Add new TTS engine: gTTS

Dockerfile

@@ -7,6 +7,7 @@ LABEL maintainer="pedroetb@gmail.com"
 ARG APT_REPOSITORY="deb http://ftp.de.debian.org/debian stretch main non-free"
 
 ARG GOOGLE_SPEECH_VERSION=1.1.0
+ARG GTTS_VERSION=2.0.3
 ARG ESPEAK_VERSION=1.48.04+dfsg-5+b1
 ARG FESTIVAL_VERSION=1:2.4~release-3+b1
 
@@ -31,7 +32,8 @@ RUN echo ${APT_REPOSITORY} >> /etc/apt/sources.list && \
 		festvox-ellpc11k=${FESTVOX_ELLPC11K_VERSION} \
 		espeak=${ESPEAK_VERSION} && \
 	pip3 install \
-		google_speech==${GOOGLE_SPEECH_VERSION} && \
+		google_speech==${GOOGLE_SPEECH_VERSION} \
+		gTTS==${GTTS_VERSION} && \
 	apt-get remove --purge -y \
 		python3-pip \
 		python3-setuptools \

README.md

@@ -11,10 +11,13 @@ First, you should install the supported TTS engines:
 ```
 $ apt install python3 sox libsox-fmt-mp3
 $ pip install google_speech
+```
+
+### gTTS
 
-# Run only when you need to upgrade
-$ pip install --upgrade pip
-$ pip install google_speech --upgrade
+```
+$ apt install python3 sox libsox-fmt-mp3
+$ pip install gTTS
 ```
 
 ### Festival
@@ -103,6 +106,14 @@ You need to be online to communicate with Google servers.
 
 Learn more at https://github.com/desbma/GoogleSpeech
 
+### gTTS
+
+Google Text-to-Speech (gTTS) is a Python library and CLI tool to interface with Google Translate's text-to-speech API.
+
+You need to be online to communicate with Google servers.
+
+Learn more at https://github.com/pndurette/gTTS
+
 ### Festival
 
 Festival is a free software multi-lingual speech synthesis workbench that runs on multiple-platforms offering black box text to speech, as well as an open architecture for research in speech synthesis.

app.js

@@ -53,6 +53,8 @@ function getCmdWithArgs(fields) {
 
 	if (voice === 'google_speech') {
 		return getGoogleSpeechCmdWithArgs(fields);
+	} else if (voice === 'gtts') {
+		return getGttsCmdWithArgs(fields);
 	} else if (voice === 'festival') {
 		return getFestivalCmdWithArgs(fields);
 	} else if (voice === 'espeak') {
@@ -68,21 +70,31 @@ function getGoogleSpeechCmdWithArgs(fields) {
 		language = fields.language,
 		speed = fields.speed,
 
-		cmd = 'google_speech',
-		args = '-l ' + language + ' \"' + text + '\"' + ' -e overdrive 10 speed ' + speed;
+		cmd = 'google_speech' + ' -l ' + language + ' \"' + text + '\"' + ' -e overdrive 10 speed ' + speed;
 
-	return cmd + ' ' + args;
+	return cmd;
+}
+
+function getGttsCmdWithArgs(fields) {
+
+	var text = fields.textToSpeech,
+		language = fields.language,
+		speed = fields.speed,
+		speedParam = speed ? ' -s' : '',
+
+		cmd = 'gtts-cli' + ' -l ' + language + speedParam + ' --nocheck \"' + text + '\"' + ' | play -t mp3 -';
+
+	return cmd;
 }
 
 function getFestivalCmdWithArgs(fields) {
 
 	var text = fields.textToSpeech,
 		language = fields.language,
 
-		cmd = 'echo "' + text + '" | festival',
-		args = '--tts --heap 1000000 --language ' + language;
+		cmd = 'echo "' + text + '" | festival' + ' --tts --heap 1000000 --language ' + language;
 
-	return cmd + ' ' + args;
+	return cmd;
 }
 
 function getEspeakCmdWithArgs(fields) {
@@ -93,10 +105,9 @@ function getEspeakCmdWithArgs(fields) {
 		speed = Math.floor(fields.speed * 150),
 		pitch = '70',
 
-		cmd = 'espeak',
-		args = '-v' + language + voiceCode + ' -s ' + speed + ' -p ' + pitch + ' \"' + text + '\"';
+		cmd = 'espeak' + ' -v' + language + voiceCode + ' -s ' + speed + ' -p ' + pitch + ' \"' + text + '\"';
 
-	return cmd + ' ' + args;
+	return cmd;
 }
 
 function onSpeechDone(args, err, stdout, stderr) {

views/form.pug

@@ -31,6 +31,14 @@ html
 											checked
 										)
 										span GoogleSpeech
+								div.form-check-inline
+									label.form-check-label
+										input.form-check-input(
+											type='radio'
+											name='voice'
+											value='gtts'
+										)
+										span gTTS
 								div.form-check-inline
 									label.form-check-label
 										input.form-check-input(