Move SwizzleCoreAudioLayout5_1() closer to where it's called.

media/audio/mac/audio_low_latency_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_low_latency_output_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "media/audio/audio_util.h"
 #include "media/audio/mac/audio_manager_mac.h"
 
-using media::SwizzleCoreAudioLayout5_1;
+// Reorder PCM from AAC layout to Core Audio 5.1 layout.
+// TODO(fbarchard): Switch layout when ffmpeg is updated.
+template<class Format>
+static void SwizzleCoreAudioLayout5_1(Format* b, uint32 filled) {
+  static const int kNumSurroundChannels = 6;
+  Format aac[kNumSurroundChannels];
+  for (uint32 i = 0; i < filled; i += sizeof(aac), b += kNumSurroundChannels) {
+    memcpy(aac, b, sizeof(aac));
+    b[0] = aac[1];  // L
+    b[1] = aac[2];  // R
+    b[2] = aac[0];  // C
+    b[3] = aac[5];  // LFE
+    b[4] = aac[3];  // Ls
+    b[5] = aac[4];  // Rs
+  }
+}
 
 // Overview of operation:
 // 1) An object of AUAudioOutputStream is created by the AudioManager
 // factory: audio_man->MakeAudioStream().
 // 2) Next some thread will call Open(), at that point the underlying
 // default output Audio Unit is created and configured.
 // 3) Then some thread will call Start(source).
 // Then the Audio Unit is started which creates its own thread which
 // periodically will call the source for more data as buffers are being
 // consumed.
@@ skipping 214 matching lines @@
                                       0,
                                       0,
                                       &info_size,
                                       &nominal_sample_rate);
   DCHECK_EQ(result, 0);
   if (result)
     return 0.0;  // error
 
   return nominal_sample_rate;
 }