Add ffmpeg plugin on Windows (fixes #3159)

Author: kuba160

.github/workflows/windowsbuild.yml

@@ -20,6 +20,7 @@ jobs:
           mingw-w64-x86_64-flac mingw-w64-x86_64-curl mingw-w64-x86_64-portaudio mingw-w64-x86_64-faad2 mingw-w64-x86_64-flac
           mingw-w64-x86_64-wavpack mingw-w64-x86_64-libvorbis mingw-w64-x86_64-libogg mingw-w64-x86_64-opusfile mingw-w64-x86_64-opus
           mingw-w64-x86_64-libsndfile mingw-w64-x86_64-libsamplerate mingw-w64-x86_64-yasm rsync
+          mingw-w64-x86_64-ffmpeg
     - name: Build for Windows
       shell: msys2 {0}
       run: TRAVIS_OS_NAME=windows travis/build.sh

plugins/ffmpeg/ffmpeg.c

@@ -305,7 +305,11 @@ _free_info_data(ffmpeg_info_t *info) {
         avcodec_free_frame(&info->frame);
     }
     if (info->buffer) {
+#ifdef __MINGW32__
+        __mingw_aligned_free (info->buffer);
+#else
         free (info->buffer);
+#endif
     }
     // free everything allocated in _init and _read
     if (info->have_packet) {

premake5.lua

@@ -28,7 +28,7 @@ newoption {
 
 if _OPTIONS["standard"] ~= nil then
   plugins_to_disable = {"plugin-converter", "plugin-converter_gtk2",
-                        "plugin-converter_gtk3","plugin-ffmpeg","plugin-waveout",
+                        "plugin-converter_gtk3", "plugin-waveout",
                         "plugin-wildmidi", "plugin-soundtouch", "plugin-sid", "plugin-gme",
                         "plugin-mms", "plugin-cdda", "plugin-sc68", "plugin-vtx",
                         "plugin-notify"}
@@ -742,7 +742,8 @@ project "ffmpeg"
     "plugins/ffmpeg/*.c",
   }
   pkgconfig ("libavformat")
-  -- links {"avcodec", "pthread", "avformat", "avcodec", "avutil", "z", "opencore-amrnb", "opencore-amrwb", "opus"}
+  pkgconfig ("libavcodec")
+  pkgconfig ("libavutil")
 end
 
 if option ("plugin-vorbis", "vorbisfile vorbis ogg") then