FFmpeg编译4.1.4并移植到Android

FFmpeg编译4.1.4并移植到Android

在我们开发音视频的过程中,总是避免不了对音视频的操作,对音视频的操作最常用的就是FFmpeg了,但是有一个问题就是不能直接使用,所以得进行编译才能在移动端使用,下面就给大家介绍如何在Android中编译FFmpeg

Android 编译FFmpeg

我们编译FFmpeg一般在Linux的系统上进行编译,当然windows也是可以的,这里讲解一下在Linux系统上编译。

  1. 从官网下载FFmpeg(文档编辑时版本 ffmpeg-4.1.4)
  2. 将下载下来的ffmpeg进行解压
  3. 去Android官网下载ndk(文档编辑时版本 ndk-14b)
  4. 进入已解压的ffmpeg文件目录,修改configure文件
SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'

替换成

SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB)"$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'
  1. 编写build_android.sh的可执行文件
#!/bin/bash
# 清空上次的编译
make clean
#你自己的NDK路径.
export NDK=/home/anjoiner/Documents/AnJoiner/ffmpeg/ndk
function build_android
{
echo "Compiling FFmpeg for $CPU"
./configure \
--prefix=$PREFIX \
--enable-neon \
--enable-hwaccels \
--enable-gpl \
--enable-postproc \
--enable-shared \
--enable-jni \
--enable-mediacodec \
--enable-decoder=h264_mediacodec \
--disable-static \
--disable-doc \
--enable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--enable-avdevice \
--disable-doc \
--disable-symver \
--cross-prefix=$CROSS_PREFIX \
--target-os=android \
--arch=$ARCH \
--cpu=$CPU \
--enable-cross-compile \
--sysroot=$SYSROOT \
--extra-cflags="-Os -fpic $OPTIMIZE_CFLAGS" \
--extra-ldflags="$ADDI_LDFLAGS" \
$ADDITIONAL_CONFIGURE_FLAG
make clean
make
make install
echo "The Compilation of FFmpeg for $CPU is completed"
}

#armv8-a
ARCH=arm64
CPU=armv8-a
TOOLCHAIN=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64
SYSROOT=$NDK/platforms/android-21/arch-$ARCH/
CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=$CPU"
build_android

#armv7-a
ARCH=arm
CPU=armv7-a
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
SYSROOT=$NDK/platforms/android-21/arch-$ARCH/
CROSS_PREFIX=$TOOLCHAIN/bin/arm-linux-androideabi-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
build_android

#x86
ARCH=x86
CPU=x86
TOOLCHAIN=$NDK/toolchains/x86-4.9/prebuilt/linux-x86_64
SYSROOT=$NDK/platforms/android-21/arch-$ARCH/
CROSS_PREFIX=$TOOLCHAIN/bin/i686-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"
build_android

#x86_64
ARCH=x86_64
CPU=x86-64
TOOLCHAIN=$NDK/toolchains/x86_64-4.9/prebuilt/linux-x86_64
SYSROOT=$NDK/platforms/android-21/arch-$ARCH/
CROSS_PREFIX=$TOOLCHAIN/bin/x86_64-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=$CPU -msse4.2 -mpopcnt -m64 -mtune=intel"
build_android

注意:当执行./build_android.sh的时候,出现权限不足,那么一定要给这个文件添加可执行权限

chmod 777 build_android.sh

这样就可以进行编译生成Android下的ffmpeg

如果在编译的时候出现如下问题:

ffbuild/common.mak:60: recipe for target 'libavformat/udp.o' failed
make: *** [libavformat/udp.o] Error 1

libavformat/udp.c 第290~295行进行注释

//         mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
// if (local_addr)
// mreqs.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
// else
// mreqs.imr_interface.s_addr= INADDR_ANY;
// mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)&sources[i])->sin_addr.s_addr;

这样之后,基本就是ok的,在我们ffmpeg的文件夹下,会生成一个ffmpeg/android/armv7-a的文件目录,里面内容如下:

将编译后的ffmpeg移植到Android

准备

  • 在任何地方新建一个jni的文件夹。
  • 将我们刚刚编译的ffmpeg/android/armv7-a/include下的所有文件拷贝进入jni文件夹。
  • jni下新建一个prebuilt的文件夹,将ffmpeg/android/armv7-a/lib下的so文件全部拷贝到prebuilt之下。
  • 然后将ffmpeg/fftools文件下的如下文件拷贝进入jni
    • cmdutils.c
    • cmdutils.h
    • config.h
    • ffmpeg_filter.c
    • ffmpeg_hw.c
    • ffmpeg_opt.c
    • ffmpeg.c
    • ffmpeg.h

修改ffmpeg文件

  • 修改刚刚拷贝的ffmpeg.c文件,找到int main(int argc, char **argv)函数,将其替换为int run(int argc, char **argv)

  • 在修改后的run(int argc, char **argv) 末尾(retrun 之前)加上如上如下代码:

    nb_filtergraphs = 0;
    progress_avio = NULL;

    input_streams = NULL;
    nb_input_streams = 0;
    input_files = NULL;
    nb_input_files = 0;

    output_streams = NULL;
    nb_output_streams = 0;
    output_files = NULL;
    nb_output_files = 0;
  • 并在ffmpeg.h文件末尾加上

    int run(int argc, char **argv);
  • 再次打开ffmpeg.c文件,注释掉run(int argc, char **argv)下的所有exit_program函数,大致代码如下:

    int run(int argc, char **argv)
    {
    int i, ret;
    BenchmarkTimeStamps ti;

    init_dynload();

    register_exit(ffmpeg_cleanup);

    setvbuf(stderr,NULL,_IONBF,0); /* win32 runtime needs this */

    av_log_set_flags(AV_LOG_SKIP_REPEATED);
    parse_loglevel(argc, argv, options);

    if(argc>1 && !strcmp(argv[1], "-d")){
    run_as_daemon=1;
    av_log_set_callback(log_callback_null);
    argc--;
    argv++;
    }

    #if CONFIG_AVDEVICE
    avdevice_register_all();
    #endif
    avformat_network_init();

    show_banner(argc, argv, options);

    /* parse options and open all input/output files */
    ret = ffmpeg_parse_options(argc, argv);
    if (ret < 0);
    // exit_program(1);

    if (nb_output_files <= 0 && nb_input_files == 0) {
    show_usage();
    av_log(NULL, AV_LOG_WARNING, "Use -h to get full help or, even better, run 'man %s'\n", program_name);
    // exit_program(1);
    }

    /* file converter / grab */
    if (nb_output_files <= 0) {
    av_log(NULL, AV_LOG_FATAL, "At least one output file must be specified\n");
    // exit_program(1);
    }

    // if (nb_input_files == 0) {
    // av_log(NULL, AV_LOG_FATAL, "At least one input file must be specified\n");
    // exit_program(1);
    // }

    for (i = 0; i < nb_output_files; i++) {
    if (strcmp(output_files[i]->ctx->oformat->name, "rtp"))
    want_sdp = 0;
    }

    current_time = ti = get_benchmark_time_stamps();
    if (transcode() < 0);
    // exit_program(1);
    if (do_benchmark) {
    int64_t utime, stime, rtime;
    current_time = get_benchmark_time_stamps();
    utime = current_time.user_usec - ti.user_usec;
    stime = current_time.sys_usec - ti.sys_usec;
    rtime = current_time.real_usec - ti.real_usec;
    av_log(NULL, AV_LOG_INFO,
    "bench: utime=%0.3fs stime=%0.3fs rtime=%0.3fs\n",
    utime / 1000000.0, stime / 1000000.0, rtime / 1000000.0);
    }
    av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" frames successfully decoded, %"PRIu64" decoding errors\n",
    decode_error_stat[0], decode_error_stat[1]);
    if ((decode_error_stat[0] + decode_error_stat[1]) * max_error_rate < decode_error_stat[1]);
    // exit_program(69);

    // exit_program(received_nb_signals ? 255 : main_return_code);

    nb_filtergraphs = 0;
    progress_avio = NULL;

    input_streams = NULL;
    nb_input_streams = 0;
    input_files = NULL;
    nb_input_files = 0;

    output_streams = NULL;
    nb_output_streams = 0;
    output_files = NULL;
    nb_output_files = 0;


    return main_return_code;
    }

    新建ffmpeg-invoke

jni文件下新建一个ffmpeg-invoke.cpp的c++文件,将如下代码写入

#include <jni.h>
#include <string.h>
#include "android/log.h"

#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, "ffmpeg-invoke", __VA_ARGS__)

extern "C"{
#include "ffmpeg.h"
#include "libavcodec/jni.h"
}

extern "C"
JNIEXPORT jint JNICALL
Java_com_coder_ffmpeg_jni_FFmpegCmd_run(JNIEnv *env, jclass type, jint cmdLen,
jobjectArray cmd) {
//set java vm
JavaVM *jvm = NULL;
env->GetJavaVM(&jvm);
av_jni_set_java_vm(jvm, NULL);

char *argCmd[cmdLen] ;
jstring buf[cmdLen];

for (int i = 0; i < cmdLen; ++i) {
buf[i] = static_cast<jstring>(env->GetObjectArrayElement(cmd, i));
char *string = const_cast<char *>(env->GetStringUTFChars(buf[i], JNI_FALSE));
argCmd[i] = string;
LOGD("argCmd=%s",argCmd[i]);
}

int retCode = run(cmdLen, argCmd);
LOGD("ffmpeg-invoke: retCode=%d",retCode);

return retCode;

}

需注意的是 Java_com_coder_ffmpeg_jni_FFmpegCmd_runcom_coder_ffmpeg_jni表示FFmpegCmd所在你Android项目的位置。

新建Android.mk

jni文件夹下,新建Android.mk的文件,将如下代码拷贝,但是需要注意的是将 LOCAL_C_INCLUDES路径替换成你源码所在位置。

// 将此处的路径改为你ffmepg源码所在位置
LOCAL_C_INCLUDES := /home/anjoiner/Documents/AnJoiner/ffmpeg
LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := libavdevice
LOCAL_SRC_FILES := prebuilt/libavdevice.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libavutil
LOCAL_SRC_FILES := prebuilt/libavutil.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libswresample
LOCAL_SRC_FILES := prebuilt/libswresample.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libswscale
LOCAL_SRC_FILES := prebuilt/libswscale.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libavcodec
LOCAL_SRC_FILES := prebuilt/libavcodec.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libavformat
LOCAL_SRC_FILES := prebuilt/libavformat.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libavfilter
LOCAL_SRC_FILES := prebuilt/libavfilter.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libpostproc
LOCAL_SRC_FILES := prebuilt/libpostproc.so
include $(PREBUILT_SHARED_LIBRARY)


include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg-invoke

LOCAL_SRC_FILES :=ffmpeg-invoke.cpp \
cmdutils.c \
ffmpeg_filter.c \
ffmpeg_opt.c \
ffmpeg_hw.c \
ffmpeg.c

// 将此处的路径改为你ffmepg源码所在位置
LOCAL_C_INCLUDES := /home/anjoiner/Documents/AnJoiner/ffmpeg

LOCAL_LDLIBS := -llog -ljnigraphics -lz -landroid -lm -pthread -L$(SYSROOT)/usr/lib
LOCAL_SHARED_LIBRARIES := libavdevice libavcodec libavfilter libavformat libavutil libswresample libswscale libpostproc

include $(BUILD_SHARED_LIBRARY)

新建Application.mk

jni文件夹下,新建Application.mk并将如下代码拷贝进入

APP_ABI := armeabi-v7a
APP_PLATFORM := android-21
APP_OPTIM := release
APP_STL := stlport_static

到此基本上的配置已经完成,然后在jni文件下运行ndk-build

/home/anjoiner/Documents/AnJoiner/build/jni# /home/anjoiner/Documents/AnJoiner/ffmpeg/ndk/ndk-build

当出现如下代码就表示成功了

[armeabi-v7a] SharedLibrary  : libffmpeg-invoke.so
[armeabi-v7a] Install : libffmpeg-invoke.so => libs/armeabi-v7a/libffmpeg-invoke.so
[armeabi-v7a] Install : libpostproc.so => libs/armeabi-v7a/libpostproc.so
[armeabi-v7a] Install : libswresample.so => libs/armeabi-v7a/libswresample.so
[armeabi-v7a] Install : libswscale.so => libs/armeabi-v7a/libswscale.so

测试

  • 新建一个支持C++项目,注意包名需是上述ava_com_coder_ffmpeg_jni_FFmpegCmd_run中的com.coder.ffmpeg
  • jni的同级目录下,会生成一个libs的目录,将这个目录下的armeabi-v7a文件拷贝到你所在的Android项目中的app/src/main/jniLibs
  • 新建一个jni的文件目录,在此目录下新建一个FFmpegCmd
    /**
    * @author: AnJoiner
    * @datetime: 19-7-30
    */
    public class FFmpegCmd {
    static {
    System.loadLibrary("avdevice");
    System.loadLibrary("avutil");
    System.loadLibrary("avcodec");
    System.loadLibrary("swresample");
    System.loadLibrary("avformat");
    System.loadLibrary("swscale");
    System.loadLibrary("avfilter");
    System.loadLibrary("postproc");
    System.loadLibrary("ffmpeg-invoke");
    }

    private static native int run(int cmdLen, String[] cmd);

    public static int runCmd(String[] cmd){
    return run(cmd.length,cmd);
    }
    }

拷贝进来run方法名会出现红色,不用管他,

  • 在我们的MainActivity中进行调用,此方法是将音频进行剪切
public class MainActivity extends AppCompatActivity {

// Used to load the 'native-lib' library on application startup.
static {
System.loadLibrary("native-lib");
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
100);
}

// Example of a call to a native method
TextView tv = findViewById(R.id.sample_text);
tv.setText(stringFromJNI());

findViewById(R.id.btn_test).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ffmpegTest();
}
});
}

/**
* A native method that is implemented by the 'native-lib' native library,
* which is packaged with this application.
*/
public native String stringFromJNI();


private void ffmpegTest() {
new Thread() {
@Override
public void run() {
long startTime = System.currentTimeMillis();
String input =
Environment.getExternalStorageDirectory().getPath() + File.separator +
"DCIM" + File.separator + "test.mp3";
String output =
Environment.getExternalStorageDirectory().getPath() + File.separator +
"DCIM" + File.separator + "output.mp3";

String cmd = "ffmpeg -y -i %s -vn -acodec copy -ss %s -t %s %s";
String result = String.format(cmd, input, "00:00:30", "00:00:40", output);
FFmpegCmd.runCmd(result.split(" "));
Log.d("FFmpegTest", "run: 耗时:" + (System.currentTimeMillis() - startTime));
}
}.start();


}

如果上述步骤不出错,基本没什么问题,在资料的参考下,我也弄了好几天,但幸好结果还是好的~

使用 NDK-r20 编译FFmpeg

前面使用过老版本NDK-r14b编译FFmpeg,其实质是通过gcc去进行编译,但是最新的NDK版本中已经不使用gcc去编译,而是使用clang去进行编译.这里贴上最新配置文件代码

#!/bin/bash
# 清空上次的编译
make clean
#你自己的NDK路径.
export NDK=/home/anjoiner/Android/Sdk/ndk-bundle
TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64/
API=29

function build_android
{
echo "Compiling FFmpeg for $CPU"
./configure \
--prefix=$PREFIX \
--enable-neon \
--enable-hwaccels \
--enable-gpl \
--enable-postproc \
--enable-shared \
--enable-jni \
--enable-mediacodec \
--enable-decoder=h264_mediacodec \
--disable-static \
--disable-doc \
--enable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--enable-avdevice \
--disable-doc \
--disable-symver \
--cross-prefix=$CROSS_PREFIX \
--target-os=android \
--arch=$ARCH \
--cpu=$CPU \
--cc=$CC
--cxx=$CXX
--enable-cross-compile \
--sysroot=$SYSROOT \
--extra-cflags="-Os -fpic $OPTIMIZE_CFLAGS" \
--extra-ldflags="$ADDI_LDFLAGS" \
$ADDITIONAL_CONFIGURE_FLAG
make clean
make
make install
echo "The Compilation of FFmpeg for $CPU is completed"
}

#armv8-a
ARCH=arm64
CPU=armv8-a
CC=$TOOLCHAIN/bin/aarch64-linux-android$API-clang
CXX=$TOOLCHAIN/bin/aarch64-linux-android$API-clang++
SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot
CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=$CPU"
build_android

#armv7-a
ARCH=arm
CPU=armv7-a
CC=$TOOLCHAIN/bin/armv7a-linux-androideabi$API-clang
CXX=$TOOLCHAIN/bin/armv7a-linux-androideabi$API-clang++
SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot
CROSS_PREFIX=$TOOLCHAIN/bin/arm-linux-androideabi-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
build_android

#x86
ARCH=x86
CPU=x86
CC=$TOOLCHAIN/bin/i686-linux-android$API-clang
CXX=$TOOLCHAIN/bin/i686-linux-android$API-clang++
SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot
CROSS_PREFIX=$TOOLCHAIN/bin/i686-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"
build_android

#x86_64
ARCH=x86_64
CPU=x86-64
CC=$TOOLCHAIN/bin/x86_64-linux-android$API-clang
CXX=$TOOLCHAIN/bin/x86_64-linux-android$API-clang++
SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot
CROSS_PREFIX=$TOOLCHAIN/bin/x86_64-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=$CPU -msse4.2 -mpopcnt -m64 -mtune=intel"
build_android

参考资料

编译FFmpeg4.1.3并移植到Android app中使用(最详细的FFmpeg-Android编译教程)


 

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