideoInterface;
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/**
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* GstWaylandVideoInterface:
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* @iface: parent interface type.
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*
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* #GstWaylandVideo interface
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*/
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struct _GstWaylandVideoInterface {
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GTypeInterface iface;
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/* virtual functions */
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void (*begin_geometry_change) (GstWaylandVideo *video);
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void (*end_geometry_change) (GstWaylandVideo *video);
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};
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GST_WAYLAND_API
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GType gst_wayland_video_get_type (void);
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/* virtual function wrappers */
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GST_WAYLAND_API
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void gst_wayland_video_begin_geometry_change (GstWaylandVideo * video);
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GST_WAYLAND_API
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void gst_wayland_video_end_geometry_change (GstWaylandVideo * video);
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G_END_DECLS
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#endif /* __GST_WAYLAND_H__ */
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