Source/cmake/FindGStreamer.cmake - external/WebKit_submodule - Git at Google

 # - Try to find GStreamer and its plugins
 # Once done, this will define
 #
 #  GSTREAMER_FOUND - system has GStreamer
 #  GSTREAMER_INCLUDE_DIRS - the GStreamer include directories
 #  GSTREAMER_LIBRARIES - link these to use GStreamer
 #
 # Additionally, gstreamer-base is always looked for and required, and
 # the following related variables are defined:
 #
 #  GSTREAMER_BASE_INCLUDE_DIRS - gstreamer-base's include directory
 #  GSTREAMER_BASE_LIBRARIES - link to these to use gstreamer-base
 #
 # Optionally, the COMPONENTS keyword can be passed to FIND_PACKAGE()
 # and GStreamer plugins can be looked for.  Currently, the following
 # plugins can be searched, and they define the following variables if
 # found:
 #
 #  gstreamer-app:        GSTREAMER_APP_INCLUDE_DIRS and GSTREAMER_APP_LIBRARIES
 #  gstreamer-audio:      GSTREAMER_AUDIO_INCLUDE_DIRS and GSTREAMER_AUDIO_LIBRARIES
 #  gstreamer-fft:        GSTREAMER_FFT_INCLUDE_DIRS and GSTREAMER_FFT_LIBRARIES
 #  gstreamer-interfaces: GSTREAMER_INTERFACES_INCLUDE_DIRS and GSTREAMER_INTERFACES_LIBRARIES
 #  gstreamer-pbutils:    GSTREAMER_PBUTILS_INCLUDE_DIRS and GSTREAMER_PBUTILS_LIBRARIES
 #  gstreamer-video:      GSTREAMER_VIDEO_INCLUDE_DIRS and GSTREAMER_VIDEO_LIBRARIES
 #
 # Copyright (C) 2012 Raphael Kubo da Costa <rakuco@webkit.org>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 # 1.  Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
 # 2.  Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in the
 #     documentation and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND ITS CONTRIBUTORS ``AS
 # IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR ITS
 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 # OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 # OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 # ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 FIND_PACKAGE(PkgConfig)

 # The minimum GStreamer version we support.
 SET(GSTREAMER_MINIMUM_VERSION 0.10.30)

 # Helper macro to find a GStreamer plugin (or GStreamer itself)
 #   _component_prefix is prepended to the _INCLUDE_DIRS and _LIBRARIES variables (eg. "GSTREAMER_AUDIO")
 #   _pkgconfig_name is the component's pkg-config name (eg. "gstreamer-0.10", or "gstreamer-video-0.10").
 #   _header is the component's header, relative to the gstreamer-0.10 directory (eg. "gst/gst.h").
 #   _library is the component's library name (eg. "gstreamer-0.10" or "gstvideo-0.10")
 MACRO(FIND_GSTREAMER_COMPONENT _component_prefix _pkgconfig_name _header _library)
     # FIXME: The QUIET keyword can be used once we require CMake 2.8.2.
     PKG_CHECK_MODULES(PC_${_component_prefix} ${_pkgconfig_name})

     FIND_PATH(${_component_prefix}_INCLUDE_DIRS
         NAMES ${_header}
         HINTS ${PC_${_component_prefix}_INCLUDE_DIRS} ${PC_${_component_prefix}_INCLUDEDIR}
         PATH_SUFFIXES gstreamer-0.10
     )

     FIND_LIBRARY(${_component_prefix}_LIBRARIES
         NAMES ${_library}
         HINTS ${PC_${_component_prefix}_LIBRARY_DIRS} ${PC_${_component_prefix}_LIBDIR}
     )
 ENDMACRO()

 # ------------------------
 # 1. Find GStreamer itself
 # ------------------------

 # 1.1. Find headers and libraries
 FIND_GSTREAMER_COMPONENT(GSTREAMER gstreamer-0.10 gst/gst.h gstreamer-0.10)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_BASE gstreamer-base-0.10 gst/gst.h gstbase-0.10)

 # 1.2. Check GStreamer version
 IF (GSTREAMER_INCLUDE_DIRS)
     IF (EXISTS "${GSTREAMER_INCLUDE_DIRS}/gst/gstversion.h")
         FILE (READ "${GSTREAMER_INCLUDE_DIRS}/gst/gstversion.h" GSTREAMER_VERSION_CONTENTS)

         STRING(REGEX MATCH "#define +GST_VERSION_MAJOR +\\(([0-9]+)\\)" _dummy "${GSTREAMER_VERSION_CONTENTS}")
         SET(GSTREAMER_VERSION_MAJOR "${CMAKE_MATCH_1}")

         STRING(REGEX MATCH "#define +GST_VERSION_MINOR +\\(([0-9]+)\\)" _dummy "${GSTREAMER_VERSION_CONTENTS}")
         SET(GSTREAMER_VERSION_MINOR "${CMAKE_MATCH_1}")

         STRING(REGEX MATCH "#define +GST_VERSION_MICRO +\\(([0-9]+)\\)" _dummy "${GSTREAMER_VERSION_CONTENTS}")
         SET(GSTREAMER_VERSION_MICRO "${CMAKE_MATCH_1}")

         SET(GSTREAMER_VERSION "${GSTREAMER_VERSION_MAJOR}.${GSTREAMER_VERSION_MINOR}.${GSTREAMER_VERSION_MICRO}")
     ENDIF ()
 ENDIF ()

 # FIXME: With CMake 2.8.3 we can just pass GSTREAMER_VERSION to FIND_PACKAGE_HANDLE_STARNDARD_ARGS as VERSION_VAR
 #        and remove the version check here (GSTREAMER_MINIMUM_VERSION would be passed to FIND_PACKAGE).
 SET(VERSION_OK TRUE)
 IF ("${GSTREAMER_VERSION}" VERSION_LESS "${GSTREAMER_MINIMUM_VERSION}")
     SET(VERSION_OK FALSE)
 ENDIF ()

 # -------------------------
 # 2. Find GStreamer plugins
 # -------------------------

 FIND_GSTREAMER_COMPONENT(GSTREAMER_APP gstreamer-app-0.10 gst/app/gstappsink.h gstapp-0.10)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_AUDIO gstreamer-audio-0.10 gst/audio/audio.h gstaudio-0.10)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_FFT gstreamer-fft-0.10 gst/fft/gstfft.h gstfft-0.10)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_INTERFACES gstreamer-interfaces-0.10 gst/interfaces/mixer.h gstinterfaces-0.10)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_PBUTILS gstreamer-pbutils-0.10 gst/pbutils/pbutils.h gstpbutils-0.10)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_VIDEO gstreamer-video-0.10 gst/video/video.h gstvideo-0.10)

 # ------------------------------------------------
 # 3. Process the COMPONENTS passed to FIND_PACKAGE
 # ------------------------------------------------
 SET(_GSTREAMER_REQUIRED_VARS GSTREAMER_INCLUDE_DIRS GSTREAMER_LIBRARIES VERSION_OK GSTREAMER_BASE_INCLUDE_DIRS GSTREAMER_BASE_LIBRARIES)

 FOREACH(_component ${GStreamer_FIND_COMPONENTS})
     SET(_gst_component "GSTREAMER_${_component}")
     STRING(TOUPPER ${_gst_component} _UPPER_NAME)

     LIST(APPEND _GSTREAMER_REQUIRED_VARS ${_UPPER_NAME}_INCLUDE_DIRS ${_UPPER_NAME}_LIBRARIES)
 ENDFOREACH()

 INCLUDE(FindPackageHandleStandardArgs)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(GStreamer DEFAULT_MSG ${_GSTREAMER_REQUIRED_VARS})
	# - Try to find GStreamer and its plugins
	# Once done, this will define
	#
	# GSTREAMER_FOUND - system has GStreamer
	# GSTREAMER_INCLUDE_DIRS - the GStreamer include directories
	# GSTREAMER_LIBRARIES - link these to use GStreamer
	#
	# Additionally, gstreamer-base is always looked for and required, and
	# the following related variables are defined:
	#
	# GSTREAMER_BASE_INCLUDE_DIRS - gstreamer-base's include directory
	# GSTREAMER_BASE_LIBRARIES - link to these to use gstreamer-base
	#
	# Optionally, the COMPONENTS keyword can be passed to FIND_PACKAGE()
	# and GStreamer plugins can be looked for. Currently, the following
	# plugins can be searched, and they define the following variables if
	# found:
	#
	# gstreamer-app: GSTREAMER_APP_INCLUDE_DIRS and GSTREAMER_APP_LIBRARIES
	# gstreamer-audio: GSTREAMER_AUDIO_INCLUDE_DIRS and GSTREAMER_AUDIO_LIBRARIES
	# gstreamer-fft: GSTREAMER_FFT_INCLUDE_DIRS and GSTREAMER_FFT_LIBRARIES
	# gstreamer-interfaces: GSTREAMER_INTERFACES_INCLUDE_DIRS and GSTREAMER_INTERFACES_LIBRARIES
	# gstreamer-pbutils: GSTREAMER_PBUTILS_INCLUDE_DIRS and GSTREAMER_PBUTILS_LIBRARIES
	# gstreamer-video: GSTREAMER_VIDEO_INCLUDE_DIRS and GSTREAMER_VIDEO_LIBRARIES
	#
	# Copyright (C) 2012 Raphael Kubo da Costa <rakuco@webkit.org>
	#
	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions
	# are met:
	# 1. Redistributions of source code must retain the above copyright
	# notice, this list of conditions and the following disclaimer.
	# 2. Redistributions in binary form must reproduce the above copyright
	# notice, this list of conditions and the following disclaimer in the
	# documentation and/or other materials provided with the distribution.
	#
	# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND ITS CONTRIBUTORS ``AS
	# IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR ITS
	# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
	# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
	# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
	# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
	# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	FIND_PACKAGE(PkgConfig)

	# The minimum GStreamer version we support.
	SET(GSTREAMER_MINIMUM_VERSION 0.10.30)

	# Helper macro to find a GStreamer plugin (or GStreamer itself)
	# _component_prefix is prepended to the _INCLUDE_DIRS and _LIBRARIES variables (eg. "GSTREAMER_AUDIO")
	# _pkgconfig_name is the component's pkg-config name (eg. "gstreamer-0.10", or "gstreamer-video-0.10").
	# _header is the component's header, relative to the gstreamer-0.10 directory (eg. "gst/gst.h").
	# _library is the component's library name (eg. "gstreamer-0.10" or "gstvideo-0.10")
	MACRO(FIND_GSTREAMER_COMPONENT _component_prefix _pkgconfig_name _header _library)
	# FIXME: The QUIET keyword can be used once we require CMake 2.8.2.
	PKG_CHECK_MODULES(PC_${_component_prefix} ${_pkgconfig_name})

	FIND_PATH(${_component_prefix}_INCLUDE_DIRS
	NAMES ${_header}
	HINTS ${PC_${_component_prefix}_INCLUDE_DIRS} ${PC_${_component_prefix}_INCLUDEDIR}
	PATH_SUFFIXES gstreamer-0.10
	)

	FIND_LIBRARY(${_component_prefix}_LIBRARIES
	NAMES ${_library}
	HINTS ${PC_${_component_prefix}_LIBRARY_DIRS} ${PC_${_component_prefix}_LIBDIR}
	)
	ENDMACRO()

	# ------------------------
	# 1. Find GStreamer itself
	# ------------------------

	# 1.1. Find headers and libraries
	FIND_GSTREAMER_COMPONENT(GSTREAMER gstreamer-0.10 gst/gst.h gstreamer-0.10)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_BASE gstreamer-base-0.10 gst/gst.h gstbase-0.10)

	# 1.2. Check GStreamer version
	IF (GSTREAMER_INCLUDE_DIRS)
	IF (EXISTS "${GSTREAMER_INCLUDE_DIRS}/gst/gstversion.h")
	FILE (READ "${GSTREAMER_INCLUDE_DIRS}/gst/gstversion.h" GSTREAMER_VERSION_CONTENTS)

	STRING(REGEX MATCH "#define +GST_VERSION_MAJOR +\\(([0-9]+)\\)" _dummy "${GSTREAMER_VERSION_CONTENTS}")
	SET(GSTREAMER_VERSION_MAJOR "${CMAKE_MATCH_1}")

	STRING(REGEX MATCH "#define +GST_VERSION_MINOR +\\(([0-9]+)\\)" _dummy "${GSTREAMER_VERSION_CONTENTS}")
	SET(GSTREAMER_VERSION_MINOR "${CMAKE_MATCH_1}")

	STRING(REGEX MATCH "#define +GST_VERSION_MICRO +\\(([0-9]+)\\)" _dummy "${GSTREAMER_VERSION_CONTENTS}")
	SET(GSTREAMER_VERSION_MICRO "${CMAKE_MATCH_1}")

	SET(GSTREAMER_VERSION "${GSTREAMER_VERSION_MAJOR}.${GSTREAMER_VERSION_MINOR}.${GSTREAMER_VERSION_MICRO}")
	ENDIF ()
	ENDIF ()

	# FIXME: With CMake 2.8.3 we can just pass GSTREAMER_VERSION to FIND_PACKAGE_HANDLE_STARNDARD_ARGS as VERSION_VAR
	# and remove the version check here (GSTREAMER_MINIMUM_VERSION would be passed to FIND_PACKAGE).
	SET(VERSION_OK TRUE)
	IF ("${GSTREAMER_VERSION}" VERSION_LESS "${GSTREAMER_MINIMUM_VERSION}")
	SET(VERSION_OK FALSE)
	ENDIF ()

	# -------------------------
	# 2. Find GStreamer plugins
	# -------------------------

	FIND_GSTREAMER_COMPONENT(GSTREAMER_APP gstreamer-app-0.10 gst/app/gstappsink.h gstapp-0.10)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_AUDIO gstreamer-audio-0.10 gst/audio/audio.h gstaudio-0.10)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_FFT gstreamer-fft-0.10 gst/fft/gstfft.h gstfft-0.10)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_INTERFACES gstreamer-interfaces-0.10 gst/interfaces/mixer.h gstinterfaces-0.10)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_PBUTILS gstreamer-pbutils-0.10 gst/pbutils/pbutils.h gstpbutils-0.10)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_VIDEO gstreamer-video-0.10 gst/video/video.h gstvideo-0.10)

	# ------------------------------------------------
	# 3. Process the COMPONENTS passed to FIND_PACKAGE
	# ------------------------------------------------
	SET(_GSTREAMER_REQUIRED_VARS GSTREAMER_INCLUDE_DIRS GSTREAMER_LIBRARIES VERSION_OK GSTREAMER_BASE_INCLUDE_DIRS GSTREAMER_BASE_LIBRARIES)

	FOREACH(_component ${GStreamer_FIND_COMPONENTS})
	SET(_gst_component "GSTREAMER_${_component}")
	STRING(TOUPPER ${_gst_component} _UPPER_NAME)

	LIST(APPEND _GSTREAMER_REQUIRED_VARS ${_UPPER_NAME}_INCLUDE_DIRS ${_UPPER_NAME}_LIBRARIES)
	ENDFOREACH()

	INCLUDE(FindPackageHandleStandardArgs)
	FIND_PACKAGE_HANDLE_STANDARD_ARGS(GStreamer DEFAULT_MSG ${_GSTREAMER_REQUIRED_VARS})