优化国标级联录像预览

src/main/java/com/genersoft/iot/vmp/gb28181/bean/SDPInfo.java

@@ -0,0 +1,14 @@
+package com.genersoft.iot.vmp.gb28181.bean;
+
+import javax.sdp.SessionDescription;
+
+public class SDPInfo {
+    private byte[] source;
+    private SessionDescription sdpSource;
+    private String sessionName;
+    private Long startTime;
+    private Long stopTime;
+    private String username;
+    private String address;
+    private String ssrc;
+}

src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java

@@ -453,6 +453,7 @@ public class SIPCommander implements ISIPCommander {
 			subscribeKey.put("app", "rtp");
 			subscribeKey.put("stream", ssrcInfo.getStream());
 			subscribeKey.put("regist", true);
+			subscribeKey.put("schema", "rtmp");
 			subscribeKey.put("mediaServerId", mediaServerItem.getId());
 			logger.debug("录像回放添加订阅，订阅内容：" + subscribeKey.toString());
 			subscribe.addSubscribe(ZLMHttpHookSubscribe.HookType.on_stream_changed, subscribeKey,
@@ -718,6 +719,7 @@ public class SIPCommander implements ISIPCommander {
 			if (ssrcTransaction != null) {
 				MediaServerItem mediaServerItem = mediaServerService.getOne(ssrcTransaction.getMediaServerId());
 				mediaServerService.releaseSsrc(mediaServerItem, ssrcTransaction.getSsrc());
+				mediaServerService.closeRTPServer(deviceId, channelId, ssrcTransaction.getStream());
 				streamSession.remove(deviceId, channelId, ssrcTransaction.getStream());
 			}
 		} catch (SipException | ParseException e) {

src/main/java/com/genersoft/iot/vmp/gb28181/transmit/event/request/impl/AckRequestProcessor.java

@@ -68,7 +68,7 @@ public class AckRequestProcessor extends SIPRequestProcessorParent implements In
 	 */
 	@Override
 	public void process(RequestEvent evt) {
-		logger.debug("ACK请求： {}", ((System.currentTimeMillis())));
+		logger.info("ACK请求： {}", ((System.currentTimeMillis())));
 		Dialog dialog = evt.getDialog();
 		if (dialog == null) return;
 		if (dialog.getState()== DialogState.CONFIRMED) {
@@ -88,10 +88,6 @@ public class AckRequestProcessor extends SIPRequestProcessorParent implements In
 				streamInfo = new StreamInfo();
 				streamInfo.setApp(sendRtpItem.getApp());
 				streamInfo.setStream(sendRtpItem.getStreamId());
-			}else {
-				streamInfo = redisCatchStorage.queryPlayByDevice(deviceId, channelId);
-				sendRtpItem.setStreamId(streamInfo.getStream());
-				streamInfo.setApp("rtp");
 			}
 			redisCatchStorage.updateSendRTPSever(sendRtpItem);
 			logger.info(platformGbId);

src/main/java/com/genersoft/iot/vmp/gb28181/transmit/event/request/impl/ByeRequestProcessor.java

@@ -2,6 +2,7 @@ package com.genersoft.iot.vmp.gb28181.transmit.event.request.impl;
 
 import com.genersoft.iot.vmp.common.StreamInfo;
 import com.genersoft.iot.vmp.gb28181.bean.Device;
+import com.genersoft.iot.vmp.gb28181.bean.ParentPlatform;
 import com.genersoft.iot.vmp.gb28181.bean.SendRtpItem;
 import com.genersoft.iot.vmp.gb28181.transmit.SIPProcessorObserver;
 import com.genersoft.iot.vmp.gb28181.transmit.cmd.ISIPCommander;
@@ -90,7 +91,7 @@ public class ByeRequestProcessor extends SIPRequestProcessorParent implements In
 					int totalReaderCount = zlmrtpServerFactory.totalReaderCount(mediaInfo, sendRtpItem.getApp(), streamId);
 					if (totalReaderCount == 0) {
 						logger.info(streamId + "无其它观看者，通知设备停止推流");
-						cmder.streamByeCmd(sendRtpItem.getDeviceId(), channelId);
+						cmder.streamByeCmd(sendRtpItem.getDeviceId(), channelId, streamId);
 					}else if (totalReaderCount == -1){
 						logger.warn(streamId + " 查找其它观看者失败");
 					}
@@ -98,22 +99,24 @@ public class ByeRequestProcessor extends SIPRequestProcessorParent implements In
 				// 可能是设备主动停止
 				Device device = storager.queryVideoDeviceByChannelId(platformGbId);
                 if (device != null) {
-					if (sendRtpItem.isPlay()) {
 					StreamInfo streamInfo = redisCatchStorage.queryPlayByDevice(device.getDeviceId(), channelId);
+					if (sendRtpItem != null) {
+						if (sendRtpItem.isPlay()) {
 							if (streamInfo != null) {
 								redisCatchStorage.stopPlay(streamInfo);
 							}
 						}else {
-						StreamInfo streamInfo = redisCatchStorage.queryPlaybackByDevice(device.getDeviceId(), channelId);
 							if (streamInfo != null) {
 								redisCatchStorage.stopPlayback(streamInfo);
 							}
 						}
 
 						storager.stopPlay(device.getDeviceId(), channelId);
-					mediaServerService.closeRTPServer(device, channelId, streamInfo.getStream());
+						mediaServerService.closeRTPServer(device.getDeviceId(), channelId, streamInfo.getStream());
 					}
 				}
+
+			}
 		} catch (SipException e) {
 			e.printStackTrace();
 		} catch (InvalidArgumentException e) {

src/main/java/com/genersoft/iot/vmp/gb28181/transmit/event/request/impl/InviteRequestProcessor.java

@@ -12,6 +12,7 @@ import com.genersoft.iot.vmp.gb28181.transmit.cmd.impl.SIPCommander;
 import com.genersoft.iot.vmp.gb28181.transmit.cmd.impl.SIPCommanderFroPlatform;
 import com.genersoft.iot.vmp.gb28181.transmit.event.request.ISIPRequestProcessor;
 import com.genersoft.iot.vmp.gb28181.transmit.event.request.SIPRequestProcessorParent;
+import com.genersoft.iot.vmp.gb28181.utils.SipUtils;
 import com.genersoft.iot.vmp.media.zlm.ZLMHttpHookSubscribe;
 import com.genersoft.iot.vmp.media.zlm.ZLMRTPServerFactory;
 import com.genersoft.iot.vmp.media.zlm.dto.MediaServerItem;
@@ -101,19 +102,12 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 	@Override
 	public void process(RequestEvent evt) {
 		//  Invite Request消息实现，此消息一般为级联消息，上级给下级发送请求视频指令
-		Long startTimeForInvite = System.currentTimeMillis();
 		try {
 			Request request = evt.getRequest();
 			SipURI sipURI = (SipURI) request.getRequestURI();
 			String channelId = sipURI.getUser();
-			String requesterId = null;
+			String requesterId = SipUtils.getUserIdFromFromHeader(request);
-
-			FromHeader fromHeader = (FromHeader)request.getHeader(FromHeader.NAME);
 			CallIdHeader callIdHeader = (CallIdHeader)request.getHeader(CallIdHeader.NAME);
-			AddressImpl address = (AddressImpl) fromHeader.getAddress();
-			SipUri uri = (SipUri) address.getURI();
-			requesterId = uri.getUser();
-
 			if (requesterId == null || channelId == null) {
 				logger.info("无法从FromHeader的Address中获取到平台id，返回400");
 				responseAck(evt, Response.BAD_REQUEST); // 参数不全， 发400，请求错误
@@ -122,7 +116,9 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 
 			// 查询请求是否来自上级平台\设备
 			ParentPlatform platform = storager.queryParentPlatByServerGBId(requesterId);
-			if (platform != null) {
+			if (platform == null) {
+				inviteFromDeviceHandle(evt, requesterId);
+			}else {
 				// 查询平台下是否有该通道
 				DeviceChannel channel = storager.queryChannelInParentPlatform(requesterId, channelId);
 				GbStream gbStream = storager.queryStreamInParentPlatform(requesterId, channelId);
@@ -141,7 +137,7 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 					mediaServerItem = mediaServerService.getOne(mediaServerId);
 					if (mediaServerItem == null) {
 						logger.info("[ app={}, stream={} ]找不到zlm {}，返回410",gbStream.getApp(), gbStream.getStream(), mediaServerId);
-						responseAck(evt, Response.GONE, "media server not found");
+						responseAck(evt, Response.GONE);
 						return;
 					}
 					Boolean streamReady = zlmrtpServerFactory.isStreamReady(mediaServerItem, gbStream.getApp(), gbStream.getStream());
@@ -197,7 +193,6 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 				// 查看是否支持PS 负载96
 				//String ip = null;
 				int port = -1;
-				//boolean recvonly = false;
 				boolean mediaTransmissionTCP = false;
 				Boolean tcpActive = null;
 				for (Object description : mediaDescriptions) {
@@ -233,7 +228,6 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 				}
 				String username = sdp.getOrigin().getUsername();
 				String addressStr = sdp.getOrigin().getAddress();
-				//String sessionName = sdp.getSessionName().getValue();
 				logger.info("[上级点播]用户：{}， 地址：{}:{}， ssrc：{}", username, addressStr, port, ssrc);
 				Device device  = null;
 				// 通过 channel 和 gbStream 是否为null 值判断来源是直播流合适国标
@@ -271,8 +265,10 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 					Long finalStartTime = startTime;
 					Long finalStopTime = stopTime;
 					ZLMHttpHookSubscribe.Event hookEvent = (mediaServerItemInUSe, responseJSON)->{
-						logger.info("[上级点播]收到下级开始点播订阅， {}/{}", sendRtpItem.getApp(), sendRtpItem.getStreamId());
+						logger.info("[上级点播]下级已经开始推流。 回复200OK(SDP)， {}/{}", sendRtpItem.getApp(), sendRtpItem.getStreamId());
-						// if (sendRtpItem == null) return;
+						//     * 0 等待设备推流上来
+						//     * 1 下级已经推流，等待上级平台回复ack
+						//     * 2 推流中
 						sendRtpItem.setStatus(1);
 						redisCatchStorage.updateSendRTPSever(sendRtpItem);
 
@@ -301,9 +297,6 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 						} catch (ParseException e) {
 							e.printStackTrace();
 						}
-						if ("Playback".equals(sessionName) && responseJSON != null) {
-							playService.onPublishHandlerForPlayBack(finalMediaServerItem, responseJSON, finalDevice.getDeviceId(), channelId, null);
-						}
 					};
 					SipSubscribe.Event errorEvent = ((event) -> {
 						// 未知错误。直接转发设备点播的错误
@@ -319,10 +312,29 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 					});
 					if ("Playback".equals(sessionName)) {
 						sendRtpItem.setPlay(false);
-						SSRCInfo ssrcInfo = mediaServerService.openRTPServer(mediaServerItem, sendRtpItem.getSsrc(), true);
 						sendRtpItem.setStreamId(ssrc);
 						SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
-						commander.playbackStreamCmd(mediaServerItem, ssrcInfo, device, channelId, format.format(start), format.format(end), hookEvent, errorEvent);
+						playService.playBack(device.getDeviceId(), channelId, format.format(start), format.format(end),result -> {
+							if (result.getCode() != 0){
+								logger.warn("录像回放失败");
+								if (result.getEvent() != null) {
+									errorEvent.response(result.getEvent());
+								}
+								try {
+									responseAck(evt, Response.REQUEST_TIMEOUT);
+								} catch (SipException e) {
+									e.printStackTrace();
+								} catch (InvalidArgumentException e) {
+									e.printStackTrace();
+								} catch (ParseException e) {
+									e.printStackTrace();
+								}
+							}else {
+								if (result.getMediaServerItem() != null) {
+									hookEvent.response(result.getMediaServerItem(), result.getResponse());
+								}
+							}
+						});
 					}else {
 						sendRtpItem.setPlay(true);
 						StreamInfo streamInfo = redisCatchStorage.queryPlayByDevice(device.getDeviceId(), channelId);
@@ -333,7 +345,7 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 							sendRtpItem.setPlay(false);
 							playService.play(mediaServerItem,device.getDeviceId(), channelId, hookEvent,errorEvent);
 						}else {
-							sendRtpItem.setStreamId(streamInfo.getStreamId());
+							sendRtpItem.setStreamId(streamInfo.getStream());
 							hookEvent.response(mediaServerItem, null);
 						}
 					}
@@ -379,9 +391,24 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 					}
 				}
 
-			} else {
+			}
+
+		} catch (SipException | InvalidArgumentException | ParseException e) {
+			e.printStackTrace();
+			logger.warn("sdp解析错误");
+			e.printStackTrace();
+		} catch (SdpParseException e) {
+			e.printStackTrace();
+		} catch (SdpException e) {
+			e.printStackTrace();
+		}
+	}
+
+	public void inviteFromDeviceHandle(RequestEvent evt, String requesterId) throws InvalidArgumentException, ParseException, SipException, SdpException {
+
 		// 非上级平台请求，查询是否设备请求（通常为接收语音广播的设备）
 		Device device = redisCatchStorage.getDevice(requesterId);
+		Request request = evt.getRequest();
 		if (device != null) {
 			logger.info("收到设备" + requesterId + "的语音广播Invite请求");
 			responseAck(evt, Response.TRYING);
@@ -446,15 +473,4 @@ public class InviteRequestProcessor extends SIPRequestProcessorParent implements
 			responseAck(evt, Response.BAD_REQUEST);
 		}
 	}
-
-		} catch (SipException | InvalidArgumentException | ParseException e) {
-			e.printStackTrace();
-			logger.warn("sdp解析错误");
-			e.printStackTrace();
-		} catch (SdpParseException e) {
-			e.printStackTrace();
-		} catch (SdpException e) {
-			e.printStackTrace();
-		}
-	}
 }

src/main/java/com/genersoft/iot/vmp/service/IMediaServerService.java

@@ -48,7 +48,7 @@ public interface IMediaServerService {
 
     SSRCInfo openRTPServer(MediaServerItem mediaServerItem, String streamId, boolean isPlayback);
 
-    void closeRTPServer(Device device, String channelId, String ssrc);
+    void closeRTPServer(String deviceId, String channelId, String ssrc);
 
     void clearRTPServer(MediaServerItem mediaServerItem);
 

src/main/java/com/genersoft/iot/vmp/service/bean/PlayBackCallback.java

@@ -1,9 +1,10 @@
 package com.genersoft.iot.vmp.service.bean;
 
 import com.genersoft.iot.vmp.gb28181.transmit.callback.RequestMessage;
+import com.genersoft.iot.vmp.vmanager.bean.WVPResult;
 
 public interface PlayBackCallback {
 
-    void call(RequestMessage msg);
+    void call(PlayBackResult<RequestMessage> msg);
 
 }

src/main/java/com/genersoft/iot/vmp/service/bean/PlayBackResult.java

@@ -0,0 +1,55 @@
+package com.genersoft.iot.vmp.service.bean;
+
+import com.alibaba.fastjson.JSONObject;
+import com.genersoft.iot.vmp.gb28181.event.SipSubscribe;
+import com.genersoft.iot.vmp.media.zlm.dto.MediaServerItem;
+
+import javax.sip.RequestEvent;
+
+public class PlayBackResult<T> {
+     private int code;
+     private T data;
+     private MediaServerItem mediaServerItem;
+    private JSONObject response;
+    private SipSubscribe.EventResult event;
+
+    public int getCode() {
+        return code;
+    }
+
+    public void setCode(int code) {
+        this.code = code;
+    }
+
+    public T getData() {
+        return data;
+    }
+
+    public void setData(T data) {
+        this.data = data;
+    }
+
+    public MediaServerItem getMediaServerItem() {
+        return mediaServerItem;
+    }
+
+    public void setMediaServerItem(MediaServerItem mediaServerItem) {
+        this.mediaServerItem = mediaServerItem;
+    }
+
+    public JSONObject getResponse() {
+        return response;
+    }
+
+    public void setResponse(JSONObject response) {
+        this.response = response;
+    }
+
+    public SipSubscribe.EventResult getEvent() {
+        return event;
+    }
+
+    public void setEvent(SipSubscribe.EventResult event) {
+        this.event = event;
+    }
+}

src/main/java/com/genersoft/iot/vmp/service/impl/MediaServerServiceImpl.java

@@ -160,16 +160,16 @@ public class MediaServerServiceImpl implements IMediaServerService {
     }
 
     @Override
-    public void closeRTPServer(Device device, String channelId, String stream) {
+    public void closeRTPServer(String deviceId, String channelId, String stream) {
-        String mediaServerId = streamSession.getMediaServerId(device.getDeviceId(), channelId, stream);
+        String mediaServerId = streamSession.getMediaServerId(deviceId, channelId, stream);
-        String ssrc = streamSession.getSSRC(device.getDeviceId(), channelId, stream);
+        String ssrc = streamSession.getSSRC(deviceId, channelId, stream);
         MediaServerItem mediaServerItem = this.getOne(mediaServerId);
         if (mediaServerItem != null) {
-            String streamId = String.format("%s_%s", device.getDeviceId(), channelId);
+            String streamId = String.format("%s_%s", deviceId, channelId);
             zlmrtpServerFactory.closeRTPServer(mediaServerItem, streamId);
             releaseSsrc(mediaServerItem, ssrc);
         }
-        streamSession.remove(device.getDeviceId(), channelId, stream);
+        streamSession.remove(deviceId, channelId, stream);
     }
 
     @Override

src/main/java/com/genersoft/iot/vmp/service/impl/PlayServiceImpl.java

@@ -17,6 +17,7 @@ import com.genersoft.iot.vmp.media.zlm.ZLMRESTfulUtils;
 import com.genersoft.iot.vmp.media.zlm.dto.MediaServerItem;
 import com.genersoft.iot.vmp.service.IMediaServerService;
 import com.genersoft.iot.vmp.service.bean.PlayBackCallback;
+import com.genersoft.iot.vmp.service.bean.PlayBackResult;
 import com.genersoft.iot.vmp.service.bean.SSRCInfo;
 import com.genersoft.iot.vmp.storager.IRedisCatchStorage;
 import com.genersoft.iot.vmp.storager.IVideoManagerStorager;
@@ -115,11 +116,8 @@ public class PlayServiceImpl implements IPlayService {
             msg.setData(wvpResult);
             // 点播超时回复BYE
             cmder.streamByeCmd(device.getDeviceId(), channelId, streamInfo.getStream());
-            // 释放rtpserver
-            mediaServerService.closeRTPServer(playResult.getDevice(), channelId, streamInfo.getStream());
             // 回复之前所有的点播请求
             resultHolder.invokeAllResult(msg);
-            // TODO 释放ssrc
         });
         result.onCompletion(()->{
             // 点播结束时调用截图接口
@@ -173,7 +171,10 @@ public class PlayServiceImpl implements IPlayService {
                 WVPResult wvpResult = new WVPResult();
                 wvpResult.setCode(-1);
                 // 点播返回sip错误
-                mediaServerService.closeRTPServer(playResult.getDevice(), channelId, ssrcInfo.getStream());
+                mediaServerService.closeRTPServer(playResult.getDevice().getDeviceId(), channelId, ssrcInfo.getStream());
+                // 释放ssrc
+                mediaServerService.releaseSsrc(mediaServerItem, ssrcInfo.getSsrc());
+                streamSession.remove(deviceId, channelId, ssrcInfo.getStream());
                 wvpResult.setMsg(String.format("点播失败， 错误码： %s, %s", event.statusCode, event.msg));
                 msg.setData(wvpResult);
                 resultHolder.invokeAllResult(msg);
@@ -222,7 +223,10 @@ public class PlayServiceImpl implements IPlayService {
                     logger.info("收到订阅消息： " + response.toJSONString());
                     onPublishHandlerForPlay(mediaServerItemInuse, response, deviceId, channelId, uuid);
                 }, (event) -> {
-                    mediaServerService.closeRTPServer(playResult.getDevice(), channelId, ssrcInfo.getStream());
+                    mediaServerService.closeRTPServer(playResult.getDevice().getDeviceId(), channelId, ssrcInfo.getStream());
+                    // 释放ssrc
+                    mediaServerService.releaseSsrc(mediaServerItem, ssrcInfo.getSsrc());
+                    streamSession.remove(deviceId, channelId, ssrcInfo.getStream());
                     WVPResult wvpResult = new WVPResult();
                     wvpResult.setCode(-1);
                     wvpResult.setMsg(String.format("点播失败， 错误码： %s, %s", event.statusCode, event.msg));
@@ -240,7 +244,7 @@ public class PlayServiceImpl implements IPlayService {
         RequestMessage msg = new RequestMessage();
         msg.setId(uuid);
         msg.setKey(DeferredResultHolder.CALLBACK_CMD_PLAY + deviceId + channelId);
-        StreamInfo streamInfo = onPublishHandler(mediaServerItem, resonse, deviceId, channelId);
+        StreamInfo streamInfo = onPublishHandler(mediaServerItem, response, deviceId, channelId);
         if (streamInfo != null) {
             DeviceChannel deviceChannel = storager.queryChannel(deviceId, channelId);
             if (deviceChannel != null) {
@@ -298,9 +302,12 @@ public class PlayServiceImpl implements IPlayService {
         RequestMessage msg = new RequestMessage();
         msg.setId(uuid);
         msg.setKey(key);
+        PlayBackResult<RequestMessage> playBackResult = new PlayBackResult<>();
         result.onTimeout(()->{
             msg.setData("回放超时");
-            callback.call(msg);
+            playBackResult.setCode(-1);
+            playBackResult.setData(msg);
+            callback.call(playBackResult);
         });
         cmder.playbackStreamCmd(newMediaServerItem, ssrcInfo, device, channelId, startTime, endTime, (MediaServerItem mediaServerItem, JSONObject response) -> {
             logger.info("收到订阅消息： " + response.toJSONString());
@@ -308,15 +315,24 @@ public class PlayServiceImpl implements IPlayService {
             if (streamInfo == null) {
                 logger.warn("设备回放API调用失败！");
                 msg.setData("设备回放API调用失败！");
-                callback.call(msg);
+                playBackResult.setCode(-1);
+                playBackResult.setData(msg);
+                callback.call(playBackResult);
                 return;
             }
             redisCatchStorage.startPlayback(streamInfo);
             msg.setData(JSON.toJSONString(streamInfo));
-            callback.call(msg);
+            playBackResult.setCode(0);
+            playBackResult.setData(msg);
+            playBackResult.setMediaServerItem(mediaServerItem);
+            playBackResult.setResponse(response);
+            callback.call(playBackResult);
         }, event -> {
             msg.setData(String.format("回放失败， 错误码： %s, %s", event.statusCode, event.msg));
-            callback.call(msg);
+            playBackResult.setCode(-1);
+            playBackResult.setData(msg);
+            playBackResult.setEvent(event);
+            callback.call(playBackResult);
         });
         return result;
     }

src/main/java/com/genersoft/iot/vmp/vmanager/gb28181/play/PlayController.java

@@ -129,7 +129,6 @@ public class PlayController {
 			//Response response = event.getResponse();
 			msg.setData(String.format("success"));
 			resultHolder.invokeAllResult(msg);
-			mediaServerService.closeRTPServer(device, channelId, streamInfo.getStream());
 		});
 
 		if (deviceId != null || channelId != null) {

src/main/java/com/genersoft/iot/vmp/vmanager/gb28181/playback/PlaybackController.java

@@ -77,8 +77,8 @@ public class PlaybackController {
 			logger.debug(String.format("设备回放 API调用，deviceId：%s ，channelId：%s", deviceId, channelId));
 		}
 
-		DeferredResult<ResponseEntity<String>> result = playService.playBack(deviceId, channelId, startTime, endTime, msg->{
+		DeferredResult<ResponseEntity<String>> result = playService.playBack(deviceId, channelId, startTime, endTime, wvpResult->{
-			resultHolder.invokeResult(msg);
+			resultHolder.invokeResult(wvpResult.getData());
 		});
 
 		return result;