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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.5"/> <title>ALSA project - the C library reference: /test/latency.c</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="search/search.js"></script> <script type="text/javascript"> $(document).ready(function() { searchBox.OnSelectItem(0); }); </script> <link href="doxygen.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td style="padding-left: 0.5em;"> <div id="projectname">ALSA project - the C library reference </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.5 --> <script type="text/javascript"> var searchBox = new SearchBox("searchBox", "search",false,'Search'); </script> <div id="navrow1" class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li><a href="files.html"><span>Files</span></a></li> <li><a href="examples.html"><span>Examples</span></a></li> <li> <div id="MSearchBox" class="MSearchBoxInactive"> <span class="left"> <img id="MSearchSelect" src="search/mag_sel.png" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" alt=""/> <input type="text" id="MSearchField" value="Search" accesskey="S" onfocus="searchBox.OnSearchFieldFocus(true)" onblur="searchBox.OnSearchFieldFocus(false)" onkeyup="searchBox.OnSearchFieldChange(event)"/> </span><span class="right"> <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a> </span> </div> </li> </ul> </div> </div><!-- top --> <!-- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" onkeydown="return searchBox.OnSearchSelectKey(event)"> <a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Macros</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(9)"><span class="SelectionMark"> </span>Groups</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(10)"><span class="SelectionMark"> </span>Pages</a></div> <!-- iframe showing the search results (closed by default) --> <div id="MSearchResultsWindow"> <iframe src="javascript:void(0)" frameborder="0" name="MSearchResults" id="MSearchResults"> </iframe> </div> <div class="header"> <div class="headertitle"> <div class="title">/test/latency.c</div> </div> </div><!--header--> <div class="contents"> <div class="fragment"><div class="line"><span class="comment">/*</span></div> <div class="line"><span class="comment"> * Latency test program</span></div> <div class="line"><span class="comment"> *</span></div> <div class="line"><span class="comment"> * Author: Jaroslav Kysela <perex@perex.cz></span></div> <div class="line"><span class="comment"> *</span></div> <div class="line"><span class="comment"> * Author of bandpass filter sweep effect:</span></div> <div class="line"><span class="comment"> * Maarten de Boer <mdeboer@iua.upf.es></span></div> <div class="line"><span class="comment"> *</span></div> <div class="line"><span class="comment"> * This small demo program can be used for measuring latency between</span></div> <div class="line"><span class="comment"> * capture and playback. This latency is measured from driver (diff when</span></div> <div class="line"><span class="comment"> * playback and capture was started). Scheduler is set to SCHED_RR.</span></div> <div class="line"><span class="comment"> *</span></div> <div class="line"><span class="comment"> *</span></div> <div class="line"><span class="comment"> * This program is free software; you can redistribute it and/or modify</span></div> <div class="line"><span class="comment"> * it under the terms of the GNU General Public License as published by</span></div> <div class="line"><span class="comment"> * the Free Software Foundation; either version 2 of the License, or</span></div> <div class="line"><span class="comment"> * (at your option) any later version.</span></div> <div class="line"><span class="comment"> *</span></div> <div class="line"><span class="comment"> * This program is distributed in the hope that it will be useful,</span></div> <div class="line"><span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div> <div class="line"><span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div> <div class="line"><span class="comment"> * GNU General Public License for more details.</span></div> <div class="line"><span class="comment"> *</span></div> <div class="line"><span class="comment"> * You should have received a copy of the GNU General Public License</span></div> <div class="line"><span class="comment"> * along with this program; if not, write to the Free Software</span></div> <div class="line"><span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span></div> <div class="line"><span class="comment"> *</span></div> <div class="line"><span class="comment"> */</span></div> <div class="line"></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 <sched.h></span></div> <div class="line"><span class="preprocessor">#include <errno.h></span></div> <div class="line"><span class="preprocessor">#include <getopt.h></span></div> <div class="line"><span class="preprocessor">#include "../include/asoundlib.h"</span></div> <div class="line"><span class="preprocessor">#include <sys/time.h></span></div> <div class="line"><span class="preprocessor">#include <math.h></span></div> <div class="line"></div> <div class="line"><span class="keywordtype">char</span> *pdevice = <span class="stringliteral">"hw:0,0"</span>;</div> <div class="line"><span class="keywordtype">char</span> *cdevice = <span class="stringliteral">"hw:0,0"</span>;</div> <div class="line"><a class="code" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> format = <a name="a0"></a><a class="code" href="group___p_c_m.html#ggaa14b7f26877a812acbb39811364177f8a8b66a29293c62df9d1678c609fab76c0">SND_PCM_FORMAT_S16_LE</a>;</div> <div class="line"><span class="keywordtype">int</span> rate = 22050;</div> <div class="line"><span class="keywordtype">int</span> channels = 2;</div> <div class="line"><span class="keywordtype">int</span> buffer_size = 0; <span class="comment">/* auto */</span></div> <div class="line"><span class="keywordtype">int</span> period_size = 0; <span class="comment">/* auto */</span></div> <div class="line"><span class="keywordtype">int</span> latency_min = 32; <span class="comment">/* in frames / 2 */</span></div> <div class="line"><span class="keywordtype">int</span> latency_max = 2048; <span class="comment">/* in frames / 2 */</span></div> <div class="line"><span class="keywordtype">int</span> loop_sec = 30; <span class="comment">/* seconds */</span></div> <div class="line"><span class="keywordtype">int</span> block = 0; <span class="comment">/* block mode */</span></div> <div class="line"><span class="keywordtype">int</span> use_poll = 0;</div> <div class="line"><span class="keywordtype">int</span> resample = 1;</div> <div class="line"><span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> loop_limit;</div> <div class="line"></div> <div class="line"><a class="code" href="group___output.html#ga49729cc6454539495c1f5b6e95cd474a">snd_output_t</a> *output = NULL;</div> <div class="line"></div> <div class="line"><span class="keywordtype">int</span> setparams_stream(<a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *handle,</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga65c737127994f0a980edad744e36dc40">snd_pcm_hw_params_t</a> *params,</div> <div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *<span class="keywordtype">id</span>)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">int</span> err;</div> <div class="line"> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> rrate;</div> <div class="line"></div> <div class="line"> err = <a name="a1"></a><a class="code" href="group___p_c_m___h_w___params.html#ga6e2dd8efbb7a4084bd05e6cc458d84f7">snd_pcm_hw_params_any</a>(handle, params);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Broken configuration for %s PCM: no configurations available: %s\n"</span>, <a name="a2"></a><a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err), <span class="keywordtype">id</span>);</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> err = <a name="a3"></a><a class="code" href="group___p_c_m___h_w___params.html#ga82eecc0e27a94ce0caa195cc3765536c">snd_pcm_hw_params_set_rate_resample</a>(handle, params, resample);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Resample setup failed for %s (val %i): %s\n"</span>, <span class="keywordtype">id</span>, resample, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> err = <a name="a4"></a><a class="code" href="group___p_c_m___h_w___params.html#ga4c8f1c632931923531ca68ee048a8de8">snd_pcm_hw_params_set_access</a>(handle, params, <a name="a5"></a><a class="code" href="group___p_c_m.html#gga661221ba5e8f1d6eaf4ab8e2da57cc1aa72a970ed6e676ab0fd9f3c3d36737e0a">SND_PCM_ACCESS_RW_INTERLEAVED</a>);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Access type not available for %s: %s\n"</span>, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> err = <a name="a6"></a><a class="code" href="group___p_c_m___h_w___params.html#ga6014e0e1ec7934f8c745290e83e59199">snd_pcm_hw_params_set_format</a>(handle, params, format);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Sample format not available for %s: %s\n"</span>, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> err = <a name="a7"></a><a class="code" href="group___p_c_m___h_w___params.html#ga3a5b2a05c5d9869cc743dac71c0d270a">snd_pcm_hw_params_set_channels</a>(handle, params, channels);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Channels count (%i) not available for %s: %s\n"</span>, channels, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> rrate = rate;</div> <div class="line"> err = <a name="a8"></a><a class="code" href="group___p_c_m___h_w___params.html#ga39124280d06ce63092a77e3f25ddd6ee">snd_pcm_hw_params_set_rate_near</a>(handle, params, &rrate, 0);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Rate %iHz not available for %s: %s\n"</span>, rate, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> ((<span class="keywordtype">int</span>)rrate != rate) {</div> <div class="line"> printf(<span class="stringliteral">"Rate doesn't match (requested %iHz, get %iHz)\n"</span>, rate, err);</div> <div class="line"> <span class="keywordflow">return</span> -EINVAL;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">int</span> setparams_bufsize(<a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *handle,</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga65c737127994f0a980edad744e36dc40">snd_pcm_hw_params_t</a> *params,</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga65c737127994f0a980edad744e36dc40">snd_pcm_hw_params_t</a> *tparams,</div> <div class="line"> <a class="code" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> bufsize,</div> <div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *<span class="keywordtype">id</span>)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">int</span> err;</div> <div class="line"> <a class="code" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> periodsize;</div> <div class="line"></div> <div class="line"> <a name="a9"></a><a class="code" href="group___p_c_m___h_w___params.html#ga9bcedf4bb4b21527a584846a5986a1f4">snd_pcm_hw_params_copy</a>(params, tparams);</div> <div class="line"> periodsize = bufsize * 2;</div> <div class="line"> err = <a name="a10"></a><a class="code" href="group___p_c_m___h_w___params.html#ga2c00cb635d374030595dbc27b7a983a7">snd_pcm_hw_params_set_buffer_size_near</a>(handle, params, &periodsize);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set buffer size %li for %s: %s\n"</span>, bufsize * 2, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> (period_size > 0)</div> <div class="line"> periodsize = period_size;</div> <div class="line"> <span class="keywordflow">else</span></div> <div class="line"> periodsize /= 2;</div> <div class="line"> err = <a name="a11"></a><a class="code" href="group___p_c_m___h_w___params.html#ga9162045265f283c532634506456cab09">snd_pcm_hw_params_set_period_size_near</a>(handle, params, &periodsize, 0);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set period size %li for %s: %s\n"</span>, periodsize, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">int</span> setparams_set(<a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *handle,</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga65c737127994f0a980edad744e36dc40">snd_pcm_hw_params_t</a> *params,</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga7e082d9ea701709270b0674a0be23b09">snd_pcm_sw_params_t</a> *swparams,</div> <div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *<span class="keywordtype">id</span>)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">int</span> err;</div> <div class="line"> <a class="code" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> val;</div> <div class="line"></div> <div class="line"> err = <a name="a12"></a><a class="code" href="group___p_c_m.html#ga1ca0dc120a484965e26cabf966502330">snd_pcm_hw_params</a>(handle, params);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set hw params for %s: %s\n"</span>, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> err = <a name="a13"></a><a class="code" href="group___p_c_m.html#ga61c5495ffb44c75aaa595e85512d28de">snd_pcm_sw_params_current</a>(handle, swparams);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to determine current swparams for %s: %s\n"</span>, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> err = <a name="a14"></a><a class="code" href="group___p_c_m___s_w___params.html#ga1d338f1f7e33b7a6d0f9a8f61f87f057">snd_pcm_sw_params_set_start_threshold</a>(handle, swparams, 0x7fffffff);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set start threshold mode for %s: %s\n"</span>, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> (!block)</div> <div class="line"> val = 4;</div> <div class="line"> <span class="keywordflow">else</span></div> <div class="line"> <a name="a15"></a><a class="code" href="group___p_c_m___h_w___params.html#gaba48ea189171536f9793e0d99e6db5e0">snd_pcm_hw_params_get_period_size</a>(params, &val, NULL);</div> <div class="line"> err = <a name="a16"></a><a class="code" href="group___p_c_m___s_w___params.html#ga79b12cbbd309750156261e7f5a39167b">snd_pcm_sw_params_set_avail_min</a>(handle, swparams, val);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set avail min for %s: %s\n"</span>, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> err = <a name="a17"></a><a class="code" href="group___p_c_m.html#ga891ccaeea2c685a533b61b5fa0493974">snd_pcm_sw_params</a>(handle, swparams);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set sw params for %s: %s\n"</span>, <span class="keywordtype">id</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> err;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">int</span> setparams(<a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *phandle, <a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *chandle, <span class="keywordtype">int</span> *bufsize)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">int</span> err, last_bufsize = *bufsize;</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga65c737127994f0a980edad744e36dc40">snd_pcm_hw_params_t</a> *pt_params, *ct_params; <span class="comment">/* templates with rate, format and channels */</span></div> <div class="line"> <a class="code" href="group___p_c_m.html#ga65c737127994f0a980edad744e36dc40">snd_pcm_hw_params_t</a> *p_params, *c_params;</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga7e082d9ea701709270b0674a0be23b09">snd_pcm_sw_params_t</a> *p_swparams, *c_swparams;</div> <div class="line"> <a class="code" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> p_size, c_size, p_psize, c_psize;</div> <div class="line"> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> p_time, c_time;</div> <div class="line"> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> val;</div> <div class="line"></div> <div class="line"> <a name="a18"></a><a class="code" href="group___p_c_m___h_w___params.html#ga06b83cb9a788f99b7b09b570b4355cee">snd_pcm_hw_params_alloca</a>(&p_params);</div> <div class="line"> <a class="code" href="group___p_c_m___h_w___params.html#ga06b83cb9a788f99b7b09b570b4355cee">snd_pcm_hw_params_alloca</a>(&c_params);</div> <div class="line"> <a class="code" href="group___p_c_m___h_w___params.html#ga06b83cb9a788f99b7b09b570b4355cee">snd_pcm_hw_params_alloca</a>(&pt_params);</div> <div class="line"> <a class="code" href="group___p_c_m___h_w___params.html#ga06b83cb9a788f99b7b09b570b4355cee">snd_pcm_hw_params_alloca</a>(&ct_params);</div> <div class="line"> <a name="a19"></a><a class="code" href="group___p_c_m___s_w___params.html#ga8e564553bdc89948c918729e3cc7beb0">snd_pcm_sw_params_alloca</a>(&p_swparams);</div> <div class="line"> <a class="code" href="group___p_c_m___s_w___params.html#ga8e564553bdc89948c918729e3cc7beb0">snd_pcm_sw_params_alloca</a>(&c_swparams);</div> <div class="line"> <span class="keywordflow">if</span> ((err = setparams_stream(phandle, pt_params, <span class="stringliteral">"playback"</span>)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set parameters for playback stream: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> ((err = setparams_stream(chandle, ct_params, <span class="stringliteral">"capture"</span>)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set parameters for playback stream: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"></div> <div class="line"> <span class="keywordflow">if</span> (buffer_size > 0) {</div> <div class="line"> *bufsize = buffer_size;</div> <div class="line"> <span class="keywordflow">goto</span> __set_it;</div> <div class="line"> }</div> <div class="line"></div> <div class="line"> __again:</div> <div class="line"> <span class="keywordflow">if</span> (buffer_size > 0)</div> <div class="line"> <span class="keywordflow">return</span> -1;</div> <div class="line"> <span class="keywordflow">if</span> (last_bufsize == *bufsize)</div> <div class="line"> *bufsize += 4;</div> <div class="line"> last_bufsize = *bufsize;</div> <div class="line"> <span class="keywordflow">if</span> (*bufsize > latency_max)</div> <div class="line"> <span class="keywordflow">return</span> -1;</div> <div class="line"> __set_it:</div> <div class="line"> <span class="keywordflow">if</span> ((err = setparams_bufsize(phandle, p_params, pt_params, *bufsize, <span class="stringliteral">"playback"</span>)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set sw parameters for playback stream: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> ((err = setparams_bufsize(chandle, c_params, ct_params, *bufsize, <span class="stringliteral">"capture"</span>)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set sw parameters for playback stream: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"></div> <div class="line"> <a class="code" href="group___p_c_m___h_w___params.html#gaba48ea189171536f9793e0d99e6db5e0">snd_pcm_hw_params_get_period_size</a>(p_params, &p_psize, NULL);</div> <div class="line"> <span class="keywordflow">if</span> (p_psize > (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)*bufsize)</div> <div class="line"> *bufsize = p_psize;</div> <div class="line"> <a class="code" href="group___p_c_m___h_w___params.html#gaba48ea189171536f9793e0d99e6db5e0">snd_pcm_hw_params_get_period_size</a>(c_params, &c_psize, NULL);</div> <div class="line"> <span class="keywordflow">if</span> (c_psize > (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)*bufsize)</div> <div class="line"> *bufsize = c_psize;</div> <div class="line"> <a name="a20"></a><a class="code" href="group___p_c_m___h_w___params.html#ga71f5d43bf63dc7292b8b58f17acccf89">snd_pcm_hw_params_get_period_time</a>(p_params, &p_time, NULL);</div> <div class="line"> <a class="code" href="group___p_c_m___h_w___params.html#ga71f5d43bf63dc7292b8b58f17acccf89">snd_pcm_hw_params_get_period_time</a>(c_params, &c_time, NULL);</div> <div class="line"> <span class="keywordflow">if</span> (p_time != c_time)</div> <div class="line"> <span class="keywordflow">goto</span> __again;</div> <div class="line"></div> <div class="line"> <a name="a21"></a><a class="code" href="group___p_c_m___h_w___params.html#gab6556fcaaf926360d2064044a6f6cfb4">snd_pcm_hw_params_get_buffer_size</a>(p_params, &p_size);</div> <div class="line"> <span class="keywordflow">if</span> (p_psize * 2 < p_size) {</div> <div class="line"> <a name="a22"></a><a class="code" href="group___p_c_m___h_w___params.html#ga17f3826360b0fe1f47c696388d25ac93">snd_pcm_hw_params_get_periods_min</a>(p_params, &val, NULL);</div> <div class="line"> <span class="keywordflow">if</span> (val > 2) {</div> <div class="line"> printf(<span class="stringliteral">"playback device does not support 2 periods per buffer\n"</span>);</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">goto</span> __again;</div> <div class="line"> }</div> <div class="line"> <a class="code" href="group___p_c_m___h_w___params.html#gab6556fcaaf926360d2064044a6f6cfb4">snd_pcm_hw_params_get_buffer_size</a>(c_params, &c_size);</div> <div class="line"> <span class="keywordflow">if</span> (c_psize * 2 < c_size) {</div> <div class="line"> <a class="code" href="group___p_c_m___h_w___params.html#ga17f3826360b0fe1f47c696388d25ac93">snd_pcm_hw_params_get_periods_min</a>(c_params, &val, NULL);</div> <div class="line"> <span class="keywordflow">if</span> (val > 2 ) {</div> <div class="line"> printf(<span class="stringliteral">"capture device does not support 2 periods per buffer\n"</span>);</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">goto</span> __again;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> ((err = setparams_set(phandle, p_params, p_swparams, <span class="stringliteral">"playback"</span>)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set sw parameters for playback stream: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> ((err = setparams_set(chandle, c_params, c_swparams, <span class="stringliteral">"capture"</span>)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Unable to set sw parameters for playback stream: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"></div> <div class="line"> <span class="keywordflow">if</span> ((err = <a name="a23"></a><a class="code" href="group___p_c_m.html#ga788d05de75f2d536f8443cb0306754d0">snd_pcm_prepare</a>(phandle)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Prepare error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"></div> <div class="line"> <a name="a24"></a><a class="code" href="group___p_c_m___dump.html#ga9c5c879409c504e155e234905d031d8d">snd_pcm_dump</a>(phandle, output);</div> <div class="line"> <a class="code" href="group___p_c_m___dump.html#ga9c5c879409c504e155e234905d031d8d">snd_pcm_dump</a>(chandle, output);</div> <div class="line"> fflush(stdout);</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">void</span> showstat(<a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *handle, <span class="keywordtype">size_t</span> frames)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">int</span> err;</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga902b87281c46910b469d5f7aaafc1890">snd_pcm_status_t</a> *status;</div> <div class="line"></div> <div class="line"> <a name="a25"></a><a class="code" href="group___p_c_m___status.html#ga046c09e5d14b684d9fefd70a12cdde1a">snd_pcm_status_alloca</a>(&status);</div> <div class="line"> <span class="keywordflow">if</span> ((err = <a name="a26"></a><a class="code" href="group___p_c_m.html#ga32891eaac37741728a9b23027012c892">snd_pcm_status</a>(handle, status)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Stream status error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"> printf(<span class="stringliteral">"*** frames = %li ***\n"</span>, (<span class="keywordtype">long</span>)frames);</div> <div class="line"> <a name="a27"></a><a class="code" href="group___p_c_m___dump.html#gaf2427b186609ad502666273342467a51">snd_pcm_status_dump</a>(status, output);</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">void</span> showlatency(<span class="keywordtype">size_t</span> latency)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">double</span> d;</div> <div class="line"> latency *= 2;</div> <div class="line"> d = (double)latency / (<span class="keywordtype">double</span>)rate;</div> <div class="line"> printf(<span class="stringliteral">"Trying latency %li frames, %.3fus, %.6fms (%.4fHz)\n"</span>, (<span class="keywordtype">long</span>)latency, d * 1000000, d * 1000, (<span class="keywordtype">double</span>)1 / d);</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">void</span> showinmax(<span class="keywordtype">size_t</span> in_max)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">double</span> d;</div> <div class="line"></div> <div class="line"> printf(<span class="stringliteral">"Maximum read: %li frames\n"</span>, (<span class="keywordtype">long</span>)in_max);</div> <div class="line"> d = (double)in_max / (<span class="keywordtype">double</span>)rate;</div> <div class="line"> printf(<span class="stringliteral">"Maximum read latency: %.3fus, %.6fms (%.4fHz)\n"</span>, d * 1000000, d * 1000, (<span class="keywordtype">double</span>)1 / d);</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">void</span> gettimestamp(<a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *handle, <a class="code" href="group___global.html#gadd377862d568809fb0e32c9faddf99a4">snd_timestamp_t</a> *timestamp)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">int</span> err;</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga902b87281c46910b469d5f7aaafc1890">snd_pcm_status_t</a> *status;</div> <div class="line"></div> <div class="line"> <a class="code" href="group___p_c_m___status.html#ga046c09e5d14b684d9fefd70a12cdde1a">snd_pcm_status_alloca</a>(&status);</div> <div class="line"> <span class="keywordflow">if</span> ((err = <a class="code" href="group___p_c_m.html#ga32891eaac37741728a9b23027012c892">snd_pcm_status</a>(handle, status)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Stream status error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"> <a name="a28"></a><a class="code" href="group___p_c_m___status.html#ga5eaeff98814e96c2ffd5f04c95b22c8d">snd_pcm_status_get_trigger_tstamp</a>(status, timestamp);</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">void</span> setscheduler(<span class="keywordtype">void</span>)</div> <div class="line">{</div> <div class="line"> <span class="keyword">struct </span>sched_param sched_param;</div> <div class="line"></div> <div class="line"> <span class="keywordflow">if</span> (sched_getparam(0, &sched_param) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Scheduler getparam failed...\n"</span>);</div> <div class="line"> <span class="keywordflow">return</span>;</div> <div class="line"> }</div> <div class="line"> sched_param.sched_priority = sched_get_priority_max(SCHED_RR);</div> <div class="line"> <span class="keywordflow">if</span> (!sched_setscheduler(0, SCHED_RR, &sched_param)) {</div> <div class="line"> printf(<span class="stringliteral">"Scheduler set to Round Robin with priority %i...\n"</span>, sched_param.sched_priority);</div> <div class="line"> fflush(stdout);</div> <div class="line"> <span class="keywordflow">return</span>;</div> <div class="line"> }</div> <div class="line"> printf(<span class="stringliteral">"!!!Scheduler set to Round Robin with priority %i FAILED!!!\n"</span>, sched_param.sched_priority);</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">long</span> timediff(<a class="code" href="group___global.html#gadd377862d568809fb0e32c9faddf99a4">snd_timestamp_t</a> t1, <a class="code" href="group___global.html#gadd377862d568809fb0e32c9faddf99a4">snd_timestamp_t</a> t2)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">signed</span> <span class="keywordtype">long</span> l;</div> <div class="line"></div> <div class="line"> t1.tv_sec -= t2.tv_sec;</div> <div class="line"> l = (<span class="keywordtype">signed</span> long) t1.tv_usec - (<span class="keywordtype">signed</span> <span class="keywordtype">long</span>) t2.tv_usec;</div> <div class="line"> <span class="keywordflow">if</span> (l < 0) {</div> <div class="line"> t1.tv_sec--;</div> <div class="line"> l = 1000000 + l;</div> <div class="line"> l %= 1000000;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">return</span> (t1.tv_sec * 1000000) + l;</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">long</span> readbuf(<a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *handle, <span class="keywordtype">char</span> *buf, <span class="keywordtype">long</span> <a name="a29"></a><a class="code" href="seq__event_8h.html#a77124bd5f7e31e6fffc19f335da0c23f">len</a>, <span class="keywordtype">size_t</span> *frames, <span class="keywordtype">size_t</span> *max)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">long</span> r;</div> <div class="line"></div> <div class="line"> <span class="keywordflow">if</span> (!block) {</div> <div class="line"> <span class="keywordflow">do</span> {</div> <div class="line"> r = <a name="a30"></a><a class="code" href="group___p_c_m.html#ga4c2c7bd26cf221268d59dc3bbeb9c048">snd_pcm_readi</a>(handle, buf, len);</div> <div class="line"> } <span class="keywordflow">while</span> (r == -EAGAIN);</div> <div class="line"> <span class="keywordflow">if</span> (r > 0) {</div> <div class="line"> *frames += r;</div> <div class="line"> <span class="keywordflow">if</span> ((<span class="keywordtype">long</span>)*max < r)</div> <div class="line"> *max = r;</div> <div class="line"> }</div> <div class="line"> <span class="comment">// printf("read = %li\n", r);</span></div> <div class="line"> } <span class="keywordflow">else</span> {</div> <div class="line"> <span class="keywordtype">int</span> frame_bytes = (<a name="a31"></a><a class="code" href="group___p_c_m___helpers.html#ga8d4e07f2d68cc16f607857ed8a222a29">snd_pcm_format_width</a>(format) / 8) * channels;</div> <div class="line"> <span class="keywordflow">do</span> {</div> <div class="line"> r = <a class="code" href="group___p_c_m.html#ga4c2c7bd26cf221268d59dc3bbeb9c048">snd_pcm_readi</a>(handle, buf, len);</div> <div class="line"> <span class="keywordflow">if</span> (r > 0) {</div> <div class="line"> buf += r * frame_bytes;</div> <div class="line"> len -= r;</div> <div class="line"> *frames += r;</div> <div class="line"> <span class="keywordflow">if</span> ((<span class="keywordtype">long</span>)*max < r)</div> <div class="line"> *max = r;</div> <div class="line"> }</div> <div class="line"> <span class="comment">// printf("r = %li, len = %li\n", r, len);</span></div> <div class="line"> } <span class="keywordflow">while</span> (r >= 1 && len > 0);</div> <div class="line"> }</div> <div class="line"> <span class="comment">// showstat(handle, 0);</span></div> <div class="line"> <span class="keywordflow">return</span> r;</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">long</span> writebuf(<a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *handle, <span class="keywordtype">char</span> *buf, <span class="keywordtype">long</span> len, <span class="keywordtype">size_t</span> *frames)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">long</span> r;</div> <div class="line"> <span class="keywordtype">int</span> frame_bytes = (<a class="code" href="group___p_c_m___helpers.html#ga8d4e07f2d68cc16f607857ed8a222a29">snd_pcm_format_width</a>(format) / 8) * channels;</div> <div class="line"></div> <div class="line"> <span class="keywordflow">while</span> (len > 0) {</div> <div class="line"> r = <a name="a32"></a><a class="code" href="group___p_c_m.html#gabc748a500743713eafa960c7d104ca6f">snd_pcm_writei</a>(handle, buf, len);</div> <div class="line"> <span class="keywordflow">if</span> (r == -EAGAIN)</div> <div class="line"> <span class="keywordflow">continue</span>;</div> <div class="line"> <span class="comment">// printf("write = %li\n", r);</span></div> <div class="line"> <span class="keywordflow">if</span> (r < 0)</div> <div class="line"> <span class="keywordflow">return</span> r;</div> <div class="line"> <span class="comment">// showstat(handle, 0);</span></div> <div class="line"> buf += r * frame_bytes;</div> <div class="line"> len -= r;</div> <div class="line"> *frames += r;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line">}</div> <div class="line"> </div> <div class="line"><span class="preprocessor">#define FILTERSWEEP_LFO_CENTER 2000.</span></div> <div class="line"><span class="preprocessor"></span><span class="preprocessor">#define FILTERSWEEP_LFO_DEPTH 1800.</span></div> <div class="line"><span class="preprocessor"></span><span class="preprocessor">#define FILTERSWEEP_LFO_FREQ 0.2</span></div> <div class="line"><span class="preprocessor"></span><span class="preprocessor">#define FILTER_BANDWIDTH 50</span></div> <div class="line"><span class="preprocessor"></span></div> <div class="line"><span class="comment">/* filter the sweep variables */</span></div> <div class="line"><span class="keywordtype">float</span> lfo,dlfo,fs,fc,BW,C,D,a0,a1,a2,b1,b2,*x[3],*y[3];</div> <div class="line"></div> <div class="line"><span class="keywordtype">void</span> applyeffect(<span class="keywordtype">char</span>* buffer,<span class="keywordtype">int</span> r)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">short</span>* samples = (<span class="keywordtype">short</span>*) buffer;</div> <div class="line"> <span class="keywordtype">int</span> i;</div> <div class="line"> <span class="keywordflow">for</span> (i=0;i<r;i++)</div> <div class="line"> {</div> <div class="line"> <span class="keywordtype">int</span> chn;</div> <div class="line"></div> <div class="line"> fc = sin(lfo)*FILTERSWEEP_LFO_DEPTH+FILTERSWEEP_LFO_CENTER;</div> <div class="line"> lfo += dlfo;</div> <div class="line"> <span class="keywordflow">if</span> (lfo>2.*M_PI) lfo -= 2.*M_PI;</div> <div class="line"> C = 1./tan(M_PI*BW/fs);</div> <div class="line"> D = 2.*cos(2*M_PI*fc/fs);</div> <div class="line"> a0 = 1./(1.+C);</div> <div class="line"> a1 = 0;</div> <div class="line"> a2 = -a0;</div> <div class="line"> b1 = -C*D*a0;</div> <div class="line"> b2 = (C-1)*a0;</div> <div class="line"></div> <div class="line"> <span class="keywordflow">for</span> (chn=0;chn<channels;chn++)</div> <div class="line"> {</div> <div class="line"> x[chn][2] = x[chn][1];</div> <div class="line"> x[chn][1] = x[chn][0];</div> <div class="line"></div> <div class="line"> y[chn][2] = y[chn][1];</div> <div class="line"> y[chn][1] = y[chn][0];</div> <div class="line"></div> <div class="line"> x[chn][0] = samples[i*channels+chn];</div> <div class="line"> y[chn][0] = a0*x[chn][0] + a1*x[chn][1] + a2*x[chn][2] </div> <div class="line"> - b1*y[chn][1] - b2*y[chn][2];</div> <div class="line"> samples[i*channels+chn] = y[chn][0];</div> <div class="line"> }</div> <div class="line"> }</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">void</span> help(<span class="keywordtype">void</span>)</div> <div class="line">{</div> <div class="line"> <span class="keywordtype">int</span> k;</div> <div class="line"> printf(</div> <div class="line"><span class="stringliteral">"Usage: latency [OPTION]... [FILE]...\n"</span></div> <div class="line"><span class="stringliteral">"-h,--help help\n"</span></div> <div class="line"><span class="stringliteral">"-P,--pdevice playback device\n"</span></div> <div class="line"><span class="stringliteral">"-C,--cdevice capture device\n"</span></div> <div class="line"><span class="stringliteral">"-m,--min minimum latency in frames\n"</span></div> <div class="line"><span class="stringliteral">"-M,--max maximum latency in frames\n"</span></div> <div class="line"><span class="stringliteral">"-F,--frames frames to transfer\n"</span></div> <div class="line"><span class="stringliteral">"-f,--format sample format\n"</span></div> <div class="line"><span class="stringliteral">"-c,--channels channels\n"</span></div> <div class="line"><span class="stringliteral">"-r,--rate rate\n"</span></div> <div class="line"><span class="stringliteral">"-B,--buffer buffer size in frames\n"</span></div> <div class="line"><span class="stringliteral">"-E,--period period size in frames\n"</span></div> <div class="line"><span class="stringliteral">"-s,--seconds duration of test in seconds\n"</span></div> <div class="line"><span class="stringliteral">"-b,--block block mode\n"</span></div> <div class="line"><span class="stringliteral">"-p,--poll use poll (wait for event - reduces CPU usage)\n"</span></div> <div class="line"><span class="stringliteral">"-e,--effect apply an effect (bandpass filter sweep)\n"</span></div> <div class="line">);</div> <div class="line"> printf(<span class="stringliteral">"Recognized sample formats are:"</span>);</div> <div class="line"> <span class="keywordflow">for</span> (k = 0; k < SND_PCM_FORMAT_LAST; ++k) {</div> <div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *s = <a name="a33"></a><a class="code" href="group___p_c_m___description.html#ga2ca258b8ac569ca35f283e48d2181e45">snd_pcm_format_name</a>(k);</div> <div class="line"> <span class="keywordflow">if</span> (s)</div> <div class="line"> printf(<span class="stringliteral">" %s"</span>, s);</div> <div class="line"> }</div> <div class="line"> printf(<span class="stringliteral">"\n\n"</span>);</div> <div class="line"> printf(</div> <div class="line"><span class="stringliteral">"Tip #1 (usable latency with large periods, non-blocking mode, good CPU usage,\n"</span></div> <div class="line"><span class="stringliteral">" superb xrun prevention):\n"</span></div> <div class="line"><span class="stringliteral">" latency -m 8192 -M 8192 -t 1 -p\n"</span></div> <div class="line"><span class="stringliteral">"Tip #2 (superb latency, non-blocking mode, but heavy CPU usage):\n"</span></div> <div class="line"><span class="stringliteral">" latency -m 128 -M 128\n"</span></div> <div class="line">);</div> <div class="line">}</div> <div class="line"></div> <div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div> <div class="line">{</div> <div class="line"> <span class="keyword">struct </span>option long_option[] =</div> <div class="line"> {</div> <div class="line"> {<span class="stringliteral">"help"</span>, 0, NULL, <span class="charliteral">'h'</span>},</div> <div class="line"> {<span class="stringliteral">"pdevice"</span>, 1, NULL, <span class="charliteral">'P'</span>},</div> <div class="line"> {<span class="stringliteral">"cdevice"</span>, 1, NULL, <span class="charliteral">'C'</span>},</div> <div class="line"> {<span class="stringliteral">"min"</span>, 1, NULL, <span class="charliteral">'m'</span>},</div> <div class="line"> {<span class="stringliteral">"max"</span>, 1, NULL, <span class="charliteral">'M'</span>},</div> <div class="line"> {<span class="stringliteral">"frames"</span>, 1, NULL, <span class="charliteral">'F'</span>},</div> <div class="line"> {<span class="stringliteral">"format"</span>, 1, NULL, <span class="charliteral">'f'</span>},</div> <div class="line"> {<span class="stringliteral">"channels"</span>, 1, NULL, <span class="charliteral">'c'</span>},</div> <div class="line"> {<span class="stringliteral">"rate"</span>, 1, NULL, <span class="charliteral">'r'</span>},</div> <div class="line"> {<span class="stringliteral">"buffer"</span>, 1, NULL, <span class="charliteral">'B'</span>},</div> <div class="line"> {<span class="stringliteral">"period"</span>, 1, NULL, <span class="charliteral">'E'</span>},</div> <div class="line"> {<span class="stringliteral">"seconds"</span>, 1, NULL, <span class="charliteral">'s'</span>},</div> <div class="line"> {<span class="stringliteral">"block"</span>, 0, NULL, <span class="charliteral">'b'</span>},</div> <div class="line"> {<span class="stringliteral">"poll"</span>, 0, NULL, <span class="charliteral">'p'</span>},</div> <div class="line"> {<span class="stringliteral">"effect"</span>, 0, NULL, <span class="charliteral">'e'</span>},</div> <div class="line"> {NULL, 0, NULL, 0},</div> <div class="line"> };</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *phandle, *chandle;</div> <div class="line"> <span class="keywordtype">char</span> *buffer;</div> <div class="line"> <span class="keywordtype">int</span> err, latency, morehelp;</div> <div class="line"> <span class="keywordtype">int</span> ok;</div> <div class="line"> <a class="code" href="group___global.html#gadd377862d568809fb0e32c9faddf99a4">snd_timestamp_t</a> p_tstamp, c_tstamp;</div> <div class="line"> ssize_t r;</div> <div class="line"> <span class="keywordtype">size_t</span> frames_in, frames_out, in_max;</div> <div class="line"> <span class="keywordtype">int</span> effect = 0;</div> <div class="line"> morehelp = 0;</div> <div class="line"> <span class="keywordflow">while</span> (1) {</div> <div class="line"> <span class="keywordtype">int</span> c;</div> <div class="line"> <span class="keywordflow">if</span> ((c = getopt_long(argc, argv, <span class="stringliteral">"hP:C:m:M:F:f:c:r:B:E:s:bpen"</span>, long_option, NULL)) < 0)</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">switch</span> (c) {</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'h'</span>:</div> <div class="line"> morehelp++;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'P'</span>:</div> <div class="line"> pdevice = strdup(optarg);</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'C'</span>:</div> <div class="line"> cdevice = strdup(optarg);</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'m'</span>:</div> <div class="line"> err = atoi(optarg) / 2;</div> <div class="line"> latency_min = err >= 4 ? err : 4;</div> <div class="line"> <span class="keywordflow">if</span> (latency_max < latency_min)</div> <div class="line"> latency_max = latency_min;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'M'</span>:</div> <div class="line"> err = atoi(optarg) / 2;</div> <div class="line"> latency_max = latency_min > err ? latency_min : err;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'f'</span>:</div> <div class="line"> format = <a name="a34"></a><a class="code" href="group___p_c_m___description.html#ga59f99dd9647315a7312d1f2b6204b7bc">snd_pcm_format_value</a>(optarg);</div> <div class="line"> <span class="keywordflow">if</span> (format == <a name="a35"></a><a class="code" href="group___p_c_m.html#ggaa14b7f26877a812acbb39811364177f8ab1e118ecdccf628639b5c85bc3a48999">SND_PCM_FORMAT_UNKNOWN</a>) {</div> <div class="line"> printf(<span class="stringliteral">"Unknown format, setting to default S16_LE\n"</span>);</div> <div class="line"> format = <a class="code" href="group___p_c_m.html#ggaa14b7f26877a812acbb39811364177f8a8b66a29293c62df9d1678c609fab76c0">SND_PCM_FORMAT_S16_LE</a>;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'c'</span>:</div> <div class="line"> err = atoi(optarg);</div> <div class="line"> channels = err >= 1 && err < 1024 ? err : 1;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'r'</span>:</div> <div class="line"> err = atoi(optarg);</div> <div class="line"> rate = err >= 4000 && err < 200000 ? err : 44100;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'B'</span>:</div> <div class="line"> err = atoi(optarg);</div> <div class="line"> buffer_size = err >= 32 && err < 200000 ? err : 0;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'E'</span>:</div> <div class="line"> err = atoi(optarg);</div> <div class="line"> period_size = err >= 32 && err < 200000 ? err : 0;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'s'</span>:</div> <div class="line"> err = atoi(optarg);</div> <div class="line"> loop_sec = err >= 1 && err <= 100000 ? err : 30;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'b'</span>:</div> <div class="line"> block = 1;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'p'</span>:</div> <div class="line"> use_poll = 1;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'e'</span>:</div> <div class="line"> effect = 1;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'n'</span>:</div> <div class="line"> resample = 0;</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> }</div> <div class="line"> }</div> <div class="line"></div> <div class="line"> <span class="keywordflow">if</span> (morehelp) {</div> <div class="line"> help();</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line"> }</div> <div class="line"> err = <a name="a36"></a><a class="code" href="group___output.html#gaca78d01bf6d081274650794861373c7d">snd_output_stdio_attach</a>(&output, stdout, 0);</div> <div class="line"> <span class="keywordflow">if</span> (err < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Output failed: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line"> }</div> <div class="line"></div> <div class="line"> loop_limit = loop_sec * rate;</div> <div class="line"> latency = latency_min - 4;</div> <div class="line"> buffer = malloc((latency_max * <a class="code" href="group___p_c_m___helpers.html#ga8d4e07f2d68cc16f607857ed8a222a29">snd_pcm_format_width</a>(format) / 8) * 2);</div> <div class="line"></div> <div class="line"> setscheduler();</div> <div class="line"></div> <div class="line"> printf(<span class="stringliteral">"Playback device is %s\n"</span>, pdevice);</div> <div class="line"> printf(<span class="stringliteral">"Capture device is %s\n"</span>, cdevice);</div> <div class="line"> printf(<span class="stringliteral">"Parameters are %iHz, %s, %i channels, %s mode\n"</span>, rate, <a class="code" href="group___p_c_m___description.html#ga2ca258b8ac569ca35f283e48d2181e45">snd_pcm_format_name</a>(format), channels, block ? <span class="stringliteral">"blocking"</span> : <span class="stringliteral">"non-blocking"</span>);</div> <div class="line"> printf(<span class="stringliteral">"Poll mode: %s\n"</span>, use_poll ? <span class="stringliteral">"yes"</span> : <span class="stringliteral">"no"</span>);</div> <div class="line"> printf(<span class="stringliteral">"Loop limit is %li frames, minimum latency = %i, maximum latency = %i\n"</span>, loop_limit, latency_min * 2, latency_max * 2);</div> <div class="line"></div> <div class="line"> <span class="keywordflow">if</span> ((err = <a name="a37"></a><a class="code" href="group___p_c_m.html#ga8340c7dc0ac37f37afe5e7c21d6c528b">snd_pcm_open</a>(&phandle, pdevice, <a name="a38"></a><a class="code" href="group___p_c_m.html#ggac23b43ff55add78638e503b9cc892c24a57a2b920dbc34173479fc9036cfc78a1">SND_PCM_STREAM_PLAYBACK</a>, block ? 0 : <a name="a39"></a><a class="code" href="group___p_c_m.html#ga6bd90de1d1527b5804090dcce51079ad">SND_PCM_NONBLOCK</a>)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Playback open error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> ((err = <a class="code" href="group___p_c_m.html#ga8340c7dc0ac37f37afe5e7c21d6c528b">snd_pcm_open</a>(&chandle, cdevice, <a name="a40"></a><a class="code" href="group___p_c_m.html#ggac23b43ff55add78638e503b9cc892c24af07834f756b4f95cb61987f4811073c4">SND_PCM_STREAM_CAPTURE</a>, block ? 0 : SND_PCM_NONBLOCK)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Record open error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line"> }</div> <div class="line"></div> <div class="line"> <span class="comment">/* initialize the filter sweep variables */</span></div> <div class="line"> <span class="keywordflow">if</span> (effect) {</div> <div class="line"> fs = (float) rate;</div> <div class="line"> BW = FILTER_BANDWIDTH;</div> <div class="line"></div> <div class="line"> lfo = 0;</div> <div class="line"> dlfo = 2.*M_PI*FILTERSWEEP_LFO_FREQ/fs;</div> <div class="line"></div> <div class="line"> x[0] = (<span class="keywordtype">float</span>*) malloc(channels*<span class="keyword">sizeof</span>(<span class="keywordtype">float</span>)); </div> <div class="line"> x[1] = (<span class="keywordtype">float</span>*) malloc(channels*<span class="keyword">sizeof</span>(<span class="keywordtype">float</span>)); </div> <div class="line"> x[2] = (<span class="keywordtype">float</span>*) malloc(channels*<span class="keyword">sizeof</span>(<span class="keywordtype">float</span>)); </div> <div class="line"> y[0] = (<span class="keywordtype">float</span>*) malloc(channels*<span class="keyword">sizeof</span>(<span class="keywordtype">float</span>)); </div> <div class="line"> y[1] = (<span class="keywordtype">float</span>*) malloc(channels*<span class="keyword">sizeof</span>(<span class="keywordtype">float</span>)); </div> <div class="line"> y[2] = (<span class="keywordtype">float</span>*) malloc(channels*<span class="keyword">sizeof</span>(<span class="keywordtype">float</span>)); </div> <div class="line"> }</div> <div class="line"> </div> <div class="line"> <span class="keywordflow">while</span> (1) {</div> <div class="line"> frames_in = frames_out = 0;</div> <div class="line"> <span class="keywordflow">if</span> (setparams(phandle, chandle, &latency) < 0)</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> showlatency(latency);</div> <div class="line"> <span class="keywordflow">if</span> ((err = <a name="a41"></a><a class="code" href="group___p_c_m.html#gac6c33091b049985baa6466e8fe93917e">snd_pcm_link</a>(chandle, phandle)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Streams link error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> (<a name="a42"></a><a class="code" href="group___p_c_m___helpers.html#ga82631361cf1c1d13af207beb59cf97ac">snd_pcm_format_set_silence</a>(format, buffer, latency*channels) < 0) {</div> <div class="line"> fprintf(stderr, <span class="stringliteral">"silence error\n"</span>);</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> (writebuf(phandle, buffer, latency, &frames_out) < 0) {</div> <div class="line"> fprintf(stderr, <span class="stringliteral">"write error\n"</span>);</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> (writebuf(phandle, buffer, latency, &frames_out) < 0) {</div> <div class="line"> fprintf(stderr, <span class="stringliteral">"write error\n"</span>);</div> <div class="line"> <span class="keywordflow">break</span>;</div> <div class="line"> }</div> <div class="line"></div> <div class="line"> <span class="keywordflow">if</span> ((err = <a name="a43"></a><a class="code" href="group___p_c_m.html#ga6bdb88b68a9d9e66015d770f600c6aea">snd_pcm_start</a>(chandle)) < 0) {</div> <div class="line"> printf(<span class="stringliteral">"Go error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(err));</div> <div class="line"> exit(0);</div> <div class="line"> }</div> <div class="line"> gettimestamp(phandle, &p_tstamp);</div> <div class="line"> gettimestamp(chandle, &c_tstamp);</div> <div class="line"><span class="preprocessor">#if 0</span></div> <div class="line"><span class="preprocessor"></span> printf(<span class="stringliteral">"Playback:\n"</span>);</div> <div class="line"> showstat(phandle, frames_out);</div> <div class="line"> printf(<span class="stringliteral">"Capture:\n"</span>);</div> <div class="line"> showstat(chandle, frames_in);</div> <div class="line"><span class="preprocessor">#endif</span></div> <div class="line"><span class="preprocessor"></span></div> <div class="line"> ok = 1;</div> <div class="line"> in_max = 0;</div> <div class="line"> <span class="keywordflow">while</span> (ok && frames_in < loop_limit) {</div> <div class="line"> <span class="keywordflow">if</span> (use_poll) {</div> <div class="line"> <span class="comment">/* use poll to wait for next event */</span></div> <div class="line"> <a name="a44"></a><a class="code" href="group___p_c_m.html#gad4d53d58b996a7cd9a5cbf1710b90375">snd_pcm_wait</a>(chandle, 1000);</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> ((r = readbuf(chandle, buffer, latency, &frames_in, &in_max)) < 0)</div> <div class="line"> ok = 0;</div> <div class="line"> <span class="keywordflow">else</span> {</div> <div class="line"> <span class="keywordflow">if</span> (effect)</div> <div class="line"> applyeffect(buffer,r);</div> <div class="line"> <span class="keywordflow">if</span> (writebuf(phandle, buffer, r, &frames_out) < 0)</div> <div class="line"> ok = 0;</div> <div class="line"> }</div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">if</span> (ok)</div> <div class="line"> printf(<span class="stringliteral">"Success\n"</span>);</div> <div class="line"> <span class="keywordflow">else</span></div> <div class="line"> printf(<span class="stringliteral">"Failure\n"</span>);</div> <div class="line"> printf(<span class="stringliteral">"Playback:\n"</span>);</div> <div class="line"> showstat(phandle, frames_out);</div> <div class="line"> printf(<span class="stringliteral">"Capture:\n"</span>);</div> <div class="line"> showstat(chandle, frames_in);</div> <div class="line"> showinmax(in_max);</div> <div class="line"> <span class="keywordflow">if</span> (p_tstamp.tv_sec == c_tstamp.tv_sec &&</div> <div class="line"> p_tstamp.tv_usec == c_tstamp.tv_usec)</div> <div class="line"> printf(<span class="stringliteral">"Hardware sync\n"</span>);</div> <div class="line"> <a name="a45"></a><a class="code" href="group___p_c_m.html#ga7000ca6010a1a2739daddff8e2fbb440">snd_pcm_drop</a>(chandle);</div> <div class="line"> <a name="a46"></a><a class="code" href="group___p_c_m.html#ga8d9ed4a62c17402de0389fd31fc7dc1f">snd_pcm_nonblock</a>(phandle, 0);</div> <div class="line"> <a name="a47"></a><a class="code" href="group___p_c_m.html#ga49afc5b8527f30c33fafa476533c9f86">snd_pcm_drain</a>(phandle);</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga8d9ed4a62c17402de0389fd31fc7dc1f">snd_pcm_nonblock</a>(phandle, !block ? 1 : 0);</div> <div class="line"> <span class="keywordflow">if</span> (ok) {</div> <div class="line"><span class="preprocessor">#if 1</span></div> <div class="line"><span class="preprocessor"></span> printf(<span class="stringliteral">"Playback time = %li.%i, Record time = %li.%i, diff = %li\n"</span>,</div> <div class="line"> p_tstamp.tv_sec,</div> <div class="line"> (<span class="keywordtype">int</span>)p_tstamp.tv_usec,</div> <div class="line"> c_tstamp.tv_sec,</div> <div class="line"> (<span class="keywordtype">int</span>)c_tstamp.tv_usec,</div> <div class="line"> timediff(p_tstamp, c_tstamp));</div> <div class="line"><span class="preprocessor">#endif</span></div> <div class="line"><span class="preprocessor"></span> <span class="keywordflow">break</span>;</div> <div class="line"> }</div> <div class="line"> <a name="a48"></a><a class="code" href="group___p_c_m.html#ga0d3af5e30593dae857b4308aab5035cd">snd_pcm_unlink</a>(chandle);</div> <div class="line"> <a name="a49"></a><a class="code" href="group___p_c_m.html#ga242ad0a269c272830d30666220edbc2a">snd_pcm_hw_free</a>(phandle);</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga242ad0a269c272830d30666220edbc2a">snd_pcm_hw_free</a>(chandle);</div> <div class="line"> }</div> <div class="line"> <a name="a50"></a><a class="code" href="group___p_c_m.html#ga042aba7262a4cbb4d444b6fc08cb7124">snd_pcm_close</a>(phandle);</div> <div class="line"> <a class="code" href="group___p_c_m.html#ga042aba7262a4cbb4d444b6fc08cb7124">snd_pcm_close</a>(chandle);</div> <div class="line"> <span class="keywordflow">return</span> 0;</div> <div class="line">}</div> </div><!-- fragment --> </div><!-- contents --> <!-- start footer part --> <hr class="footer"/><address class="footer"><small> Generated by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/> </a> 1.8.5 </small></address> </body> </html>
