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Clean up FFmpeg extension instructions.

Browse source 
Also add instructions for building arm64-v8a and x86.

Issue: #2561

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=152141270
This commit is contained in:
andrewlewis 2017-04-04 09:34:45 -07:00 committed by Oliver Woodman
parent 8208a75f0a
commit 9bbc6d1071
2 changed files with 44 additions and 24 deletions
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61
extensions/ffmpeg/README.md
View file

@ -31,21 +31,12 @@ FFMPEG_EXT_PATH="${EXOPLAYER_ROOT}/extensions/ffmpeg/src/main"
NDK_PATH="<path to Android NDK>"
```
* Fetch and build FFmpeg. For example, to fetch and build for armv7a:
* Fetch and build FFmpeg. For example, to fetch and build for armeabi-v7a,
arm64-v8a and x86 on Linux x86_64:
```
cd "${FFMPEG_EXT_PATH}/jni" && \
git clone git://source.ffmpeg.org/ffmpeg ffmpeg && cd ffmpeg && \
./configure \
--libdir=android-libs/armeabi-v7a \
--arch=arm \
--cpu=armv7-a \
--cross-prefix="${NDK_PATH}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-" \
COMMON_OPTIONS="\
--target-os=android \
--sysroot="${NDK_PATH}/platforms/android-9/arch-arm/" \
--extra-cflags="-march=armv7-a -mfloat-abi=softfp" \
--extra-ldflags="-Wl,--fix-cortex-a8" \
--extra-ldexeflags=-pie \
--disable-static \
--enable-shared \
--disable-doc \
@ -57,22 +48,56 @@ git clone git://source.ffmpeg.org/ffmpeg ffmpeg && cd ffmpeg && \
--disable-postproc \
--disable-avfilter \
--disable-symver \
--disable-swresample \
--enable-avresample \
--enable-decoder=vorbis \
--enable-decoder=opus \
--enable-decoder=flac \
--enable-decoder=alac \
" && \
cd "${FFMPEG_EXT_PATH}/jni" && \
git clone git://source.ffmpeg.org/ffmpeg ffmpeg && cd ffmpeg && \
./configure \
--libdir=android-libs/armeabi-v7a \
--arch=arm \
--cpu=armv7-a \
--cross-prefix="${NDK_PATH}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-" \
--sysroot="${NDK_PATH}/platforms/android-9/arch-arm/" \
--extra-cflags="-march=armv7-a -mfloat-abi=softfp" \
--extra-ldflags="-Wl,--fix-cortex-a8" \
--extra-ldexeflags=-pie \
${COMMON_OPTIONS} \
&& \
make -j4 && \
make install-libs
make -j4 && make install-libs && \
make clean && ./configure \
--libdir=android-libs/arm64-v8a \
--arch=aarch64 \
--cpu=armv8-a \
--cross-prefix="${NDK_PATH}/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-" \
--sysroot="${NDK_PATH}/platforms/android-21/arch-arm64/" \
--extra-ldexeflags=-pie \
${COMMON_OPTIONS} \
&& \
make -j4 && make install-libs && \
make clean && ./configure \
--libdir=android-libs/x86 \
--arch=x86 \
--cpu=i686 \
--cross-prefix="${NDK_PATH}/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/i686-linux-android-" \
--sysroot="${NDK_PATH}/platforms/android-9/arch-x86/" \
--extra-ldexeflags=-pie \
--disable-asm \
${COMMON_OPTIONS} \
&& \
make -j4 && make install-libs && \
make clean
```
* Build the JNI native libraries. Repeat this step for any other architectures
you need to support.
* Build the JNI native libraries, setting `APP_ABI` to include the architectures
built in the previous step. For example:
```
cd "${FFMPEG_EXT_PATH}"/jni && \
${NDK_PATH}/ndk-build APP_ABI=armeabi-v7a -j4
${NDK_PATH}/ndk-build APP_ABI="armeabi-v7a arm64-v8a x86" -j4
```
* In your project, you can add a dependency on the extension by using a rule

7
extensions/ffmpeg/src/main/jni/Android.mk
View file

@ -31,15 +31,10 @@ LOCAL_MODULE := libavresample
LOCAL_SRC_FILES := ffmpeg/android-libs/$(TARGET_ARCH_ABI)/$(LOCAL_MODULE).so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libswresample
LOCAL_SRC_FILES := ffmpeg/android-libs/$(TARGET_ARCH_ABI)/$(LOCAL_MODULE).so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := ffmpeg_jni.cc
LOCAL_C_INCLUDES := ffmpeg
LOCAL_SHARED_LIBRARIES := libavcodec libavresample libavutil libswresample
LOCAL_SHARED_LIBRARIES := libavcodec libavresample libavutil
LOCAL_LDLIBS := -Lffmpeg/android-libs/$(TARGET_ARCH_ABI) -llog
include $(BUILD_SHARED_LIBRARY)