Added protection for GetCapabilities() failure.

webrtc/modules/audio_device/win/audio_mixer_manager_win.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 177 matching lines @@
 
     UINT mixId(0);
     UINT destId(0);
 
     ClearSpeakerState();
 
     // scan all avaliable mixer devices
     for (mixId = 0; mixId < nDevices; mixId++)
     {
         // get capabilities for the specified mixer ID
-        GetCapabilities(mixId, caps);
+        if (!GetCapabilities(mixId, caps))
+            continue;
+
         WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "[mixerID=%d] %s: ", mixId, WideToUTF8(caps.szPname));
         // scan all avaliable destinations for this mixer
         for (destId = 0; destId < caps.cDestinations; destId++)
         {
             GetDestinationLineInfo(mixId, destId, destLine);
             if ((destLine.cControls == 0)                         ||    // no controls or
                 (destLine.cConnections == 0)                      ||    // no source lines or
                 (destLine.fdwLine & MIXERLINE_LINEF_DISCONNECTED) ||    // disconnected or
                 !(destLine.fdwLine & MIXERLINE_LINEF_ACTIVE))           // inactive
             {
@@ skipping 64 matching lines @@
 
     UINT mixId(0);
     UINT destId(0);
 
     ClearMicrophoneState();
 
     // scan all avaliable mixer devices
     for (mixId = 0; mixId < nDevices; mixId++)
     {
         // get capabilities for the specified mixer ID
-        GetCapabilities(mixId, caps);
+        if (!GetCapabilities(mixId, caps))
+            continue;
+
         WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "[mixerID=%d] %s: ", mixId, WideToUTF8(caps.szPname));
         // scan all avaliable destinations for this mixer
         for (destId = 0; destId < caps.cDestinations; destId++)
         {
             GetDestinationLineInfo(mixId, destId, destLine);
 
             if ((destLine.cConnections == 0)                      ||    // no source lines or
                 (destLine.fdwLine & MIXERLINE_LINEF_DISCONNECTED) ||    // disconnected or
                !(destLine.fdwLine & MIXERLINE_LINEF_ACTIVE))            // inactive
             {
@@ skipping 2418 matching lines @@
         if (WideCharToMultiByte(CP_UTF8, 0, src, -1, _str, kStrLen, 0, 0) == 0)
             memset(_str, 0, kStrLen);
     }
     return _str;
 #else
     return const_cast<char*>(src);
 #endif
 }
 
 }  // namespace webrtc