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 <span id="projectnumber">0.2.35</span>
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<div class="title">examples/pdc1.c</div> </div>
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<div class="fragment"><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * libzvbi VPS/PDC example 1</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * Copyright (C) 2009 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: pdc1.c,v 1.2 2009/03/23 01:30:42 mschimek Exp $ */</span></div><div class="line"></div><div class="line"><span class="comment">/* This example shows how to receive Program IDs transmitted in VPS</span></div><div class="line"><span class="comment"> and Teletext packets using the libzvbi VBI decoder. Example pdc2.c</span></div><div class="line"><span class="comment"> demonstrates how video recorders respond to Program IDs.</span></div><div class="line"><span class="comment"></span></div><div class="line"><span class="comment"> If you prefer to decode the VPS and Teletext packets directly see</span></div><div class="line"><span class="comment"> test/decode.c for an example.</span></div><div class="line"><span class="comment"></span></div><div class="line"><span class="comment"> gcc -o pdc1 pdc1.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"></div><div class="line"><span class="comment">/* Attention! This function returns a static string. */</span></div><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *</div><div class="line">pil_str (<a class="code" href="group__ProgramID.html#ga870eeecedc6aed609b9f53d4dbe0f6c7">vbi_pil</a> pil)</div><div class="line">{</div><div class="line"> <span class="keyword">static</span> <span class="keywordtype">char</span> buffer[32];</div><div class="line"></div><div class="line"> <span class="keywordflow">switch</span> (pil) {</div><div class="line"> <span class="keywordflow">case</span> <a name="a2"></a><a class="code" href="group__ProgramID.html#gga05589fbab0657f08285ebdfe93f5ec9eae7cbef095ebb79470785785bebdb2f8d">VBI_PIL_TIMER_CONTROL</a>: <span class="keywordflow">return</span> <span class="stringliteral">"TC"</span>;</div><div class="line"> <span class="keywordflow">case</span> <a name="a3"></a><a class="code" href="group__ProgramID.html#gga05589fbab0657f08285ebdfe93f5ec9eaad30c6505f26ef2b6e26626afdff02dd">VBI_PIL_INHIBIT_TERMINATE</a>: <span class="keywordflow">return</span> <span class="stringliteral">"RI/T"</span>;</div><div class="line"> <span class="keywordflow">case</span> <a name="a4"></a><a class="code" href="group__ProgramID.html#gga05589fbab0657f08285ebdfe93f5ec9ea835908e1f719f7761589ac1f3b968cb4">VBI_PIL_INTERRUPTION</a>: <span class="keywordflow">return</span> <span class="stringliteral">"INT"</span>;</div><div class="line"> <span class="keywordflow">case</span> <a name="a5"></a><a class="code" href="group__ProgramID.html#gga05589fbab0657f08285ebdfe93f5ec9ea4084b4cb78ad4667f7645101adebb3e1">VBI_PIL_CONTINUE</a>: <span class="keywordflow">return</span> <span class="stringliteral">"CONT"</span>;</div><div class="line"> <span class="keywordflow">case</span> <a name="a6"></a><a class="code" href="group__ProgramID.html#gga05589fbab0657f08285ebdfe93f5ec9eac9b7c435e58a2f76a87f1acb221630f9">VBI_PIL_NSPV</a>: <span class="keywordflow">return</span> <span class="stringliteral">"NSPV/END"</span>;</div><div class="line"></div><div class="line"> <span class="keywordflow">default</span>:</div><div class="line"> snprintf (buffer, <span class="keyword">sizeof</span> (buffer),</div><div class="line"> <span class="stringliteral">"%02u%02uT%02u%02u"</span>,</div><div class="line"> <a name="a7"></a><a class="code" href="group__ProgramID.html#gaae3974c3e680d42322edaad37b35ebcc">VBI_PIL_MONTH</a> (pil),</div><div class="line"> <a name="a8"></a><a class="code" href="group__ProgramID.html#ga138a4f95542c36527f6df6ee08094f2f">VBI_PIL_DAY</a> (pil),</div><div class="line"> <a name="a9"></a><a class="code" href="group__ProgramID.html#ga78d71b2b88dd3729e5364f6061000ebf">VBI_PIL_HOUR</a> (pil),</div><div class="line"> <a name="a10"></a><a class="code" href="group__ProgramID.html#gaacada356d88add876dc7484892231e73">VBI_PIL_MINUTE</a> (pil));</div><div class="line"> <span class="keywordflow">return</span> buffer;</div><div class="line"> }</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"><a name="_a11"></a><a class="code" href="structevent__handler.html">event_handler</a> (<a name="_a12"></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> <a name="_a13"></a><a class="code" href="structvbi__program__id.html">vbi_program_id</a> *pid;</div><div class="line"></div><div class="line"> user_data = user_data; <span class="comment">/* unused, no warning please */</span></div><div class="line"></div><div class="line"> pid = ev-><a name="a14"></a>ev.<a name="a15"></a>prog_id;</div><div class="line"></div><div class="line"> printf (<span class="stringliteral">"Received PIL %s/%02X on LC %u.\n"</span>,</div><div class="line"> pil_str (pid-><a name="a16"></a><a class="code" href="structvbi__program__id.html#a30c0862c008de112f4222e1208038d58">pil</a>), pid-><a name="a17"></a><a class="code" href="structvbi__program__id.html#a069f84e950d47f19a589cbe4a3603068">pty</a>, pid-><a name="a18"></a><a class="code" href="structvbi__program__id.html#a90794327986da193ddb76d518331589d">channel</a>);</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"></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="keywordflow">for</span> (;;) {</div><div class="line"> <a name="_a19"></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_lines;</div><div class="line"> <span class="keywordtype">int</span> r;</div><div class="line"></div><div class="line"> r = <a name="a20"></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-><a name="a21"></a>size / <span class="keyword">sizeof</span> (<a name="_a22"></a><a class="code" href="structvbi__sliced.html">vbi_sliced</a>);</div><div class="line"></div><div class="line"> <a name="a23"></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-><a name="a24"></a>data,</div><div class="line"> n_lines,</div><div class="line"> sliced_buffer-><a name="a25"></a>timestamp);</div><div class="line"> }</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"> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> services;</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"></div><div class="line"> cap = <a name="a26"></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="a27"></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="a28"></a><a class="code" href="group__Event.html#gacd13f9d8a2d47a4393541b7411fe426a">vbi_event_handler_add</a> (dec,</div><div class="line"> VBI_EVENT_PROG_ID,</div><div class="line"> <a class="code" href="structevent__handler.html">event_handler</a>,</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="a29"></a><a class="code" href="group__Service.html#gab3f52f0b71746c9081c053a33cad7bce">vbi_decoder_delete</a> (dec);</div><div class="line"></div><div class="line"> <a name="a30"></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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