update rtaudio to latest version

update rtaudio from latest version availbale on github

drivers/rtaudio/RtAudio.cpp

@@ -46,6 +46,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <climits>
+#include <algorithm>
 
 // Static variable definitions.
 const unsigned int RtApi::MAX_SAMPLE_RATES = 14;
@@ -63,6 +64,22 @@ const unsigned int RtApi::SAMPLE_RATES[] = {
   #define MUTEX_DESTROY(A)    DeleteCriticalSection(A)
   #define MUTEX_LOCK(A)       EnterCriticalSection(A)
   #define MUTEX_UNLOCK(A)     LeaveCriticalSection(A)
+
+  #include "tchar.h"
+
+  static std::string convertCharPointerToStdString(const char *text)
+  {
+    return std::string(text);
+  }
+
+  static std::string convertCharPointerToStdString(const wchar_t *text)
+  {
+    int length = WideCharToMultiByte(CP_UTF8, 0, text, -1, NULL, 0, NULL, NULL);
+    std::string s( length-1, '\0' );
+    WideCharToMultiByte(CP_UTF8, 0, text, -1, &s[0], length, NULL, NULL);
+    return s;
+  }
+
 #elif defined(__LINUX_ALSA__) || defined(__LINUX_PULSE__) || defined(__UNIX_JACK__) || defined(__LINUX_OSS__) || defined(__MACOSX_CORE__)
   // pthread API
   #define MUTEX_INITIALIZE(A) pthread_mutex_init(A, NULL)
@@ -184,7 +201,7 @@ RtAudio :: RtAudio( RtAudio::Api api )
   getCompiledApi( apis );
   for ( unsigned int i=0; i<apis.size(); i++ ) {
     openRtApi( apis[i] );
-    if ( rtapi_->getDeviceCount() ) break;
+    if ( rtapi_ && rtapi_->getDeviceCount() ) break;
   }
 
   if ( rtapi_ ) return;
@@ -766,9 +783,14 @@ RtAudio::DeviceInfo RtApiCore :: getDeviceInfo( unsigned int device )
   bool haveValueRange = false;
   info.sampleRates.clear();
   for ( UInt32 i=0; i<nRanges; i++ ) {
-    if ( rangeList[i].mMinimum == rangeList[i].mMaximum )
+    if ( rangeList[i].mMinimum == rangeList[i].mMaximum ) {
-      info.sampleRates.push_back( (unsigned int) rangeList[i].mMinimum );
+      unsigned int tmpSr = (unsigned int) rangeList[i].mMinimum;
-    else {
+      info.sampleRates.push_back( tmpSr );
+
+      if ( !info.preferredSampleRate || ( tmpSr <= 48000 && tmpSr > info.preferredSampleRate ) )
+        info.preferredSampleRate = tmpSr;
+
+    } else {
       haveValueRange = true;
       if ( rangeList[i].mMinimum > minimumRate ) minimumRate = rangeList[i].mMinimum;
       if ( rangeList[i].mMaximum < maximumRate ) maximumRate = rangeList[i].mMaximum;
@@ -777,8 +799,12 @@ RtAudio::DeviceInfo RtApiCore :: getDeviceInfo( unsigned int device )
 
   if ( haveValueRange ) {
     for ( unsigned int k=0; k<MAX_SAMPLE_RATES; k++ ) {
-      if ( SAMPLE_RATES[k] >= (unsigned int) minimumRate && SAMPLE_RATES[k] <= (unsigned int) maximumRate )
+      if ( SAMPLE_RATES[k] >= (unsigned int) minimumRate && SAMPLE_RATES[k] <= (unsigned int) maximumRate ) {
         info.sampleRates.push_back( SAMPLE_RATES[k] );
+
+        if ( !info.preferredSampleRate || ( SAMPLE_RATES[k] <= 48000 && SAMPLE_RATES[k] > info.preferredSampleRate ) )
+          info.preferredSampleRate = SAMPLE_RATES[k];
+      }
     }
   }
 
@@ -1385,6 +1411,18 @@ void RtApiCore :: closeStream( void )
 
   CoreHandle *handle = (CoreHandle *) stream_.apiHandle;
   if ( stream_.mode == OUTPUT || stream_.mode == DUPLEX ) {
+    if (handle) {
+      AudioObjectPropertyAddress property = { kAudioHardwarePropertyDevices,
+        kAudioObjectPropertyScopeGlobal,
+        kAudioObjectPropertyElementMaster };
+
+      property.mSelector = kAudioDeviceProcessorOverload;
+      property.mScope = kAudioObjectPropertyScopeGlobal;
+      if (AudioObjectRemovePropertyListener( handle->id[0], &property, xrunListener, (void *) handle ) != noErr) {
+        errorText_ = "RtApiCore::closeStream(): error removing property listener!";
+        error( RtAudioError::WARNING );
+      }
+    }
     if ( stream_.state == STREAM_RUNNING )
       AudioDeviceStop( handle->id[0], callbackHandler );
 #if defined( MAC_OS_X_VERSION_10_5 ) && ( MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5 )
@@ -1396,6 +1434,18 @@ void RtApiCore :: closeStream( void )
   }
 
   if ( stream_.mode == INPUT || ( stream_.mode == DUPLEX && stream_.device[0] != stream_.device[1] ) ) {
+    if (handle) {
+      AudioObjectPropertyAddress property = { kAudioHardwarePropertyDevices,
+        kAudioObjectPropertyScopeGlobal,
+        kAudioObjectPropertyElementMaster };
+
+      property.mSelector = kAudioDeviceProcessorOverload;
+      property.mScope = kAudioObjectPropertyScopeGlobal;
+      if (AudioObjectRemovePropertyListener( handle->id[1], &property, xrunListener, (void *) handle ) != noErr) {
+        errorText_ = "RtApiCore::closeStream(): error removing property listener!";
+        error( RtAudioError::WARNING );
+      }
+    }
     if ( stream_.state == STREAM_RUNNING )
       AudioDeviceStop( handle->id[1], callbackHandler );
 #if defined( MAC_OS_X_VERSION_10_5 ) && ( MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5 )
@@ -1989,7 +2039,9 @@ RtAudio::DeviceInfo RtApiJack :: getDeviceInfo( unsigned int device )
 
   // Get the current jack server sample rate.
   info.sampleRates.clear();
-  info.sampleRates.push_back( jack_get_sample_rate( client ) );
+
+  info.preferredSampleRate = jack_get_sample_rate( client );
+  info.sampleRates.push_back( info.preferredSampleRate );
 
   // Count the available ports containing the client name as device
   // channels.  Jack "input ports" equal RtAudio output channels.
@@ -2769,8 +2821,12 @@ RtAudio::DeviceInfo RtApiAsio :: getDeviceInfo( unsigned int device )
   info.sampleRates.clear();
   for ( unsigned int i=0; i<MAX_SAMPLE_RATES; i++ ) {
     result = ASIOCanSampleRate( (ASIOSampleRate) SAMPLE_RATES[i] );
-    if ( result == ASE_OK )
+    if ( result == ASE_OK ) {
       info.sampleRates.push_back( SAMPLE_RATES[i] );
+
+      if ( !info.preferredSampleRate || ( SAMPLE_RATES[i] <= 48000 && SAMPLE_RATES[i] > info.preferredSampleRate ) )
+        info.preferredSampleRate = SAMPLE_RATES[i];
+    }
   }
 
   // Determine supported data types ... just check first channel and assume rest are the same.
@@ -2829,9 +2885,12 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
                                    unsigned int firstChannel, unsigned int sampleRate,
                                    RtAudioFormat format, unsigned int *bufferSize,
                                    RtAudio::StreamOptions *options )
-{
+{////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+  bool isDuplexInput =  mode == INPUT && stream_.mode == OUTPUT;
+
   // For ASIO, a duplex stream MUST use the same driver.
-  if ( mode == INPUT && stream_.mode == OUTPUT && stream_.device[0] != device ) {
+  if ( isDuplexInput && stream_.device[0] != device ) {
     errorText_ = "RtApiAsio::probeDeviceOpen: an ASIO duplex stream must use the same device for input and output!";
     return FAILURE;
   }
@@ -2845,7 +2904,7 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   }
 
   // Only load the driver once for duplex stream.
-  if ( mode != INPUT || stream_.mode != OUTPUT ) {
+  if ( !isDuplexInput ) {
     // The getDeviceInfo() function will not work when a stream is open
     // because ASIO does not allow multiple devices to run at the same
     // time.  Thus, we'll probe the system before opening a stream and
@@ -2866,22 +2925,26 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
     }
   }
 
+  // keep them before any "goto error", they are used for error cleanup + goto device boundary checks
+  bool buffersAllocated = false;
+  AsioHandle *handle = (AsioHandle *) stream_.apiHandle;
+  unsigned int nChannels;
+
+
   // Check the device channel count.
   long inputChannels, outputChannels;
   result = ASIOGetChannels( &inputChannels, &outputChannels );
   if ( result != ASE_OK ) {
-    drivers.removeCurrentDriver();
     errorStream_ << "RtApiAsio::probeDeviceOpen: error (" << getAsioErrorString( result ) << ") getting channel count (" << driverName << ").";
     errorText_ = errorStream_.str();
-    return FAILURE;
+    goto error;
   }
 
   if ( ( mode == OUTPUT && (channels+firstChannel) > (unsigned int) outputChannels) ||
        ( mode == INPUT && (channels+firstChannel) > (unsigned int) inputChannels) ) {
-    drivers.removeCurrentDriver();
     errorStream_ << "RtApiAsio::probeDeviceOpen: driver (" << driverName << ") does not support requested channel count (" << channels << ") + offset (" << firstChannel << ").";
     errorText_ = errorStream_.str();
-    return FAILURE;
+    goto error;
   }
   stream_.nDeviceChannels[mode] = channels;
   stream_.nUserChannels[mode] = channels;
@@ -2890,30 +2953,27 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   // Verify the sample rate is supported.
   result = ASIOCanSampleRate( (ASIOSampleRate) sampleRate );
   if ( result != ASE_OK ) {
-    drivers.removeCurrentDriver();
     errorStream_ << "RtApiAsio::probeDeviceOpen: driver (" << driverName << ") does not support requested sample rate (" << sampleRate << ").";
     errorText_ = errorStream_.str();
-    return FAILURE;
+    goto error;
   }
 
   // Get the current sample rate
   ASIOSampleRate currentRate;
   result = ASIOGetSampleRate( &currentRate );
   if ( result != ASE_OK ) {
-    drivers.removeCurrentDriver();
     errorStream_ << "RtApiAsio::probeDeviceOpen: driver (" << driverName << ") error getting sample rate.";
     errorText_ = errorStream_.str();
-    return FAILURE;
+    goto error;
   }
 
   // Set the sample rate only if necessary
   if ( currentRate != sampleRate ) {
     result = ASIOSetSampleRate( (ASIOSampleRate) sampleRate );
     if ( result != ASE_OK ) {
-      drivers.removeCurrentDriver();
       errorStream_ << "RtApiAsio::probeDeviceOpen: driver (" << driverName << ") error setting sample rate (" << sampleRate << ").";
       errorText_ = errorStream_.str();
-      return FAILURE;
+      goto error;
     }
   }
 
@@ -2924,10 +2984,9 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   else channelInfo.isInput = true;
   result = ASIOGetChannelInfo( &channelInfo );
   if ( result != ASE_OK ) {
-    drivers.removeCurrentDriver();
     errorStream_ << "RtApiAsio::probeDeviceOpen: driver (" << driverName << ") error (" << getAsioErrorString( result ) << ") getting data format.";
     errorText_ = errorStream_.str();
-    return FAILURE;
+    goto error;
   }
 
   // Assuming WINDOWS host is always little-endian.
@@ -2956,10 +3015,9 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   }
 
   if ( stream_.deviceFormat[mode] == 0 ) {
-    drivers.removeCurrentDriver();
     errorStream_ << "RtApiAsio::probeDeviceOpen: driver (" << driverName << ") data format not supported by RtAudio.";
     errorText_ = errorStream_.str();
-    return FAILURE;
+    goto error;
   }
 
   // Set the buffer size.  For a duplex stream, this will end up
@@ -2968,49 +3026,63 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   long minSize, maxSize, preferSize, granularity;
   result = ASIOGetBufferSize( &minSize, &maxSize, &preferSize, &granularity );
   if ( result != ASE_OK ) {
-    drivers.removeCurrentDriver();
     errorStream_ << "RtApiAsio::probeDeviceOpen: driver (" << driverName << ") error (" << getAsioErrorString( result ) << ") getting buffer size.";
     errorText_ = errorStream_.str();
-    return FAILURE;
+    goto error;
   }
 
-  if ( *bufferSize < (unsigned int) minSize ) *bufferSize = (unsigned int) minSize;
+  if ( isDuplexInput ) {
-  else if ( *bufferSize > (unsigned int) maxSize ) *bufferSize = (unsigned int) maxSize;
+    // When this is the duplex input (output was opened before), then we have to use the same
-  else if ( granularity == -1 ) {
+    // buffersize as the output, because it might use the preferred buffer size, which most
-    // Make sure bufferSize is a power of two.
+    // likely wasn't passed as input to this. The buffer sizes have to be identically anyway,
-    int log2_of_min_size = 0;
+    // So instead of throwing an error, make them equal. The caller uses the reference
-    int log2_of_max_size = 0;
+    // to the "bufferSize" param as usual to set up processing buffers.
 
-    for ( unsigned int i = 0; i < sizeof(long) * 8; i++ ) {
+    *bufferSize = stream_.bufferSize;
-      if ( minSize & ((long)1 << i) ) log2_of_min_size = i;
-      if ( maxSize & ((long)1 << i) ) log2_of_max_size = i;
-    }
 
-    long min_delta = std::abs( (long)*bufferSize - ((long)1 << log2_of_min_size) );
+  } else {
-    int min_delta_num = log2_of_min_size;
+    if ( *bufferSize == 0 ) *bufferSize = preferSize;
-
+    else if ( *bufferSize < (unsigned int) minSize ) *bufferSize = (unsigned int) minSize;
-    for (int i = log2_of_min_size + 1; i <= log2_of_max_size; i++) {
-      long current_delta = std::abs( (long)*bufferSize - ((long)1 << i) );
-      if (current_delta < min_delta) {
-        min_delta = current_delta;
-        min_delta_num = i;
-      }
-    }
-
-    *bufferSize = ( (unsigned int)1 << min_delta_num );
-    if ( *bufferSize < (unsigned int) minSize ) *bufferSize = (unsigned int) minSize;
     else if ( *bufferSize > (unsigned int) maxSize ) *bufferSize = (unsigned int) maxSize;
-  }
+    else if ( granularity == -1 ) {
-  else if ( granularity != 0 ) {
+      // Make sure bufferSize is a power of two.
-    // Set to an even multiple of granularity, rounding up.
+      int log2_of_min_size = 0;
-    *bufferSize = (*bufferSize + granularity-1) / granularity * granularity;
+      int log2_of_max_size = 0;
+
+      for ( unsigned int i = 0; i < sizeof(long) * 8; i++ ) {
+        if ( minSize & ((long)1 << i) ) log2_of_min_size = i;
+        if ( maxSize & ((long)1 << i) ) log2_of_max_size = i;
+      }
+
+      long min_delta = std::abs( (long)*bufferSize - ((long)1 << log2_of_min_size) );
+      int min_delta_num = log2_of_min_size;
+
+      for (int i = log2_of_min_size + 1; i <= log2_of_max_size; i++) {
+        long current_delta = std::abs( (long)*bufferSize - ((long)1 << i) );
+        if (current_delta < min_delta) {
+          min_delta = current_delta;
+          min_delta_num = i;
+        }
+      }
+
+      *bufferSize = ( (unsigned int)1 << min_delta_num );
+      if ( *bufferSize < (unsigned int) minSize ) *bufferSize = (unsigned int) minSize;
+      else if ( *bufferSize > (unsigned int) maxSize ) *bufferSize = (unsigned int) maxSize;
+    }
+    else if ( granularity != 0 ) {
+      // Set to an even multiple of granularity, rounding up.
+      *bufferSize = (*bufferSize + granularity-1) / granularity * granularity;
+    }
   }
 
-  if ( mode == INPUT && stream_.mode == OUTPUT && stream_.bufferSize != *bufferSize ) {
+  /*
-    drivers.removeCurrentDriver();
+  // we don't use it anymore, see above!
+  // Just left it here for the case...
+  if ( isDuplexInput && stream_.bufferSize != *bufferSize ) {
     errorText_ = "RtApiAsio::probeDeviceOpen: input/output buffersize discrepancy!";
-    return FAILURE;
+    goto error;
   }
+  */
 
   stream_.bufferSize = *bufferSize;
   stream_.nBuffers = 2;
@@ -3022,16 +3094,13 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   stream_.deviceInterleaved[mode] = false;
 
   // Allocate, if necessary, our AsioHandle structure for the stream.
-  AsioHandle *handle = (AsioHandle *) stream_.apiHandle;
   if ( handle == 0 ) {
     try {
       handle = new AsioHandle;
     }
     catch ( std::bad_alloc& ) {
-      //if ( handle == NULL ) {    
-      drivers.removeCurrentDriver();
       errorText_ = "RtApiAsio::probeDeviceOpen: error allocating AsioHandle memory.";
-      return FAILURE;
+      goto error;
     }
     handle->bufferInfos = 0;
 
@@ -3046,15 +3115,14 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   // Create the ASIO internal buffers.  Since RtAudio sets up input
   // and output separately, we'll have to dispose of previously
   // created output buffers for a duplex stream.
-  long inputLatency, outputLatency;
   if ( mode == INPUT && stream_.mode == OUTPUT ) {
     ASIODisposeBuffers();
     if ( handle->bufferInfos ) free( handle->bufferInfos );
   }
 
   // Allocate, initialize, and save the bufferInfos in our stream callbackInfo structure.
-  bool buffersAllocated = false;
+  unsigned int i;
-  unsigned int i, nChannels = stream_.nDeviceChannels[0] + stream_.nDeviceChannels[1];
+  nChannels = stream_.nDeviceChannels[0] + stream_.nDeviceChannels[1];
   handle->bufferInfos = (ASIOBufferInfo *) malloc( nChannels * sizeof(ASIOBufferInfo) );
   if ( handle->bufferInfos == NULL ) {
     errorStream_ << "RtApiAsio::probeDeviceOpen: error allocating bufferInfo memory for driver (" << driverName << ").";
@@ -3075,18 +3143,37 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
     infos->buffers[0] = infos->buffers[1] = 0;
   }
 
+  // prepare for callbacks
+  stream_.sampleRate = sampleRate;
+  stream_.device[mode] = device;
+  stream_.mode = isDuplexInput ? DUPLEX : mode;
+
+  // store this class instance before registering callbacks, that are going to use it
+  asioCallbackInfo = &stream_.callbackInfo;
+  stream_.callbackInfo.object = (void *) this;
+
   // Set up the ASIO callback structure and create the ASIO data buffers.
   asioCallbacks.bufferSwitch = &bufferSwitch;
   asioCallbacks.sampleRateDidChange = &sampleRateChanged;
   asioCallbacks.asioMessage = &asioMessages;
   asioCallbacks.bufferSwitchTimeInfo = NULL;
   result = ASIOCreateBuffers( handle->bufferInfos, nChannels, stream_.bufferSize, &asioCallbacks );
+  if ( result != ASE_OK ) {
+    // Standard method failed. This can happen with strict/misbehaving drivers that return valid buffer size ranges
+    // but only accept the preferred buffer size as parameter for ASIOCreateBuffers. eg. Creatives ASIO driver
+    // in that case, let's be naïve and try that instead
+    *bufferSize = preferSize;
+    stream_.bufferSize = *bufferSize;
+    result = ASIOCreateBuffers( handle->bufferInfos, nChannels, stream_.bufferSize, &asioCallbacks );
+  }
+
   if ( result != ASE_OK ) {
     errorStream_ << "RtApiAsio::probeDeviceOpen: driver (" << driverName << ") error (" << getAsioErrorString( result ) << ") creating buffers.";
     errorText_ = errorStream_.str();
     goto error;
   }
   buffersAllocated = true;  
+  stream_.state = STREAM_STOPPED;
 
   // Set flags for buffer conversion.
   stream_.doConvertBuffer[mode] = false;
@@ -3109,11 +3196,9 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
 
     bool makeBuffer = true;
     bufferBytes = stream_.nDeviceChannels[mode] * formatBytes( stream_.deviceFormat[mode] );
-    if ( mode == INPUT ) {
+    if ( isDuplexInput && stream_.deviceBuffer ) {
-      if ( stream_.mode == OUTPUT && stream_.deviceBuffer ) {
+      unsigned long bytesOut = stream_.nDeviceChannels[0] * formatBytes( stream_.deviceFormat[0] );
-        unsigned long bytesOut = stream_.nDeviceChannels[0] * formatBytes( stream_.deviceFormat[0] );
+      if ( bufferBytes <= bytesOut ) makeBuffer = false;
-        if ( bufferBytes <= bytesOut ) makeBuffer = false;
-      }
     }
 
     if ( makeBuffer ) {
@@ -3127,18 +3212,8 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
     }
   }
 
-  stream_.sampleRate = sampleRate;
-  stream_.device[mode] = device;
-  stream_.state = STREAM_STOPPED;
-  asioCallbackInfo = &stream_.callbackInfo;
-  stream_.callbackInfo.object = (void *) this;
-  if ( stream_.mode == OUTPUT && mode == INPUT )
-    // We had already set up an output stream.
-    stream_.mode = DUPLEX;
-  else
-    stream_.mode = mode;
-
   // Determine device latencies
+  long inputLatency, outputLatency;
   result = ASIOGetLatencies( &inputLatency, &outputLatency );
   if ( result != ASE_OK ) {
     errorStream_ << "RtApiAsio::probeDeviceOpen: driver (" << driverName << ") error (" << getAsioErrorString( result ) << ") getting latency.";
@@ -3158,32 +3233,38 @@ bool RtApiAsio :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   return SUCCESS;
 
  error:
-  if ( buffersAllocated )
+  if ( !isDuplexInput ) {
-    ASIODisposeBuffers();
+    // the cleanup for error in the duplex input, is done by RtApi::openStream
-  drivers.removeCurrentDriver();
+    // So we clean up for single channel only
 
-  if ( handle ) {
+    if ( buffersAllocated )
-    CloseHandle( handle->condition );
+      ASIODisposeBuffers();
-    if ( handle->bufferInfos )
-      free( handle->bufferInfos );
-    delete handle;
-    stream_.apiHandle = 0;
-  }
 
-  for ( int i=0; i<2; i++ ) {
+    drivers.removeCurrentDriver();
-    if ( stream_.userBuffer[i] ) {
+
-      free( stream_.userBuffer[i] );
+    if ( handle ) {
-      stream_.userBuffer[i] = 0;
+      CloseHandle( handle->condition );
+      if ( handle->bufferInfos )
+        free( handle->bufferInfos );
+
+      delete handle;
+      stream_.apiHandle = 0;
+    }
+
+
+    if ( stream_.userBuffer[mode] ) {
+      free( stream_.userBuffer[mode] );
+      stream_.userBuffer[mode] = 0;
+    }
+
+    if ( stream_.deviceBuffer ) {
+      free( stream_.deviceBuffer );
+      stream_.deviceBuffer = 0;
     }
   }
 
-  if ( stream_.deviceBuffer ) {
-    free( stream_.deviceBuffer );
-    stream_.deviceBuffer = 0;
-  }
-
   return FAILURE;
-}
+}////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 void RtApiAsio :: closeStream()
 {
@@ -3635,12 +3716,12 @@ public:
       outIndex_( 0 ) {}
 
   ~WasapiBuffer() {
-    delete buffer_;
+    free( buffer_ );
   }
 
   // sets the length of the internal ring buffer
   void setBufferSize( unsigned int bufferSize, unsigned int formatBytes ) {
-    delete buffer_;
+    free( buffer_ );
 
     buffer_ = ( char* ) calloc( bufferSize, formatBytes );
 
@@ -3799,7 +3880,7 @@ void convertBufferWasapi( char* outBuffer,
   float sampleStep = 1.0f / sampleRatio;
   float inSampleFraction = 0.0f;
 
-  outSampleCount = ( unsigned int ) ( inSampleCount * sampleRatio );
+  outSampleCount = ( unsigned int ) roundf( inSampleCount * sampleRatio );
 
   // frame-by-frame, copy each relative input sample into it's corresponding output sample
   for ( unsigned int outSample = 0; outSample < outSampleCount; outSample++ )
@@ -3945,7 +4026,6 @@ RtAudio::DeviceInfo RtApiWasapi::getDeviceInfo( unsigned int device )
   RtAudio::DeviceInfo info;
   unsigned int captureDeviceCount = 0;
   unsigned int renderDeviceCount = 0;
-  std::wstring deviceName;
   std::string defaultDeviceName;
   bool isCaptureDevice = false;
 
@@ -4048,8 +4128,7 @@ RtAudio::DeviceInfo RtApiWasapi::getDeviceInfo( unsigned int device )
     goto Exit;
   }
 
-  deviceName = defaultDeviceNameProp.pwszVal;
+  defaultDeviceName = convertCharPointerToStdString(defaultDeviceNameProp.pwszVal);
-  defaultDeviceName = std::string( deviceName.begin(), deviceName.end() );
 
   // name
   hr = devicePtr->OpenPropertyStore( STGM_READ, &devicePropStore );
@@ -4066,8 +4145,7 @@ RtAudio::DeviceInfo RtApiWasapi::getDeviceInfo( unsigned int device )
     goto Exit;
   }
 
-  deviceName = deviceNameProp.pwszVal;
+  info.name =convertCharPointerToStdString(deviceNameProp.pwszVal);
-  info.name = std::string( deviceName.begin(), deviceName.end() );
 
   // is default
   if ( isCaptureDevice ) {
@@ -4110,6 +4188,7 @@ RtAudio::DeviceInfo RtApiWasapi::getDeviceInfo( unsigned int device )
   for ( unsigned int i = 0; i < MAX_SAMPLE_RATES; i++ ) {
     info.sampleRates.push_back( SAMPLE_RATES[i] );
   }
+  info.preferredSampleRate = deviceFormat->nSamplesPerSec;
 
   // native format
   info.nativeFormats = 0;
@@ -5245,14 +5324,11 @@ unsigned int RtApiDs :: getDeviceCount( void )
     error( RtAudioError::WARNING );
   }
 
-  // Clean out any devices that may have disappeared.
+  // Clean out any devices that may have disappeared (code update submitted by Eli Zehngut).
-  std::vector< int > indices;
+  for ( unsigned int i=0; i<dsDevices.size(); ) {
-  for ( unsigned int i=0; i<dsDevices.size(); i++ )
+    if ( dsDevices[i].found == false ) dsDevices.erase( dsDevices.begin() + i );
-    if ( dsDevices[i].found == false ) indices.push_back( i );
+    else i++;
-  //unsigned int nErased = 0;
+  }
-  for ( unsigned int i=0; i<indices.size(); i++ )
-    dsDevices.erase( dsDevices.begin()+indices[i] );
-  //dsDevices.erase( dsDevices.begin()-nErased++ );
 
   return static_cast<unsigned int>(dsDevices.size());
 }
@@ -5308,8 +5384,12 @@ RtAudio::DeviceInfo RtApiDs :: getDeviceInfo( unsigned int device )
   info.sampleRates.clear();
   for ( unsigned int k=0; k<MAX_SAMPLE_RATES; k++ ) {
     if ( SAMPLE_RATES[k] >= (unsigned int) outCaps.dwMinSecondarySampleRate &&
-         SAMPLE_RATES[k] <= (unsigned int) outCaps.dwMaxSecondarySampleRate )
+         SAMPLE_RATES[k] <= (unsigned int) outCaps.dwMaxSecondarySampleRate ) {
       info.sampleRates.push_back( SAMPLE_RATES[k] );
+
+      if ( !info.preferredSampleRate || ( SAMPLE_RATES[k] <= 48000 && SAMPLE_RATES[k] > info.preferredSampleRate ) )
+        info.preferredSampleRate = SAMPLE_RATES[k];
+    }
   }
 
   // Get format information.
@@ -6264,6 +6344,7 @@ void RtApiDs :: callbackEvent()
       if ( FAILED( result ) ) {
         errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") getting current write position!";
         errorText_ = errorStream_.str();
+        MUTEX_UNLOCK( &stream_.mutex );
         error( RtAudioError::SYSTEM_ERROR );
         return;
       }
@@ -6271,6 +6352,7 @@ void RtApiDs :: callbackEvent()
       if ( FAILED( result ) ) {
         errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") getting current read position!";
         errorText_ = errorStream_.str();
+        MUTEX_UNLOCK( &stream_.mutex );
         error( RtAudioError::SYSTEM_ERROR );
         return;
       }
@@ -6279,6 +6361,7 @@ void RtApiDs :: callbackEvent()
         if ( FAILED( result ) ) {
           errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") getting current write position!";
           errorText_ = errorStream_.str();
+          MUTEX_UNLOCK( &stream_.mutex );
           error( RtAudioError::SYSTEM_ERROR );
           return;
         }
@@ -6286,6 +6369,7 @@ void RtApiDs :: callbackEvent()
         if ( FAILED( result ) ) {
           errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") getting current read position!";
           errorText_ = errorStream_.str();
+          MUTEX_UNLOCK( &stream_.mutex );
           error( RtAudioError::SYSTEM_ERROR );
           return;
         }
@@ -6307,6 +6391,7 @@ void RtApiDs :: callbackEvent()
       if ( FAILED( result ) ) {
         errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") getting current write position!";
         errorText_ = errorStream_.str();
+        MUTEX_UNLOCK( &stream_.mutex );
         error( RtAudioError::SYSTEM_ERROR );
         return;
       }
@@ -6399,6 +6484,7 @@ void RtApiDs :: callbackEvent()
     if ( FAILED( result ) ) {
       errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") locking buffer during playback!";
       errorText_ = errorStream_.str();
+      MUTEX_UNLOCK( &stream_.mutex );
       error( RtAudioError::SYSTEM_ERROR );
       return;
     }
@@ -6412,6 +6498,7 @@ void RtApiDs :: callbackEvent()
     if ( FAILED( result ) ) {
       errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") unlocking buffer during playback!";
       errorText_ = errorStream_.str();
+      MUTEX_UNLOCK( &stream_.mutex );
       error( RtAudioError::SYSTEM_ERROR );
       return;
     }
@@ -6448,6 +6535,7 @@ void RtApiDs :: callbackEvent()
     if ( FAILED( result ) ) {
       errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") getting current read position!";
       errorText_ = errorStream_.str();
+      MUTEX_UNLOCK( &stream_.mutex );
       error( RtAudioError::SYSTEM_ERROR );
       return;
     }
@@ -6509,6 +6597,7 @@ void RtApiDs :: callbackEvent()
         if ( FAILED( result ) ) {
           errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") getting current read position!";
           errorText_ = errorStream_.str();
+          MUTEX_UNLOCK( &stream_.mutex );
           error( RtAudioError::SYSTEM_ERROR );
           return;
         }
@@ -6523,6 +6612,7 @@ void RtApiDs :: callbackEvent()
     if ( FAILED( result ) ) {
       errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") locking capture buffer!";
       errorText_ = errorStream_.str();
+      MUTEX_UNLOCK( &stream_.mutex );
       error( RtAudioError::SYSTEM_ERROR );
       return;
     }
@@ -6544,6 +6634,7 @@ void RtApiDs :: callbackEvent()
     if ( FAILED( result ) ) {
       errorStream_ << "RtApiDs::callbackEvent: error (" << getErrorString( result ) << ") unlocking capture buffer!";
       errorText_ = errorStream_.str();
+      MUTEX_UNLOCK( &stream_.mutex );
       error( RtAudioError::SYSTEM_ERROR );
       return;
     }
@@ -6582,21 +6673,6 @@ static unsigned __stdcall callbackHandler( void *ptr )
   return 0;
 }
 
-#include "tchar.h"
-
-static std::string convertTChar( LPCTSTR name )
-{
-#if defined( UNICODE ) || defined( _UNICODE )
-  int length = WideCharToMultiByte(CP_UTF8, 0, name, -1, NULL, 0, NULL, NULL);
-  std::string s( length-1, '\0' );
-  WideCharToMultiByte(CP_UTF8, 0, name, -1, &s[0], length, NULL, NULL);
-#else
-  std::string s( name );
-#endif
-
-  return s;
-}
-
 static BOOL CALLBACK deviceQueryCallback( LPGUID lpguid,
                                           LPCTSTR description,
                                           LPCTSTR /*module*/,
@@ -6638,7 +6714,7 @@ static BOOL CALLBACK deviceQueryCallback( LPGUID lpguid,
   }
 
   // If good device, then save its name and guid.
-  std::string name = convertTChar( description );
+  std::string name = convertCharPointerToStdString( description );
   //if ( name == "Primary Sound Driver" || name == "Primary Sound Capture Driver" )
   if ( lpguid == NULL )
     name = "Default Device";
@@ -6820,6 +6896,7 @@ RtAudio::DeviceInfo RtApiAlsa :: getDeviceInfo( unsigned int device )
 
   // Count cards and devices
   card = -1;
+  subdevice = -1;
   snd_card_next( &card );
   while ( card >= 0 ) {
     sprintf( name, "hw:%d", card );
@@ -7033,8 +7110,12 @@ RtAudio::DeviceInfo RtApiAlsa :: getDeviceInfo( unsigned int device )
   // Test our discrete set of sample rate values.
   info.sampleRates.clear();
   for ( unsigned int i=0; i<MAX_SAMPLE_RATES; i++ ) {
-    if ( snd_pcm_hw_params_test_rate( phandle, params, SAMPLE_RATES[i], 0 ) == 0 )
+    if ( snd_pcm_hw_params_test_rate( phandle, params, SAMPLE_RATES[i], 0 ) == 0 ) {
       info.sampleRates.push_back( SAMPLE_RATES[i] );
+
+      if ( !info.preferredSampleRate || ( SAMPLE_RATES[i] <= 48000 && SAMPLE_RATES[i] > info.preferredSampleRate ) )
+        info.preferredSampleRate = SAMPLE_RATES[i];
+    }
   }
   if ( info.sampleRates.size() == 0 ) {
     snd_pcm_close( phandle );
@@ -7959,6 +8040,8 @@ void RtApiAlsa :: callbackEvent()
             errorStream_ << "RtApiAlsa::callbackEvent: error preparing device after underrun, " << snd_strerror( result ) << ".";
             errorText_ = errorStream_.str();
           }
+          else
+            errorText_ =  "RtApiAlsa::callbackEvent: audio write error, underrun.";
         }
         else {
           errorStream_ << "RtApiAlsa::callbackEvent: error, current state is " << snd_pcm_state_name( state ) << ", " << snd_strerror( result ) << ".";
@@ -8067,6 +8150,7 @@ RtAudio::DeviceInfo RtApiPulse::getDeviceInfo( unsigned int /*device*/ )
   for ( const unsigned int *sr = SUPPORTED_SAMPLERATES; *sr; ++sr )
     info.sampleRates.push_back( *sr );
 
+  info.preferredSampleRate = 48000;
   info.nativeFormats = RTAUDIO_SINT16 | RTAUDIO_SINT32 | RTAUDIO_FLOAT32;
 
   return info;
@@ -8429,7 +8513,7 @@ bool RtApiPulse::probeDeviceOpen( unsigned int device, StreamMode mode,
   pah = static_cast<PulseAudioHandle *>( stream_.apiHandle );
 
   int error;
-  if ( !options->streamName.empty() ) streamName = options->streamName;
+  if ( options && !options->streamName.empty() ) streamName = options->streamName;
   switch ( mode ) {
   case INPUT:
     pa_buffer_attr buffer_attr;
@@ -8635,6 +8719,10 @@ RtAudio::DeviceInfo RtApiOss :: getDeviceInfo( unsigned int device )
       for ( unsigned int k=0; k<MAX_SAMPLE_RATES; k++ ) {
         if ( ainfo.rates[i] == SAMPLE_RATES[k] ) {
           info.sampleRates.push_back( SAMPLE_RATES[k] );
+
+          if ( !info.preferredSampleRate || ( SAMPLE_RATES[k] <= 48000 && SAMPLE_RATES[k] > info.preferredSampleRate ) )
+            info.preferredSampleRate = SAMPLE_RATES[k];
+
           break;
         }
       }
@@ -8643,8 +8731,12 @@ RtAudio::DeviceInfo RtApiOss :: getDeviceInfo( unsigned int device )
   else {
     // Check min and max rate values;
     for ( unsigned int k=0; k<MAX_SAMPLE_RATES; k++ ) {
-      if ( ainfo.min_rate <= (int) SAMPLE_RATES[k] && ainfo.max_rate >= (int) SAMPLE_RATES[k] )
+      if ( ainfo.min_rate <= (int) SAMPLE_RATES[k] && ainfo.max_rate >= (int) SAMPLE_RATES[k] ) {
         info.sampleRates.push_back( SAMPLE_RATES[k] );
+
+        if ( !info.preferredSampleRate || ( SAMPLE_RATES[k] <= 48000 && SAMPLE_RATES[k] > info.preferredSampleRate ) )
+          info.preferredSampleRate = SAMPLE_RATES[k];
+      }
     }
   }
 

drivers/rtaudio/RtAudio.h

@@ -310,12 +310,13 @@ class RtAudio
     bool isDefaultOutput;         /*!< true if this is the default output device. */
     bool isDefaultInput;          /*!< true if this is the default input device. */
     std::vector<unsigned int> sampleRates; /*!< Supported sample rates (queried from list of standard rates). */
+    unsigned int preferredSampleRate; /*!< Preferred sample rate, eg. for WASAPI the system sample rate. */
     RtAudioFormat nativeFormats;  /*!< Bit mask of supported data formats. */
 
     // Default constructor.
     DeviceInfo()
       :probed(false), outputChannels(0), inputChannels(0), duplexChannels(0),
-       isDefaultOutput(false), isDefaultInput(false), nativeFormats(0) {}
+       isDefaultOutput(false), isDefaultInput(false), preferredSampleRate(0), nativeFormats(0) {}
   };
 
   //! The structure for specifying input or ouput stream parameters.