simple portable text to speech using ffmpeg or ffplay

say.sh

#!/bin/sh
# usage: say hello                        # plays audio (ffplay)
#        OUTPUT=/tmp/hello.wav say hello  # saves wav (ffmpeg)

dbus_session_file=~/.dbus/session-bus/$(cat /var/lib/dbus/machine-id)-0
if [ -e "$dbus_session_file" ]; then
  . "$dbus_session_file"
  export DBUS_SESSION_BUS_ADDRESS DBUS_SESSION_BUS_PID
fi

# set environment when run in cron on xfce4
{ which xfce4-session && eval "export $(egrep -z DBUS_SESSION_BUS_ADDRESS /proc/$(pgrep -u $LOGNAME xfce4-session)/environ)"; } &>/dev/null

voice=slt
opts="-autoexit -nodisp"
cmd=ffplay
test -z $OUTPUT || { cmd=ffmpeg; opts=""; }
echo "[.] voices: $( ffplay -f lavfi -i flite=list_voices=true 2>&1 | grep _flite | sed 's/.*\]/   /g' | awk '{ printf($0)", " }' )"
${cmd} ${opts} -f lavfi -i flite=text="'$*'":v=$voice -af "flanger,haas=left_delay=20,crystalizer" $OUTPUT