Question about streaming on Ruby

Rob · Rob

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I have a problem which I even don't know where to start.
My professor asked me to build a system in Ruby which uses streaming in
order to play voice.
It is a system where the server will give responses to what the user says.
So, basically if the user says "hello", the system will reply saying "Fine,
and you?".
At the moment I don't have to care about the voice recognition, I just have
to
build something that can save a sound file in the server and something where
the user can
press a button called "record my voice" and that as soon as the server
finishes recording the
user's voice, the server will play the response file.

My question is: how to start doing this with Ruby?
Can Ruby do this?

I asked my friends at my lab, and one friend said I should better forget
Ruby and use active-X.
But my professor said I should try to develop it using Ruby.

Rob

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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>I have a problem which I even =
don't know=20
where to start.</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>My professor asked me to build =
a system in=20
Ruby which uses streaming in order to play voice.</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>It is a system where the =
server will give=20
responses to what the user says.</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>So, basically if the user says =
"hello",=20
the system will reply saying "Fine, and you?".</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>At the moment I don't have to =
care about=20
the voice recognition, I just have to</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>build something that can save =
a sound file=20
in the server and something where the user can</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>press a button called "record =
my voice"=20
and that as soon as the server finishes recording the</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>user's voice, the server will =
play the=20
response file.</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2></FONT> </DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>My question is: how to start =
doing this=20
with Ruby?</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>Can Ruby do this?</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2></FONT> </DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>I asked my friends at my lab, =
and one=20
friend said I should better forget Ruby and use active-X.</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>But my professor said I should =
try to=20
develop it using Ruby.</FONT></DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2></FONT> </DIV>
<DIV><FONT face=3D"MS UI Gothic" size=3D2>Rob</FONT></DIV></BODY></HTML>

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Laurent Sansonetti · Laurent Sansonetti

Hello Rob,

Rob wrote:
<snip>

> My question is: how to start doing this with Ruby?
> Can Ruby do this?
>

Yes! In fact, GStreamer is probably able to do this, and you can call
GStreamer via Ruby using Ruby-GStreamer.

I never tried this, but I think you could record audio from the
microphone using the osssrc element from the ossaudio plugin.

You will find more information about GStreamer on its homepage:

[url]http://www.gstreamer.net[/url]

And for Ruby bindings:

[url]http://www.freesoftware.fsf.org/ruby-gst[/url]

Current API (CVS):

[url]http://lrz.samika.net/ruby-gst/api/index.html[/url]

Ruby-GStreamer 0.1.1 will be released in a few days, featuring a lot of
improvements.

Cheers,

--
Laurent

Robert Klemme · Robert Klemme

"Rob" <robson@magario.com> schrieb im Newsbeitrag
news:064801c34081$3c812000$a8c70b85@CPQ22906761423 ...

> I have a problem which I even don't know where to start.
> My professor asked me to build a system in Ruby which uses streaming in
> order to play voice.
> It is a system where the server will give responses to what the user

says.

> So, basically if the user says "hello", the system will reply saying

"Fine,

> and you?".
> At the moment I don't have to care about the voice recognition, I just

have

> to
> build something that can save a sound file in the server and something

where

> the user can
> press a button called "record my voice" and that as soon as the server
> finishes recording the
> user's voice, the server will play the response file.
>
> My question is: how to start doing this with Ruby?
> Can Ruby do this?
>
> I asked my friends at my lab, and one friend said I should better forget
> Ruby and use active-X.
> But my professor said I should try to develop it using Ruby.

Apart from the sound recognition stuff this sounds like an ordinary web
application. You can have a look at eruby and I think there's an Apache
mod_ruby.

The difficult part - independent of programming language used - will be
the sound recording of the user's voice.

robert

Laurent Sansonetti · Laurent Sansonetti

I forgot to mention that GStreamer is *only* available on POSIX
operating systems, such as GNU/Linux and FreeBSD for instance.

[url]http://gstreamer.net/status/?category=7[/url]

--
Laurent

Armin Roehrl · Armin Roehrl

What you want todo is very easy todo in Squeak.
[url]http://www.squeak.org/[/url]

Ciao,
-A

Brian Candler · Brian Candler

On Wed, Jul 02, 2003 at 07:03:57PM +0900, Rob wrote:

> press a button called "record my voice" and that as soon as the server
> finishes recording the
>
> user's voice, the server will play the response file.
>
>
>
> My question is: how to start doing this with Ruby?
>
> Can Ruby do this?

Sure, at worst something like:

system("wavrec -r 5 myfile.wav")

Or I guess you could even open /dev/audio or /dev/dsp and read/write from
them directly.

Cheers,

Brian.

Bill Kelly · Bill Kelly

Hi,

"Rob" <robson@magario.com> wrote:

> At the moment I don't have to care about the voice recognition, I just have to
> build something that can save a sound file in the server and something where
> the user can press a button called "record my voice" and that as soon as the
> server finishes recording the user's voice, the server will play the response file.
>
> My question is: how to start doing this with Ruby?
> Can Ruby do this?
>
> I asked my friends at my lab, and one friend said I should better forget
> Ruby and use active-X.
> But my professor said I should try to develop it using Ruby.

Since you mention active-X I'm assuming you might be under Windows.

Here's a way to Play sounds in Ruby under Windows:
[url]http://www.ruby-talk.com/55423[/url]

As for recording... I haven't recorded under Windows, but there's a high-level
API available for recording, that we should be able to call from Ruby.

This page has examples using Windows' winmm.dll MCISendString function to
both play and record sounds. The examples are in VB, but translate easily
to Ruby using Ruby's Win32API module.
[url]http://www.geocities.com/smigman.geo/mci/wav.html[/url]
(Hmm.. the page seems to be down at the moment... but it's still in Google's
cache. If you search for "MCISendString record" [without the quotes] in
Google, this site should come up as one of the first hits, called "Visual
Basic WAV"... then click on the 'Cached' link :)

Here's a Ruby example using MCISendString to play a sound:

require 'Win32API'
MCISendString = Win32API.new("winmm", "mciSendString", ['P', 'P', 'L', 'L'], 'L')

MCISendString.call('open m:\download\snd\columbus.wav type waveaudio alias voice1', nil, 0, 0)
MCISendString.call('play voice1', nil, 0, 0)

...I've tried the above on my system and it worked.

I haven't tried the following, but the command lines are translated from
the above web page:

# prepare to record in buffer called "capture"
MCISendString("open new type waveaudio alias capture", nil, 0, 0)

# set bits-per-sample to 8 or 16
MCISendString("set capture bitspersample 8", nil, 0, 0)

# set sample rate (11025, 22050, or 44100)
MCISendString("set capture samplespersec 11025", nil, 0, 0)

# set mono or stereo (1 or 2 channels)
MCISendString("set capture channels 1", nil, 0, 0)

# apparently this will record until the user presses "stop"
MCISendString("record capture", nil, 0, 0)

# alternately it seems you can specify a range in the buffer
# in which to record:
MCISendString("record capture from 2000 to 4000", nil, 0, 0)
# ...so presumably this would allow you to record for a few
# seconds and stop automatically without the user having to
# click anything.

# finally to save the buffer to a file:
MCISendString("save capture c:\NewWave.wav", nil, 0, 0)

.....Hmmm.... In your case, if you really need to do streaming,
a lower-level API would probably be needed. Are you saying you'd
need to record a sound (what the user speaks) locally, stream that
to the server, have the server do (eventual) voice recognition, and
respond with an audio stream back to the user?

Since the phrases spoken are probably short, I wonder if you might
be able to just use a non-streamed API like MCISendString? And then
just transmit the recorded audio file to the server?

If you really need streaming, you might want to look into this
lower-level WAV API:
[url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/mmfunc_1q5q.asp[/url]

Here's some info on caling waveInOpen() from VB, which should
be easy to translate to Ruby's Win32API like the MCISendString
stuff above..
[url]http://www.mentalis.org/apilist/waveInOpen.shtml[/url]

Hope this helps,

Bill

Rob · Rob

Hi, Bill.

Thanks a lot for the hints.
I am under Windows, but the problem is that my professor wants this
application to be compatible
with any kinds of servers (windows and linux).
I was thinking that this application is similar to Yahoo voice chat, since
it deals with streaming.
But Yahoo voice chat also needs Windows to run.
Is that possible to make an application for this which runs in both windows,
mac and linux and
can be accessed from a browser like microsoft internet explorer, mozilla or
netscape?

Rob

----- Original Message -----
From: "Bill Kelly" <billk@cts.com>
To: "ruby-talk ML" <ruby-talk@ruby-lang.org>
Sent: Wednesday, July 02, 2003 11:01 PM
Subject: Re: Question about streaming on Ruby

> Hi,
>
> "Rob" <robson@magario.com> wrote:

> > At the moment I don't have to care about the voice recognition, I just

have to

> > build something that can save a sound file in the server and something

where

> > the user can press a button called "record my voice" and that as soon as

the

> > server finishes recording the user's voice, the server will play the

response file.

> >
> > My question is: how to start doing this with Ruby?
> > Can Ruby do this?
> >
> > I asked my friends at my lab, and one friend said I should better forget
> > Ruby and use active-X.
> > But my professor said I should try to develop it using Ruby.

>
> Since you mention active-X I'm assuming you might be under Windows.
>
> Here's a way to Play sounds in Ruby under Windows:
> [url]http://www.ruby-talk.com/55423[/url]
>
> As for recording... I haven't recorded under Windows, but there's a

high-level

> API available for recording, that we should be able to call from Ruby.
>
> This page has examples using Windows' winmm.dll MCISendString function to
> both play and record sounds. The examples are in VB, but translate easily
> to Ruby using Ruby's Win32API module.
> [url]http://www.geocities.com/smigman.geo/mci/wav.html[/url]
> (Hmm.. the page seems to be down at the moment... but it's still in

Google's

> cache. If you search for "MCISendString record" [without the quotes] in
> Google, this site should come up as one of the first hits, called "Visual
> Basic WAV"... then click on the 'Cached' link :)
>
> Here's a Ruby example using MCISendString to play a sound:
>
> require 'Win32API'
> MCISendString = Win32API.new("winmm", "mciSendString", ['P', 'P', 'L',

'L'], 'L')

>
> MCISendString.call('open m:\download\snd\columbus.wav type waveaudio alias

voice1', nil, 0, 0)

> MCISendString.call('play voice1', nil, 0, 0)
>
> ...I've tried the above on my system and it worked.
>
> I haven't tried the following, but the command lines are translated from
> the above web page:
>
> # prepare to record in buffer called "capture"
> MCISendString("open new type waveaudio alias capture", nil, 0, 0)
>
> # set bits-per-sample to 8 or 16
> MCISendString("set capture bitspersample 8", nil, 0, 0)
>
> # set sample rate (11025, 22050, or 44100)
> MCISendString("set capture samplespersec 11025", nil, 0, 0)
>
> # set mono or stereo (1 or 2 channels)
> MCISendString("set capture channels 1", nil, 0, 0)
>
> # apparently this will record until the user presses "stop"
> MCISendString("record capture", nil, 0, 0)
>
> # alternately it seems you can specify a range in the buffer
> # in which to record:
> MCISendString("record capture from 2000 to 4000", nil, 0, 0)
> # ...so presumably this would allow you to record for a few
> # seconds and stop automatically without the user having to
> # click anything.
>
> # finally to save the buffer to a file:
> MCISendString("save capture c:\NewWave.wav", nil, 0, 0)
>
>
>
> .....Hmmm.... In your case, if you really need to do streaming,
> a lower-level API would probably be needed. Are you saying you'd
> need to record a sound (what the user speaks) locally, stream that
> to the server, have the server do (eventual) voice recognition, and
> respond with an audio stream back to the user?
>
> Since the phrases spoken are probably short, I wonder if you might
> be able to just use a non-streamed API like MCISendString? And then
> just transmit the recorded audio file to the server?
>
> If you really need streaming, you might want to look into this
> lower-level WAV API:
>

[url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/mmfunc_1q5q.asp[/url]

>
> Here's some info on caling waveInOpen() from VB, which should
> be easy to translate to Ruby's Win32API like the MCISendString
> stuff above..
> [url]http://www.mentalis.org/apilist/waveInOpen.shtml[/url]
>
>
>
> Hope this helps,
>
> Bill
>
>
>
>

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