# 回放示例-Playback

功能描述：連接設(shè)備開流 , 載入視頻文件進(jìn)行回放，并通過ESC_KEY鍵退出程序

> 本示例基于C++ High Level API進(jìn)行演示

首先需要?jiǎng)?chuàng)建一個(gè)用于回放文件的Pipeline

//創(chuàng)建用于回放的pipeline對(duì)象
ob::Pipeline pipe("./OrbbecPipeline.bag");

獲取回放對(duì)象的回放狀態(tài)回調(diào)

//獲取回放對(duì)象設(shè)置回放狀態(tài)回調(diào)
auto playback = pipe.getPlayback();
playback->setPlaybackStateCallback([&](OBMediaState state) {
    if(state == OB_MEDIA_BEGIN) {
        std::cout << "Playback file begin." << std::endl;
    }
    else if(state == OB_MEDIA_END) {
        std::cout << "Playback file end." << std::endl;
    }
});

從回放文件中讀取設(shè)備信息與內(nèi)參信息

//從回放文件中讀取設(shè)備信息
auto deviceInfo = playback->getDeviceInfo();
std::cout << "======================DeviceInfo: name : " << deviceInfo->name() << " sn: " << deviceInfo->serialNumber()
  << " firmware: " << deviceInfo->firmwareVersion() << " vid: " << deviceInfo->vid() << " pid: " << deviceInfo->pid() << std::endl;

//從回放文件中讀取內(nèi)參信息
auto cameraParam = pipe.getCameraParam();
std::cout << "======================Camera params : rgb width:" << cameraParam.rgbIntrinsic.width << " rgb height: " << cameraParam.rgbIntrinsic.height
              << " depth width: " << cameraParam.depthIntrinsic.width << " depth height: " << cameraParam.rgbIntrinsic.height << std::endl;

開啟回放

//開啟回放
pipe.start(NULL);

以阻塞的方式等待一幀數(shù)據(jù)，該幀是一個(gè)復(fù)合幀，里面包含配置里啟用的所有流的幀數(shù)據(jù)，并設(shè)置幀的等待超時(shí)時(shí)間

auto frameSet = pipe.waitForFrames(100);    //設(shè)置等待時(shí)間為100ms

停止Pipeline，將不再產(chǎn)生幀數(shù)據(jù)

pipe.stop();

程序正常退出后會(huì)釋放資源

預(yù)期輸出：