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mirror of https://github.com/cookiengineer/audacity synced 2025-06-17 00:20:06 +02:00
lllucius bc5e7ffce8 Adding new libraries for LV2 support.
lilv-0.16.0
lv2-1.6.0
serd-0.18.2
sord-0.12.0
sratom-0.4.2
2013-10-27 08:56:51 +00:00

97 lines
2.6 KiB
Python
Executable File

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import math
import lilv
import sys
import wave
import numpy
# Read command line arguments
if len(sys.argv) != 4:
print 'USAGE: lv2_apply.py PLUGIN_URI INPUT_WAV OUTPUT_WAV'
sys.exit(1)
# Initialise Lilv
world = lilv.World()
world.load_all()
plugin_uri = world.new_uri(sys.argv[1])
wav_in_path = sys.argv[2]
wav_out_path = sys.argv[3]
# Find plugin
plugin = world.get_all_plugins().get_by_uri(plugin_uri)
if not plugin:
print "Unknown plugin `%s'\n" % plugin_uri
sys.exit(1)
lv2_InputPort = world.new_uri(lilv.LILV_URI_INPUT_PORT)
lv2_OutputPort = world.new_uri(lilv.LILV_URI_OUTPUT_PORT)
lv2_AudioPort = world.new_uri(lilv.LILV_URI_AUDIO_PORT)
n_audio_in = plugin.get_num_ports_of_class(lv2_InputPort, lv2_AudioPort)
n_audio_out = plugin.get_num_ports_of_class(lv2_OutputPort, lv2_AudioPort)
if n_audio_out == 0:
print "Plugin has no audio outputs\n"
sys.exit(1)
# Open input file
wav_in = wave.open(wav_in_path, 'r')
if not wav_in:
print "Failed to open input `%s'\n" % wav_in_path
sys.exit(1)
if wav_in.getnchannels() != n_audio_in:
print "Input has %d channels, but plugin has %d audio inputs\n" % (
wav_in.getnchannels(), n_audio_in)
sys.exit(1)
# Open output file
wav_out = wave.open(wav_out_path, 'w')
if not wav_out:
print "Failed to open output `%s'\n" % wav_out_path
sys.exit(1)
# Set output file to same format as input (except possibly nchannels)
wav_out.setparams(wav_in.getparams())
wav_out.setnchannels(n_audio_out)
rate = wav_in.getframerate()
nframes = wav_in.getnframes()
# Instantiate plugin
instance = lilv.Instance(plugin, rate)
def read_float(wf, nframes):
wav = wf.readframes(nframes)
if wf.getsampwidth() == 4:
wav = wave.struct.unpack("<%ul" % (len(wav) / 4), wav)
wav = [ i / float(math.pow(2, 32)) for i in wav ]
elif wf.getsampwidth() == 2:
wav = wave.struct.unpack("<%uh" % (len(wav) / 2), wav)
wav = [ i / float(math.pow(2, 16)) for i in wav ]
else:
wav = wave.struct.unpack("%uB" % (len(wav)), wav)
wav = [ s - 128 for s in wav ]
wav = [ i / float(math.pow(2, 8)) for i in wav ]
n_channels = wf.getnchannels()
wavs = []
if n_channels > 1:
for i in xrange(n_channels):
wavs.append([ wav[j] for j in xrange(0, len(wav), n_channels) ])
else:
wavs = [ wav ]
return wavs
in_buf = read_float(wav_in, nframes)
# TODO: buffer marshaling
#instance.connect_port(3, in_buf)
print '%s => %s => %s @ %d Hz' % (wav_in_path, plugin.get_name(), wav_out_path, rate)
instance.connect_port(3, in_buf)