修复停止之后屏幕不变黑的问题，原因是停止的时候，已经有之前的视频帧数据在队列中进行解码，解码完成后会继续被送去显示

VideoDecoder/src/VideoReader/hid_thread.cpp

 #include "hid_thread.h"
-
 #include <QDebug>
 #include "usb/USBOperator.h"
 #include<QApplication>
 #define MAX_PAYLOAD 1012
+
 typedef struct USB_FRAM_S{
     int head;
     int id;
@@ -67,6 +67,7 @@ void hid_thread::run()
                 //开始投屏
                 if(pUsbFram1->buff[0] == 0x01&&pUsbFram1->buff[1] == 0x01){
                     cout<<"start screen shot"<<endl;
+                    isPlay=true;
                     char usb_buf_re[2049] = {0};
                     memcpy(&usb_buf_re[1],buffer, 2048);
                     hid_write(hid_fd,(unsigned char *)usb_buf_re,2049);
@@ -74,6 +75,7 @@ void hid_thread::run()
                 }
                 if(pUsbFram1->buff[0] == 0x02&&pUsbFram1->buff[1] == 0x02){
                     cout<<"stop screen shot"<<endl;
+                    isPlay=false;
                     char usb_buf_re[2049] = {0};
                     memcpy(&usb_buf_re[1],buffer, 2048);
                     hid_write(hid_fd,(unsigned char *)usb_buf_re,2049);
@@ -99,13 +101,16 @@ void hid_thread::run()
                 //开始投屏
                 if(pUsbFram2->buff[0] == 0x01&&pUsbFram2->buff[1] == 0x01){
                     cout<<"start screen shot"<<endl;
+                    isPlay=true;
                     char usb_buf_re[2049] = {0};
                     memcpy(&usb_buf_re[1024],buffer, 2048);
                     hid_write(hid_fd,(unsigned char *)usb_buf_re,2049);
                     mcb(SCREEN_SHOT_START);
+
                 }
                 if(pUsbFram2->buff[0] == 0x02&&pUsbFram2->buff[1] == 0x02){
                     cout<<"stop screen shot"<<endl;
+                    isPlay=false;
                     char usb_buf_re[2049] = {0};
                     memcpy(&usb_buf_re[1024],buffer, 2048);
                     hid_write(hid_fd,(unsigned char *)usb_buf_re,2049);
@@ -115,7 +120,10 @@ void hid_thread::run()
             continue;
         }
 
-
+        if(isPlay==false){
+            mcb(SCREEN_SHOT_STOP);
+            continue;
+        }
 
         if(pUsbFram1->head == 0x44332211) {
             while (pNaluParsing->lock) {
@@ -148,6 +156,8 @@ void hid_thread::run()
             }
             frameId=pUsbFram2->id;
         }
+
+
     }
 }
 void hid_thread::setCallback(Func cb){

VideoDecoder/src/VideoReader/hid_thread.h

@@ -5,12 +5,15 @@
 #include "NALUParsing.h"
 #include "usb/hidapi.h"
 #include "iostream"
+
+
 using namespace std;
 typedef std::function<void(int s)> Func;
 class hid_thread:public QThread
 {
 
 public:
+    bool isPlay=false;
     hid_device *hid_fd;
     NALUParsing *pNaluParsing;
     void setCallback(Func cb);

src/mainwindow.cpp

@@ -99,6 +99,9 @@ void MainWindow::slotBtnClick(bool isChecked)
 ///显示视频数据，此函数不宜做耗时操作，否则会影响播放的流畅性。
 void MainWindow::onDisplayVideo(std::shared_ptr<VideoFrame> videoFrame, int frameNum)
 {
+    if(hidThread->isPlay==false){
+        return;
+    }
     ui->label_frameNum->setText(QString("%1").arg(frameNum));
     ui->widget_videoPlayer->inputOneFrame(videoFrame);