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<h1>External Filter plugin SDK<br/>
<small>
[<a class="el" href="group___plugin___s_d_k.html">External PCM plugin SDK</a>]</small>
</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Data Structures</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__pcm__extplug.html">snd_pcm_extplug_t</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structsnd__pcm__extplug__callback.html">snd_pcm_extplug_callback_t</a></td></tr>
<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___ext_plug.html#ga82e7bf8a5b451792195a70cb74e31fc4">SND_PCM_EXTPLUG_VERSION_MAJOR</a> 1</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___ext_plug.html#ga40f40d20f8683751fdbb25b1f9ed013c">SND_PCM_EXTPLUG_VERSION_MINOR</a> 0</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___ext_plug.html#ga685e379757c606a4d2a7fcc969cc5dc1">SND_PCM_EXTPLUG_VERSION_TINY</a> 1</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___ext_plug.html#ga24d0ae71d106f08685d9ba8c6cf5fe78">SND_PCM_EXTPLUG_VERSION</a></td></tr>
<tr><td colspan="2"><h2>Enumerations</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum </td><td class="memItemRight" valign="bottom">{ <a class="el" href="group___p_c_m___ext_plug.html#gga61dadd085c1777f559549e05962b2c9ea627234d455a7d4652aacead45cf650ab">SND_PCM_EXTPLUG_HW_FORMAT</a>,
<a class="el" href="group___p_c_m___ext_plug.html#gga61dadd085c1777f559549e05962b2c9ea24eab971805f640763f6ffd9f60875dd">SND_PCM_EXTPLUG_HW_CHANNELS</a>,
<a class="el" href="group___p_c_m___ext_plug.html#gga61dadd085c1777f559549e05962b2c9eae359079bba1fec51841cd82179961801">SND_PCM_EXTPLUG_HW_PARAMS</a>
}</td></tr>
<tr><td colspan="2"><h2>Functions</h2></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___ext_plug.html#gab0b27889f74c83cd033062981320fd62">snd_pcm_extplug_create</a> (snd_pcm_extplug_t *ext, const char *name, <a class="el" href="group___config.html#ga1c20905af775ae77d04d1a5696f67985">snd_config_t</a> *root, <a class="el" href="group___config.html#ga1c20905af775ae77d04d1a5696f67985">snd_config_t</a> *slave_conf, <a class="el" href="group___p_c_m.html#gac23b43ff55add78638e503b9cc892c24">snd_pcm_stream_t</a> stream, int mode)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Create an extplug instance. <a href="#gab0b27889f74c83cd033062981320fd62"></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___ext_plug.html#ga7259292a6f64a2432f4c2a44bb5f8508">snd_pcm_extplug_delete</a> (snd_pcm_extplug_t *ext)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Delete the extplug instance. <a href="#ga7259292a6f64a2432f4c2a44bb5f8508"></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___ext_plug.html#gacef181565eb697397ce41c1aab381777">snd_pcm_extplug_params_reset</a> (snd_pcm_extplug_t *ext)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reset extplug parameters. <a href="#gacef181565eb697397ce41c1aab381777"></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___ext_plug.html#gadbf27adba1a7cd0195b6ac750bb11bf7">snd_pcm_extplug_set_param_list</a> (snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set master parameter as the list. <a href="#gadbf27adba1a7cd0195b6ac750bb11bf7"></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___ext_plug.html#gabef139bbe5db265433fd5310d0faad4d">snd_pcm_extplug_set_param_minmax</a> (snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set master parameter as the min/max values. <a href="#gabef139bbe5db265433fd5310d0faad4d"></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___ext_plug.html#gad14f6746e36d556c7a7937633b965ca7">snd_pcm_extplug_set_slave_param_list</a> (snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set slave parameter as the list. <a href="#gad14f6746e36d556c7a7937633b965ca7"></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___ext_plug.html#gad3cac0ee15293f349220a75cce69a51e">snd_pcm_extplug_set_slave_param_minmax</a> (snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set slave parameter as the min/max values. <a href="#gad3cac0ee15293f349220a75cce69a51e"></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="ga24d0ae71d106f08685d9ba8c6cf5fe78"></a><!-- doxytag: member="pcm_extplug.h::SND_PCM_EXTPLUG_VERSION" ref="ga24d0ae71d106f08685d9ba8c6cf5fe78" args="" -->
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<td class="memname">#define SND_PCM_EXTPLUG_VERSION</td>
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<b>Value:</b><div class="fragment"><pre class="fragment">((<a class="code" href="group___p_c_m___ext_plug.html#ga82e7bf8a5b451792195a70cb74e31fc4">SND_PCM_EXTPLUG_VERSION_MAJOR</a><<16) |\
(<a class="code" href="group___p_c_m___ext_plug.html#ga40f40d20f8683751fdbb25b1f9ed013c">SND_PCM_EXTPLUG_VERSION_MINOR</a><<8) |\
(<a class="code" href="group___p_c_m___ext_plug.html#ga685e379757c606a4d2a7fcc969cc5dc1">SND_PCM_EXTPLUG_VERSION_TINY</a>))
</pre></div><p>Filter-plugin protocol version </p>
</div>
</div>
<a class="anchor" id="ga82e7bf8a5b451792195a70cb74e31fc4"></a><!-- doxytag: member="pcm_extplug.h::SND_PCM_EXTPLUG_VERSION_MAJOR" ref="ga82e7bf8a5b451792195a70cb74e31fc4" args="" -->
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<td class="memname">#define SND_PCM_EXTPLUG_VERSION_MAJOR 1</td>
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<p>Protocol major version </p>
</div>
</div>
<a class="anchor" id="ga40f40d20f8683751fdbb25b1f9ed013c"></a><!-- doxytag: member="pcm_extplug.h::SND_PCM_EXTPLUG_VERSION_MINOR" ref="ga40f40d20f8683751fdbb25b1f9ed013c" args="" -->
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<td class="memname">#define SND_PCM_EXTPLUG_VERSION_MINOR 0</td>
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<p>Protocol minor version </p>
</div>
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<a class="anchor" id="ga685e379757c606a4d2a7fcc969cc5dc1"></a><!-- doxytag: member="pcm_extplug.h::SND_PCM_EXTPLUG_VERSION_TINY" ref="ga685e379757c606a4d2a7fcc969cc5dc1" args="" -->
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<td class="memname">#define SND_PCM_EXTPLUG_VERSION_TINY 1</td>
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<p>Protocol tiny version </p>
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</div>
<hr/><h2>Enumeration Type Documentation</h2>
<a class="anchor" id="ga61dadd085c1777f559549e05962b2c9e"></a><!-- doxytag: member="pcm_extplug.h::@5" ref="ga61dadd085c1777f559549e05962b2c9e" args="" -->
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<td class="memname">anonymous enum</td>
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<p>hw constraints for extplug </p>
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="gga61dadd085c1777f559549e05962b2c9ea627234d455a7d4652aacead45cf650ab"></a><!-- doxytag: member="SND_PCM_EXTPLUG_HW_FORMAT" ref="gga61dadd085c1777f559549e05962b2c9ea627234d455a7d4652aacead45cf650ab" args="" -->SND_PCM_EXTPLUG_HW_FORMAT</em> </td><td>
<p>format </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga61dadd085c1777f559549e05962b2c9ea24eab971805f640763f6ffd9f60875dd"></a><!-- doxytag: member="SND_PCM_EXTPLUG_HW_CHANNELS" ref="gga61dadd085c1777f559549e05962b2c9ea24eab971805f640763f6ffd9f60875dd" args="" -->SND_PCM_EXTPLUG_HW_CHANNELS</em> </td><td>
<p>channels </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga61dadd085c1777f559549e05962b2c9eae359079bba1fec51841cd82179961801"></a><!-- doxytag: member="SND_PCM_EXTPLUG_HW_PARAMS" ref="gga61dadd085c1777f559549e05962b2c9eae359079bba1fec51841cd82179961801" args="" -->SND_PCM_EXTPLUG_HW_PARAMS</em> </td><td>
<p>max number of hw constraints </p>
</td></tr>
</table>
</dd>
</dl>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="gab0b27889f74c83cd033062981320fd62"></a><!-- doxytag: member="pcm_extplug.h::snd_pcm_extplug_create" ref="gab0b27889f74c83cd033062981320fd62" args="(snd_pcm_extplug_t *ext, const char *name, snd_config_t *root, snd_config_t *slave_conf, snd_pcm_stream_t stream, int mode)" -->
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<td class="memname">int snd_pcm_extplug_create </td>
<td>(</td>
<td class="paramtype">snd_pcm_extplug_t * </td>
<td class="paramname"> <em>extplug</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>name</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___config.html#ga1c20905af775ae77d04d1a5696f67985">snd_config_t</a> * </td>
<td class="paramname"> <em>root</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___config.html#ga1c20905af775ae77d04d1a5696f67985">snd_config_t</a> * </td>
<td class="paramname"> <em>slave_conf</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gac23b43ff55add78638e503b9cc892c24">snd_pcm_stream_t</a> </td>
<td class="paramname"> <em>stream</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>mode</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<p>Create an extplug instance. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>extplug</em> </td><td>the extplug handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>name of the PCM </td></tr>
<tr><td valign="top"></td><td valign="top"><em>root</em> </td><td>configuration tree root </td></tr>
<tr><td valign="top"></td><td valign="top"><em>slave_conf</em> </td><td>slave configuration root </td></tr>
<tr><td valign="top"></td><td valign="top"><em>stream</em> </td><td>stream direction </td></tr>
<tr><td valign="top"></td><td valign="top"><em>mode</em> </td><td>PCM open mode </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl>
<p>Creates the extplug instance based on the given handle. The slave_conf argument is mandatory, and usually taken from the config tree of the PCM plugin as "slave" config value. name, root, stream and mode arguments are the values used for opening the PCM.</p>
<p>The callback is the mandatory field of extplug handle. At least, start, stop and pointer callbacks must be set before calling this function. </p>
</div>
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<a class="anchor" id="ga7259292a6f64a2432f4c2a44bb5f8508"></a><!-- doxytag: member="pcm_extplug.h::snd_pcm_extplug_delete" ref="ga7259292a6f64a2432f4c2a44bb5f8508" args="(snd_pcm_extplug_t *ext)" -->
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<td class="memname">int snd_pcm_extplug_delete </td>
<td>(</td>
<td class="paramtype">snd_pcm_extplug_t * </td>
<td class="paramname"> <em>extplug</em></td>
<td> ) </td>
<td></td>
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<p>Delete the extplug instance. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>extplug</em> </td><td>the extplug handle to delete </td></tr>
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</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl>
<p>The destructor of extplug instance. Closes the PCM and deletes the associated resources. </p>
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<a class="anchor" id="gacef181565eb697397ce41c1aab381777"></a><!-- doxytag: member="pcm_extplug.h::snd_pcm_extplug_params_reset" ref="gacef181565eb697397ce41c1aab381777" args="(snd_pcm_extplug_t *ext)" -->
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<td class="memname">void snd_pcm_extplug_params_reset </td>
<td>(</td>
<td class="paramtype">snd_pcm_extplug_t * </td>
<td class="paramname"> <em>extplug</em></td>
<td> ) </td>
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<p>Reset extplug parameters. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>extplug</em> </td><td>the extplug handle</td></tr>
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</dd>
</dl>
<p>Resets the all parameters for the given extplug handle. </p>
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<a class="anchor" id="gadbf27adba1a7cd0195b6ac750bb11bf7"></a><!-- doxytag: member="pcm_extplug.h::snd_pcm_extplug_set_param_list" ref="gadbf27adba1a7cd0195b6ac750bb11bf7" args="(snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list)" -->
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<td class="memname">int snd_pcm_extplug_set_param_list </td>
<td>(</td>
<td class="paramtype">snd_pcm_extplug_t * </td>
<td class="paramname"> <em>extplug</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>type</em>, </td>
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<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>num_list</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const unsigned int * </td>
<td class="paramname"> <em>list</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<p>Set master parameter as the list. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>extplug</em> </td><td>the extplug handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>type</em> </td><td>parameter type </td></tr>
<tr><td valign="top"></td><td valign="top"><em>num_list</em> </td><td>number of available values </td></tr>
<tr><td valign="top"></td><td valign="top"><em>list</em> </td><td>the list of available values </td></tr>
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</dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl>
<p>Sets the master parameter as the list. The available values of the given parameter type of this PCM (as input) is restricted to the ones of the given list. </p>
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<a class="anchor" id="gabef139bbe5db265433fd5310d0faad4d"></a><!-- doxytag: member="pcm_extplug.h::snd_pcm_extplug_set_param_minmax" ref="gabef139bbe5db265433fd5310d0faad4d" args="(snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max)" -->
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<td class="memname">int snd_pcm_extplug_set_param_minmax </td>
<td>(</td>
<td class="paramtype">snd_pcm_extplug_t * </td>
<td class="paramname"> <em>extplug</em>, </td>
</tr>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>type</em>, </td>
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<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>min</em>, </td>
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<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>max</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<p>Set master parameter as the min/max values. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>extplug</em> </td><td>the extplug handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>type</em> </td><td>parameter type </td></tr>
<tr><td valign="top"></td><td valign="top"><em>min</em> </td><td>the minimum value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>max</em> </td><td>the maximum value </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl>
<p>Sets the master parameter as the min/max values. The available values of the given parameter type of this PCM (as input) is restricted between the given minimum and maximum values. </p>
</div>
</div>
<a class="anchor" id="gad14f6746e36d556c7a7937633b965ca7"></a><!-- doxytag: member="pcm_extplug.h::snd_pcm_extplug_set_slave_param_list" ref="gad14f6746e36d556c7a7937633b965ca7" args="(snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int snd_pcm_extplug_set_slave_param_list </td>
<td>(</td>
<td class="paramtype">snd_pcm_extplug_t * </td>
<td class="paramname"> <em>extplug</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>type</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>num_list</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned int * </td>
<td class="paramname"> <em>list</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set slave parameter as the list. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>extplug</em> </td><td>the extplug handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>type</em> </td><td>parameter type </td></tr>
<tr><td valign="top"></td><td valign="top"><em>num_list</em> </td><td>number of available values </td></tr>
<tr><td valign="top"></td><td valign="top"><em>list</em> </td><td>the list of available values </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl>
<p>Sets the slave parameter as the list. The available values of the given parameter type of the slave PCM is restricted to the ones of the given list. </p>
</div>
</div>
<a class="anchor" id="gad3cac0ee15293f349220a75cce69a51e"></a><!-- doxytag: member="pcm_extplug.h::snd_pcm_extplug_set_slave_param_minmax" ref="gad3cac0ee15293f349220a75cce69a51e" args="(snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int snd_pcm_extplug_set_slave_param_minmax </td>
<td>(</td>
<td class="paramtype">snd_pcm_extplug_t * </td>
<td class="paramname"> <em>extplug</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>type</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>min</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>max</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set slave parameter as the min/max values. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>extplug</em> </td><td>the extplug handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>type</em> </td><td>parameter type </td></tr>
<tr><td valign="top"></td><td valign="top"><em>min</em> </td><td>the minimum value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>max</em> </td><td>the maximum value </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0 if successful, or a negative error code</dd></dl>
<p>Sets the slave parameter as the min/max values. The available values of the given parameter type of the slave PCM is restricted between the given minimum and maximum values. </p>
</div>
</div>
</div>
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