MJPEG acceleration for V4L2

content/browser/renderer_host/media/video_capture_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/media/video_capture_controller.h"
 
 #include <map>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 257 matching lines @@
 
 VideoCaptureController::~VideoCaptureController() {
   STLDeleteContainerPointers(controller_clients_.begin(),
                              controller_clients_.end());
 }
 
 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);
 
   int count = 0;
   if (state_ == VIDEO_CAPTURE_STATE_STARTED) {
     if (!frame->metadata()->HasKey(media::VideoFrameMetadata::FRAME_RATE)) {
       frame->metadata()->SetDouble(media::VideoFrameMetadata::FRAME_RATE,
                                    video_capture_format_.frame_rate);
     }
@@ skipping 125 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   int active_client_count = 0;
   for (ControllerClient* client : controller_clients_) {
     if (!client->paused)
       ++active_client_count;
   }
   return active_client_count;
 }
 
 }  // namespace content