From d80d506360adab30cee64a4e2ec61c96075527bb Mon Sep 17 00:00:00 2001
From: kalman <kalmanxiong@slightech.com>
Date: Sat, 1 Sep 2018 20:47:35 +0800
Subject: [PATCH] Throw error in v4l2 when time out

---
 src/uvc/uvc-v4l2.cc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/uvc/uvc-v4l2.cc b/src/uvc/uvc-v4l2.cc
index a064552..b530cb4 100755
--- a/src/uvc/uvc-v4l2.cc
+++ b/src/uvc/uvc-v4l2.cc
@@ -41,6 +41,9 @@ namespace uvc {
     LOG(severity) << str << " error " << errno << ", " << strerror(errno); \
   } while (0)
 
+#define NO_DATA_MAX_COUNT 200
+
+int no_data_count = 0;
 /*
 class device_error : public std::exception {
  public:
@@ -194,6 +197,7 @@ struct device {
   ~device() {
     VLOG(2) << __func__;
     stop_streaming();
+    no_data_count = 0;
     if (fd != -1 && close(fd) < 0) {
       LOG_ERROR(WARNING, "close");
     }
@@ -386,6 +390,14 @@ struct device {
             throw_error("VIDIOC_QBUF");
         });
       }
+
+      no_data_count = 0;
+    } else {
+      no_data_count++;
+    }
+
+    if (no_data_count > NO_DATA_MAX_COUNT) {
+      throw_error("v4l2 get stream time out!");
     }
   }