cpython-withatomic / Lib / audiodev.py

The 2.7 branch has multiple heads

"""Classes for manipulating audio devices (currently only for Sun and SGI)"""
from warnings import warnpy3k
warnpy3k("the audiodev module has been removed in Python 3.0", stacklevel=2)
del warnpy3k

__all__ = ["error","AudioDev"]

class error(Exception):
    pass

class Play_Audio_sgi:
    # Private instance variables
##      if 0: access frameratelist, nchannelslist, sampwidthlist, oldparams, \
##                params, config, inited_outrate, inited_width, \
##                inited_nchannels, port, converter, classinited: private

    classinited = 0
    frameratelist = nchannelslist = sampwidthlist = None

    def initclass(self):
        import AL
        self.frameratelist = [
                  (48000, AL.RATE_48000),
                  (44100, AL.RATE_44100),
                  (32000, AL.RATE_32000),
                  (22050, AL.RATE_22050),
                  (16000, AL.RATE_16000),
                  (11025, AL.RATE_11025),
                  ( 8000,  AL.RATE_8000),
                  ]
        self.nchannelslist = [
                  (1, AL.MONO),
                  (2, AL.STEREO),
                  (4, AL.QUADRO),
                  ]
        self.sampwidthlist = [
                  (1, AL.SAMPLE_8),
                  (2, AL.SAMPLE_16),
                  (3, AL.SAMPLE_24),
                  ]
        self.classinited = 1

    def __init__(self):
        import al, AL
        if not self.classinited:
            self.initclass()
        self.oldparams = []
        self.params = [AL.OUTPUT_RATE, 0]
        self.config = al.newconfig()
        self.inited_outrate = 0
        self.inited_width = 0
        self.inited_nchannels = 0
        self.converter = None
        self.port = None
        return

    def __del__(self):
        if self.port:
            self.stop()
        if self.oldparams:
            import al, AL
            al.setparams(AL.DEFAULT_DEVICE, self.oldparams)
            self.oldparams = []

    def wait(self):
        if not self.port:
            return
        import time
        while self.port.getfilled() > 0:
            time.sleep(0.1)
        self.stop()

    def stop(self):
        if self.port:
            self.port.closeport()
            self.port = None
        if self.oldparams:
            import al, AL
            al.setparams(AL.DEFAULT_DEVICE, self.oldparams)
            self.oldparams = []

    def setoutrate(self, rate):
        for (raw, cooked) in self.frameratelist:
            if rate == raw:
                self.params[1] = cooked
                self.inited_outrate = 1
                break
        else:
            raise error, 'bad output rate'

    def setsampwidth(self, width):
        for (raw, cooked) in self.sampwidthlist:
            if width == raw:
                self.config.setwidth(cooked)
                self.inited_width = 1
                break
        else:
            if width == 0:
                import AL
                self.inited_width = 0
                self.config.setwidth(AL.SAMPLE_16)
                self.converter = self.ulaw2lin
            else:
                raise error, 'bad sample width'

    def setnchannels(self, nchannels):
        for (raw, cooked) in self.nchannelslist:
            if nchannels == raw:
                self.config.setchannels(cooked)
                self.inited_nchannels = 1
                break
        else:
            raise error, 'bad # of channels'

    def writeframes(self, data):
        if not (self.inited_outrate and self.inited_nchannels):
            raise error, 'params not specified'
        if not self.port:
            import al, AL
            self.port = al.openport('Python', 'w', self.config)
            self.oldparams = self.params[:]
            al.getparams(AL.DEFAULT_DEVICE, self.oldparams)
            al.setparams(AL.DEFAULT_DEVICE, self.params)
        if self.converter:
            data = self.converter(data)
        self.port.writesamps(data)

    def getfilled(self):
        if self.port:
            return self.port.getfilled()
        else:
            return 0

    def getfillable(self):
        if self.port:
            return self.port.getfillable()
        else:
            return self.config.getqueuesize()

    # private methods
##      if 0: access *: private

    def ulaw2lin(self, data):
        import audioop
        return audioop.ulaw2lin(data, 2)

class Play_Audio_sun:
##      if 0: access outrate, sampwidth, nchannels, inited_outrate, inited_width, \
##                inited_nchannels, converter: private

    def __init__(self):
        self.outrate = 0
        self.sampwidth = 0
        self.nchannels = 0
        self.inited_outrate = 0
        self.inited_width = 0
        self.inited_nchannels = 0
        self.converter = None
        self.port = None
        return

    def __del__(self):
        self.stop()

    def setoutrate(self, rate):
        self.outrate = rate
        self.inited_outrate = 1

    def setsampwidth(self, width):
        self.sampwidth = width
        self.inited_width = 1

    def setnchannels(self, nchannels):
        self.nchannels = nchannels
        self.inited_nchannels = 1

    def writeframes(self, data):
        if not (self.inited_outrate and self.inited_width and self.inited_nchannels):
            raise error, 'params not specified'
        if not self.port:
            import sunaudiodev, SUNAUDIODEV
            self.port = sunaudiodev.open('w')
            info = self.port.getinfo()
            info.o_sample_rate = self.outrate
            info.o_channels = self.nchannels
            if self.sampwidth == 0:
                info.o_precision = 8
                self.o_encoding = SUNAUDIODEV.ENCODING_ULAW
                # XXX Hack, hack -- leave defaults
            else:
                info.o_precision = 8 * self.sampwidth
                info.o_encoding = SUNAUDIODEV.ENCODING_LINEAR
                self.port.setinfo(info)
        if self.converter:
            data = self.converter(data)
        self.port.write(data)

    def wait(self):
        if not self.port:
            return
        self.port.drain()
        self.stop()

    def stop(self):
        if self.port:
            self.port.flush()
            self.port.close()
            self.port = None

    def getfilled(self):
        if self.port:
            return self.port.obufcount()
        else:
            return 0

##    # Nobody remembers what this method does, and it's broken. :-(
##    def getfillable(self):
##        return BUFFERSIZE - self.getfilled()

def AudioDev():
    # Dynamically try to import and use a platform specific module.
    try:
        import al
    except ImportError:
        try:
            import sunaudiodev
            return Play_Audio_sun()
        except ImportError:
            try:
                import Audio_mac
            except ImportError:
                raise error, 'no audio device'
            else:
                return Audio_mac.Play_Audio_mac()
    else:
        return Play_Audio_sgi()

def test(fn = None):
    import sys
    if sys.argv[1:]:
        fn = sys.argv[1]
    else:
        fn = 'f:just samples:just.aif'
    import aifc
    af = aifc.open(fn, 'r')
    print fn, af.getparams()
    p = AudioDev()
    p.setoutrate(af.getframerate())
    p.setsampwidth(af.getsampwidth())
    p.setnchannels(af.getnchannels())
    BUFSIZ = af.getframerate()/af.getsampwidth()/af.getnchannels()
    while 1:
        data = af.readframes(BUFSIZ)
        if not data: break
        print len(data)
        p.writeframes(data)
    p.wait()

if __name__ == '__main__':
    test()
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