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<div class="title">/test/latency.c</div> </div>
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<p><a class="anchor" id="example_test_latency"></a>Shows the measuring of minimal latency between capture and playback devices.</p>
<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 "config.h"</span></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 <time.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="preprocessor">#ifndef CLOCK_MONOTONIC_RAW</span></div>
<div class="line"><span class="preprocessor">#define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC</span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#if defined(__OpenBSD__)</span></div>
<div class="line"><span class="preprocessor">#define sched_getparam(pid, parm) (-1)</span></div>
<div class="line"><span class="preprocessor">#define sched_setscheduler(pid, policy, parm) (-1)</span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span>timespec timestamp_t;</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">char</span> *sched_policy = <span class="stringliteral">"rr"</span>;</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> <a name="a0"></a><a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a> = <a name="a1"></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> usleep_val = 0;</div>
<div class="line"><span class="keywordtype">int</span> resample = 1;</div>
<div class="line"><span class="keywordtype">int</span> sys_latency = 0; <span class="comment">/* data I/O: use system timings instead driver wakeups */</span></div>
<div class="line"><span class="keywordtype">int</span> pos_dump = 0; <span class="comment">/* dump positions */</span></div>
<div class="line"><span class="keywordtype">int</span> realtime_check = 0;</div>
<div class="line"><span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> loop_limit;</div>
<div class="line"><a class="code" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> playback_buffer_size;</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="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> frames_to_micro(<span class="keywordtype">size_t</span> frames)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">return</span> (<span class="keywordtype">long</span> <span class="keywordtype">long</span>)((frames * 1000000LL) + (rate / 2)) / rate;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> timestamp_now(timestamp_t *tstamp)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">if</span> (clock_gettime(CLOCK_MONOTONIC_RAW, tstamp))</div>
<div class="line"> printf(<span class="stringliteral">"clock_gettime() failed\n"</span>);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">long</span> <span class="keywordtype">long</span> timestamp_diff_micro(timestamp_t *tstamp)</div>
<div class="line">{</div>
<div class="line"> timestamp_t now, diff;</div>
<div class="line"> timestamp_now(&now);</div>
<div class="line"> <span class="keywordflow">if</span> (tstamp->tv_nsec > now.tv_nsec) {</div>
<div class="line"> diff.tv_sec = now.tv_sec - tstamp->tv_sec - 1;</div>
<div class="line"> diff.tv_nsec = (now.tv_nsec + 1000000000L) - tstamp->tv_nsec;</div>
<div class="line"> } <span class="keywordflow">else</span> {</div>
<div class="line"> diff.tv_sec = now.tv_sec - tstamp->tv_sec;</div>
<div class="line"> diff.tv_nsec = now.tv_nsec - tstamp->tv_nsec;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">/* microseconds */</span></div>
<div class="line"> <span class="keywordflow">return</span> (diff.tv_sec * 1000000) + ((diff.tv_nsec + 500L) / 1000L);</div>
<div class="line">}</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="a2"></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="a3"></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="a4"></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="a5"></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="a6"></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="a7"></a><a class="code" href="group___p_c_m___h_w___params.html#ga6014e0e1ec7934f8c745290e83e59199">snd_pcm_hw_params_set_format</a>(handle, params, <a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>);</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="a8"></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="a9"></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="comment">/* we do not want driver wakeups */</span></div>
<div class="line"> <span class="keywordflow">if</span> (sys_latency > 0 && <a name="a10"></a><a class="code" href="group___p_c_m___h_w___params.html#gad0f8922537619c70e41bf07eb740e54f">snd_pcm_hw_params_can_disable_period_wakeup</a>(params)) {</div>
<div class="line"> err = <a name="a11"></a><a class="code" href="group___p_c_m___h_w___params.html#gac2761ded0a51cabc953beac44f65972b">snd_pcm_hw_params_set_period_wakeup</a>(handle, params, 0);</div>
<div class="line"> <span class="keywordflow">if</span> (err < 0) {</div>
<div class="line"> printf(<span class="stringliteral">"Cannot disable period wakeups for %s\n"</span>, <span class="keywordtype">id</span>);</div>
<div class="line"> <span class="keywordflow">return</span> err;</div>
<div class="line"> }</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="a12"></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="a13"></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="a14"></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="a15"></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="a16"></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="a17"></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="a18"></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="a19"></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="a20"></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="a21"></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="a22"></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 hw 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 hw parameters for capture 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="a23"></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="a24"></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"> playback_buffer_size = p_size;</div>
<div class="line"> <span class="keywordflow">if</span> (p_psize * 2 < p_size) {</div>
<div class="line"> <a name="a25"></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="a26"></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="a27"></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> *<a name="a28"></a><a class="code" href="ump__msg_8h.html#ade20423e91627f07e610924cb0081623">status</a>;</div>
<div class="line"> </div>
<div class="line"> <a name="a29"></a><a class="code" href="group___p_c_m___status.html#ga046c09e5d14b684d9fefd70a12cdde1a">snd_pcm_status_alloca</a>(&<a class="code" href="ump__msg_8h.html#ade20423e91627f07e610924cb0081623">status</a>);</div>
<div class="line"> <span class="keywordflow">if</span> ((err = <a name="a30"></a><a class="code" href="group___p_c_m.html#ga32891eaac37741728a9b23027012c892">snd_pcm_status</a>(handle, <a class="code" href="ump__msg_8h.html#ade20423e91627f07e610924cb0081623">status</a>)) < 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="a31"></a><a class="code" href="group___p_c_m___dump.html#gaf2427b186609ad502666273342467a51">snd_pcm_status_dump</a>(<a class="code" href="ump__msg_8h.html#ade20423e91627f07e610924cb0081623">status</a>, 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> *<a class="code" href="ump__msg_8h.html#ade20423e91627f07e610924cb0081623">status</a>;</div>
<div class="line"> </div>
<div class="line"> <a class="code" href="group___p_c_m___status.html#ga046c09e5d14b684d9fefd70a12cdde1a">snd_pcm_status_alloca</a>(&<a class="code" href="ump__msg_8h.html#ade20423e91627f07e610924cb0081623">status</a>);</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, <a class="code" href="ump__msg_8h.html#ade20423e91627f07e610924cb0081623">status</a>)) < 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="a32"></a><a class="code" href="group___p_c_m___status.html#ga5eaeff98814e96c2ffd5f04c95b22c8d">snd_pcm_status_get_trigger_tstamp</a>(<a class="code" href="ump__msg_8h.html#ade20423e91627f07e610924cb0081623">status</a>, 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"> <span class="keywordtype">int</span> policy = SCHED_RR;</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *spolicy = <span class="stringliteral">"Round Robin"</span>;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> (strcasecmp(sched_policy, <span class="stringliteral">"fifo"</span>) == 0) {</div>
<div class="line"> policy = SCHED_FIFO;</div>
<div class="line"> spolicy = <span class="stringliteral">"FIFO"</span>;</div>
<div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strcasecmp(sched_policy, <span class="stringliteral">"other"</span>) == 0) {</div>
<div class="line"> policy = SCHED_OTHER;</div>
<div class="line"> spolicy = <span class="stringliteral">"OTHER"</span>;</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(policy);</div>
<div class="line"> <span class="keywordflow">if</span> (!sched_setscheduler(0, policy, &sched_param)) {</div>
<div class="line"> printf(<span class="stringliteral">"Scheduler set to %s with priority %i...\n"</span>, spolicy, 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 %s with priority %i FAILED!!!\n"</span>, spolicy, 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> len, <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="a33"></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="a34"></a><a class="code" href="group___p_c_m___helpers.html#gaa3e0ff7560342e5af2b5c7bd2d63a307">snd_pcm_format_physical_width</a>(<a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>) / 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#gaa3e0ff7560342e5af2b5c7bd2d63a307">snd_pcm_format_physical_width</a>(<a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>) / 8) * channels;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">while</span> (len > 0) {</div>
<div class="line"> r = <a name="a35"></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">#define FILTERSWEEP_LFO_DEPTH 1800.</span></div>
<div class="line"><span class="preprocessor">#define FILTERSWEEP_LFO_FREQ 0.2</span></div>
<div class="line"><span class="preprocessor">#define FILTER_BANDWIDTH 50</span></div>
<div class="line"> </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="keyword">static</span> ssize_t get_avail(<a class="code" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *pcm)</div>
<div class="line">{</div>
<div class="line"> ssize_t avail;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">while</span> (1) {</div>
<div class="line"> avail = <a name="a36"></a><a class="code" href="group___p_c_m.html#ga577b4d51e08d94930a05bbe73291ed2a">snd_pcm_avail</a>(pcm);</div>
<div class="line"> <span class="keywordflow">if</span> (avail == -EAGAIN)</div>
<div class="line"> <span class="keywordflow">continue</span>;</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> avail;</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">"-U,--updates I/O updates in milliseconds (0 = off)\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">"-y,--usleep sleep for the specified amount of microseconds between\n"</span></div>
<div class="line"><span class="stringliteral">" stream updates (default 0 - off)\n"</span></div>
<div class="line"><span class="stringliteral">"-e,--effect apply an effect (bandpass filter sweep)\n"</span></div>
<div class="line"><span class="stringliteral">"-x,--posdump dump buffer positions\n"</span></div>
<div class="line"><span class="stringliteral">"-X,--realtime do a realtime check (buffering)\n"</span></div>
<div class="line"><span class="stringliteral">"-O,--policy set scheduler policy (RR, FIFO or OTHER)\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="a37"></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">"updates"</span>, 1, NULL, <span class="charliteral">'U'</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">"usleep"</span>, 1, NULL, <span class="charliteral">'y'</span>},</div>
<div class="line"> {<span class="stringliteral">"effect"</span>, 0, NULL, <span class="charliteral">'e'</span>},</div>
<div class="line"> {<span class="stringliteral">"posdump"</span>, 0, NULL, <span class="charliteral">'x'</span>},</div>
<div class="line"> {<span class="stringliteral">"realtime"</span>, 0, NULL, <span class="charliteral">'X'</span>},</div>
<div class="line"> {<span class="stringliteral">"policy"</span>, 1, NULL, <span class="charliteral">'O'</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, cap_avail, cap_avail_max, pbk_fill, pbk_fill_min;</div>
<div class="line"> <span class="keywordtype">size_t</span> frames_in, frames_out, in_max;</div>
<div class="line"> timestamp_t tstamp_start;</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:U:F:f:c:r:B:E:s:y:O:bpenxX"</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">'U'</span>:</div>
<div class="line"> err = atoi(optarg);</div>
<div class="line"> sys_latency = err <= 0 ? 0 : 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"> <a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a> = <a name="a38"></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> (<a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a> == <a name="a39"></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"> <a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a> = <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">'y'</span>:</div>
<div class="line"> usleep_val = atoi(optarg);</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"> <span class="keywordflow">case</span> <span class="charliteral">'x'</span>:</div>
<div class="line"> pos_dump = 1;</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'X'</span>:</div>
<div class="line"> realtime_check = 1;</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'O'</span>:</div>
<div class="line"> sched_policy = optarg;</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="a40"></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 * 2 * <a class="code" href="group___p_c_m___helpers.html#gaa3e0ff7560342e5af2b5c7bd2d63a307">snd_pcm_format_physical_width</a>(<a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>) / 8) * channels);</div>
<div class="line"> </div>
<div class="line"> <span class="comment">/* I/O updates based on a system timer */</span></div>
<div class="line"> <span class="keywordflow">if</span> (sys_latency > 0) {</div>
<div class="line"> block = 0;</div>
<div class="line"> use_poll = 0;</div>
<div class="line"> }</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, use poll %s\n"</span>,</div>
<div class="line"> rate, <a class="code" href="group___p_c_m___description.html#ga2ca258b8ac569ca35f283e48d2181e45">snd_pcm_format_name</a>(<a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>),</div>
<div class="line"> channels, block ? <span class="stringliteral">"blocking"</span> : <span class="stringliteral">"non-blocking"</span>,</div>
<div class="line"> use_poll ? <span class="stringliteral">"yes"</span> : <span class="stringliteral">"no"</span>);</div>
<div class="line"> printf(<span class="stringliteral">"Loop limit is %lu frames, minimum latency = %i, maximum latency = %i"</span>,</div>
<div class="line"> loop_limit, latency_min * 2, latency_max * 2);</div>
<div class="line"> <span class="keywordflow">if</span> (sys_latency > 0)</div>
<div class="line"> printf(<span class="stringliteral">", I/O updates %ims"</span>, sys_latency);</div>
<div class="line"> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!block && !use_poll)</div>
<div class="line"> printf(<span class="stringliteral">", I/O usleep %ius"</span>, usleep_val);</div>
<div class="line"> printf(<span class="stringliteral">"\n"</span>);</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((err = <a name="a41"></a><a class="code" href="group___p_c_m.html#ga8340c7dc0ac37f37afe5e7c21d6c528b">snd_pcm_open</a>(&phandle, pdevice, <a name="a42"></a><a class="code" href="group___p_c_m.html#ggac23b43ff55add78638e503b9cc892c24a57a2b920dbc34173479fc9036cfc78a1">SND_PCM_STREAM_PLAYBACK</a>, block ? 0 : <a name="a43"></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="a44"></a><a class="code" href="group___p_c_m.html#ggac23b43ff55add78638e503b9cc892c24af07834f756b4f95cb61987f4811073c4">SND_PCM_STREAM_CAPTURE</a>, block ? 0 : <a class="code" href="group___p_c_m.html#ga6bd90de1d1527b5804090dcce51079ad">SND_PCM_NONBLOCK</a>)) < 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"> cap_avail_max = 0;</div>
<div class="line"> pbk_fill_min = latency * 2;</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="a45"></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="a46"></a><a class="code" href="group___p_c_m___helpers.html#ga82631361cf1c1d13af207beb59cf97ac">snd_pcm_format_set_silence</a>(<a class="code" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>, 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> (realtime_check)</div>
<div class="line"> timestamp_now(&tstamp_start);</div>
<div class="line"> <span class="keywordflow">if</span> ((err = <a name="a47"></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"> <span class="keywordflow">if</span> (realtime_check)</div>
<div class="line"> printf(<span class="stringliteral">"[%lldus] Stream start\n"</span>, timestamp_diff_micro(&tstamp_start));</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"> 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"> </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"> cap_avail = latency;</div>
<div class="line"> <span class="keywordflow">if</span> (sys_latency > 0) {</div>
<div class="line"> poll(NULL, 0, sys_latency);</div>
<div class="line"> cap_avail = get_avail(chandle);</div>
<div class="line"> <span class="keywordflow">if</span> (cap_avail < 0) {</div>
<div class="line"> printf(<span class="stringliteral">"Avail failed: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a>(cap_avail));</div>
<div class="line"> ok = 0;</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> }</div>
<div class="line"> } <span class="keywordflow">else</span> <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="a48"></a><a class="code" href="group___p_c_m.html#gad4d53d58b996a7cd9a5cbf1710b90375">snd_pcm_wait</a>(chandle, 1000);</div>
<div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!block && usleep_val > 0) {</div>
<div class="line"> usleep(usleep_val);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> (pos_dump || realtime_check) {</div>
<div class="line"> <span class="keywordflow">if</span> (sys_latency <= 0)</div>
<div class="line"> cap_avail = get_avail(chandle);</div>
<div class="line"> pbk_fill = get_avail(phandle);</div>
<div class="line"> <span class="keywordflow">if</span> (pbk_fill >= 0)</div>
<div class="line"> pbk_fill = playback_buffer_size - pbk_fill;</div>
<div class="line"> <span class="keywordflow">if</span> (cap_avail > cap_avail_max)</div>
<div class="line"> cap_avail_max = cap_avail;</div>
<div class="line"> <span class="keywordflow">if</span> (pbk_fill >= 0 && pbk_fill < pbk_fill_min)</div>
<div class="line"> pbk_fill_min = pbk_fill;</div>
<div class="line"> <span class="keywordflow">if</span> (realtime_check) {</div>
<div class="line"> <span class="keywordtype">long</span> <span class="keywordtype">long</span> diff = timestamp_diff_micro(&tstamp_start);</div>
<div class="line"> <span class="keywordtype">long</span> <span class="keywordtype">long</span> cap_pos = frames_to_micro(frames_in + cap_avail);</div>
<div class="line"> <span class="keywordtype">long</span> <span class="keywordtype">long</span> pbk_pos = frames_to_micro(frames_out - pbk_fill);</div>
<div class="line"> printf(<span class="stringliteral">"[%lldus] POS: p=%zd (min=%zd, rt=%lldus) c=%zd (max=%zd, rt=%lldus)\n"</span>,</div>
<div class="line"> diff, pbk_fill, pbk_fill_min, pbk_pos - diff,</div>
<div class="line"> cap_avail, cap_avail_max, cap_pos - diff);</div>
<div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (pos_dump) {</div>
<div class="line"> printf(<span class="stringliteral">"POS: p=%zd (min=%zd), c=%zd (max=%zd)\n"</span>,</div>
<div class="line"> pbk_fill, pbk_fill_min, cap_avail, cap_avail_max);</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> ((r = readbuf(chandle, buffer, cap_avail, &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"> <span class="keywordflow">if</span> (realtime_check) {</div>
<div class="line"> <span class="keywordtype">long</span> <span class="keywordtype">long</span> diff = timestamp_diff_micro(&tstamp_start);</div>
<div class="line"> <span class="keywordtype">long</span> <span class="keywordtype">long</span> mtime = frames_to_micro(frames_in);</div>
<div class="line"> printf(<span class="stringliteral">"Elapsed real time: %lldus\n"</span>, diff);</div>
<div class="line"> printf(<span class="stringliteral">"Elapsed device time: %lldus\n"</span>, mtime);</div>
<div class="line"> printf(<span class="stringliteral">"Test time diff (device - real): %lldus\n"</span>, mtime - diff);</div>
<div class="line"> }</div>
<div class="line"> <a name="a49"></a><a class="code" href="group___p_c_m.html#ga7000ca6010a1a2739daddff8e2fbb440">snd_pcm_drop</a>(chandle);</div>
<div class="line"> <a name="a50"></a><a class="code" href="group___p_c_m.html#ga8d9ed4a62c17402de0389fd31fc7dc1f">snd_pcm_nonblock</a>(phandle, 0);</div>
<div class="line"> <a name="a51"></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"> printf(<span class="stringliteral">"Playback time = %li.%i, Record time = %li.%i, diff = %li\n"</span>,</div>
<div class="line"> (<span class="keywordtype">long</span>)p_tstamp.tv_sec,</div>
<div class="line"> (<span class="keywordtype">int</span>)p_tstamp.tv_usec,</div>
<div class="line"> (<span class="keywordtype">long</span>)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="keywordflow">break</span>;</div>
<div class="line"> }</div>
<div class="line"> <a name="a52"></a><a class="code" href="group___p_c_m.html#ga0d3af5e30593dae857b4308aab5035cd">snd_pcm_unlink</a>(chandle);</div>
<div class="line"> <a name="a53"></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="a54"></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"> <a name="a55"></a><a class="code" href="group___output.html#gab4be4e572d2a0d0f2f46faf8d45aa35d">snd_output_close</a>(output);</div>
<div class="line"> <a name="a56"></a><a class="code" href="group___configuration.html#ga51dbc0ff1d9b34d753706d09d768116b">snd_config_update_free_global</a>();</div>
<div class="line"> free(buffer);</div>
<div class="line"> free(pdevice);</div>
<div class="line"> free(cdevice);</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="ttc" id="agroup___configuration_html_ga51dbc0ff1d9b34d753706d09d768116b"><div class="ttname"><a href="group___configuration.html#ga51dbc0ff1d9b34d753706d09d768116b">snd_config_update_free_global</a></div><div class="ttdeci">int snd_config_update_free_global(void)</div><div class="ttdoc">Frees the global configuration tree in snd_config.</div><div class="ttdef"><b>Definition:</b> conf.c:4781</div></div>
<div class="ttc" id="agroup___error_html_ga182bbadf2349e11602bc531e8cf22f7e"><div class="ttname"><a href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e">snd_strerror</a></div><div class="ttdeci">const char * snd_strerror(int errnum)</div><div class="ttdoc">Returns the message for an error code.</div><div class="ttdef"><b>Definition:</b> error.c:51</div></div>
<div class="ttc" id="agroup___global_html_gadd377862d568809fb0e32c9faddf99a4"><div class="ttname"><a href="group___global.html#gadd377862d568809fb0e32c9faddf99a4">snd_timestamp_t</a></div><div class="ttdeci">struct timeval snd_timestamp_t</div><div class="ttdef"><b>Definition:</b> global.h:152</div></div>
<div class="ttc" id="agroup___output_html_ga49729cc6454539495c1f5b6e95cd474a"><div class="ttname"><a href="group___output.html#ga49729cc6454539495c1f5b6e95cd474a">snd_output_t</a></div><div class="ttdeci">struct _snd_output snd_output_t</div><div class="ttdoc">Internal structure for an output object.</div><div class="ttdef"><b>Definition:</b> output.h:56</div></div>
<div class="ttc" id="agroup___output_html_gab4be4e572d2a0d0f2f46faf8d45aa35d"><div class="ttname"><a href="group___output.html#gab4be4e572d2a0d0f2f46faf8d45aa35d">snd_output_close</a></div><div class="ttdeci">int snd_output_close(snd_output_t *output)</div><div class="ttdoc">Closes an output handle.</div><div class="ttdef"><b>Definition:</b> output.c:57</div></div>
<div class="ttc" id="agroup___output_html_gaca78d01bf6d081274650794861373c7d"><div class="ttname"><a href="group___output.html#gaca78d01bf6d081274650794861373c7d">snd_output_stdio_attach</a></div><div class="ttdeci">int snd_output_stdio_attach(snd_output_t **outputp, FILE *fp, int _close)</div><div class="ttdoc">Creates a new output object using an existing stdio FILE pointer.</div><div class="ttdef"><b>Definition:</b> output.c:188</div></div>
<div class="ttc" id="agroup___p_c_m___description_html_ga2ca258b8ac569ca35f283e48d2181e45"><div class="ttname"><a href="group___p_c_m___description.html#ga2ca258b8ac569ca35f283e48d2181e45">snd_pcm_format_name</a></div><div class="ttdeci">const char * snd_pcm_format_name(const snd_pcm_format_t format)</div><div class="ttdoc">get name of PCM sample format</div><div class="ttdef"><b>Definition:</b> pcm.c:2153</div></div>
<div class="ttc" id="agroup___p_c_m___description_html_ga59f99dd9647315a7312d1f2b6204b7bc"><div class="ttname"><a href="group___p_c_m___description.html#ga59f99dd9647315a7312d1f2b6204b7bc">snd_pcm_format_value</a></div><div class="ttdeci">snd_pcm_format_t snd_pcm_format_value(const char *name)</div><div class="ttdoc">get PCM sample format from name</div><div class="ttdef"><b>Definition:</b> pcm.c:2177</div></div>
<div class="ttc" id="agroup___p_c_m___dump_html_ga9c5c879409c504e155e234905d031d8d"><div class="ttname"><a href="group___p_c_m___dump.html#ga9c5c879409c504e155e234905d031d8d">snd_pcm_dump</a></div><div class="ttdeci">int snd_pcm_dump(snd_pcm_t *pcm, snd_output_t *out)</div><div class="ttdoc">Dump PCM info.</div><div class="ttdef"><b>Definition:</b> pcm.c:2429</div></div>
<div class="ttc" id="agroup___p_c_m___dump_html_gaf2427b186609ad502666273342467a51"><div class="ttname"><a href="group___p_c_m___dump.html#gaf2427b186609ad502666273342467a51">snd_pcm_status_dump</a></div><div class="ttdeci">int snd_pcm_status_dump(snd_pcm_status_t *status, snd_output_t *out)</div><div class="ttdoc">Dump status.</div><div class="ttdef"><b>Definition:</b> pcm.c:2408</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga06b83cb9a788f99b7b09b570b4355cee"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga06b83cb9a788f99b7b09b570b4355cee">snd_pcm_hw_params_alloca</a></div><div class="ttdeci">#define snd_pcm_hw_params_alloca(ptr)</div><div class="ttdoc">allocate an invalid snd_pcm_hw_params_t using standard alloca</div><div class="ttdef"><b>Definition:</b> pcm.h:786</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga17f3826360b0fe1f47c696388d25ac93"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga17f3826360b0fe1f47c696388d25ac93">snd_pcm_hw_params_get_periods_min</a></div><div class="ttdeci">int snd_pcm_hw_params_get_periods_min(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)</div><div class="ttdoc">Extract minimum periods count from a configuration space.</div><div class="ttdef"><b>Definition:</b> pcm.c:5580</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga2c00cb635d374030595dbc27b7a983a7"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga2c00cb635d374030595dbc27b7a983a7">snd_pcm_hw_params_set_buffer_size_near</a></div><div class="ttdeci">int snd_pcm_hw_params_set_buffer_size_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)</div><div class="ttdoc">Restrict a configuration space to have buffer size nearest to a target.</div><div class="ttdef"><b>Definition:</b> pcm.c:6086</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga39124280d06ce63092a77e3f25ddd6ee"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga39124280d06ce63092a77e3f25ddd6ee">snd_pcm_hw_params_set_rate_near</a></div><div class="ttdeci">int snd_pcm_hw_params_set_rate_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)</div><div class="ttdoc">Restrict a configuration space to have rate nearest to a target.</div><div class="ttdef"><b>Definition:</b> pcm.c:4929</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga3a5b2a05c5d9869cc743dac71c0d270a"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga3a5b2a05c5d9869cc743dac71c0d270a">snd_pcm_hw_params_set_channels</a></div><div class="ttdeci">int snd_pcm_hw_params_set_channels(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val)</div><div class="ttdoc">Restrict a configuration space to contain only one channels count.</div><div class="ttdef"><b>Definition:</b> pcm.c:4694</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga4c8f1c632931923531ca68ee048a8de8"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga4c8f1c632931923531ca68ee048a8de8">snd_pcm_hw_params_set_access</a></div><div class="ttdeci">int snd_pcm_hw_params_set_access(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access)</div><div class="ttdoc">Restrict a configuration space to contain only one access type.</div><div class="ttdef"><b>Definition:</b> pcm.c:4379</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga6014e0e1ec7934f8c745290e83e59199"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga6014e0e1ec7934f8c745290e83e59199">snd_pcm_hw_params_set_format</a></div><div class="ttdeci">int snd_pcm_hw_params_set_format(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val)</div><div class="ttdoc">Restrict a configuration space to contain only one format.</div><div class="ttdef"><b>Definition:</b> pcm.c:4476</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga6e2dd8efbb7a4084bd05e6cc458d84f7"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga6e2dd8efbb7a4084bd05e6cc458d84f7">snd_pcm_hw_params_any</a></div><div class="ttdeci">int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)</div><div class="ttdoc">Fill params with a full configuration space for a PCM.</div><div class="ttdef"><b>Definition:</b> pcm.c:3983</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga71f5d43bf63dc7292b8b58f17acccf89"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga71f5d43bf63dc7292b8b58f17acccf89">snd_pcm_hw_params_get_period_time</a></div><div class="ttdeci">int snd_pcm_hw_params_get_period_time(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)</div><div class="ttdoc">Extract period time from a configuration space.</div><div class="ttdef"><b>Definition:</b> pcm.c:5137</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga82eecc0e27a94ce0caa195cc3765536c"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga82eecc0e27a94ce0caa195cc3765536c">snd_pcm_hw_params_set_rate_resample</a></div><div class="ttdeci">int snd_pcm_hw_params_set_rate_resample(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val)</div><div class="ttdoc">Restrict a configuration space to contain only real hardware rates.</div><div class="ttdef"><b>Definition:</b> pcm.c:4980</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga9162045265f283c532634506456cab09"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga9162045265f283c532634506456cab09">snd_pcm_hw_params_set_period_size_near</a></div><div class="ttdeci">int snd_pcm_hw_params_set_period_size_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir)</div><div class="ttdoc">Restrict a configuration space to have period size nearest to a target.</div><div class="ttdef"><b>Definition:</b> pcm.c:5482</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_ga9bcedf4bb4b21527a584846a5986a1f4"><div class="ttname"><a href="group___p_c_m___h_w___params.html#ga9bcedf4bb4b21527a584846a5986a1f4">snd_pcm_hw_params_copy</a></div><div class="ttdeci">void snd_pcm_hw_params_copy(snd_pcm_hw_params_t *dst, const snd_pcm_hw_params_t *src)</div><div class="ttdoc">copy one snd_pcm_hw_params_t to another</div><div class="ttdef"><b>Definition:</b> pcm.c:4334</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_gab6556fcaaf926360d2064044a6f6cfb4"><div class="ttname"><a href="group___p_c_m___h_w___params.html#gab6556fcaaf926360d2064044a6f6cfb4">snd_pcm_hw_params_get_buffer_size</a></div><div class="ttdeci">int snd_pcm_hw_params_get_buffer_size(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)</div><div class="ttdoc">Extract buffer size from a configuration space.</div><div class="ttdef"><b>Definition:</b> pcm.c:5948</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_gaba48ea189171536f9793e0d99e6db5e0"><div class="ttname"><a href="group___p_c_m___h_w___params.html#gaba48ea189171536f9793e0d99e6db5e0">snd_pcm_hw_params_get_period_size</a></div><div class="ttdeci">int snd_pcm_hw_params_get_period_size(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir)</div><div class="ttdoc">Extract period size from a configuration space.</div><div class="ttdef"><b>Definition:</b> pcm.c:5325</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_gac2761ded0a51cabc953beac44f65972b"><div class="ttname"><a href="group___p_c_m___h_w___params.html#gac2761ded0a51cabc953beac44f65972b">snd_pcm_hw_params_set_period_wakeup</a></div><div class="ttdeci">int snd_pcm_hw_params_set_period_wakeup(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val)</div><div class="ttdoc">Restrict a configuration space to settings without period wakeups.</div><div class="ttdef"><b>Definition:</b> pcm.c:5059</div></div>
<div class="ttc" id="agroup___p_c_m___h_w___params_html_gad0f8922537619c70e41bf07eb740e54f"><div class="ttname"><a href="group___p_c_m___h_w___params.html#gad0f8922537619c70e41bf07eb740e54f">snd_pcm_hw_params_can_disable_period_wakeup</a></div><div class="ttdeci">int snd_pcm_hw_params_can_disable_period_wakeup(const snd_pcm_hw_params_t *params)</div><div class="ttdoc">Check if hardware can disable period wakeups.</div><div class="ttdef"><b>Definition:</b> pcm.c:3794</div></div>
<div class="ttc" id="agroup___p_c_m___helpers_html_ga82631361cf1c1d13af207beb59cf97ac"><div class="ttname"><a href="group___p_c_m___helpers.html#ga82631361cf1c1d13af207beb59cf97ac">snd_pcm_format_set_silence</a></div><div class="ttdeci">int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int samples)</div><div class="ttdoc">Silence a PCM samples buffer.</div><div class="ttdef"><b>Definition:</b> pcm_misc.c:607</div></div>
<div class="ttc" id="agroup___p_c_m___helpers_html_gaa3e0ff7560342e5af2b5c7bd2d63a307"><div class="ttname"><a href="group___p_c_m___helpers.html#gaa3e0ff7560342e5af2b5c7bd2d63a307">snd_pcm_format_physical_width</a></div><div class="ttdeci">int snd_pcm_format_physical_width(snd_pcm_format_t format)</div><div class="ttdoc">Return the physical bit-width of the format (bits needed to store a PCM sample)</div><div class="ttdef"><b>Definition:</b> pcm_misc.c:277</div></div>
<div class="ttc" id="agroup___p_c_m___s_w___params_html_ga1d338f1f7e33b7a6d0f9a8f61f87f057"><div class="ttname"><a href="group___p_c_m___s_w___params.html#ga1d338f1f7e33b7a6d0f9a8f61f87f057">snd_pcm_sw_params_set_start_threshold</a></div><div class="ttdeci">int snd_pcm_sw_params_set_start_threshold(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)</div><div class="ttdoc">Set start threshold inside a software configuration container.</div><div class="ttdef"><b>Definition:</b> pcm.c:6792</div></div>
<div class="ttc" id="agroup___p_c_m___s_w___params_html_ga79b12cbbd309750156261e7f5a39167b"><div class="ttname"><a href="group___p_c_m___s_w___params.html#ga79b12cbbd309750156261e7f5a39167b">snd_pcm_sw_params_set_avail_min</a></div><div class="ttdeci">int snd_pcm_sw_params_set_avail_min(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)</div><div class="ttdoc">Set avail min inside a software configuration container.</div><div class="ttdef"><b>Definition:</b> pcm.c:6684</div></div>
<div class="ttc" id="agroup___p_c_m___s_w___params_html_ga8e564553bdc89948c918729e3cc7beb0"><div class="ttname"><a href="group___p_c_m___s_w___params.html#ga8e564553bdc89948c918729e3cc7beb0">snd_pcm_sw_params_alloca</a></div><div class="ttdeci">#define snd_pcm_sw_params_alloca(ptr)</div><div class="ttdoc">allocate an invalid snd_pcm_sw_params_t using standard alloca</div><div class="ttdef"><b>Definition:</b> pcm.h:929</div></div>
<div class="ttc" id="agroup___p_c_m___status_html_ga046c09e5d14b684d9fefd70a12cdde1a"><div class="ttname"><a href="group___p_c_m___status.html#ga046c09e5d14b684d9fefd70a12cdde1a">snd_pcm_status_alloca</a></div><div class="ttdeci">#define snd_pcm_status_alloca(ptr)</div><div class="ttdoc">allocate an invalid snd_pcm_status_t using standard alloca</div><div class="ttdef"><b>Definition:</b> pcm.h:1052</div></div>
<div class="ttc" id="agroup___p_c_m___status_html_ga5eaeff98814e96c2ffd5f04c95b22c8d"><div class="ttname"><a href="group___p_c_m___status.html#ga5eaeff98814e96c2ffd5f04c95b22c8d">snd_pcm_status_get_trigger_tstamp</a></div><div class="ttdeci">void snd_pcm_status_get_trigger_tstamp(const snd_pcm_status_t *obj, snd_timestamp_t *ptr)</div><div class="ttdoc">Get trigger timestamp from a PCM status container.</div><div class="ttdef"><b>Definition:</b> pcm.c:7037</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga042aba7262a4cbb4d444b6fc08cb7124"><div class="ttname"><a href="group___p_c_m.html#ga042aba7262a4cbb4d444b6fc08cb7124">snd_pcm_close</a></div><div class="ttdeci">int snd_pcm_close(snd_pcm_t *pcm)</div><div class="ttdoc">close PCM handle</div><div class="ttdef"><b>Definition:</b> pcm.c:776</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga0d3af5e30593dae857b4308aab5035cd"><div class="ttname"><a href="group___p_c_m.html#ga0d3af5e30593dae857b4308aab5035cd">snd_pcm_unlink</a></div><div class="ttdeci">int snd_pcm_unlink(snd_pcm_t *pcm)</div><div class="ttdoc">Remove a PCM from a linked group.</div><div class="ttdef"><b>Definition:</b> pcm.c:1732</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga1ca0dc120a484965e26cabf966502330"><div class="ttname"><a href="group___p_c_m.html#ga1ca0dc120a484965e26cabf966502330">snd_pcm_hw_params</a></div><div class="ttdeci">int snd_pcm_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)</div><div class="ttdoc">Install one PCM hardware configuration chosen from a configuration space and snd_pcm_prepare it.</div><div class="ttdef"><b>Definition:</b> pcm.c:951</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga242ad0a269c272830d30666220edbc2a"><div class="ttname"><a href="group___p_c_m.html#ga242ad0a269c272830d30666220edbc2a">snd_pcm_hw_free</a></div><div class="ttdeci">int snd_pcm_hw_free(snd_pcm_t *pcm)</div><div class="ttdoc">Remove PCM hardware configuration and free associated resources.</div><div class="ttdef"><b>Definition:</b> pcm.c:968</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga32891eaac37741728a9b23027012c892"><div class="ttname"><a href="group___p_c_m.html#ga32891eaac37741728a9b23027012c892">snd_pcm_status</a></div><div class="ttdeci">int snd_pcm_status(snd_pcm_t *pcm, snd_pcm_status_t *status)</div><div class="ttdoc">Obtain status (runtime) information for PCM handle.</div><div class="ttdef"><b>Definition:</b> pcm.c:1054</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga49afc5b8527f30c33fafa476533c9f86"><div class="ttname"><a href="group___p_c_m.html#ga49afc5b8527f30c33fafa476533c9f86">snd_pcm_drain</a></div><div class="ttdeci">int snd_pcm_drain(snd_pcm_t *pcm)</div><div class="ttdoc">Stop a PCM preserving pending frames.</div><div class="ttdef"><b>Definition:</b> pcm.c:1358</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga4c2c7bd26cf221268d59dc3bbeb9c048"><div class="ttname"><a href="group___p_c_m.html#ga4c2c7bd26cf221268d59dc3bbeb9c048">snd_pcm_readi</a></div><div class="ttdeci">snd_pcm_sframes_t snd_pcm_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size)</div><div class="ttdoc">Read interleaved frames from a PCM.</div><div class="ttdef"><b>Definition:</b> pcm.c:1647</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga577b4d51e08d94930a05bbe73291ed2a"><div class="ttname"><a href="group___p_c_m.html#ga577b4d51e08d94930a05bbe73291ed2a">snd_pcm_avail</a></div><div class="ttdeci">snd_pcm_sframes_t snd_pcm_avail(snd_pcm_t *pcm)</div><div class="ttdoc">Return number of frames ready to be read (capture) / written (playback)</div><div class="ttdef"><b>Definition:</b> pcm.c:3074</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga61c5495ffb44c75aaa595e85512d28de"><div class="ttname"><a href="group___p_c_m.html#ga61c5495ffb44c75aaa595e85512d28de">snd_pcm_sw_params_current</a></div><div class="ttdeci">int snd_pcm_sw_params_current(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)</div><div class="ttdoc">Return current software configuration for a PCM.</div><div class="ttdef"><b>Definition:</b> pcm.c:6384</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga65c737127994f0a980edad744e36dc40"><div class="ttname"><a href="group___p_c_m.html#ga65c737127994f0a980edad744e36dc40">snd_pcm_hw_params_t</a></div><div class="ttdeci">struct _snd_pcm_hw_params snd_pcm_hw_params_t</div><div class="ttdef"><b>Definition:</b> pcm.h:64</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga6bd90de1d1527b5804090dcce51079ad"><div class="ttname"><a href="group___p_c_m.html#ga6bd90de1d1527b5804090dcce51079ad">SND_PCM_NONBLOCK</a></div><div class="ttdeci">#define SND_PCM_NONBLOCK</div><div class="ttdef"><b>Definition:</b> pcm.h:401</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga6bdb88b68a9d9e66015d770f600c6aea"><div class="ttname"><a href="group___p_c_m.html#ga6bdb88b68a9d9e66015d770f600c6aea">snd_pcm_start</a></div><div class="ttdeci">int snd_pcm_start(snd_pcm_t *pcm)</div><div class="ttdoc">Start a PCM.</div><div class="ttdef"><b>Definition:</b> pcm.c:1290</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga7000ca6010a1a2739daddff8e2fbb440"><div class="ttname"><a href="group___p_c_m.html#ga7000ca6010a1a2739daddff8e2fbb440">snd_pcm_drop</a></div><div class="ttdeci">int snd_pcm_drop(snd_pcm_t *pcm)</div><div class="ttdoc">Stop a PCM dropping pending frames.</div><div class="ttdef"><b>Definition:</b> pcm.c:1321</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga788d05de75f2d536f8443cb0306754d0"><div class="ttname"><a href="group___p_c_m.html#ga788d05de75f2d536f8443cb0306754d0">snd_pcm_prepare</a></div><div class="ttdeci">int snd_pcm_prepare(snd_pcm_t *pcm)</div><div class="ttdoc">Prepare PCM for use.</div><div class="ttdef"><b>Definition:</b> pcm.c:1235</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga7e082d9ea701709270b0674a0be23b09"><div class="ttname"><a href="group___p_c_m.html#ga7e082d9ea701709270b0674a0be23b09">snd_pcm_sw_params_t</a></div><div class="ttdeci">struct _snd_pcm_sw_params snd_pcm_sw_params_t</div><div class="ttdef"><b>Definition:</b> pcm.h:67</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga8340c7dc0ac37f37afe5e7c21d6c528b"><div class="ttname"><a href="group___p_c_m.html#ga8340c7dc0ac37f37afe5e7c21d6c528b">snd_pcm_open</a></div><div class="ttdeci">int snd_pcm_open(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode)</div><div class="ttdoc">Opens a PCM.</div><div class="ttdef"><b>Definition:</b> pcm.c:2744</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga891ccaeea2c685a533b61b5fa0493974"><div class="ttname"><a href="group___p_c_m.html#ga891ccaeea2c685a533b61b5fa0493974">snd_pcm_sw_params</a></div><div class="ttdeci">int snd_pcm_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)</div><div class="ttdoc">Install PCM software configuration defined by params.</div><div class="ttdef"><b>Definition:</b> pcm.c:1001</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga8d9ed4a62c17402de0389fd31fc7dc1f"><div class="ttname"><a href="group___p_c_m.html#ga8d9ed4a62c17402de0389fd31fc7dc1f">snd_pcm_nonblock</a></div><div class="ttdeci">int snd_pcm_nonblock(snd_pcm_t *pcm, int nonblock)</div><div class="ttdoc">set nonblock mode</div><div class="ttdef"><b>Definition:</b> pcm.c:812</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga902b87281c46910b469d5f7aaafc1890"><div class="ttname"><a href="group___p_c_m.html#ga902b87281c46910b469d5f7aaafc1890">snd_pcm_status_t</a></div><div class="ttdeci">struct _snd_pcm_status snd_pcm_status_t</div><div class="ttdef"><b>Definition:</b> pcm.h:69</div></div>
<div class="ttc" id="agroup___p_c_m_html_ga919e634deecd855b6e2e15174e70d3ea"><div class="ttname"><a href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a></div><div class="ttdeci">struct _snd_pcm snd_pcm_t</div><div class="ttdef"><b>Definition:</b> pcm.h:418</div></div>
<div class="ttc" id="agroup___p_c_m_html_gaa14b7f26877a812acbb39811364177f8"><div class="ttname"><a href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a></div><div class="ttdeci">snd_pcm_format_t</div><div class="ttdef"><b>Definition:</b> pcm.h:125</div></div>
<div class="ttc" id="agroup___p_c_m_html_gab01fcfe9b97382a8d3f2027c664b8b8a"><div class="ttname"><a href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a></div><div class="ttdeci">unsigned long snd_pcm_uframes_t</div><div class="ttdef"><b>Definition:</b> pcm.h:396</div></div>
<div class="ttc" id="agroup___p_c_m_html_gabc748a500743713eafa960c7d104ca6f"><div class="ttname"><a href="group___p_c_m.html#gabc748a500743713eafa960c7d104ca6f">snd_pcm_writei</a></div><div class="ttdeci">snd_pcm_sframes_t snd_pcm_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size)</div><div class="ttdoc">Write interleaved frames to a PCM.</div><div class="ttdef"><b>Definition:</b> pcm.c:1569</div></div>
<div class="ttc" id="agroup___p_c_m_html_gac6c33091b049985baa6466e8fe93917e"><div class="ttname"><a href="group___p_c_m.html#gac6c33091b049985baa6466e8fe93917e">snd_pcm_link</a></div><div class="ttdeci">int snd_pcm_link(snd_pcm_t *pcm1, snd_pcm_t *pcm2)</div><div class="ttdoc">Link two PCMs.</div><div class="ttdef"><b>Definition:</b> pcm.c:1714</div></div>
<div class="ttc" id="agroup___p_c_m_html_gad4d53d58b996a7cd9a5cbf1710b90375"><div class="ttname"><a href="group___p_c_m.html#gad4d53d58b996a7cd9a5cbf1710b90375">snd_pcm_wait</a></div><div class="ttdeci">int snd_pcm_wait(snd_pcm_t *pcm, int timeout)</div><div class="ttdoc">Wait for a PCM to become ready.</div><div class="ttdef"><b>Definition:</b> pcm.c:2903</div></div>
<div class="ttc" id="agroup___p_c_m_html_gga661221ba5e8f1d6eaf4ab8e2da57cc1aa72a970ed6e676ab0fd9f3c3d36737e0a"><div class="ttname"><a href="group___p_c_m.html#gga661221ba5e8f1d6eaf4ab8e2da57cc1aa72a970ed6e676ab0fd9f3c3d36737e0a">SND_PCM_ACCESS_RW_INTERLEAVED</a></div><div class="ttdeci">@ SND_PCM_ACCESS_RW_INTERLEAVED</div><div class="ttdef"><b>Definition:</b> pcm.h:118</div></div>
<div class="ttc" id="agroup___p_c_m_html_ggaa14b7f26877a812acbb39811364177f8a8b66a29293c62df9d1678c609fab76c0"><div class="ttname"><a href="group___p_c_m.html#ggaa14b7f26877a812acbb39811364177f8a8b66a29293c62df9d1678c609fab76c0">SND_PCM_FORMAT_S16_LE</a></div><div class="ttdeci">@ SND_PCM_FORMAT_S16_LE</div><div class="ttdef"><b>Definition:</b> pcm.h:133</div></div>
<div class="ttc" id="agroup___p_c_m_html_ggaa14b7f26877a812acbb39811364177f8ab1e118ecdccf628639b5c85bc3a48999"><div class="ttname"><a href="group___p_c_m.html#ggaa14b7f26877a812acbb39811364177f8ab1e118ecdccf628639b5c85bc3a48999">SND_PCM_FORMAT_UNKNOWN</a></div><div class="ttdeci">@ SND_PCM_FORMAT_UNKNOWN</div><div class="ttdef"><b>Definition:</b> pcm.h:127</div></div>
<div class="ttc" id="agroup___p_c_m_html_ggac23b43ff55add78638e503b9cc892c24a57a2b920dbc34173479fc9036cfc78a1"><div class="ttname"><a href="group___p_c_m.html#ggac23b43ff55add78638e503b9cc892c24a57a2b920dbc34173479fc9036cfc78a1">SND_PCM_STREAM_PLAYBACK</a></div><div class="ttdeci">@ SND_PCM_STREAM_PLAYBACK</div><div class="ttdef"><b>Definition:</b> pcm.h:103</div></div>
<div class="ttc" id="agroup___p_c_m_html_ggac23b43ff55add78638e503b9cc892c24af07834f756b4f95cb61987f4811073c4"><div class="ttname"><a href="group___p_c_m.html#ggac23b43ff55add78638e503b9cc892c24af07834f756b4f95cb61987f4811073c4">SND_PCM_STREAM_CAPTURE</a></div><div class="ttdeci">@ SND_PCM_STREAM_CAPTURE</div><div class="ttdef"><b>Definition:</b> pcm.h:105</div></div>
<div class="ttc" id="aump__msg_8h_html_a7864fd50d470f893524181b4a59d9828"><div class="ttname"><a href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a></div><div class="ttdeci">uint16_t format</div><div class="ttdef"><b>Definition:</b> ump_msg.h:11</div></div>
<div class="ttc" id="aump__msg_8h_html_ade20423e91627f07e610924cb0081623"><div class="ttname"><a href="ump__msg_8h.html#ade20423e91627f07e610924cb0081623">status</a></div><div class="ttdeci">uint8_t status</div><div class="ttdef"><b>Definition:</b> ump_msg.h:11</div></div>
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