Android Studio 整合FFmpeg

FFmpeg AndroidStudio · 發表 2018-10-13 11:48:27

摘要：先看效果圖 arm-v7a 我用的是FFmpeg4.02的版本，目前編譯出arm-v7a 和x86CPU架構的so檔案，如果需要可以編譯出全部平臺，不過目前移動端的已經足夠了。需要用到的有標頭檔案和對應架構的so檔案。首先得先弄懂CMak...

先看效果圖

arm-v7a

我用的是FFmpeg4.02的版本，目前編譯出arm-v7a 和x86CPU架構的so檔案，如果需要可以編譯出全部平臺，不過目前移動端的已經足夠了。需要用到的有標頭檔案和對應架構的so檔案。

首先得先弄懂CMake檔案的使用，如果不是理解的話，可以去官網檢視用法（地址： ofollow,noindex">https://developer.android.com/studio/projects/add-native-code ）

CMake檔案具體的描述

指定cmake的版本

cmake_minimum_required(VERSION 3.4.1)

可以把生成的so檔案指定到某個目錄下

set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})

生成so檔案（注意：一個CMake檔案只能生成一個so檔案，如果想生成多個so檔案，後期會寫出來怎麼做=。=！），這裡最好是跟對接的c檔案的名稱一樣，需要指定需要哪些需要參與的cpp檔案（如果你想增加附加c檔案的話，需要繼續增加引用就行）；SHARED表示生成的庫的動態連結

add_library( # Sets the name of the library.
zplay-lib

# Sets the library as a shared library.
SHARED

# Provides a relative path to your source file(s).
${CMAKE_SOURCE_DIR}/src/main/cpp/zplay-lib.cpp)

把對應的so檔案引入進來，set_target_properties：是設定對應的路徑

# 編解碼
 add_library(libavcodec
SHARED
IMPORTED)
 set_target_properties(libavcodec PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavcodec.so)
 # 和多媒體裝置互動的類庫
 add_library(libavdevice
SHARED
IMPORTED)
 set_target_properties(libavdevice PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavdevice.so)
 # 影象的pixel format處理
 add_library(libavfilter
SHARED
IMPORTED)
 set_target_properties(libavfilter PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavfilter.so)
 # 格式
 add_library(libavformat
SHARED
IMPORTED)
 set_target_properties(libavformat PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavformat.so)

 # 工具函式
 add_library(libavutil
SHARED
IMPORTED)
 set_target_properties(libavutil PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavutil.so)

 # 音訊重取樣，取樣格式轉換和混合庫
 add_library(libswresample
SHARED
IMPORTED)
 set_target_properties(libswresample PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswresample.so)

 # 縮放處理
 add_library(libswscale
SHARED
IMPORTED)
 set_target_properties(libswscale PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswscale.so)

再把標頭檔案的路徑也引進來

include_directories(
${CMAKE_SOURCE_DIR}/src/main/cpp/include/${ANDROID_ABI}
 )

最後再把這些資源全部關聯起來

target_link_libraries( # Specifies the target library.
zplay-lib

# Links the target library to the log library
# included in the NDK.
${log-lib}
libavcodec
libavdevice
libavfilter
libavformat
libavutil
libswresample
libswscale)

這是CMake檔案全部的程式碼

# For more information about using CMake with Android+Studio/">Android Studio, read the
 # documentation: https://d.android.com/studio/projects/add-native-code.html

 # Sets the minimum version of CMake required to build the native library.

 cmake_minimum_required(VERSION 3.4.1)

 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})

 # Specifies a library name, specifies whether the library is STATIC or
 # SHARED, and provides relative paths to the source code. You can
 # define multiple libraries by adding multiple add.library() commands,
 # and CMake builds them for you. When you build your app, Gradle
 # automatically packages shared libraries with your APK.

 add_library( # Sets the name of the library.
zplay-lib

# Sets the library as a shared library.
SHARED

# Provides a relative path to your source file(s).
${CMAKE_SOURCE_DIR}/src/main/cpp/zplay-lib.cpp
${CMAKE_SOURCE_DIR}/src/main/cpp/pcm/ZPcm2wav.cpp)


 # Specifies libraries CMake should link to your target library. You
 # can link multiple libraries, such as libraries you define in this
 # build script, prebuilt third-party libraries, or system libraries.

 target_link_libraries( # Specifies the target library.
zplay-lib

# Links the target library to the log library
# included in the NDK.
${log-lib}
libavcodec
libavdevice
libavfilter
libavformat
libavutil
libswresample
libswscale)


 # Searches for a specified prebuilt library and stores the path as a
 # variable. Because CMake includes system libraries in the search path by
 # default, you only need to specify the name of the public NDK library
 # you want to add. CMake verifies that the library exists before
 # completing its build.

 find_library( # Sets the name of the path variable.
log-lib

# Specifies the name of the NDK library that
# you want CMake to locate.
log)


 include_directories(
${CMAKE_SOURCE_DIR}/src/main/cpp/include/${ANDROID_ABI}
 )
 # 編解碼
 add_library(libavcodec
SHARED
IMPORTED)
 set_target_properties(libavcodec PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavcodec.so)
 # 和多媒體裝置互動的類庫
 add_library(libavdevice
SHARED
IMPORTED)
 set_target_properties(libavdevice PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavdevice.so)
 # 影象的pixel format處理
 add_library(libavfilter
SHARED
IMPORTED)
 set_target_properties(libavfilter PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavfilter.so)
 # 格式
 add_library(libavformat
SHARED
IMPORTED)
 set_target_properties(libavformat PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavformat.so)

 # 工具函式
 add_library(libavutil
SHARED
IMPORTED)
 set_target_properties(libavutil PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavutil.so)

 # 音訊重取樣，取樣格式轉換和混合庫
 add_library(libswresample
SHARED
IMPORTED)
 set_target_properties(libswresample PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswresample.so)

 # 縮放處理
 add_library(libswscale
SHARED
IMPORTED)
 set_target_properties(libswscale PROPERTIES IMPORTED_LOCATION
${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswscale.so)

再看下build.gradle檔案的相關配置

如果你是在非app module裡面的就需要增加

defaultConfig {

ndk {
abiFilters 'armeabi-v7a','x86'
}
}
packagingOptions {
pickFirst 'lib/armeabi-v7a/libzplay-lib.so'
pickFirst 'lib/x86/libzplay-lib.so'
}

最後顯示FFmpeg的配置資訊作為編譯成功的驗證

JNIEXPORT jstring
JNICALL
Java_com_zasko_ffmpeg_RenderManager_getConfig(JNIEnv *env, jclass type) {

char info[10000] = {0};
sprintf(info, "%s\n", avcodec_configuration());


return env->NewStringUTF(info);
}

具體的程式碼可以到Github上面參考

專案Demo連結

Android Studio 整合FFmpeg

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