Add text to speech functionality to Write - SL #3266

Ass discussed with the Learning Team, Write need a inmediate
access to Text to Speech, the global tts feature is too indirect.

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>

1 files changed, 110 insertions, 0 deletions

diff --git a/speech_gst.py b/speech_gst.py
new file mode 100644
index 0000000..b827ad9
--- /dev/null
+++ b/speech_gst.py
@@ -0,0 +1,110 @@
+# Copyright (C) 2009 Aleksey S. Lim
+#
+# This program 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 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+import gst
+import logging
+
+import speech
+
+_logger = logging.getLogger('read-etexts-activity')
+
+
+def get_all_voices():
+    all_voices = {}
+    for voice in gst.element_factory_make('espeak').props.voices:
+        name, language, dialect = voice
+        if dialect != 'none':
+            all_voices[language + '_' + dialect] = name
+        else:
+            all_voices[language] = name
+    return all_voices
+
+
+def _message_cb(bus, message, pipe):
+    if message.type == gst.MESSAGE_EOS:
+        pipe.set_state(gst.STATE_NULL)
+        if speech.end_text_cb != None:
+            speech.end_text_cb()
+    if message.type == gst.MESSAGE_ERROR:
+        pipe.set_state(gst.STATE_NULL)
+        if pipe is play_speaker[1]:
+            speech.reset_cb()
+    elif message.type == gst.MESSAGE_ELEMENT and \
+            message.structure.get_name() == 'espeak-mark':
+        mark = message.structure['mark']
+        speech.highlight_cb(int(mark))
+
+
+def _create_pipe():
+    pipe = gst.Pipeline('pipeline')
+
+    source = gst.element_factory_make('espeak', 'source')
+    pipe.add(source)
+
+    sink = gst.element_factory_make('autoaudiosink', 'sink')
+    pipe.add(sink)
+    source.link(sink)
+
+    bus = pipe.get_bus()
+    bus.add_signal_watch()
+    bus.connect('message', _message_cb, pipe)
+
+    return (source, pipe)
+
+
+def _speech(speaker, words):
+    speaker[0].props.pitch = speech.pitch
+    speaker[0].props.rate = speech.rate
+    speaker[0].props.voice = speech.voice[1]
+    speaker[0].props.text = words
+    speaker[1].set_state(gst.STATE_NULL)
+    speaker[1].set_state(gst.STATE_PLAYING)
+
+
+info_speaker = _create_pipe()
+play_speaker = _create_pipe()
+play_speaker[0].props.track = 2
+
+
+def voices():
+    return info_speaker[0].props.voices
+
+
+def say(words):
+    _speech(info_speaker, words)
+
+
+def play(words):
+    _speech(play_speaker, words)
+
+
+def pause():
+    play_speaker[1].set_state(gst.STATE_PAUSED)
+
+
+def continue_play():
+    play_speaker[1].set_state(gst.STATE_PLAYING)
+
+
+def is_stopped():
+    for i in play_speaker[1].get_state():
+        if isinstance(i, gst.State) and i == gst.STATE_NULL:
+            return True
+    return False
+
+
+def stop():
+    play_speaker[1].set_state(gst.STATE_NULL)