Coverity: Initialize member variables.

media/audio/mac/audio_output_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_output_mac.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/audio/audio_util.h"
@@ skipping 49 matching lines @@
   // frame fields identify the set of n |channels|. In uncompressed audio, a
   // packet is always one frame.
   format_.mSampleRate = params.sample_rate;
   format_.mFormatID = kAudioFormatLinearPCM;
   format_.mFormatFlags = kLinearPCMFormatFlagIsPacked;
   format_.mBitsPerChannel = params.bits_per_sample;
   format_.mChannelsPerFrame = params.channels;
   format_.mFramesPerPacket = 1;
   format_.mBytesPerPacket = (format_.mBitsPerChannel * params.channels) / 8;
   format_.mBytesPerFrame = format_.mBytesPerPacket;
+  format_.mReserved = 0;
 
+  memset(buffer_, 0, sizeof(buffer_));
   memset(core_channel_orderings_, 0, sizeof(core_channel_orderings_));
   memset(channel_remap_, 0, sizeof(channel_remap_));
 
   if (params.bits_per_sample > 8) {
     format_.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
   }
 
   // Silence buffer has a duration of 6ms to simulate the behavior of Windows.
   // This value is choosen by experiments and macs cannot keep up with
   // anything less than 6ms.
@@ skipping 407 matching lines @@
       HandleError(err);
       return;
     }
   }
   err  = AudioQueueStart(audio_queue_, NULL);
   if (err != noErr) {
     HandleError(err);
     return;
   }
 }