support sample rate auto convert using PortAudio paWinWasapiAutoConvert flag when in share mode (#492)

Author: yinkaisheng

sounddevice.py

@@ -2413,7 +2413,7 @@ def __init__(self, channel_map=None, change_device_parameters=False,
 
 class WasapiSettings:
 
-    def __init__(self, exclusive=False):
+    def __init__(self, exclusive=False, auto_convert=False):
         """WASAPI-specific input/output settings.
 
         Objects of this class can be used as *extra_settings* argument
@@ -2427,6 +2427,10 @@ def __init__(self, exclusive=False):
             Exclusive mode allows to deliver audio data directly to
             hardware bypassing software mixing.
 
+        auto_convert : bool
+            auto_convert allows to resample audio data to hardware
+            supported samplerate when in shared mode(None exclusive mode)
+
         Examples
         --------
         Setting exclusive mode when calling `play()`:
@@ -2444,6 +2448,8 @@ def __init__(self, exclusive=False):
         flags = 0x0
         if exclusive:
             flags |= _lib.paWinWasapiExclusive
+        elif auto_convert:
+            flags |= _lib.paWinWasapiAutoConvert
         self._streaminfo = _ffi.new('PaWasapiStreamInfo*', dict(
             size=_ffi.sizeof('PaWasapiStreamInfo'),
             hostApiType=_lib.paWASAPI,

sounddevice_build.py

@@ -254,7 +254,8 @@
     paWinWasapiRedirectHostProcessor    = 2,
     paWinWasapiUseChannelMask           = 4,
     paWinWasapiPolling                  = 8,
-    paWinWasapiThreadPriority           = 16
+    paWinWasapiThreadPriority           = 16,
+    paWinWasapiAutoConvert              = 64
 } PaWasapiFlags;
 
 typedef void (*PaWasapiHostProcessorCallback) (