Memory Files and Wx

--001a11478e0421a764052e1db896
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Hello All:

Awhile back I was working on some wxPerl code to simulate an o-scope
display screen. While the original requirement that started me down that
path went away, I did get a proof of concept working that displayed several
waveforms and a four channel logic analyser(animated).

I have also been playing with the Gqrx software defined radio package and
developed a wxPerl based Gqrx scanner application plug-in. A request was
made on the Gqrx google group for a method to display the raw audio
waveform. It sounded like a good challenge. Gqrx outputs one channel of
16-bit, 48KHz audio to a UDP port. I have this working with a scrolling
audio waveform on the o-scope screen. I wonder, and it's hard to tell, if
the display is keeping up with the 48KHz data stream. Am I dropping packets?

Can I speed up the display process using a memory file rather than writing
to a disk file? Will Wx support this?

This is the current display and referesh code.

    # Create the Display(bmp & sbm) and Drawing(image) Objects
    #    Uses GD calls to draw the screen background and waveform on the
image object
    $self->{bmp} = Wx::Bitmap->new("rawaudio.png", wxBITMAP_TYPE_PNG);
    $self->{sbm} = Wx::StaticBitmap->new($self, wxID_ANY, $self->{bmp},
wxDefaultPosition, [600,600]);
    $oscope->{image} = GD::Image->new($oscope->{maxw}, $oscope->{maxh}) ||
die;

    # Read the updated image and refresh the display
    $self->{bmp} = Wx::Bitmap->new("rawaudio.png", wxBITMAP_TYPE_PNG);    #
Reload the screen image
    $self->{sbm}->SetBitmap($self->{bmp});                # Refresh screen

    # Save the Drawing Object to a disk file
    my $png_data = $oscope->{image}->png;                # Write image to a
file
    open OUTFILE, ">", "rawaudio.png" || die;
    binmode OUTFILE;
    print OUTFILE $png_data;
    close OUTFILE;

Can this code be modified to use a memory file? Syntax?

I am also considering moving the socket code into it's own thread to
isolate the reading and decoding of the UDP packets from the updating of
the display.

Thanks in advance,
James

--001a11478e0421a764052e1db896
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hello All:<br><br>Awhile back I was working on some wxPerl=
 code to simulate an o-scope display screen. While the original requirement=
 that started me down that path went away, I did get a proof of concept wor=
king that displayed several waveforms and a four channel logic analyser(ani=
mated).<br><br>I have also been playing with the Gqrx software defined radi=
o package and developed a wxPerl based Gqrx scanner application plug-in. A =
request was made on the Gqrx google group for a method to display the raw a=
udio waveform. It sounded like a good challenge. Gqrx outputs one channel o=
f 16-bit, 48KHz audio to a UDP port. I have this working with a scrolling a=
udio waveform on the o-scope screen. I wonder, and it&#39;s hard to tell, i=
f the display is keeping up with the 48KHz data stream. Am I dropping packe=
ts?<br><br>Can I speed up the display process using a memory file rather th=
an writing to a disk file? Will Wx support this?<br><br>This is the current=
 display and referesh code.<br><br>=C2=A0=C2=A0=C2=A0 # Create the Display(=
bmp &amp; sbm) and Drawing(image) Objects<br>=C2=A0=C2=A0=C2=A0 #=C2=A0=C2=
=A0=C2=A0 Uses GD calls to draw the screen background and waveform on the i=
mage object<br>=C2=A0=C2=A0=C2=A0 $self-&gt;{bmp} =3D Wx::Bitmap-&gt;new(&q=
uot;rawaudio.png&quot;, wxBITMAP_TYPE_PNG);<br>=C2=A0=C2=A0=C2=A0 $self-&gt=
;{sbm} =3D Wx::StaticBitmap-&gt;new($self, wxID_ANY, $self-&gt;{bmp}, wxDef=
aultPosition, [600,600]);<br>=C2=A0=C2=A0=C2=A0 $oscope-&gt;{image} =3D GD:=
:Image-&gt;new($oscope-&gt;{maxw}, $oscope-&gt;{maxh}) || die;<br><br>=C2=
=A0=C2=A0=C2=A0 # Read the updated image and refresh the display<br>=C2=A0=
=C2=A0=C2=A0 $self-&gt;{bmp} =3D Wx::Bitmap-&gt;new(&quot;rawaudio.png&quot=
;, wxBITMAP_TYPE_PNG);=C2=A0=C2=A0=C2=A0 # Reload the screen image<br>=C2=
=A0=C2=A0=C2=A0 $self-&gt;{sbm}-&gt;SetBitmap($self-&gt;{bmp});=C2=A0=C2=A0=
=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 # Refresh s=
creen<br><br>=C2=A0=C2=A0=C2=A0 # Save the Drawing Object to a disk file<br=
>=C2=A0=C2=A0=C2=A0 my $png_data =3D $oscope-&gt;{image}-&gt;png;=C2=A0=C2=
=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 # Write =
image to a file<br>=C2=A0=C2=A0=C2=A0 open OUTFILE, &quot;&gt;&quot;, &quot=
;rawaudio.png&quot; || die;<br>=C2=A0=C2=A0=C2=A0 binmode OUTFILE;<br>=C2=
=A0=C2=A0=C2=A0 print OUTFILE $png_data;<br>=C2=A0=C2=A0=C2=A0 close OUTFIL=
E;<br><br>Can this code be modified to use a memory file? Syntax?<br><br>I =
am also considering moving the socket code into it&#39;s own thread to isol=
ate the reading and decoding of the UDP packets from the updating of the di=
splay.<br><br>Thanks in advance,<br>James<br><br></div>

--001a11478e0421a764052e1db896--
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jmlynesjr
3/15/2016 10:14:21 PM
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