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# - 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})
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