Added flite tts engine

client/tts.py

@@ -231,6 +231,74 @@ def say(self, phrase):
             self.play(out_f.name)
 
 
+class FliteTTS(AbstractTTSEngine):
+    """
+    Uses the flite speech synthesizer
+    Requires flite to be available
+    """
+
+    SLUG = 'flite-tts'
+
+    def __init__(self, voice=''):
+        super(self.__class__, self).__init__()
+        self.voice = voice if voice and voice in self.get_voices() else ''
+
+    @classmethod
+    def get_voices(cls):
+        cmd = ['flite', '-lv']
+        voices = []
+        with tempfile.SpooledTemporaryFile() as out_f:
+            subprocess.call(cmd, stdout=out_f)
+            out_f.seek(0)
+            for line in out_f:
+                if line.startswith('Voices available: '):
+                    voices.extend([x.strip() for x in line[18:].split()
+                                   if x.strip()])
+        return voices
+
+    @classmethod
+    def get_config(cls):
+        # FIXME: Replace this as soon as we have a config module
+        config = {}
+        # HMM dir
+        # Try to get hmm_dir from config
+        profile_path = jasperpath.config('profile.yml')
+        if os.path.exists(profile_path):
+            with open(profile_path, 'r') as f:
+                profile = yaml.safe_load(f)
+                if 'flite-tts' in profile:
+                    if 'voice' in profile['flite-tts']:
+                        config['voice'] = profile['flite-tts']['voice']
+        return config
+
+    @classmethod
+    def is_available(cls):
+        return (super(cls, cls).is_available() and
+                diagnose.check_executable('flite') and
+                len(cls.get_voices()) > 0)
+
+    def say(self, phrase):
+        self._logger.debug("Saying '%s' with '%s'", phrase, self.SLUG)
+        cmd = ['flite']
+        if self.voice:
+            cmd.extend(['-voice', self.voice])
+        cmd.extend(['-t', phrase])
+        with tempfile.NamedTemporaryFile(suffix='.wav', delete=False) as f:
+            fname = f.name
+        cmd.append(fname)
+        with tempfile.SpooledTemporaryFile() as out_f:
+            self._logger.debug('Executing %s',
+                               ' '.join([pipes.quote(arg)
+                                         for arg in cmd]))
+            subprocess.call(cmd, stdout=out_f, stderr=out_f)
+            out_f.seek(0)
+            output = out_f.read().strip()
+        if output:
+            self._logger.debug("Output was: '%s'", output)
+        self.play(fname)
+        os.remove(fname)
+
+
 class MacOSXTTS(AbstractTTSEngine):
     """
     Uses the OS X built-in 'say' command