trunk/src/system_wrappers/source/trace_impl.cc - vendor/opensource/webrtc - Git at Google

 /*
  *  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.
  */

 #include "trace_impl.h"

 #include <cassert>
 #include <string.h> // memset

 #ifdef _WIN32
 #include "trace_win.h"
 #else
 #include <stdio.h>
 #include <time.h>
 #include <stdarg.h>
 #include "trace_posix.h"
 #endif // _WIN32

 #define KEY_LEN_CHARS 31

 #ifdef _WIN32
     #pragma warning(disable:4355)
 // VS 2005: Disable warnings for default initialized arrays.
     #pragma warning(disable:4351)
 #endif // _WIN32

 namespace webrtc {
 static WebRtc_UWord32 levelFilter = kTraceDefault;

 // Construct On First Use idiom. Avoids "static initialization order fiasco".
 TraceImpl* TraceImpl::StaticInstance(CountOperation count_operation,
                                      const TraceLevel level)
 {
     // Sanities to avoid taking lock unless absolutely necessary (for
     // performance reasons).
     // count_operation == kAddRefNoCreate implies that a message will be
     // written to file.
     if((level != kTraceAll) && (count_operation == kAddRefNoCreate))
     {
         if(!(level & levelFilter))
         {
             return NULL;
         }
     }
     TraceImpl* impl =
         GetStaticInstance<TraceImpl>(count_operation);
     return impl;
 }

 TraceImpl* TraceImpl::GetTrace(const TraceLevel level)
 {
     return StaticInstance(kAddRefNoCreate, level);
 }

 TraceImpl* TraceImpl::CreateInstance()
 {
 #if defined(_WIN32)
     return new TraceWindows();
 #else
     return new TracePosix();
 #endif
 }

 TraceImpl::TraceImpl()
     : _critsectInterface(CriticalSectionWrapper::CreateCriticalSection()),
       _callback(NULL),
       _rowCountText(0),
       _fileCountText(0),
       _traceFile(*FileWrapper::Create()),
       _thread(*ThreadWrapper::CreateThread(TraceImpl::Run, this,
                                            kHighestPriority, "Trace")),
       _event(*EventWrapper::Create()),
       _critsectArray(CriticalSectionWrapper::CreateCriticalSection()),
       _nextFreeIdx(),
       _level(),
       _length(),
       _messageQueue(),
       _activeQueue(0)
 {
     _nextFreeIdx[0] = 0;
     _nextFreeIdx[1] = 0;

     unsigned int tid = 0;
     _thread.Start(tid);

     for(int m = 0; m < WEBRTC_TRACE_NUM_ARRAY; m++)
     {
         for(int n = 0; n < WEBRTC_TRACE_MAX_QUEUE; n++)
         {
             _messageQueue[m][n] = new
                 char[WEBRTC_TRACE_MAX_MESSAGE_SIZE];
         }
     }
 }

 bool TraceImpl::StopThread()
 {
     // Release the worker thread so that it can flush any lingering messages.
     _event.Set();

     // Allow 10 ms for pending messages to be flushed out.
     // TODO (hellner): why not use condition variables to do this? Or let the
     //                 worker thread die and let this thread flush remaining
     //                 messages?
 #ifdef _WIN32
     Sleep(10);
 #else
     timespec t;
     t.tv_sec = 0;
     t.tv_nsec = 10*1000000;
     nanosleep(&t,NULL);
 #endif

     _thread.SetNotAlive();
     // Make sure the thread finishes as quickly as possible (instead of having
     // to wait for the timeout).
     _event.Set();
     bool stopped = _thread.Stop();

     CriticalSectionScoped lock(_critsectInterface);
     _traceFile.Flush();
     _traceFile.CloseFile();
     return stopped;
 }

 TraceImpl::~TraceImpl()
 {
     StopThread();
     delete &_event;
     delete &_traceFile;
     delete &_thread;
     delete _critsectInterface;
     delete _critsectArray;

     for(int m = 0; m < WEBRTC_TRACE_NUM_ARRAY; m++)
     {
         for(int n = 0; n < WEBRTC_TRACE_MAX_QUEUE; n++)
         {
             delete [] _messageQueue[m][n];
         }
     }
 }

 WebRtc_Word32 TraceImpl::AddThreadId(char* traceMessage) const {
   WebRtc_UWord32 threadId = ThreadWrapper::GetThreadId();
   // Messages is 12 characters.
   return sprintf(traceMessage, "%10u; ", threadId);
 }

 WebRtc_Word32 TraceImpl::AddLevel(char* szMessage, const TraceLevel level) const
 {
     switch (level)
     {
         case kTraceStateInfo:
             sprintf (szMessage, "STATEINFO ; ");
             break;
         case kTraceWarning:
             sprintf (szMessage, "WARNING   ; ");
             break;
         case kTraceError:
             sprintf (szMessage, "ERROR     ; ");
             break;
         case kTraceCritical:
             sprintf (szMessage, "CRITICAL  ; ");
             break;
         case kTraceInfo:
             sprintf (szMessage, "DEBUGINFO ; ");
             break;
         case kTraceModuleCall:
             sprintf (szMessage, "MODULECALL; ");
             break;
         case kTraceMemory:
             sprintf (szMessage, "MEMORY    ; ");
             break;
         case kTraceTimer:
             sprintf (szMessage, "TIMER     ; ");
             break;
         case kTraceStream:
             sprintf (szMessage, "STREAM    ; ");
             break;
         case kTraceApiCall:
             sprintf (szMessage, "APICALL   ; ");
             break;
         case kTraceDebug:
             sprintf (szMessage, "DEBUG     ; ");
             break;
         default:
             assert(false);
             return 0;
     }
     // All messages are 12 characters.
     return 12;
 }

 WebRtc_Word32 TraceImpl::AddModuleAndId(char* traceMessage,
                                         const TraceModule module,
                                         const WebRtc_Word32 id) const
 {
     // Use long int to prevent problems with different definitions of
     // WebRtc_Word32.
     // TODO (hellner): is this actually a problem? If so, it should be better to
     //                 clean up WebRtc_Word32
     const long int idl = id;
     if(idl != -1)
     {
         const unsigned long int idEngine = id>>16;
         const unsigned long int idChannel = id & 0xffff;

         switch (module)
         {
             case kTraceVoice:
                 sprintf(traceMessage, "       VOICE:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceVideo:
                 sprintf(traceMessage, "       VIDEO:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceUtility:
                 sprintf(traceMessage, "     UTILITY:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceRtpRtcp:
                 sprintf(traceMessage, "    RTP/RTCP:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceTransport:
                 sprintf(traceMessage, "   TRANSPORT:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceAudioCoding:
                 sprintf(traceMessage, "AUDIO CODING:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceSrtp:
                 sprintf(traceMessage, "        SRTP:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceAudioMixerServer:
                 sprintf(traceMessage, " AUDIO MIX/S:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceAudioMixerClient:
                 sprintf(traceMessage, " AUDIO MIX/C:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceVideoCoding:
                 sprintf(traceMessage, "VIDEO CODING:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceVideoMixer:
                 // Print sleep time and API call
                 sprintf(traceMessage, "   VIDEO MIX:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceFile:
                 sprintf(traceMessage, "        FILE:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceAudioProcessing:
                 sprintf(traceMessage, "  AUDIO PROC:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceAudioDevice:
                 sprintf(traceMessage, "AUDIO DEVICE:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceVideoRenderer:
                 sprintf(traceMessage, "VIDEO RENDER:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceVideoCapture:
                 sprintf(traceMessage, "VIDEO CAPTUR:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
             case kTraceVideoPreocessing:
                 sprintf(traceMessage, "  VIDEO PROC:%5ld %5ld;", idEngine,
                         idChannel);
                 break;
         }
     } else {
         switch (module)
         {
             case kTraceVoice:
                 sprintf (traceMessage, "       VOICE:%11ld;", idl);
                 break;
             case kTraceVideo:
                 sprintf (traceMessage, "       VIDEO:%11ld;", idl);
                 break;
             case kTraceUtility:
                 sprintf (traceMessage, "     UTILITY:%11ld;", idl);
                 break;
             case kTraceRtpRtcp:
                 sprintf (traceMessage, "    RTP/RTCP:%11ld;", idl);
                 break;
             case kTraceTransport:
                 sprintf (traceMessage, "   TRANSPORT:%11ld;", idl);
                 break;
             case kTraceAudioCoding:
                 sprintf (traceMessage, "AUDIO CODING:%11ld;", idl);
                 break;
             case kTraceSrtp:
                 sprintf (traceMessage, "        SRTP:%11ld;", idl);
                 break;
             case kTraceAudioMixerServer:
                 sprintf (traceMessage, " AUDIO MIX/S:%11ld;", idl);
                 break;
             case kTraceAudioMixerClient:
                 sprintf (traceMessage, " AUDIO MIX/C:%11ld;", idl);
                 break;
             case kTraceVideoCoding:
                 sprintf (traceMessage, "VIDEO CODING:%11ld;", idl);
                 break;
             case kTraceVideoMixer:
                 sprintf (traceMessage, "   VIDEO MIX:%11ld;", idl);
                 break;
             case kTraceFile:
                 sprintf (traceMessage, "        FILE:%11ld;", idl);
                 break;
             case kTraceAudioProcessing:
                 sprintf (traceMessage, "  AUDIO PROC:%11ld;", idl);
                 break;
             case kTraceAudioDevice:
                 sprintf (traceMessage, "AUDIO DEVICE:%11ld;", idl);
                 break;
             case kTraceVideoRenderer:
                 sprintf (traceMessage, "VIDEO RENDER:%11ld;", idl);
                 break;
             case kTraceVideoCapture:
                 sprintf (traceMessage, "VIDEO CAPTUR:%11ld;", idl);
                 break;
             case kTraceVideoPreocessing:
                 sprintf (traceMessage, "  VIDEO PROC:%11ld;", idl);
                 break;
         }
     }
     // All messages are 25 characters.
     return 25;
 }

 WebRtc_Word32 TraceImpl::SetTraceFileImpl(const char* fileNameUTF8,
                                           const bool addFileCounter)
 {
     CriticalSectionScoped lock(_critsectInterface);

     _traceFile.Flush();
     _traceFile.CloseFile();

     if(fileNameUTF8)
     {
         if(addFileCounter)
         {
             _fileCountText = 1;

             char fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize];
             CreateFileName(fileNameUTF8, fileNameWithCounterUTF8,
                            _fileCountText);
             if(_traceFile.OpenFile(fileNameWithCounterUTF8, false, false,
                                    true) == -1)
             {
                 return -1;
             }
         }else {
             _fileCountText = 0;
             if(_traceFile.OpenFile(fileNameUTF8, false, false, true) == -1)
             {
                 return -1;
             }
         }
     }
     _rowCountText = 0;
     return 0;
 }

 WebRtc_Word32 TraceImpl::TraceFileImpl(
     char fileNameUTF8[FileWrapper::kMaxFileNameSize])
 {
     CriticalSectionScoped lock(_critsectInterface);
     return _traceFile.FileName(fileNameUTF8, FileWrapper::kMaxFileNameSize);
 }

 WebRtc_Word32 TraceImpl::SetTraceCallbackImpl(TraceCallback* callback)
 {
     CriticalSectionScoped lock(_critsectInterface);
     _callback = callback;
     return 0;
 }

 WebRtc_Word32 TraceImpl::AddMessage(
     char* traceMessage,
     const char msg[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
     const WebRtc_UWord16 writtenSoFar) const

 {
     int length = 0;
     if(writtenSoFar >= WEBRTC_TRACE_MAX_MESSAGE_SIZE)
     {
         return -1;
     }
     // - 2 to leave room for newline and NULL termination
 #ifdef _WIN32
     length = _snprintf(traceMessage,
                        WEBRTC_TRACE_MAX_MESSAGE_SIZE - writtenSoFar - 2,
                        "%s",msg);
     if(length < 0)
     {
         length = WEBRTC_TRACE_MAX_MESSAGE_SIZE - writtenSoFar - 2;
         traceMessage[length] = 0;
     }
 #else
     length = snprintf(traceMessage,
                       WEBRTC_TRACE_MAX_MESSAGE_SIZE-writtenSoFar-2, "%s",msg);
     if(length < 0 || length > WEBRTC_TRACE_MAX_MESSAGE_SIZE-writtenSoFar - 2)
     {
         length = WEBRTC_TRACE_MAX_MESSAGE_SIZE - writtenSoFar - 2;
         traceMessage[length] = 0;
     }
 #endif
     // Length with NULL termination.
     return length+1;
 }

 void TraceImpl::AddMessageToList(
     const char traceMessage[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
     const WebRtc_UWord16 length,
     const TraceLevel level)
 {
     CriticalSectionScoped lock(_critsectArray);

     if(_nextFreeIdx[_activeQueue] >= WEBRTC_TRACE_MAX_QUEUE)
     {
         if( ! _traceFile.Open() &&
             !_callback)
         {
             // Keep at least the last 1/4 of old messages when not logging.
             // TODO (hellner): isn't this redundant. The user will make it known
             //                 when to start logging. Why keep messages before
             //                 that?
             for(int n = 0; n < WEBRTC_TRACE_MAX_QUEUE/4; n++)
             {
                 const int lastQuarterOffset = (3*WEBRTC_TRACE_MAX_QUEUE/4);
                 memcpy(_messageQueue[_activeQueue][n],
                        _messageQueue[_activeQueue][n + lastQuarterOffset],
                        WEBRTC_TRACE_MAX_MESSAGE_SIZE);
             }
             _nextFreeIdx[_activeQueue] = WEBRTC_TRACE_MAX_QUEUE/4;
         } else {
             // More messages are being written than there is room for in the
             // buffer. Drop any new messages.
             // TODO (hellner): its probably better to drop old messages instead
             //                 of new ones. One step further: if this happens
             //                 it's due to writing faster than what can be
             //                 processed. Maybe modify the filter at this point.
             //                 E.g. turn of STREAM.
             return;
         }
     }

     WebRtc_UWord16 idx = _nextFreeIdx[_activeQueue];
     _nextFreeIdx[_activeQueue]++;

     _level[_activeQueue][idx] = level;
     _length[_activeQueue][idx] = length;
     memcpy(_messageQueue[_activeQueue][idx], traceMessage, length);

     if(_nextFreeIdx[_activeQueue] == WEBRTC_TRACE_MAX_QUEUE-1)
     {
         // Logging more messages than can be worked off. Log a warning.
         const char warning_msg[] = "WARNING MISSING TRACE MESSAGES\n";
         _level[_activeQueue][_nextFreeIdx[_activeQueue]] = kTraceWarning;
         _length[_activeQueue][_nextFreeIdx[_activeQueue]] = strlen(warning_msg);
         memcpy(_messageQueue[_activeQueue][_nextFreeIdx[_activeQueue]],
                warning_msg, _length[_activeQueue][idx]);
         _nextFreeIdx[_activeQueue]++;
     }
 }

 bool TraceImpl::Run(void* obj)
 {
     return static_cast<TraceImpl*>(obj)->Process();
 }

 bool TraceImpl::Process()
 {
     if(_event.Wait(1000) == kEventSignaled)
     {
         if(_traceFile.Open() || _callback)
         {
             // File mode (not calback mode).
             WriteToFile();
         }
     } else {
         _traceFile.Flush();
     }
     return true;
 }

 void TraceImpl::WriteToFile()
 {
     WebRtc_UWord8 localQueueActive = 0;
     WebRtc_UWord16 localNextFreeIdx = 0;

     // There are two buffer. One for reading (for writing to file) and one for
     // writing (for storing new messages). Let new messages be posted to the
     // unused buffer so that the current buffer can be flushed safely.
     {
         CriticalSectionScoped lock(_critsectArray);
         localNextFreeIdx = _nextFreeIdx[_activeQueue];
         _nextFreeIdx[_activeQueue] = 0;
         localQueueActive = _activeQueue;
         if(_activeQueue == 0)
         {
             _activeQueue = 1;
         } else
         {
             _activeQueue = 0;
         }
     }
     if(localNextFreeIdx == 0)
     {
         return;
     }

     CriticalSectionScoped lock(_critsectInterface);

     for(WebRtc_UWord16 idx = 0; idx <localNextFreeIdx; idx++)
     {
         TraceLevel localLevel = _level[localQueueActive][idx];
         if(_callback)
         {
             _callback->Print(localLevel, _messageQueue[localQueueActive][idx],
                              _length[localQueueActive][idx]);
         }
         if(_traceFile.Open())
         {
             if(_rowCountText > WEBRTC_TRACE_MAX_FILE_SIZE)
             {
                 // wrap file
                 _rowCountText = 0;
                 _traceFile.Flush();

                 if(_fileCountText == 0)
                 {
                     _traceFile.Rewind();
                 } else
                 {
                     char oldFileName[FileWrapper::kMaxFileNameSize];
                     char newFileName[FileWrapper::kMaxFileNameSize];

                     // get current name
                     _traceFile.FileName(oldFileName,
                                         FileWrapper::kMaxFileNameSize);
                     _traceFile.CloseFile();

                     _fileCountText++;

                     UpdateFileName(oldFileName, newFileName, _fileCountText);

                     if(_traceFile.OpenFile(newFileName, false, false,
                                            true) == -1)
                     {
                         return;
                     }
                 }
             }
             if(_rowCountText ==  0)
             {
                 char message[WEBRTC_TRACE_MAX_MESSAGE_SIZE + 1];
                 WebRtc_Word32 length = AddDateTimeInfo(message);
                 if(length != -1)
                 {
                     message[length] = 0;
                     message[length-1] = '\n';
                     _traceFile.Write(message, length);
                     _rowCountText++;
                 }
                 length = AddBuildInfo(message);
                 if(length != -1)
                 {
                     message[length+1] = 0;
                     message[length] = '\n';
                     message[length-1] = '\n';
                     _traceFile.Write(message, length+1);
                     _rowCountText++;
                     _rowCountText++;
                 }
             }
             WebRtc_UWord16 length = _length[localQueueActive][idx];
             _messageQueue[localQueueActive][idx][length] = 0;
             _messageQueue[localQueueActive][idx][length-1] = '\n';
             _traceFile.Write(_messageQueue[localQueueActive][idx], length);
             _rowCountText++;
         }
     }
 }

 void TraceImpl::AddImpl(const TraceLevel level, const TraceModule module,
                         const WebRtc_Word32 id,
                         const char msg[WEBRTC_TRACE_MAX_MESSAGE_SIZE])
 {
     if (TraceCheck(level))
     {
         char traceMessage[WEBRTC_TRACE_MAX_MESSAGE_SIZE];
         char* meassagePtr = traceMessage;

         WebRtc_Word32 len = 0;
         WebRtc_Word32 ackLen = 0;

         len = AddLevel(meassagePtr, level);
         if(len == -1)
         {
             return;
         }
         meassagePtr += len;
         ackLen += len;

         len = AddTime(meassagePtr, level);
         if(len == -1)
         {
             return;
         }
         meassagePtr += len;
         ackLen += len;

         len = AddModuleAndId(meassagePtr, module, id);
         if(len == -1)
         {
             return;
         }
         meassagePtr += len;
         ackLen += len;

         len = AddThreadId(meassagePtr);
         if(len < 0)
         {
             return;
         }
         meassagePtr += len;
         ackLen += len;

         len = AddMessage(meassagePtr, msg, (WebRtc_UWord16)ackLen);
         if(len == -1)
         {
             return;
         }
         ackLen += len;
         AddMessageToList(traceMessage,(WebRtc_UWord16)ackLen, level);

         // Make sure that messages are written as soon as possible.
         _event.Set();
     }
 }

 bool TraceImpl::TraceCheck(const TraceLevel level) const
 {
     return (level & levelFilter)? true:false;
 }

 bool TraceImpl::UpdateFileName(
     const char fileNameUTF8[FileWrapper::kMaxFileNameSize],
     char fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize],
     const WebRtc_UWord32 newCount) const
 {
     WebRtc_Word32 length = (WebRtc_Word32)strlen(fileNameUTF8);
     if(length < 0)
     {
         return false;
     }

     WebRtc_Word32 lengthWithoutFileEnding = length-1;
     while(lengthWithoutFileEnding > 0)
     {
         if(fileNameUTF8[lengthWithoutFileEnding] == '.')
         {
             break;
         } else {
             lengthWithoutFileEnding--;
         }
     }
     if(lengthWithoutFileEnding == 0)
     {
         lengthWithoutFileEnding = length;
     }
     WebRtc_Word32 lengthTo_ = lengthWithoutFileEnding - 1;
     while(lengthTo_ > 0)
     {
         if(fileNameUTF8[lengthTo_] == '_')
         {
             break;
         } else {
             lengthTo_--;
         }
     }

     memcpy(fileNameWithCounterUTF8, fileNameUTF8, lengthTo_);
     sprintf(fileNameWithCounterUTF8+lengthTo_, "_%lu%s",
             static_cast<long unsigned int> (newCount),
             fileNameUTF8+lengthWithoutFileEnding);
     return true;
 }

 bool TraceImpl::CreateFileName(
     const char fileNameUTF8[FileWrapper::kMaxFileNameSize],
     char fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize],
     const WebRtc_UWord32 newCount) const
 {
     WebRtc_Word32 length = (WebRtc_Word32)strlen(fileNameUTF8);
     if(length < 0)
     {
         return false;
     }

     WebRtc_Word32 lengthWithoutFileEnding = length-1;
     while(lengthWithoutFileEnding > 0)
     {
         if(fileNameUTF8[lengthWithoutFileEnding] == '.')
         {
             break;
         }else
         {
             lengthWithoutFileEnding--;
         }
     }
     if(lengthWithoutFileEnding == 0)
     {
         lengthWithoutFileEnding = length;
     }
     memcpy(fileNameWithCounterUTF8, fileNameUTF8, lengthWithoutFileEnding);
     sprintf(fileNameWithCounterUTF8+lengthWithoutFileEnding, "_%lu%s",
             static_cast<long unsigned int> (newCount),
             fileNameUTF8+lengthWithoutFileEnding);
     return true;
 }

 void Trace::CreateTrace()
 {
     TraceImpl::StaticInstance(kAddRef);
 }

 void Trace::ReturnTrace()
 {
     TraceImpl::StaticInstance(kRelease);
 }

 WebRtc_Word32 Trace::SetLevelFilter(WebRtc_UWord32 filter)
 {
     levelFilter = filter;
     return 0;
 }

 WebRtc_Word32 Trace::LevelFilter(WebRtc_UWord32& filter)
 {
     filter = levelFilter;
     return 0;
 }

 WebRtc_Word32 Trace::TraceFile(char fileName[FileWrapper::kMaxFileNameSize])
 {
     TraceImpl* trace = TraceImpl::GetTrace();
     if(trace)
     {
         int retVal = trace->TraceFileImpl(fileName);
         ReturnTrace();
         return retVal;
     }
     return -1;
 }

 WebRtc_Word32 Trace::SetTraceFile(const char* fileName,
                                   const bool addFileCounter)
 {
     TraceImpl* trace = TraceImpl::GetTrace();
     if(trace)
     {
         int retVal = trace->SetTraceFileImpl(fileName, addFileCounter);
         ReturnTrace();
         return retVal;
     }
     return -1;
 }

 WebRtc_Word32 Trace::SetTraceCallback(TraceCallback* callback)
 {
     TraceImpl* trace = TraceImpl::GetTrace();
     if(trace)
     {
         int retVal = trace->SetTraceCallbackImpl(callback);
         ReturnTrace();
         return retVal;
     }
     return -1;
 }

 void Trace::Add(const TraceLevel level, const TraceModule module,
                 const WebRtc_Word32 id, const char* msg, ...)

 {
     TraceImpl* trace = TraceImpl::GetTrace(level);
     if(trace)
     {
         if(trace->TraceCheck(level))
         {
             char tempBuff[WEBRTC_TRACE_MAX_MESSAGE_SIZE];
             char* buff = 0;
             if(msg)
             {
                 va_list args;
                 va_start(args, msg);
 #ifdef _WIN32
                 _vsnprintf(tempBuff,WEBRTC_TRACE_MAX_MESSAGE_SIZE-1,msg,args);
 #else
                 vsnprintf(tempBuff,WEBRTC_TRACE_MAX_MESSAGE_SIZE-1,msg,args);
 #endif
                 va_end(args);
                 buff = tempBuff;
             }
             trace->AddImpl(level, module, id, buff);
         }
         ReturnTrace();
     }
 }

 } // namespace webrtc
	/*
	* 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.
	*/

	#include "trace_impl.h"

	#include <cassert>
	#include <string.h> // memset

	#ifdef _WIN32
	#include "trace_win.h"
	#else
	#include <stdio.h>
	#include <time.h>
	#include <stdarg.h>
	#include "trace_posix.h"
	#endif // _WIN32

	#define KEY_LEN_CHARS 31

	#ifdef _WIN32
	#pragma warning(disable:4355)
	// VS 2005: Disable warnings for default initialized arrays.
	#pragma warning(disable:4351)
	#endif // _WIN32

	namespace webrtc {
	static WebRtc_UWord32 levelFilter = kTraceDefault;

	// Construct On First Use idiom. Avoids "static initialization order fiasco".
	TraceImpl* TraceImpl::StaticInstance(CountOperation count_operation,
	const TraceLevel level)
	{
	// Sanities to avoid taking lock unless absolutely necessary (for
	// performance reasons).
	// count_operation == kAddRefNoCreate implies that a message will be
	// written to file.
	if((level != kTraceAll) && (count_operation == kAddRefNoCreate))
	{
	if(!(level & levelFilter))
	{
	return NULL;
	}
	}
	TraceImpl* impl =
	GetStaticInstance<TraceImpl>(count_operation);
	return impl;
	}

	TraceImpl* TraceImpl::GetTrace(const TraceLevel level)
	{
	return StaticInstance(kAddRefNoCreate, level);
	}

	TraceImpl* TraceImpl::CreateInstance()
	{
	#if defined(_WIN32)
	return new TraceWindows();
	#else
	return new TracePosix();
	#endif
	}

	TraceImpl::TraceImpl()
	: _critsectInterface(CriticalSectionWrapper::CreateCriticalSection()),
	_callback(NULL),
	_rowCountText(0),
	_fileCountText(0),
	_traceFile(*FileWrapper::Create()),
	_thread(*ThreadWrapper::CreateThread(TraceImpl::Run, this,
	kHighestPriority, "Trace")),
	_event(*EventWrapper::Create()),
	_critsectArray(CriticalSectionWrapper::CreateCriticalSection()),
	_nextFreeIdx(),
	_level(),
	_length(),
	_messageQueue(),
	_activeQueue(0)
	{
	_nextFreeIdx[0] = 0;
	_nextFreeIdx[1] = 0;

	unsigned int tid = 0;
	_thread.Start(tid);

	for(int m = 0; m < WEBRTC_TRACE_NUM_ARRAY; m++)
	{
	for(int n = 0; n < WEBRTC_TRACE_MAX_QUEUE; n++)
	{
	_messageQueue[m][n] = new
	char[WEBRTC_TRACE_MAX_MESSAGE_SIZE];
	}
	}
	}

	bool TraceImpl::StopThread()
	{
	// Release the worker thread so that it can flush any lingering messages.
	_event.Set();

	// Allow 10 ms for pending messages to be flushed out.
	// TODO (hellner): why not use condition variables to do this? Or let the
	// worker thread die and let this thread flush remaining
	// messages?
	#ifdef _WIN32
	Sleep(10);
	#else
	timespec t;
	t.tv_sec = 0;
	t.tv_nsec = 10*1000000;
	nanosleep(&t,NULL);
	#endif

	_thread.SetNotAlive();
	// Make sure the thread finishes as quickly as possible (instead of having
	// to wait for the timeout).
	_event.Set();
	bool stopped = _thread.Stop();

	CriticalSectionScoped lock(_critsectInterface);
	_traceFile.Flush();
	_traceFile.CloseFile();
	return stopped;
	}

	TraceImpl::~TraceImpl()
	{
	StopThread();
	delete &_event;
	delete &_traceFile;
	delete &_thread;
	delete _critsectInterface;
	delete _critsectArray;

	for(int m = 0; m < WEBRTC_TRACE_NUM_ARRAY; m++)
	{
	for(int n = 0; n < WEBRTC_TRACE_MAX_QUEUE; n++)
	{
	delete [] _messageQueue[m][n];
	}
	}
	}

	WebRtc_Word32 TraceImpl::AddThreadId(char* traceMessage) const {
	WebRtc_UWord32 threadId = ThreadWrapper::GetThreadId();
	// Messages is 12 characters.
	return sprintf(traceMessage, "%10u; ", threadId);
	}

	WebRtc_Word32 TraceImpl::AddLevel(char* szMessage, const TraceLevel level) const
	{
	switch (level)
	{
	case kTraceStateInfo:
	sprintf (szMessage, "STATEINFO ; ");
	break;
	case kTraceWarning:
	sprintf (szMessage, "WARNING ; ");
	break;
	case kTraceError:
	sprintf (szMessage, "ERROR ; ");
	break;
	case kTraceCritical:
	sprintf (szMessage, "CRITICAL ; ");
	break;
	case kTraceInfo:
	sprintf (szMessage, "DEBUGINFO ; ");
	break;
	case kTraceModuleCall:
	sprintf (szMessage, "MODULECALL; ");
	break;
	case kTraceMemory:
	sprintf (szMessage, "MEMORY ; ");
	break;
	case kTraceTimer:
	sprintf (szMessage, "TIMER ; ");
	break;
	case kTraceStream:
	sprintf (szMessage, "STREAM ; ");
	break;
	case kTraceApiCall:
	sprintf (szMessage, "APICALL ; ");
	break;
	case kTraceDebug:
	sprintf (szMessage, "DEBUG ; ");
	break;
	default:
	assert(false);
	return 0;
	}
	// All messages are 12 characters.
	return 12;
	}

	WebRtc_Word32 TraceImpl::AddModuleAndId(char* traceMessage,
	const TraceModule module,
	const WebRtc_Word32 id) const
	{
	// Use long int to prevent problems with different definitions of
	// WebRtc_Word32.
	// TODO (hellner): is this actually a problem? If so, it should be better to
	// clean up WebRtc_Word32
	const long int idl = id;
	if(idl != -1)
	{
	const unsigned long int idEngine = id>>16;
	const unsigned long int idChannel = id & 0xffff;

	switch (module)
	{
	case kTraceVoice:
	sprintf(traceMessage, " VOICE:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceVideo:
	sprintf(traceMessage, " VIDEO:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceUtility:
	sprintf(traceMessage, " UTILITY:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceRtpRtcp:
	sprintf(traceMessage, " RTP/RTCP:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceTransport:
	sprintf(traceMessage, " TRANSPORT:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceAudioCoding:
	sprintf(traceMessage, "AUDIO CODING:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceSrtp:
	sprintf(traceMessage, " SRTP:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceAudioMixerServer:
	sprintf(traceMessage, " AUDIO MIX/S:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceAudioMixerClient:
	sprintf(traceMessage, " AUDIO MIX/C:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceVideoCoding:
	sprintf(traceMessage, "VIDEO CODING:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceVideoMixer:
	// Print sleep time and API call
	sprintf(traceMessage, " VIDEO MIX:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceFile:
	sprintf(traceMessage, " FILE:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceAudioProcessing:
	sprintf(traceMessage, " AUDIO PROC:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceAudioDevice:
	sprintf(traceMessage, "AUDIO DEVICE:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceVideoRenderer:
	sprintf(traceMessage, "VIDEO RENDER:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceVideoCapture:
	sprintf(traceMessage, "VIDEO CAPTUR:%5ld %5ld;", idEngine,
	idChannel);
	break;
	case kTraceVideoPreocessing:
	sprintf(traceMessage, " VIDEO PROC:%5ld %5ld;", idEngine,
	idChannel);
	break;
	}
	} else {
	switch (module)
	{
	case kTraceVoice:
	sprintf (traceMessage, " VOICE:%11ld;", idl);
	break;
	case kTraceVideo:
	sprintf (traceMessage, " VIDEO:%11ld;", idl);
	break;
	case kTraceUtility:
	sprintf (traceMessage, " UTILITY:%11ld;", idl);
	break;
	case kTraceRtpRtcp:
	sprintf (traceMessage, " RTP/RTCP:%11ld;", idl);
	break;
	case kTraceTransport:
	sprintf (traceMessage, " TRANSPORT:%11ld;", idl);
	break;
	case kTraceAudioCoding:
	sprintf (traceMessage, "AUDIO CODING:%11ld;", idl);
	break;
	case kTraceSrtp:
	sprintf (traceMessage, " SRTP:%11ld;", idl);
	break;
	case kTraceAudioMixerServer:
	sprintf (traceMessage, " AUDIO MIX/S:%11ld;", idl);
	break;
	case kTraceAudioMixerClient:
	sprintf (traceMessage, " AUDIO MIX/C:%11ld;", idl);
	break;
	case kTraceVideoCoding:
	sprintf (traceMessage, "VIDEO CODING:%11ld;", idl);
	break;
	case kTraceVideoMixer:
	sprintf (traceMessage, " VIDEO MIX:%11ld;", idl);
	break;
	case kTraceFile:
	sprintf (traceMessage, " FILE:%11ld;", idl);
	break;
	case kTraceAudioProcessing:
	sprintf (traceMessage, " AUDIO PROC:%11ld;", idl);
	break;
	case kTraceAudioDevice:
	sprintf (traceMessage, "AUDIO DEVICE:%11ld;", idl);
	break;
	case kTraceVideoRenderer:
	sprintf (traceMessage, "VIDEO RENDER:%11ld;", idl);
	break;
	case kTraceVideoCapture:
	sprintf (traceMessage, "VIDEO CAPTUR:%11ld;", idl);
	break;
	case kTraceVideoPreocessing:
	sprintf (traceMessage, " VIDEO PROC:%11ld;", idl);
	break;
	}
	}
	// All messages are 25 characters.
	return 25;
	}

	WebRtc_Word32 TraceImpl::SetTraceFileImpl(const char* fileNameUTF8,
	const bool addFileCounter)
	{
	CriticalSectionScoped lock(_critsectInterface);

	_traceFile.Flush();
	_traceFile.CloseFile();

	if(fileNameUTF8)
	{
	if(addFileCounter)
	{
	_fileCountText = 1;

	char fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize];
	CreateFileName(fileNameUTF8, fileNameWithCounterUTF8,
	_fileCountText);
	if(_traceFile.OpenFile(fileNameWithCounterUTF8, false, false,
	true) == -1)
	{
	return -1;
	}
	}else {
	_fileCountText = 0;
	if(_traceFile.OpenFile(fileNameUTF8, false, false, true) == -1)
	{
	return -1;
	}
	}
	}
	_rowCountText = 0;
	return 0;
	}

	WebRtc_Word32 TraceImpl::TraceFileImpl(
	char fileNameUTF8[FileWrapper::kMaxFileNameSize])
	{
	CriticalSectionScoped lock(_critsectInterface);
	return _traceFile.FileName(fileNameUTF8, FileWrapper::kMaxFileNameSize);
	}

	WebRtc_Word32 TraceImpl::SetTraceCallbackImpl(TraceCallback* callback)
	{
	CriticalSectionScoped lock(_critsectInterface);
	_callback = callback;
	return 0;
	}

	WebRtc_Word32 TraceImpl::AddMessage(
	char* traceMessage,
	const char msg[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
	const WebRtc_UWord16 writtenSoFar) const

	{
	int length = 0;
	if(writtenSoFar >= WEBRTC_TRACE_MAX_MESSAGE_SIZE)
	{
	return -1;
	}
	// - 2 to leave room for newline and NULL termination
	#ifdef _WIN32
	length = _snprintf(traceMessage,
	WEBRTC_TRACE_MAX_MESSAGE_SIZE - writtenSoFar - 2,
	"%s",msg);
	if(length < 0)
	{
	length = WEBRTC_TRACE_MAX_MESSAGE_SIZE - writtenSoFar - 2;
	traceMessage[length] = 0;
	}
	#else
	length = snprintf(traceMessage,
	WEBRTC_TRACE_MAX_MESSAGE_SIZE-writtenSoFar-2, "%s",msg);
	if(length < 0 \|\| length > WEBRTC_TRACE_MAX_MESSAGE_SIZE-writtenSoFar - 2)
	{
	length = WEBRTC_TRACE_MAX_MESSAGE_SIZE - writtenSoFar - 2;
	traceMessage[length] = 0;
	}
	#endif
	// Length with NULL termination.
	return length+1;
	}

	void TraceImpl::AddMessageToList(
	const char traceMessage[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
	const WebRtc_UWord16 length,
	const TraceLevel level)
	{
	CriticalSectionScoped lock(_critsectArray);

	if(_nextFreeIdx[_activeQueue] >= WEBRTC_TRACE_MAX_QUEUE)
	{
	if( ! _traceFile.Open() &&
	!_callback)
	{
	// Keep at least the last 1/4 of old messages when not logging.
	// TODO (hellner): isn't this redundant. The user will make it known
	// when to start logging. Why keep messages before
	// that?
	for(int n = 0; n < WEBRTC_TRACE_MAX_QUEUE/4; n++)
	{
	const int lastQuarterOffset = (3*WEBRTC_TRACE_MAX_QUEUE/4);
	memcpy(_messageQueue[_activeQueue][n],
	_messageQueue[_activeQueue][n + lastQuarterOffset],
	WEBRTC_TRACE_MAX_MESSAGE_SIZE);
	}
	_nextFreeIdx[_activeQueue] = WEBRTC_TRACE_MAX_QUEUE/4;
	} else {
	// More messages are being written than there is room for in the
	// buffer. Drop any new messages.
	// TODO (hellner): its probably better to drop old messages instead
	// of new ones. One step further: if this happens
	// it's due to writing faster than what can be
	// processed. Maybe modify the filter at this point.
	// E.g. turn of STREAM.
	return;
	}
	}

	WebRtc_UWord16 idx = _nextFreeIdx[_activeQueue];
	_nextFreeIdx[_activeQueue]++;

	_level[_activeQueue][idx] = level;
	_length[_activeQueue][idx] = length;
	memcpy(_messageQueue[_activeQueue][idx], traceMessage, length);

	if(_nextFreeIdx[_activeQueue] == WEBRTC_TRACE_MAX_QUEUE-1)
	{
	// Logging more messages than can be worked off. Log a warning.
	const char warning_msg[] = "WARNING MISSING TRACE MESSAGES\n";
	_level[_activeQueue][_nextFreeIdx[_activeQueue]] = kTraceWarning;
	_length[_activeQueue][_nextFreeIdx[_activeQueue]] = strlen(warning_msg);
	memcpy(_messageQueue[_activeQueue][_nextFreeIdx[_activeQueue]],
	warning_msg, _length[_activeQueue][idx]);
	_nextFreeIdx[_activeQueue]++;
	}
	}

	bool TraceImpl::Run(void* obj)
	{
	return static_cast<TraceImpl*>(obj)->Process();
	}

	bool TraceImpl::Process()
	{
	if(_event.Wait(1000) == kEventSignaled)
	{
	if(_traceFile.Open() \|\| _callback)
	{
	// File mode (not calback mode).
	WriteToFile();
	}
	} else {
	_traceFile.Flush();
	}
	return true;
	}

	void TraceImpl::WriteToFile()
	{
	WebRtc_UWord8 localQueueActive = 0;
	WebRtc_UWord16 localNextFreeIdx = 0;

	// There are two buffer. One for reading (for writing to file) and one for
	// writing (for storing new messages). Let new messages be posted to the
	// unused buffer so that the current buffer can be flushed safely.
	{
	CriticalSectionScoped lock(_critsectArray);
	localNextFreeIdx = _nextFreeIdx[_activeQueue];
	_nextFreeIdx[_activeQueue] = 0;
	localQueueActive = _activeQueue;
	if(_activeQueue == 0)
	{
	_activeQueue = 1;
	} else
	{
	_activeQueue = 0;
	}
	}
	if(localNextFreeIdx == 0)
	{
	return;
	}

	CriticalSectionScoped lock(_critsectInterface);

	for(WebRtc_UWord16 idx = 0; idx <localNextFreeIdx; idx++)
	{
	TraceLevel localLevel = _level[localQueueActive][idx];
	if(_callback)
	{
	_callback->Print(localLevel, _messageQueue[localQueueActive][idx],
	_length[localQueueActive][idx]);
	}
	if(_traceFile.Open())
	{
	if(_rowCountText > WEBRTC_TRACE_MAX_FILE_SIZE)
	{
	// wrap file
	_rowCountText = 0;
	_traceFile.Flush();

	if(_fileCountText == 0)
	{
	_traceFile.Rewind();
	} else
	{
	char oldFileName[FileWrapper::kMaxFileNameSize];
	char newFileName[FileWrapper::kMaxFileNameSize];

	// get current name
	_traceFile.FileName(oldFileName,
	FileWrapper::kMaxFileNameSize);
	_traceFile.CloseFile();

	_fileCountText++;

	UpdateFileName(oldFileName, newFileName, _fileCountText);

	if(_traceFile.OpenFile(newFileName, false, false,
	true) == -1)
	{
	return;
	}
	}
	}
	if(_rowCountText == 0)
	{
	char message[WEBRTC_TRACE_MAX_MESSAGE_SIZE + 1];
	WebRtc_Word32 length = AddDateTimeInfo(message);
	if(length != -1)
	{
	message[length] = 0;
	message[length-1] = '\n';
	_traceFile.Write(message, length);
	_rowCountText++;
	}
	length = AddBuildInfo(message);
	if(length != -1)
	{
	message[length+1] = 0;
	message[length] = '\n';
	message[length-1] = '\n';
	_traceFile.Write(message, length+1);
	_rowCountText++;
	_rowCountText++;
	}
	}
	WebRtc_UWord16 length = _length[localQueueActive][idx];
	_messageQueue[localQueueActive][idx][length] = 0;
	_messageQueue[localQueueActive][idx][length-1] = '\n';
	_traceFile.Write(_messageQueue[localQueueActive][idx], length);
	_rowCountText++;
	}
	}
	}

	void TraceImpl::AddImpl(const TraceLevel level, const TraceModule module,
	const WebRtc_Word32 id,
	const char msg[WEBRTC_TRACE_MAX_MESSAGE_SIZE])
	{
	if (TraceCheck(level))
	{
	char traceMessage[WEBRTC_TRACE_MAX_MESSAGE_SIZE];
	char* meassagePtr = traceMessage;

	WebRtc_Word32 len = 0;
	WebRtc_Word32 ackLen = 0;

	len = AddLevel(meassagePtr, level);
	if(len == -1)
	{
	return;
	}
	meassagePtr += len;
	ackLen += len;

	len = AddTime(meassagePtr, level);
	if(len == -1)
	{
	return;
	}
	meassagePtr += len;
	ackLen += len;

	len = AddModuleAndId(meassagePtr, module, id);
	if(len == -1)
	{
	return;
	}
	meassagePtr += len;
	ackLen += len;

	len = AddThreadId(meassagePtr);
	if(len < 0)
	{
	return;
	}
	meassagePtr += len;
	ackLen += len;

	len = AddMessage(meassagePtr, msg, (WebRtc_UWord16)ackLen);
	if(len == -1)
	{
	return;
	}
	ackLen += len;
	AddMessageToList(traceMessage,(WebRtc_UWord16)ackLen, level);

	// Make sure that messages are written as soon as possible.
	_event.Set();
	}
	}

	bool TraceImpl::TraceCheck(const TraceLevel level) const
	{
	return (level & levelFilter)? true:false;
	}

	bool TraceImpl::UpdateFileName(
	const char fileNameUTF8[FileWrapper::kMaxFileNameSize],
	char fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize],
	const WebRtc_UWord32 newCount) const
	{
	WebRtc_Word32 length = (WebRtc_Word32)strlen(fileNameUTF8);
	if(length < 0)
	{
	return false;
	}

	WebRtc_Word32 lengthWithoutFileEnding = length-1;
	while(lengthWithoutFileEnding > 0)
	{
	if(fileNameUTF8[lengthWithoutFileEnding] == '.')
	{
	break;
	} else {
	lengthWithoutFileEnding--;
	}
	}
	if(lengthWithoutFileEnding == 0)
	{
	lengthWithoutFileEnding = length;
	}
	WebRtc_Word32 lengthTo_ = lengthWithoutFileEnding - 1;
	while(lengthTo_ > 0)
	{
	if(fileNameUTF8[lengthTo_] == '_')
	{
	break;
	} else {
	lengthTo_--;
	}
	}

	memcpy(fileNameWithCounterUTF8, fileNameUTF8, lengthTo_);
	sprintf(fileNameWithCounterUTF8+lengthTo_, "_%lu%s",
	static_cast<long unsigned int> (newCount),
	fileNameUTF8+lengthWithoutFileEnding);
	return true;
	}

	bool TraceImpl::CreateFileName(
	const char fileNameUTF8[FileWrapper::kMaxFileNameSize],
	char fileNameWithCounterUTF8[FileWrapper::kMaxFileNameSize],
	const WebRtc_UWord32 newCount) const
	{
	WebRtc_Word32 length = (WebRtc_Word32)strlen(fileNameUTF8);
	if(length < 0)
	{
	return false;
	}

	WebRtc_Word32 lengthWithoutFileEnding = length-1;
	while(lengthWithoutFileEnding > 0)
	{
	if(fileNameUTF8[lengthWithoutFileEnding] == '.')
	{
	break;
	}else
	{
	lengthWithoutFileEnding--;
	}
	}
	if(lengthWithoutFileEnding == 0)
	{
	lengthWithoutFileEnding = length;
	}
	memcpy(fileNameWithCounterUTF8, fileNameUTF8, lengthWithoutFileEnding);
	sprintf(fileNameWithCounterUTF8+lengthWithoutFileEnding, "_%lu%s",
	static_cast<long unsigned int> (newCount),
	fileNameUTF8+lengthWithoutFileEnding);
	return true;
	}

	void Trace::CreateTrace()
	{
	TraceImpl::StaticInstance(kAddRef);
	}

	void Trace::ReturnTrace()
	{
	TraceImpl::StaticInstance(kRelease);
	}

	WebRtc_Word32 Trace::SetLevelFilter(WebRtc_UWord32 filter)
	{
	levelFilter = filter;
	return 0;
	}

	WebRtc_Word32 Trace::LevelFilter(WebRtc_UWord32& filter)
	{
	filter = levelFilter;
	return 0;
	}

	WebRtc_Word32 Trace::TraceFile(char fileName[FileWrapper::kMaxFileNameSize])
	{
	TraceImpl* trace = TraceImpl::GetTrace();
	if(trace)
	{
	int retVal = trace->TraceFileImpl(fileName);
	ReturnTrace();
	return retVal;
	}
	return -1;
	}

	WebRtc_Word32 Trace::SetTraceFile(const char* fileName,
	const bool addFileCounter)
	{
	TraceImpl* trace = TraceImpl::GetTrace();
	if(trace)
	{
	int retVal = trace->SetTraceFileImpl(fileName, addFileCounter);
	ReturnTrace();
	return retVal;
	}
	return -1;
	}

	WebRtc_Word32 Trace::SetTraceCallback(TraceCallback* callback)
	{
	TraceImpl* trace = TraceImpl::GetTrace();
	if(trace)
	{
	int retVal = trace->SetTraceCallbackImpl(callback);
	ReturnTrace();
	return retVal;
	}
	return -1;
	}

	void Trace::Add(const TraceLevel level, const TraceModule module,
	const WebRtc_Word32 id, const char* msg, ...)

	{
	TraceImpl* trace = TraceImpl::GetTrace(level);
	if(trace)
	{
	if(trace->TraceCheck(level))
	{
	char tempBuff[WEBRTC_TRACE_MAX_MESSAGE_SIZE];
	char* buff = 0;
	if(msg)
	{
	va_list args;
	va_start(args, msg);
	#ifdef _WIN32
	_vsnprintf(tempBuff,WEBRTC_TRACE_MAX_MESSAGE_SIZE-1,msg,args);
	#else
	vsnprintf(tempBuff,WEBRTC_TRACE_MAX_MESSAGE_SIZE-1,msg,args);
	#endif
	va_end(args);
	buff = tempBuff;
	}
	trace->AddImpl(level, module, id, buff);
	}
	ReturnTrace();
	}
	}

	} // namespace webrtc