FFmpeg编译4.1.4并移植到Android
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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。
- 从官网下载FFmpeg（文档编辑时版本 ffmpeg-4.1.4）
- 将下载下来的
ffmpeg进行解压 - 去Android官网下载ndk（文档编辑时版本 ndk-14b）
- 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) $(SLIBNAME)'复制代码
替换成
SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'LIB_INSTALL_EXTRA_CMD='?(RANLIB)"$(LIBDIR)/$(LIBNAME)"'SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'SLIB_INSTALL_LINKS='$(SLIBNAME)'复制代码
- 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/ndkfunction 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_FLAGmake clean
make
make installecho "The Compilation of FFmpeg for $CPU is completed"}#armv8-aARCH=arm64
CPU=armv8-aTOOLCHAIN=$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/$CPUOPTIMIZE_CFLAGS="-march=$CPU"build_android#armv7-aARCH=arm
CPU=armv7-aTOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
SYSROOT=$NDK/platforms/android-21/arch-$ARCH/
CROSS_PREFIX=$TOOLCHAIN/bin/arm-linux-androideabi-
PREFIX=$(pwd)/android/$CPUOPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "build_android#x86ARCH=x86
CPU=x86
TOOLCHAIN=$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/$CPUOPTIMIZE_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"build_android#x86_64ARCH=x86_64
CPU=x86-64
TOOLCHAIN=$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/$CPUOPTIMIZE_CFLAGS="-march=$CPU -msse4.2 -mpopcnt -m64 -mtune=intel"build_android复制代码注意：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复制代码
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复制代码
将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;复制代码
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。 - 在
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;复制代码
- 并在
ffmpeg.h文件末尾加上
int run(int argc, char **argv)；复制代码
- 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_AVDEVICEavdevice_register_all();#endifavformat_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;
}复制代码新建ffmpeg-invoke
在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;
}复制代码需注意的是 Java_com_coder_ffmpeg_jni_FFmpegCmd_run 中 com_coder_ffmpeg_jni表示FFmpegCmd所在你Android项目的位置。
新建Android.mk
在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复制代码
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)复制代码
新建Application.mk
在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复制代码
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复制代码
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复制代码
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。 - 在
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下 - 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);
}
}复制代码拷贝进来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();
}复制代码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
- 下载最新版本NDK-r20
- 下载FFmpeg-4.2.1
#!/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=29function 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_FLAGmake clean
make
make installecho "The Compilation of FFmpeg for $CPU is completed"}#armv8-aARCH=arm64
CPU=armv8-aCC=$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/$CPUOPTIMIZE_CFLAGS="-march=$CPU"build_android#armv7-aARCH=arm
CPU=armv7-aCC=$TOOLCHAIN/bin/armv7a-linux-androideabi$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=$(pwd)/android/$CPUOPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "build_android#x86ARCH=x86
CPU=x86
CC=$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/$CPUOPTIMIZE_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"build_android#x86_64ARCH=x86_64
CPU=x86-64
CC=$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/$CPUOPTIMIZE_CFLAGS="-march=$CPU -msse4.2 -mpopcnt -m64 -mtune=intel"build_android复制代码参考资料
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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