<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
</head>
<body style="background-color: #fff;">
<span style="display:none"> </span>
<!--~-|**|PrettyHtmlStartT|**|-~-->
<div id="ygrp-mlmsg" style="position:relative;">
<div id="ygrp-msg" style="z-index: 1;">
<!--~-|**|PrettyHtmlEndT|**|-~-->
<div id="ygrp-text" >
<p>DVD-T? Really? What kind of receiver just a usb ATSC tuner etc? Scary to<br>
what to think I could do with DVB-S2 and Gnuradio lol<br>
Ok great <br>
<br>
Back to the decoder – ff that fills in some blanks.<br>
<br>
I put a slicer ahead of the decoder - now I get segv inside the decoder -<br>
inside the general_work method:<br>
<br>
(running python under gdb...)<br>
<br>
[New Thread 0x7fffdc1bd700 (LWP 9511)]<br>
<br>
Program received signal SIGSEGV, Segmentation fault.<br>
[Switching to Thread 0x7fffdc9be700 (LWP 9510)]<br>
op25_decoder_bf::general_work (this=0x27666b0,<br>
nof_output_items=46,nof_input_items=..., input_items=<value optimized out>,<br>
output_items=...)<br>
at op25_decoder_bf.cc:92<br>
92 float *out = reinterpret_cast<float*>(output_items[0]);<br>
(gdb) bt<br>
#0 op25_decoder_bf::general_work (this=0x27666b0, nof_output_items=46,<br>
nof_input_items=..., input_items=<value optimized out>,<br>
output_items=...)<br>
at op25_decoder_bf.cc:92<br>
#1 0x00007ffff5f01a3e in gr_block_executor::run_one_iteration() ()<br>
from /usr/local/lib/libgnuradio-core-3.5.3git.so.0.0.0<br>
#2 0x00007ffff5f232cf in<br>
gr_tpb_thread_body::gr_tpb_thread_body(boost::shared_ptr<gr_block>, int) ()<br>
from /usr/local/lib/libgnuradio-core-3.5.3git.so.0.0.0<br>
#3 0x00007ffff5f1c71f in<br>
boost::detail::function::void_function_obj_invoker0<gruel::thread_body_wrapp<br>
er<tpb_container>, void>::invoke(boost::detail::function::function_buffer&)<br>
() from /usr/local/lib/libgnuradio-core-3.5.3git.so.0.0.0<br>
#4 0x00007ffff5c4d015 in boost::detail::thread_data<boost::function0<void><br>
>::run() () from /usr/local/lib/libgruel-3.5.3git.so.0.0.0<br>
#5 0x00007ffff5193b70 in thread_proxy ()<br>
from /usr/lib/libboost_thread.so.1.40.0<br>
#6 0x00007ffff7bc69ca in start_thread () from /lib/libpthread.so.0<br>
#7 0x00007ffff6aa0cdd in clone () from /lib/libc.so.6<br>
#8 0x0000000000000000 in ?? ()<br>
(gdb)<br>
<br>
The code in question looks like:<br>
<br>
int<br>
op25_decoder_bf::general_work(int nof_output_items, gr_vector_int&<br>
nof_input_ite<br>
ms, gr_vector_const_void_star& input_items, gr_vector_void_star&<br>
output_items)<br>
{<br>
...<br>
<br>
float *out = reinterpret_cast<float*>(output_items[0]);<br>
<br>
I'm not totally familiar with blocks in GNURadio - seems like output_items<br>
isn't initialized... <br>
<br>
Sean<br>
<br>
From: <a href="mailto:op25-dev%40yahoogroups.com">op25-dev@yahoogroups.com</a> [mailto:<a href="mailto:op25-dev%40yahoogroups.com">op25-dev@yahoogroups.com</a>] On Behalf<br>
Of Steve Glass<br>
Sent: Thursday, March 22, 2012 6:49 PM<br>
To: <a href="mailto:op25-dev%40yahoogroups.com">op25-dev@yahoogroups.com</a><br>
Subject: Re: [op25-dev] difference between op25.decoder_bf and<br>
op25.decoder_ff<br>
<br>
<br>
Hi,<br>
<br>
I've just got a funcube myself and just this morning support for it made it<br>
into the GNURadio trunk. That should make using them lots easier. I am<br>
looking forward to seeing the DVB-T support get done because that will make<br>
using SDR much cheaper (23USD delivered!).<br>
<br>
The question you ask concerns the interface to the decoder... the _ff<br>
version has float inputs and outputs and the other takes bytes (actually<br>
two-bit symbols) inputs and float outputs. The latter needs a slicer before<br>
it but that is conceptually the right thing to do and so the _ff version is<br>
deprecated. Hope that helps.<br>
<br>
Stevie<br>
<br>
On 23 March 2012 07:48, bdapriv01 <<a href="mailto:bdapriv01%40gmail.com">bdapriv01@gmail.com</a>> wrote:<br>
<br>
Hi<br>
<br>
Whats the difference between these 2? <br>
<br>
I'm new to Gnuradio & python to be honest; I'm writing my own ap25 listener<br>
for the funcube...<br>
<br>
So far, I've got my software tuning, FM decoding, and then sending data into<br>
the FSK4 decoder; I can see it fine tuning.. but I don't get anything out of<br>
the decoder_bf function.<br>
<br>
Is there any easy way, to debug what its doing?? <br>
<br>
Digging around in code there doesn't seem to be much debugging.<br>
<br>
I did create some network sinks, and forward the output of the FM demod to a<br>
a scope inside gnuradio companion.. the signal looks like FSK4 with the<br>
funky phase changes.<br>
<br>
Sean <br>
<br>
</p>
</div>
<!--~-|**|PrettyHtmlStart|**|-~-->
<div style="color: #fff; height: 0;">__._,_.___</div>
<div id="ygrp-actbar" style="clear: both; margin-bottom: 10px; white-space: nowrap; color: #666; padding-top: 15px;">
<div>
<a href="mailto:sean.watkins@gmail.com?subject=RE%3A%20%5Bop25-dev%5D%20difference%20between%20op25%2Edecoder_bf%20and%20op25%2Edecoder_ff" style="margin-right: 0; padding-right: 0;">
Reply to <span style="font-weight: 700;">sender</span></a> |
<a href="mailto:op25-dev@yahoogroups.com?subject=RE%3A%20%5Bop25-dev%5D%20difference%20between%20op25%2Edecoder_bf%20and%20op25%2Edecoder_ff">
Reply to <span style="font-weight: 700;">group</span></a> |
<a href="http://groups.yahoo.com/group/op25-dev/post;_ylc=X3oDMTJwcm1tbmJlBF9TAzk3MzU5NzE0BGdycElkAzIyMDg0NTgyBGdycHNwSWQDMTcwNTY0NDA4OQRtc2dJZAM2MjAEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMzMyNDc4MjAy?act=reply&messageNum=620">Reply <span style="font-weight: 700;">via web post</span></a> |
<a href="http://groups.yahoo.com/group/op25-dev/post;_ylc=X3oDMTJmZmRqam5uBF9TAzk3MzU5NzE0BGdycElkAzIyMDg0NTgyBGdycHNwSWQDMTcwNTY0NDA4OQRzZWMDZnRyBHNsawNudHBjBHN0aW1lAzEzMzI0NzgyMDI-" style="font-weight: 700;">Start a New Topic</a>
</div>
<a href="http://groups.yahoo.com/group/op25-dev/message/618;_ylc=X3oDMTMzdmcxYzBtBF9TAzk3MzU5NzE0BGdycElkAzIyMDg0NTgyBGdycHNwSWQDMTcwNTY0NDA4OQRtc2dJZAM2MjAEc2VjA2Z0cgRzbGsDdnRwYwRzdGltZQMxMzMyNDc4MjAyBHRwY0lkAzYxOA--">Messages in this topic</a>
(<span style="font-weight: 700;">3</span>)
</div>
<!------- Start Nav Bar ------>
<!-- |**|begin egp html banner|**| -->
<!-- |**|end egp html banner|**| -->
<!-- |**|begin egp html banner|**| -->
<div id="ygrp-vital" style="background-color: #e0ecee; font-family: Verdana; font-size: 10px; margin-bottom: 10px; padding: 10px;">
<span id="vithd" style="font-weight: bold; color: #333; text-transform: uppercase; ">Recent Activity:</span>
<ul style="list-style-type: none; margin: 0; padding: 0; display: inline;">
</ul>
<div style="clear: both; padding-top: 2px; color: #1e66ae;">
<a href="http://groups.yahoo.com/group/op25-dev;_ylc=X3oDMTJmYWQxbHRjBF9TAzk3MzU5NzE0BGdycElkAzIyMDg0NTgyBGdycHNwSWQDMTcwNTY0NDA4OQRzZWMDdnRsBHNsawN2Z2hwBHN0aW1lAzEzMzI0NzgyMDI-" style="text-decoration: none;">Visit Your Group</a>
</div>
</div>
<div id="ft" style="font-family: Arial; font-size: 11px; margin-top: 5px; padding: 0 2px 0 0; clear: both;">
<a href="http://groups.yahoo.com/;_ylc=X3oDMTJlYzcxbTAwBF9TAzk3MzU5NzE0BGdycElkAzIyMDg0NTgyBGdycHNwSWQDMTcwNTY0NDA4OQRzZWMDZnRyBHNsawNnZnAEc3RpbWUDMTMzMjQ3ODIwMg--" style="float: left;"><img src="http://l.yimg.com/a/i/us/yg/logo/us.gif" height="15" width="137" alt="Yahoo! Groups" style="border: 0;"/></a>
<div style="color: #747575; float: right;">Switch to: <a href="mailto:op25-dev-traditional@yahoogroups.com?subject=Change Delivery Format: Traditional" style="text-decoration: none;">Text-Only</a>, <a href="mailto:op25-dev-digest@yahoogroups.com?subject=Email Delivery: Digest" class="margin-rt" style="text-decoration: none;">Daily Digest</a> • <a href="mailto:op25-dev-unsubscribe@yahoogroups.com?subject=Unsubscribe" style="text-decoration: none;">Unsubscribe</a> • <a href="http://docs.yahoo.com/info/terms/" style="text-decoration: none;">Terms of Use</a></div>
</div>
<!-- |**|end egp html banner|**| -->
</div> <!-- ygrp-msg -->
<!-- Sponsor -->
<!-- |**|begin egp html banner|**| -->
<div id="ygrp-sponsor" style="width:160px; float:right; clear:none; margin:0 0 25px 0; background: #fff;">
<!-- Start Recommendations -->
<div id="ygrp-reco">
</div>
<!-- End Recommendations -->
</div> <!-- |**|end egp html banner|**| -->
<div style="clear:both; color: #FFF; font-size:1px;">.</div>
</div>
<img src="http://geo.yahoo.com/serv?s=97359714/grpId=22084582/grpspId=1705644089/msgId=620/stime=1332478202/nc1=4025338/nc2=3848643/nc3=4507179" width="1" height="1"> <br>
<div style="color: #fff; height: 0;">__,_._,___</div>
<!--~-|**|PrettyHtmlEnd|**|-~-->
</body>
<!--~-|**|PrettyHtmlStart|**|-~-->
<head>
<style type="text/css">
<!--
#ygrp-mkp {
border: 1px solid #d8d8d8;
font-family: Arial;
margin: 10px 0;
padding: 0 10px;
}
#ygrp-mkp hr {
border: 1px solid #d8d8d8;
}
#ygrp-mkp #hd {
color: #628c2a;
font-size: 85%;
font-weight: 700;
line-height: 122%;
margin: 10px 0;
}
#ygrp-mkp #ads {
margin-bottom: 10px;
}
#ygrp-mkp .ad {
padding: 0 0;
}
#ygrp-mkp .ad p {
margin: 0;
}
#ygrp-mkp .ad a {
color: #0000ff;
text-decoration: none;
}
#ygrp-sponsor #ygrp-lc {
font-family: Arial;
}
#ygrp-sponsor #ygrp-lc #hd {
margin: 10px 0px;
font-weight: 700;
font-size: 78%;
line-height: 122%;
}
#ygrp-sponsor #ygrp-lc .ad {
margin-bottom: 10px;
padding: 0 0;
}
a {
color: #1e66ae;
}
#actions {
font-family: Verdana;
font-size: 11px;
padding: 10px 0;
}
#activity {
background-color: #e0ecee;
float: left;
font-family: Verdana;
font-size: 10px;
padding: 10px;
}
#activity span {
font-weight: 700;
}
#activity span:first-child {
text-transform: uppercase;
}
#activity span a {
color: #5085b6;
text-decoration: none;
}
#activity span span {
color: #ff7900;
}
#activity span .underline {
text-decoration: underline;
}
.attach {
clear: both;
display: table;
font-family: Arial;
font-size: 12px;
padding: 10px 0;
width: 400px;
}
.attach div a {
text-decoration: none;
}
.attach img {
border: none;
padding-right: 5px;
}
.attach label {
display: block;
margin-bottom: 5px;
}
.attach label a {
text-decoration: none;
}
blockquote {
margin: 0 0 0 4px;
}
.bold {
font-family: Arial;
font-size: 13px;
font-weight: 700;
}
.bold a {
text-decoration: none;
}
dd.last p a {
font-family: Verdana;
font-weight: 700;
}
dd.last p span {
margin-right: 10px;
font-family: Verdana;
font-weight: 700;
}
dd.last p span.yshortcuts {
margin-right: 0;
}
div.attach-table div div a {
text-decoration: none;
}
div.attach-table {
width: 400px;
}
div.file-title a, div.file-title a:active, div.file-title a:hover, div.file-title a:visited {
text-decoration: none;
}
div.photo-title a, div.photo-title a:active, div.photo-title a:hover, div.photo-title a:visited {
text-decoration: none;
}
div#ygrp-mlmsg #ygrp-msg p a span.yshortcuts {
font-family: Verdana;
font-size: 10px;
font-weight: normal;
}
.green {
color: #628c2a;
}
.MsoNormal {
margin: 0 0 0 0;
}
o {
font-size: 0;
}
#photos div {
float: left;
width: 72px;
}
#photos div div {
border: 1px solid #666666;
height: 62px;
overflow: hidden;
width: 62px;
}
#photos div label {
color: #666666;
font-size: 10px;
overflow: hidden;
text-align: center;
white-space: nowrap;
width: 64px;
}
#reco-category {
font-size: 77%;
}
#reco-desc {
font-size: 77%;
}
.replbq {
margin: 4px;
}
#ygrp-actbar div a:first-child {
/* border-right: 0px solid #000;*/
margin-right: 2px;
padding-right: 5px;
}
#ygrp-mlmsg {
font-size: 13px;
font-family: Arial, helvetica,clean, sans-serif;
*font-size: small;
*font: x-small;
}
#ygrp-mlmsg table {
font-size: inherit;
font: 100%;
}
#ygrp-mlmsg select, input, textarea {
font: 99% Arial, Helvetica, clean, sans-serif;
}
#ygrp-mlmsg pre, code {
font:115% monospace;
*font-size:100%;
}
#ygrp-mlmsg * {
line-height: 1.22em;
}
#ygrp-mlmsg #logo {
padding-bottom: 10px;
}
#ygrp-mlmsg a {
color: #1E66AE;
}
#ygrp-msg p a {
font-family: Verdana;
}
#ygrp-msg p#attach-count span {
color: #1E66AE;
font-weight: 700;
}
#ygrp-reco #reco-head {
color: #ff7900;
font-weight: 700;
}
#ygrp-reco {
margin-bottom: 20px;
padding: 0px;
}
#ygrp-sponsor #ov li a {
font-size: 130%;
text-decoration: none;
}
#ygrp-sponsor #ov li {
font-size: 77%;
list-style-type: square;
padding: 6px 0;
}
#ygrp-sponsor #ov ul {
margin: 0;
padding: 0 0 0 8px;
}
#ygrp-text {
font-family: Georgia;
}
#ygrp-text p {
margin: 0 0 1em 0;
}
#ygrp-text tt {
font-size: 120%;
}
#ygrp-vital ul li:last-child {
border-right: none !important;
}
-->
</style>
</head>
<!--~-|**|PrettyHtmlEnd|**|-~-->
</html>
<!-- end group email -->