From 3e9f130155da5d36182fc4b59b0b6f2fba8c02a0 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 12 Feb 2011 21:54:27 +0000
Subject: Add lv2_apply.py experiment to repository (not working yet).

git-svn-id: http://svn.drobilla.net/lad/trunk/slv2@2944 a436a847-0d15-0410-975c-d299462d15a1
---
 swig/python/lv2_apply.py | 114 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100755 swig/python/lv2_apply.py

diff --git a/swig/python/lv2_apply.py b/swig/python/lv2_apply.py
new file mode 100755
index 0000000..8dfc200
--- /dev/null
+++ b/swig/python/lv2_apply.py
@@ -0,0 +1,114 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import math
+import slv2
+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)
+
+plugin_uri   = sys.argv[1]
+wav_in_path  = sys.argv[2]
+wav_out_path = sys.argv[3]
+
+# Initialise SLV2
+world = slv2.World()
+world.load_all()
+
+# Find plugin
+plugin = world.get_plugin(plugin_uri)
+if not plugin:
+    print "Unknown plugin `%s'\n" % plugin_uri
+    sys.exit(1)
+
+lv2_InputPort  = world.new_uri(slv2.SLV2_PORT_CLASS_INPUT)
+lv2_OutputPort = world.new_uri(slv2.SLV2_PORT_CLASS_OUTPUT)
+lv2_AudioPort  = world.new_uri(slv2.SLV2_PORT_CLASS_AUDIO)
+
+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)
+
+print "NUM IN:", n_audio_in
+print "NUM OUT:", n_audio_out
+
+# 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 = slv2.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
+
+#input_raw = wav_in.readframes(nframes)
+#input_frames = wave.struct.unpack('@h', input_raw)
+#print input_frames
+
+in_buf    = read_float(wav_in, nframes)
+out_l_buf = []
+out_r_buf = []
+for i in xrange(nframes):
+    # FIXME: slow
+    out_l_buf += [ 0.0 ] # FIXME: slow
+    out_r_buf += [ 0.0 ] # FIXME: slow
+
+print '%s => %s => %s @ %d Hz' % (wav_in_path, plugin.get_name(), wav_out_path, rate)
+
+print 'Instance:', instance
+
+#instance.connect_port(3, in_buf)
+#instance.connect_port(4, out_l_buf)
+#instance.connect_port(5, our_r_buf)
+
+#buf = numpy.array(in_buf)
+#print buf
+
+instance.connect_port(3, in_buf)
-- 
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