02-sharing-audio.py - Sharing audio signals between processes.
============================================================================================================================================


Usage:
    python3 -i 02-sharing-audio.py

.. code-block:: python

    import sys, time, random, multiprocessing
    from pyo import *
    
    if sys.platform.startswith("linux"):
        audio = "jack"
    elif sys.platform.startswith("darwin"):
        audio = "portaudio"
        print("SharedTable does not behave correctly under MacOS... This example doesn't work.")
    else:
        print("Multicore examples don't run under Windows... Sorry!")
        exit()
    
    
    class Proc(multiprocessing.Process):
        def __init__(self, create):
            super(Proc, self).__init__()
            self.daemon = True
            self.create = create
    
        def run(self):
            self.server = Server(audio=audio)
            self.server.deactivateMidi()
            self.server.boot().start()
            bufsize = self.server.getBufferSize()
    
            nbands = 20
            names = ["/f%02d" % i for i in range(nbands)]
    
            if self.create:  # 50 bands frequency splitter.
                freq = [20 * 1.1487 ** i for i in range(nbands)]
                amp = [pow(10, (i * -1) * 0.05) * 8 for i in range(nbands)]
                self.input = SfPlayer(SNDS_PATH + "/transparent.aif", loop=True)
                self.filts = IRWinSinc(self.input, freq, freq, 3, 128, amp)
                self.table = SharedTable(names, create=True, size=bufsize)
                self.recrd = TableFill(self.filts, self.table)
            else:  # Independent transposition per band.
                self.table = SharedTable(names, create=False, size=bufsize)
                self.tscan = TableScan(self.table)
                transpofac = [random.uniform(0.98, 1.02) for i in range(nbands)]
                self.pvana = PVAnal(self.tscan, size=1024, overlaps=4)
                self.pvtra = PVTranspose(self.pvana, transpo=transpofac)
                self.pvsyn = PVSynth(self.pvtra).out()
    
            time.sleep(30)
            self.server.stop()
    
    
    if __name__ == "__main__":
        analysis = Proc(create=True)
        synthesis = Proc(create=False)
        analysis.start()
        synthesis.start()

