Python audioop.max方法代碼示例

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def test_issue7673(self):
        state = None
        for data, size in INVALID_DATA:
            size2 = size
            self.assertRaises(audioop.error, audioop.getsample, data, size, 0)
            self.assertRaises(audioop.error, audioop.max, data, size)
            self.assertRaises(audioop.error, audioop.minmax, data, size)
            self.assertRaises(audioop.error, audioop.avg, data, size)
            self.assertRaises(audioop.error, audioop.rms, data, size)
            self.assertRaises(audioop.error, audioop.avgpp, data, size)
            self.assertRaises(audioop.error, audioop.maxpp, data, size)
            self.assertRaises(audioop.error, audioop.cross, data, size)
            self.assertRaises(audioop.error, audioop.mul, data, size, 1.0)
            self.assertRaises(audioop.error, audioop.tomono, data, size, 0.5, 0.5)
            self.assertRaises(audioop.error, audioop.tostereo, data, size, 0.5, 0.5)
            self.assertRaises(audioop.error, audioop.add, data, data, size)
            self.assertRaises(audioop.error, audioop.bias, data, size, 0)
            self.assertRaises(audioop.error, audioop.reverse, data, size)
            self.assertRaises(audioop.error, audioop.lin2lin, data, size, size2)
            self.assertRaises(audioop.error, audioop.ratecv, data, size, 1, 1, 1, state)
            self.assertRaises(audioop.error, audioop.lin2ulaw, data, size)
            self.assertRaises(audioop.error, audioop.lin2alaw, data, size)
            self.assertRaises(audioop.error, audioop.lin2adpcm, data, size, state) 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def test_string(self):
        data = 'abcd'
        size = 2
        self.assertRaises(TypeError, audioop.getsample, data, size, 0)
        self.assertRaises(TypeError, audioop.max, data, size)
        self.assertRaises(TypeError, audioop.minmax, data, size)
        self.assertRaises(TypeError, audioop.avg, data, size)
        self.assertRaises(TypeError, audioop.rms, data, size)
        self.assertRaises(TypeError, audioop.avgpp, data, size)
        self.assertRaises(TypeError, audioop.maxpp, data, size)
        self.assertRaises(TypeError, audioop.cross, data, size)
        self.assertRaises(TypeError, audioop.mul, data, size, 1.0)
        self.assertRaises(TypeError, audioop.tomono, data, size, 0.5, 0.5)
        self.assertRaises(TypeError, audioop.tostereo, data, size, 0.5, 0.5)
        self.assertRaises(TypeError, audioop.add, data, data, size)
        self.assertRaises(TypeError, audioop.bias, data, size, 0)
        self.assertRaises(TypeError, audioop.reverse, data, size)
        self.assertRaises(TypeError, audioop.lin2lin, data, size, size)
        self.assertRaises(TypeError, audioop.ratecv, data, size, 1, 1, 1, None)
        self.assertRaises(TypeError, audioop.lin2ulaw, data, size)
        self.assertRaises(TypeError, audioop.lin2alaw, data, size)
        self.assertRaises(TypeError, audioop.lin2adpcm, data, size, None) 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def __db_level(self, rms_mode: bool = False) -> Tuple[float, float]:
        """
        Returns the average audio volume level measured in dB (range -60 db to 0 db)
        If the sample is stereo, you get back a tuple: (left_level, right_level)
        If the sample is mono, you still get a tuple but both values will be the same.
        This method is probably only useful if processed on very short sample fragments in sequence,
        so the db levels could be used to show a level meter for the duration of the sample.
        """
        maxvalue = 2**(8*self.__samplewidth-1)
        if self.nchannels == 1:
            if rms_mode:
                peak_left = peak_right = (audioop.rms(self.__frames, self.__samplewidth)+1)/maxvalue
            else:
                peak_left = peak_right = (audioop.max(self.__frames, self.__samplewidth)+1)/maxvalue
        else:
            left_frames = audioop.tomono(self.__frames, self.__samplewidth, 1, 0)
            right_frames = audioop.tomono(self.__frames, self.__samplewidth, 0, 1)
            if rms_mode:
                peak_left = (audioop.rms(left_frames, self.__samplewidth)+1)/maxvalue
                peak_right = (audioop.rms(right_frames, self.__samplewidth)+1)/maxvalue
            else:
                peak_left = (audioop.max(left_frames, self.__samplewidth)+1)/maxvalue
                peak_right = (audioop.max(right_frames, self.__samplewidth)+1)/maxvalue
        # cut off at the bottom at -60 instead of all the way down to -infinity
        return max(20.0*math.log(peak_left, 10), -60.0), max(20.0*math.log(peak_right, 10), -60.0) 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def echo(self, length: float, amount: int, delay: float, decay: float) -> 'Sample':
        """
        Adds the given amount of echos into the end of the sample,
        using a given length of sample data (from the end of the sample).
        The decay is the factor with which each echo is decayed in volume (can be >1 to increase in volume instead).
        If you use a very short delay the echos blend into the sound and the effect is more like a reverb.
        """
        if self.__locked:
            raise RuntimeError("cannot modify a locked sample")
        if amount > 0:
            length = max(0, self.duration - length)
            echo = self.copy()
            echo.__frames = self.__frames[self.frame_idx(length):]
            echo_amp = decay
            for _ in range(amount):
                if echo_amp < 1.0/(2**(8*self.__samplewidth-1)):
                    # avoid computing echos that you can't hear
                    break
                length += delay
                echo = echo.copy().amplify(echo_amp)
                self.mix_at(length, echo)
                echo_amp *= decay
        return self 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def get_microphone_level():
    """
    source: http://stackoverflow.com/questions/26478315/getting-volume-levels-from-pyaudio-for-use-in-arduino
    audioop.max alternative to audioop.rms
    """
    chunk = 1024
    FORMAT = pyaudio.paInt16
    CHANNELS = 1
    RATE = 44100
    p = pyaudio.PyAudio()

    s = p.open(format=FORMAT,
               channels=CHANNELS,
               rate=RATE,
               input=True,
               frames_per_buffer=chunk)
    global levels
    while True:
        data = s.read(chunk)
        mx = audioop.rms(data, 2)
        if len(levels) >= 100:
            levels = []
        levels.append(mx) 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def test_max(self):
        for w in 1, 2, 4:
            self.assertEqual(audioop.max(b'', w), 0)
            p = packs[w]
            self.assertEqual(audioop.max(p(5), w), 5)
            self.assertEqual(audioop.max(p(5, -8, -1), w), 8)
            self.assertEqual(audioop.max(p(maxvalues[w]), w), maxvalues[w])
            self.assertEqual(audioop.max(p(minvalues[w]), w), -minvalues[w])
            self.assertEqual(audioop.max(datas[w], w), -minvalues[w]) 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def test_max(self):
        for w in 1, 2, 3, 4:
            self.assertEqual(audioop.max(b'', w), 0)
            self.assertEqual(audioop.max(bytearray(), w), 0)
            self.assertEqual(audioop.max(memoryview(b''), w), 0)
            p = packs[w]
            self.assertEqual(audioop.max(p(5), w), 5)
            self.assertEqual(audioop.max(p(5, -8, -1), w), 8)
            self.assertEqual(audioop.max(p(maxvalues[w]), w), maxvalues[w])
            self.assertEqual(audioop.max(p(minvalues[w]), w), -minvalues[w])
            self.assertEqual(audioop.max(datas[w], w), -minvalues[w]) 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def maximum(self) -> int:
        return audioop.max(self.__frames, self.samplewidth)     # type: ignore 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def amplify_max(self) -> 'Sample':
        """Amplify the sample to maximum volume without clipping or overflow happening."""
        if self.__locked:
            raise RuntimeError("cannot modify a locked sample")
        max_amp = audioop.max(self.__frames, self.samplewidth)
        max_target = 2 ** (8 * self.samplewidth - 1) - 2
        if max_amp > 0:
            factor = max_target/max_amp
            self.__frames = audioop.mul(self.__frames, self.samplewidth, factor)
        return self 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def modulate_amp(self, modulation_source: Union[Oscillator, Sequence[float], 'Sample', Iterator[float]]) -> 'Sample':
        """
        Perform amplitude modulation by another waveform or oscillator.
        You can use a Sample (or array of sample values) or an oscillator as modulator.
        If you use a Sample (or array), it will be cycled if needed and its maximum amplitude
        is scaled to be 1.0, effectively using it as if it was an oscillator.
        """
        if self.__locked:
            raise RuntimeError("cannot modify a locked sample")
        frames = self.get_frame_array()
        if isinstance(modulation_source, (Sample, list, array.array)):
            # modulator is a waveform, turn that into an 'oscillator' ran
            if isinstance(modulation_source, Sample):
                modulation_source = modulation_source.get_frame_array()
            biggest = max(max(modulation_source), abs(min(modulation_source)))
            actual_modulator = (v/biggest for v in itertools.cycle(modulation_source))   # type: ignore
        elif isinstance(modulation_source, Oscillator):
            actual_modulator = itertools.chain.from_iterable(modulation_source.blocks())    # type: ignore
        else:
            actual_modulator = iter(modulation_source)  # type: ignore
        for i in range(len(frames)):
            frames[i] = int(frames[i] * next(actual_modulator))
        self.__frames = frames.tobytes()
        if sys.byteorder == "big":
            self.__frames = audioop.byteswap(self.__frames, self.__samplewidth)
        return self 

# 需要導入模塊: import audioop [as 別名]
# 或者: from audioop import max [as 別名]
def testmax(data):
    if verbose:
        print 'max'
    if audioop.max(data[0], 1) != 2 or \
              audioop.max(data[1], 2) != 2 or \
              audioop.max(data[2], 4) != 2:
        return 0
    return 1