@zrzka Thanks,it's work.

can add cmd+up cmd+down to page up and page down?

using pip install blackmamba

and then run:

#!python3

import blackmamba as bm
bm.main()

Error:
ImportError: No module named 'httplib'

cool,perfect,thanks.

and wish @omz next pythonista update can support it native.

@JonB Thanks.

tbuf = (ctypes.c_int16*1024).from_address(outBuffer.data().value)
# Not error,and using tbuf[1] can get data.

# It's right ??

@JonB other question.

the outBuffer.data() is a UnsafeMutableRawPointer,

print outBuffer.data() 
# >>> c_void_p(4635022848) 

# I need get data,so using 
oData = ObjCInstance(outBuffer.data())

# but Pythonista crash.

How Can get the data?

@JonB I Try Using this, it's ok.

return inBuffer.ptr

convblock=ObjCBlock(conv_block,restype=c_void_p,argtypes=[c_void_p,c_int32,POINTER(c_long)])

if using restype=POINTER(c_void_p)

Error:
PythonistaKit.framework/pylib/site-packages/objc_util.py", line 955, in init
block.invoke = InvokeFuncType(func)
TypeError: invalid result type for callback function

@JonB Test Code it's here.

# -*- coding: utf-8 -*-

from objc_util import *
import ctypes,time,os,struct,array,console

# AVAudio Define
AVAudioEngine=ObjCClass('AVAudioEngine')
AVAudioSession=ObjCClass('AVAudioSession')
AVAudioUnit=ObjCClass('AVAudioUnit')
AVAudioPlayerNode=ObjCClass('AVAudioPlayerNode')
AVAudioFile=ObjCClass('AVAudioFile')
AVAudioPCMBuffer=ObjCClass('AVAudioPCMBuffer')
AVAudioUnitEffect=ObjCClass('AVAudioUnitEffect')
AVAudioFormat=ObjCClass('AVAudioFormat')
AVAudioCompressedBuffer=ObjCClass('AVAudioCompressedBuffer')
AVAudioConverter=ObjCClass('AVAudioConverter')


# AVAudioFormat: 0-other,1-PCM float32,2 PCM float64,3-PCM int16,4-PCM int32
informat = AVAudioFormat.alloc().initWithCommonFormat_sampleRate_channels_interleaved_(3,44100,2,False) 
outformat = AVAudioFormat.alloc().initWithSettings_(ns({'AVSampleRateKey':44100,'AVNumberOfChannelsKey':2,'AVFormatIDKey':struct.unpack('I', b' caa')[0]})) # ,'mFramesPerPacket':1024}))

inBuffer = AVAudioPCMBuffer.alloc().initWithPCMFormat_frameCapacity_(informat,4096)
converter = AVAudioConverter.alloc().initFromFormat_toFormat_(informat,outformat)
outBuffer = AVAudioCompressedBuffer.alloc().initWithFormat_packetCapacity_maximumPacketSize_(outformat, 8,converter.maximumOutputPacketSize())

gcnt = 0

# typedef AVAudioBuffer * _Nullable (^AVAudioConverterInputBlock)(AVAudioPacketCount inNumberOfPackets, AVAudioConverterInputStatus *outStatus);
def conv_block(self,inNumberOfPackets,buffstat):
    global gcnt
    
    # buffstat: 0-have data 1-no data 2-endOfStream   3-error
    print '@1',inNumberOfPackets,buffstat.contents.value
    gcnt += 1
    if gcnt == 1:
        buffstat.contents.value = 0
        print '@2',inNumberOfPackets,buffstat.contents.value
        print '!!! InBuff:',inBuffer,type(inBuffer),ctypes.cast(inBuffer,ctypes.c_void_p) #,ctypes.addressof(inBuffer)
        return None #pointer(c_void_p(inBuffer.ptr))
    else:
        buffstat.contents.value = 2
        return None
        
#convblock=ObjCBlock(conv_block,restype=POINTER(c_void_p),argtypes=[c_void_p,c_int32,POINTER(c_long)])
convblock=ObjCBlock(conv_block,restype=c_void_p,argtypes=[c_void_p,c_int32,POINTER(c_long)])

error=ctypes.c_void_p(0)

status = converter.convertToBuffer_error_withInputFromBlock_(outBuffer,error,convblock)
print '>>Ret1:',status
print '>>out1:',outBuffer
if error:
    print '>>Err:',ObjCInstance(error)

status = converter.convertToBuffer_error_withInputFromBlock_(outBuffer,None,convblock)
print '>>Ret2:',status
print '>>out2:',outBuffer

@JonB
<class 'objc_util.ObjCInstance'>

@JonB said:

1. ctypes.addressof(inBuffer) TypeError: invalid type
   ctypes.cast(pointer(inBuffer),c_void_p) TypeError: type must have storage info

2. maybe the restype = c_void_p is wrong, because c_void_p is int/long or None,but the <AVAudioBuffer> * Nullable it's a buffer. not int/long.