voice: Add support for Google Translate's speech synthesizer

Uses the 'gtts-cli' command line client.  Supports a wide variety of
languages, including all "Complete" and "Good" Rockbox translations.

Additional changes:

 * voice synth script can accept pre-encoded mp3 files
 * Move language->synth options mapping into the voice script
 * Additional cleanups

Change-Id: I9523e2bca87cbcee2d8c4111f9892e8e458c7419

1 files changed, 25 insertions, 28 deletions

diff --git a/tools/configure b/tools/configure
index 585eadd357..aa8b190250 100755
--- a/tools/configure
+++ b/tools/configure
@@ -1111,23 +1111,7 @@ voiceconfig () {
     fi
     if [ -n "`findtool festival`" ]; then
         FESTIVAL="(F)estival "
-        case "$thislang" in
-            "italiano")
-            FESTIVAL_OPTS="--language italian"
-            ;;
-            "espanol")
-            FESTIVAL_OPTS="--language spanish"
-            ;;
-            "finnish")
-            FESTIVAL_OPTS="--language finnish"
-            ;;
-            "czech")
-            FESTIVAL_OPTS="--language czech"
-            ;;
-            *)
-            FESTIVAL_OPTS=""
-            ;;
-        esac
+        FESTIVAL_OPTS=""
         DEFAULT_TTS="festival"
         DEFAULT_TTS_OPTS=$FESTIVAL_OPTS
         DEFAULT_NOISEFLOOR="500"
@@ -1149,14 +1133,6 @@ voiceconfig () {
         DEFAULT_NOISEFLOOR="500"
         DEFAULT_CHOICE="w"
     fi
-    if [ -n "`findtool rbspeak`" ]; then
-        RBSPEAK="(O)ther "
-        RBSPEAK_OPTS=""
-        DEFAULT_TTS="rbspeak"
-        DEFAULT_TTS_OPTS=$RBSPEAK_OPTS
-        DEFAULT_NOISEFLOOR="500"
-        DEFAULT_CHOICE="O"
-    fi
     # Allow SAPI if Windows is in use
     if [ -n "`findtool winver`" ]; then
         SAPI="(S)API "
@@ -1164,10 +1140,26 @@ voiceconfig () {
         DEFAULT_TTS="sapi"
         DEFAULT_TTS_OPTS=$SAPI_OPTS
         DEFAULT_NOISEFLOOR="500"
-        DEFAULT_CHOICE="s"
+        DEFAULT_CHOICE="S"
+    fi
+    if [ -n "`findtool gtts-cli`" ]; then
+        GTTS="(g)tts "
+        GTTS_OPTS=""
+        DEFAULT_TTS="gtts"
+        DEFAULT_TTS_OPTS=$GTTS_OPTS
+        DEFAULT_NOISEFLOOR="500"
+        DEFAULT_CHOICE="g"
+    fi
+    if [ -n "`findtool rbspeak`" ]; then
+        RBSPEAK="(O)ther "
+        RBSPEAK_OPTS=""
+        DEFAULT_TTS="rbspeak"
+        DEFAULT_TTS_OPTS=$RBSPEAK_OPTS
+        DEFAULT_NOISEFLOOR="500"
+        DEFAULT_CHOICE="O"
     fi
 
-    if [ "$FESTIVAL" = "$FLITE" ] && [ "$FLITE" = "$ESPEAK" ] && [ "$ESPEAK" = "$SAPI" ] && [ "$SAPI" = "$MIMIC"] && [ "$MIMIC" = "$SWIFT" ] && [ "$SWIFT" = "$RBSPEAK" ]; then
+    if [ "$FESTIVAL" = "$FLITE" ] && [ "$FLITE" = "$ESPEAK" ] && [ "$ESPEAK" = "$SAPI" ] && [ "$SAPI" = "$MIMIC"] && [ "$MIMIC" = "$SWIFT" ] && [ "$SWIFT" = "$RBSPEAK" ] && [ "$RBSPEAK" = "$GTTS" ] ; then
         echo "You need Festival, eSpeak, Mimic, Flite, or rbspeak in your path, or SAPI available to build voice files"
         exit 3
     fi
@@ -1175,7 +1167,7 @@ voiceconfig () {
     if [ "$ARG_TTS" ]; then
         option=$ARG_TTS
     else
-        echo "TTS engine to use: ${FLITE}${FESTIVAL}${ESPEAK}${MIMIC}${SAPI}${SWIFT}${RBSPEAK}(${DEFAULT_CHOICE})?"
+        echo "TTS engine to use: ${FLITE}${FESTIVAL}${ESPEAK}${MIMIC}${SAPI}${SWIFT}${GTTS}${RBSPEAK}(${DEFAULT_CHOICE})?"
         option=`input`
         if [ -z "$option" ]; then option=${DEFAULT_CHOICE}; fi
         advopts="$advopts --tts=$option"
@@ -1211,6 +1203,11 @@ voiceconfig () {
         NOISEFLOOR="500"
         TTS_OPTS=$SWIFT_OPTS
 	;;
+	[Gg)
+        TTS_ENGINE="gtts"
+        NOISEFLOOR="500"
+        TTS_OPTS=$GTTS_OPTS
+	;;
 	[Oo])
         TTS_ENGINE="rbspeak"
         NOISEFLOOR="500"