ffmpeg: support drawtext avfilter (#27379)

freetype and harbuzz (6.1+) are required options for the drawtext
avfilter.

fontconfig is optional and allows font fallback and
font configuration. fribidi is optional but can improve
rendering.

https://ffmpeg.org/ffmpeg-filters.html#drawtext-1

all are disabled by default to preserve the previous behavior
of the conan ffmpeg package.

harfbuzz version is set to 8.3.0 to reduce conflicts since most
of Conan center is pinned to 8.x.

https://github.com/conan-io/conan-center-index/issues/22578

recipes/ffmpeg/all/conanfile.py

@@ -46,6 +46,9 @@ class FFMpegConan(ConanFile):
         "with_lzma": [True, False],
         "with_libiconv": [True, False],
         "with_freetype": [True, False],
+        "with_fontconfig": [True, False],
+        "with_fribidi": [True, False],
+        "with_harfbuzz": [True, False],
         "with_openjpeg": [True, False],
         "with_openh264": [True, False],
         "with_opus": [True, False],
@@ -131,6 +134,9 @@ class FFMpegConan(ConanFile):
         "with_lzma": True,
         "with_libiconv": True,
         "with_freetype": True,
+        "with_fontconfig": False,
+        "with_fribidi": False,
+        "with_harfbuzz": False,
         "with_openjpeg": True,
         "with_openh264": True,
         "with_opus": True,
@@ -227,6 +233,9 @@ class FFMpegConan(ConanFile):
             "with_libfdk_aac": ["avcodec"],
             "with_libwebp": ["avcodec"],
             "with_freetype": ["avfilter"],
+            "with_fontconfig": ["avfilter"],
+            "with_fribidi": ["avfilter"],
+            "with_harfbuzz": ["avfilter"],
             "with_zeromq": ["avfilter", "avformat"],
             "with_libalsa": ["avdevice"],
             "with_xcb": ["avdevice"],
@@ -244,6 +253,11 @@ class FFMpegConan(ConanFile):
     def _version_supports_libsvtav1(self):
         return Version(self.version) >= "5.1.0"
 
+    @property
+    def _version_supports_harfbuzz(self):
+        # https://github.com/FFmpeg/FFmpeg/compare/n6.0.1...n6.1#diff-90d08e583c4c9c6f391b2ae90f819f600a6326928ea9512c9e0c6d98e9f29ac2R235
+        return Version(self.version) >= "6.1"
+
     def export_sources(self):
         export_conandata_patches(self)
 
@@ -272,6 +286,8 @@ class FFMpegConan(ConanFile):
             del self.options.with_mediacodec
         if not self._version_supports_libsvtav1:
             self.options.rm_safe("with_libsvtav1")
+        if not self._version_supports_harfbuzz:
+            self.options.rm_safe("with_harfbuzz")
         if self.settings.os == "Android":
             del self.options.with_libfdk_aac
 
@@ -293,8 +309,14 @@ class FFMpegConan(ConanFile):
             self.requires("xz_utils/5.4.5")
         if self.options.with_libiconv:
             self.requires("libiconv/1.17")
-        if self.options.with_freetype:
+        if self.options.get_safe("with_freetype"):
             self.requires("freetype/2.13.2")
+        if self.options.get_safe("with_fontconfig"):
+            self.requires("fontconfig/2.15.0")
+        if self.options.get_safe("with_fribidi"):
+            self.requires("fribidi/1.0.13")
+        if self.options.get_safe("with_harfbuzz"):
+            self.requires("harfbuzz/8.3.0")
         if self.options.with_openjpeg:
             self.requires("openjpeg/2.5.2")
         if self.options.with_openh264:
@@ -503,6 +525,9 @@ class FFMpegConan(ConanFile):
             opt_enable_disable("zlib", self.options.with_zlib),
             opt_enable_disable("lzma", self.options.with_lzma),
             opt_enable_disable("iconv", self.options.with_libiconv),
+            opt_enable_disable("libfreetype", self.options.get_safe("with_freetype")),
+            opt_enable_disable("libfontconfig", self.options.get_safe("with_fontconfig")),
+            opt_enable_disable("libfribidi", self.options.get_safe("with_fribidi")),
             opt_enable_disable("libopenjpeg", self.options.with_openjpeg),
             opt_enable_disable("libopenh264", self.options.with_openh264),
             opt_enable_disable("libvorbis", self.options.with_vorbis),
@@ -608,6 +633,8 @@ class FFMpegConan(ConanFile):
 
         if self._version_supports_libsvtav1:
             args.append(opt_enable_disable("libsvtav1", self.options.get_safe("with_libsvtav1")))
+        if self._version_supports_harfbuzz:
+            args.append(opt_enable_disable("libharfbuzz", self.options.get_safe("with_harfbuzz")))
         if is_apple_os(self):
             # relocatable shared libs
             args.append("--install-name-dir=@rpath")
@@ -918,8 +945,14 @@ class FFMpegConan(ConanFile):
                 avformat.frameworks.append("Security")
 
         if self.options.avfilter:
-            if self.options.with_freetype:
+            if self.options.get_safe("with_freetype"):
                 avfilter.requires.append("freetype::freetype")
+            if self.options.get_safe("with_fontconfig"):
+                avfilter.requires.append("fontconfig::fontconfig")
+            if self.options.get_safe("with_fribidi"):
+                avfilter.requires.append("fribidi::fribidi")
+            if self.options.get_safe("with_harfbuzz"):
+                avfilter.requires.append("harfbuzz::harfbuzz")
             if self.options.with_zeromq:
                 avfilter.requires.append("zeromq::libzmq")
             if self.options.get_safe("with_appkit"):