1.C/C++开发人员要了解的框框架几大著名C/C++开源库
2.使用CEF(四)— 在QT中集成CEF(1)基本集成
3.chromium+embedded+framework能卸载吗?
4.å¦ä½å©ç¨CEF3å建ä¸ä¸ªç®åçåºç¨ç¨åº
C/C++开发人员要了解的几大著名C/C++开源库
在开源软件领域,众多知名的架源国产软件如暴风音影、腾讯会议、码下PC版微信等,有什用背后都依托于一些大型的框框架C/C++开源库。本文将深入介绍几种日常工作中常用的架源一式三线布林指标源码C/C++开源库,为开发者提供借鉴与参考。码下
**多媒体处理开源库FFmpeg
**FFmpeg,有什用享有盛名的框框架音视频多媒体处理开源库,几乎每个做过音视频编解码开发的架源开发者都熟悉。它包含了广泛而全面的码下音视频编码协议,如H、有什用H、框框架MPEG4、架源H等,码下并提供了一整套音视频处理解决方案。ec源码怎么用从音视频采集与编码、解码、格式转换到视频抓图和加水印,FFmpeg都能轻松应对。其强大的sdk接口允许开发者直接接收和发送码流,读写文件,进行编解码操作,以及修改解码数据格式等。
FFmpeg基于C语言实现,执行效率接近汇编语言,特别适合对实时性有高要求的音视频处理场景。项目中常包含优化效率的汇编代码,直接控制操作以达到最优性能,不依赖通用编译器生成的汇编代码。
几乎所有的angularjs2 源码视频播放器都依赖FFmpeg的音视频解码功能,包括暴风影音、QQ影音、腾讯视频、爱奇艺视频、优酷视频等。播放器通过将压缩的视频图像帧解码为并连续显示来实现动态播放效果。帧率达到帧时,人眼就能感知连续动态的播放。
FFmpeg支持多种音视频格式的相互转换,广泛应用于格式工厂、暴风转码、QQ音影视频格式转换工具、狸窝视频转换器、迅捷视频转换器等软件。
**实时音视频处理开源库WebRTC
**WebRTC,gpu 挖矿 程序源码由Google发起的实时音视频通讯开源库,提供了从音视频采集、编码、网络传输到解码渲染的整套解决方案。WebRTC使得开发者能够轻松构建实时音视频应用,无需下载插件,只需编写简单的JavaScript程序即可实现。
WebRTC基于C/C++实现,具有跨平台性能,支持Windows、MAC、iOS和Android等多系统,通过调用相应系统的SDK即可构建音视频应用。虽然称为WebRTC,它不仅支持Web间通讯,linux lrzsz 源码安装还支持Windows、Android和iOS平台。
WebRTC因其出色的音视频效果和网络适应性,广泛应用于视频会议、实时音视频直播等领域。腾讯会议、华为WeLink、字节飞书、阿里钉钉、科达、ZOOM、小鱼易连等均采用了WebRTC方案提供视频会议服务。声网(Agora)基于开源WebRTC库,提供了多个行业的音视频互动解决方案,服务覆盖了包括小米、陌陌、斗鱼、哔哩哔哩、新东方、小红书、HTC VIVE、The Meet Group、Bunch、Yalla等企业和机构。
**Chromium浏览器内核开源库Chromium
**Chromium是Google的久负盛名的浏览器开源项目,作为Chrome浏览器的引擎,其设计理念强调简单、高速、稳定与安全。Chromium采用了WebKit渲染引擎和V8 JavaScript引擎,支持沙盒、黑名单、无痕浏览等功能,提供了稳定与安全的网页浏览环境。
Chromium与Chrome浏览器的关系:Chromium是Google的开源项目,而Chrome是基于Chromium维护的浏览器,添加了更多功能并进行了优化。Chromium面向的是极客、开发人员和体验新功能的用户。
Chromium的根目录下包含了多个文件夹,如Android WebView实现、Chromium浏览器代码、base模块、breakpad崩溃报告、build构建配置、cc合成器实现等。Chromium使用多进程架构,支持多种协议的网络通信,提供丰富的API接口,适合开发者深入研究。
**Chromium嵌入式框架开源库CEF
**CEF,Chromium Embedded Framework,是一个基于Chromium的开源浏览器控件,使用C++实现。它作为浏览器控件嵌入到应用程序中,允许在应用窗口中打开网页。CEF提供了稳定且丰富的API接口,支持Windows、Linux、Mac等多个平台,能与Webkit渲染引擎和HTML5特性兼容。
CEF典型应用场景包括:嵌入浏览器控件到本地应用、创建轻量级浏览器壳、离线渲染Web内容、自动化Web测试等。许多C/S架构的PC桌面程序,如QQ、PC版微信、企业微信、钉钉、飞书、迅雷、爱奇艺视频客户端、优酷视频客户端、有道词典、有道云笔记、MindMaster等,都内嵌了CEF浏览器控件。
**多协议网络传输开源库libcurl
**libcurl是一个跨平台的网络传输库,支持多种协议如ftp、ftps、ï¼å½ç¶ï¼ä½ ä¹å¯ä»¥ç¨èªå®ä¹ç URL å»æ¿ä»£å®ï¼ææ¹ä¾¿çå°±æ¯éè¿å½ä»¤è¡æå®ã
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#include <windows.h>
#include "cefsimple/simple_app.h"
#include "include/cef_sandbox_win.h"
// Set to 0 to disable sandbox support.
#define CEF_ENABLE_SANDBOX 1
#if CEF_ENABLE_SANDBOX
// The cef_sandbox.lib static library is currently built with VS. It may not
// link successfully with other VS versions.
#pragma comment(lib, "cef_sandbox.lib")
#endif
// Entry point function for all processes.
int APIENTRY wWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow) {
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
void* sandbox_info = NULL;
#if CEF_ENABLE_SANDBOX
// Manage the life span of the sandbox information object. This is necessary
// for sandbox support on Windows. See cef_sandbox_win.h for complete details.
CefScopedSandboxInfo scoped_sandbox;
sandbox_info = scoped_sandbox.sandbox_info();
#endif
// Provide CEF with command-line arguments.
CefMainArgs main_args(hInstance);
// SimpleApp implements application-level callbacks. It will create the first
// browser instance in OnContextInitialized() after CEF has initialized.
CefRefPtr<SimpleApp> app(new SimpleApp);
// CEF applications have multiple sub-processes (render, plugin, GPU, etc)
// that share the same executable. This function checks the command-line and,
// if this is a sub-process, executes the appropriate logic.
int exit_code = CefExecuteProcess(main_args, app.get(), sandbox_info);
if (exit_code >= 0) {
// The sub-process has completed so return here.
return exit_code;
}
// Specify CEF global settings here.
CefSettings settings;
#if !CEF_ENABLE_SANDBOX
settings.no_sandbox = true;
#endif
// Initialize CEF.
CefInitialize(main_args, settings, app.get(), sandbox_info);
// Run the CEF message loop. This will block until CefQuitMessageLoop() is
// called.
CefRunMessageLoop();
// Shut down CEF.
CefShutdown();
return 0;
}
SimpleApp
SimpleApp è´è´£å¤çè¿ç¨çº§å«çåè°æ¹æ³ãå®ä¼æé²åºä¸äºå¨å¤è¿ç¨ä¸å ±äº«æè 被ç¹å®è¿ç¨ä½¿ç¨çæ¥å£åæ¹æ³ãCefBrowserProcessHandler æ¥å£ï¼å¨æµè§å¨è¿ç¨ä¸è°ç¨ãè¿æä¸ä¸ªè¢«åç¦»åº CefBrowserProcessHandler æ¥å£ï¼ä¾å项ç®æ²¡æå±ç¤ºï¼åªä¼å¨æ¸²æè¿ç¨ä¸è¢«è°ç¨ãç±äº CefBrowserProcessHandler ä¸å å®ç°äº CefApp, åæ¶è¿æ CefBrowserProcessHandlerï¼æ以å®çè¿åå¼å¿ é¡»æ¯[this]ã
// simple_app.h
#include "include/cef_app.h"
class SimpleApp : public CefApp,
public CefBrowserProcessHandler {
public:
SimpleApp();
// CefApp methods:
virtual CefRefPtr<CefBrowserProcessHandler> GetBrowserProcessHandler()
OVERRIDE { return this; }
// CefBrowserProcessHandler methods:
virtual void OnContextInitialized() OVERRIDE;
private:
// Include the default reference counting implementation.
IMPLEMENT_REFCOUNTING(SimpleApp);
};
// simple_app.cpp
#include "cefsimple/simple_app.h"
#include <string>
#include "cefsimple/simple_handler.h"
#include "cefsimple/util.h"
#include "include/cef_browser.h"
#include "include/cef_command_line.h"
SimpleApp::SimpleApp() {
}
void SimpleApp::OnContextInitialized() {
REQUIRE_UI_THREAD();
// Information used when creating the native window.
CefWindowInfo window_info;
#if defined(OS_WIN)
// On Windows we need to specify certain flags that will be passed to
// CreateWindowEx().
window_info.SetAsPopup(NULL, "cefsimple");
#endif
// SimpleHandler implements browser-level callbacks.
CefRefPtr<SimpleHandler> handler(new SimpleHandler());
// Specify CEF browser settings here.
CefBrowserSettings browser_settings;
std::string url;
// Check if a "--url=" value was provided via the command-line. If so, use
// that instead of the default URL.
CefRefPtr<CefCommandLine> command_line =
CefCommandLine::GetGlobalCommandLine();
url = command_line->GetSwitchValue("url");
if (url.empty())
url = "xxx";
// Create the first browser window.
CefBrowserHost::CreateBrowserSync(window_info, handler.get(), url,
browser_settings, NULL);
}
SimpleHandler
SimpleHandler è´è´£å¤çæµè§å¨çº§å«çåè°æ¹æ³ãè¿äºåè°æ¹æ³ä¼å¨æµè§å¨è¿ç¨ä¸æ§è¡ãå¨è¿ä¸ªé¡¹ç®ä¸ï¼é对ææçæµè§å¨ä½¿ç¨ç¸åç CefClient å®ä¾ï¼ä½æ¯å¦æä½ æ¿æï¼å¯ä»¥å¨èªå·±çåºç¨ç¨åºä¸ä½¿ç¨ä¸åç CefClientå®ä¾çã
// simple_handler.h
#include "include/cef_client.h"
#include <list>
class SimpleHandler : public CefClient,
public CefDisplayHandler,
public CefLifeSpanHandler,
public CefLoadHandler {
public:
SimpleHandler();
~SimpleHandler();
// Provide access to the single global instance of this object.
static SimpleHandler* GetInstance();
// CefClient methods:
virtual CefRefPtr<CefDisplayHandler> GetDisplayHandler() OVERRIDE {
return this;
}
virtual CefRefPtr<CefLifeSpanHandler> GetLifeSpanHandler() OVERRIDE {
return this;
}
virtual CefRefPtr<CefLoadHandler> GetLoadHandler() OVERRIDE {
return this;
}
// CefDisplayHandler methods:
virtual void OnTitleChange(CefRefPtr<CefBrowser> browser,
const CefString& title) OVERRIDE;
// CefLifeSpanHandler methods:
virtual void OnAfterCreated(CefRefPtr<CefBrowser> browser) OVERRIDE;
virtual void OnBeforeClose(CefRefPtr<CefBrowser> browser) OVERRIDE;
// CefLoadHandler methods:
virtual void OnLoadError(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
ErrorCode errorCode,
const CefString& errorText,
const CefString& failedUrl) OVERRIDE;
// Request that all existing browser windows close.
void CloseAllBrowsers(bool force_close);
private:
// List of existing browser windows. Only accessed on the CEF UI thread.
typedef std::list<CefRefPtr<CefBrowser> > BrowserList;
BrowserList browser_list_;
// Include the default reference counting implementation.
IMPLEMENT_REFCOUNTING(SimpleHandler);
};
// simple_handler.cpp
#include "cefsimple/simple_handler.h"
#include <sstream>
#include <string>
#include "cefsimple/util.h"
#include "include/cef_app.h"
#include "include/cef_runnable.h"
namespace {
SimpleHandler* g_instance = NULL;
} // namespace
SimpleHandler::SimpleHandler() {
ASSERT(!g_instance);
g_instance = this;
}
SimpleHandler::~SimpleHandler() {
g_instance = NULL;
}
// static
SimpleHandler* SimpleHandler::GetInstance() {
return g_instance;
}
void SimpleHandler::OnAfterCreated(CefRefPtr<CefBrowser> browser) {
REQUIRE_UI_THREAD();
// Add to the list of existing browsers.
browser_list_.push_back(browser);
}
void SimpleHandler::OnBeforeClose(CefRefPtr<CefBrowser> browser) {
REQUIRE_UI_THREAD();
// Remove from the list of existing browsers.
BrowserList::iterator bit = browser_list_.begin();
for (; bit != browser_list_.end(); ++bit) {
if ((*bit)->IsSame(browser)) {
browser_list_.erase(bit);
break;
}
}
if (browser_list_.empty()) {
// All browser windows have closed. Quit the application message loop.
CefQuitMessageLoop();
}
}
void SimpleHandler::OnLoadError(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
ErrorCode errorCode,
const CefString& errorText,
const CefString& failedUrl) {
REQUIRE_UI_THREAD();
// Don't display an error for downloaded files.
if (errorCode == ERR_ABORTED)
return;
// Display a load error message.
std::stringstream ss;
ss << "<html><body bgcolor=\"white\">"
"<h2>Failed to load URL " << std::string(failedUrl) <<
" with error " << std::string(errorText) << " (" << errorCode <<
").</h2></body></html>";
frame->LoadString(ss.str(), failedUrl);
}