Re: [Vala] Fwd: Porting "Using PocketSphinx with GStreamer and python" to Vala

From: Brian Duffy <brduffy gmail com>
To: JM <interflug1 gmx net>
Cc: vala-list <vala-list gnome org>, gstreamer-devel lists freedesktop org
Subject: Re: [Vala] Fwd: Porting "Using PocketSphinx with GStreamer and python" to Vala
Date: Fri, 23 Mar 2012 15:05:47 -0400

Hi JM,

I ran your code on my Fedora 16 box and I ran into a segfault but after
looking at the code and noticing a few things you did differently than me I
narrowed down the issue to the asr_partial_result and asr_result functions.
Specifically, the segfault was coming when trying to set the value for
"uttid" with gststruct.set_value("uttid", uttid);. I changed the parameter
type for uttid in the method definition to string instead of GLib.Value and
bingo it worked. Then I added my language model and dictionary to the code
in the init_gst method and PocketSphinx is now printing out my limited
language definition when I speak it!  That was a huge help to me! Thanks a
lot. Are you the original author of the tutorial? It would be great if we
could add this Vala port to the article so that people can take advantage
of it easily. Do you have the contacts to get that done or should I try?

I'm attaching the code with my small changes, including 1)adding the
language model and dictionary 2)changing the parameter types for uttid and
3) my revised pipeline definition which shows how I got gstreamer to
recognize my usb microphone using the device keyword. If you have access to
edit the article then I think it is worth mentioning the lmtool
<http://www.speech.cs.cmu.edu/tools/lmtool-new.html>from CMU which
makes it really easy to define a language model and
dictionary and include them with your code.

Regards

Brian

On Thu, Mar 22, 2012 at 6:39 PM, JM <interflug1 gmx net> wrote:

Hello Brian
I tried porting that python example to vala (attached file) and it
doesn't work here (Fails at runtime during asr.set_property("configured",
true) ).
Your version crashes at the same point here.

I'm on ubuntu 11.10

I tested the pipeline with
gst-launch fakesrc ! audioconvert ! audioresample ! vader name=vad
auto-threshold=true ! pocketsphinx name=asr ! fakesink
and it fails with 'SIGSEGV accessing address 0x2c' as soon as it is
(automatically)set to PAUSED.
Funny thing is that the python example seems to work. Just had a look at
the console. I didn't do further tests because my computer lacks a
microphone.
Your code looks fine, so far. On my machine I just don't get to the point
where you have the issues.
Regards


Am Mittwoch, den 21.03.2012, 22:01 -0400 schrieb Brian Duffy:

Just speaking the words that are defined in my language model and
dictionary. I think my problem is more severe than the words I am

choosing

to speak. Besides, if PocketSphinx segfaults just because you say hmmm

then

I am wasting my time.

On Wed, Mar 21, 2012 at 6:40 PM, JM <interflug1 gmx net> wrote:

What exactly are you speaking into the microphone?
Saying "null" or "hmm" may lead to segfauls ;)


Am Mittwoch, den 21.03.2012, 14:38 -0400 schrieb Brian Duffy:

Sorry, forgot to mention that the segfault happens when I speak into

the

microphone; so my pipeline and asr are working well enough to pick up
utterances from my microphone.



---------- Forwarded message ----------
From: Brian Duffy <brduffy gmail com>
Date: Wed, Mar 21, 2012 at 2:30 PM
Subject: Porting "Using PocketSphinx with GStreamer and python" to

Vala

To: vala-list <vala-list gnome org>,
clutter-app-devel-list clutter-project org


Hello all, I am trying to port
<http://goog_1501870203>this<

http://cmusphinx.sourceforge.net/wiki/gstreamer>example

"Using PocketSphinx with GStreamer and Python" to Vala. I have an
example compiling but I am getting some warnings that I don't

understand

and a segmentation fault when running. Also, I am not sure what data

types

I should be using for the "text" and "uttid" params in the asrResult

asrPartialResult, partialResult and finalResult methods. My

environment

is

Fedora 16. PocketSphinx .7, latest gstreamer that comes with Fedora

16. I

am using Clutter (1.8) for the main loop because my application UI

will

ultimately be written in Clutter. Any help would be greatly

appreciated.

Here are my compile warnings and code .... thanks.

[brian duffybr2foodie]$

valac -X -O2 -g --pkg clutter-1.0 --pkg gstreamer-0.10 --pkg
gstreamer-interfaces-0.10 --pkg clutter-gst-1.0 cmu.vala
cmu.vala:25.24-25.48: warning: unhandled error `GLib.Error' pipeline

(Pipeline)Gst.parse_launch(pipeDef); ^^^^^^^^^^^^^^^^^^^^^^^^^
cmu.vala:11.2-11.26: warning: field `Sphinx.vader' never used private
Gst.Element vader; ^^^^^^^^^^^^^^^^^^^^^^^^^ cmu.vala:112.6-112.26:
warning: local variable `sphinx' declared but never used var sphinx

= new

Sphinx(); ^^^^^^^^^^^^^^^^^^^^^

/home/brian/BitBucketRepos/foodie/cmu.vala:

In function ‘sphinx_asrPartialResult’:
/home/brian/BitBucketRepos/foodie/cmu.vala:51:2: warning: passing

argument

1 of ‘gst_structure_set_value’ discards ‘const’ qualifier from

pointer

target type [enabled by default]
/usr/include/gstreamer-0.10/gst/gststructure.h:117:25: note: expected
‘struct GstStructure *’ but argument is of type ‘const struct

GstStructure

*’ /home/brian/BitBucketRepos/foodie/cmu.vala:52:2: warning: passing
argument 1 of ‘gst_structure_set_value’ discards ‘const’ qualifier

from

pointer target type [enabled by default]
/usr/include/gstreamer-0.10/gst/gststructure.h:117:25: note: expected
‘struct GstStructure *’ but argument is of type ‘const struct

GstStructure

*’ /home/brian/BitBucketRepos/foodie/cmu.vala:54:2: warning: passing
argument 1 of ‘_gst_structure_copy0’ discards ‘const’ qualifier from
pointer target type [enabled by default] cmu.vala.c:287:17: note:

expected

‘gpointer’ but argument is of type ‘const struct GstStructure *’
/home/brian/BitBucketRepos/foodie/cmu.vala: In function

‘sphinx_asrResult’:

/home/brian/BitBucketRepos/foodie/cmu.vala:65:2: warning: passing

argument

1 of ‘gst_structure_set_value’ discards ‘const’ qualifier from

pointer

target type [enabled by default]
/usr/include/gstreamer-0.10/gst/gststructure.h:117:25: note: expected
‘struct GstStructure *’ but argument is of type ‘const struct

GstStructure

*’ /home/brian/BitBucketRepos/foodie/cmu.vala:66:2: warning: passing
argument 1 of ‘gst_structure_set_value’ discards ‘const’ qualifier

from

pointer target type [enabled by default]
/usr/include/gstreamer-0.10/gst/gststructure.h:117:25: note: expected
‘struct GstStructure *’ but argument is of type ‘const struct

GstStructure

*’ /home/brian/BitBucketRepos/foodie/cmu.vala:68:2: warning: passing
argument 1 of ‘_gst_structure_copy0’ discards ‘const’ qualifier from
pointer target type [enabled by default] cmu.vala.c:287:17: note:

expected

‘gpointer’ but argument is of type ‘const struct GstStructure *’
/home/brian/BitBucketRepos/foodie/cmu.vala: In function
‘sphinx_app_message’:

/home/brian/BitBucketRepos/foodie/cmu.vala:77:2:

warning: passing argument 1 of ‘_gst_structure_copy0’ discards

‘const’

qualifier from pointer target type [enabled by default]

cmu.vala.c:287:17:

note: expected ‘gpointer’ but argument is of type ‘const struct
GstStructure *’ cmu.vala.c: In function ‘_vala_main’:
/home/brian/BitBucketRepos/foodie/cmu.vala:107:15: warning: ignoring

return

value of ‘clutter_init’, declared with attribute warn_unused_result
[-Wunused-result] Compilation succeeded - 3 warning(s)




[code]
using Clutter;
using ClutterGst;
using Gst;


class Sphinx : GLib.Object {


// experimenting with gstreamer pocketsphinx
private Gst.Pipeline pipeline;
 private Gst.Element vader;
dynamic Gst.Element asr;
private Gst.Bus bus;
 private Gst.Structure msg;
private Gst.Structure my_struct;

 public Sphinx() {


string a = """pulsesrc
device="alsa_input.usb-AKM_AK5370-00-AK5370.analog-mono" !

audioconvert

!""";
 string b = """ audioresample ! vader name=vad auto-threshold=true !
pocketsphinx name=asr ! fakesink""";


string pipeDef = a + b;
pipeline = (Pipeline)Gst.parse_launch(pipeDef);

asr = pipeline.get_by_name("asr");

asr.set_property("lm", "4038.lm");
        asr.set_property("dict", "4038.dic");

asr.partial_result.connect(asrPartialResult);
asr.result.connect(asrResult);

asr.set_property("configured", true);

bus = pipeline.get_bus();
        bus.add_signal_watch();
bus.message.connect(app_message);

pipeline.set_state(Gst.State.PLAYING);

}


private void asrPartialResult(Gst.Element asr, GLib.Value text,

GLib.Value

uttid) {
         my_struct = new Gst.Structure.empty("partial_result");

        my_struct.set_value("hyp", text);
        my_struct.set_value("uttid", uttid);

        asr.post_message(new Gst.Message.application(asr,

my_struct));

 }


private void asrResult(Gst.Element asr, GLib.Value text, GLib.Value

uttid) {


stdout.printf("%s", "inside asrResult");
         my_struct = new Gst.Structure.empty("result");

        my_struct.set_value("hyp", text);
        my_struct.set_value("uttid", uttid);

        asr.post_message(new Gst.Message.application(asr,

my_struct));

 }


private void app_message(Gst.Bus bus, Gst.Message p_msg) {

 //stdout.printf("%s", "inside app_message");
msg = p_msg.get_structure();
 string msgType = msg.get_name();

if (msgType == "partial_result") {
 partialResult(msg["hyp"], msg["uttid"]);
}else if (msgType == "result") {
 finalResult(msg["hyp"], msg["uttid"]);
pipeline.set_state(Gst.State.PAUSED);
 }
  }

private void partialResult(GLib.Value hyp, GLib.Value uttid) {

stdout.printf("%s", (string)hyp);
}

 private void finalResult(GLib.Value hyp, GLib.Value uttid) {
stdout.printf("%s", (string)hyp);
 }


}


int main (string[] args) {

Clutter.init(ref args);
 Gst.init(ref args);

//ClutterGst.init(ref args);

 var sphinx = new Sphinx();

Clutter.main();

return 0;
}
[/code]
--
Duff



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-- 
Duff

Attachment: sphinx.vala
Description: Text Data

References:
- [Vala] Porting "Using PocketSphinx with GStreamer and python" to Vala
  - From: Brian Duffy
- [Vala] Fwd: Porting "Using PocketSphinx with GStreamer and python" to Vala
  - From: Brian Duffy
- Re: [Vala] Fwd: Porting "Using PocketSphinx with GStreamer and python" to Vala
  - From: JM
- Re: [Vala] Fwd: Porting "Using PocketSphinx with GStreamer and python" to Vala
  - From: Brian Duffy

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