Introduce AudioHardwareConfig for renderer side audio device info.

media/audio/audio_output_controller.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/audio_output_controller.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/message_loop.h"
 #include "base/threading/platform_thread.h"
 #include "base/time.h"
 #include "build/build_config.h"
+#include "media/audio/audio_util.h"
 #include "media/audio/shared_memory_util.h"
 
 using base::Time;
 using base::TimeDelta;
 
 namespace media {
 
 // Polling-related constants.
 const int AudioOutputController::kPollNumAttempts = 3;
 const int AudioOutputController::kPollPauseInMilliseconds = 3;
@@ skipping 298 matching lines @@
       diverting_to_stream_ = NULL;
     stream_ = NULL;
   }
 
   state_ = kEmpty;
 }
 
 void AudioOutputController::OnDeviceChange() {
   DCHECK(message_loop_->BelongsToCurrentThread());
 
+  // TODO(dalecurtis): Notify the renderer side that a device change has
+  // occurred.  Currently querying the hardware information here will lead to
+  // crashes on OSX.  See http://crbug.com/158170.
+
   // Recreate the stream (DoCreate() will first shut down an existing stream).
   // Exit if we ran into an error.
   const State original_state = state_;
   DoCreate(true);
   if (!stream_ || state_ == kError)
     return;
 
   // Get us back to the original state or an equivalent state.
   switch (original_state) {
     case kStarting:
@@ skipping 55 matching lines @@
   DCHECK(base::AtomicRefCountIsZero(&num_allowed_io_));
   base::AtomicRefCountInc(&num_allowed_io_);
 }
 
 void AudioOutputController::DisallowEntryToOnMoreIOData() {
   const bool is_zero = !base::AtomicRefCountDec(&num_allowed_io_);
   DCHECK(is_zero);
 }
 
 }  // namespace media