ecasound 2.7.2 (2010) package. ubuntu's ecasound package is only at ecasound 2.2 way back from 2003. had to modify ecacontrol.py to use subprocess module instead of deprecated popen2

ecasound-2.7.2/examples/ecidoc_example.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+
+# -----------------------------------------------------------------------
+# Implementation of the following:
+# 
+# 1. Setup ECI to read audio from file, apply a 100Hz lowpass filter, and 
+#    send it to the soundcard (/dev/dsp).
+# 2. Every second, check the current position. If the stream has
+#    been running for over 15 seconds, exit immediately. Also,
+#    every second, increase the lowpass filter's cutoff frequency
+#    by 500Hz.
+# 3. Stop the stream (if not already finished) and disconnect the 
+#    chainsetup. Print chain operator status info.
+# -----------------------------------------------------------------------
+
+import time
+from pyeca import *
+e = ECA_CONTROL_INTERFACE()
+e.command("cs-add play_chainsetup")
+e.command("c-add 1st_chain")
+e.command("ai-add foo.wav")
+e.command("ao-add /dev/dsp")
+e.command("cop-add -efl:100")
+e.command("cop-select 1")
+e.command("copp-select 1")
+e.command("cs-connect")
+e.command("start")
+cutoff_inc = 500.0
+while 1:
+    time.sleep(1)
+    e.command("engine-status")
+    if e.last_string() != "running": break
+    e.command("get-position")
+    curpos = e.last_float()
+    if curpos > 15: break
+    e.command("copp-get")
+    next_cutoff = cutoff_inc + e.last_float()
+    e.command_float_arg("copp-set", next_cutoff)
+e.command("stop")
+e.command("cs-disconnect")
+e.command("cop-status")
+print "Chain operator status: ", e.last_string()