SDL 2.0指定qt窗口显示pjsua接收的视频流代码示例

SDL (Simple DirectMedia Layer) 是一个跨平台的多媒体库，用于处理音频、视频输入输出等，而 Qt 则是一个强大的 C++ 应用程序框架。要将 PJSUA 接收的视频流通过 SDL 显示到 Qt 窗口，你需要结合两者以及一些底层编程知识。以下是一个简化的代码示例，它假设你已经有了一个基本的 PJSUA 实例并且接收到视频数据：

#include <QApplication>
#include <QQuickView>
#include <QQmlEngine>
#include "pjmedia.h"
#include "sdl.h"

// 假设 pjmedia_video_data_t 是从 PJSUA 获取到的视频数据结构
class VideoRenderer : public QRunnable {
public:
    void run() {
        // 获取PJSUA提供的视频数据
        pjmedia_video_data_t video_data = ...;

        // 初始化SDL
        if (! SDL_Init(SDL_INIT_VIDEO)) {
            qDebug() << "SDL initialization failed: " << SDL_GetError();
            return;
        }

        // 创建渲染窗口
        SDL_Window* sdl_window = SDL_CreateWindow(
            "Video Display", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
            video_data.width, video_data.height,
            SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE
        );
        if (!sdl_window) {
            qDebug() << "Failed to create SDL window: " << SDL_GetError();
            SDL_Quit();
            return;
        }

        // 获取窗口的渲染上下文
        SDL_Renderer* renderer = SDL_CreateRenderer(sdl_window, -1, 0);
        if (!renderer) {
            qDebug() << "Failed to create SDL renderer: " << SDL_GetError();
            SDL_DestroyWindow(sdl_window);
            SDL_Quit();
            return;
        }

        // 渲染视频帧到窗口
        while (true) {
            Uint8* pixels = static_cast<Uint8*>(video_data.buf);
            SDL_UpdateTexture(renderer, NULL, pixels, video_data.size);

            SDL_RenderClear(renderer);
            SDL_RenderCopy(renderer, video_data.texture, NULL, NULL);
            SDL_RenderPresent(renderer);

            // 更新循环直到有新的视频帧可用或者PJSUA关闭
            pj_status_t status = pjsua_vid_get_next_frame(video_data);
            if (status != PJ_SUCCESS) {
                break;
            }
        }

        // 清理资源并退出SDL
        SDL_DestroyRenderer(renderer);
        SDL_DestroyWindow(sdl_window);
        SDL_Quit();
    }
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    // 初始化PJSUA和视频处理
    PJSua pj_sua;
    VideoRenderer* video_task = new VideoRenderer();

    // 运行视频渲染任务
    QObject::connect(&pj_sua, &PJSua::onIncomingCall, video_task, &VideoRenderer::run);
    pj_sua.start();

    QQmlEngine engine;
    QQmlContext *context = engine.rootContext();
    context->setContextProperty("window", qobject_cast<QObject*>(app.mainWindow()));

    QQmlApplicationEngine engine_qt;
    engine_qt.load(QUrl(QStringLiteral("qrc:/main.qml")));

    if (!engine_qt.waitForInitialization(5000)) {
        qDebug() << "Failed to load QML file";
        return -1;
    }

    return app.exec();
}