add ffmpeg for linux/macosx

packages/f/ffmpeg/xmake.lua

@@ -0,0 +1,19 @@
+package("ffmpeg")
+
+    set_homepage("https://www.ffmpeg.org")
+    set_description("A collection of libraries to process multimedia content such as audio, video, subtitles and related metadata.")
+
+    add_urls("https://ffmpeg.org/releases/ffmpeg-$(version).tar.bz2", {alias = "home"})
+    add_urls("https://github.com/FFmpeg/FFmpeg/archive/n$(version).zip", {alias = "github"})
+    add_urls("https://git.ffmpeg.org/ffmpeg.git", "https://github.com/FFmpeg/FFmpeg.git")
+    add_versions("home:4.0.2", "346c51735f42c37e0712e0b3d2f6476c86ac15863e4445d9e823fe396420d056")
+    add_versions("github:4.0.2", "4df1ef0bf73b7148caea1270539ef7bd06607e0ea8aa2fbf1bb34062a097f026")
+
+    on_load(function (package)
+        package:addvar("links", "avfilter", "avdevice", "avformat", "avcodec", "swscale", "swresample", "avutil")
+    end)
+
+    on_install("linux", "macosx", function (package)
+        local configs = {"--disable-ffmpeg", "--disable-ffplay", "--disable-debug"}
+        import("package.tools.autoconf").install(package, configs)
+    end)