enable harfbuzz (homebrew-ffmpeg#150)

* enable harfbuzz

* update ReadMe

Formula/ffmpeg.rb

@@ -5,14 +5,15 @@ class Ffmpeg < Formula
   version "6.1-with-options" # to distinguish from homebrew-core's ffmpeg
   sha256 "488c76e57dd9b3bee901f71d5c95eaf1db4a5a31fe46a28654e837144207c270"
   license "GPL-2.0-or-later"
-  revision 2
+  revision 3
   head "https://github.com/FFmpeg/FFmpeg.git", branch: "master"
 
   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-libflite", "Enable text to speech synthesis support via Flite"
   option "with-game-music-emu", "Enable Game Music Emu (GME) support"
+  option "with-harfbuzz", "Enable OpenType text shaping engine"
   option "with-jack", "Enable Jack support"
   option "with-jpeg-xl", "Enable JPEG XL image format"
   option "with-libaribb24", "Enable decoding ARIB/ISDB captions"
@@ -67,6 +68,7 @@ class Ffmpeg < Formula
   depends_on "chromaprint" => :optional
   depends_on "fdk-aac" => :optional
   depends_on "game-music-emu" => :optional
+  depends_on "harfbuzz" => :optional
   depends_on "jack" => :optional
   depends_on "jpeg-xl" => :optional
   depends_on "libaribcaption" => :optional
@@ -168,6 +170,7 @@ def install
     args << "--enable-libflite" if build.with? "libflite"
     args << "--enable-libgme" if build.with? "game-music-emu"
     args << "--enable-libgsm" if build.with? "libgsm"
+    args << "--enable-libharfbuzz" if build.with? "harfbuzz"
     args << "--enable-libjxl" if build.with? "jpeg-xl"
     args << "--enable-libmodplug" if build.with? "libmodplug"
     args << "--enable-libopenh264" if build.with? "openh264"

README.md

@@ -105,6 +105,7 @@ This formula features the following libraries optionally:
 | `decklink`       | Enable DeckLink support                                          | The DeckLink SDK has to be installed **before** running the FFmpeg formula. One possibility is to use:<br>```brew install amiaopensource/amiaos/decklinksdk```<br><br>In addition, if you experience difficulties on macOS, make sure you follow [these directions](https://forum.blackmagicdesign.com/viewtopic.php?f=4&t=121992#p699837). |
 | `fdk-aac`        | Fraunhofer FDK AAC library                                       |
 | `game-music-emu` | Enable Game Music Emu (GME) support                              |
+| `harfbuzz`       | Enable OpenType text shaping engine (libharfbuzz)                |
 | `jack`           | Jack audio device support                                        |
 | `jpeg-xl`        | JPEG XL support                                                  |
 | `libaribcaption` | Enable handling of ARIB STD-B24 based broadcast captions         |