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<div class="title">Hook Extension<div class="ingroups"><a class="el" href="group___p_c_m.html">PCM Interface</a></div></div> </div>
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Files</h2></td></tr>
<tr class="memitem:pcm__hooks_8c"><td class="memItemLeft" align="right" valign="top">file  </td><td class="memItemRight" valign="bottom"><a class="el" href="pcm__hooks_8c.html">pcm_hooks.c</a></td></tr>
<tr class="memdesc:pcm__hooks_8c"><td class="mdescLeft"> </td><td class="mdescRight">PCM Hook Interface. <br /></td></tr>
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Typedefs</h2></td></tr>
<tr class="memitem:gae6b33860eeaf4eca00bdbef9383c1911"><td class="memItemLeft" align="right" valign="top">typedef struct _snd_pcm_hook </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a></td></tr>
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<tr class="memitem:gaff0efa33d6ffbe1df2492ad0d30df309"><td class="memItemLeft" align="right" valign="top">typedef int(* </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___hook.html#gaff0efa33d6ffbe1df2492ad0d30df309">snd_pcm_hook_func_t</a> )(<a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> *hook)</td></tr>
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Enumerations</h2></td></tr>
<tr class="memitem:ga57b6ba407d293017e116fa1b462a2411"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___hook.html#ga57b6ba407d293017e116fa1b462a2411">snd_pcm_hook_type_t</a> { <b>SND_PCM_HOOK_TYPE_HW_PARAMS</b> = 0,
<b>SND_PCM_HOOK_TYPE_HW_FREE</b>,
<b>SND_PCM_HOOK_TYPE_CLOSE</b>,
<b>SND_PCM_HOOK_TYPE_LAST</b> = SND_PCM_HOOK_TYPE_CLOSE
}</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:gacaec88e4b6cc2a45e7a805487acd64ed"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___hook.html#gacaec88e4b6cc2a45e7a805487acd64ed">snd_pcm_hook_get_pcm</a> (<a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> *hook)</td></tr>
<tr class="memdesc:gacaec88e4b6cc2a45e7a805487acd64ed"><td class="mdescLeft"> </td><td class="mdescRight">Get PCM handle for a PCM hook. <a href="#gacaec88e4b6cc2a45e7a805487acd64ed">More...</a><br /></td></tr>
<tr class="separator:gacaec88e4b6cc2a45e7a805487acd64ed"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga1eb467cd5ab11817edc2ed7df3608019"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___hook.html#ga1eb467cd5ab11817edc2ed7df3608019">snd_pcm_hook_get_private</a> (<a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> *hook)</td></tr>
<tr class="memdesc:ga1eb467cd5ab11817edc2ed7df3608019"><td class="mdescLeft"> </td><td class="mdescRight">Get callback function private data for a PCM hook. <a href="#ga1eb467cd5ab11817edc2ed7df3608019">More...</a><br /></td></tr>
<tr class="separator:ga1eb467cd5ab11817edc2ed7df3608019"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga6930df3b750b3f62dee6846fb3f6a576"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___hook.html#ga6930df3b750b3f62dee6846fb3f6a576">snd_pcm_hook_set_private</a> (<a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> *hook, void *private_data)</td></tr>
<tr class="memdesc:ga6930df3b750b3f62dee6846fb3f6a576"><td class="mdescLeft"> </td><td class="mdescRight">Set callback function private data for a PCM hook. <a href="#ga6930df3b750b3f62dee6846fb3f6a576">More...</a><br /></td></tr>
<tr class="separator:ga6930df3b750b3f62dee6846fb3f6a576"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga89eed2fdcda68c1efae9180a3794d5ef"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___hook.html#ga89eed2fdcda68c1efae9180a3794d5ef">snd_pcm_hook_add</a> (<a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> **hookp, <a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *pcm, <a class="el" href="group___p_c_m___hook.html#ga57b6ba407d293017e116fa1b462a2411">snd_pcm_hook_type_t</a> type, <a class="el" href="group___p_c_m___hook.html#gaff0efa33d6ffbe1df2492ad0d30df309">snd_pcm_hook_func_t</a> func, void *private_data)</td></tr>
<tr class="memdesc:ga89eed2fdcda68c1efae9180a3794d5ef"><td class="mdescLeft"> </td><td class="mdescRight">Add a PCM hook at end of hooks chain. <a href="#ga89eed2fdcda68c1efae9180a3794d5ef">More...</a><br /></td></tr>
<tr class="separator:ga89eed2fdcda68c1efae9180a3794d5ef"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga4c59ad440d2479f957b477b26b90e4b1"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___hook.html#ga4c59ad440d2479f957b477b26b90e4b1">snd_pcm_hook_remove</a> (<a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> *hook)</td></tr>
<tr class="memdesc:ga4c59ad440d2479f957b477b26b90e4b1"><td class="mdescLeft"> </td><td class="mdescRight">Remove a PCM hook. <a href="#ga4c59ad440d2479f957b477b26b90e4b1">More...</a><br /></td></tr>
<tr class="separator:ga4c59ad440d2479f957b477b26b90e4b1"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>See the <a class="el" href="pcm.html">PCM (digital audio) interface</a> page for more details. </p>
<h2 class="groupheader">Typedef Documentation</h2>
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<td class="memname">typedef int(* snd_pcm_hook_func_t)(<a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> *hook)</td>
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<p>PCM hook callback function </p>
</div>
</div>
<a class="anchor" id="gae6b33860eeaf4eca00bdbef9383c1911"></a>
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<td class="memname">typedef struct _snd_pcm_hook <a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a></td>
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<p>PCM hook container </p>
</div>
</div>
<h2 class="groupheader">Enumeration Type Documentation</h2>
<a class="anchor" id="ga57b6ba407d293017e116fa1b462a2411"></a>
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<td class="memname">enum <a class="el" href="group___p_c_m___hook.html#ga57b6ba407d293017e116fa1b462a2411">snd_pcm_hook_type_t</a></td>
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<p>type of pcm hook </p>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
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<td class="memname">int snd_pcm_hook_add </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> ** </td>
<td class="paramname"><em>hookp</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td>
<td class="paramname"><em>pcm</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m___hook.html#ga57b6ba407d293017e116fa1b462a2411">snd_pcm_hook_type_t</a> </td>
<td class="paramname"><em>type</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m___hook.html#gaff0efa33d6ffbe1df2492ad0d30df309">snd_pcm_hook_func_t</a> </td>
<td class="paramname"><em>func</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>private_data</em> </td>
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<td>)</td>
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<p>Add a PCM hook at end of hooks chain. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">hookp</td><td>Returned PCM hook handle </td></tr>
<tr><td class="paramname">pcm</td><td>PCM handle </td></tr>
<tr><td class="paramname">type</td><td>PCM hook type </td></tr>
<tr><td class="paramname">func</td><td>PCM hook callback function </td></tr>
<tr><td class="paramname">private_data</td><td>PCM hook private data </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success otherwise a negative error code</dd></dl>
<p>Warning: an hook callback function cannot remove an hook of the same type different from itself </p>
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<td class="memname"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a>* snd_pcm_hook_get_pcm </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> * </td>
<td class="paramname"><em>hook</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Get PCM handle for a PCM hook. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">hook</td><td>PCM hook handle </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>PCM handle </dd></dl>
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<td class="memname">void* snd_pcm_hook_get_private </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> * </td>
<td class="paramname"><em>hook</em></td><td>)</td>
<td></td>
</tr>
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</div><div class="memdoc">
<p>Get callback function private data for a PCM hook. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">hook</td><td>PCM hook handle </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>callback function private data </dd></dl>
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<td class="memname">int snd_pcm_hook_remove </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> * </td>
<td class="paramname"><em>hook</em></td><td>)</td>
<td></td>
</tr>
</table>
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<p>Remove a PCM hook. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">hook</td><td>PCM hook handle </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success otherwise a negative error code</dd></dl>
<p>Warning: an hook callback cannot remove an hook of the same type different from itself </p>
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<td class="memname">void snd_pcm_hook_set_private </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m___hook.html#gae6b33860eeaf4eca00bdbef9383c1911">snd_pcm_hook_t</a> * </td>
<td class="paramname"><em>hook</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>private_data</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Set callback function private data for a PCM hook. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">hook</td><td>PCM hook handle </td></tr>
<tr><td class="paramname">private_data</td><td>The private data value </td></tr>
</table>
</dd>
</dl>
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