Clear the FIFO when calling input stream::Stop()

media/audio/mac/audio_low_latency_input_mac.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 "media/audio/mac/audio_low_latency_input_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 268 matching lines @@
 }
 
 void AUAudioInputStream::Stop() {
   if (!started_)
     return;
   StopAgc();
   OSStatus result = AudioOutputUnitStop(audio_unit_);
   DCHECK_EQ(result, noErr);
   started_ = false;
   sink_ = NULL;
+  fifo_.Clear();
 
   OSSTATUS_DLOG_IF(ERROR, result != noErr, result)
       << "Failed to stop acquiring data";
 }
 
 void AUAudioInputStream::Close() {
   // It is valid to call Close() before calling open or Start().
   // It is also valid to call Close() after Start() has been called.
   if (started_) {
     Stop();
@@ skipping 347 matching lines @@
     kAudioDevicePropertyScopeInput,
     static_cast<UInt32>(channel)
   };
   OSStatus result = AudioObjectIsPropertySettable(input_device_id_,
                                                   &property_address,
                                                   &is_settable);
   return (result == noErr) ? is_settable : false;
 }
 
 }  // namespace media