From a57edded4b2fefe605abd1c3293f7351a66e7140 Mon Sep 17 00:00:00 2001
From: Kalman <kalmanxiong@slightech.com>
Date: Mon, 5 Nov 2018 16:23:32 +0800
Subject: [PATCH] Add pulse detection

---
 src/uvc/uvc-v4l2.cc | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/uvc/uvc-v4l2.cc b/src/uvc/uvc-v4l2.cc
index a064552..afbc7ed 100755
--- a/src/uvc/uvc-v4l2.cc
+++ b/src/uvc/uvc-v4l2.cc
@@ -41,6 +41,11 @@ namespace uvc {
     LOG(severity) << str << " error " << errno << ", " << strerror(errno); \
   } while (0)
 
+#define NO_DATA_MAX_COUNT 200
+#define LIVING_MAX_COUNT 9000
+
+int no_data_count = 0;
+int living_count = 0;
 /*
 class device_error : public std::exception {
  public:
@@ -385,7 +390,25 @@ struct device {
           if (xioctl(fd, VIDIOC_QBUF, &buf) < 0)
             throw_error("VIDIOC_QBUF");
         });
+        if (living_count < LIVING_MAX_COUNT) {
+          living_count++;
+        } else {
+          living_count = 0;
+          LOG(INFO) << "UVC pulse detection,Please ignore.";
+        }
       }
+
+      no_data_count = 0;
+    } else {
+      no_data_count++;
+    }
+
+    if (no_data_count > NO_DATA_MAX_COUNT) {
+      no_data_count = 0;
+      living_count = 0;
+      LOG(WARNING) << __func__ << "v4l2 get stream time out,Try to reboot!";
+      stop_capture();
+      start_capture();
     }
   }