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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * broadvoice - a library for the BroadVoice 16 and 32 codecs</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * bvcommon.h -</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * Adapted by Steve Underwood <steveu@coppice.org> from code which is</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * Copyright 2000-2009 Broadcom Corporation</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * All rights reserved.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * This program is free software; you can redistribute it and/or modify</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * it under the terms of the GNU Lesser General Public License version 2.1,</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * as published by the Free Software Foundation.</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> *</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * This program is distributed in the hope that it will be useful,</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * GNU Lesser General Public License for more details.</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> *</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * License along with this program; if not, write to the Free Software</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> *</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * $Id: bvcommon.h,v 1.1.1.1 2009/11/19 12:10:48 steveu Exp $</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> */</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include "typedef.h"</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="preprocessor">#ifndef BVCOMMON_H</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#define BVCOMMON_H</span></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> <span class="comment">/* Function Prototypes */</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keywordtype">void</span> apfilter(<span class="keyword">const</span> Float *a, <span class="comment">/* (i) a[m+1] prediction coefficients (m=10) */</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordtype">int</span> m, <span class="comment">/* (i) LPC order */</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  Float *x, <span class="comment">/* (i) input signal */</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  Float *y, <span class="comment">/* (o) output signal */</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordtype">int</span> lg, <span class="comment">/* (i) size of filtering */</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  Float *mem, <span class="comment">/* (i/o) input memory */</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  int16_t update); <span class="comment">/* (i) flag for memory update */</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keywordtype">void</span> azfilter(<span class="keyword">const</span> Float *a, <span class="comment">/* (i) prediction coefficients */</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordtype">int</span> m, <span class="comment">/* (i) LPC order */</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  Float *x, <span class="comment">/* (i) input signal vector */</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  Float *y, <span class="comment">/* (o) output signal vector */</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordtype">int</span> lg, <span class="comment">/* (i) size of filtering */</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  Float *mem, <span class="comment">/* (i/o) filter memory before filtering */</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  int16_t update); <span class="comment">/* (i) flag for memory update */</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="keywordtype">void</span> Autocor(Float *r, <span class="comment">/* (o) : Autocorrelations */</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  Float *x, <span class="comment">/* (i) : Input signal */</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">const</span> Float *window, <span class="comment">/* (i) : LPC Analysis window */</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">int</span> l_window, <span class="comment">/* (i) : window length */</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">int</span> m); <span class="comment">/* (i) : LPC order */</span></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="keywordtype">void</span> Levinson(Float *r, <span class="comment">/* (i): autocorrelation coefficients */</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  Float *a, <span class="comment">/* (o): LPC coefficients */</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  Float *old_a, <span class="comment">/* (i/o): LPC coefficients of previous frame */</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordtype">int</span> m); <span class="comment">/* (i): LPC order */</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="keywordtype">void</span> a2lsp(Float pc[], <span class="comment">/* (i) input the np+1 predictor coeff. */</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  Float lsp[], <span class="comment">/* (o) line spectral pairs */</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  Float old_lsp[]); <span class="comment">/* (i/o) old lsp[] (in case not found 10 roots) */</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="keywordtype">void</span> lsp2a(Float *lsp, <span class="comment">/* (i) LSP vector */</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  Float *a); <span class="comment">/* (o) LPC coefficients */</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keywordtype">void</span> stblz_lsp(Float *lsp, <span class="keywordtype">int</span> order);</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="keywordtype">int</span> stblchck(Float *x, <span class="keywordtype">int</span> vdim);</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> <span class="comment">/* LPC to LSP Conversion */</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="keyword">extern</span> Float grid[];</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">/* LPC bandwidth expansion */</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="keyword">extern</span> Float bwel[];</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment">/* LPC WEIGHTING FILTER */</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="keyword">extern</span> Float STWAL[];</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">/* ----- Basic Codec Parameters ----- */</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor">#define LPCO 8 </span><span class="comment">/* LPC Order */</span><span class="preprocessor"></span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor">#define Ngrd 60 </span><span class="comment">/* LPC to LSP Conversion */</span><span class="preprocessor"></span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor">#define LSPMIN 0.00150 </span><span class="comment">/* minimum LSP frequency, 6/12 Hz for BV16/BV32 */</span><span class="preprocessor"></span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="preprocessor">#define LSPMAX 0.99775 </span><span class="comment">/* maximum LSP frequency, 3991/7982 Hz for BV16/BV32 */</span><span class="preprocessor"></span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor">#define DLSPMIN 0.01250 </span><span class="comment">/* minimum LSP spacing, 50/100 Hz for BV16/BV32 */</span><span class="preprocessor"></span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="preprocessor">#define STBLDIM 3 </span><span class="comment">/* dimension of stability enforcement */</span><span class="preprocessor"></span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="preprocessor">#endif </span><span class="comment">/* BVCOMMON_H */</span><span class="preprocessor"></span></div></div><!-- fragment --></div><!-- contents -->
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