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Fail av1 extension build if CMake is missing

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If a user has checked out libgav1 they almost certainly want to
build the extension, so fail if CMake is not present but
libgav1 is present. Also add a note to the README linking to
instructions for installing CMake.

Also remove the NDK check, as ndk.dir is apparently deprecated
and Android Studio appears to install this automatically anyway.

PiperOrigin-RevId: 273918142
This commit is contained in:
andrewlewis 2019-10-10 10:35:21 +01:00 committed by Ian Baker
parent 5cf82a5079
commit 3574345960
2 changed files with 11 additions and 14 deletions
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12
extensions/av1/README.md
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@ -41,15 +41,17 @@ cd "${AV1_EXT_PATH}/jni/libgav1" && \
git clone https://github.com/abseil/abseil-cpp.git third_party/abseil-cpp
```
libgav1 and [JNI wrapper library][] are built using [CMake][] set-up with
[Ninja][]. After following the instructions above to fetch libgav1, gradle will
build the extension automatically when run on the command line or via Android
Studio.
* [Install CMake][].
Having followed these steps, gradle will build the extension automatically when
run on the command line or via Android Studio, using [CMake][] and [Ninja][]
to configure and build libgav1 and the extension's [JNI wrapper library][].
[top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md
[JNI wrapper library]: https://github.com/google/ExoPlayer/blob/release-v2/extensions/av1/src/main/jni/gav1_jni.cc
[Install CMake]: https://developer.android.com/studio/projects/install-ndk
[CMake]: https://cmake.org/
[Ninja]: https://ninja-build.org
[JNI wrapper library]: https://github.com/google/ExoPlayer/blob/dev-v2/extensions/av1/src/main/jni/gav1_jni.cc
## Using the extension ##

13
extensions/av1/build.gradle
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@ -54,15 +54,10 @@ android {
}
}
// Check that the Android NDK, CMake and libgav1 are present, to avoid gradle
// sync failures if the tools aren't installed or libgav1 is missing. To use
// the extension it is necessary to install the NDK and CMake from the SDK
// Manager and fetch libgav1 following the steps in README.
def ndkDirectory = project.android.ndkDirectory
def sdkDirectory = project.android.sdkDirectory
if (ndkDirectory != null && !ndkDirectory.toString().isEmpty()
&& new File(sdkDirectory.toString() + '/cmake').exists()
&& project.file('src/main/jni/libgav1').exists()) {
// Configure the native build only if libgav1 is present, to avoid gradle sync
// failures if libgav1 hasn't been checked out according to the README and CMake
// isn't installed.
if (project.file('src/main/jni/libgav1').exists()) {
android.externalNativeBuild.cmake.path = 'src/main/jni/CMakeLists.txt'
android.externalNativeBuild.cmake.version = '3.7.1+'
}