[Report] soundcard with synthplayer module on macos.

[noboruatkek]

I test an example script for synthplayer module, examples/synth_demo.py, on macos, then I got the following message:

File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/soundcard/coreaudio.py", line 464, in init
raise TypeError("blocksize must be between {} and {}"
TypeError: blocksize must be between 14.0 and 512

After studying soundcard/synthplaer, I noticed that maxblcoksize of AudioUnit may be changed internally. So that requested blocksize may exceed the maxblocksize, then we will get the error message above. I modified soundcard/coreaudio.py slightly, shown below:

@@ -458,12 +458,14 @@
# there are two maximum block sizes for some reason:
maxblocksize = min(self.blocksizerange[1],
self.maxblocksize)

•    if self.blocksizerange[0] <= blocksize <= maxblocksize:
  

•    if self.blocksizerange[0] <= blocksize <= self.blocksizerange[1]:
  

•        if maxblocksize < blocksize: self.maxblocksize=blocksize
         self.blocksize = blocksize
     else:
  

•        raise TypeError("blocksize must be between {} and {}"
  

•                        .format(self.blocksizerange[0],
  

•                                maxblocksize))
  

•        raise TypeError("blocksize({}) must be between {} and {}"
  

•                        .format(blocksize, self.blocksizerange[0],
  

•                                self.blocksizerange[1]))
  
     if isinstance(channels, collections.abc.Iterable):
         if iotype == 'output':
  

@@ -585,6 +587,13 @@
_cac.kAudioUnitScope_Global, 0, "UInt32")
assert maxblocksize
return maxblocksize
+

• @maxblocksize.setter
• def maxblocksize(self, newblocksize):

•    data = _ffi.new("UInt32*", newblocksize)
  

•    self._set_property(
  

•        _cac.kAudioUnitProperty_MaximumFramesPerSlice,
  

•        _cac.kAudioUnitScope_Global, 0, data)
  

Now I can run the synthplayer example script, synth_demo.py, with some parameter adjustment( params.norm_frames_per_chunk=1024) .

Thank you very much for make the nice program available to u.s.

[bastibe]

Please reformat so it makes sense on Github.