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<title>ALSA project - the C library reference: /test/timer.c</title>
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<h1>/test/timer.c</h1><p><a class="anchor" id="example_test_timer"></a></p>
<div class="fragment"><pre class="fragment"><span class="preprocessor">#include <stdio.h></span>
<span class="preprocessor">#include <stdlib.h></span>
<span class="preprocessor">#include <string.h></span>
<span class="preprocessor">#include <sys/time.h></span>
<span class="preprocessor">#include "../include/asoundlib.h"</span>
<span class="keywordtype">void</span> show_status(<span class="keywordtype">void</span> *handle)
{
<span class="keywordtype">int</span> err;
<a name="a0"></a><a class="code" href="group___timer.html#ga6fe20f2c0d1535e3a200944b1244f855">snd_timer_status_t</a> *status;
<a name="a1"></a><a class="code" href="group___timer.html#ga6597b8f73b30a3f2bf2aa9f3590b92f2">snd_timer_status_alloca</a>(&status);
<span class="keywordflow">if</span> ((err = <a name="a2"></a><a class="code" href="group___timer.html#gaa78c7089909252ee0ca69f7552fa2804" title="get status from timer handle">snd_timer_status</a>(handle, status)) < 0) {
fprintf(stderr, <span class="stringliteral">"timer status %i (%s)\n"</span>, err, <a name="a3"></a><a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e" title="Returns the message for an error code.">snd_strerror</a>(err));
<span class="keywordflow">return</span>;
}
printf(<span class="stringliteral">"STATUS:\n"</span>);
printf(<span class="stringliteral">" resolution = %li\n"</span>, <a name="a4"></a><a class="code" href="group___timer.html#gaaab668cc548b6c4a24236504d63da0a0" title="get resolution in us">snd_timer_status_get_resolution</a>(status));
printf(<span class="stringliteral">" lost = %li\n"</span>, <a name="a5"></a><a class="code" href="group___timer.html#gaa7ad78e8af9855e71d4951147869693b" title="get master tick lost count">snd_timer_status_get_lost</a>(status));
printf(<span class="stringliteral">" overrun = %li\n"</span>, <a name="a6"></a><a class="code" href="group___timer.html#gaf3a83c122c2e19059297599d3486c04d" title="get overrun count">snd_timer_status_get_overrun</a>(status));
printf(<span class="stringliteral">" queue = %li\n"</span>, <a name="a7"></a><a class="code" href="group___timer.html#ga6edb10e32b6b485ecccef73d862ca648" title="get count of used queue elements">snd_timer_status_get_queue</a>(status));
}
<span class="keywordtype">void</span> read_loop(<span class="keywordtype">void</span> *handle, <span class="keywordtype">int</span> master_ticks, <span class="keywordtype">int</span> timeout)
{
<span class="keywordtype">int</span> count, err;
<span class="keyword">struct </span>pollfd *fds;
<a name="_a8"></a><a class="code" href="structsnd__timer__read__t.html">snd_timer_read_t</a> tr;
count = <a name="a9"></a><a class="code" href="group___timer.html#gaf035c37343afed7f13c60e950e461cdf" title="get count of poll descriptors for timer handle">snd_timer_poll_descriptors_count</a>(handle);
fds = calloc(count, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> pollfd));
<span class="keywordflow">if</span> (fds == NULL) {
fprintf(stderr, <span class="stringliteral">"malloc error\n"</span>);
exit(EXIT_FAILURE);
}
<span class="keywordflow">while</span> (master_ticks-- > 0) {
<span class="keywordflow">if</span> ((err = <a name="a10"></a><a class="code" href="group___timer.html#ga89ec000a41fa7dd1269e332324663f61" title="get poll descriptors">snd_timer_poll_descriptors</a>(handle, fds, count)) < 0) {
fprintf(stderr, <span class="stringliteral">"snd_timer_poll_descriptors error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e" title="Returns the message for an error code.">snd_strerror</a>(err));
exit(EXIT_FAILURE);
}
<span class="keywordflow">if</span> ((err = poll(fds, count, timeout)) < 0) {
fprintf(stderr, <span class="stringliteral">"poll error %i (%s)\n"</span>, err, strerror(err));
exit(EXIT_FAILURE);
}
<span class="keywordflow">if</span> (err == 0) {
fprintf(stderr, <span class="stringliteral">"timer time out!!\n"</span>);
exit(EXIT_FAILURE);
}
<span class="keywordflow">while</span> (<a name="a11"></a><a class="code" href="group___timer.html#ga724ada94d0bc3564ad77973c0a084682" title="read bytes using timer handle">snd_timer_read</a>(handle, &tr, <span class="keyword">sizeof</span>(tr)) == <span class="keyword">sizeof</span>(tr)) {
printf(<span class="stringliteral">"TIMER: resolution = %uns, ticks = %u\n"</span>,
tr.<a name="a12"></a><a class="code" href="structsnd__timer__read__t.html#a74c2d329a2a2c9c3bc53d5678b0fafe9">resolution</a>, tr.<a name="a13"></a><a class="code" href="structsnd__timer__read__t.html#a6f1deb447c21188ac4590e872358edd9">ticks</a>);
}
}
free(fds);
}
<span class="keyword">static</span> <span class="keywordtype">void</span> async_callback(<a name="a14"></a><a class="code" href="group___global.html#ga8cd9a1d441e9219ca5f2ff04094c7c6d" title="Internal structure for an async notification client handler.">snd_async_handler_t</a> *ahandler)
{
<a name="a15"></a><a class="code" href="group___timer.html#ga7f514d85bfd93e1e5853a5fded89b668">snd_timer_t</a> *handle = <a name="a16"></a><a class="code" href="group___timer.html#gaa497b2873abd234df7e932ecdefad5e0" title="Return timer handle related to an async handler.">snd_async_handler_get_timer</a>(ahandler);
<span class="keywordtype">int</span> *acount = <a name="a17"></a><a class="code" href="group___global.html#gad9c76588a87918901c6273e6bc98a1bc" title="Returns the private data assigned to an async handler.">snd_async_handler_get_callback_private</a>(ahandler);
<a class="code" href="structsnd__timer__read__t.html">snd_timer_read_t</a> tr;
<span class="keywordflow">while</span> (<a class="code" href="group___timer.html#ga724ada94d0bc3564ad77973c0a084682" title="read bytes using timer handle">snd_timer_read</a>(handle, &tr, <span class="keyword">sizeof</span>(tr)) == <span class="keyword">sizeof</span>(tr)) {
printf(<span class="stringliteral">"TIMER: resolution = %uns, ticks = %u\n"</span>,
tr.<a class="code" href="structsnd__timer__read__t.html#a74c2d329a2a2c9c3bc53d5678b0fafe9">resolution</a>, tr.<a class="code" href="structsnd__timer__read__t.html#a6f1deb447c21188ac4590e872358edd9">ticks</a>);
}
(*acount)++;
}
<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])
{
<span class="keywordtype">int</span> idx, err;
<span class="keywordtype">int</span> <span class="keyword">class </span>= <a name="a18"></a><a class="code" href="group___timer.html#ggafcf09894847cdee6925ab6e405c358d9ae7a63ed172c4c38199e4d6b3ed9fd728">SND_TIMER_CLASS_GLOBAL</a>;
<span class="keywordtype">int</span> sclass = <a name="a19"></a><a class="code" href="group___timer.html#ggafcf09894847cdee6925ab6e405c358d9a678ee4a7108ad3653fc49a6fe07ae45f">SND_TIMER_CLASS_NONE</a>;
<span class="keywordtype">int</span> card = 0;
<span class="keywordtype">int</span> device = <a name="a20"></a><a class="code" href="group___timer.html#ga1cda350fb4de9a2f7a137c5649e3793c">SND_TIMER_GLOBAL_SYSTEM</a>;
<span class="keywordtype">int</span> subdevice = 0;
<span class="keywordtype">int</span> list = 0;
<span class="keywordtype">int</span> async = 0;
<span class="keywordtype">int</span> acount = 0;
<a class="code" href="group___timer.html#ga7f514d85bfd93e1e5853a5fded89b668">snd_timer_t</a> *handle;
<a name="a21"></a><a class="code" href="group___timer.html#ga87c7e9656e171a76dada7e7e2da37136">snd_timer_id_t</a> *id;
<a name="a22"></a><a class="code" href="group___timer.html#ga8d2a9e26d1f38ce65160d3cd71a2bce3">snd_timer_info_t</a> *info;
<a name="a23"></a><a class="code" href="group___timer.html#ga3450759fce8e0863ebce3221e82bafca">snd_timer_params_t</a> *params;
<span class="keywordtype">char</span> timername[64];
<a class="code" href="group___global.html#ga8cd9a1d441e9219ca5f2ff04094c7c6d" title="Internal structure for an async notification client handler.">snd_async_handler_t</a> *ahandler;
<a name="a24"></a><a class="code" href="group___timer.html#gaef1895685cb2f65d1a40cc46fa5a7eb2">snd_timer_id_alloca</a>(&<span class="keywordtype">id</span>);
<a name="a25"></a><a class="code" href="group___timer.html#gafad2100b7f0478b8c3c59f0f4aced23e">snd_timer_info_alloca</a>(&info);
<a name="a26"></a><a class="code" href="group___timer.html#ga2e76b7b6f7fe340b4a06935f080fbbbd">snd_timer_params_alloca</a>(&params);
idx = 1;
<span class="keywordflow">while</span> (idx < argc) {
<span class="keywordflow">if</span> (!strncmp(argv[idx], <span class="stringliteral">"class="</span>, 5)) {
<span class="keyword">class </span>= atoi(argv[idx]+6);
} <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strncmp(argv[idx], <span class="stringliteral">"sclass="</span>, 6)) {
sclass = atoi(argv[idx]+7);
} <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strncmp(argv[idx], <span class="stringliteral">"card="</span>, 5)) {
card = atoi(argv[idx]+5);
} <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strncmp(argv[idx], <span class="stringliteral">"device="</span>, 7)) {
device = atoi(argv[idx]+7);
} <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strncmp(argv[idx], <span class="stringliteral">"subdevice="</span>, 10)) {
subdevice = atoi(argv[idx]+10);
} <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strcmp(argv[idx], <span class="stringliteral">"list"</span>)) {
list = 1;
} <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strcmp(argv[idx], <span class="stringliteral">"async"</span>)) {
async = 1;
}
idx++;
}
<span class="keywordflow">if</span> (<span class="keyword">class</span> == <a name="a27"></a><a class="code" href="group___timer.html#ggafcf09894847cdee6925ab6e405c358d9a532f7292aafb8e4eaa8fce3bb42b7ea1">SND_TIMER_CLASS_SLAVE</a> && sclass == <a name="a28"></a><a class="code" href="group___timer.html#ggad834b328331c3a4a4fb42041e2e61298a93c410a46bba52d680058f0718a32879">SND_TIMER_SCLASS_NONE</a>) {
fprintf(stderr, <span class="stringliteral">"slave class is not set\n"</span>);
exit(EXIT_FAILURE);
}
<span class="keywordflow">if</span> (list) {
<a name="a29"></a><a class="code" href="group___timer.html#ga279f189051eba2c5e072c30198deb81a">snd_timer_query_t</a> *qhandle;
<span class="keywordflow">if</span> ((err = <a name="a30"></a><a class="code" href="group___timer.html#ga54f6d3838ff4680fcda97952a60376ff" title="Opens a new connection to the timer query interface.">snd_timer_query_open</a>(&qhandle, <span class="stringliteral">"hw"</span>, 0)) < 0) {
fprintf(stderr, <span class="stringliteral">"snd_timer_query_open error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e" title="Returns the message for an error code.">snd_strerror</a>(err));
exit(EXIT_FAILURE);
}
<a name="a31"></a><a class="code" href="group___timer.html#ga93bce2afe5e3f40f9f7adc17339273c4" title="set timer class">snd_timer_id_set_class</a>(<span class="keywordtype">id</span>, <a class="code" href="group___timer.html#ggafcf09894847cdee6925ab6e405c358d9a678ee4a7108ad3653fc49a6fe07ae45f">SND_TIMER_CLASS_NONE</a>);
<span class="keywordflow">while</span> (1) {
<span class="keywordflow">if</span> ((err = <a name="a32"></a><a class="code" href="group___timer.html#ga5c10a9b8dc5f4442908fa3d15ab79169" title="obtain the next timer identification">snd_timer_query_next_device</a>(qhandle, <span class="keywordtype">id</span>)) < 0) {
fprintf(stderr, <span class="stringliteral">"timer next device error: %s\n"</span>, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e" title="Returns the message for an error code.">snd_strerror</a>(err));
<span class="keywordflow">break</span>;
}
<span class="keywordflow">if</span> (<a name="a33"></a><a class="code" href="group___timer.html#ga42ea98dbaf720519453c0110bd06fb8b" title="get timer class">snd_timer_id_get_class</a>(<span class="keywordtype">id</span>) < 0)
<span class="keywordflow">break</span>;
printf(<span class="stringliteral">"Timer device: class %i, sclass %i, card %i, device %i, subdevice %i\n"</span>,
<a class="code" href="group___timer.html#ga42ea98dbaf720519453c0110bd06fb8b" title="get timer class">snd_timer_id_get_class</a>(<span class="keywordtype">id</span>),
<a name="a34"></a><a class="code" href="group___timer.html#ga82e2754532fa2b5b28733820eab4d600" title="get timer sub-class">snd_timer_id_get_sclass</a>(<span class="keywordtype">id</span>),
<a name="a35"></a><a class="code" href="group___timer.html#ga305324f73fc12e7e42891598613a2d29" title="get timer card">snd_timer_id_get_card</a>(<span class="keywordtype">id</span>),
<a name="a36"></a><a class="code" href="group___timer.html#gaa864bb9270989329f8acc86c5aec2093" title="get timer device">snd_timer_id_get_device</a>(<span class="keywordtype">id</span>),
<a name="a37"></a><a class="code" href="group___timer.html#ga7f52f12140cd97f267143cbcd0832d02" title="get timer subdevice">snd_timer_id_get_subdevice</a>(<span class="keywordtype">id</span>));
}
<a name="a38"></a><a class="code" href="group___timer.html#ga13063464032aae91ab4e72dfdb57cb10" title="close timer query handle">snd_timer_query_close</a>(qhandle);
exit(EXIT_SUCCESS);
}
sprintf(timername, <span class="stringliteral">"hw:CLASS=%i,SCLASS=%i,CARD=%i,DEV=%i,SUBDEV=%i"</span>, <span class="keyword">class</span>, sclass, card, device, subdevice);
<span class="keywordflow">if</span> ((err = <a name="a39"></a><a class="code" href="group___timer.html#ga9fa22f49745d1e383f0d6e5d9e795e2e" title="Opens a new connection to the timer interface.">snd_timer_open</a>(&handle, timername, <a name="a40"></a><a class="code" href="group___timer.html#gac2c50bf6045560bc13aab81f25b2b740">SND_TIMER_OPEN_NONBLOCK</a>))<0) {
fprintf(stderr, <span class="stringliteral">"timer open %i (%s)\n"</span>, err, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e" title="Returns the message for an error code.">snd_strerror</a>(err));
exit(EXIT_FAILURE);
}
printf(<span class="stringliteral">"Using timer class %i, slave class %i, card %i, device %i, subdevice %i\n"</span>, <span class="keyword">class</span>, sclass, card, device, subdevice);
<span class="keywordflow">if</span> ((err = <a name="a41"></a><a class="code" href="group___timer.html#ga608cb266bf1cfd8f3796e6e55a2d5fe8" title="get information about timer handle">snd_timer_info</a>(handle, info)) < 0) {
fprintf(stderr, <span class="stringliteral">"timer info %i (%s)\n"</span>, err, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e" title="Returns the message for an error code.">snd_strerror</a>(err));
exit(0);
}
printf(<span class="stringliteral">"Timer info:\n"</span>);
printf(<span class="stringliteral">" slave = %s\n"</span>, <a name="a42"></a><a class="code" href="group___timer.html#gaccf0a207b91965e7200355a0daaac6ce" title="determine, if timer is slave">snd_timer_info_is_slave</a>(info) ? <span class="stringliteral">"yes"</span> : <span class="stringliteral">"no"</span>);
printf(<span class="stringliteral">" card = %i\n"</span>, <a name="a43"></a><a class="code" href="group___timer.html#gaddb757aa65e9532ced42ff7e9146ff34" title="get timer card">snd_timer_info_get_card</a>(info));
printf(<span class="stringliteral">" id = '%s'\n"</span>, <a name="a44"></a><a class="code" href="group___timer.html#gaf46477b4ca62a7c2bd87926a45ecbd50" title="get timer id">snd_timer_info_get_id</a>(info));
printf(<span class="stringliteral">" name = '%s'\n"</span>, <a name="a45"></a><a class="code" href="group___timer.html#ga9360acea37a3351ab9d2c17b7a264395" title="get timer name">snd_timer_info_get_name</a>(info));
printf(<span class="stringliteral">" average resolution = %li\n"</span>, <a name="a46"></a><a class="code" href="group___timer.html#ga3b33c3f0af5c93461e9493b0d4a3b81c" title="get timer resolution in us">snd_timer_info_get_resolution</a>(info));
<a name="a47"></a><a class="code" href="group___timer.html#gac39b36fdcc72cbb05adb909673df04f0" title="set timer auto start">snd_timer_params_set_auto_start</a>(params, 1);
<span class="keywordflow">if</span> (!<a class="code" href="group___timer.html#gaccf0a207b91965e7200355a0daaac6ce" title="determine, if timer is slave">snd_timer_info_is_slave</a>(info)) {
<a name="a48"></a><a class="code" href="group___timer.html#gaa7101edb9ec33fdbbb94e04256388caa" title="set timer ticks">snd_timer_params_set_ticks</a>(params, (1000000000 / <a class="code" href="group___timer.html#ga3b33c3f0af5c93461e9493b0d4a3b81c" title="get timer resolution in us">snd_timer_info_get_resolution</a>(info)) / 50); <span class="comment">/* 50Hz */</span>
<span class="keywordflow">if</span> (<a name="a49"></a><a class="code" href="group___timer.html#ga298418a42230f305c3c4efdf14da3403" title="get timer ticks">snd_timer_params_get_ticks</a>(params) < 1)
<a class="code" href="group___timer.html#gaa7101edb9ec33fdbbb94e04256388caa" title="set timer ticks">snd_timer_params_set_ticks</a>(params, 1);
printf(<span class="stringliteral">"Using %li tick(s)\n"</span>, <a class="code" href="group___timer.html#ga298418a42230f305c3c4efdf14da3403" title="get timer ticks">snd_timer_params_get_ticks</a>(params));
} <span class="keywordflow">else</span> {
<a class="code" href="group___timer.html#gaa7101edb9ec33fdbbb94e04256388caa" title="set timer ticks">snd_timer_params_set_ticks</a>(params, 1);
}
<span class="keywordflow">if</span> ((err = <a name="a50"></a><a class="code" href="group___timer.html#ga3fd358a410688c3aba3e2d69acf027a8" title="set parameters for timer handle">snd_timer_params</a>(handle, params)) < 0) {
fprintf(stderr, <span class="stringliteral">"timer params %i (%s)\n"</span>, err, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e" title="Returns the message for an error code.">snd_strerror</a>(err));
exit(0);
}
show_status(handle);
<span class="keywordflow">if</span> (async) {
err = <a name="a51"></a><a class="code" href="group___timer.html#ga076a6bbae3bfdb956b0a1a6ea9daa0a2" title="Add an async handler for a timer.">snd_async_add_timer_handler</a>(&ahandler, handle, async_callback, &acount);
<span class="keywordflow">if</span> (err < 0) {
fprintf(stderr, <span class="stringliteral">"unable to add async handler %i (%s)\n"</span>, err, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e" title="Returns the message for an error code.">snd_strerror</a>(err));
exit(EXIT_FAILURE);
}
}
<span class="keywordflow">if</span> ((err = <a name="a52"></a><a class="code" href="group___timer.html#gafc990117a12e19a729ff10ef217fe2f9" title="start the timer">snd_timer_start</a>(handle)) < 0) {
fprintf(stderr, <span class="stringliteral">"timer start %i (%s)\n"</span>, err, <a class="code" href="group___error.html#ga182bbadf2349e11602bc531e8cf22f7e" title="Returns the message for an error code.">snd_strerror</a>(err));
exit(EXIT_FAILURE);
}
<span class="keywordflow">if</span> (async) {
<span class="comment">/* because all other work is done in the signal handler,</span>
<span class="comment"> suspend the process */</span>
<span class="keywordflow">while</span> (acount < 25)
sleep(1);
<a name="a53"></a><a class="code" href="group___timer.html#ga6f8147c0679c820a77f98b1dd5b664a5" title="stop the timer">snd_timer_stop</a>(handle);
} <span class="keywordflow">else</span> {
read_loop(handle, 25, <a class="code" href="group___timer.html#gaccf0a207b91965e7200355a0daaac6ce" title="determine, if timer is slave">snd_timer_info_is_slave</a>(info) ? 10000 : 25);
}
show_status(handle);
<a name="a54"></a><a class="code" href="group___timer.html#ga155e0b5c831a3140f49c04932da9404f" title="close timer handle">snd_timer_close</a>(handle);
printf(<span class="stringliteral">"Done\n"</span>);
<span class="keywordflow">return</span> EXIT_SUCCESS;
}
</pre></div> </div>
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