Build dependencies from sources

The project has 3 build dependencies:
 - SDL
 - FFmpeg
 - libusb

For Windows, the release script downloaded pre-built build dependencies
(either from upstream, or from the scrcpy-deps repository).

Instead, download the source releases and build locally. This offers
more flexibility.

The official adb release is still downloaded and included as is in the
release archive (it is not a build dependency).

app/deps/.gitignore

@@ -0,0 +1,2 @@
+/data
+/install

app/deps/README

@@ -0,0 +1,25 @@
+This directory (app/deps/) contains:
+
+*.sh          : shell scripts to download and build dependencies
+patches/      : patches to fix dependencies (used by scripts)
+data/sources/ : downloaded tarballs and extracted folders
+                    ffmpeg-6.1.1.tar.xz
+                    ffmpeg-6.1.1/
+                    libusb-1.0.27.tar.gz
+                    libusb-1.0.27/
+                    ...
+data/work/    : build dirs for each dependency/version/architecture
+                    ffmpeg-6.1.1/build-win32
+                    ffmpeg-6.1.1/build-win64
+                    libusb-1.0.27/build-win32
+                    libusb-1.0.27/build-win64
+                    ...
+install/      : install dirs for each architexture
+                    win32/bin/
+                    win32/include/
+                    win32/lib/
+                    win32/share/
+                    win64/bin/
+                    win64/include/
+                    win64/lib/
+                    win64/share/

app/deps/adb.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+set -ex
+DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
+cd "$DEPS_DIR"
+. common
+
+VERSION=34.0.5
+FILENAME=platform-tools_r$VERSION-windows.zip
+PROJECT_DIR=platform-tools-$VERSION
+SHA256SUM=3f8320152704377de150418a3c4c9d07d16d80a6c0d0d8f7289c22c499e33571
+
+cd "$SOURCES_DIR"
+
+if [[ -d "$PROJECT_DIR" ]]
+then
+    echo "$PWD/$PROJECT_DIR" found
+else
+    get_file "https://dl.google.com/android/repository/$FILENAME" "$FILENAME" "$SHA256SUM"
+    mkdir -p "$PROJECT_DIR"
+    cd "$PROJECT_DIR"
+    ZIP_PREFIX=platform-tools
+    unzip "../$FILENAME" \
+        "$ZIP_PREFIX"/AdbWinApi.dll \
+        "$ZIP_PREFIX"/AdbWinUsbApi.dll \
+        "$ZIP_PREFIX"/adb.exe
+    mv "$ZIP_PREFIX"/* .
+    rmdir "$ZIP_PREFIX"
+fi
+
+mkdir -p "$INSTALL_DIR/bin"
+cd "$INSTALL_DIR/bin"
+cp -r "$SOURCES_DIR/$PROJECT_DIR"/. "$INSTALL_DIR/bin/"

app/deps/common

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+# This file is intended to be sourced by other scripts, not executed
+
+if [[ $# != 1 ]]
+then
+    # <host>: win32 or win64
+    echo "Syntax: $0 <host>" >&2
+    exit 1
+fi
+
+HOST="$1"
+
+if [[ "$HOST" = win32 ]]
+then
+    HOST_TRIPLET=i686-w64-mingw32
+elif [[ "$HOST" = win64 ]]
+then
+    HOST_TRIPLET=x86_64-w64-mingw32
+else
+    echo "Unsupported host: $HOST" >&2
+    exit 1
+fi
+
+DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
+cd "$DEPS_DIR"
+
+PATCHES_DIR="$PWD/patches"
+
+INSTALL_DIR="$PWD/install/$HOST"
+
+# Contains $SOURCE_DIR and $WORK_DIR
+DATA_DIR="$PWD/data"
+
+# Contains downloaded tarballs and extracted folders
+SOURCES_DIR="$DATA_DIR/sources"
+
+# Contains build dirs
+WORK_DIR="$DATA_DIR/work"
+
+mkdir -p "$INSTALL_DIR" "$SOURCES_DIR" "$WORK_DIR"
+
+checksum() {
+    local file="$1"
+    local sum="$2"
+    echo "$file: verifying checksum..."
+    echo "$sum  $file" | sha256sum -c
+}
+
+get_file() {
+    local url="$1"
+    local file="$2"
+    local sum="$3"
+    if [[ -f "$file" ]]
+    then
+        echo "$file: found"
+    else
+        echo "$file: not found, downloading..."
+        wget "$url" -O "$file"
+    fi
+    checksum "$file" "$sum"
+}

app/deps/ffmpeg.sh

@@ -0,0 +1,91 @@
+#!/usr/bin/env bash
+set -ex
+DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
+cd "$DEPS_DIR"
+. common
+
+VERSION=6.1.1
+FILENAME=ffmpeg-$VERSION.tar.xz
+PROJECT_DIR=ffmpeg-$VERSION
+SHA256SUM=8684f4b00f94b85461884c3719382f1261f0d9eb3d59640a1f4ac0873616f968
+
+cd "$SOURCES_DIR"
+
+if [[ -d "$PROJECT_DIR" ]]
+then
+    echo "$PWD/$PROJECT_DIR" found
+else
+    get_file "https://ffmpeg.org/releases/$FILENAME" "$FILENAME" "$SHA256SUM"
+    tar xf "$FILENAME"  # First level directory is "$PROJECT_DIR"
+    patch -d "$PROJECT_DIR" -p1 < "$PATCHES_DIR"/ffmpeg-6.1-fix-build.patch
+fi
+
+mkdir -p "$WORK_DIR/$PROJECT_DIR"
+cd "$WORK_DIR/$PROJECT_DIR"
+
+if [[ "$HOST" = win32 ]]
+then
+    ARCH=x86
+elif [[ "$HOST" = win64 ]]
+then
+    ARCH=x86_64
+else
+    echo "Unsupported host: $HOST" >&2
+    exit 1
+fi
+
+# -static-libgcc to avoid missing libgcc_s_dw2-1.dll
+# -static to avoid dynamic dependency to zlib
+export CFLAGS='-static-libgcc -static'
+export CXXFLAGS="$CFLAGS"
+export LDFLAGS='-static-libgcc -static'
+
+if [[ -d "build-$HOST" ]]
+then
+    echo "'$PWD/build-$HOST' already exists, not reconfigured"
+    cd "build-$HOST"
+else
+    mkdir "build-$HOST"
+    cd "build-$HOST"
+
+    "$SOURCES_DIR/$PROJECT_DIR"/configure \
+        --prefix="$INSTALL_DIR" \
+        --enable-cross-compile \
+        --target-os=mingw32 \
+        --arch="$ARCH" \
+        --cross-prefix="${HOST_TRIPLET}-" \
+        --cc="${HOST_TRIPLET}-gcc" \
+        --extra-cflags="-O2 -fPIC" \
+        --enable-shared \
+        --disable-static \
+        --disable-programs \
+        --disable-doc \
+        --disable-swscale \
+        --disable-postproc \
+        --disable-avfilter \
+        --disable-avdevice \
+        --disable-network \
+        --disable-everything \
+        --enable-swresample \
+        --enable-decoder=h264 \
+        --enable-decoder=hevc \
+        --enable-decoder=av1 \
+        --enable-decoder=pcm_s16le \
+        --enable-decoder=opus \
+        --enable-decoder=aac \
+        --enable-decoder=flac \
+        --enable-decoder=png \
+        --enable-protocol=file \
+        --enable-demuxer=image2 \
+        --enable-parser=png \
+        --enable-zlib \
+        --enable-muxer=matroska \
+        --enable-muxer=mp4 \
+        --enable-muxer=opus \
+        --enable-muxer=flac \
+        --enable-muxer=wav \
+        --disable-vulkan
+fi
+
+make -j
+make install

app/deps/libusb.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+set -ex
+DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
+cd "$DEPS_DIR"
+. common
+
+VERSION=1.0.27
+FILENAME=libusb-$VERSION.tar.gz
+PROJECT_DIR=libusb-$VERSION
+SHA256SUM=e8f18a7a36ecbb11fb820bd71540350d8f61bcd9db0d2e8c18a6fb80b214a3de
+
+cd "$SOURCES_DIR"
+
+if [[ -d "$PROJECT_DIR" ]]
+then
+    echo "$PWD/$PROJECT_DIR" found
+else
+    get_file "https://github.com/libusb/libusb/archive/refs/tags/v$VERSION.tar.gz" "$FILENAME" "$SHA256SUM"
+    tar xf "$FILENAME"  # First level directory is "$PROJECT_DIR"
+fi
+
+mkdir -p "$WORK_DIR/$PROJECT_DIR"
+cd "$WORK_DIR/$PROJECT_DIR"
+
+export CFLAGS='-O2'
+export CXXFLAGS="$CFLAGS"
+
+if [[ -d "build-$HOST" ]]
+then
+    echo "'$PWD/build-$HOST' already exists, not reconfigured"
+    cd "build-$HOST"
+else
+    mkdir "build-$HOST"
+    cd "build-$HOST"
+
+    "$SOURCES_DIR/$PROJECT_DIR"/bootstrap.sh
+    "$SOURCES_DIR/$PROJECT_DIR"/configure \
+        --prefix="$INSTALL_DIR" \
+        --host="$HOST_TRIPLET" \
+        --enable-shared \
+        --disable-static
+fi
+
+make -j
+make install-strip

app/deps/patches/ffmpeg-6.1-fix-build.patch

@@ -0,0 +1,27 @@
+From 03c80197afb324da38c9b70254231e3fdcfa68fc Mon Sep 17 00:00:00 2001
+From: Romain Vimont <rom@rom1v.com>
+Date: Sun, 12 Nov 2023 17:58:50 +0100
+Subject: [PATCH] Fix FFmpeg 6.1 build
+
+Build failed on tag n6.1 With --enable-decoder=av1 but without
+--enable-muxer=av1.
+---
+ libavcodec/Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libavcodec/Makefile b/libavcodec/Makefile
+index 580a8d6b54..aff19b670c 100644
+--- a/libavcodec/Makefile
++++ b/libavcodec/Makefile
+@@ -249,7 +249,7 @@ OBJS-$(CONFIG_ATRAC3PAL_DECODER)       += atrac3plusdec.o atrac3plus.o \
+ OBJS-$(CONFIG_ATRAC9_DECODER)          += atrac9dec.o
+ OBJS-$(CONFIG_AURA_DECODER)            += cyuv.o
+ OBJS-$(CONFIG_AURA2_DECODER)           += aura.o
+-OBJS-$(CONFIG_AV1_DECODER)             += av1dec.o
++OBJS-$(CONFIG_AV1_DECODER)             += av1dec.o av1_parse.o
+ OBJS-$(CONFIG_AV1_CUVID_DECODER)       += cuviddec.o
+ OBJS-$(CONFIG_AV1_MEDIACODEC_DECODER)  += mediacodecdec.o
+ OBJS-$(CONFIG_AV1_MEDIACODEC_ENCODER)  += mediacodecenc.o
+-- 
+2.42.0
+

app/deps/sdl.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+set -ex
+DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
+cd "$DEPS_DIR"
+. common
+
+VERSION=2.28.5
+FILENAME=SDL-$VERSION.tar.gz
+PROJECT_DIR=SDL-release-$VERSION
+SHA256SUM=9f0556e4a24ef5b267010038ad9e9948b62f236d5bcc4b22179f95ef62d84023
+
+cd "$SOURCES_DIR"
+
+if [[ -d "$PROJECT_DIR" ]]
+then
+    echo "$PWD/$PROJECT_DIR" found
+else
+    get_file "https://github.com/libsdl-org/SDL/archive/refs/tags/release-$VERSION.tar.gz" "$FILENAME" "$SHA256SUM"
+    tar xf "$FILENAME"  # First level directory is "$PROJECT_DIR"
+fi
+
+mkdir -p "$WORK_DIR/$PROJECT_DIR"
+cd "$WORK_DIR/$PROJECT_DIR"
+
+export CFLAGS='-O2'
+export CXXFLAGS="$CFLAGS"
+
+if [[ -d "build-$HOST" ]]
+then
+    echo "'$PWD/build-$HOST' already exists, not reconfigured"
+    cd "build-$HOST"
+else
+    mkdir "build-$HOST"
+    cd "build-$HOST"
+
+    "$SOURCES_DIR/$PROJECT_DIR"/configure \
+        --prefix="$INSTALL_DIR" \
+        --host="$HOST_TRIPLET" \
+        --enable-shared \
+        --disable-static
+fi
+
+make -j
+# There is no "make install-strip"
+make install
+# Strip manually
+${HOST_TRIPLET}-strip "$INSTALL_DIR/bin/SDL2.dll"