#!/bin/sh
##############################################################
#             watalk.sh                                      #
# Bash script to generate and keep TTS soundfiles            #
# to be used by Asterisk extensions                          #
# generated by IBM Watson Text to Speach API                 #
#                                                            #
# from Arne Groh 07/2022                                     #
#                                                            #
# sample:                                                    #
# exten => 1234,1,Answer()                                   #
#  same => n,System(/usr/local/bin/watalk.sh "Guten Morgen.")#
#  same => n,Playback(/tmp/sprech)                           #
#  same => n,Hangup()                                        #
#                                                            #
# installation:                                              #
# format_mp3.so  has to be loaded in Asterisk                #
# put this script in your /usr/local/bin/        directory   #
# make it executable:                                        #
# sudo chmod +x /usr/local/bin/watalk.sh                     #
# give to Asterisk:                                          #
# sudo chown asterisk:asterisk /usr/local/bin/watalk.sh      #
#                                                            #
##############################################################

# Set your IBM Cloud credentials
apikey=abcdefghabcdefg_123456789098765432123456-a_B
url=https://api.eu-de.text-to-speech.watson.cloud.ibm.com/instances/98765433-abcd-efab-abcd-1234567890ab

# Set the voice
voice=de-DE_BirgitV3Voice
# voice=de-DE_DieterV3Voice

# Set tuning
rate="-10%"
pitch="150Hz"

# Soundfile to be played by Asterisk exten
wavfile=/tmp/sprech.mp3

# Folder where generated sound files will be stored
storedir=/var/lib/asterisk/sounds/tts

text=$1 # First argument
name=$(echo $text|md5sum|cut -d" " -f1).mp3
storefile=$storedir/$name
apikey=apikey:$apikey
url=$url/v1/synthesize?voice=$voice
rate=\'$rate\'
pitch=\'$pitch\'

if [ ! -f $storefile ]
then
        curl -X POST -u ${apikey} \
        --header "Content-Type: application/json" \
        --header "Accept: audio/mp3" \
        --data "{\"text\":\"<prosody rate=${rate} pitch=${pitch}>${text}</prosody>\"}" \
        --output ${storefile} \
        "${url}"
fi
rm -f $wavfile
cp $storefile $wavfile
exit