Add GitHub Actions CI script

.github/scripts/build.sh

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+#!/bin/bash
+
+ROOT_DIR="$(pwd)"
+FFMPEG_VERSION="6.0"
+NUM_JOBS="4"
+
+if [ $# -eq 1 ]; then
+	PACKAGE_NAME="$1"
+	FFMPEG_OPTIONS=""
+	PSXAVENC_OPTIONS=""
+elif [ $# -eq 3 ]; then
+	PACKAGE_NAME="$1"
+	FFMPEG_OPTIONS="--arch=x86 --target-os=mingw32 --cross-prefix=$2-"
+	PSXAVENC_OPTIONS="--cross-file $3"
+else
+	echo "Usage: $0 <package name> [cross prefix] [cross file]"
+	exit 0
+fi
+
+## Download FFmpeg
+
+if [ ! -d ffmpeg-$FFMPEG_VERSION ]; then
+	wget "https://ffmpeg.org/releases/ffmpeg-$FFMPEG_VERSION.tar.xz" \
+		|| exit 1
+	tar Jxf ffmpeg-$FFMPEG_VERSION.tar.xz \
+		|| exit 1
+
+	rm -f ffmpeg-$FFMPEG_VERSION.tar.xz
+fi
+
+## Build FFmpeg
+
+mkdir -p ffmpeg-build
+cd ffmpeg-build
+
+../ffmpeg-$FFMPEG_VERSION/configure \
+	--prefix="$ROOT_DIR/ffmpeg-dist" \
+	$FFMPEG_OPTIONS \
+	--enable-gpl \
+	--enable-version3 \
+	--enable-static \
+	--disable-shared \
+	--enable-small \
+	--disable-programs \
+	--disable-doc \
+	--disable-avdevice \
+	--disable-postproc \
+	--disable-avfilter \
+	--disable-network \
+	--disable-encoders \
+	--disable-hwaccels \
+	--disable-muxers \
+	--disable-bsfs \
+	--disable-devices \
+	--disable-filters \
+	--disable-mmx \
+	|| exit 2
+make -j $NUM_JOBS \
+	|| exit 2
+make install \
+	|| exit 2
+
+cd ..
+rm -rf ffmpeg-build
+
+## Build psxavenc
+
+meson setup \
+	--buildtype release \
+	--strip \
+	--prefix $ROOT_DIR/psxavenc-dist \
+	--pkg-config-path $ROOT_DIR/ffmpeg-dist/lib/pkgconfig \
+	$PSXAVENC_OPTIONS \
+	psxavenc-build \
+	psxavenc \
+	|| exit 3
+meson compile -C psxavenc-build \
+	|| exit 3
+meson install -C psxavenc-build \
+	|| exit 3
+
+rm -rf ffmpeg-dist psxavenc-build
+
+## Package psxavenc
+
+cd psxavenc-dist
+
+zip -9 -r ../$PACKAGE_NAME.zip . \
+	|| exit 4
+
+cd ..
+rm -rf psxavenc-dist

.github/scripts/mingw-cross.txt

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+[binaries]
+c         = 'x86_64-w64-mingw32-gcc'
+cpp       = 'x86_64-w64-mingw32-g++'
+ar        = 'x86_64-w64-mingw32-ar'
+strip     = 'x86_64-w64-mingw32-strip'
+pkgconfig = 'pkg-config'
+
+[host_machine]
+system     = 'windows'
+cpu_family = 'x86_64'
+cpu        = 'x86_64'
+endian     = 'little'