add offline tts using pico (#5005)

* add offline tts using pico

* Update picotts.py

* Update picotts.py

* Update picotts.py

* Update picotts.py

* Update picotts.py

* Update picotts.py

* Update picotts.py

* Update .coveragerc

.coveragerc

@@ -345,6 +345,7 @@ omit =
     homeassistant/components/switch/transmission.py
     homeassistant/components/switch/wake_on_lan.py
     homeassistant/components/thingspeak.py
+    homeassistant/components/tts/picotts.py
     homeassistant/components/upnp.py
     homeassistant/components/weather/openweathermap.py
     homeassistant/components/zeroconf.py

homeassistant/components/tts/picotts.py

@@ -0,0 +1,57 @@
+"""
+Support for the picotts speech service.
+
+For more details about this component, please refer to the documentation at
+https://home-assistant.io/components/tts/picotts/
+"""
+import os
+import tempfile
+import shutil
+import subprocess
+import logging
+import voluptuous as vol
+
+from homeassistant.components.tts import Provider, PLATFORM_SCHEMA, CONF_LANG
+
+_LOGGER = logging.getLogger(__name__)
+
+SUPPORT_LANGUAGES = ['en-US', 'en-GB', 'de-DE', 'es-ES', 'fr-FR', 'it-IT']
+
+DEFAULT_LANG = 'en-US'
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Optional(CONF_LANG, default=DEFAULT_LANG): vol.In(SUPPORT_LANGUAGES),
+})
+
+
+def get_engine(hass, config):
+    """Setup pico speech component."""
+    if shutil.which("pico2wave") is None:
+        _LOGGER.error("'pico2wave' was not found")
+        return False
+    return PicoProvider()
+
+
+class PicoProvider(Provider):
+    """pico speech api provider."""
+
+    def get_tts_audio(self, message, language=None):
+        """Load TTS using pico2wave."""
+        if language not in SUPPORT_LANGUAGES:
+            language = self.language
+        with tempfile.NamedTemporaryFile(suffix='.wav', delete=False) as tmpf:
+            fname = tmpf.name
+        cmd = ['pico2wave', '--wave', fname, '-l', language, message]
+        subprocess.call(cmd)
+        data = None
+        try:
+            with open(fname, 'rb') as voice:
+                data = voice.read()
+        except OSError:
+            _LOGGER.error("Error trying to read %s", fname)
+            return (None, None)
+        finally:
+            os.remove(fname)
+        if data:
+            return ("wav", data)
+        return (None, None)