Activity Team/gst-plugins-espeak

gst-plugins-espeak

eSpeak library as a sound source for GStreamer.
Plugin uses given text to produce audio output.

Interface

gst-plugins-espeak is a valid gstreamer plugin thus it is a GObject

Properties

GObject properties:

• text text to pronounce
• pitch pitch adjustment, -100 to 100, default is 0
• rate speed in words per minute, -100 to 100, default is 0
• voice use voice file of this name from espeak-data/voices
• gap Word gap. Pause between words, units of 10mS at the default speed, default is 0
• trac track events
  • 0 do not track any events (default)
  • 1 track word events (see #Track words example)
  • 2 track <mark name="<mark-name>"/> marks in text (see #Track marks example)
• voices read-only list of supported voices/languages
• caps read-only caps describing the format of the data

Events

Gstreamer uses separate threads and user should use gst.Bus messages(are processed in main gtk thread) instead of native GObject events. To use messages you need to setup tract property. These are supported gst.Bus messages (see):

• espeak-word before speeching a word, message properties:
  • offset offset in chars from beginning of text
  • len size of word in chars
• espeak-mark mark in text, message properties:
  • offset offset in chars from beginning of text
  • mark name of mark

Usage

Plugin adds new URI scheme

gst-launch espeak://Hi ! autoaudiosink

Full pipline example:

gst-launch espeak text="Hello world" pitch=-50 rate=-50 voice=default ! autoaudiosink

Simple Python example

 import gtk
 import gst

 def gstmessage_cb(bus, message, pipe):
     if message.type in (gst.MESSAGE_EOS, gst.MESSAGE_ERROR):
         pipe.set_state(gst.STATE_NULL)

 pipeline = 'espeak text="Hello world!" ! autoaudiosink'
 pipe = gst.parse_launch(pipeline)

 bus = pipe.get_bus()
 bus.add_signal_watch()
 bus.connect('message', gstmessage_cb, pipe)

 pipe.set_state(gst.STATE_PLAYING)

 gtk.main()

Polyphony example

 import gtk
 import gst
 import random

 def gstmessage_cb(bus, message, pipe):
     if message.type in (gst.MESSAGE_EOS, gst.MESSAGE_ERROR):
         pipe.set_state(gst.STATE_NULL)

 def make_pipe():
     pipeline = 'espeak name=src ! autoaudiosink'
     pipe = gst.parse_launch(pipeline)

     src = pipe.get_by_name('src')
     src.props.text = 'Hello world!'
     src.props.pitch = random.randint(-100, 100)
     src.props.rate = random.randint(-100, 100)

     bus = pipe.get_bus()
     bus.add_signal_watch()
     bus.connect('message', gstmessage_cb, pipe)

     pipe.set_state(gst.STATE_PLAYING)

 for i in range(10):
     make_pipe()

 gtk.main()

Resources

• Sources
• Tarballs