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<p>Network identification example.</p>
<div class="fragment"><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * libzvbi network identification example</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * Copyright (C) 2006 Michael H. Schimek</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div><div class="line"><span class="comment"> * modification, are permitted provided that the following conditions</span></div><div class="line"><span class="comment"> * are met:</span></div><div class="line"><span class="comment"> * 1. Redistributions of source code must retain the above copyright</span></div><div class="line"><span class="comment"> * notice, this list of conditions and the following disclaimer.</span></div><div class="line"><span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span></div><div class="line"><span class="comment"> * notice, this list of conditions and the following disclaimer in</span></div><div class="line"><span class="comment"> * the documentation and/or other materials provided with the</span></div><div class="line"><span class="comment"> * distribution.</span></div><div class="line"><span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div><div class="line"><span class="comment"> * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div><div class="line"><span class="comment"> * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span></div><div class="line"><span class="comment"> * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span></div><div class="line"><span class="comment"> * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span></div><div class="line"><span class="comment"> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span></div><div class="line"><span class="comment"> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span></div><div class="line"><span class="comment"> * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span></div><div class="line"><span class="comment"> * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span></div><div class="line"><span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span></div><div class="line"><span class="comment"> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"></div><div class="line"><span class="comment">/* $Id: network.c,v 1.7 2009/03/23 01:30:22 mschimek Exp $ */</span></div><div class="line"></div><div class="line"><span class="comment">/* This example shows how to identify a network from data transmitted</span></div><div class="line"><span class="comment"> in XDS packets, Teletext packet 8/30 format 1 and 2, and VPS packets.</span></div><div class="line"><span class="comment"></span></div><div class="line"><span class="comment"> gcc -o network network.c `pkg-config zvbi-0.2 --cflags --libs` */</span></div><div class="line"></div><div class="line"><span class="preprocessor">#undef NDEBUG</span></div><div class="line"><span class="preprocessor">#include <assert.h></span></div><div class="line"><span class="preprocessor">#include <stdio.h></span></div><div class="line"><span class="preprocessor">#include <stdlib.h></span></div><div class="line"><span class="preprocessor">#include <string.h></span></div><div class="line"><span class="preprocessor">#include <locale.h></span></div><div class="line"><span class="preprocessor">#include <errno.h></span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <libzvbi.h></span></div><div class="line"></div><div class="line"><span class="keyword">static</span> <a name="_a0"></a><a class="code" href="structvbi__capture.html">vbi_capture</a> * cap;</div><div class="line"><span class="keyword">static</span> <a name="_a1"></a><a class="code" href="structvbi__decoder.html">vbi_decoder</a> * dec;</div><div class="line"><span class="keyword">static</span> vbi_bool quit;</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> services;</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span></div><div class="line">handler (<a name="_a2"></a><a class="code" href="structvbi__event.html">vbi_event</a> * ev,</div><div class="line"> <span class="keywordtype">void</span> * user_data)</div><div class="line">{</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *event_name;</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *network_name;</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *call_sign;</div><div class="line"> <span class="keywordtype">char</span> *locale_network_name;</div><div class="line"></div><div class="line"> user_data = user_data; <span class="comment">/* unused */</span></div><div class="line"></div><div class="line"> <span class="comment">/* VBI_EVENT_NETWORK_ID is always sent when the decoder</span></div><div class="line"><span class="comment"> receives a CNI. VBI_EVENT_NETWORK only if it can</span></div><div class="line"><span class="comment"> determine a network name. */</span></div><div class="line"></div><div class="line"> <span class="keywordflow">switch</span> (ev-><a name="a3"></a>type) {</div><div class="line"> <span class="keywordflow">case</span> VBI_EVENT_NETWORK:</div><div class="line"> event_name = <span class="stringliteral">"VBI_EVENT_NETWORK"</span>;</div><div class="line"> quit = TRUE;</div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"></div><div class="line"> <span class="keywordflow">case</span> VBI_EVENT_NETWORK_ID:</div><div class="line"> event_name = <span class="stringliteral">"VBI_EVENT_NETWORK_ID"</span>;</div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"></div><div class="line"> <span class="keywordflow">default</span>:</div><div class="line"> assert (0);</div><div class="line"> }</div><div class="line"></div><div class="line"> network_name = <span class="stringliteral">"unknown"</span>;</div><div class="line"> <span class="keywordflow">if</span> (0 != ev-><a name="a4"></a>ev.<a name="a5"></a>network.<a name="a6"></a><a class="code" href="structvbi__network.html#af9d608a153277b382fe51f7100d02724">name</a>[0])</div><div class="line"> network_name = (<span class="keyword">const</span> <span class="keywordtype">char</span> *) ev->ev.network.<a class="code" href="structvbi__network.html#af9d608a153277b382fe51f7100d02724">name</a>;</div><div class="line"></div><div class="line"> <span class="comment">/* The network name is an ISO-8859-1 string (the API is</span></div><div class="line"><span class="comment"> quite old...) so we convert it to locale encoding,</span></div><div class="line"><span class="comment"> nowadays usually UTF-8. */</span></div><div class="line"> locale_network_name = <a name="a7"></a><a class="code" href="group__Conv.html#gab360448d13ec1cd3c4a7a4babb07243f">vbi_strndup_iconv</a> (<a name="a8"></a><a class="code" href="group__Conv.html#ga69e68f14e65c01622db558df3e6a11f6">vbi_locale_codeset</a> (),</div><div class="line"> <span class="stringliteral">"ISO-8859-1"</span>,</div><div class="line"> network_name,</div><div class="line"> strlen (network_name),</div><div class="line"> <span class="comment">/* repl_char */</span> <span class="charliteral">'?'</span>);</div><div class="line"></div><div class="line"> <span class="comment">/* ASCII. */</span></div><div class="line"> call_sign = <span class="stringliteral">"unknown"</span>;</div><div class="line"> <span class="keywordflow">if</span> (0 != ev->ev.network.<a name="a9"></a><a class="code" href="structvbi__network.html#af0c2eebb0061a42a4c19835d4daca487">call</a>[0])</div><div class="line"> call_sign = (<span class="keyword">const</span> <span class="keywordtype">char</span> *) ev->ev.network.<a class="code" href="structvbi__network.html#af0c2eebb0061a42a4c19835d4daca487">call</a>;</div><div class="line"></div><div class="line"> printf (<span class="stringliteral">"%s: receiving: \"%s\" call sign: \"%s\" "</span></div><div class="line"> <span class="stringliteral">"CNI VPS: 0x%x 8/30/1: 0x%x 8/30/2: 0x%x\n"</span>,</div><div class="line"> event_name,</div><div class="line"> (NULL == locale_network_name) ?</div><div class="line"> <span class="stringliteral">"iconv-error"</span> : locale_network_name,</div><div class="line"> call_sign,</div><div class="line"> ev->ev.network.<a name="a10"></a><a class="code" href="structvbi__network.html#a072907768d911e73c4d96e5be9414954">cni_vps</a>,</div><div class="line"> ev->ev.network.<a name="a11"></a><a class="code" href="structvbi__network.html#ae994f3cec515287f42aaedb7eab6b93c">cni_8301</a>,</div><div class="line"> ev->ev.network.<a name="a12"></a><a class="code" href="structvbi__network.html#a1ce63ca7c685b7563da4115a71a2afed">cni_8302</a>);</div><div class="line"></div><div class="line"> free (locale_network_name);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span></div><div class="line">mainloop (<span class="keywordtype">void</span>)</div><div class="line">{</div><div class="line"> <span class="keyword">struct </span>timeval timeout;</div><div class="line"> <a name="_a13"></a><a class="code" href="structvbi__capture__buffer.html">vbi_capture_buffer</a> *sliced_buffer;</div><div class="line"> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> n_frames;</div><div class="line"></div><div class="line"> <span class="comment">/* Don't wait more than two seconds for the driver</span></div><div class="line"><span class="comment"> to return data. */</span></div><div class="line"> timeout.tv_sec = 2;</div><div class="line"> timeout.tv_usec = 0;</div><div class="line"></div><div class="line"> <span class="comment">/* Should receive a CNI within two seconds,</span></div><div class="line"><span class="comment"> call sign within ten seconds(?). */</span></div><div class="line"> <span class="keywordflow">if</span> (services & VBI_SLICED_CAPTION_525)</div><div class="line"> n_frames = 11 * 30;</div><div class="line"> <span class="keywordflow">else</span></div><div class="line"> n_frames = 3 * 25;</div><div class="line"></div><div class="line"> <span class="keywordflow">for</span> (; n_frames > 0; --n_frames) {</div><div class="line"> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> n_lines;</div><div class="line"> <span class="keywordtype">int</span> r;</div><div class="line"></div><div class="line"> r = <a name="a14"></a><a class="code" href="group__Device.html#ga58dcf2387b685b7c1c09a729f07893c8">vbi_capture_pull</a> (cap,</div><div class="line"> <span class="comment">/* raw_buffer */</span> NULL,</div><div class="line"> &sliced_buffer,</div><div class="line"> &timeout);</div><div class="line"> <span class="keywordflow">switch</span> (r) {</div><div class="line"> <span class="keywordflow">case</span> -1:</div><div class="line"> fprintf (stderr, <span class="stringliteral">"VBI read error %d (%s)\n"</span>,</div><div class="line"> errno, strerror (errno));</div><div class="line"> <span class="comment">/* Could be ignored, esp. EIO with some drivers. */</span></div><div class="line"> exit (EXIT_FAILURE);</div><div class="line"></div><div class="line"> <span class="keywordflow">case</span> 0: </div><div class="line"> fprintf (stderr, <span class="stringliteral">"VBI read timeout\n"</span>);</div><div class="line"> exit (EXIT_FAILURE);</div><div class="line"></div><div class="line"> <span class="keywordflow">case</span> 1: <span class="comment">/* success */</span></div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"></div><div class="line"> <span class="keywordflow">default</span>:</div><div class="line"> assert (0);</div><div class="line"> }</div><div class="line"></div><div class="line"> n_lines = sliced_buffer->size / <span class="keyword">sizeof</span> (<a name="_a15"></a><a class="code" href="structvbi__sliced.html">vbi_sliced</a>);</div><div class="line"></div><div class="line"> <a name="a16"></a><a class="code" href="group__Service.html#ga2e2201e3b2bab9b7fb1bb66ade716772">vbi_decode</a> (dec,</div><div class="line"> (<a class="code" href="structvbi__sliced.html">vbi_sliced</a> *) sliced_buffer->data,</div><div class="line"> n_lines,</div><div class="line"> sliced_buffer->timestamp);</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (quit)</div><div class="line"> <span class="keywordflow">return</span>;</div><div class="line"> }</div><div class="line"></div><div class="line"> printf (<span class="stringliteral">"No network ID received or network unknown.\n"</span>);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span></div><div class="line">main (<span class="keywordtype">void</span>)</div><div class="line">{</div><div class="line"> <span class="keywordtype">char</span> *errstr;</div><div class="line"> vbi_bool success;</div><div class="line"></div><div class="line"> setlocale (LC_ALL, <span class="stringliteral">""</span>);</div><div class="line"></div><div class="line"> services = (VBI_SLICED_TELETEXT_B |</div><div class="line"> VBI_SLICED_VPS |</div><div class="line"> VBI_SLICED_CAPTION_525);</div><div class="line"></div><div class="line"> cap = <a name="a17"></a><a class="code" href="group__Device.html#ga85ba4554b337ecb053168bb88f713e5f">vbi_capture_v4l2_new</a> (<span class="stringliteral">"/dev/vbi"</span>,</div><div class="line"> <span class="comment">/* buffers */</span> 5,</div><div class="line"> &services,</div><div class="line"> <span class="comment">/* strict */</span> 0,</div><div class="line"> &errstr,</div><div class="line"> <span class="comment">/* verbose */</span> FALSE);</div><div class="line"> <span class="keywordflow">if</span> (NULL == cap) {</div><div class="line"> fprintf (stderr,</div><div class="line"> <span class="stringliteral">"Cannot capture VBI data with V4L2 interface:\n"</span></div><div class="line"> <span class="stringliteral">"%s\n"</span>,</div><div class="line"> errstr);</div><div class="line"></div><div class="line"> free (errstr);</div><div class="line"></div><div class="line"> exit (EXIT_FAILURE);</div><div class="line"> }</div><div class="line"></div><div class="line"> dec = <a name="a18"></a><a class="code" href="group__Service.html#ga3c09b7fa196326f51409a91e2857ba5e">vbi_decoder_new</a> ();</div><div class="line"> assert (NULL != dec);</div><div class="line"></div><div class="line"> success = <a name="a19"></a><a class="code" href="group__Event.html#gacd13f9d8a2d47a4393541b7411fe426a">vbi_event_handler_add</a> (dec,</div><div class="line"> (VBI_EVENT_NETWORK |</div><div class="line"> VBI_EVENT_NETWORK_ID),</div><div class="line"> handler,</div><div class="line"> <span class="comment">/* user_data */</span> NULL);</div><div class="line"> assert (success);</div><div class="line"></div><div class="line"> mainloop ();</div><div class="line"></div><div class="line"> <a name="a20"></a><a class="code" href="group__Service.html#gab3f52f0b71746c9081c053a33cad7bce">vbi_decoder_delete</a> (dec);</div><div class="line"></div><div class="line"> <a name="a21"></a><a class="code" href="group__Device.html#gaec518b62f39b83c80b06cc0a4affbee6">vbi_capture_delete</a> (cap);</div><div class="line"></div><div class="line"> exit (EXIT_SUCCESS);</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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