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<h1>src/libsphinxbase/fe/yin.c</h1> </div>
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<a href="yin_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */</span>
<a name="l00002"></a>00002 <span class="comment">/*</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright (c) 2008 Beyond Access, Inc. All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"> * </span>
<a name="l00005"></a>00005 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00006"></a>00006 <span class="comment"> * modification, are permitted provided that the following conditions</span>
<a name="l00007"></a>00007 <span class="comment"> * are met:</span>
<a name="l00008"></a>00008 <span class="comment"> * </span>
<a name="l00009"></a>00009 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
<a name="l00010"></a>00010 <span class="comment"> * notice, this list of conditions and the following disclaimer. </span>
<a name="l00011"></a>00011 <span class="comment"> * </span>
<a name="l00012"></a>00012 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
<a name="l00013"></a>00013 <span class="comment"> * notice, this list of conditions and the following disclaimer in</span>
<a name="l00014"></a>00014 <span class="comment"> * the documentation and/or other materials provided with the</span>
<a name="l00015"></a>00015 <span class="comment"> * distribution.</span>
<a name="l00016"></a>00016 <span class="comment"> * </span>
<a name="l00017"></a>00017 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY BEYOND ACCESS, INC. ``AS IS'' AND ANY</span>
<a name="l00018"></a>00018 <span class="comment"> * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
<a name="l00019"></a>00019 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR</span>
<a name="l00020"></a>00020 <span class="comment"> * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BEYOND ACCESS, INC. NOR</span>
<a name="l00021"></a>00021 <span class="comment"> * ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,</span>
<a name="l00022"></a>00022 <span class="comment"> * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,</span>
<a name="l00023"></a>00023 <span class="comment"> * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR</span>
<a name="l00024"></a>00024 <span class="comment"> * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF</span>
<a name="l00025"></a>00025 <span class="comment"> * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING</span>
<a name="l00026"></a>00026 <span class="comment"> * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
<a name="l00027"></a>00027 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00028"></a>00028 <span class="comment"> */</span>
<a name="l00029"></a>00029
<a name="l00035"></a>00035 <span class="comment">/* This implements part of the YIN algorithm:</span>
<a name="l00036"></a>00036 <span class="comment"> *</span>
<a name="l00037"></a>00037 <span class="comment"> * "YIN, a fundamental frequency estimator for speech and music".</span>
<a name="l00038"></a>00038 <span class="comment"> * Alain de Cheveigné and Hideki Kawahara. Journal of the Acoustical</span>
<a name="l00039"></a>00039 <span class="comment"> * Society of America, 111 (4), April 2002.</span>
<a name="l00040"></a>00040 <span class="comment"> */</span>
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="preprocessor">#include "sphinxbase/prim_type.h"</span>
<a name="l00043"></a>00043 <span class="preprocessor">#include "sphinxbase/ckd_alloc.h"</span>
<a name="l00044"></a>00044 <span class="preprocessor">#include "sphinxbase/fixpoint.h"</span>
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="preprocessor">#include "sphinxbase/yin.h"</span>
<a name="l00047"></a>00047
<a name="l00048"></a>00048 <span class="preprocessor">#include <stdio.h></span>
<a name="l00049"></a>00049
<a name="l00050"></a><a class="code" href="structyin__s.html">00050</a> <span class="keyword">struct </span><a class="code" href="structyin__s.html">yin_s</a> {
<a name="l00051"></a>00051 uint16 frame_size;
<a name="l00052"></a><a class="code" href="structyin__s.html#a8cca938167af6b504458ff9578420afd">00052</a> uint16 <a class="code" href="structyin__s.html#a8cca938167af6b504458ff9578420afd" title="Size of analysis frame.">search_threshold</a>;
<a name="l00053"></a><a class="code" href="structyin__s.html#a208dfba1535fdd31962e687d82913dfd">00053</a> uint16 <a class="code" href="structyin__s.html#a208dfba1535fdd31962e687d82913dfd" title="Range around best local estimate to search, in Q15.">search_range</a>;
<a name="l00054"></a><a class="code" href="structyin__s.html#af4f11d14a36bbdc19863fa8335237423">00054</a> uint16 <a class="code" href="structyin__s.html#af4f11d14a36bbdc19863fa8335237423" title="Number of frames read so far.">nfr</a>;
<a name="l00056"></a><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03">00056</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>;
<a name="l00057"></a><a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e">00057</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e" title="First frame in window.">wstart</a>;
<a name="l00058"></a><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660">00058</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a>;
<a name="l00059"></a><a class="code" href="structyin__s.html#a61ca0fc8444a1bdde10aca37dc9f0f56">00059</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="structyin__s.html#a61ca0fc8444a1bdde10aca37dc9f0f56" title="Hoch Hech! Are we at the utterance end?">endut</a>;
<a name="l00061"></a><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11">00061</a> fixed32 **<a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>;
<a name="l00062"></a><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8">00062</a> uint16 *<a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>;
<a name="l00063"></a>00063 };
<a name="l00064"></a>00064
<a name="l00068"></a>00068 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00069"></a>00069 cmn_diff(int16 <span class="keyword">const</span> *signal, int32 *out_diff, <span class="keywordtype">int</span> ndiff)
<a name="l00070"></a>00070 {
<a name="l00071"></a>00071 uint32 cum, cshift;
<a name="l00072"></a>00072 int32 t, tscale;
<a name="l00073"></a>00073
<a name="l00074"></a>00074 out_diff[0] = 32768;
<a name="l00075"></a>00075 cum = 0;
<a name="l00076"></a>00076 cshift = 0;
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <span class="comment">/* Determine how many bits we can scale t up by below. */</span>
<a name="l00079"></a>00079 <span class="keywordflow">for</span> (tscale = 0; tscale < 32; ++tscale)
<a name="l00080"></a>00080 <span class="keywordflow">if</span> (ndiff & (1<<(31-tscale)))
<a name="l00081"></a>00081 <span class="keywordflow">break</span>;
<a name="l00082"></a>00082 --tscale; <span class="comment">/* Avoid teh overflowz. */</span>
<a name="l00083"></a>00083 <span class="comment">/* printf("tscale is %d (ndiff - 1) << tscale is %d\n",</span>
<a name="l00084"></a>00084 <span class="comment"> tscale, (ndiff-1) << tscale); */</span>
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="comment">/* Somewhat elaborate block floating point implementation.</span>
<a name="l00087"></a>00087 <span class="comment"> * The fp implementation of this is really a lot simpler. */</span>
<a name="l00088"></a>00088 <span class="keywordflow">for</span> (t = 1; t < ndiff; ++t) {
<a name="l00089"></a>00089 uint32 dd, dshift, norm;
<a name="l00090"></a>00090 <span class="keywordtype">int</span> j;
<a name="l00091"></a>00091
<a name="l00092"></a>00092 dd = 0;
<a name="l00093"></a>00093 dshift = 0;
<a name="l00094"></a>00094 <span class="keywordflow">for</span> (j = 0; j < ndiff; ++j) {
<a name="l00095"></a>00095 <span class="keywordtype">int</span> diff = signal[j] - signal[t + j];
<a name="l00096"></a>00096 <span class="comment">/* Guard against overflows. */</span>
<a name="l00097"></a>00097 <span class="keywordflow">if</span> (dd > (1UL<<tscale)) {
<a name="l00098"></a>00098 dd >>= 1;
<a name="l00099"></a>00099 ++dshift;
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101 dd += (diff * diff) >> dshift;
<a name="l00102"></a>00102 }
<a name="l00103"></a>00103 <span class="comment">/* Make sure the diffs and cum are shifted to the same</span>
<a name="l00104"></a>00104 <span class="comment"> * scaling factor (usually dshift will be zero) */</span>
<a name="l00105"></a>00105 <span class="keywordflow">if</span> (dshift > cshift) {
<a name="l00106"></a>00106 cum += dd << (dshift-cshift);
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108 <span class="keywordflow">else</span> {
<a name="l00109"></a>00109 cum += dd >> (cshift-dshift);
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="comment">/* Guard against overflows and also ensure that (t<<tscale) > cum. */</span>
<a name="l00113"></a>00113 <span class="keywordflow">while</span> (cum > (1UL<<tscale)) {
<a name="l00114"></a>00114 cum >>= 1;
<a name="l00115"></a>00115 ++cshift;
<a name="l00116"></a>00116 }
<a name="l00117"></a>00117 <span class="comment">/* Avoid divide-by-zero! */</span>
<a name="l00118"></a>00118 <span class="keywordflow">if</span> (cum == 0) cum = 1;
<a name="l00119"></a>00119 <span class="comment">/* Calculate the normalizer in high precision. */</span>
<a name="l00120"></a>00120 norm = (t << tscale) / cum;
<a name="l00121"></a>00121 <span class="comment">/* Do a long multiply and shift down to Q15. */</span>
<a name="l00122"></a>00122 out_diff[t] = (int32)(((<span class="keywordtype">long</span> <span class="keywordtype">long</span>)dd * norm)
<a name="l00123"></a>00123 >> (tscale - 15 + cshift - dshift));
<a name="l00124"></a>00124 <span class="comment">/* printf("dd %d cshift %d dshift %d scaledt %d cum %d norm %d cmn %d\n",</span>
<a name="l00125"></a>00125 <span class="comment"> dd, cshift, dshift, (t<<tscale), cum, norm, out_diff[t]); */</span>
<a name="l00126"></a>00126 }
<a name="l00127"></a>00127 }
<a name="l00128"></a>00128
<a name="l00129"></a>00129 <a class="code" href="structyin__s.html">yin_t</a> *
<a name="l00130"></a><a class="code" href="yin_8c.html#adeaf7df902787daf9fa9d7453798c01e">00130</a> <a class="code" href="yin_8h.html#afc3a955f8d2215ed3d660737643c4f32" title="Initialize moving-window pitch estimation.">yin_init</a>(<span class="keywordtype">int</span> frame_size, <span class="keywordtype">float</span> search_threshold,
<a name="l00131"></a>00131 <span class="keywordtype">float</span> search_range, <span class="keywordtype">int</span> smooth_window)
<a name="l00132"></a>00132 {
<a name="l00133"></a>00133 <a class="code" href="structyin__s.html">yin_t</a> *pe;
<a name="l00134"></a>00134
<a name="l00135"></a>00135 pe = <a class="code" href="ckd__alloc_8h.html#aa00ef21903bc4f8a972488417adc8d2e" title="Macros to simplify the use of above functions.">ckd_calloc</a>(1, <span class="keyword">sizeof</span>(*pe));
<a name="l00136"></a>00136 pe->frame_size = frame_size;
<a name="l00137"></a>00137 pe-><a class="code" href="structyin__s.html#a8cca938167af6b504458ff9578420afd" title="Size of analysis frame.">search_threshold</a> = (uint16)(search_threshold * 32768);
<a name="l00138"></a>00138 pe-><a class="code" href="structyin__s.html#a208dfba1535fdd31962e687d82913dfd" title="Range around best local estimate to search, in Q15.">search_range</a> = (uint16)(search_range * 32768);
<a name="l00139"></a>00139 pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a> = smooth_window * 2 + 1;
<a name="l00140"></a>00140 pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a> = <a class="code" href="ckd__alloc_8h.html#a949e7b50fcd9697b1563fa57f50e9c4f" title="Macro for __ckd_calloc_2d__.">ckd_calloc_2d</a>(pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>,
<a name="l00141"></a>00141 pe->frame_size / 2,
<a name="l00142"></a>00142 <span class="keyword">sizeof</span>(**pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>));
<a name="l00143"></a>00143 pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a> = <a class="code" href="ckd__alloc_8h.html#aa00ef21903bc4f8a972488417adc8d2e" title="Macros to simplify the use of above functions.">ckd_calloc</a>(pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>,
<a name="l00144"></a>00144 <span class="keyword">sizeof</span>(*pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>));
<a name="l00145"></a>00145 <span class="keywordflow">return</span> pe;
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147
<a name="l00148"></a>00148 <span class="keywordtype">void</span>
<a name="l00149"></a><a class="code" href="yin_8c.html#a98f2ed13316b8ab9bf93feb4b6d3e7bd">00149</a> <a class="code" href="yin_8h.html#ae587e0d984966c482f21ee4cb0952dd0" title="Free a moving-window pitch estimator.">yin_free</a>(<a class="code" href="structyin__s.html">yin_t</a> *pe)
<a name="l00150"></a>00150 {
<a name="l00151"></a>00151 <a class="code" href="ckd__alloc_8h.html#a8246c071ac12e98b7e1df9fe6da15aef" title="Free a 2-D array (ptr) previously allocated by ckd_calloc_2d.">ckd_free_2d</a>(pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>);
<a name="l00152"></a>00152 <a class="code" href="ckd__alloc_8h.html#a31c6b405558620ac37599737b5722fbf" title="Test and free a 1-D array.">ckd_free</a>(pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>);
<a name="l00153"></a>00153 <a class="code" href="ckd__alloc_8h.html#a31c6b405558620ac37599737b5722fbf" title="Test and free a 1-D array.">ckd_free</a>(pe);
<a name="l00154"></a>00154 }
<a name="l00155"></a>00155
<a name="l00156"></a>00156 <span class="keywordtype">void</span>
<a name="l00157"></a><a class="code" href="yin_8c.html#aedb765d2c9f8f9d96f90b4971ed0f649">00157</a> <a class="code" href="yin_8h.html#a9a93d7c0fd3eb97d8ea735a76683ff4d" title="Start processing an utterance.">yin_start</a>(<a class="code" href="structyin__s.html">yin_t</a> *pe)
<a name="l00158"></a>00158 {
<a name="l00159"></a>00159 <span class="comment">/* Reset the circular window pointers. */</span>
<a name="l00160"></a>00160 pe-><a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e" title="First frame in window.">wstart</a> = pe-><a class="code" href="structyin__s.html#a61ca0fc8444a1bdde10aca37dc9f0f56" title="Hoch Hech! Are we at the utterance end?">endut</a> = 0;
<a name="l00161"></a>00161 pe-><a class="code" href="structyin__s.html#af4f11d14a36bbdc19863fa8335237423" title="Number of frames read so far.">nfr</a> = 0;
<a name="l00162"></a>00162 }
<a name="l00163"></a>00163
<a name="l00164"></a>00164 <span class="keywordtype">void</span>
<a name="l00165"></a><a class="code" href="yin_8c.html#abfe51d8b596f85941831b2727e49c181">00165</a> <a class="code" href="yin_8h.html#a9182cabf44e517c2db3b67edacebece9" title="Mark the end of an utterance.">yin_end</a>(<a class="code" href="structyin__s.html">yin_t</a> *pe)
<a name="l00166"></a>00166 {
<a name="l00167"></a>00167 pe-><a class="code" href="structyin__s.html#a61ca0fc8444a1bdde10aca37dc9f0f56" title="Hoch Hech! Are we at the utterance end?">endut</a> = 1;
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169
<a name="l00170"></a>00170 <span class="keywordtype">int</span>
<a name="l00171"></a>00171 thresholded_search(int32 *diff_window, fixed32 threshold, <span class="keywordtype">int</span> start, <span class="keywordtype">int</span> end)
<a name="l00172"></a>00172 {
<a name="l00173"></a>00173 <span class="keywordtype">int</span> i, min, argmin;
<a name="l00174"></a>00174
<a name="l00175"></a>00175 min = INT_MAX;
<a name="l00176"></a>00176 argmin = 0;
<a name="l00177"></a>00177 <span class="keywordflow">for</span> (i = start; i < end; ++i) {
<a name="l00178"></a>00178 <span class="keywordtype">int</span> diff = diff_window[i];
<a name="l00179"></a>00179
<a name="l00180"></a>00180 <span class="keywordflow">if</span> (diff < threshold) {
<a name="l00181"></a>00181 min = diff;
<a name="l00182"></a>00182 argmin = i;
<a name="l00183"></a>00183 <span class="keywordflow">break</span>;
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185 <span class="keywordflow">if</span> (diff < min) {
<a name="l00186"></a>00186 min = diff;
<a name="l00187"></a>00187 argmin = i;
<a name="l00188"></a>00188 }
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190 <span class="keywordflow">return</span> argmin;
<a name="l00191"></a>00191 }
<a name="l00192"></a>00192
<a name="l00193"></a>00193 <span class="keywordtype">void</span>
<a name="l00194"></a><a class="code" href="yin_8c.html#ae272b1d9ce8ad45f69eb8b5f98f305b6">00194</a> <a class="code" href="yin_8h.html#ac316a9b80593ad996df71b0f6df54d6c" title="Feed a frame of data to the pitch estimator.">yin_write</a>(<a class="code" href="structyin__s.html">yin_t</a> *pe, int16 <span class="keyword">const</span> *frame)
<a name="l00195"></a>00195 {
<a name="l00196"></a>00196 <span class="keywordtype">int</span> outptr, difflen;
<a name="l00197"></a>00197
<a name="l00198"></a>00198 <span class="comment">/* Rotate the window one frame forward. */</span>
<a name="l00199"></a>00199 ++pe-><a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e" title="First frame in window.">wstart</a>;
<a name="l00200"></a>00200 <span class="comment">/* Fill in the frame before wstart. */</span>
<a name="l00201"></a>00201 outptr = pe-><a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e" title="First frame in window.">wstart</a> - 1;
<a name="l00202"></a>00202 <span class="comment">/* Wrap around the window pointer. */</span>
<a name="l00203"></a>00203 <span class="keywordflow">if</span> (pe-><a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e" title="First frame in window.">wstart</a> == pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>)
<a name="l00204"></a>00204 pe-><a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e" title="First frame in window.">wstart</a> = 0;
<a name="l00205"></a>00205
<a name="l00206"></a>00206 <span class="comment">/* Now calculate normalized difference function. */</span>
<a name="l00207"></a>00207 difflen = pe->frame_size / 2;
<a name="l00208"></a>00208 cmn_diff(frame, pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>[outptr], difflen);
<a name="l00209"></a>00209
<a name="l00210"></a>00210 <span class="comment">/* Find the first point under threshold. If not found, then</span>
<a name="l00211"></a>00211 <span class="comment"> * use the absolute minimum. */</span>
<a name="l00212"></a>00212 pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>[outptr]
<a name="l00213"></a>00213 = thresholded_search(pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>[outptr],
<a name="l00214"></a>00214 pe-><a class="code" href="structyin__s.html#a8cca938167af6b504458ff9578420afd" title="Size of analysis frame.">search_threshold</a>, 0, difflen);
<a name="l00215"></a>00215
<a name="l00216"></a>00216 <span class="comment">/* Increment total number of frames. */</span>
<a name="l00217"></a>00217 ++pe-><a class="code" href="structyin__s.html#af4f11d14a36bbdc19863fa8335237423" title="Number of frames read so far.">nfr</a>;
<a name="l00218"></a>00218 }
<a name="l00219"></a>00219
<a name="l00220"></a>00220 <span class="keywordtype">int</span>
<a name="l00221"></a><a class="code" href="yin_8c.html#a5d4ceba1aed1fcc8e10f6408a271b294">00221</a> <a class="code" href="yin_8h.html#a3a0ae5d5a543b9e71b34c9b4a285bdbf" title="Read a raw estimated pitch value from the pitch estimator.">yin_read</a>(<a class="code" href="structyin__s.html">yin_t</a> *pe, uint16 *out_period, uint16 *out_bestdiff)
<a name="l00222"></a>00222 {
<a name="l00223"></a>00223 <span class="keywordtype">int</span> wstart, wlen, half_wsize, i;
<a name="l00224"></a>00224 <span class="keywordtype">int</span> best, best_diff, search_width, low_period, high_period;
<a name="l00225"></a>00225
<a name="l00226"></a>00226 half_wsize = (pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>-1)/2;
<a name="l00227"></a>00227 <span class="comment">/* Without any smoothing, just return the current value (don't</span>
<a name="l00228"></a>00228 <span class="comment"> * need to do anything to the current poitner either). */</span>
<a name="l00229"></a>00229 <span class="keywordflow">if</span> (half_wsize == 0) {
<a name="l00230"></a>00230 <span class="keywordflow">if</span> (pe-><a class="code" href="structyin__s.html#a61ca0fc8444a1bdde10aca37dc9f0f56" title="Hoch Hech! Are we at the utterance end?">endut</a>)
<a name="l00231"></a>00231 <span class="keywordflow">return</span> 0;
<a name="l00232"></a>00232 *out_period = pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>[0];
<a name="l00233"></a>00233 *out_bestdiff = pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>[0][pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>[0]];
<a name="l00234"></a>00234 <span class="keywordflow">return</span> 1;
<a name="l00235"></a>00235 }
<a name="l00236"></a>00236
<a name="l00237"></a>00237 <span class="comment">/* We can't do anything unless we have at least (wsize-1)/2 + 1</span>
<a name="l00238"></a>00238 <span class="comment"> * frames, unless we're at the end of the utterance. */</span>
<a name="l00239"></a>00239 <span class="keywordflow">if</span> (pe-><a class="code" href="structyin__s.html#a61ca0fc8444a1bdde10aca37dc9f0f56" title="Hoch Hech! Are we at the utterance end?">endut</a> == 0 && pe-><a class="code" href="structyin__s.html#af4f11d14a36bbdc19863fa8335237423" title="Number of frames read so far.">nfr</a> < half_wsize + 1) {
<a name="l00240"></a>00240 <span class="comment">/* Don't increment the current pointer either. */</span>
<a name="l00241"></a>00241 <span class="keywordflow">return</span> 0;
<a name="l00242"></a>00242 }
<a name="l00243"></a>00243
<a name="l00244"></a>00244 <span class="comment">/* Establish the smoothing window. */</span>
<a name="l00245"></a>00245 <span class="comment">/* End of utterance. */</span>
<a name="l00246"></a>00246 <span class="keywordflow">if</span> (pe-><a class="code" href="structyin__s.html#a61ca0fc8444a1bdde10aca37dc9f0f56" title="Hoch Hech! Are we at the utterance end?">endut</a>) {
<a name="l00247"></a>00247 <span class="comment">/* We are done (no more data) when pe->wcur = pe->wstart. */</span>
<a name="l00248"></a>00248 <span class="keywordflow">if</span> (pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a> == pe-><a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e" title="First frame in window.">wstart</a>)
<a name="l00249"></a>00249 <span class="keywordflow">return</span> 0;
<a name="l00250"></a>00250 <span class="comment">/* I.e. pe->wcur (circular minus) half_wsize. */</span>
<a name="l00251"></a>00251 wstart = (pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a> + pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a> - half_wsize) % pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>;
<a name="l00252"></a>00252 <span class="comment">/* Number of frames from wstart up to pe->wstart. */</span>
<a name="l00253"></a>00253 wlen = pe-><a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e" title="First frame in window.">wstart</a> - wstart;
<a name="l00254"></a>00254 if (wlen < 0) wlen += pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>;
<a name="l00255"></a>00255 <span class="comment">/*printf("ENDUT! ");*/</span>
<a name="l00256"></a>00256 }
<a name="l00257"></a>00257 <span class="comment">/* Beginning of utterance. */</span>
<a name="l00258"></a>00258 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (pe-><a class="code" href="structyin__s.html#af4f11d14a36bbdc19863fa8335237423" title="Number of frames read so far.">nfr</a> < pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>) {
<a name="l00259"></a>00259 wstart = 0;
<a name="l00260"></a>00260 wlen = pe-><a class="code" href="structyin__s.html#af4f11d14a36bbdc19863fa8335237423" title="Number of frames read so far.">nfr</a>;
<a name="l00261"></a>00261 }
<a name="l00262"></a>00262 <span class="comment">/* Normal case, it is what it is. */</span>
<a name="l00263"></a>00263 <span class="keywordflow">else</span> {
<a name="l00264"></a>00264 wstart = pe-><a class="code" href="structyin__s.html#a18481851da6db4df2a469b80c2c5704e" title="First frame in window.">wstart</a>;
<a name="l00265"></a>00265 wlen = pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>;
<a name="l00266"></a>00266 }
<a name="l00267"></a>00267
<a name="l00268"></a>00268 <span class="comment">/* Now (finally) look for the best local estimate. */</span>
<a name="l00269"></a>00269 <span class="comment">/* printf("Searching for local estimate in %d frames around %d\n",</span>
<a name="l00270"></a>00270 <span class="comment"> wlen, pe->nfr + 1 - wlen); */</span>
<a name="l00271"></a>00271 best = pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>[pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a>];
<a name="l00272"></a>00272 best_diff = pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>[pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a>][best];
<a name="l00273"></a>00273 <span class="keywordflow">for</span> (i = 0; i < wlen; ++i) {
<a name="l00274"></a>00274 <span class="keywordtype">int</span> j = wstart + i;
<a name="l00275"></a>00275 <span class="keywordtype">int</span> diff;
<a name="l00276"></a>00276
<a name="l00277"></a>00277 j %= pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>;
<a name="l00278"></a>00278 diff = pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>[j][pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>[j]];
<a name="l00279"></a>00279 <span class="comment">/* printf("%.2f,%.2f ", 1.0 - (double)diff/32768,</span>
<a name="l00280"></a>00280 <span class="comment"> pe->period_window[j] ? 8000.0/pe->period_window[j] : 8000.0); */</span>
<a name="l00281"></a>00281 <span class="keywordflow">if</span> (diff < best_diff) {
<a name="l00282"></a>00282 best_diff = diff;
<a name="l00283"></a>00283 best = pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>[j];
<a name="l00284"></a>00284 }
<a name="l00285"></a>00285 }
<a name="l00286"></a>00286 <span class="comment">/* printf("best: %.2f, %.2f\n", 1.0 - (double)best_diff/32768,</span>
<a name="l00287"></a>00287 <span class="comment"> best ? 8000.0/best : 8000.0); */</span>
<a name="l00288"></a>00288 <span class="comment">/* If it's the same as the current one then return it. */</span>
<a name="l00289"></a>00289 <span class="keywordflow">if</span> (best == pe-><a class="code" href="structyin__s.html#a1928cec127e250f6cd15249085bc9fc8" title="Window of best period estimates.">period_window</a>[pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a>]) {
<a name="l00290"></a>00290 <span class="comment">/* Increment the current pointer. */</span>
<a name="l00291"></a>00291 <span class="keywordflow">if</span> (++pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a> == pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>)
<a name="l00292"></a>00292 pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a> = 0;
<a name="l00293"></a>00293 *out_period = best;
<a name="l00294"></a>00294 *out_bestdiff = best_diff;
<a name="l00295"></a>00295 <span class="keywordflow">return</span> 1;
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297 <span class="comment">/* Otherwise, redo the search inside a narrower range. */</span>
<a name="l00298"></a>00298 search_width = best * pe-><a class="code" href="structyin__s.html#a208dfba1535fdd31962e687d82913dfd" title="Range around best local estimate to search, in Q15.">search_range</a> / 32768;
<a name="l00299"></a>00299 <span class="comment">/* printf("Search width = %d * %.2f = %d\n",</span>
<a name="l00300"></a>00300 <span class="comment"> best, (double)pe->search_range/32768, search_width); */</span>
<a name="l00301"></a>00301 <span class="keywordflow">if</span> (search_width == 0) search_width = 1;
<a name="l00302"></a>00302 low_period = best - search_width;
<a name="l00303"></a>00303 high_period = best + search_width;
<a name="l00304"></a>00304 <span class="keywordflow">if</span> (low_period < 0) low_period = 0;
<a name="l00305"></a>00305 <span class="keywordflow">if</span> (high_period > pe->frame_size / 2) high_period = pe->frame_size / 2;
<a name="l00306"></a>00306 <span class="comment">/* printf("Searching from %d to %d\n", low_period, high_period); */</span>
<a name="l00307"></a>00307 best = thresholded_search(pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>[pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a>],
<a name="l00308"></a>00308 pe-><a class="code" href="structyin__s.html#a8cca938167af6b504458ff9578420afd" title="Size of analysis frame.">search_threshold</a>,
<a name="l00309"></a>00309 low_period, high_period);
<a name="l00310"></a>00310 best_diff = pe-><a class="code" href="structyin__s.html#a932e8441ff0aa6b9b37f5055c97a4d11" title="Window of difference function outputs.">diff_window</a>[pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a>][best];
<a name="l00311"></a>00311
<a name="l00312"></a>00312 <span class="keywordflow">if</span> (out_period)
<a name="l00313"></a>00313 *out_period = (best > 65535) ? 65535 : best;
<a name="l00314"></a>00314 <span class="keywordflow">if</span> (out_bestdiff)
<a name="l00315"></a>00315 *out_bestdiff = (best_diff > 65535) ? 65535 : best_diff;
<a name="l00316"></a>00316
<a name="l00317"></a>00317 <span class="comment">/* Increment the current pointer. */</span>
<a name="l00318"></a>00318 <span class="keywordflow">if</span> (++pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a> == pe-><a class="code" href="structyin__s.html#a024d8e9d70f94a7f62457154fb5a4b03" title="Size of smoothing window.">wsize</a>)
<a name="l00319"></a>00319 pe-><a class="code" href="structyin__s.html#ab79376deb3761d5d3ae72f727ac25660" title="Current frame of analysis.">wcur</a> = 0;
<a name="l00320"></a>00320 <span class="keywordflow">return</span> 1;
<a name="l00321"></a>00321 }
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