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<div class="title">digital_additive_scrambler_bb.h</div> </div>
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<a href="digital__additive__scrambler__bb_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* -*- c++ -*- */</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright 2008,2010,2012 Free Software Foundation, Inc.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This file is part of GNU Radio</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * GNU Radio is free software; you can redistribute it and/or modify</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * the Free Software Foundation; either version 3, or (at your option)</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * any later version.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * GNU Radio is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * GNU General Public License for more details.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * You should have received a copy of the GNU General Public License</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * along with GNU Radio; see the file COPYING. If not, write to</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street,</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * Boston, MA 02110-1301, USA.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#ifndef INCLUDED_GR_ADDITIVE_SCRAMBLER_BB_H</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GR_ADDITIVE_SCRAMBLER_BB_H</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <<a class="code" href="digital__api_8h.html">digital_api.h</a>></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <<a class="code" href="gr__sync__block_8h.html">gr_sync_block.h</a>></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <<a class="code" href="lfsr_8h.html">analog/lfsr.h</a>></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">class </span><a class="code" href="classdigital__additive__scrambler__bb.html">digital_additive_scrambler_bb</a>;</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">typedef</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">boost::shared_ptr<digital_additive_scrambler_bb></a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">digital_additive_scrambler_bb_sptr</a>;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <a class="code" href="digital__api_8h.html#ae14969f36ec69051c4b2f13a0db7e9ba">DIGITAL_API</a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">digital_additive_scrambler_bb_sptr</a></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <a class="code" href="digital__additive__scrambler__bb_8h.html#ac4fae90dc0ec62ad5d2f534531fa5a9b">digital_make_additive_scrambler_bb</a>(<span class="keywordtype">int</span> mask, <span class="keywordtype">int</span> seed,</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">int</span> len, <span class="keywordtype">int</span> count=0);</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"></span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">/*!</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * Scramble an input stream using an LFSR. This block works on the LSB only</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * of the input data stream, i.e., on an "unpacked binary" stream, and</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * produces the same format on its output.</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * \param mask Polynomial mask for LFSR</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * \param seed Initial shift register contents</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * \param len Shift register length</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * \param count Number of bits after which shift register is reset, 0=never</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * The scrambler works by XORing the incoming bit stream by the output of</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * the LFSR. Optionally, after 'count' bits have been processed, the shift</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * register is reset to the seed value. This allows processing fixed length</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * vectors of samples.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * \ingroup coding_blk</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div>
<div class="line"><a name="l00054"></a><span class="lineno"><a class="code" href="classdigital__additive__scrambler__bb.html"> 54</a></span> <span class="keyword">class </span><a class="code" href="digital__api_8h.html#ae14969f36ec69051c4b2f13a0db7e9ba">DIGITAL_API</a> <a class="code" href="classdigital__additive__scrambler__bb.html">digital_additive_scrambler_bb</a> : <span class="keyword">public</span> <a class="code" href="classgr__sync__block.html" title="synchronous 1:1 input to output with historyOverride work to provide the signal processing implementa...">gr_sync_block</a></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> {</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">friend</span> <a class="code" href="digital__api_8h.html#ae14969f36ec69051c4b2f13a0db7e9ba">DIGITAL_API</a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">digital_additive_scrambler_bb_sptr</a></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <a class="code" href="digital__additive__scrambler__bb_8h.html#ac4fae90dc0ec62ad5d2f534531fa5a9b">digital_make_additive_scrambler_bb</a>(<span class="keywordtype">int</span> mask, <span class="keywordtype">int</span> seed,</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">int</span> len, <span class="keywordtype">int</span> count);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <a class="code" href="classgr_1_1analog_1_1lfsr.html" title="Fibonacci Linear Feedback Shift Register using specified polynomial maskGenerates a maximal length ps...">gr::analog::lfsr</a> d_lfsr;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">int</span> d_count;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordtype">int</span> d_bits;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <a class="code" href="classdigital__additive__scrambler__bb.html">digital_additive_scrambler_bb</a>(<span class="keywordtype">int</span> mask, <span class="keywordtype">int</span> seed,</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordtype">int</span> len, <span class="keywordtype">int</span> count);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">int</span> <a class="code" href="classgr__sync__block.html#a0c523f4285a6eb690f677ee6295ab117" title="just like gr_block::general_work, only this arranges to call consume_each for you">work</a>(<span class="keywordtype">int</span> noutput_items,</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <a class="code" href="gr__types_8h.html#a9852a3d906d823cb70eb9c29e7f2a43d">gr_vector_const_void_star</a> &input_items,</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <a class="code" href="gr__types_8h.html#acd3f499576e769966ea44554b359d949">gr_vector_void_star</a> &output_items);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> };</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_GR_ADDITIVE_SCRAMBLER_BB_H */</span><span class="preprocessor"></span></div>
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