Source/cmake/FindGStreamer.cmake - WebKit - 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-gl:         GSTREAMER_GL_INCLUDE_DIRS and GSTREAMER_GL_LIBRARIES
 #  gstreamer-mpegts:     GSTREAMER_MPEGTS_INCLUDE_DIRS and GSTREAMER_MPEGTS_LIBRARIES
 #  gstreamer-pbutils:    GSTREAMER_PBUTILS_INCLUDE_DIRS and GSTREAMER_PBUTILS_LIBRARIES
 #  gstreamer-tag:        GSTREAMER_TAG_INCLUDE_DIRS and GSTREAMER_TAG_LIBRARIES
 #  gstreamer-video:      GSTREAMER_VIDEO_INCLUDE_DIRS and GSTREAMER_VIDEO_LIBRARIES
 #  gstreamer-codecparser:GSTREAMER_CODECPARSERS_INCLUDE_DIRS and GSTREAMER_CODECPARSERS_LIBRARIES
 #  gstreamer-full:       GSTREAMER_FULL_INCLUDE_DIRS and GSTREAMER_FULL_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 QUIET)

 # 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-1.0", or "gstreamer-video-1.0").
 #   _library is the component's library name (eg. "gstreamer-1.0" or "gstvideo-1.0")
 macro(FIND_GSTREAMER_COMPONENT _component_prefix _pkgconfig_name _library)

     string(REGEX MATCH "(.*)>=(.*)" _dummy "${_pkgconfig_name}")
     if ("${CMAKE_MATCH_2}" STREQUAL "")
         pkg_check_modules(PC_${_component_prefix} "${_pkgconfig_name} >= ${GStreamer_FIND_VERSION}")
     else ()
         pkg_check_modules(PC_${_component_prefix} ${_pkgconfig_name})
     endif ()

     # The gst .pc files might have their `includedir` not specify the
     # gstreamer-1.0 suffix. In that case the `Cflags` contain
     # ${includedir}/gstreamer-1.0 which remains correct. The issue here is that
     # we don't rely on the `Cflags`, cmake fails to generate a proper
     # `.._INCLUDE_DIRS` variable in this case. So we need to do it here...
     set(_include_dir "${PC_${_component_prefix}_INCLUDEDIR}")
     string(REGEX MATCH "(.*)/gstreamer-1.0" _dummy "${_include_dir}")
     if ("${CMAKE_MATCH_1}" STREQUAL "")
         set(${_component_prefix}_INCLUDE_DIRS "${_include_dir}/gstreamer-1.0;${PC_${_component_prefix}_INCLUDE_DIRS}")
     else ()
         set(${_component_prefix}_INCLUDE_DIRS "${PC_${_component_prefix}_INCLUDE_DIRS}")
     endif ()

     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-1.0 gstreamer-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_BASE gstreamer-base-1.0 gstbase-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_FULL gstreamer-full-1.0>=1.17.0 gstreamer-full-1.0)

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

 FIND_GSTREAMER_COMPONENT(GSTREAMER_APP gstreamer-app-1.0 gstapp-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_AUDIO gstreamer-audio-1.0 gstaudio-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_FFT gstreamer-fft-1.0 gstfft-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_GL gstreamer-gl-1.0 gstgl-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_MPEGTS gstreamer-mpegts-1.0>=1.4.0 gstmpegts-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_PBUTILS gstreamer-pbutils-1.0 gstpbutils-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_TAG gstreamer-tag-1.0 gsttag-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_VIDEO gstreamer-video-1.0 gstvideo-1.0)
 FIND_GSTREAMER_COMPONENT(GSTREAMER_CODECPARSERS gstreamer-codecparsers-1.0 gstcodecparsers-1.0)

 # ------------------------------------------------
 # 3. Process the COMPONENTS passed to FIND_PACKAGE
 # ------------------------------------------------
 set(_GSTREAMER_REQUIRED_VARS GSTREAMER_INCLUDE_DIRS GSTREAMER_LIBRARIES GSTREAMER_VERSION 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 REQUIRED_VARS _GSTREAMER_REQUIRED_VARS
                                             VERSION_VAR   GSTREAMER_VERSION)

 mark_as_advanced(
     GSTREAMER_APP_INCLUDE_DIRS
     GSTREAMER_APP_LIBRARIES
     GSTREAMER_AUDIO_INCLUDE_DIRS
     GSTREAMER_AUDIO_LIBRARIES
     GSTREAMER_BASE_INCLUDE_DIRS
     GSTREAMER_BASE_LIBRARIES
     GSTREAMER_FFT_INCLUDE_DIRS
     GSTREAMER_FFT_LIBRARIES
     GSTREAMER_GL_INCLUDE_DIRS
     GSTREAMER_GL_LIBRARIES
     GSTREAMER_INCLUDE_DIRS
     GSTREAMER_LIBRARIES
     GSTREAMER_MPEGTS_INCLUDE_DIRS
     GSTREAMER_MPEGTS_LIBRARIES
     GSTREAMER_PBUTILS_INCLUDE_DIRS
     GSTREAMER_PBUTILS_LIBRARIES
     GSTREAMER_TAG_INCLUDE_DIRS
     GSTREAMER_TAG_LIBRARIES
     GSTREAMER_VIDEO_INCLUDE_DIRS
     GSTREAMER_VIDEO_LIBRARIES
     GSTREAMER_CODECPARSERS_INCLUDE_DIRS
     GSTREAMER_CODECPARSERS_LIBRARIES
     GSTREAMER_FULL_INCLUDE_DIRS
     GSTREAMER_FULL_LIBRARIES
 )
	# - 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-gl: GSTREAMER_GL_INCLUDE_DIRS and GSTREAMER_GL_LIBRARIES
	# gstreamer-mpegts: GSTREAMER_MPEGTS_INCLUDE_DIRS and GSTREAMER_MPEGTS_LIBRARIES
	# gstreamer-pbutils: GSTREAMER_PBUTILS_INCLUDE_DIRS and GSTREAMER_PBUTILS_LIBRARIES
	# gstreamer-tag: GSTREAMER_TAG_INCLUDE_DIRS and GSTREAMER_TAG_LIBRARIES
	# gstreamer-video: GSTREAMER_VIDEO_INCLUDE_DIRS and GSTREAMER_VIDEO_LIBRARIES
	# gstreamer-codecparser:GSTREAMER_CODECPARSERS_INCLUDE_DIRS and GSTREAMER_CODECPARSERS_LIBRARIES
	# gstreamer-full: GSTREAMER_FULL_INCLUDE_DIRS and GSTREAMER_FULL_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 QUIET)

	# 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-1.0", or "gstreamer-video-1.0").
	# _library is the component's library name (eg. "gstreamer-1.0" or "gstvideo-1.0")
	macro(FIND_GSTREAMER_COMPONENT _component_prefix _pkgconfig_name _library)

	string(REGEX MATCH "(.)>=(.)" _dummy "${_pkgconfig_name}")
	if ("${CMAKE_MATCH_2}" STREQUAL "")
	pkg_check_modules(PC_${_component_prefix} "${_pkgconfig_name} >= ${GStreamer_FIND_VERSION}")
	else ()
	pkg_check_modules(PC_${_component_prefix} ${_pkgconfig_name})
	endif ()

	# The gst .pc files might have their `includedir` not specify the
	# gstreamer-1.0 suffix. In that case the `Cflags` contain
	# ${includedir}/gstreamer-1.0 which remains correct. The issue here is that
	# we don't rely on the `Cflags`, cmake fails to generate a proper
	# `.._INCLUDE_DIRS` variable in this case. So we need to do it here...
	set(_include_dir "${PC_${_component_prefix}_INCLUDEDIR}")
	string(REGEX MATCH "(.*)/gstreamer-1.0" _dummy "${_include_dir}")
	if ("${CMAKE_MATCH_1}" STREQUAL "")
	set(${_component_prefix}_INCLUDE_DIRS "${_include_dir}/gstreamer-1.0;${PC_${_component_prefix}_INCLUDE_DIRS}")
	else ()
	set(${_component_prefix}_INCLUDE_DIRS "${PC_${_component_prefix}_INCLUDE_DIRS}")
	endif ()

	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-1.0 gstreamer-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_BASE gstreamer-base-1.0 gstbase-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_FULL gstreamer-full-1.0>=1.17.0 gstreamer-full-1.0)

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

	FIND_GSTREAMER_COMPONENT(GSTREAMER_APP gstreamer-app-1.0 gstapp-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_AUDIO gstreamer-audio-1.0 gstaudio-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_FFT gstreamer-fft-1.0 gstfft-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_GL gstreamer-gl-1.0 gstgl-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_MPEGTS gstreamer-mpegts-1.0>=1.4.0 gstmpegts-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_PBUTILS gstreamer-pbutils-1.0 gstpbutils-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_TAG gstreamer-tag-1.0 gsttag-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_VIDEO gstreamer-video-1.0 gstvideo-1.0)
	FIND_GSTREAMER_COMPONENT(GSTREAMER_CODECPARSERS gstreamer-codecparsers-1.0 gstcodecparsers-1.0)

	# ------------------------------------------------
	# 3. Process the COMPONENTS passed to FIND_PACKAGE
	# ------------------------------------------------
	set(_GSTREAMER_REQUIRED_VARS GSTREAMER_INCLUDE_DIRS GSTREAMER_LIBRARIES GSTREAMER_VERSION 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 REQUIRED_VARS _GSTREAMER_REQUIRED_VARS
	VERSION_VAR GSTREAMER_VERSION)

	mark_as_advanced(
	GSTREAMER_APP_INCLUDE_DIRS
	GSTREAMER_APP_LIBRARIES
	GSTREAMER_AUDIO_INCLUDE_DIRS
	GSTREAMER_AUDIO_LIBRARIES
	GSTREAMER_BASE_INCLUDE_DIRS
	GSTREAMER_BASE_LIBRARIES
	GSTREAMER_FFT_INCLUDE_DIRS
	GSTREAMER_FFT_LIBRARIES
	GSTREAMER_GL_INCLUDE_DIRS
	GSTREAMER_GL_LIBRARIES
	GSTREAMER_INCLUDE_DIRS
	GSTREAMER_LIBRARIES
	GSTREAMER_MPEGTS_INCLUDE_DIRS
	GSTREAMER_MPEGTS_LIBRARIES
	GSTREAMER_PBUTILS_INCLUDE_DIRS
	GSTREAMER_PBUTILS_LIBRARIES
	GSTREAMER_TAG_INCLUDE_DIRS
	GSTREAMER_TAG_LIBRARIES
	GSTREAMER_VIDEO_INCLUDE_DIRS
	GSTREAMER_VIDEO_LIBRARIES
	GSTREAMER_CODECPARSERS_INCLUDE_DIRS
	GSTREAMER_CODECPARSERS_LIBRARIES
	GSTREAMER_FULL_INCLUDE_DIRS
	GSTREAMER_FULL_LIBRARIES
	)