media-video/obs-studio: add support for scripting

Scripting support for Lua and Python 3 is enabled by automagic, if
the required libraries are found.  This commit adds USE-flags and
a patch that give the user control on whether or not to do so.

Closes: https://bugs.gentoo.org/656956
Package-Manager: Portage-2.3.41, Repoman-2.3.9
Closes: https://github.com/gentoo/gentoo/pull/9151
Closes: https://bugs.gentoo.org/656956

3 files changed, 193 insertions, 4 deletions

diff --git a/media-video/obs-studio/files/obs-studio-21.1.2-use-less-automagic.patch b/media-video/obs-studio/files/obs-studio-21.1.2-use-less-automagic.patch
new file mode 100644
index 000000000000..2c28c8e080d5
--- /dev/null
+++ b/media-video/obs-studio/files/obs-studio-21.1.2-use-less-automagic.patch
@@ -0,0 +1,167 @@
+From eee6541153cfb6788ee088181781793de100e54c Mon Sep 17 00:00:00 2001
+From: Jimi Huotari <chiitoo@gentoo.org>
+Date: Mon, 9 Jul 2018 02:20:10 +0300
+Subject: [PATCH 1/2] deps/obs-scripting: Use less automagic for Lua/Python
+ detection
+
+This adds build-time options for disabling the Lua and/or Python
+scripting support in cases where users do not wish to build
+it, but have the required libraries installed.
+---
+ deps/obs-scripting/CMakeLists.txt | 73 +++++++++++++++++++------------
+ 1 file changed, 45 insertions(+), 28 deletions(-)
+
+diff --git a/deps/obs-scripting/CMakeLists.txt b/deps/obs-scripting/CMakeLists.txt
+index 835c1b30..46412779 100644
+--- a/deps/obs-scripting/CMakeLists.txt
++++ b/deps/obs-scripting/CMakeLists.txt
+@@ -1,6 +1,7 @@
+ cmake_minimum_required(VERSION 2.8)
+ 
+ if(NOT ENABLE_SCRIPTING)
++	message(STATUS "Scripting plugin disabled")
+ 	return()
+ endif()
+ 
+@@ -11,44 +12,60 @@ if(MSVC)
+ 		w32-pthreads)
+ endif()
+ 
+-find_package(Luajit QUIET)
+-find_package(PythonDeps QUIET)
+-find_package(SwigDeps QUIET 2)
++option(DISABLE_LUA "Disable Lua scripting support" OFF)
++option(DISABLE_PYTHON "Disable Python scripting support" OFF)
+ 
+ set(COMPILE_PYTHON FALSE CACHE BOOL "" FORCE)
+ set(COMPILE_LUA FALSE CACHE BOOL "" FORCE)
+ 
+-if(NOT SWIG_FOUND)
+-	message(STATUS "Scripting: SWIG not found; scripting disabled")
+-	return()
+-endif()
++if(NOT DISABLE_LUA)
++	find_package(Luajit QUIET)
+ 
+-if(NOT PYTHONLIBS_FOUND AND NOT LUAJIT_FOUND)
+-	message(STATUS "Scripting: Neither Python 3 nor Luajit was found; scripting plugin disabled")
+-	return()
+-endif()
+-
+-if(NOT LUAJIT_FOUND)
+-	message(STATUS "Scripting: Luajit not found; Luajit support disabled")
++	if(NOT DISABLE_LUA AND NOT LUAJIT_FOUND)
++		message(STATUS "Luajit support not found.")
++		set(LUAJIT_FOUND FALSE)
++	else()
++		message(STATUS "Scripting: Luajit supported")
++		set(COMPILE_LUA TRUE CACHE BOOL "" FORCE)
++	endif()
+ else()
+-	message(STATUS "Scripting: Luajit supported")
+-	set(COMPILE_LUA TRUE CACHE BOOL "" FORCE)
++	message(STATUS "Scripting: Luajit support disabled")
++	set(LUAJIT_FOUND FALSE)
+ endif()
+ 
+-if(NOT PYTHONLIBS_FOUND)
+-	message(STATUS "Scripting: Python 3 not found; Python support disabled")
++if(NOT DISABLE_PYTHON)
++	find_package(PythonDeps QUIET)
++
++	if(NOT DISABLE_PYTHON AND NOT PYTHONLIBS_FOUND)
++		message(STATUS "Python support not found.")
++		set(PYTHON_FOUND FALSE)
++		set(PYTHONLIBS_FOUND FALSE)
++	else()
++		message(STATUS "Scripting: Python 3 supported")
++		set(PYTHON_FOUND TRUE)
++		set(COMPILE_PYTHON TRUE CACHE BOOL "" FORCE)
++
++		get_filename_component(PYTHON_LIB "${PYTHON_LIBRARIES}" NAME)
++		string(REGEX REPLACE "\\.[^.]*$" "" PYTHON_LIB ${PYTHON_LIB})
++
++		if(WIN32)
++			string(REGEX REPLACE "_d" "" PYTHON_LIB "${PYTHON_LIB}")
++		endif()
++	endif()
++else()
++	message(STATUS "Scripting: Python 3 support disabled")
+ 	set(PYTHON_FOUND FALSE)
+ 	set(PYTHONLIBS_FOUND FALSE)
+-else()
+-	message(STATUS "Scripting: Python 3 supported")
+-	set(PYTHON_FOUND TRUE)
+-	set(COMPILE_PYTHON TRUE CACHE BOOL "" FORCE)
+-
+-	get_filename_component(PYTHON_LIB "${PYTHON_LIBRARIES}" NAME)
+-	string(REGEX REPLACE "\\.[^.]*$" "" PYTHON_LIB ${PYTHON_LIB})
+-	if(WIN32)
+-		string(REGEX REPLACE "_d" "" PYTHON_LIB "${PYTHON_LIB}")
+-	endif()
++endif()
++
++find_package(SwigDeps QUIET 2)
++
++if(NOT SWIG_FOUND)
++	message(STATUS "Scripting: SWIG not found; scripting disabled")
++endif()
++
++if(NOT PYTHONLIBS_FOUND AND NOT LUAJIT_FOUND)
++	message(STATUS "Scripting: Neither Python 3 nor Luajit was found; scripting plugin disabled")
+ endif()
+ 
+ set(SCRIPTING_ENABLED ON CACHE BOOL "Interal global cmake variable" FORCE)
+-- 
+2.18.0
+
+From 79006adaf2b93ed4ddc07ff236a9ed1fcd09e47f Mon Sep 17 00:00:00 2001
+From: Jimi Huotari <chiitoo@gentoo.org>
+Date: Wed, 11 Jul 2018 02:08:51 +0300
+Subject: [PATCH 2/2] obs-filters: Use less automagic for SpeexDSP detection
+
+This adds a build-time option for disabling the SpeexDSP-based
+Noise Suppression filter support in cases where users do not
+wish to build it, but have the required library installed.
+---
+ plugins/obs-filters/CMakeLists.txt | 24 +++++++++++++++++-------
+ 1 file changed, 17 insertions(+), 7 deletions(-)
+
+diff --git a/plugins/obs-filters/CMakeLists.txt b/plugins/obs-filters/CMakeLists.txt
+index ec4289cc..4d862b0a 100644
+--- a/plugins/obs-filters/CMakeLists.txt
++++ b/plugins/obs-filters/CMakeLists.txt
+@@ -1,13 +1,23 @@
+ project(obs-filters)
+ 
+-find_package(Libspeexdsp QUIET)
+-if(LIBSPEEXDSP_FOUND)
+-	set(obs-filters_LIBSPEEXDSP_SOURCES
+-		noise-suppress-filter.c)
+-	set(obs-filters_LIBSPEEXDSP_LIBRARIES
+-		${LIBSPEEXDSP_LIBRARIES})
++option(DISABLE_SPEEXDSP "Disable building of the SpeexDSP-based Noise Suppression filter" OFF)
++
++if(DISABLE_SPEEXDSP)
++	message(STATUS "SpeexDSP support disabled")
++	set(LIBSPEEXDSP_FOUND FALSE)
+ else()
+-	message(STATUS "Speexdsp library not found, speexdsp filters disabled")
++	find_package(Libspeexdsp QUIET)
++
++	if(NOT LIBSPEEXDSP_FOUND)
++		message(STATUS "SpeexDSP support not found")
++		set(LIBSPEEXDSP_FOUND FALSE)
++	else()
++		message(STATUS "SpeexDSP supported")
++		set(obs-filters_LIBSPEEXDSP_SOURCES
++			noise-suppress-filter.c)
++		set(obs-filters_LIBSPEEXDSP_LIBRARIES
++			${LIBSPEEXDSP_LIBRARIES})
++	endif()
+ endif()
+ 
+ configure_file("${CMAKE_CURRENT_SOURCE_DIR}/obs-filters-config.h.in"
+-- 
+2.18.0
+
diff --git a/media-video/obs-studio/metadata.xml b/media-video/obs-studio/metadata.xml
index 27ed2bccb4cb..20792bdd8baa 100644
--- a/media-video/obs-studio/metadata.xml
+++ b/media-video/obs-studio/metadata.xml
@@ -14,7 +14,9 @@
   <use>
     <flag name="fdk">Enable libfdk support for AAC encoding.</flag>
     <flag name="imagemagick">Use ImageMagick for image loading instead of FFmpeg.</flag>
-    <flag name="nvenc">Enable NVENC encoding for nVidia video cards</flag>
+    <flag name="luajit">Build support for scripting via Luajit.</flag>
+    <flag name="nvenc">Enable NVENC encoding for nVidia video cards.</flag>
+    <flag name="python">Build support for scripting via Python 3.</flag>
   </use>
   <upstream>
     <remote-id type="github">jp9000/obs-studio</remote-id>
diff --git a/media-video/obs-studio/obs-studio-9999.ebuild b/media-video/obs-studio/obs-studio-9999.ebuild
index e030ae7b1d73..b1dee2913b2b 100644
--- a/media-video/obs-studio/obs-studio-9999.ebuild
+++ b/media-video/obs-studio/obs-studio-9999.ebuild
@@ -3,9 +3,10 @@
 
 EAPI=6
 
+PYTHON_COMPAT=( python{3_4,3_5,3_6} )
 CMAKE_MIN_VERSION=3.9.6
 
-inherit cmake-utils gnome2-utils
+inherit cmake-utils gnome2-utils python-any-r1
 
 if [[ ${PV} == *9999 ]]; then
 	inherit git-r3
@@ -21,7 +22,7 @@ HOMEPAGE="https://obsproject.com"
 
 LICENSE="GPL-2"
 SLOT="0"
-IUSE="+alsa fdk imagemagick jack pulseaudio truetype v4l"
+IUSE="+alsa fdk imagemagick jack luajit nvenc pulseaudio python truetype v4l"
 
 COMMON_DEPEND="
 	>=dev-libs/jansson-2.5
@@ -44,16 +45,24 @@ COMMON_DEPEND="
 	fdk? ( media-libs/fdk-aac:= )
 	imagemagick? ( media-gfx/imagemagick:= )
 	jack? ( virtual/jack )
+	luajit? ( dev-lang/luajit:2 )
+	nvenc? ( media-video/ffmpeg:=[nvenc] )
 	pulseaudio? ( media-sound/pulseaudio )
+	python? ( ${PYTHON_DEPS} )
 	truetype? (
 		media-libs/fontconfig
 		media-libs/freetype
 	)
 	v4l? ( media-libs/libv4l )
 "
-DEPEND="${COMMON_DEPEND}"
+DEPEND="${COMMON_DEPEND}
+	luajit? ( dev-lang/swig )
+	python? ( dev-lang/swig )
+"
 RDEPEND="${COMMON_DEPEND}"
 
+PATCHES="${FILESDIR}/${PN}-21.1.2-use-less-automagic.patch"
+
 CMAKE_REMOVE_MODULES_LIST=( FindFreetype )
 
 src_configure() {
@@ -69,6 +78,17 @@ src_configure() {
 		-DOBS_MULTIARCH_SUFFIX=${libdir#lib}
 		-DUNIX_STRUCTURE=1
 	)
+
+	if use luajit || use python; then
+		mycmakeargs+=(
+			-DDISABLE_LUA=$(usex !luajit)
+			-DDISABLE_PYTHON=$(usex !python)
+			-DENABLE_SCRIPTING=yes
+		)
+	else
+		mycmakeargs+=( -DENABLE_SCRIPTING=no )
+	fi
+
 	cmake-utils_src_configure
 }