Cleanup QCameraInfo

Various API changes to QCameraInfo:

* Remove the camera orientation from our API This is
an implementation detail that should never be exposed
to the user. For fixed cameras it's uninteresting
and for mobile cameras, we can use the physical orientation
of the device to create a stream that is oriented the
correct way.
* Add a QVideoFormat class describing a video format
* Add a QList<QVideoFormat> videoFormats()
* Add a QList<QSize> photoResolutions()
* Implement the API for gstreamer and macOS.

Change-Id: I9ffd9caeb6d07a6f267608a6bd794d99699fffbb
Reviewed-by: Doris Verria <doris.verria@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 140 insertions, 0 deletions

diff --git a/cmake/FindGStreamer.cmake b/cmake/FindGStreamer.cmake
new file mode 100644
index 000000000..ef9edd485
--- /dev/null
+++ b/cmake/FindGStreamer.cmake
@@ -0,0 +1,140 @@
+# FindGStreamer
+# ---------
+#
+# Locate the gstreamer-1.0 library and some of its plugins.
+# Defines the following imported target:
+#
+#   ``GStreamer::GStreamer``
+#       If the gstreamer-1.0 library is available and target GStreamer::Base,
+#       GStreamer::Audio, GStreamer::Video, GStreamer::Pbutils and
+#       GStreamer::Allocators exist
+#
+#  If target GStreamer::GStreamer exists, the following targets may be defined:
+#
+#   ``GStreamer::App``
+#       If the gstapp-1.0 library is available and target GStreamer::GStreamer exists
+#   ``GStreamer::Photography``
+#       If the gstphotography-1.0 library is available and target GStreamer::GStreamer exists
+#   ``GStreamer::Gl``
+#       If the gstgl-1.0 library is available and target GStreamer::GStreamer exists
+#
+
+include(CMakeFindDependencyMacro)
+find_dependency(GObject)
+
+find_package(PkgConfig QUIET)
+function(find_gstreamer_component component prefix header library)
+    if(NOT TARGET GStreamer::${component})
+        string(TOUPPER ${component} upper)
+        pkg_check_modules(PC_GSTREAMER_${upper} ${prefix} IMPORTED_TARGET)
+        if(TARGET PkgConfig::PC_GSTREAMER_${upper})
+            add_library(GStreamer::${component} INTERFACE IMPORTED)
+            target_link_libraries(GStreamer::${component} INTERFACE PkgConfig::PC_GSTREAMER_${upper})
+        else()
+            find_path(GStreamer_${component}_INCLUDE_DIR
+                NAMES ${header}
+                PATH_SUFFIXES gstreamer-1.0
+            )
+            find_library(GStreamer_${component}_LIBRARY
+                NAMES ${library}
+            )
+            if(${component} STREQUAL "Gl")
+                # search the gstglconfig.h include dir under the same root where the library is found
+                get_filename_component(gstglLibDir "${GStreamer_Gl_LIBRARY}" PATH)
+                find_path(GStreamer_GlConfig_INCLUDE_DIR
+                    NAMES gst/gl/gstglconfig.h
+                    PATH_SUFFIXES gstreamer-1.0/include
+                    HINTS ${PC_GSTREAMER_GL_INCLUDE_DIRS} ${PC_GSTREAMER_GL_INCLUDEDIR} "${gstglLibDir}"
+                )
+                if(GStreamer_GlConfig_INCLUDE_DIR)
+                    list(APPEND GStreamer_Gl_INCLUDE_DIR "${GStreamer_GlConfig_INCLUDE_DIR}")
+                    list(REMOVE_DUPLICATES GStreamer_Gl_INCLUDE_DIR)
+                endif()
+            endif()
+            if(GStreamer_${component}_LIBRARY AND GStreamer_${component}_INCLUDE_DIR)
+                add_library(GStreamer::${component} INTERFACE IMPORTED)
+                target_include_directories(GStreamer::${component} INTERFACE GStreamer_${component}_INCLUDE_DIR)
+                target_link_libraries(GStreamer::${component} INTERFACE GStreamer_${component}_LIBRARY)
+            endif()
+            mark_as_advanced(GStreamer_${component}_INCLUDE_DIR GStreamer_${component}_LIBRARY)
+        endif()
+    endif()
+
+    if(TARGET GStreamer::${component})
+        set(GStreamer_${component}_FOUND TRUE PARENT_SCOPE)
+    endif()
+endfunction()
+
+# GStreamer required dependencies
+find_gstreamer_component(Core gstreamer-1.0 gst/gst.h gstreamer-1.0)
+find_gstreamer_component(Base gstreamer-base-1.0 gst/gst.h gstbase-1.0)
+find_gstreamer_component(Audio gstreamer-audio-1.0 gst/audio/audio.h gstaudio-1.0)
+find_gstreamer_component(Video gstreamer-video-1.0 gst/video/video.h gstvideo-1.0)
+find_gstreamer_component(Pbutils gstreamer-pbutils-1.0 gst/pbutils/pbutils.h gstpbutils-1.0)
+find_gstreamer_component(Allocators gstreamer-allocators-1.0 gst/allocators/allocators.h gstallocators-1.0)
+
+if(TARGET GStreamer::Core)
+    target_link_libraries(GStreamer::Core INTERFACE GObject::GObject)
+endif()
+if(TARGET GStreamer::Base AND TARGET GStreamer::Core)
+    target_link_libraries(GStreamer::Base INTERFACE GStreamer::Core)
+endif()
+if(TARGET GStreamer::Audio AND TARGET GStreamer::Base)
+    target_link_libraries(GStreamer::Audio INTERFACE GStreamer::Base)
+endif()
+if(TARGET GStreamer::Video AND TARGET GStreamer::Base)
+    target_link_libraries(GStreamer::Video INTERFACE GStreamer::Base)
+endif()
+if(TARGET GStreamer::Pbutils AND TARGET GStreamer::Audio AND TARGET GStreamer::Video)
+    target_link_libraries(GStreamer::Pbutils INTERFACE GStreamer::Audio GStreamer::Video)
+endif()
+if(TARGET GStreamer::Allocators AND TARGET GStreamer::Core)
+    target_link_libraries(GStreamer::Allocators INTERFACE GStreamer::Core)
+endif()
+
+# GStreamer optional components
+foreach(component ${GStreamer_FIND_COMPONENTS})
+    if (${component} STREQUAL "App")
+        find_gstreamer_component(App gstreamer-app-1.0 gst/app/gstappsink.h gstapp-1.0)
+        if(TARGET GStreamer::App AND TARGET GStreamer::Base)
+            target_link_libraries(GStreamer::App INTERFACE GStreamer::Base)
+        endif()
+    elseif (${component} STREQUAL "Photography")
+        find_gstreamer_component(Photography gstreamer-photography-1.0 gst/interfaces/photography.h gstphotography-1.0)
+        if(TARGET GStreamer::Photography AND TARGET GStreamer::Core)
+            target_link_libraries(GStreamer::Photography INTERFACE GStreamer::Core)
+        endif()
+    elseif (${component} STREQUAL "Gl")
+        find_gstreamer_component(Gl gstreamer-gl-1.0 gst/gl/gl.h gstgl-1.0)
+        if(TARGET GStreamer::Gl AND TARGET GStreamer::Video AND TARGET GStreamer::Allocators)
+            target_link_libraries(GStreamer::Gl INTERFACE GStreamer::Video GStreamer::Allocators)
+        endif()
+    else()
+        message(WARNING "FindGStreamer.cmake: Invalid Gstreamer component \"${component}\" requested")
+    endif()
+endforeach()
+
+# Create target GStreamer::GStreamer
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(GStreamer
+                                REQUIRED_VARS
+                                GStreamer_Core_FOUND
+                                GStreamer_Base_FOUND
+                                GStreamer_Audio_FOUND
+                                GStreamer_Video_FOUND
+                                GStreamer_Pbutils_FOUND
+                                GStreamer_Allocators_FOUND
+                                HANDLE_COMPONENTS
+)
+
+if(GStreamer_FOUND AND NOT TARGET GStreamer::GStreamer)
+    add_library(GStreamer::GStreamer INTERFACE IMPORTED)
+    target_link_libraries(GStreamer::GStreamer INTERFACE
+                            GStreamer::Core
+                            GStreamer::Base
+                            GStreamer::Audio
+                            GStreamer::Video
+                            GStreamer::Pbutils
+                            GStreamer::Allocators
+    )
+endif()