48 lines
2.0 KiB
Plaintext
48 lines
2.0 KiB
Plaintext
|
|
||
|
|
app_festival is an application that allows one to send text-to-speech commands
|
||
|
|
to a background festival server, and to obtain the resulting waveform which
|
||
|
|
gets sent down to the respective channel. app_festival also employs a waveform
|
||
|
|
cache, so invariant text-to-speech strings ("Please press 1 for instructions")
|
||
|
|
do not need to be dynamically generated all the time.
|
||
|
|
|
||
|
|
You need :
|
||
|
|
|
||
|
|
1) festival, patched to produce 8khz waveforms on output. Patch for Festival
|
||
|
|
1.4.2 RELEASE are included. The patch adds a new command to festival
|
||
|
|
(asterisk_tts).
|
||
|
|
|
||
|
|
It is possible to run Festival without patches in the source-code. Just
|
||
|
|
add this to your /etc/festival.scm or /usr/share/festival/festival/scm:
|
||
|
|
|
||
|
|
(define (tts_textasterisk string mode)
|
||
|
|
"(tts_textasterisk STRING MODE)
|
||
|
|
Apply tts to STRING. This function is specifically designed for
|
||
|
|
use in server mode so a single function call may synthesize the string.
|
||
|
|
This function name may be added to the server safe functions."
|
||
|
|
(let ((wholeutt (utt.synth (eval (list 'Utterance 'Text string)))))
|
||
|
|
(utt.wave.resample wholeutt 8000)
|
||
|
|
(utt.wave.rescale wholeutt 5)
|
||
|
|
(utt.send.wave.client wholeutt)))
|
||
|
|
|
||
|
|
[See the comment with subject "Using Debian
|
||
|
|
festival >= 1.4.3-15 (no recompiling needed!)" on
|
||
|
|
http://www.voip-info.org/wiki-Asterisk+festival+installation for the
|
||
|
|
original mentioning of it]
|
||
|
|
|
||
|
|
2) You may wish to obtain and install the asterisk-perl
|
||
|
|
module by James Golovich <james@gnuinter.net>, from
|
||
|
|
either CPAN, or his site: http://asterisk.gnuinter.net,
|
||
|
|
as this contains a good example of how variable text
|
||
|
|
can be tts'd via asterisk, namely the examples/tts-*.agi
|
||
|
|
files there. It has been noted that the current expression
|
||
|
|
evaluation capabilities of asterisk are not best suited
|
||
|
|
for the generation and manipulation of text. AGI scripting
|
||
|
|
can be ideal for these sorts of needs. For simpler usage,
|
||
|
|
fixed, pre-recorded messages may be more amenable for your
|
||
|
|
purposes.
|
||
|
|
|
||
|
|
3) Before running asterisk, you have to run festival-server with a command
|
||
|
|
like :
|
||
|
|
|
||
|
|
/usr/local/festival/bin/festival --server > /dev/null 2>&1 &
|