build: borrow CMake modules from qt-gstreamer for Linux compatibility

Almost certainly breaks Windows compat, but will need to update it anyways to work with the newer GStreamer SDK.
2012-06-13 06:41:44 -04:00
parent cca79973df
commit 7b8742afd8
9 changed files with 611 additions and 206 deletions
--- a/cmake/modules/FindGStreamer.cmake
+++ b/cmake/modules/FindGStreamer.cmake
@@ -0,0 +1,135 @@
+# - Try to find GStreamer
+# Once done this will define
+#
+#  GSTREAMER_FOUND - system has GStreamer
+#  GSTREAMER_INCLUDE_DIR - the GStreamer include directory
+#  GSTREAMER_LIBRARY - the main GStreamer library
+#  GSTREAMER_PLUGIN_DIR - the GStreamer plugin directory
+#
+#  And for all the plugin libraries specified in the COMPONENTS
+#  of find_package, this module will define:
+#
+#  GSTREAMER_<plugin_lib>_LIBRARY_FOUND - system has <plugin_lib>
+#  GSTREAMER_<plugin_lib>_LIBRARY - the <plugin_lib> library
+#  GSTREAMER_<plugin_lib>_INCLUDE_DIR - the <plugin_lib> include directory
+#
+# Copyright (c) 2010, Collabora Ltd.
+#   @author George Kiagiadakis <george.kiagiadakis@collabora.co.uk>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+if (GSTREAMER_INCLUDE_DIR AND GSTREAMER_LIBRARY)
+    set(GStreamer_FIND_QUIETLY TRUE)
+else()
+    set(GStreamer_FIND_QUIETLY FALSE)
+endif()
+
+set(GSTREAMER_ABI_VERSION "0.10")
+
+
+# Find the main library
+find_package(PkgConfig)
+
+if (PKG_CONFIG_FOUND)
+    pkg_check_modules(PKG_GSTREAMER gstreamer-${GSTREAMER_ABI_VERSION})
+    exec_program(${PKG_CONFIG_EXECUTABLE}
+                 ARGS --variable pluginsdir gstreamer-${GSTREAMER_ABI_VERSION}
+                 OUTPUT_VARIABLE PKG_GSTREAMER_PLUGIN_DIR)
+endif()
+
+find_library(GSTREAMER_LIBRARY
+             NAMES gstreamer-${GSTREAMER_ABI_VERSION} 
+             HINTS ${PKG_GSTREAMER_LIBRARY_DIRS} ${PKG_GSTREAMER_LIBDIR}
+             PATH_SUFFIXES .libs)
+
+find_path(GSTREAMER_INCLUDE_DIR
+          gst/gst.h
+          HINTS ${PKG_GSTREAMER_INCLUDE_DIRS} ${PKG_GSTREAMER_INCLUDEDIR}
+          PATH_SUFFIXES gstreamer-${GSTREAMER_ABI_VERSION})
+
+if (PKG_GSTREAMER_PLUGIN_DIR)
+    set(_GSTREAMER_PLUGIN_DIR ${PKG_GSTREAMER_PLUGIN_DIR})
+else()
+    get_filename_component(_GSTREAMER_LIB_DIR ${GSTREAMER_LIBRARY} PATH)
+    set(_GSTREAMER_PLUGIN_DIR ${_GSTREAMER_LIB_DIR}/gstreamer-${GSTREAMER_ABI_VERSION})
+endif()
+
+set(GSTREAMER_PLUGIN_DIR ${_GSTREAMER_PLUGIN_DIR}
+    CACHE PATH "The path to the gstreamer plugins installation directory")
+
+mark_as_advanced(GSTREAMER_LIBRARY GSTREAMER_INCLUDE_DIR GSTREAMER_PLUGIN_DIR)
+
+
+# Find additional libraries
+include(MacroFindGStreamerLibrary)
+
+macro(_find_gst_component _name _header)
+    find_gstreamer_library(${_name} ${_header} ${GSTREAMER_ABI_VERSION})
+    set(_GSTREAMER_EXTRA_VARIABLES ${_GSTREAMER_EXTRA_VARIABLES}
+                                    GSTREAMER_${_name}_LIBRARY GSTREAMER_${_name}_INCLUDE_DIR)
+endmacro()
+
+foreach(_component ${GStreamer_FIND_COMPONENTS})
+    if (${_component} STREQUAL "base")
+        _find_gst_component(BASE gstbasesink.h)
+    elseif (${_component} STREQUAL "check")
+        _find_gst_component(CHECK gstcheck.h)
+    elseif (${_component} STREQUAL "controller")
+        _find_gst_component(CONTROLLER gstcontroller.h)
+    elseif (${_component} STREQUAL "dataprotocol")
+        _find_gst_component(DATAPROTOCOL dataprotocol.h)
+    elseif (${_component} STREQUAL "net")
+        _find_gst_component(NET gstnet.h)
+    else()
+        message (AUTHOR_WARNING "FindGStreamerPluginsBase.cmake: Invalid component \"${_component}\" was specified")
+    endif()
+endforeach()
+
+
+# Version check
+if (GStreamer_FIND_VERSION)
+    if (PKG_GSTREAMER_FOUND)
+        if("${PKG_GSTREAMER_VERSION}" VERSION_LESS "${GStreamer_FIND_VERSION}")
+            message(STATUS "Found GStreamer version ${PKG_GSTREAMER_VERSION}, but at least version ${GStreamer_FIND_VERSION} is required")
+            set(GSTREAMER_VERSION_COMPATIBLE FALSE)
+        else()
+            set(GSTREAMER_VERSION_COMPATIBLE TRUE)
+        endif()
+    elseif(GSTREAMER_INCLUDE_DIR)
+        include(CheckCXXSourceCompiles)
+
+        set(CMAKE_REQUIRED_INCLUDES ${GSTREAMER_INCLUDE_DIR})
+        string(REPLACE "." "," _comma_version ${GStreamer_FIND_VERSION})
+        # Hack to invalidate the cached value
+        set(GSTREAMER_VERSION_COMPATIBLE GSTREAMER_VERSION_COMPATIBLE)
+
+        check_cxx_source_compiles("
+#define G_BEGIN_DECLS
+#define G_END_DECLS
+#include <gst/gstversion.h>
+
+#if GST_CHECK_VERSION(${_comma_version})
+int main() { return 0; }
+#else
+# error \"GStreamer version incompatible\"
+#endif
+" GSTREAMER_VERSION_COMPATIBLE)
+
+        if (NOT GSTREAMER_VERSION_COMPATIBLE)
+            message(STATUS "GStreamer ${GStreamer_FIND_VERSION} is required, but the version found is older")
+        endif()
+    else()
+        # We didn't find gstreamer at all
+        set(GSTREAMER_VERSION_COMPATIBLE FALSE)
+    endif()
+else()
+    # No version constrain was specified, thus we consider the version compatible
+    set(GSTREAMER_VERSION_COMPATIBLE TRUE)
+endif()
+
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(GStreamer DEFAULT_MSG
+                                  GSTREAMER_LIBRARY GSTREAMER_INCLUDE_DIR
+                                  GSTREAMER_VERSION_COMPATIBLE ${_GSTREAMER_EXTRA_VARIABLES})