Skip to content

Accessing in memory

The floating-point samples within a SignalFlow Buffer can be read and written directly from Python.

Using get and set methods

The get() and set() methods can be used to access individual samples, indexed by channel and frame offset.

# Create a 2-channel buffer
buf = Buffer(2, 256)

# Set the sample in channel 1 at index 20 to 0.5
buf.set(1, 20, 0.5)

# Confirm that the sample is set correctly
assert buf.get(1, 20) == 0.5

As a numpy array

The .data property of a Buffer points to a numpy array of shape (num_channels, num_frames), which can be used to read or write the buffer's data in real time.

import time

# Create and play a one-second silent buffer
buf = Buffer(2, graph.sample_rate)
player = BufferPlayer(buf, loop=True)

# Gradually add crackles to the buffer, which will be heard in real-time
while True:[0][np.random.randint(0, graph.sample_rate)] = 1.0[1][np.random.randint(0, graph.sample_rate)] = 1.0

Filling a buffer with the result of a function

Just like when creating a buffer, an existing buffer can be filled with the output of a Python function.

→ Next: Arithmetic operators

Last update: 2024-01-14
Created: 2024-01-14