[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.