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<title>ALSA project - the C library reference: Access Mask Functions</title>
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<h1>Access Mask Functions<br/>
<small>
[<a class="el" href="group___p_c_m.html">PCM Interface</a>]</small>
</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#ga8097b3ae42fa4a2e5bece2ca95b515b7">snd_pcm_access_mask_alloca</a>(ptr)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">allocate an empty <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> using standard alloca <a href="#ga8097b3ae42fa4a2e5bece2ca95b515b7"></a><br/></td></tr>
<tr><td colspan="2"><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#ga963ead3f1169f4b5e03a2968adc9cb0a">snd_pcm_access_mask_sizeof</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">get size of <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> <a href="#ga963ead3f1169f4b5e03a2968adc9cb0a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#gafedd1f9c96aa8a93ab7f2c0135de3780">snd_pcm_access_mask_malloc</a> (<a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> **ptr)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">allocate an empty <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> using standard malloc <a href="#gafedd1f9c96aa8a93ab7f2c0135de3780"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#ga965129493161fae3ab534209b7e6b2bc">snd_pcm_access_mask_free</a> (<a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> *obj)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">frees a previously allocated <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> <a href="#ga965129493161fae3ab534209b7e6b2bc"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#ga4fc7338c7c0cd715ea384d4e308d5925">snd_pcm_access_mask_copy</a> (<a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> *dst, const <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> *src)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">copy one <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> to another <a href="#ga4fc7338c7c0cd715ea384d4e308d5925"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#gaa8202ce90275d6dfe2623cbacbc93708">snd_pcm_access_mask_none</a> (<a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> *mask)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">reset all bits in a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> <a href="#gaa8202ce90275d6dfe2623cbacbc93708"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#ga76b2575826977951a862c5e78e81993c">snd_pcm_access_mask_any</a> (<a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> *mask)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">set all bits in a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> <a href="#ga76b2575826977951a862c5e78e81993c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#ga381ade7f78d8614b38dde36ba0393f74">snd_pcm_access_mask_test</a> (const <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> *mask, <a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> val)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">test the presence of an access type in a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> <a href="#ga381ade7f78d8614b38dde36ba0393f74"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#ga224e84b7b1362aea503b0595512bac77">snd_pcm_access_mask_empty</a> (const <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> *mask)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">test, if given a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> is empty <a href="#ga224e84b7b1362aea503b0595512bac77"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#gadc0a0f989a9faca8b25b2c35d4b14e14">snd_pcm_access_mask_set</a> (<a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> *mask, <a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> val)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">make an access type present in a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> <a href="#gadc0a0f989a9faca8b25b2c35d4b14e14"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___access.html#ga35c6aaf5b55ef8dd1c4939467869db86">snd_pcm_access_mask_reset</a> (<a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> *mask, <a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> val)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">make an access type missing from a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> <a href="#ga35c6aaf5b55ef8dd1c4939467869db86"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>See the <a class="el" href="pcm.html">PCM (digital audio) interface</a> page for more details. </p>
<hr/><h2>Define Documentation</h2>
<a class="anchor" id="ga8097b3ae42fa4a2e5bece2ca95b515b7"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_alloca" ref="ga8097b3ae42fa4a2e5bece2ca95b515b7" args="(ptr)" -->
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<td class="memname">#define snd_pcm_access_mask_alloca</td>
<td>(</td>
<td class="paramtype">ptr </td>
<td class="paramname"></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>allocate an empty <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> using standard alloca </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>ptr</em> </td><td>returned pointer </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga76b2575826977951a862c5e78e81993c"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_any" ref="ga76b2575826977951a862c5e78e81993c" args="(snd_pcm_access_mask_t *mask)" -->
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<div class="memproto">
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<td class="memname">void snd_pcm_access_mask_any </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> * </td>
<td class="paramname"> <em>mask</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>set all bits in a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mask</em> </td><td>pointer to mask </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga4fc7338c7c0cd715ea384d4e308d5925"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_copy" ref="ga4fc7338c7c0cd715ea384d4e308d5925" args="(snd_pcm_access_mask_t *dst, const snd_pcm_access_mask_t *src)" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">void snd_pcm_access_mask_copy </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> * </td>
<td class="paramname"> <em>dst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> * </td>
<td class="paramname"> <em>src</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>copy one <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> to another </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dst</em> </td><td>pointer to destination </td></tr>
<tr><td valign="top"></td><td valign="top"><em>src</em> </td><td>pointer to source </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga224e84b7b1362aea503b0595512bac77"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_empty" ref="ga224e84b7b1362aea503b0595512bac77" args="(const snd_pcm_access_mask_t *mask)" -->
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<div class="memproto">
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<td class="memname">int snd_pcm_access_mask_empty </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> * </td>
<td class="paramname"> <em>mask</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>test, if given a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> is empty </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mask</em> </td><td>pointer to mask </td></tr>
</table>
</dd>
</dl>
<dl><dt><b>Return values:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>0</em> </td><td>not empty </td></tr>
<tr><td valign="top"></td><td valign="top"><em>1</em> </td><td>empty </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga965129493161fae3ab534209b7e6b2bc"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_free" ref="ga965129493161fae3ab534209b7e6b2bc" args="(snd_pcm_access_mask_t *obj)" -->
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<td class="memname">void snd_pcm_access_mask_free </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> * </td>
<td class="paramname"> <em>obj</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>frees a previously allocated <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>obj</em> </td><td>pointer to object to free </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="gafedd1f9c96aa8a93ab7f2c0135de3780"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_malloc" ref="gafedd1f9c96aa8a93ab7f2c0135de3780" args="(snd_pcm_access_mask_t **ptr)" -->
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<div class="memproto">
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<td class="memname">int snd_pcm_access_mask_malloc </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> ** </td>
<td class="paramname"> <em>ptr</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>allocate an empty <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> using standard malloc </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>ptr</em> </td><td>returned pointer </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0 on success otherwise negative error code </dd></dl>
</div>
</div>
<a class="anchor" id="gaa8202ce90275d6dfe2623cbacbc93708"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_none" ref="gaa8202ce90275d6dfe2623cbacbc93708" args="(snd_pcm_access_mask_t *mask)" -->
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<td class="memname">void snd_pcm_access_mask_none </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> * </td>
<td class="paramname"> <em>mask</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>reset all bits in a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mask</em> </td><td>pointer to mask </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga35c6aaf5b55ef8dd1c4939467869db86"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_reset" ref="ga35c6aaf5b55ef8dd1c4939467869db86" args="(snd_pcm_access_mask_t *mask, snd_pcm_access_t val)" -->
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<td class="memname">void snd_pcm_access_mask_reset </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> * </td>
<td class="paramname"> <em>mask</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> </td>
<td class="paramname"> <em>val</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>make an access type missing from a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mask</em> </td><td>pointer to mask </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>access type </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="gadc0a0f989a9faca8b25b2c35d4b14e14"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_set" ref="gadc0a0f989a9faca8b25b2c35d4b14e14" args="(snd_pcm_access_mask_t *mask, snd_pcm_access_t val)" -->
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<td class="memname">void snd_pcm_access_mask_set </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> * </td>
<td class="paramname"> <em>mask</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> </td>
<td class="paramname"> <em>val</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>make an access type present in a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mask</em> </td><td>pointer to mask </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>access type </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga963ead3f1169f4b5e03a2968adc9cb0a"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_sizeof" ref="ga963ead3f1169f4b5e03a2968adc9cb0a" args="(void)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">size_t snd_pcm_access_mask_sizeof </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>get size of <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>size in bytes </dd></dl>
</div>
</div>
<a class="anchor" id="ga381ade7f78d8614b38dde36ba0393f74"></a><!-- doxytag: member="pcm.h::snd_pcm_access_mask_test" ref="ga381ade7f78d8614b38dde36ba0393f74" args="(const snd_pcm_access_mask_t *mask, snd_pcm_access_t val)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int snd_pcm_access_mask_test </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> * </td>
<td class="paramname"> <em>mask</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga661221ba5e8f1d6eaf4ab8e2da57cc1a">snd_pcm_access_t</a> </td>
<td class="paramname"> <em>val</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>test the presence of an access type in a <a class="el" href="group___p_c_m.html#ga7f9575bcc94c7c2cf5d688a45c16ffba">snd_pcm_access_mask_t</a> </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mask</em> </td><td>pointer to mask </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>access type </td></tr>
</table>
</dd>
</dl>
</div>
</div>
</div>
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