Added video capture capabilities retrieval and caching to VideoCaptureManager

content/browser/renderer_host/media/video_capture_manager_unittest.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.
 
 // Unit test for VideoCaptureManager.
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
@@ skipping 147 matching lines @@
   VideoCaptureControllerID client_id = StartClient(video_session_id, true);
 
   StopClient(client_id);
   vcm_->Close(video_session_id);
 
   // Wait to check callbacks before removing the listener.
   message_loop_->RunUntilIdle();
   vcm_->Unregister();
 }
 
+// Try to enumerate devices, then check their capture capabilities.
+TEST_F(VideoCaptureManagerTest, EnumerateDevicesAndCheckCapabilities) {
+  StreamDeviceInfoArray devices;
+
+  EXPECT_CALL(*listener_, DevicesEnumerated(MEDIA_DEVICE_VIDEO_CAPTURE, _))
+      .Times(1).WillOnce(SaveArg<1>(&devices));
+  vcm_->EnumerateDevices(MEDIA_DEVICE_VIDEO_CAPTURE);
+  message_loop_->RunUntilIdle();
+
+  StreamDeviceInfoArray::iterator device_it;
+  for (device_it = devices.begin(); device_it != devices.end(); ++device_it) {
+    const media::VideoCaptureCapabilities* device_capabilities =
+        vcm_->EnumerateDeviceCapabilities(*device_it);
+    if (device_capabilities == NULL) continue;
+    DCHECK_GE(device_capabilities->size(), 1u);
+
+    media::VideoCaptureCapabilities::const_iterator format;
+    for (format = device_capabilities->begin();
+         format != device_capabilities->end();
+         ++format) {
+      DCHECK_GE(format->width, 1);
+      DCHECK_GE(format->height, 1);
+      DCHECK_GE(format->frame_rate, 1);
+      DVLOG(1) << " Device name: " << device_it->device.name << ", format ("
+               << format->width << "x" << format->height << ")@"
+               << format->frame_rate << "fps";
+    }
+  }
+  vcm_->Unregister();
+}
+
 // Open the same device twice.
 TEST_F(VideoCaptureManagerTest, OpenTwice) {
   StreamDeviceInfoArray devices;
 
   InSequence s;
   EXPECT_CALL(*listener_, DevicesEnumerated(MEDIA_DEVICE_VIDEO_CAPTURE, _))
       .Times(1).WillOnce(SaveArg<1>(&devices));
   EXPECT_CALL(*listener_, Opened(MEDIA_DEVICE_VIDEO_CAPTURE, _)).Times(2);
   EXPECT_CALL(*listener_, Closed(MEDIA_DEVICE_VIDEO_CAPTURE, _)).Times(2);
 
@@ skipping 111 matching lines @@
   // VideoCaptureManager destructor otherwise.
   vcm_->Close(video_session_id);
   StopClient(client_id);
 
   // Wait to check callbacks before removing the listener
   message_loop_->RunUntilIdle();
   vcm_->Unregister();
 }
 
 }  // namespace content