2002-09-11 17:09:48 +00:00
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app_festival is an application that allows one to send text-to-speech commands
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to a background festival server, and to obtain the resulting waveform which
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gets sent down to the respective channel. app_festival also employs a waveform
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cache, so invariant text-to-speech strings ("Please press 1 for instructions")
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do not need to be dynamically generated all the time.
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You need :
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1) festival, patched to produce 8khz waveforms on output. Patch for Festival
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2003-01-08 19:45:43 +00:00
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1.4.2 RELEASE are included. The patch adds a new command to festival
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2002-09-11 17:09:48 +00:00
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(asterisk_tts).
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2004-12-01 21:10:28 +00:00
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It is possible to run Festival without patches in the source-code. Just
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add this to your /etc/festival.scm or /usr/share/festival/festival/scm:
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(define (tts_textasterisk string mode)
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"(tts_textasterisk STRING MODE)
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Apply tts to STRING. This function is specifically designed for
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use in server mode so a single function call may synthesize the string.
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This function name may be added to the server safe functions."
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(let ((wholeutt (utt.synth (eval (list 'Utterance 'Text string)))))
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(utt.wave.resample wholeutt 8000)
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(utt.wave.rescale wholeutt 5)
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(utt.send.wave.client wholeutt)))
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[See the comment with subject "Using Debian
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festival >= 1.4.3-15 (no recompiling needed!)" on
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http://www.voip-info.org/wiki-Asterisk+festival+installation for the
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original mentioning of it]
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2004-04-20 23:31:13 +00:00
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2) You may wish to obtain and install the asterisk-perl
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module by James Golovich <james@gnuinter.net>, from
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either CPAN, or his site: http://asterisk.gnuinter.net,
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as this contains a good example of how variable text
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can be tts'd via asterisk, namely the examples/tts-*.agi
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files there. It has been noted that the current expression
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evaluation capabilities of asterisk are not best suited
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for the generation and manipulation of text. AGI scripting
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can be ideal for these sorts of needs. For simpler usage,
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fixed, pre-recorded messages may be more amenable for your
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purposes.
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2002-09-11 17:09:48 +00:00
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3) Before running asterisk, you have to run festival-server with a command
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like :
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/usr/local/festival/bin/festival --server > /dev/null 2>&1 &
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