Random patches and tricks for building on M1

Needs newer code in some cases, and some conditionals to check platform. The external patches possibly should be brought in? Seems to work for now if anyone is in need. 

Learnings from https://github.com/ssut/ffmpeg-on-apple-silicon

Author: rtgoodwin

build-ffmpeg

@@ -8,11 +8,18 @@ VERSION=1.21
 CWD=$(pwd)
 PACKAGES="$CWD/packages"
 WORKSPACE="$CWD/workspace"
-CFLAGS="-I$WORKSPACE/include"
+CFLAGS='-I$WORKSPACE/include'
 LDFLAGS="-L$WORKSPACE/lib"
 LDEXEFLAGS=""
 EXTRALIBS="-ldl -lpthread -lm -lz"
 CONFIGURE_OPTIONS=()
+# Check for Apple Silicon 
+if [[ ( "$(uname -m)" == "arm64" ) && ( "$OSTYPE" == "darwin"* ) ]]; then 
+  # If arm64 AND darwin (macOS)
+  export ARCH=arm64
+  export MACOSX_DEPLOYMENT_TARGET=11.0
+fi
+
 
 # Speed up the process
 # Env Var NUMJOBS overrides automatic detection
@@ -350,11 +357,15 @@ if build "zlib"; then
 fi
 
 if build "openssl"; then
-	download "https://www.openssl.org/source/openssl-1.1.1h.tar.gz"
-	execute ./config --prefix="${WORKSPACE}" --openssldir="${WORKSPACE}" --with-zlib-include="${WORKSPACE}"/include/ --with-zlib-lib="${WORKSPACE}"/lib no-shared zlib
+	download "https://www.openssl.org/source/openssl-1.1.1i.tar.gz"
+	if [[ ( "$ARCH" == "arm64" ) && ( "$OSTYPE" == "darwin"* ) ]]; then 
+		sed -n 's/\(##### GNU Hurd\)/"darwin64-arm64-cc" => { \n    inherit_from     => [ "darwin-common", asm("aarch64_asm") ],\n    CFLAGS           => add("-Wall"),\n    cflags           => add("-arch arm64 "),\n    lib_cppflags     => add("-DL_ENDIAN"),\n    bn_ops           => "SIXTY_FOUR_BIT_LONG", \n    perlasm_scheme   => "macosx", \n}, \n\1/g' Configurations/10-main.conf
+   		execute ./Configure --prefix="${WORKSPACE}" no-shared no-asm darwin64-arm64-cc 
+	else
+		execute ./config --prefix="${WORKSPACE}" --openssldir="${WORKSPACE}" --with-zlib-include="${WORKSPACE}"/include/ --with-zlib-lib="${WORKSPACE}"/lib no-shared zlib 
+	fi
 	execute make -j $MJOBS
 	execute make install_sw
-
 	build_done "openssl"
 fi
 CONFIGURE_OPTIONS+=("--enable-openssl")
@@ -377,7 +388,11 @@ if build "x264"; then
 
 	if [[ "$OSTYPE" == "linux-gnu" ]]; then
 		execute ./configure --prefix="${WORKSPACE}" --enable-static --enable-pic CXXFLAGS="-fPIC"
-	else
+	elif [[ ( "$ARCH" == "arm64" ) && ( "$OSTYPE" == "darwin"* ) ]]; then 
+		## Get latest code to support arm64
+		git clone --depth 1 -b master https://code.videolan.org/videolan/x264.git
+		cd x264
+	else 
 		execute ./configure --prefix="${WORKSPACE}" --enable-static --enable-pic
 	fi
 
@@ -392,6 +407,7 @@ CONFIGURE_OPTIONS+=("--enable-libx264")
 if build "x265"; then
 	download "https://github.com/videolan/x265/archive/Release_3.5.tar.gz" "x265-3.5.tar.gz"
 	cd build/linux || exit
+
 	execute cmake -DCMAKE_INSTALL_PREFIX="${WORKSPACE}" -DENABLE_SHARED=off -DBUILD_SHARED_LIBS=OFF ../../source
 	execute make -j $MJOBS
 	execute make install
@@ -442,6 +458,12 @@ CONFIGURE_OPTIONS+=("--enable-libxvid")
 
 if build "vid_stab"; then
 	download "https://github.com/georgmartius/vid.stab/archive/v1.1.0.tar.gz" "vid.stab-1.1.0.tar.gz"
+	## rich
+	if [[ ( "$ARCH" == "arm64" ) && ( "$OSTYPE" == "darwin"* ) ]]; then 
+		curl -s -o "$PACKAGES/vid.stab-1.1.0/fix_cmake_quoting.patch" https://raw.githubusercontent.com/Homebrew/formula-patches/5bf1a0e0cfe666ee410305cece9c9c755641bfdf/libvidstab/fix_cmake_quoting.patch
+		patch -p1 < fix_cmake_quoting.patch
+	fi
+	## rich
 	execute cmake -DBUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX="${WORKSPACE}" -DUSE_OMP=OFF -DENABLE_SHARED=off .
 	execute make
 	execute make install
@@ -454,7 +476,13 @@ if build "av1"; then
 	download "https://aomedia.googlesource.com/aom/+archive/b52ee6d44adaef8a08f6984390de050d64df9faa.tar.gz" "av1.tar.gz" "av1"
 	make_dir "$PACKAGES"/aom_build
 	cd "$PACKAGES"/aom_build || exit
-	execute cmake -DENABLE_TESTS=0 -DCMAKE_INSTALL_PREFIX="${WORKSPACE}" -DCMAKE_INSTALL_LIBDIR=lib "$PACKAGES"/av1
+	## rich
+	if [[ ( "$ARCH" == "arm64" ) && ( "$OSTYPE" == "darwin"* ) ]]; then 
+		execute cmake -DENABLE_TESTS=0 -DCMAKE_INSTALL_PREFIX="${WORKSPACE}" -DCMAKE_INSTALL_LIBDIR=lib -DCONFIG_RUNTIME_CPU_DETECT=0 "$PACKAGES"/av1 
+	else
+		execute cmake -DENABLE_TESTS=0 -DCMAKE_INSTALL_PREFIX="${WORKSPACE}" -DCMAKE_INSTALL_LIBDIR=lib "$PACKAGES"/av1 
+	fi
+	## rich (added runtime detect )
 	execute make -j $MJOBS
 	execute make install
 
@@ -560,7 +588,7 @@ CONFIGURE_OPTIONS+=("--enable-libwebp")
 ##
 
 if build "libsdl"; then
-	download "https://www.libsdl.org/release/SDL2-2.0.12.tar.gz"
+	download "https://www.libsdl.org/release/SDL2-2.0.14.tar.gz"
 	execute ./configure --prefix="${WORKSPACE}" --disable-shared --enable-static
 	execute make -j $MJOBS
 	execute make install