project1/main.py

import lilv, numpy, time
import soundfile

CHUNK_SIZE = 1024

frames, sample_rate = soundfile.read('a.flac')
num_frames = len(frames)
print(f"{sample_rate}Hz | {int(num_frames/sample_rate/60)}:{int(num_frames/sample_rate%60)}")
frames = frames.astype(numpy.float32)

world = lilv.World()
world.load_all()

plugins = world.get_all_plugins()

plugin = plugins.get_by_uri("http://lsp-plug.in/plugins/lv2/comp_delay_x2_stereo")
if plugin is None:
    print("No plugin comp_delay_x2_stereo")
    exit()

print("Using:", plugin.get_name())

for i in range(plugin.get_num_ports()):
    port = plugin.get_port(i)
    #print(f"Port {i}: {port.get_name()} = {port.get_range()[0]}")

instance = lilv.Instance(plugin, sample_rate)

instance.connect_port(4, numpy.array([1], dtype=numpy.int32)) # while 1 is default it needs to be set as int32 for whatever reason

knob_mode = numpy.array([2], dtype=numpy.float32) # by the way, this can't be put into connect_port, even if just the number is a variable
instance.connect_port(16, knob_mode)

knob_time = numpy.array([10.0], dtype=numpy.float32) # but this can?????? it can be any of the three
instance.connect_port(22, knob_time)

output = numpy.zeros((num_frames, 2), frames.dtype)

input_left_chunk = numpy.zeros(CHUNK_SIZE, frames.dtype)
input_right_chunk = numpy.zeros(CHUNK_SIZE, frames.dtype)
output_left_chunk = numpy.zeros(CHUNK_SIZE, frames.dtype)
output_right_chunk = numpy.zeros(CHUNK_SIZE, frames.dtype)

instance.connect_port(0, input_left_chunk)
instance.connect_port(1, input_right_chunk)
instance.connect_port(2, output_left_chunk)
instance.connect_port(3, output_right_chunk)

instance.activate()

print(f"\nFrames: {num_frames}")
print(f"Chunk size: {CHUNK_SIZE}")
print(f"So {int(numpy.ceil(num_frames/CHUNK_SIZE))} iterations\n")

for start in range(0, num_frames, CHUNK_SIZE):
    end = min(start + CHUNK_SIZE, num_frames)
    chunk_size = end - start
    print(start, chunk_size, end, "       \033[F")

    input_left_chunk[:chunk_size] = frames[start:end, 0]
    input_right_chunk[:chunk_size] = frames[start:end, 1]
    output_left_chunk.fill(0)
    output_right_chunk.fill(0)

    instance.run(chunk_size)

    output[start:end, 0] = output_left_chunk[:chunk_size]
    output[start:end, 1] = output_right_chunk[:chunk_size]

print("done processing                  ")
instance.deactivate()

if numpy.allclose(frames, output, rtol=0.5, atol=0.5):
    print("Warning: output is identical")

soundfile.write('aoutt.flac', output, sample_rate)