class Sampler(object):
def __init__(self, file_path):
self.wave_reader = WaveReader(file_path)
self.num_channels = self.wave_reader.channels
self.data_cache = {}
class Sample(Generator):
def __init__(self, data, num_channels, loop=False, speed=1.0):
Generator.__init__(self)
self.num_channels = num_channels
self.data = data
self.loop = loop
self.speed = speed
def set_speed(self, speed):
self.speed = speed
def _length(self):
if self.loop:
return float('inf')
return len(self.data) / self.num_channels
def _generate(self, frame_count):
output = np.zeros(frame_count * self.num_channels, dtype=np.float32)
# Per channel Values
channel_length = len(self.data)
length = int(frame_count * self.speed)
start = int(self.frame * self.speed)
segment_domain = np.arange(start, start + length)
in_domain = np.linspace(0, frame_count - 1, length)
out_domain = np.arange(0, frame_count)
for c in xrange(self.num_channels):
indices = (c + (segment_domain * self.num_channels)) % channel_length
data = np.array(self.data[indices], dtype=np.float32)
interpolated = np.interp(out_domain, in_domain, data)
output[c::self.num_channels] = interpolated
return output
def sample(self, start, duration, loop=False, speed=1.0):
start_frame = t2f(start)
num_frames = t2f(duration)
if (start_frame, num_frames) not in self.data_cache:
self.wave_reader.set_pos(start_frame)
self.data_cache[(start, num_frames)] = self.wave_reader.read(num_frames)
data = self.data_cache[(start_frame, num_frames)]
return Sampler.Sample(data, self.num_channels, loop, speed)
class WaveFileGenerator(Generator):
def __init__(self, filepath, gain=1):
Generator.__init__(self)
self.wave_reader = WaveReader(filepath)
self.num_channels = self.wave_reader.channels
self.gain = gain
self.paused = False
def stop(self):
self.paused = True
def start(self):
self.paused = False
def _generate(self, frame_count):
if self.paused:
return np.zeros(frame_count * self.num_channels, dtype=np.float32)
read_frames = self.wave_reader.read(frame_count)
output = np.zeros(frame_Count * self.num_channels, dtype=np.float32)
output[:len(read_frames)] += read_frames
output *= self.gain
return output
def __init__(self, file_path):
self.wave_reader = WaveReader(file_path)
self.num_channels = self.wave_reader.channels
self.data_cache = {}
def __init__(self, filepath, gain=1):
Generator.__init__(self)
self.wave_reader = WaveReader(filepath)
self.num_channels = self.wave_reader.channels
self.gain = gain
self.paused = False