Enable decklink (#27)

Formula/ffmpeg.rb

@@ -10,6 +10,7 @@ class Ffmpeg < Formula
   bottle :unneeded
 
   option "with-chromaprint", "Enable the Chromaprint audio fingerprinting library"
+  option "with-decklink", "Enable DeckLink support"
   option "with-fdk-aac", "Enable the Fraunhofer FDK AAC library"
   option "with-librsvg", "Enable SVG files as inputs via librsvg"
   option "with-libsoxr", "Enable the soxr resample library"
@@ -145,7 +146,16 @@ def install
     args << "--enable-libzmq" if build.with? "zeromq"
     args << "--enable-openssl" if build.with? "openssl"
 
-    # packages that need additional license options
+    # These librares are GPL-incompatible, and require ffmpeg be built with
+    # the "--enable-nonfree" flag, which produces unredistributable libraries
+    args << "--enable-nonfree" if build.with?("decklink") || build.with?("fdk-aac") || build.with?("openssl")
+
+    if build.with? "decklink"
+      args << "--enable-decklink"
+      args << "--extra-cflags=-I#{HOMEBREW_PREFIX}/include"
+      args << "--extra-ldflags=-L#{HOMEBREW_PREFIX}/include"
+    end
+
     if build.with?("opencore-amr") || build.with?("libvmaf")
       args << "--enable-version3"
     end
@@ -161,10 +171,6 @@ def install
       args << "--extra-cflags=" + `pkg-config --cflags libopenjp2`.chomp
     end
 
-    # These librares are GPL-incompatible, and require ffmpeg be built with
-    # the "--enable-nonfree" flag, which produces unredistributable libraries
-    args << "--enable-nonfree" if build.with?("fdk-aac") || build.with?("openssl")
-
     system "./configure", *args
     system "make", "install"
 

README.md

@@ -93,6 +93,7 @@ This formula features the following libraries:
 | `x265` | ✔ | x265 HEVC encoder |
 | `xz` | ✔ | XZ compression support |
 | `chromaprint` | | Chromaprint audio fingerprinting library |
+| `decklink` | | Enable DeckLink support |
 | `fdk-aac` | | Fraunhofer FDK AAC library |
 | `game-music-emu` | | game-music-emu support |
 | `libbluray` | | libbluray support |