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+# Getting Started
+
+How to get and build the libyuv code.
+
+## Pre-requisites
+
+You'll need to have depot tools installed: https://www.chromium.org/developers/how-tos/install-depot-tools
+Refer to chromium instructions for each platform for other prerequisites.
+
+## Getting the Code
+
+Create a working directory, enter it, and run:
+
+    gclient config https://chromium.googlesource.com/libyuv/libyuv
+    gclient sync
+
+
+Then you'll get a .gclient file like:
+
+    solutions = [
+      { "name"        : "libyuv",
+        "url"         : "https://chromium.googlesource.com/libyuv/libyuv",
+        "deps_file"   : "DEPS",
+        "managed"     : True,
+        "custom_deps" : {
+        },
+        "safesync_url": "",
+      },
+    ];
+
+
+For iOS add `;target_os=['ios'];` to your OSX .gclient and run `GYP_DEFINES="OS=ios" gclient sync.`
+
+Browse the Git reprository: https://chromium.googlesource.com/libyuv/libyuv/+/master
+
+### Android
+For Android add `;target_os=['android'];` to your Linux .gclient
+
+
+    solutions = [
+      { "name"        : "libyuv",
+        "url"         : "https://chromium.googlesource.com/libyuv/libyuv",
+        "deps_file"   : "DEPS",
+        "managed"     : True,
+        "custom_deps" : {
+        },
+        "safesync_url": "",
+      },
+    ];
+    target_os = ["android", "unix"];
+
+Then run:
+
+    export GYP_DEFINES="OS=android"
+    gclient sync
+
+Caveat: Theres an error with Google Play services updates.  If you get the error "Your version of the Google Play services library is not up to date", run the following:
+    cd chromium/src
+    ./build/android/play_services/update.py download
+    cd ../..
+
+For Windows the gclient sync must be done from an Administrator command prompt.
+
+The sync will generate native build files for your environment using gyp (Windows: Visual Studio, OSX: XCode, Linux: make). This generation can also be forced manually: `gclient runhooks`
+
+To get just the source (not buildable):
+    git clone https://chromium.googlesource.com/libyuv/libyuv
+
+
+## Building the Library and Unittests
+
+### Windows
+
+    set GYP_DEFINES=target_arch=ia32
+    call python gyp_libyuv -fninja -G msvs_version=2013
+    ninja -j7 -C out\Release
+    ninja -j7 -C out\Debug
+
+    set GYP_DEFINES=target_arch=x64
+    call python gyp_libyuv -fninja -G msvs_version=2013
+    ninja -C out\Debug_x64
+    ninja -C out\Release_x64
+
+#### Building with clangcl
+    set GYP_DEFINES=clang=1 target_arch=ia32 libyuv_enable_svn=1
+    set LLVM_REPO_URL=svn://svn.chromium.org/llvm-project
+    call python tools\clang\scripts\update.py
+    call python gyp_libyuv -fninja libyuv_test.gyp
+    ninja -C out\Debug
+    ninja -C out\Release
+
+### OSX
+
+Clang 64 bit shown. Remove `clang=1` for GCC and change x64 to ia32 for 32 bit.
+
+    GYP_DEFINES="clang=1 target_arch=x64" ./gyp_libyuv
+    ninja -j7 -C out/Debug
+    ninja -j7 -C out/Release
+
+    GYP_DEFINES="clang=1 target_arch=ia32" ./gyp_libyuv
+    ninja -j7 -C out/Debug
+    ninja -j7 -C out/Release
+
+### iOS
+http://www.chromium.org/developers/how-tos/build-instructions-ios
+
+Add to .gclient last line: `target_os=['ios'];`
+
+armv7
+
+    GYP_DEFINES="OS=ios target_arch=armv7 target_subarch=arm32" GYP_CROSSCOMPILE=1 GYP_GENERATOR_FLAGS="output_dir=out_ios" ./gyp_libyuv
+    ninja -j7 -C out_ios/Debug-iphoneos libyuv_unittest
+    ninja -j7 -C out_ios/Release-iphoneos libyuv_unittest
+
+arm64
+
+    GYP_DEFINES="OS=ios target_arch=arm64 target_subarch=arm64" GYP_CROSSCOMPILE=1 GYP_GENERATOR_FLAGS="output_dir=out_ios" ./gyp_libyuv
+    ninja -j7 -C out_ios/Debug-iphoneos libyuv_unittest
+    ninja -j7 -C out_ios/Release-iphoneos libyuv_unittest
+
+both armv7 and arm64 (fat)
+
+    GYP_DEFINES="OS=ios target_arch=armv7 target_subarch=both" GYP_CROSSCOMPILE=1 GYP_GENERATOR_FLAGS="output_dir=out_ios" ./gyp_libyuv
+    ninja -j7 -C out_ios/Debug-iphoneos libyuv_unittest
+    ninja -j7 -C out_ios/Release-iphoneos libyuv_unittest
+
+simulator
+
+    GYP_DEFINES="OS=ios target_arch=ia32 target_subarch=arm32" GYP_CROSSCOMPILE=1 GYP_GENERATOR_FLAGS="output_dir=out_sim" ./gyp_libyuv
+    ninja -j7 -C out_sim/Debug-iphonesimulator libyuv_unittest
+    ninja -j7 -C out_sim/Release-iphonesimulator libyuv_unittest
+
+### Android
+https://code.google.com/p/chromium/wiki/AndroidBuildInstructions
+
+Add to .gclient last line: `target_os=['android'];`
+
+armv7
+
+    GYP_DEFINES="OS=android" GYP_CROSSCOMPILE=1 ./gyp_libyuv
+    ninja -j7 -C out/Debug libyuv_unittest_apk
+    ninja -j7 -C out/Release libyuv_unittest_apk
+
+arm64
+
+    GYP_DEFINES="OS=android target_arch=arm64 target_subarch=arm64" GYP_CROSSCOMPILE=1 ./gyp_libyuv
+    ninja -j7 -C out/Debug libyuv_unittest_apk
+    ninja -j7 -C out/Release libyuv_unittest_apk
+
+ia32
+
+    GYP_DEFINES="OS=android target_arch=ia32" GYP_CROSSCOMPILE=1 ./gyp_libyuv
+    ninja -j7 -C out/Debug libyuv_unittest_apk
+    ninja -j7 -C out/Release libyuv_unittest_apk
+
+    GYP_DEFINES="OS=android target_arch=ia32 android_full_debug=1" GYP_CROSSCOMPILE=1 ./gyp_libyuv
+    ninja -j7 -C out/Debug libyuv_unittest_apk
+
+mipsel
+
+    GYP_DEFINES="OS=android target_arch=mipsel" GYP_CROSSCOMPILE=1 ./gyp_libyuv
+    ninja -j7 -C out/Debug libyuv_unittest_apk
+    ninja -j7 -C out/Release libyuv_unittest_apk
+
+arm32 disassembly:
+
+    third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-objdump -d out/Release/obj/source/libyuv.row_neon.o
+
+arm64 disassembly:
+
+    third_party/android_tools/ndk/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-objdump -d out/Release/obj/source/libyuv.row_neon64.o
+
+Running tests:
+
+    util/android/test_runner.py gtest -s libyuv_unittest -t 7200 --verbose --release --gtest_filter=*
+
+Running test as benchmark:
+
+    util/android/test_runner.py gtest -s libyuv_unittest -t 7200 --verbose --release --gtest_filter=* -a "--libyuv_width=1280 --libyuv_height=720 --libyuv_repeat=999 --libyuv_flags=-1"
+
+Running test with C code:
+
+    util/android/test_runner.py gtest -s libyuv_unittest -t 7200 --verbose --release --gtest_filter=* -a "--libyuv_width=1280 --libyuv_height=720 --libyuv_repeat=999 --libyuv_flags=1 --libyuv_cpu_info=1"
+
+#### Building with GN
+
+    gn gen out/Release "--args=is_debug=false target_cpu=\"x86\""
+    gn gen out/Debug "--args=is_debug=true target_cpu=\"x86\""
+    ninja -C out/Release
+    ninja -C out/Debug
+
+### Building Offical with GN
+
+    gn gen out/Official "--args=is_debug=false is_official_build=true is_chrome_branded=true"
+    ninja -C out/Official
+
+### Linux
+
+    GYP_DEFINES="target_arch=x64" ./gyp_libyuv
+    ninja -j7 -C out/Debug
+    ninja -j7 -C out/Release
+
+    GYP_DEFINES="target_arch=ia32" ./gyp_libyuv
+    ninja -j7 -C out/Debug
+    ninja -j7 -C out/Release
+
+#### CentOS
+
+On CentOS 32 bit the following work around allows a sync:
+
+    export GYP_DEFINES="host_arch=ia32"
+    gclient sync
+
+### Windows Shared Library
+
+Modify libyuv.gyp from 'static_library' to 'shared_library', and add 'LIBYUV_BUILDING_SHARED_LIBRARY' to 'defines'.
+
+    gclient runhooks
+
+After this command follow the building the library instructions above.
+
+If you get a compile error for atlthunk.lib on Windows, read http://www.chromium.org/developers/how-tos/build-instructions-windows
+
+
+### Build targets
+
+    ninja -C out/Debug libyuv
+    ninja -C out/Debug libyuv_unittest
+    ninja -C out/Debug compare
+    ninja -C out/Debug convert
+    ninja -C out/Debug psnr
+    ninja -C out/Debug cpuid
+
+
+## Building the Library with make
+
+### Linux
+
+    make -j7 V=1 -f linux.mk
+    make -j7 V=1 -f linux.mk clean
+    make -j7 V=1 -f linux.mk CXX=clang++
+
+## Building the Library with cmake
+
+Install cmake: http://www.cmake.org/
+
+Default debug build:
+
+    mkdir out
+    cd out
+    cmake ..
+    cmake --build .
+
+Release build/install
+
+    mkdir out
+    cd out
+    cmake -DCMAKE_INSTALL_PREFIX="/usr/lib" -DCMAKE_BUILD_TYPE="Release" ..
+    cmake --build . --config Release
+    sudo cmake --build . --target install --config Release
+
+### Windows 8 Phone
+
+Pre-requisite:
+
+* Install Visual Studio 2012 and Arm to your environment.<br>
+
+Then:
+
+    call "c:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin\x86_arm\vcvarsx86_arm.bat"
+
+or with Visual Studio 2013:
+
+    call "c:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\x86_arm\vcvarsx86_arm.bat"
+    nmake /f winarm.mk clean
+    nmake /f winarm.mk
+
+### Windows Shared Library
+
+Modify libyuv.gyp from 'static_library' to 'shared_library', and add 'LIBYUV_BUILDING_SHARED_LIBRARY' to 'defines'. Then run this.
+
+    gclient runhooks
+
+After this command follow the building the library instructions above.
+
+If you get a compile error for atlthunk.lib on Windows, read http://www.chromium.org/developers/how-tos/build-instructions-windows
+
+### 64 bit Windows
+
+    set GYP_DEFINES=target_arch=x64
+    gclient runhooks V=1
+
+### ARM Linux
+
+    export GYP_DEFINES="target_arch=arm"
+    export CROSSTOOL=`<path>`/arm-none-linux-gnueabi
+    export CXX=$CROSSTOOL-g++
+    export CC=$CROSSTOOL-gcc
+    export AR=$CROSSTOOL-ar
+    export AS=$CROSSTOOL-as
+    export RANLIB=$CROSSTOOL-ranlib
+    gclient runhooks
+
+## Running Unittests
+
+### Windows
+
+    out\Release\libyuv_unittest.exe --gtest_catch_exceptions=0 --gtest_filter="*"
+
+### OSX
+
+    out/Release/libyuv_unittest --gtest_filter="*"
+
+### Linux
+
+    out/Release/libyuv_unittest --gtest_filter="*"
+
+Replace --gtest_filter="*" with specific unittest to run.  May include wildcards. e.g.
+
+    out/Release/libyuv_unittest --gtest_filter=libyuvTest.I420ToARGB_Opt
+
+## CPU Emulator tools
+
+### Intel SDE (Software Development Emulator)
+
+Pre-requisite: Install IntelSDE for Windows: http://software.intel.com/en-us/articles/intel-software-development-emulator
+
+Then run:
+
+    c:\intelsde\sde -hsw -- out\release\libyuv_unittest.exe --gtest_filter=*
+
+
+## Memory tools
+
+### Running Dr Memory memcheck for Windows
+
+Pre-requisite: Install Dr Memory for Windows and add it to your path: http://www.drmemory.org/docs/page_install_windows.html
+
+    set GYP_DEFINES=build_for_tool=drmemory target_arch=ia32
+    call python gyp_libyuv -fninja -G msvs_version=2013
+    ninja -C out\Debug
+    drmemory out\Debug\libyuv_unittest.exe --gtest_catch_exceptions=0 --gtest_filter=*
+
+### Running UBSan
+
+See Chromium instructions for sanitizers: https://www.chromium.org/developers/testing/undefinedbehaviorsanitizer
+
+Sanitizers available: TSan, MSan, ASan, UBSan, LSan
+
+    GYP_DEFINES='ubsan=1' gclient runhooks
+    ninja -C out/Release
+
+### Running Valgrind memcheck
+
+Memory errors and race conditions can be found by running tests under special memory tools. [Valgrind] [1] is an instrumentation framework for building dynamic analysis tools. Various tests and profilers are built upon it to find memory handling errors and memory leaks, for instance.
+
+[1]: http://valgrind.org
+
+    solutions = [
+      { "name"        : "libyuv",
+        "url"         : "https://chromium.googlesource.com/libyuv/libyuv",
+        "deps_file"   : "DEPS",
+        "managed"     : True,
+        "custom_deps" : {
+           "libyuv/chromium/src/third_party/valgrind": "https://chromium.googlesource.com/chromium/deps/valgrind/binaries",
+        },
+        "safesync_url": "",
+      },
+    ]
+
+Then run:
+
+    GYP_DEFINES="clang=0 target_arch=x64 build_for_tool=memcheck" python gyp_libyuv
+    ninja -C out/Debug
+    valgrind out/Debug/libyuv_unittest
+
+
+For more information, see http://www.chromium.org/developers/how-tos/using-valgrind
+
+### Running Thread Sanitizer (TSan)
+
+    GYP_DEFINES="clang=0 target_arch=x64 build_for_tool=tsan" python gyp_libyuv
+    ninja -C out/Debug
+    valgrind out/Debug/libyuv_unittest
+
+For more info, see http://www.chromium.org/developers/how-tos/using-valgrind/threadsanitizer
+
+### Running Address Sanitizer (ASan)
+
+    GYP_DEFINES="clang=0 target_arch=x64 build_for_tool=asan" python gyp_libyuv
+    ninja -C out/Debug
+    valgrind out/Debug/libyuv_unittest
+
+For more info, see http://dev.chromium.org/developers/testing/addresssanitizer
+
+## Benchmarking
+
+The unittests can be used to benchmark.
+
+### Windows
+
+    set LIBYUV_WIDTH=1280
+    set LIBYUV_HEIGHT=720
+    set LIBYUV_REPEAT=999
+    set LIBYUV_FLAGS=-1
+    out\Release\libyuv_unittest.exe --gtest_filter=*I420ToARGB_Opt
+
+
+### Linux and Mac
+
+    LIBYUV_WIDTH=1280 LIBYUV_HEIGHT=720 LIBYUV_REPEAT=1000 out/Release/libyuv_unittest --gtest_filter=*I420ToARGB_Opt
+
+    libyuvTest.I420ToARGB_Opt (547 ms)
+
+Indicates 0.547 ms/frame for 1280 x 720.
+
+## Making a change
+
+    gclient sync
+    git checkout -b mycl -t origin/master
+    git pull
+    <edit files>
+    git add -u
+    git commit -m "my change"
+    git cl lint
+    git cl try
+    git cl upload -r a-reviewer@chomium.org -s
+    <once approved..>
+    git cl land