无法端口FFmpeg的C库到安卓端口、FFmpeg、库到安卓

2023-09-05 04:49:22 作者：心中有梦闯天下

我到底要怎么办：访问 ffmpeg.c 文件来修改 INT主（INT ARGC，字符** argv的）函数的 JNI 并通过的ffmpeg的命令字符串。

What i exactly want to-do : Access the ffmpeg.c file to modify the int main(int argc, char **argv) function to JNI and passing the command of ffmpeg as string.

我试图端口的ffmpeg C库到Android（ARM处理器）。我跟着以下不同的方法来做到这一点。

I have tried to port ffmpeg C library to android(ARM processor). I followed following different ways to do this.

第一次尝试：用官方的ffmpeg的安装文档。操作步骤如下：

1st Try: using official ffmpeg installation documentation. Steps as follows

一）混帐混帐克隆：//source.ffmpeg.org/ffmpeg.git的ffmpeg

a) git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg

二）阅读INSTALL文件。

b) Read the INSTALL file.

C）下载X264库，并建立使用 build_x264.sh 它建立成功。

c) Download x264 library and build by using build_x264.sh which build successfully.

    NDK=/home/nav/Work/android/ndk
    PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt
    PLATFORM=$NDK/platforms/android-8/arch-arm
    PREFIX=/home/nav/28ffmpeg/android-ffmpeg                
    ./configure --prefix=$PREFIX --enable-static --enable-pic --disable-asm --disable-cli --host=arm-linux --cross-prefix=$PREBUILT/linux-x86/bin/arm-linux-androideabi- --sysroot=$PLATFORM
  make
  sudo make install
  sudo ldconfig

D）然后，我从（http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2)通过构建它的 build_android.sh

d) Then i download ffmpeg library from (http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2) build it by using build_android.sh

#!/bin/bash

NDK=/home/nav/Work/android/ndk
PLATFORM=$NDK/platforms/android-8/arch-arm
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
PREFIX=/home/nav/28ffmpeg/android-ffmpeg

function build_one
                {
                ./configure --target-os=linux --prefix=$PREFIX \
                --enable-cross-compile \
                --enable-runtime-cpudetect \
                --disable-asm \
                --arch=arm \
                --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
                --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
                --disable-stripping \
                --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
                --sysroot=$PLATFORM \
                --enable-nonfree \
                --enable-version3 \
                --disable-everything \
                --enable-gpl \
                --disable-doc \
                --enable-avresample \
                --enable-demuxer=rtsp \
                --enable-muxer=rtsp \
                --disable-ffplay \
                --disable-ffserver \
                --enable-ffmpeg \
                --disable-ffprobe \
                --enable-libx264 \
                --enable-encoder=libx264 \
                --enable-decoder=h264 \
                --enable-protocol=rtp \
                --enable-hwaccels \
                --enable-zlib \
                --disable-devices \
                --disable-avdevice \
--extra-cflags="-I/home/android-ffmpeg/include -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a" \
                --extra-ldflags="-L/home/android-ffmpeg/lib"
                make -j4 install

$PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
$PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$PREFIX/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavfilter/libavfilter.a libavresample/libavresample.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog -lx264 --warn-once --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
                }

                build_one

E）最初，它完美的作品。但是，错误后来了：

libavformat/libavformat.a(log2_tab.o):(.rodata+0x0): multiple definition of `ff_log2_tab'
libavcodec/libavcodec.a(log2_tab.o):(.rodata+0x0): first defined here
libavutil/libavutil.a(log2_tab.o):(.rodata+0x0): multiple definition of `ff_log2_tab'
libavcodec/libavcodec.a(log2_tab.o):(.rodata+0x0): first defined here
build_android.sh: 48: build_one: not found

结果： *的 libffmpeg.so 的*找不到

第二个尝试：然后我按照http://dl.dropbox.com/u/22605641/ffmpeg_android/main.html->构建

2nd Try: Then I follow steps in http://dl.dropbox.com/u/22605641/ffmpeg_android/main.html-> Builds

一）我下载了pre-生成的 libffmpeg.so 从上面的链接。

a) I downloaded Pre-Build libffmpeg.so from above link.

b）增加 libffmpeg.so 为库/ armeabi /

c）使 Android.mk

include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := libffmpeg.so
include $(PREBUILT_SHARED_LIBRARY)

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := main
LOCAL_STATIC_LIBRARIES += ffmpeg
LOCAL_SRC_FILES := ffmpeg-test.c
include $(BUILD_SHARED_LIBRARY)

D）然后，我做的所有NDK的建立和all.Copy ffmpeg.c 从库中的的ffmpeg-test.c的通过改变它的 INT主功能，我的 JNI 载体作用，并包括所有必要的包含文件。

d) Then I do all ndk set up and all.Copy ffmpeg.c from library to ffmpeg-test.c by changing its int main function to my JNI functin and include all necessary include files.

错误：

控制台：

  /home/nav/Work/android/ndk/ndk-build all 
Prebuilt       : libffmpeg.so <= jni/
Install        : libffmpeg.so => libs/armeabi/libffmpeg.so
Compile thumb  : main <= ffmpeg-test.c
jni/ffmpeg-test.c: In function 'print_report':
jni/ffmpeg-test.c:1139:94: warning: incompatible implicit declaration of built-in function 'log2' [enabled by default]
SharedLibrary  : libmain.so
/home/nav/Work/android/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/main/ffmpeg-test.o: in function check_keyboard_interaction:jni/ffmpeg-test.c:2496: error: undefined reference to 'qp_hist'

和许多其他未定义的引用.....

and many other undefined references.....

告诉我在哪里，我得到错误的。急需.....

Tell me where I am getting wrong. Needed Urgently.....

无法端口FFmpeg的C库到安卓端口、FFmpeg、库到安卓

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