FFmpeg支持libstagefright硬件解码

大家:我是ffmpeg的新手。 最近我正在项目上移植到Android设备ffmpeg。 一开始,我按照Internet上的一些指南,以非常正常的方式将ffmpeg编译为共享库(.so文件),并将它们加载到我的android应用程序中。 它完美的作品。

现在我想要ffmpeg使用libstagefright来完成硬件解码。 问题是,我可以编译.so库,但是当我启动我的应用程序并加载这些.so库,总是有一个java.lang.UnsatisfiedLinkError:无法加载库:reloc_library [1314]:114找不到'_ZN7android11MediaBufferC1Ej'

我在那里呆了几天。 有没有人遇到过类似的问题? 如果有人能给我一些关于这个错误的暗示,那将是非常棒的。

我的步骤:1.将ffmpeg-2.1.4源代码编译为.so共享库。 我使用build_libstagefright脚本来做到这一点,并根据一些来自Internet的指南进行一些修改。

#!/bin/bash #export NDK=/home/mingzhang/android/android-ndk-r9c export NDK=/home/mingzhang/android/android-ndk-r7 if [ "$NDK" = "" ]; then echo NDK variable not set, assuming ${HOME}/android-ndk export NDK=${HOME}/android-ndk fi echo "Fetching Android system headers" git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_frameworks_base.git ../android-source/frameworks/base git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_frameworks_av.git ../android-source/frameworks/av git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_frameworks_native.git ../android-source/frameworks/native git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_hardware_libhardware.git ../android-source/hardware/libhardware git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_system_core.git ../android-source/system/core echo "Fetching Android libraries for linking" # Libraries from any froyo/gingerbread device/emulator should work # fine, since the symbols used should be available on most of them. #if [ ! -d "../android-libs" ]; then # if [ ! -f "../update-cm-7.0.3-N1-signed.zip" ]; then # wget http://download.cyanogenmod.com/get/update-cm-7.0.3-N1-signed.zip -P../ # fi # unzip ../update-cm-7.0.3-N1-signed.zip system/lib/* -d../ # mv ../system/lib ../android-libs # rmdir ../system #fi SYSROOT=$NDK/platforms/android-9/arch-arm # Expand the prebuilt/* path into the correct one #TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64 TOOLCHAIN=/home/mingzhang/android/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86 export PATH=$TOOLCHAIN/bin:$PATH ANDROID_SOURCE=../android-source ANDROID_LIBS=../android-libs ABI="armeabi-v7a" CC=$TOOLCHAIN/bin/arm-linux-androideabi-gcc #CC=$TOOLCHAIN/bin/arm-eabi-gcc-4.4.3 NM=$TOOLCHAIN/bin/arm-linux-androideabi-nm #NM=$TOOLCHAIN/bin/arm-eabi-nm rm -rf ../build/stagefright mkdir -p ../build/stagefright ADDI_CFLAGS="-marm" DEST=../build/stagefright DEST="$DEST/$ABI" FLAGS="--target-os=linux --arch=arm --cpu=armv7-a --cross-prefix=arm-linux-androideabi- --cc=$CC --nm=$NM" #FLAGS="--target-os=linux --arch=arm --cpu=armv7-a --cross-prefix=arm-eabi- --cc=$CC --nm=$NM" FLAGS="$FLAGS --sysroot=$SYSROOT" #FLAGS="$FLAGS --disable-avdevice --disable-decoder=h264 --disable-decoder=h264_vdpau --enable-libstagefright-h264" FLAGS="$FLAGS --enable-shared --disable-demuxers --disable-muxers --disable-parsers --disable-avdevice --disable-filters --disable-programs --disable-encoders --disable-decoders --disable-decoder=h264 --disable-decoder=h264_vdpau --enable-decoder=libstagefright_h264 --enable-libstagefright-h264 \ --enable-asm \ --enable-neon \ --enable-cross-compile \ --enable-gpl \ --disable-static \ --enable-memalign-hack" EXTRA_CFLAGS="-I$DEST/include" EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/native/include" EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/native/include/media/openmax" EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/av/include" EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/base/include -I$ANDROID_SOURCE/system/core/include" EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/hardware/libhardware/include" EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/base/media/libstagefright" EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/base/include/media/stagefright/openmax" EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK/sources/cxx-stl/gnu-libstdc++/4.6/include -I$NDK/sources/cxx-stl/gnu-libstdc++/4.6/libs/$ABI/include" EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK/sources/cxx-stl/stlport/stlport" EXTRA_CFLAGS="$EXTRA_CFLAGS -march=armv7-a -mfloat-abi=softfp -mfpu=neon -marm -mtune=cortex-a8" EXTRA_CFLAGS="$EXTRA_CFLAGS -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -D_STLP_USE_NEWALLOC" EXTRA_LDFLAGS="-Wl,--fix-cortex-a8 -L$ANDROID_LIBS -Wl,-rpath-link,$ANDROID_LIBS -L$NDK/sources/cxx-stl/gnu-libstdc++/4.6/libs/$ABI -static-libstdc++" EXTRA_CXXFLAGS="-Wno-multichar -fno-exceptions -fno-rtti" FLAGS="$FLAGS --prefix=$DEST" mkdir -p $DEST echo $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" --extra-cxxflags="$EXTRA_CXXFLAGS" > $DEST/info.txt ./configure $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" --extra-cxxflags="$EXTRA_CXXFLAGS" | tee $DEST/configuration.txt [ $PIPESTATUS == 0 ] || exit 1 make clean #make -j4 || exit 1 #make -j4 make install || exit 1 
  1. 将编译好的include和lib目录复制到我的android-ndk-r7 / sources / ffmpeg-2.1.4 / android / arm目录下。 这个目录下的Android.mk文件是。

    LOCAL_PATH:= $(call my-dir)

    包括$(CLEAR_VARS)LOCAL_MODULE:= libavcodec LOCAL_SRC_FILES:= lib / libavcodec-55.so LOCAL_EXPORT_C_INCLUDES:= $(LOCAL_PATH)/ include include $(PREBUILT_SHARED_LIBRARY)

    包括$(CLEAR_VARS)LOCAL_MODULE:= libavformat LOCAL_SRC_FILES:= lib / libavformat-55.so LOCAL_EXPORT_C_INCLUDES:= $(LOCAL_PATH)/ include include $(PREBUILT_SHARED_LIBRARY)

    包括$(CLEAR_VARS)LOCAL_MODULE:= libswscale LOCAL_SRC_FILES:= lib / libswscale-2.so LOCAL_EXPORT_C_INCLUDES:= $(LOCAL_PATH)/ include include $(PREBUILT_SHARED_LIBRARY)

    包括$(CLEAR_VARS)LOCAL_MODULE:= libavutil LOCAL_SRC_FILES:= lib / libavutil-52.so LOCAL_EXPORT_C_INCLUDES:= $(LOCAL_PATH)/ include include $(PREBUILT_SHARED_LIBRARY)

    包括$(CLEAR_VARS)LOCAL_MODULE:= libavfilter LOCAL_SRC_FILES:= lib / libavfilter-3.so LOCAL_EXPORT_C_INCLUDES:= $(LOCAL_PATH)/ include include $(PREBUILT_SHARED_LIBRARY)

    包括$(CLEAR_VARS)LOCAL_MODULE:= libwsresample LOCAL_SRC_FILES:= lib / libswresample-0.so LOCAL_EXPORT_C_INCLUDES:= $(LOCAL_PATH)/ include include $(PREBUILT_SHARED_LIBRARY)

  2. 在我的android应用程序的jni目录下,Android.mk是。

     LOCAL_PATH:= $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := libripple #LOCAL_CFLAGS := -Werror LOCAL_SRC_FILES := entrypoint.cpp scene.cpp LOCAL_LDLIBS := -llog -lGLESv2 -lm include $(BUILD_SHARED_LIBRARY) include $(CLEAR_VARS) LOCAL_MODULE := myfflib LOCAL_SRC_FILES := fflib.c LOCAL_LDLIBS := -L/home/mingzhang/ffmpeg_android/android-libs -llog -ljnigraphics -lz -landroid -ldl -lm -llog -lgcc -lc -lstagefright -lmedia -lutils -lbinder #-lstdc++ LOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil libutils libstagefright libbinder libmedia libstdc++-6 include $(BUILD_SHARED_LIBRARY) $(call import-module,ffmpeg-2.1.4/android/arm) 

    而Application.mk是:

     APP_ABI=armeabi-v7a #APP_STL=gnustl_static APP_STL=stlport_static 

我不知道你还需要什么材料,如果有什么遗漏,请让我知道,我会上传它。 非常感谢你们!

Solutions Collecting From Web of "FFmpeg支持libstagefright硬件解码"

FFmpeg在https://github.com/FFmpeg/FFmpeg/commit/72673ad7eae2d4f685f3c0a895558502bfe07c8e (包含在n3.0 )中删除了对libstagefright的支持。 提交消息:

 avcodec: Remove libstagefright It serves absolutely no purpose other than to confuse potentional Android developers about how to use hardware acceleration properly on the the platform. The stagefright "API" is not public, and the MediaCodec API is the proper way to do this. Furthermore, stagefright support in avcodec needs a series of magic incantations and version-specific stuff, such that using it actually provides downsides compared just using the actual Android frameworks properly, in that it is a lot more work and confusion to get it even running. It also leads to a lot of misinformation, like these sorts of comments (in [1]) that are absolutely incorrect. [1] http://stackoverflow.com/a/29362353/3115956 

所以也许这是不可能的了。

AMediaCodec和OpenMAX可能会有更好的机会。