Treat suspended video capture devices on Mac as unavailable.

This change
1. removes suspended cameras from the list of device names,
2. refuses to open suspended cameras, and
3. listens for suspend notifications to re-enumerate devices, and
4. fixes a logic error in QTMonitorImpl (initial count was always zero).

With this change, the internal camera on Mac OS will disappear
from the device list when the lid is closed, and reappear when the lid is
opened.

BUG=https://code.google.com/p/webrtc/issues/detail?id=1109

Review URL: https://codereview.chromium.org/55183002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232487 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 8 insertions, 2 deletions

diff --git a/media/video/capture/mac/video_capture_device_qtkit_mac.mm b/media/video/capture/mac/video_capture_device_qtkit_mac.mm
index e625d13..aa8ae4e 100644
--- a/media/video/capture/mac/video_capture_device_qtkit_mac.mm
+++ b/media/video/capture/mac/video_capture_device_qtkit_mac.mm
@@ -28,8 +28,9 @@
       });
 
   for (QTCaptureDevice* device in captureDevices) {
-    [deviceNames setObject:[device localizedDisplayName]
-                    forKey:[device uniqueID]];
+    if (![[device attributeForKey:QTCaptureDeviceSuspendedAttribute] boolValue])
+      [deviceNames setObject:[device localizedDisplayName]
+                      forKey:[device uniqueID]];
   }
 }
 
@@ -86,6 +87,11 @@
       return NO;
     }
     QTCaptureDevice *device = [captureDevices objectAtIndex:index];
+    if ([[device attributeForKey:QTCaptureDeviceSuspendedAttribute]
+            boolValue]) {
+      DLOG(ERROR) << "Cannot open suspended video capture device.";
+      return NO;
+    }
     NSError *error;
     if (![device open:&error]) {
       DLOG(ERROR) << "Could not open video capture device."