OpenHarmony 3.2 Release版本Codec HDI适配过程

2024-04-12 08:04
文章标签 过程 版本 3.2 codec release 适配 openharmony hdi

本文主要是介绍OpenHarmony 3.2 Release版本Codec HDI适配过程，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

简介

OpenHarmony Codec HDI（Hardware Device Interface）驱动框架基于 OpenMax 实现了视屏硬件编解码驱动，提供 Codec 基础能力接口供上层媒体服务调用，包括获取组件编解码能力、创建组件、参数设置、数据的轮转和控制、以及销毁组件等功能，实现对视频数据的编解码处理。

视频编解码驱动架构

Codec HDI 2.0 接口依赖 OpenMax IL 的标准接口。OMX Wrapper 将 OMX 接口的实现封装成 libOMX_Core.z.so 供 HDI 层调用。如果 codec 驱动为实现 OpenMax 标准接口，则需根据驱动适配实现 OMX Interface 接口。

Codec HDI 2.0 接口列表：

头文件接口名称功能描述
codec_component _manager.hint32_t (*GetComponentNum)();获取 Codec 编解码组件数量
int32_t (*GetComponentCapabilityList)(CodecCompCapability *capList, int32_t count);获取编解码能力集表
int32_t (*CreateComponent)(struct CodecComponentType **component, uint32_t *componentId, char *compName, int64_t appData, struct CodecCallbackType *callbacks);创建 Codec 组件实例
int32_t (*DestroyComponent)(uint32_t componentId);销毁组件实例
codec_component _if.hint32_t (*GetComponentVersion)(struct CodecComponentType *self, struct CompVerInfo *verInfo);获取 Codec 组件版本号
int32_t (*SendCommand)(struct CodecComponentType *self, enum OMX_COMMANDTYPE cmd, uint32_t param, int8_t *cmdData, uint32_t cmdDataLen);发送命令给组件
int32_t (*GetParameter)(struct CodecComponentType *self, uint32_t paramIndex, int8_t *paramStruct, uint32_t paramStructLen);获取组件参数设置
int32_t (*SetParameter)(struct CodecComponentType *self, uint32_t index, int8_t *paramStruct, uint32_t paramStructLen);设置组件需要的参数
int32_t (*GetConfig)(struct CodecComponentType *self, uint32_t index, int8_t *cfgStruct, uint32_t cfgStructLen);获取组件的配置结构
int32_t (*SetConfig)(struct CodecComponentType *self, uint32_t index, int8_t *cfgStruct, uint32_t cfgStructLen);设置组件的配置
int32_t (*GetExtensionIndex)(struct CodecComponentType *self, const char *paramName, uint32_t *indexType);根据字符串获取组件的扩展索引
int32_t (*GetState)(struct CodecComponentType *self, enum OMX_STATETYPE *state);获取组件的状态
int32_t (*ComponentTunnelRequest)(struct CodecComponentType *self, uint32_t port, int32_t tunneledComp, uint32_t tunneledPort, struct OMX_TUNNELSETUPTYPE *tunnelSetup);设置组件 Tunneled 方式通信
int32_t (*UseBuffer)(struct CodecComponentType *self, uint32_t portIndex, struct OmxCodecBuffer *buffer);指定组件端口的 buffer
int32_t (*AllocateBuffer)(struct CodecComponentType *self, uint32_t portIndex, struct OmxCodecBuffer *buffer);向组件申请端口 buffer
int32_t (*FreeBuffer)(struct CodecComponentType *self, uint32_t portIndex, const struct OmxCodecBuffer *buffer);释放 buffer
int32_t (*EmptyThisBuffer)(struct CodecComponentType *self, const struct OmxCodecBuffer *buffer);编解码输入待处理 buffer
int32_t (*FillThisBuffer)(struct CodecComponentType *self, const struct OmxCodecBuffer *buffer);编解码输出填充 buffer
int32_t (*SetCallbacks)(struct CodecComponentType *self, struct CodecCallbackType *callback, int64_t appData);设置 Codec 组件的回调函数
int32_t (*ComponentDeInit)(struct CodecComponentType *self);组件去初始化
int32_t (*UseEglImage)(struct CodecComponentType *self, struct OmxCodecBuffer *buffer, uint32_t portIndex, int8_t *eglImage, uint32_t eglImageLen);使用已在 ELG 中申请的空间
int32_t (*ComponentRoleEnum)(struct CodecComponentType *self, uint8_t *role, uint32_t roleLen, uint32_t index);获取组件角色
codec_callback_if.hint32_t (*EventHandler)(struct CodecCallbackType *self, enum OMX_EVENTTYPE event, struct EventInfo *info);事件上报
int32_t (*EmptyBufferDone)(struct CodecCallbackType *self, int64_t appData, const struct OmxCodecBuffer *buffer);上报输入 buffer 编码或者解码处理完毕
int32_t (*FillBufferDone)(struct CodecCallbackType *self, int64_t appData, const struct OmxCodecBuffer *buffer);上报输出 buffer 填充完毕

Codec HDI 相关目录接口

├── //drivers/peripheral/codec
│   ├── hal
│   │   ├── BUILD.gn
│   │   ├── idl_service
│   │   ├── include
│   │   ├── passthrough             # v2.0到v1.0的转换，v1.0接口已弃用，无需实现
│   │   ├── src
│   │   ├── v1.0                    # codec hdi v1.0接口的实现，已弃用，MediaService已不对接相关接口。
│   │   └── v2.0                    # codec hdi v2.0接口的实现，依赖OpenMax接口，需封装实现libOMX_Core.z.so
│   ├── hdi_service                 # codec_host相关实现
│   │   ├── BUILD.gn
│   │   ├── codec_proxy
│   │   ├── codec_service_stub
│   │   └── common
│   ├── interfaces
│   │   └── include
│   └── test

OMX_Core 相关接口

codec hdi V2.0 的实现依赖 libOMX_Core.z.so，需根据 OpenMax 标准接口封装实现。

参考 drivers/peripheral/codec/hal/v2.0/hdi_impl/include/codec_omx_core.h 的定义调用过程。

typedef OMX_ERRORTYPE (*InitFunc)();
typedef OMX_ERRORTYPE (*DeinitFunc)();
typedef OMX_ERRORTYPE (*ComponentNameEnumFunc)(OMX_STRING, OMX_U32, OMX_U32);
typedef OMX_ERRORTYPE (*GetHandleFunc)(OMX_HANDLETYPE *, OMX_STRING, OMX_PTR, OMX_CALLBACKTYPE *);
typedef OMX_ERRORTYPE (*FreeHandleFunc)(OMX_HANDLETYPE);
typedef OMX_ERRORTYPE (*GetRolesOfComponentFunc)(OMX_STRING, OMX_U32 *, OMX_U8 **);

HCS 配置

配置 codec_host 服务

./hdf_config/uhdf/device_info.hcs

codec :: host {hostName = "codec_host";priority = 50;gid = ["codec_host", "uhdf_driver", "vendor_mpp_driver"];codec_omx_device :: device {device0 :: deviceNode {policy = 2;priority = 100;moduleName = "libcodec_hdi_omx_server.z.so";serviceName = "codec_hdi_omx_service";deviceMatchAttr = "media_codec_capabilities";}}
}

配置 codec_capabilities

根据 codec::host 中配置的 deviceMatchAttr，配置 hdf.hcs

./hdf_config/uhdf/hdf.hcs

#include "media_codec_capabilitie.hcs"

参考 media_codec_capabilitie.hcs

root {module = "master";codec_config {match_attr = "media_codec_capabilities";use_openmax = true;// capsMask: 0x01, Adaptive playback; 0x02, Secure playback; 0x04, Tunnel playback.// allocateMask: 0x01, Input buffer allocated within the Codec module;// allocateMask: 0x02, Input buffer allocated by an external user;// allocateMask: 0x04, Output buffer allocated within the Codec module;// allocateMask: 0x08, Output buffer allocated by an external user.
​VideoHwEncoders {/* node name explanation -- HDF_video_hw_enc_avc_rk：****    HDF____________video__________________hw____________________enc____________avc_______rk**     |               |                    |                      |              |        |** HDF or OMX    video or audio    hardware or software    encoder or decoder    mime    vendor*/HDF_video_hw_enc_avc_rk {role = 1;type = 1;name = "OMX.rk.video_encoder.avc";supportProfiles = [1, 32768, 2, 32768, 8, 32768];maxInst = 4;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 40000000;minWidth = 176;minHeight = 144;maxWidth = 1920;maxHeight = 1088;widthAlignment = 16;heightAlignment = 8;minBlockCount = 99;maxBlockCount = 8160;minBlocksPerSecond = 99;maxBlocksPerSecond = 489600;blockSizeWidth = 16;blockSizeHeight = 16;supportPixelFmts = [28, 24, 20, 12];measuredFrameRate = [320, 240, 165, 165, 720, 480, 149, 149, 1280, 720, 73, 73, 1920, 1080, 18, 18];bitRateMode = [1, 2];minFrameRate = 1;maxFrameRate = 60;}..................}
}

RK3568 的参考适配过程

OMX Wrapper 的封装

根据 gn 文件：//drivers/peripheral/codec/BUILD.gn

OMX_IL_PATH = rebase_path("//device/soc/${device_company}/${product_name}/hardware/omx_il")cmd = "if [ -f ${OMX_IL_PATH}/BUILD.gn ]; then echo true; else echo false; fi"HAVE_OMX_IL_PATH =exec_script("//build/lite/run_shell_cmd.py", [ cmd ], "value")
​if (HAVE_OMX_IL_PATH) {deps += [ "${OMX_IL_PATH}:lib_omx" ]}

需创建 lib_omx 工程，并封装实现 libOMX_Core.z.so，供 codec hdi 接口调用。

如果 codec 驱动已实现 OpenMax 标准接口，则可直接封装 libOMX_Core 库，否则需要根据私有驱动实现 OpenMax 接口。

参考 RK3568 的适配过程，因 codec 驱动使用 rockchip 的 mpp 平台实现，需根据私有驱动实现 OpenMax 的接口。

参考 gn 文件：//device/soc/rockchip/rk3568/hardware/omx_il/BUILD.gn

group("lib_omx") {if (product_name == "rk3568") {deps = ["//device/soc/rockchip/rk3568/hardware/omx_il/component/video/dec:libomxvpu_dec","//device/soc/rockchip/rk3568/hardware/omx_il/component/video/enc:libomxvpu_enc","//device/soc/rockchip/rk3568/hardware/omx_il/core:libOMX_Core","//device/soc/rockchip/rk3568/hardware/omx_il/libOMXPlugin:libOMX_Pluginhw",]}
}

hcs 配置

  • 配置 codec_host 服务
    //vendor/hihope/rk3568/hdf_config/uhdf/device_info.hcs

    codec :: host {hostName = "codec_host";priority = 50;gid = ["codec_host", "uhdf_driver", "vendor_mpp_driver"];codec_omx_device :: device {device0 :: deviceNode {policy = 2;priority = 100;moduleName = "libcodec_hdi_omx_server.z.so";serviceName = "codec_hdi_omx_service";deviceMatchAttr = "codec_component_capabilities";}}
}

  • 配置 codec hcs
    需根据硬件信息配置编解码组件的配置参数
    //vendor/hihope/rk3568/hdf_config/uhdf/hdf.hcs

    #include "media_codec/codec_component_capabilities.hcs"

    //vendor/hihope/rk3568/hdf_config/uhdf/media_codec/codec_component_capabilities.hcs

    root {module = "master";codec_config {match_attr = "codec_component_capabilities";use_openmax = true;// capsMask: 0x01, Adaptive playback; 0x02, Secure playback; 0x04, Tunnel playback.// allocateMask: 0x01, Input buffer allocated within the Codec module;// allocateMask: 0x02, Input buffer allocated by an external user;// allocateMask: 0x04, Output buffer allocated within the Codec module;// allocateMask: 0x08, Output buffer allocated by an external user.VideoHwEncoders {/* node name explanation -- HDF_video_hw_enc_avc_rk：****    HDF____________video__________________hw____________________enc____________avc_______rk**     |               |                    |                      |              |        |** HDF or OMX    video or audio    hardware or software    encoder or decoder    mime    vendor*/HDF_video_hw_enc_avc_rk {role = 1;type = 1;name = "OMX.rk.video_encoder.avc";supportProfiles = [1, 32768, 2, 32768, 8, 32768];maxInst = 4;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 40000000;minWidth = 176;minHeight = 144;maxWidth = 1920;maxHeight = 1088;widthAlignment = 16;heightAlignment = 8;minBlockCount = 0xFFFFFFFF;maxBlockCount = 0xFFFFFFFF;minBlocksPerSecond = 0xFFFFFFFF;maxBlocksPerSecond = 0xFFFFFFFF;blockSizeWidth = 0xFFFFFFFF;blockSizeHeight = 0xFFFFFFFF;supportPixelFmts = [28, 24, 20, 12];measuredFrameRate = [320, 240, 165, 165, 720, 480, 149, 149, 1280, 720, 73, 73, 1920, 1080, 18, 18];bitRateMode = [1, 2];minFrameRate = 0;maxFrameRate = 0;}}VideoHwDecoders {HDF_video_hw_dec_avc_rk {role = 1;type = 0;name = "OMX.rk.video_decoder.avc";supportProfiles = [1, 32768, 2, 32768, 8, 32768];maxInst = 6;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 10000000;minWidth = 176;minHeight = 144;maxWidth = 4096;maxHeight = 2160;widthAlignment = 8;heightAlignment = 8;minBlockCount = 0xFFFFFFFF;maxBlockCount = 0xFFFFFFFF;minBlocksPerSecond = 1;maxBlocksPerSecond = 244800;blockSizeWidth = 16;blockSizeHeight = 16;supportPixelFmts = [24];measuredFrameRate = [320, 240, 617, 617, 720, 480, 559, 559, 1280, 720, 276, 276, 1920, 1080, 164, 164, 3840, 2160, 30, 30];bitRateMode = [];minFrameRate = 0;maxFrameRate = 0;}HDF_video_hw_dec_mpeg2_rk {role = 0xFFFFFFFF;type = 0;name = "OMX.rk.video_decoder.m2v";supportProfiles = [0, 3, 1, 3];maxInst = 6;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 10000000;minWidth = 176;minHeight = 144;maxWidth = 1920;maxHeight = 1088;widthAlignment = 8;heightAlignment = 8;minBlockCount = 0xFFFFFFFF;maxBlockCount = 0xFFFFFFFF;minBlocksPerSecond = 1;maxBlocksPerSecond = 244800;blockSizeWidth = 16;blockSizeHeight = 8;supportPixelFmts = [24];measuredFrameRate = [];bitRateMode = [];minFrameRate = 0;maxFrameRate = 0;}HDF_video_hw_dec_v8p_rk {role = 0xFFFFFFFF;type = 0;name = "OMX.rk.video_decoder.vp8";supportProfiles = [];maxInst = 6;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 10000000;minWidth = 176;minHeight = 144;maxWidth = 1920;maxHeight = 1088;widthAlignment = 8;heightAlignment = 8;minBlockCount = 0xFFFFFFFF;maxBlockCount = 0xFFFFFFFF;minBlocksPerSecond = 1;maxBlocksPerSecond = 244800;blockSizeWidth = 16;blockSizeHeight = 16;supportPixelFmts = [24];measuredFrameRate = [320, 180, 500, 500, 640, 360, 387, 387, 1280, 720, 112, 112, 1920, 1080, 77, 77];bitRateMode = [];minFrameRate = 0;maxFrameRate = 0;}HDF_video_hw_dec_h263_rk {role = 0xFFFFFFFF;type = 0;name = "OMX.rk.video_decoder.h263";supportProfiles = [1, 1, 1, 2, 1, 4, 1, 16, 8, 1, 8, 2, 8, 4, 8, 16];maxInst = 6;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 10000000;minWidth = 176;minHeight = 144;maxWidth = 1920;maxHeight = 1088;widthAlignment = 8;heightAlignment = 8;minBlockCount = 0xFFFFFFFF;maxBlockCount = 0xFFFFFFFF;minBlocksPerSecond = 1;maxBlocksPerSecond = 244800;blockSizeWidth = 16;blockSizeHeight = 16;supportPixelFmts = [24];measuredFrameRate = [176, 144, 600, 600, 352, 288, 600, 600];bitRateMode = [];minFrameRate = 0;maxFrameRate = 0;}HDF_video_hw_dec_m4v_rk {role = 3;type = 0;name = "OMX.rk.video_decoder.m4v";supportProfiles = [1, 1, 1, 2, 1, 4, 1, 8, 1, 16];maxInst = 6;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 10000000;minWidth = 176;minHeight = 144;maxWidth = 1920;maxHeight = 1088;widthAlignment = 8;heightAlignment = 8;minBlockCount = 0xFFFFFFFF;maxBlockCount = 0xFFFFFFFF;minBlocksPerSecond = 1;maxBlocksPerSecond = 244800;blockSizeWidth = 16;blockSizeHeight = 16;supportPixelFmts = [24];measuredFrameRate = [176, 144, 600, 600];bitRateMode = [];minFrameRate = 0;maxFrameRate = 0;}HDF_video_hw_dec_flv_rk {role = 0xFFFFFFFF;type = 0;name = "OMX.rk.video_decoder.flv1";supportProfiles = [];maxInst = 6;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 10000000;minWidth = 176;minHeight = 144;maxWidth = 1920;maxHeight = 1088;widthAlignment = 8;heightAlignment = 8;minBlockCount = 0xFFFFFFFF;maxBlockCount = 0xFFFFFFFF;minBlocksPerSecond = 1;maxBlocksPerSecond = 244800;blockSizeWidth = 16;blockSizeHeight = 16;supportPixelFmts = [24];measuredFrameRate = [];bitRateMode = [];minFrameRate = 0;maxFrameRate = 0;}HDF_video_hw_dec_mjpeg_rk {role = 0;type = 0;name = "OMX.rk.video_decoder.mjpeg";supportProfiles = [];maxInst = 6;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 10000000;minWidth = 176;minHeight = 144;maxWidth = 1920;maxHeight = 1088;widthAlignment = 8;heightAlignment = 8;minBlockCount = 0xFFFFFFFF;maxBlockCount = 0xFFFFFFFF;minBlocksPerSecond = 1;maxBlocksPerSecond = 244800;blockSizeWidth = 16;blockSizeHeight = 16;supportPixelFmts = [24];measuredFrameRate = [];bitRateMode = [];minFrameRate = 0;maxFrameRate = 0;}HDF_video_hw_dec_hevc_rk {role = 2;type = 0;name = "OMX.rk.video_decoder.hevc";supportProfiles = [1, 1, 1, 4, 1, 16, 1, 64, 1, 256, 1, 1024, 1, 4096, 1, 16384, 1, 65536, 2, 65536];maxInst = 6;isSoftwareCodec = false;processModeMask = [];capsMask = [0x01];minBitRate = 1;maxBitRate = 160000000;minWidth = 176;minHeight = 144;maxWidth = 1920;maxHeight = 1088;widthAlignment = 2;heightAlignment = 2;minBlockCount = 0xFFFFFFFF;maxBlockCount = 0xFFFFFFFF;minBlocksPerSecond = 1;maxBlocksPerSecond = 244800;blockSizeWidth = 16;blockSizeHeight = 16;supportPixelFmts = [24];measuredFrameRate = [352, 288, 700, 700, 720, 480, 700, 700, 640, 360, 980, 980, 1280, 720, 600, 600, 1920, 1080, 130, 130, 3840, 2160, 130, 130];bitRateMode = [];minFrameRate = 0;maxFrameRate = 0;}}VideoSwEncoders {}VideoSwDecoders {}AudioHwEncoders {}AudioHwDecoders {}AudioSwEncoders {}AudioSwDecoders {}}
}

适配验证

  • 当系统启动后，拉起 codec_host 进程，日志中有加载 hcs 配置的 component 相关组件的 log，则初步判定适配过程正常。

  • 当前系统通过 gstreamer 插件实现视频编解码功能。当未实现硬件编解码时，默认使用 FFmpeg 软件编解码。
    codec hdi 插件加载过程如下：
    ///foundation/multimedia/player_framework/services/engine/gstreamer/plugins/codec/hdi_plugins/hdi_init.cpp

    void HdiInit::AddHdiCap(CodecCompCapability &hdiCap)
{MEDIA_LOGI("Add codec name %{public}s", hdiCap.compName);CapabilityData codecCap;codecCap.codecName = hdiCap.compName;codecCap.codecType = GetCodecType(hdiCap.type);codecCap.mimeType = GetCodecMime(hdiCap.role);codecCap.isVendor = !hdiCap.isSoftwareCodec;codecCap.alignment = {hdiCap.port.video.whAlignment.widthAlignment, hdiCap.port.video.whAlignment.heightAlignment};codecCap.bitrateMode = GetBitrateMode(hdiCap.port.video);codecCap.width = {hdiCap.port.video.minSize.width, hdiCap.port.video.maxSize.width};codecCap.height = {hdiCap.port.video.minSize.height, hdiCap.port.video.maxSize.height};codecCap.bitrate = {hdiCap.bitRate.min, hdiCap.bitRate.max};codecCap.frameRate = {hdiCap.port.video.frameRate.min, hdiCap.port.video.frameRate.max};codecCap.format = GetCodecFormats(hdiCap.port.video);codecCap.blockPerFrame = {hdiCap.port.video.blockCount.min, hdiCap.port.video.blockCount.max};codecCap.blockPerSecond = {hdiCap.port.video.blocksPerSecond.min, hdiCap.port.video.blocksPerSecond.max};codecCap.blockSize = {hdiCap.port.video.blockSize.width, hdiCap.port.video.blockSize.height};codecCap.measuredFrameRate = GetMeasuredFrameRate(hdiCap.port.video);codecCap.profileLevelsMap = GetCodecProfileLevels(hdiCap);capabilitys_.push_back(codecCap);
}

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《MyBatis-plus处理存储json数据过程》文章介绍MyBatis-Plus3.4.21处理对象与集合的差异：对象可用内置Handler配合autoResultMap,集合需自定义处理器继承F... 目录1、如果是对象2、如果需要转换的是List集合总结对象和集合分两种情况处理，目前我用的MP的版本
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Ubuntu如何升级Python版本

Ubuntu如何升级Python版本

《Ubuntu如何升级Python版本》Ubuntu22.04Docker中,安装Python3.11后,使用update-alternatives设置为默认版本,最后用python3-V验证... 目China编程录问题描述前提环境解决方法总结问题描述Ubuntu22.04系统自带python3.10，想升级
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Java Kafka消费者实现过程

Java Kafka消费者实现过程

《JavaKafka消费者实现过程》Kafka消费者通过KafkaConsumer类实现,核心机制包括偏移量管理、消费者组协调、批量拉取消息及多线程处理,手动提交offset确保数据可靠性,自动提交... 目录基础KafkaConsumer类分析关键代码与核心算法2.1 订阅与分区分配2.2 拉取消息2.3
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AOP编程的基本概念与idea编辑器的配合体验过程

AOP编程的基本概念与idea编辑器的配合体验过程

《AOP编程的基本概念与idea编辑器的配合体验过程》文章简要介绍了AOP基础概念,包括Before/Around通知、PointCut切入点、Advice通知体、JoinPoint连接点等,说明它们... 目录BeforeAroundAdvise — 通知PointCut — 切入点Acpect — 切面
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C++ STL-string类底层实现过程

C++ STL-string类底层实现过程

《C++STL-string类底层实现过程》本文实现了一个简易的string类,涵盖动态数组存储、深拷贝机制、迭代器支持、容量调整、字符串修改、运算符重载等功能,模拟标准string核心特性,重点强... 目录实现框架一、默认成员函数1.默认构造函数2.构造函数3.拷贝构造函数(重点)4.赋值运算符重载函数
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MySQ中出现幻读问题的解决过程

MySQ中出现幻读问题的解决过程

《MySQ中出现幻读问题的解决过程》文章解析MySQLInnoDB通过MVCC与间隙锁机制在可重复读隔离级别下解决幻读,确保事务一致性,同时指出性能影响及乐观锁等替代方案,帮助开发者优化数据库应用... 目录一、幻读的准确定义与核心特征幻读 vs 不可重复读二、mysql隔离级别深度解析各隔离级别的实现差异
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Nginx添加内置模块过程

Nginx添加内置模块过程

《Nginx添加内置模块过程》文章指导如何检查并添加Nginx的with-http_gzip_static模块：确认该模块未默认安装后,需下载同版本源码重新编译,备份替换原有二进制文件,最后重启服务验... 目录1、查看Nginx已编辑的模块2、Nginx官网查看内置模块3、停止Nginx服务4、Nginx
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