近來公司有個直播類的專案，讓我調研下阿里雲直播，花了3、4天調研結束後，做下筆記，一方面自己日後便於檢視，另一方面與大家做個交流，有說的不正確的。歡迎指正。

需求說明：本專案有三個媒體端，分別是app、微信和pc。下面分別講述下三個媒體端的場景。
- app端是給講師直播用的
- 微信端是給學員看直播用的
- pc端是給管理員用的

下面介紹下阿里雲的直播使用：
1.在app端需要推流到阿里雲cdn,需要應用伺服器生成一個推流地址(有推流地址就能拼出拉流地址),且配置回撥監聽推流狀態.(如圖-1所示)
2.在微信端需要拉流地址(直播地址),需要從應用伺服器拿到拉流地址
3.配置直播錄播轉點播後，直播推流中斷三分鐘後，直播的視訊會被傳輸到點播，此時配置一個回撥地址(針對兩種情況進行回撥,如圖-2所示)
a.直播視訊已經被傳輸到點播(注意:此時已經得到videoid，但是視訊還在轉碼，還是無法播放)
b.傳輸到點播的視訊已經轉碼成功(此時可以播放視訊了)

package com.yx.tsing.course.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import com.yx.tsing.common.ConsHint;
import com.yx.tsing.common.Constant;
import com.yx.tsing.common.result.JsonPageResult;
import com.yx.tsing.common.result.JsonResult;
import
 
 com.yx.tsing.course.domain.Course;
import com.yx.tsing.course.service.CourseService;
import com.yx.tsing.course.vo.*;
import com.yx.tsing.utils.AliUtil;
import com.yx.tsing.utils.MD5Util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import
 
 org.springframework.util.Assert;
import org.springframework.web.bind.annotation.*;
import tk.mybatis.mapper.entity.Example;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.text.MessageFormat;
import java.util.Date;

/**
 * create by zml on 2018/3/6 16:52
 */
@RestController
@RequestMapping("/course")
public class CourseController {

    @Autowired
    private CourseService courseService;

    @Value("#{configProperties['live.appName']}")
    private String appName;

    @Value("#{configProperties['live.streamName']}")
    private String streamName;

    @Value("#{configProperties['live.vhost']}")
    private String vhost;

    @Value("#{configProperties['live.key']}")
    private String key;

    /**
     * 根據課程id拿到推流地址
     * @param id
     * @throws Exception
     */
    @RequestMapping(value = "/pushUrl")
    public JsonResult pushUrl(long id) {
        //傳入自定義引數，即傳入應用名稱和流名稱
//        String AppName = "tsonline";
        String StreamName = streamName +"_"+id;
//        String vhost = "live.ayxsoft.top";
        //時間戳，有效時間
        long time = System.currentTimeMillis() + 1800;
        //加密key，即直播後臺鑑權裡面自行設定
//        String key = "qreVeWGNRC";
        String strpush = "/" + appName + "/" + StreamName + "-" + time + "-0-0-" + key;
        // 裡面的直播推流中心伺服器域名、vhost域名可根據自身實際情況進行設定
        String pushurl = "rtmp://video-center.alivecdn.com/" + appName + "/" + StreamName + "?vhost=" + vhost + "&auth_key=" + time + "-0-0-" + MD5Util.getMD5(strpush);
//        $strviewrtmp = "/$AppName/$StreamName-$time-0-0-$key";
//        $strviewflv = "/$AppName/$StreamName.flv-$time-0-0-$key";
        String strviewm3u8 = "/" + appName + "/" + StreamName + ".m3u8-" + time + "-0-0-" + key;

        String rtmpurl = "rtmp://" + vhost + "/" + appName + "/" + StreamName + "?auth_key=" + time + "-0-0-" + MD5Util.getMD5(strpush);
//        $flvurl = "http://live1.playzhan.com/$AppName/$StreamName.flv?auth_key=$time-0-0-".md5($strviewflv);
        String m3u8url = "http://" + vhost + "/" + appName + "/" + StreamName + ".m3u8?auth_key=" + time + "-0-0-" + MD5Util.getMD5(strviewm3u8);
        //列印推流地址，即通過鑑權簽名後的推流地址
        System.out.println("推流地址== " + pushurl);
        //列印三種直播協議播放地址，即鑑權後的播放地址
        System.out.println("播放地址rtmp PushUrlVo==" + rtmpurl);
//        echo $flvurl.'<br>';
        System.out.println("播放地址m3u8url==" + m3u8url);

        //儲存播放地址到資料庫
        courseService.playUrl(id,rtmpurl+";"+m3u8url);

        return new JsonResult(true,"success!",new PushUrlVo(pushurl));
    }

    /**
     * 阿里雲直播平臺通知使用者當前域名推流狀態,例如推流成功或者斷流
     * 中心推流回調(判斷課程是否在直播)
     * @throws Exception
     */
    @RequestMapping(value = "/pushCallBack")
    public void pushCallBack(@RequestParam(value = "action",defaultValue = "",required = false) String action,
                             @RequestParam(value = "app",defaultValue = "",required = false) String app,
                             @RequestParam(value = "appname",defaultValue = "",required = false) String appname,
                             @RequestParam(value = "id",defaultValue = "",required = false) String id,
                             @RequestParam(value = "ip",defaultValue = "",required = false) String ip,
                             @RequestParam(value = "node",defaultValue = "",required = false) String node) {
        System.out.println("action=="+action);//publish和publish_done
        System.out.println("app=="+app);//
        System.out.println("appname=="+appname);//
        System.out.println("id=="+id);//
        System.out.println("ip=="+ip);//171.13.130.227
        System.out.println("node=="+node);//et2

        long courseId = Long.valueOf(id.split("_")[1]);
        int type = 1;
        if("publish".equals(action)){
            type = 2;
        }else if("publish_done".equals(action)){
            type = 3;
        }
        courseService.setType(courseId ,type);
    }

    /**
     * 1.開啟直播錄製到點播後，當完成一個錄製週期或直播流結束時會生成一個點播視訊,此時阿里雲點播平臺會回撥此介面
     * 2.視訊在點播平臺轉碼成功會回撥此介面
     * 點播回撥
     * @param request
     * @param response
     * @throws Exception
     */
    @RequestMapping(value = "/playCallBack")
    public void callBack(HttpServletRequest request, HttpServletResponse response) throws Exception {
        String c_length=request.getHeader("content-length");
        int c_i=Integer.parseInt(c_length);
        //解析阿里回撥伺服器的介面資料
        String result = AliUtil.GetPostBody(request.getInputStream(), c_i);
        System.out.println("resultCallBack=="+result);

        JSONObject jsonObject = JSON.parseObject(result);
        String EventType = jsonObject.getString("EventType");
        String Status = jsonObject.getString("Status");
        if("AddLiveRecordVideoComplete".equals(EventType)){ //第一種情況,直播錄製轉點播成功
            if("success".equals(Status)){
                //儲存返回來的檔案資訊
                //{"Status":"success","VideoId":"e5524b741330406c99e08698433dd387","StreamName":"StreamName_1","RecordStartTime":"2018-03-06T07:51:38Z","EventType":"AddLiveRecordVideoComplete","DomainName":"live.ayxsoft.top","RecordEndTime":"2018-03-06T07:53:47Z","UserId":1023641609718688,"EventTime":"2018-03-06T07:56:47Z","AppName":"tsonline"}
                String videoId = jsonObject.getString("VideoId");
                String StreamName = jsonObject.getString("StreamName");
                long courseId = Long.valueOf(StreamName.split("_")[1]);

                Course course = new Course();
                course.setId(courseId);
                course.setType(3);
                course.setRecordPath(videoId);
                course.setUpdateTime(new Date());
                courseService.updateByPrimaryKeySelective(course);
                //返回給點播伺服器
                AliUtil.response(request, response, "{\"Status\":\"OK\"}", HttpServletResponse.SC_OK);
            } else {
                AliUtil.response(request, response, "{\"Status\":\"verdify not ok\"}", HttpServletResponse.SC_BAD_REQUEST);
            }

        }else if("TranscodeComplete".equals(EventType)){//第二種情況,視訊在點播平臺轉碼成功
            if("success".equals(Status)){
                //儲存返回來的檔案資訊d
                //{"VideoId": "43q9fjasjdflask","Status": "success","StreamInfos":[],"EventTime": "2017-03-20T07:49:17Z","EventType": "TranscodeComplete"}
                String videoId = jsonObject.getString("VideoId");
                String status = jsonObject.getString("Status");

                if("success".equals(status)){
                    Example example = new Example(Course.class);
                    Example.Criteria criteria = example.createCriteria();
                    criteria.andEqualTo("recordPath",videoId);
                    criteria.andEqualTo("type",3);//只考慮 直播錄播到點播轉碼成功 的情況

                    Course course = new Course();
                    course.setType(4);
                    course.setUpdateTime(new Date());
                    courseService.updateByExampleSelective(course,example);
                }

                //返回給點播伺服器
                AliUtil.response(request, response, "{\"Status\":\"OK\"}", HttpServletResponse.SC_OK);
            } else {
                AliUtil.response(request, response, "{\"Status\":\"verdify not ok\"}", HttpServletResponse.SC_BAD_REQUEST);
            }
        }


    }

}

下面介紹下阿里雲的點播使用：
1.上傳,上傳時需要請求應用伺服器拿到上傳許可權和上傳地址
2.播放.播放有兩種方式，一種是用阿里雲播放器，另一種是使用自有、開源播放器

第一種，需要播放憑證(很安全，確保視訊不會被盜用)或者播放地址(可以開啟鑑權使生成的地址有時效性，相對安全)；
第二種只需要播放地址即可