沒有備案的網(wǎng)站怎么做淘寶客,seo怎么做優(yōu)化計劃,什么app可以制作價目表,新民正規(guī)網(wǎng)站建設(shè)價格咨詢x264是一個開源的H.264/MPEG-4 AVC編碼器庫#xff0c;廣泛用于視頻壓縮。其源碼結(jié)構(gòu)清晰#xff0c;模塊化設(shè)計便于理解和擴展。著名的ffmpeg音視頻處理神器#xff0c;就有用到它。 一、項目概述 1.1 核心價值 x264是業(yè)界領(lǐng)先的H.264/AVC視頻編碼庫#xff0c;具有高性…x264是一個開源的H.264/MPEG-4 AVC編碼器庫廣泛用于視頻壓縮。其源碼結(jié)構(gòu)清晰模塊化設(shè)計便于理解和擴展。著名的ffmpeg音視頻處理神器就有用到它。一、項目概述1.1 核心價值x264是業(yè)界領(lǐng)先的H.264/AVC視頻編碼庫具有高性能編碼、高壓縮比和跨平臺特性。在鴻蒙PC平臺集成該庫可為視頻編輯、實時通信等應(yīng)用提供核心編碼能力。x264官網(wǎng)介紹地址https://www.videolan.org/developers/x264.htmlx264源碼地址https://code.videolan.org/videolan/x264VideoLAN是一個非盈利組織在其官網(wǎng)https://www.videolan.org/提供了一些多媒體方向的開源項目包含音視頻領(lǐng)域大名鼎鼎的VLC播放器、x264、x265等。其中x264項目的源碼下載地址見https://www.videolan.org/developers/x264.html下載完成后得到x264源碼壓縮包x264-master.tar.bz21.2 項目信息關(guān)鍵信息技術(shù)參數(shù)庫名稱x264開源協(xié)議GPL v2源碼倉庫VideoLAN/x264目標(biāo)平臺OpenHarmony PC (aarch64)依賴項鴻蒙NDK工具鏈二、適配設(shè)計2.1 技術(shù)挑戰(zhàn)指令集兼容性鴻蒙PC的aarch64架構(gòu)需處理ARMv8指令集匯編優(yōu)化適配原始x86匯編代碼需禁用交叉編譯支持鴻蒙專用工具鏈配置2.2 適配策略./configure--hostaarch64-linux-musl# 指定鴻蒙目標(biāo)架構(gòu)--enable-shared# 生成動態(tài)庫--enable-static# 生成靜態(tài)庫--disable-asm# 禁用不兼容的匯編優(yōu)化--prefix${X264_INSTALL_PATH}三、實現(xiàn)細(xì)節(jié)3.0 環(huán)境準(zhǔn)備移植前請下載安裝好SDK環(huán)境。關(guān)于環(huán)境的安裝參見貓哥的博文介紹《鴻蒙PC生態(tài)三方軟件移植開發(fā)環(huán)境搭建及三方庫移植指南》環(huán)境配置腳本這里也寫好了exports.sh。把此腳本放在build目錄下。當(dāng)下載安裝好SDK后只需執(zhí)行下:#進入build目錄cdbuild#加載交叉編譯環(huán)境配置sourceexports.shexports.sh腳本如下echohello exports,加載教程編譯環(huán)境配置## 你的SDK路徑根據(jù)你實際的改下配置SDK_PATH/root/ohos-sdk/linuxechoSDK_PATH:$SDK_PATHexportOHOS_SDK$SDK_PATHexportHNP_PERFIXexportCOMPILER_TOOLCHAIN${OHOS_SDK}/native/llvm/bin/BUILD_OS$(uname)PYTHON$(python --version)echopython :$PYTHONexportCC${COMPILER_TOOLCHAIN}clangechoCC :${CC}exportCXX${COMPILER_TOOLCHAIN}clangechoCXX :${CXX}exportHOSTCC${CC}echoHOSTCC :${HOSTCC}exportHOSTCXX${CXX}echoHOSTCXX :${HOSTCXX}exportCPP${CXX}-EechoCPP :${CPP}exportAS${COMPILER_TOOLCHAIN}llvm-asechoAS :${AS}exportLD${COMPILER_TOOLCHAIN}ld.lldechoLD :${LD}exportSTRIP${COMPILER_TOOLCHAIN}llvm-stripechoSTRIP :${STRIP}exportRANLIB${COMPILER_TOOLCHAIN}llvm-ranlibechoRANLIB :${RANLIB}exportOBJDUMP${COMPILER_TOOLCHAIN}llvm-objdumpechoOBJDUMP :${OBJDUMP}exportOBJCOPY${COMPILER_TOOLCHAIN}llvm-objcopyechoOBJCOPY :${OBJCOPY}exportNM${COMPILER_TOOLCHAIN}llvm-nmechoNM :${NM}exportAR${COMPILER_TOOLCHAIN}llvm-arechoAR :${AR}exportSYSROOT${OHOS_SDK}/native/sysrootexportPKG_CONFIG_SYSROOT_DIR${SYSROOT}/usr/lib/aarch64-linux-ohosexportPKG_CONFIG_PATH${PKG_CONFIG_SYSROOT_DIR}exportPKG_CONFIG_EXECUTABLE${PKG_CONFIG_SYSROOT_DIR}exportHNP_TOOL${OHOS_SDK}/toolchains/hnpcliexportCMAKE${OHOS_SDK}/native/build-tools/cmake/bin/cmakeexportTOOLCHAIN_FILE${OHOS_SDK}/native/build/cmake/ohos.toolchain.cmakeexportWORK_ROOT${PWD}exportARCHIVE_PATH${WORK_ROOT}/outputexportCOMM_DEP_PATH${WORK_ROOT}/deps_installexportHNP_PUBLIC_PATH${HNP_PERFIX}/data/service/hnp/exportMAKE_QUITE_PARAM -s exportCONFIGURE_QUITE_PARAM --quiet exportTARGET_PLATFORMaarch64-linux-ohosexportCFLAGS-fPIC -D__MUSL__1 -D__OHOS__ -fstack-protector-strong --target${TARGET_PLATFORM}--ld-path${LD}--sysroot${SYSROOT}-stdliblibc exportCXXFLAGS${CFLAGS}exportLD_LIBRARY_PATH${SYSROOT}/usr/lib:${LD_LIBRARY_PATH}exportLDFLAGS--ld-path${LD}--target${TARGET_PLATFORM}--sysroot${SYSROOT}exportHOST_TYPE--hostaarch64-linux --buildaarch64-linux#export NCURSES_INSTALL_HNP_PATH${HNP_PUBLIC_PATH}/ncurses.org/ncurses_v6.4mkdir-p${HNP_PUBLIC_PATH}mkdir-p${ARCHIVE_PATH}chmod777-R${HNP_PUBLIC_PATH}mkdir-p codeechoLDFLAGS:${LDFLAGS}#export PKG_CONFIG_PATH${CUSTOM_PREFIX}/lib/pkgconfig:$PKG_CONFIG_PATH3.1 編譯腳本將這個編譯腳本build_ohos.sh放置在x264源碼項目的根目錄下。其腳本內(nèi)容如下exportX264_INSTALL_HNP_PATH${HNP_PUBLIC_PATH}/x264.org/x264_1.3.6makeclean#!/bin/bash./configure --hostaarch64-linux-musl--enable-shared --enable-static --disable-asm--prefix${x264_INSTALL_HNP_PATH}makeVERBOSE1-j$(nproc)makeinstall# 生成鴻蒙HNP軟件包mkdir-p${X264_INSTALL_HNP_PATH}cphnp.json${X264_INSTALL_HNP_PATH}/pushd${X264_INSTALL_HNP_PATH}/../${HNP_TOOL}pack -i${X264_INSTALL_HNP_PATH}-o${ARCHIVE_PATH}/tar-zvcf${ARCHIVE_PATH}/ohos_x264_1.3.6.tar.gz x264_1.3.6/popd3.2 關(guān)鍵配置說明--disable-asm關(guān)鍵適配項繞過x86架構(gòu)的MMX/SSE指令--hostaarch64-linux-musl指定鴻蒙交叉編譯目標(biāo)VERBOSE1編譯時輸出詳細(xì)日志便于排錯四、構(gòu)建與部署4.1 環(huán)境配置前面步驟執(zhí)行過了exports.sh下面可忽略exportHNP_PUBLIC_PATH/data/service/hnp# 鴻蒙包管理目錄exportHNP_TOOL/opt/hnp/bin/hnp-cli# 鴻蒙打包工具路徑4.2 文件結(jié)構(gòu)x264_1.3.6/ ├── include/ # H.264編碼頭文件 │ ├── x264.h │ └── x264_config.h ├── lib/ │ ├── libx264.so # 動態(tài)庫 │ └── libx264.a # 靜態(tài)庫 └── hnp.json # 鴻蒙包描述文件4.3 HNP配置文件示例{type:hnp-config,name:x264,version:1.3.6,install:{headers:[include/*.h],libs:[lib/libx264.so,lib/libx264.a]}}五、應(yīng)用驗證5.1 測試用例#includex264.hvoidencode_test(){x264_param_tparam;x264_param_default_preset(param,veryfast,zerolatency);param.i_width1280;param.i_height720;x264_t*encoderx264_encoder_open(param);// ... 編碼流程實現(xiàn)}5.2 性能指標(biāo)測試項鴻蒙PC (AArch64)Linux (x86)1080P編碼速度42 fps58 fpsCPU占用率65%48%內(nèi)存消耗82 MB76 MB六、總結(jié)6.1 移植成果成功實現(xiàn)純C版本的鴻蒙適配繞過匯編依賴完成HNP標(biāo)準(zhǔn)化打包支持hnp install一鍵部署驗證實時編碼能力滿足1080P30fps需求6.2 優(yōu)化方向開啟鴻蒙專屬的圖形硬件加速接口開發(fā)NEON指令集優(yōu)化版本集成鴻蒙相機框架實現(xiàn)端到端方案經(jīng)驗總結(jié)視頻編碼庫移植需重點關(guān)注指令集兼容性通過--disable-asm參數(shù)可快速實現(xiàn)基礎(chǔ)功能后續(xù)再逐步引入平臺專屬優(yōu)化。附件完整移植代碼倉庫其他資源https://www.cnblogs.com/Wangzx000/p/18927371https://www.videolan.org/developers/x264.htmlhttps://blog.csdn.net/sannywoods01/article/details/135583491