Make check for 'opened' consistent across all audio stream implementations of Start() and log an ...

media/audio/mac/audio_low_latency_input_mac.cc

 // Copyright (c) 2011 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 "media/audio/mac/audio_low_latency_input_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 197 matching lines @@
   }
 
   // The hardware latency is fixed and will not change during the call.
   hardware_latency_frames_ = GetHardwareLatency();
 
   return true;
 }
 
 void AUAudioInputStream::Start(AudioInputCallback* callback) {
   DCHECK(callback);
-  if (started_)
+  DLOG_IF(ERROR, !audio_unit_) << "Open() has not been called successfully";
+  if (started_ || !audio_unit_)
     return;
   sink_ = callback;
   OSStatus result = AudioOutputUnitStart(audio_unit_);
   if (result == noErr) {
     started_ = true;
   }
   DLOG_IF(ERROR, result != noErr) << "Failed to start acquiring data";
 }
 
 void AUAudioInputStream::Stop() {
@@ skipping 203 matching lines @@
   // Total latency is composed by the dynamic latency and the fixed
   // hardware latency.
   return (delay_frames + hardware_latency_frames_);
 }
 
 void AUAudioInputStream::HandleError(OSStatus err) {
   NOTREACHED() << "error code: " << err;
   if (sink_)
     sink_->OnError(this, static_cast<int>(err));
 }