From 824aa0a89e0d424e44f5dbb18124eb8101bf12eb Mon Sep 17 00:00:00 2001
From: Joshua Minor <j@lux.vu>
Date: Thu, 10 Jan 2008 09:34:26 +0000
Subject: Speak v3

Lots of major performance enhancements.
---
(limited to 'Speak.activity/audio.py')

diff --git a/Speak.activity/audio.py b/Speak.activity/audio.py
index 484285d..e29ac80 100644
--- a/Speak.activity/audio.py
+++ b/Speak.activity/audio.py
@@ -1,3 +1,27 @@
+# Speak.activity
+# A simple front end to the espeak text-to-speech engine on the XO laptop
+#
+# Copyright (C) 2008  Joshua Minor
+# This file is part of Speak.activity
+#
+# Parts of Speak.activity are based on code from Measure.activity
+# Copyright (C) 2007  Arjun Sarwal - arjun@laptop.org
+# 
+#     Speak.activity is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU General Public License as published by
+#     the Free Software Foundation, either version 3 of the License, or
+#     (at your option) any later version.
+# 
+#     Foobar is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU General Public License for more details.
+# 
+#     You should have received a copy of the GNU General Public License
+#     along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
+
+# This code is a stripped down version of the audio grabber from Measure
+
 import pygst
 pygst.require("0.10")
 import gst
@@ -19,6 +43,8 @@ class AudioGrab(gobject.GObject):
         self.pipeline = None
 
     def playfile(self, filename):
+        self.stop_sound_device()
+        
         # build a pipeline that reads the given file
         # and sends it to both the real audio output
         # and a fake one that we use to draw from
@@ -44,6 +70,36 @@ class AudioGrab(gobject.GObject):
         # how do we detect when the sample has finished playing?
         # we should stop the sound device and stop emitting buffers
         # to save on CPU and battery usage when there is no audio playing
+
+    def playfd(self, fd):
+        self.stop_sound_device()
+
+        # build a pipeline that reads the given file
+        # and sends it to both the real audio output
+        # and a fake one that we use to draw from
+        if self.pipeline is None:
+            p = 'fdsrc name=fd-source ! wavparse ! tee name=tee tee.! audioconvert ! alsasink tee.! queue ! audioconvert name=conv'
+            self.pipeline = gst.parse_launch(p)
+
+            # make a fakesink to capture audio
+            fakesink = gst.element_factory_make("fakesink", "fakesink")
+            fakesink.connect("handoff",self.on_buffer)
+            fakesink.set_property("signal-handoffs",True)
+            self.pipeline.add(fakesink)
+
+            # attach it to the pipeline
+            conv = self.pipeline.get_by_name("conv")
+            gst.element_link_many(conv, fakesink)
+
+        # set the source file
+        self.pipeline.get_by_name("fd-source").set_property('fd', fd)
+
+        # play
+        self.restart_sound_device()
+
+        # how do we detect when the sample has finished playing?
+        # we should stop the sound device and stop emitting buffers
+        # to save on CPU and battery usage when there is no audio playing
         
     def on_quit(self):
         self.pipeline.set_state(gst.STATE_NULL)
@@ -59,7 +115,8 @@ class AudioGrab(gobject.GObject):
         return True
 
     def stop_sound_device(self):
-        self.pipeline.set_state(gst.STATE_NULL)
+        if self.pipeline is not None:
+            self.pipeline.set_state(gst.STATE_NULL)
 
     def restart_sound_device(self):
         self.pipeline.set_state(gst.STATE_PLAYING)
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