Add yolov7 multi thread.

Signed-off-by: lijian <lijian6@sugon.com>

src/YOLOV7.cpp

@@ -96,7 +96,9 @@ static void DecoderThreadFunc(Queue* queue)
 		    memcpy(srcImage.data + decoder.frame->width * decoder.frame->height,     (unsigned char*)decoder.frame->data[1], decoder.frame->width * decoder.frame->height/4);
 		    memcpy(srcImage.data + decoder.frame->width * decoder.frame->height*5/4, (unsigned char*)decoder.frame->data[2], decoder.frame->width * decoder.frame->height/4);
 		    cvtColor(srcImage, srcImage, COLOR_YUV420p2RGB);
+		    fprintf(stdout, "Decode enQueue one frame start\n");
 		    que->enQueue(srcImage);
+		    fprintf(stdout, "Decode enQueue one frame end\n");
 		}
 		if (que->device == _HW || que->device == _HW_DMA)
 		{
@@ -309,16 +311,31 @@ static void DetectorThreadFunc(Queue* que)
 
 void Sample_DetectorYOLOV7(int device)
 {
-    Queue* queue = new Queue(1);
-    queue->device = device;
+    int numThread = 5;
+    std::vector<Queue*> queues;
+    std::vector<std::thread> threadsDecoder;
+    std::vector<std::thread> threadsDetector;
 
-    std::thread ThreadDecoder(DecoderThreadFunc, queue);
-    std::thread ThreadDetector(DetectorThreadFunc, queue);
+    for (int i = 0; i < numThread; ++i) {
+        Queue* queue = new Queue(1);
+        queues.push_back(queue);
+    }
+    for (int i = 0; i < numThread; ++i) {
+	queues[i]->device = device;
+        threadsDecoder.emplace_back(DecoderThreadFunc, queues[i]);
+        threadsDetector.emplace_back(DetectorThreadFunc, queues[i]);
+    }
 
-    ThreadDecoder.join();
-    ThreadDetector.join();
+    for (auto& thread : threadsDecoder) {
+        thread.join();
+    }
+    for (auto& thread : threadsDetector) {
+        thread.join();
+    }
 
-    delete queue;
-    queue = NULL;
+    for (auto queue : queues) {
+        delete queue;
+	queue = NULL;
+    }
     return;
 }