前言:最近 公司项目需要在电视上 播放摄像头视频,而且可以随时切换流,延时要求在500ms以内,网上试过了 各种开源库 ,都不能达到要求。于是自己找到公司C++开发人员请教,最后终于完成,在此记录,也给有需求的小伙伴提供方案。
第一步,添加ffmpeg的so库,网上有很多版本,后面我会在demo里面提供,然后这是我的CmakeList文件:
# For more information about using CMake with 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(pathToProject F:/androidProject/DuokuWelcome)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
src/main/cpp/native-lib.cpp )
add_library(avcodec-57 SHARED IMPORTED)
set_target_properties(avcodec-57 PROPERTIES
IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavcodec-57.so)
add_library(avdevice-57 SHARED IMPORTED)
set_target_properties(avdevice-57 PROPERTIES
IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavdevice-57.so)
add_library(avfilter-6 SHARED IMPORTED)
set_target_properties(avfilter-6 PROPERTIES
IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavfilter-6.so)
add_library(avformat-57 SHARED IMPORTED)
set_target_properties(avformat-57 PROPERTIES
IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavformat-57.so)
add_library(avutil-55 SHARED IMPORTED)
set_target_properties(avutil-55 PROPERTIES
IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavutil-55.so)
add_library(gperf SHARED IMPORTED)
set_target_properties(gperf PROPERTIES
IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libgperf.so)
add_library(swresample-2 SHARED IMPORTED)
set_target_properties(swresample-2 PROPERTIES
IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswresample-2.so)
add_library(swscale-4 SHARED IMPORTED)
set_target_properties(swscale-4 PROPERTIES
IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswscale-4.so)
include_directories(${pathToProject}/app/src/main/cpp/include/)
# 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