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Audio Recorder.py
from ctypes import c_void_p, c_char_p, c_double, c_float, c_int, cdll, util, c_bool
import os
import time
# Load Objective-C runtime:
objc = cdll.LoadLibrary(util.find_library('objc'))
objc.sel_getName.restype = c_char_p
objc.sel_getName.argtypes = [c_void_p]
objc.sel_registerName.restype = c_void_p
objc.sel_registerName.argtypes = [c_char_p]
objc.objc_getClass.argtypes = [c_char_p]
objc.objc_getClass.restype = c_void_p
# Some helper methods:
def obj_to_str(obj):
objc.objc_msgSend.argtypes = [c_void_p, c_void_p]
objc.objc_msgSend.restype = c_void_p
desc = objc.objc_msgSend(obj, objc.sel_registerName('description'))
objc.objc_msgSend.argtypes = [c_void_p, c_void_p]
objc.objc_msgSend.restype = c_char_p
return objc.objc_msgSend(desc, objc.sel_registerName('UTF8String'))
def msg(obj, restype, sel, argtypes=None, *args):
if argtypes is None:
argtypes = []
objc.objc_msgSend.argtypes = [c_void_p, c_void_p] + argtypes
objc.objc_msgSend.restype = restype
res = objc.objc_msgSend(obj, objc.sel_registerName(sel), *args)
return res
def cls(cls_name):
return objc.objc_getClass(cls_name)
def nsstr(s):
return msg(cls('NSString'), c_void_p, 'stringWithUTF8String:', [c_char_p], s)
def nsurl_from_path(s):
return msg(cls('NSURL'), c_void_p, 'fileURLWithPath:', [c_void_p], nsstr(s))
def ns_int(i):
return msg(cls('NSNumber'), c_void_p, 'numberWithInt:', [c_int], i)
def ns_float(f):
return msg(cls('NSNumber'), c_void_p, 'numberWithFloat:', [c_float], f)
def main():
AVAudioSession = cls('AVAudioSession')
shared_session = msg(AVAudioSession, c_void_p, 'sharedInstance')
category_set = msg(shared_session, c_bool, 'setCategory:error:', [c_void_p, c_void_p], nsstr('AVAudioSessionCategoryPlayAndRecord'), None)
settings = msg(cls('NSMutableDictionary'), c_void_p, 'dictionary')
kAudioFormatMPEG4AAC = 1633772320
msg(settings, None, 'setObject:forKey:', [c_void_p, c_void_p], ns_int(kAudioFormatMPEG4AAC), nsstr('AVFormatIDKey'))
msg(settings, None, 'setObject:forKey:', [c_void_p, c_void_p], ns_float(44100.0), nsstr('AVSampleRateKey'))
msg(settings, None, 'setObject:forKey:', [c_void_p, c_void_p], ns_int(2), nsstr('AVNumberOfChannelsKey'))
output_path = os.path.abspath('Recording.m4a')
out_url = nsurl_from_path(output_path)
recorder = msg(cls('AVAudioRecorder'), c_void_p, 'alloc')
recorder = msg(recorder, c_void_p, 'initWithURL:settings:error:', [c_void_p, c_void_p, c_void_p], out_url, settings, None)
started_recording = msg(recorder, c_bool, 'record')
if started_recording:
print 'Recording started, press the "stop script" button to end recording...'
try:
while True:
pass
except KeyboardInterrupt:
print 'Stopping...'
msg(recorder, None, 'stop')
msg(recorder, None, 'release')
print 'Stopped recording.'
import console
console.quicklook(os.path.abspath('Recording.m4a'))
if __name__ == '__main__':
main()

cclauss commented Aug 6, 2015

Could this be simplified with the new objc_util module?

Dutcho commented Dec 26, 2015

@cclauss: simplified with the new objc_util module in my fork

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