MJPEG acceleration for V4L2

content/browser/renderer_host/media/video_capture_controller.cc

Index: content/browser/renderer_host/media/video_capture_controller.cc
diff --git a/content/browser/renderer_host/media/video_capture_controller.cc b/content/browser/renderer_host/media/video_capture_controller.cc
index 23ee7074a2d73a365000d5369b39d28e50b2adc8..cfd6f7be3ceda0b0a1b6be5b18a4ba5b98d7a879 100644
--- a/content/browser/renderer_host/media/video_capture_controller.cc
+++ b/content/browser/renderer_host/media/video_capture_controller.cc
@@ -275,6 +275,61 @@ void VideoCaptureController::DoIncomingCapturedVideoFrameOnIOThread(
     scoped_ptr<media::VideoCaptureDevice::Client::Buffer> buffer,
     const scoped_refptr<VideoFrame>& frame,
     const base::TimeTicks& timestamp) {
+
+  {
+    static int count = 0;
+    static base::TimeDelta total_time;
+    static base::TimeDelta min_delta = base::TimeDelta::Max();
+    static base::TimeDelta max_delta;
+    static base::TimeDelta v[30];
+    count++;
+    base::TimeDelta delta = base::TimeTicks::Now() - timestamp;
+    total_time += delta;
+    if (delta > max_delta)
+      max_delta = delta;
+    if (delta < min_delta)
+      min_delta = delta;
+    v[(count-1) % 30] = delta;
+    if (count % 30 == 0) {
+      LOG(ERROR) << "count=" << count
+                 << ", latency=" << delta.InMillisecondsF()
+                 << ", avg=" << total_time.InMillisecondsF() / count
+                 << ", min=" << min_delta.InMillisecondsF()
+                 << ", max=" << max_delta.InMillisecondsF();
+
+      LOG(ERROR) << v[0].InMillisecondsF() << " "
+                 << v[1].InMillisecondsF() << " "
+                 << v[2].InMillisecondsF() << " "
+                 << v[3].InMillisecondsF() << " "
+                 << v[4].InMillisecondsF() << " "
+                 << v[5].InMillisecondsF() << " "
+                 << v[6].InMillisecondsF() << " "
+                 << v[7].InMillisecondsF() << " "
+                 << v[8].InMillisecondsF() << " "
+                 << v[9].InMillisecondsF() << " "
+                 << v[10].InMillisecondsF() << " "
+                 << v[11].InMillisecondsF() << " "
+                 << v[12].InMillisecondsF() << " "
+                 << v[13].InMillisecondsF() << " "
+                 << v[14].InMillisecondsF() << " "
+                 << v[15].InMillisecondsF() << " "
+                 << v[16].InMillisecondsF() << " "
+                 << v[17].InMillisecondsF() << " "
+                 << v[18].InMillisecondsF() << " "
+                 << v[19].InMillisecondsF() << " "
+                 << v[20].InMillisecondsF() << " "
+                 << v[21].InMillisecondsF() << " "
+                 << v[22].InMillisecondsF() << " "
+                 << v[23].InMillisecondsF() << " "
+                 << v[24].InMillisecondsF() << " "
+                 << v[25].InMillisecondsF() << " "
+                 << v[26].InMillisecondsF() << " "
+                 << v[27].InMillisecondsF() << " "
+                 << v[28].InMillisecondsF() << " "
+                 << v[29].InMillisecondsF();
+    }
+  }
+
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   const int buffer_id = buffer->id();
   DCHECK_NE(buffer_id, VideoCaptureBufferPool::kInvalidId);