android - 如何在 Android Studio (ver 2.1.2) 上构建 FFmpeg (ver 3.1.1)

Question

我尝试在 Android Studio 上构建和使用 FFmpeg 库。
我的环境
Windows 7 64 位、Cygwin64、Android Studio 2.1.2、FFmpeg 3.1.1、Android NDK r12b
引用。页
http://www.roman10.net/2013/08/18/how-to-build-ffmpeg-with-ndk-r9/我关注这个页面。
我在 Cygwin 上使用 ./build_android.sh 成功构建了 FFmpeg 库
所以我尝试在 Android Studio 上使用 FFmpeg 库。
设置 Android Studio 以使用 FFmpeg
我的项目路径/jni/Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE := ffmpeg_trim
LOCAL_SRC_FILES := ffmpeg_trim.c

LOCAL_LDLIBS := -lz -ljnigraphics

LOCAL_SHARED_LIBRARIES := libavformat libavcodec libavutil libswscale libswresample

LOCAL_EXPORT_C_INCLUDES := ($LOCAL_PATH)/include

include $(BUILD_SHARED_LIBRARY)

$(call import-module,ffmpeg-3.1.1/android/arm)

我的 jni/Application.mk APP_ABI := armeabi-v7a 我的项目路径/jni/ffmpeg_trim.c

#include "my_package_util_TrimUtil.h"
#include <libavformat/avformat.h>

JNIEXPORT void JNICALL
Java_my_package_videoeditor_util_TrimUtil_registerAll(JNIEnv *env, jobject obj)
{
    av_register_all();
}

我的项目路径/jni/ffmpeg_trim.h

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class my_package_videoeditor_util_TrimUtil */

#ifndef _Included_my_package_videoeditor_util_TrimUtil
#define _Included_my_package_videoeditor_util_TrimUtil
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     my_package_videoeditor_util_TrimUtil
 * Method:    registerAll
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_my_package_util_TrimUtil_registerAll
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

我的项目路径/build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "24.0.0"

    defaultConfig {
        applicationId "my.package.videoeditor"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
        mp4parser {
            applicationIdSuffix ".mp4parser"
        }
        ffmpeg {
            applicationIdSuffix ".ffmpeg"
            ndk {
                moduleName "ffmpeg_trim"
                cFlags "-std=c99 -I${project.buildDir}/../src/ffmpeg/jni/include"
            }

            sourceSets.main {
                jni.srcDirs = []
                jniLibs.srcDir 'src/ffmpeg/libs'
            }
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.googlecode.mp4parser:isoparser:1.1.21'
}

我的 project_path/jni 文件夹

我建立我的项目。
但是，失败并打印此消息。

我无法解决我的问题。如何在 Android Studio 上构建和使用 FFmpeg 库。
不要告诉我其他使用 FFmpeg 的库。

Answer 1

我从来没有在 Android Studio 本身中构建过 ffmpeg，我使用原生构建来将库和头文件安装在自己的目录中以供使用。

这是我的构建脚本，它启用了 gpl，因此我可以访问 yadif deinterlace 过滤器:

#!/bin/bash

NDK=$HOME/Android/Sdk/ndk-bundle
SYSROOT=$NDK/platforms/android-19/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
CPREFIX=$TOOLCHAIN/bin/arm-linux-androideabi-

function build_it {
./configure \
    --prefix=$PREFIX    \
    --disable-static    \
    --enable-shared     \
    --disable-doc       \
    --disable-ffmpeg    \
    --disable-ffplay    \
    --disable-ffprobe   \
    --disable-ffserver  \
    --disable-avdevice  \
    --disable-doc       \
    --disable-symver    \
    --cross-prefix=$CPREFIX \
    --target-os=linux   \
    --arch=arm      \
    --enable-cross-compile  \
    --enable-gpl        \
    --sysroot=$SYSROOT  \
    --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
    --extra-ldflags="$ADDI_LDFLAGS" \
    $ADDITIONAL_CONFIGURE_FLAG
    make clean
    make
    make install
}

CPU=arm
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-marm"

build_it

我在 Android Studio 中的 gradle 脚本可能会帮助您启动并运行:

apply plugin: 'com.android.model.application'

model {
    android {
        def ffmpeg = "src/main/android/armeabi-v7a/include"

        buildToolsVersion "23.0.1"
        compileSdkVersion 23

        defaultConfig.with {
            minSdkVersion.apiLevel = 19
        }

        ndk {
            moduleName = "ffplayer2jni"

            ldLibs.addAll("log", "android", "GLESv2", "dl", "atomic", "EGL",
                    "z", "stdc++", "OpenSLES")

            cppFlags.addAll("-std=c++11", "-fexceptions", '-I'+file(ffmpeg),
                    "-D __cplusplus=201103L", "-frtti",
                    "-D __GXX_EXPERIMENTAL_CXX0X__")
            CFlags.add('-I'+file(ffmpeg))

            stl = "gnustl_static"
            //stl = "stlport_shared"

            abiFilters.addAll("armeabi-v7a")
        }
    }

    android.buildTypes {
        release {
            minifyEnabled false
            proguardFiles.add(file('proguard-android.txt'))
        }
    }

    repositories {
        def loc = "src/main/jniLibs/armeabi-v7a/"

        libs(PrebuiltLibraries) {

            libavutil {
                binaries.withType(SharedLibraryBinary) {
                    sharedLibraryFile = file(loc + "libavutil.so")
                }
            }

            libavcodec {
                binaries.withType(SharedLibraryBinary) {
                    sharedLibraryFile = file(loc + "libavcodec.so")
                }
            }

            libavformat {
                binaries.withType(SharedLibraryBinary) {
                    sharedLibraryFile = file(loc + "libavformat.so")
                }
            }

            libavfilter {
                binaries.withType(SharedLibraryBinary) {
                    sharedLibraryFile = file(loc + "libavfilter.so")
                }
            }

            libpostproc {
                binaries.withType(SharedLibraryBinary) {
                    sharedLibraryFile = file(loc + "libpostproc.so")
                }
            }

            libswresample {
                binaries.withType(SharedLibraryBinary) {
                    sharedLibraryFile = file(loc + "libswresample.so")
                }
            }

            libswscale {
                binaries.withType(SharedLibraryBinary) {
                    sharedLibraryFile = file(loc + "libswscale.so")
                }
            }
        }
    }

    android.sources {
        main {
            jni {
                dependencies {
                    library "libavformat" linkage "shared"
                    library "libavcodec" linkage "shared"
                    library "libavfilter" linkage "shared"
                    library "libavutil" linkage "shared"
                    library "libswscale" linkage "shared"
                    library "libswresample" linkage "shared"
                    library "libpostproc" linkage "shared"
                }
            }
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.3.0'
}

编辑:在 cpp 项目中包括标题

#define __STDC_LIMIT_MACROS
#define __STDC_CONSTANT_MACROS

#ifndef INT64_C
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif

#ifdef __cplusplus
extern "C" {
#endif

#include <libavutil/frame.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libavutil/pixfmt.h"
#include "libavutil/mathematics.h"
#include "libavutil/samplefmt.h"
#include "libavfilter/avfilter.h"
#include "libavfilter/avfiltergraph.h"
#ifdef __cplusplus
}
#endif

#include <string>
#include <list>
#include <vector>

#include "pthread.h"
#include "sched.h"
#include "unistd.h"
#include "stdio.h"
#include "time.h"