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<div id="projectname">ZVBI Library
 <span id="projectnumber">0.2.35</span>
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<div class="header">
<div class="summary">
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">Error correction functions<div class="ingroups"><a class="el" href="group__Raw.html">Raw VBI</a></div></div> </div>
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<div class="contents">
<p>Helper functions to decode sliced VBI data.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gaac266ab17d0044d1adbcf7f113329290"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#gaac266ab17d0044d1adbcf7f113329290">vbi_par</a> (uint8_t *p, unsigned int n)</td></tr>
<tr class="separator:gaac266ab17d0044d1adbcf7f113329290"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafa73f04f095b154f3237f7d4e98f18b7"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#gafa73f04f095b154f3237f7d4e98f18b7">vbi_unpar</a> (uint8_t *p, unsigned int n)</td></tr>
<tr class="separator:gafa73f04f095b154f3237f7d4e98f18b7"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga997d16edd4deed54dfca6943f5b7b885"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#ga997d16edd4deed54dfca6943f5b7b885">vbi_ham24p</a> (uint8_t *p, unsigned int c)</td></tr>
<tr class="separator:ga997d16edd4deed54dfca6943f5b7b885"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5d764f42094e48760cf3e754776ac3fd"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#ga5d764f42094e48760cf3e754776ac3fd">vbi_unham24p</a> (const uint8_t *p)</td></tr>
<tr class="separator:ga5d764f42094e48760cf3e754776ac3fd"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab59fd75a6908d9b03166c9be36d2f4ce"><td class="memItemLeft" align="right" valign="top">_vbi_inline unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#gab59fd75a6908d9b03166c9be36d2f4ce">vbi_rev8</a> (unsigned int c)</td></tr>
<tr class="separator:gab59fd75a6908d9b03166c9be36d2f4ce"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga0b14a7e987786a8746987b7dcb0c955f"><td class="memItemLeft" align="right" valign="top">_vbi_inline unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#ga0b14a7e987786a8746987b7dcb0c955f">vbi_rev16</a> (unsigned int c)</td></tr>
<tr class="separator:ga0b14a7e987786a8746987b7dcb0c955f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf0a2792d50100576982c44cd64fa7fd4"><td class="memItemLeft" align="right" valign="top">_vbi_inline unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#gaf0a2792d50100576982c44cd64fa7fd4">vbi_rev16p</a> (const uint8_t *p)</td></tr>
<tr class="separator:gaf0a2792d50100576982c44cd64fa7fd4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf85ae2c13320d8dd664863ebff8165ff"><td class="memItemLeft" align="right" valign="top">_vbi_inline unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#gaf85ae2c13320d8dd664863ebff8165ff">vbi_par8</a> (unsigned int c)</td></tr>
<tr class="separator:gaf85ae2c13320d8dd664863ebff8165ff"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga49d1cf6af476a4fa10c0312f373ac1a0"><td class="memItemLeft" align="right" valign="top">_vbi_inline int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#ga49d1cf6af476a4fa10c0312f373ac1a0">vbi_unpar8</a> (unsigned int c)</td></tr>
<tr class="separator:ga49d1cf6af476a4fa10c0312f373ac1a0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga34d1be5fbcad2db35b7003f8d5e2b905"><td class="memItemLeft" align="right" valign="top">_vbi_inline unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#ga34d1be5fbcad2db35b7003f8d5e2b905">vbi_ham8</a> (unsigned int c)</td></tr>
<tr class="separator:ga34d1be5fbcad2db35b7003f8d5e2b905"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga91fcc67515be04557c53c3e076159507"><td class="memItemLeft" align="right" valign="top">_vbi_inline int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#ga91fcc67515be04557c53c3e076159507">vbi_unham8</a> (unsigned int c)</td></tr>
<tr class="separator:ga91fcc67515be04557c53c3e076159507"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab62090ec932d135dea3dde39e4e4cc55"><td class="memItemLeft" align="right" valign="top">_vbi_inline int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Error.html#gab62090ec932d135dea3dde39e4e4cc55">vbi_unham16p</a> (const uint8_t *p)</td></tr>
<tr class="separator:gab62090ec932d135dea3dde39e4e4cc55"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Helper functions to decode sliced VBI data. </p>
<h2 class="groupheader">Function Documentation</h2>
<a id="gaac266ab17d0044d1adbcf7f113329290"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaac266ab17d0044d1adbcf7f113329290">§ </a></span>vbi_par()</h2>
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<td class="memname">void vbi_par </td>
<td>(</td>
<td class="paramtype">uint8_t * </td>
<td class="paramname"><em>p</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>n</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">p</td><td>Array of unsigned bytes. </td></tr>
<tr><td class="paramname">n</td><td>Size of array.</td></tr>
</table>
</dd>
</dl>
<p>Of each byte of the array, changes the most significant bit to make the number of set bits odd.</p>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
<p>Referenced by <a class="el" href="group__Error.html#ga49d1cf6af476a4fa10c0312f373ac1a0">vbi_unpar8()</a>.</p>
</div>
</div>
<a id="gafa73f04f095b154f3237f7d4e98f18b7"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gafa73f04f095b154f3237f7d4e98f18b7">§ </a></span>vbi_unpar()</h2>
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<table class="memname">
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<td class="memname">int vbi_unpar </td>
<td>(</td>
<td class="paramtype">uint8_t * </td>
<td class="paramname"><em>p</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>n</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">p</td><td>Array of unsigned bytes. </td></tr>
<tr><td class="paramname">n</td><td>Size of array.</td></tr>
</table>
</dd>
</dl>
<p>Tests the parity and clears the most significant bit of each byte of the array.</p>
<dl class="section return"><dt>Returns</dt><dd>A negative value if any byte of the array had even parity (sum of bits modulo 2 is 0).</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
<p>Referenced by <a class="el" href="group__Error.html#ga49d1cf6af476a4fa10c0312f373ac1a0">vbi_unpar8()</a>.</p>
</div>
</div>
<a id="ga997d16edd4deed54dfca6943f5b7b885"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga997d16edd4deed54dfca6943f5b7b885">§ </a></span>vbi_ham24p()</h2>
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<td class="memname">void vbi_ham24p </td>
<td>(</td>
<td class="paramtype">uint8_t * </td>
<td class="paramname"><em>p</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>c</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">p</td><td>A Hamming 24/18 protected 24 bit word will be stored here, last significant byte first, lsb first transmitted. </td></tr>
<tr><td class="paramname">c</td><td>Integer between 0 ... 1 << 18 - 1.</td></tr>
</table>
</dd>
</dl>
<p>Encodes an 18 bit word with Hamming 24/18 protection as specified in ETS 300 706, Section 8.3.</p>
<dl class="section since"><dt>Since</dt><dd>0.2.27 </dd></dl>
<p>Referenced by <a class="el" href="group__Error.html#gab62090ec932d135dea3dde39e4e4cc55">vbi_unham16p()</a>.</p>
</div>
</div>
<a id="ga5d764f42094e48760cf3e754776ac3fd"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5d764f42094e48760cf3e754776ac3fd">§ </a></span>vbi_unham24p()</h2>
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<div class="memproto">
<table class="memname">
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<td class="memname">int vbi_unham24p </td>
<td>(</td>
<td class="paramtype">const uint8_t * </td>
<td class="paramname"><em>p</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">p</td><td>Pointer to a Hamming 24/18 protected 24 bit word, last significant byte first, lsb first transmitted.</td></tr>
</table>
</dd>
</dl>
<p>Decodes a Hamming 24/18 protected byte triplet as specified in ETS 300 706, Section 8.3.</p>
<dl class="section return"><dt>Returns</dt><dd>Triplet data bits D18 [msb] ... D1 [lsb] or a negative value if the triplet contained uncorrectable errors.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
<p>Referenced by <a class="el" href="group__Error.html#gab62090ec932d135dea3dde39e4e4cc55">vbi_unham16p()</a>.</p>
</div>
</div>
<a id="gab59fd75a6908d9b03166c9be36d2f4ce"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gab59fd75a6908d9b03166c9be36d2f4ce">§ </a></span>vbi_rev8()</h2>
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<td class="memname">_vbi_inline unsigned int vbi_rev8 </td>
<td>(</td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>c</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">c</td><td>Unsigned byte.</td></tr>
</table>
</dd>
</dl>
<p>Reverses the bits of the argument.</p>
<dl class="section return"><dt>Returns</dt><dd>Data bits 0 [msb] ... 7 [lsb].</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
<p>Referenced by <a class="el" href="group__Packet830.html#ga67d3820f3f859189fea8143293b9a9e1">vbi_decode_teletext_8302_cni()</a>, and <a class="el" href="group__Packet830.html#gad0461de5ceb8ef217d2ad62cb4438809">vbi_decode_teletext_8302_pdc()</a>.</p>
</div>
</div>
<a id="ga0b14a7e987786a8746987b7dcb0c955f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga0b14a7e987786a8746987b7dcb0c955f">§ </a></span>vbi_rev16()</h2>
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<td class="memname">_vbi_inline unsigned int vbi_rev16 </td>
<td>(</td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>c</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">c</td><td>Unsigned 16 bit word.</td></tr>
</table>
</dd>
</dl>
<p>Reverses (or "reflects") the bits of the argument.</p>
<dl class="section return"><dt>Returns</dt><dd>Data bits 0 [msb] ... 15 [lsb].</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
</div>
</div>
<a id="gaf0a2792d50100576982c44cd64fa7fd4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaf0a2792d50100576982c44cd64fa7fd4">§ </a></span>vbi_rev16p()</h2>
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<td class="memname">_vbi_inline unsigned int vbi_rev16p </td>
<td>(</td>
<td class="paramtype">const uint8_t * </td>
<td class="paramname"><em>p</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">p</td><td>Pointer to a 16 bit word, last significant byte first.</td></tr>
</table>
</dd>
</dl>
<p>Reverses (or "reflects") the bits of the argument.</p>
<dl class="section return"><dt>Returns</dt><dd>Data bits 0 [msb] ... 15 [lsb].</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
<p>Referenced by <a class="el" href="group__Packet830.html#gad73eef286a3222ceab3be07436e0a45d">vbi_decode_teletext_8301_cni()</a>.</p>
</div>
</div>
<a id="gaf85ae2c13320d8dd664863ebff8165ff"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaf85ae2c13320d8dd664863ebff8165ff">§ </a></span>vbi_par8()</h2>
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<div class="memproto">
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<td class="memname">_vbi_inline unsigned int vbi_par8 </td>
<td>(</td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>c</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">c</td><td>Unsigned byte.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Changes the most significant bit of the byte to make the number of set bits odd.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
<p>Referenced by <a class="el" href="group__Device.html#gaa0b81b4226106cf38b541597eff40f2d">vbi_capture_sim_add_noise()</a>.</p>
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<a id="ga49d1cf6af476a4fa10c0312f373ac1a0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga49d1cf6af476a4fa10c0312f373ac1a0">§ </a></span>vbi_unpar8()</h2>
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<td class="memname">_vbi_inline int vbi_unpar8 </td>
<td>(</td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>c</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">c</td><td>Unsigned byte.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>If the byte has odd parity (sum of bits modulo 2 is 1) the byte AND 127, otherwise a negative value.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
<p>References <a class="el" href="group__Error.html#gaac266ab17d0044d1adbcf7f113329290">vbi_par()</a>, and <a class="el" href="group__Error.html#gafa73f04f095b154f3237f7d4e98f18b7">vbi_unpar()</a>.</p>
<p>Referenced by <a class="el" href="group__XDSDemux.html#gab46df46f3dfcc51c605a618ecbdac01f">vbi_xds_demux_feed()</a>.</p>
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<a id="ga34d1be5fbcad2db35b7003f8d5e2b905"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga34d1be5fbcad2db35b7003f8d5e2b905">§ </a></span>vbi_ham8()</h2>
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<td class="memname">_vbi_inline unsigned int vbi_ham8 </td>
<td>(</td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>c</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">c</td><td>Integer between 0 ... 15.</td></tr>
</table>
</dd>
</dl>
<p>Encodes a nibble with Hamming 8/4 protection as specified in EN 300 706, Section 8.2.</p>
<dl class="section return"><dt>Returns</dt><dd>Hamming encoded unsigned byte, lsb first transmitted.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
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<a id="ga91fcc67515be04557c53c3e076159507"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga91fcc67515be04557c53c3e076159507">§ </a></span>vbi_unham8()</h2>
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<td class="memname">_vbi_inline int vbi_unham8 </td>
<td>(</td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>c</em></td><td>)</td>
<td></td>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">c</td><td>Hamming 8/4 protected byte, lsb first transmitted.</td></tr>
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</dd>
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<p>Decodes a Hamming 8/4 protected byte as specified in EN 300 706, Section 8.2.</p>
<dl class="section return"><dt>Returns</dt><dd>Data bits (D4 [msb] ... D1 [lsb]) or a negative value if the byte contained uncorrectable errors.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
<p>Referenced by <a class="el" href="group__Packet830.html#gad0461de5ceb8ef217d2ad62cb4438809">vbi_decode_teletext_8302_pdc()</a>, <a class="el" href="group__IDLDemux.html#ga490f1961add5aa7d0f27b3fd913f2f59">vbi_idl_demux_feed()</a>, and <a class="el" href="group__PFCDemux.html#gae334afca20ce542494b2cf783b8fae39">vbi_pfc_demux_reset()</a>.</p>
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<a id="gab62090ec932d135dea3dde39e4e4cc55"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gab62090ec932d135dea3dde39e4e4cc55">§ </a></span>vbi_unham16p()</h2>
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<td class="memname">_vbi_inline int vbi_unham16p </td>
<td>(</td>
<td class="paramtype">const uint8_t * </td>
<td class="paramname"><em>p</em></td><td>)</td>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">p</td><td>Pointer to a Hamming 8/4 protected 16 bit word, last significant byte first, lsb first transmitted.</td></tr>
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</dd>
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<p>Decodes a Hamming 8/4 protected byte pair as specified in EN 300 706, Section 8.2.</p>
<dl class="section return"><dt>Returns</dt><dd>Data bits D4 [msb] ... D1 of first byte and D4 ... D1 [lsb] of second byte, or a negative value if any of the bytes contained uncorrectable errors.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>0.2.12 </dd></dl>
<p>References <a class="el" href="group__Error.html#ga997d16edd4deed54dfca6943f5b7b885">vbi_ham24p()</a>, and <a class="el" href="group__Error.html#ga5d764f42094e48760cf3e754776ac3fd">vbi_unham24p()</a>.</p>
<p>Referenced by <a class="el" href="group__Packet830.html#ga67d3820f3f859189fea8143293b9a9e1">vbi_decode_teletext_8302_cni()</a>, <a class="el" href="group__Packet830.html#gad0461de5ceb8ef217d2ad62cb4438809">vbi_decode_teletext_8302_pdc()</a>, <a class="el" href="group__PFCDemux.html#gaa4b895cf6895630a82608b3225c6412c">vbi_pfc_demux_feed()</a>, and <a class="el" href="group__PFCDemux.html#gae334afca20ce542494b2cf783b8fae39">vbi_pfc_demux_reset()</a>.</p>
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