Changing a NOTREACHED to a LOG(WARNING) for cases when a mic isn't connected.

media/audio/win/audio_low_latency_input_win.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/win/audio_low_latency_input_win.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "media/audio/audio_util.h"
@@ skipping 189 matching lines @@
   if (FAILED(hr)) {
     NOTREACHED() << "error code: " << hr;
     return 0.0;
   }
 
   ScopedComPtr<IMMDevice> endpoint_device;
   hr = enumerator->GetDefaultAudioEndpoint(eCapture,
                                            device_role,
                                            endpoint_device.Receive());
   if (FAILED(hr)) {
-    NOTREACHED() << "error code: " << hr;
+    // This will happen if there's no audio capture device found or available
+    // (e.g. some audio cards that have inputs will still report them as
+    // "not found" when no mic is plugged into the input jack).
+    LOG(WARNING) << "No audio end point: " << std::hex << hr;
     return 0.0;
   }
 
   ScopedComPtr<IAudioClient> audio_client;
   hr = endpoint_device->Activate(__uuidof(IAudioClient),
                                  CLSCTX_INPROC_SERVER,
                                  NULL,
                                  audio_client.ReceiveVoid());
   if (FAILED(hr)) {
     NOTREACHED() << "error code: " << hr;
@@ skipping 281 matching lines @@
   hr = audio_client_->SetEventHandle(audio_samples_ready_event_.Get());
   if (FAILED(hr))
     return hr;
 
   // Get access to the IAudioCaptureClient interface. This interface
   // enables us to read input data from the capture endpoint buffer.
   hr = audio_client_->GetService(__uuidof(IAudioCaptureClient),
                                  audio_capture_client_.ReceiveVoid());
   return hr;
 }