AVFoundation: Check selector when testing if max frame rate setting is supported.

media/video/capture/mac/video_capture_device_avfoundation_mac.mm

 // Copyright 2013 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.
 
 #import "media/video/capture/mac/video_capture_device_avfoundation_mac.h"
 
 #import <CoreVideo/CoreVideo.h>
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
+#include "base/mac/scoped_nsexception_enabler.h"
 #include "media/video/capture/mac/video_capture_device_mac.h"
 #include "ui/gfx/size.h"
 
 @implementation VideoCaptureDeviceAVFoundation
 
 #pragma mark Class methods
 
 + (void)getDeviceNames:(NSMutableDictionary*)deviceNames {
   // At this stage we already know that AVFoundation is supported and the whole
   // library is loaded and initialised, by the device monitoring.
@@ skipping 140 matching lines @@
         AVFoundationGlue::AVVideoScalingModeResizeAspect()
   };
   [captureVideoDataOutput_ setVideoSettings:videoSettingsDictionary];
 
   CrAVCaptureConnection* captureConnection = [captureVideoDataOutput_
       connectionWithMediaType:AVFoundationGlue::AVMediaTypeVideo()];
   if ([captureConnection isVideoMinFrameDurationSupported]) {
     [captureConnection setVideoMinFrameDuration:
         CoreMediaGlue::CMTimeMake(1, frameRate)];
   }
+  // TODO(mcasas): Allow exceptions in the following call, related to bugs
+  // http://crbug.com/327532 and http://crbug.com/328096.
+  base::mac::ScopedNSExceptionEnabler enabler;
   if ([captureConnection isVideoMaxFrameDurationSupported]) {

[Robert Sesek, 2013/12/16 15:41:35]

Instead, if ([captureConnection
respondsToSelector:@selector(isVideoMaxFrameDurationSupported] &&
[captureConnection isVideoMaxFrameDurationSupported]) {
}

     [captureConnection setVideoMaxFrameDuration:
         CoreMediaGlue::CMTimeMake(1, frameRate)];
   }
   return YES;
 }
 
 - (BOOL)startCapture {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!captureSession_) {
     DLOG(ERROR) << "Video capture session not initialized.";
@@ skipping 49 matching lines @@
 
 - (void)onVideoError:(NSNotification*)errorNotification {
   NSError* error = base::mac::ObjCCast<NSError>([[errorNotification userInfo]
       objectForKey:AVFoundationGlue::AVCaptureSessionErrorKey()]);
   base::AutoLock lock(lock_);
   if (frameReceiver_)
     frameReceiver_->ReceiveError([[error localizedDescription] UTF8String]);
 }
 
 @end