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<h1>MIDI Sequencer</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Modules</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___seq_client.html">Sequencer Client Interface</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___seq_port.html">Sequencer Port Interface</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___seq_subscribe.html">Sequencer Port Subscription</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___seq_queue.html">Sequencer Queue Interface</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___seq_event.html">Sequencer Event API</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___seq_misc.html">Sequencer Miscellaneous</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___seq_ev_type.html">Sequencer Event Type Checks</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___seq_events.html">Sequencer Event Definitions</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___seq_middle.html">Sequencer Middle Level Interface</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_i_d_i___event.html">Sequencer event <-> MIDI byte stream coder</a></td></tr>
<tr><td colspan="2"><br><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gf8a4579caf97fca067e6835d9594ff04">SND_SEQ_DLSYM_VERSION</a> _dlsym_seq_001</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g5e81787eb2d1b381307ea72fe1292427">SND_SEQ_OPEN_OUTPUT</a> 1</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gf144e67eb685df9e04cbd9af3c70d127">SND_SEQ_OPEN_INPUT</a> 2</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#ga683c3a4aa1dd9e5f403245314b59b0d">SND_SEQ_OPEN_DUPLEX</a> (SND_SEQ_OPEN_OUTPUT|SND_SEQ_OPEN_INPUT)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g988e0996a5de89e3ca0bffaf53adb63e">SND_SEQ_NONBLOCK</a> 0x0001</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g1f8b452b2c67c4aa992c519b8cbcc842">SND_SEQ_ADDRESS_UNKNOWN</a> 253</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g6540f2d8e765175bb6f082648d1d12fb">SND_SEQ_ADDRESS_SUBSCRIBERS</a> 254</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g82b2252edf13b4bac9b46e336f507f2e">SND_SEQ_ADDRESS_BROADCAST</a> 255</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g99fdba14f37a55f4ebe38bc35f8b93bb">SND_SEQ_CLIENT_SYSTEM</a> 0</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gcee3b7b81a9ded4dc1de7e2bb4fea2b1">snd_seq_system_info_alloca</a>(ptr) __snd_alloca(ptr, snd_seq_system_info)</td></tr>
<tr><td colspan="2"><br><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef _snd_seq </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef enum <a class="el" href="group___sequencer.html#g85d657f4ddaa38547f4269056aee327d">_snd_seq_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gc0a8306b70ba1821d09beebae876ec3c">snd_seq_type_t</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef _snd_seq_system_info </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a></td></tr>
<tr><td colspan="2"><br><h2>Enumerations</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g85d657f4ddaa38547f4269056aee327d">_snd_seq_type</a> { <a class="el" href="group___sequencer.html#gg85d657f4ddaa38547f4269056aee327db293be18b4a3845886fa8c3982a499bd">SND_SEQ_TYPE_HW</a>,
<a class="el" href="group___sequencer.html#gg85d657f4ddaa38547f4269056aee327dc3e6db70fc99edbaad3ddc6548476c13">SND_SEQ_TYPE_SHM</a>,
<a class="el" href="group___sequencer.html#gg85d657f4ddaa38547f4269056aee327dee439634430a8e9a3c4cc744da722182">SND_SEQ_TYPE_INET</a>
}</td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g939da4eeae96f1a57390bcda842cdc7b">snd_seq_open</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> **handle, const char *name, int streams, int mode)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Open the ALSA sequencer. <a href="#g939da4eeae96f1a57390bcda842cdc7b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gefcca772c2a48ae3e45abc33784628d0">snd_seq_open_lconf</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> **handle, const char *name, int streams, int mode, <a class="el" href="group___config.html#gb7dc173feea5bedcd999bba678eb53a7">snd_config_t</a> *lconf)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Open the ALSA sequencer using local configuration. <a href="#gefcca772c2a48ae3e45abc33784628d0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g3a0dcdb14a02fe16f12141e11cebb959">snd_seq_name</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *seq)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">get identifier of sequencer handle <a href="#g3a0dcdb14a02fe16f12141e11cebb959"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group___sequencer.html#gc0a8306b70ba1821d09beebae876ec3c">snd_seq_type_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g0025a3ac01ec8466e9cc8b0f1d537c41">snd_seq_type</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *seq)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">get type of sequencer handle <a href="#g0025a3ac01ec8466e9cc8b0f1d537c41"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gd9d224abfb59c0b8793506722f01e24b">snd_seq_close</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Close the sequencer. <a href="#gd9d224abfb59c0b8793506722f01e24b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gb7ea9b265ec21ce593ded14071135a3e">snd_seq_poll_descriptors_count</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle, short events)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the number of poll descriptors. <a href="#gb7ea9b265ec21ce593ded14071135a3e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g5086fbf4e38449108a0807fb5cf5e9c6">snd_seq_poll_descriptors</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle, struct pollfd *pfds, unsigned int space, short events)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get poll descriptors. <a href="#g5086fbf4e38449108a0807fb5cf5e9c6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g2023831b160997c8930d52ed977b64f4">snd_seq_poll_descriptors_revents</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *seq, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">get returned events from poll descriptors <a href="#g2023831b160997c8930d52ed977b64f4"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g4e2c3ba1d0db180b78f2e7b920d0b5ee">snd_seq_nonblock</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle, int nonblock)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set nonblock mode. <a href="#g4e2c3ba1d0db180b78f2e7b920d0b5ee"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g5175849d1b547a2413ec7cf8431651a0">snd_seq_client_id</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the client id. <a href="#g5175849d1b547a2413ec7cf8431651a0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g97db762587222954468250413bf34011">snd_seq_get_output_buffer_size</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the size of output buffer. <a href="#g97db762587222954468250413bf34011"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g1a9f7a6cefe7357deb177dea1dce15b9">snd_seq_get_input_buffer_size</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the size of input buffer. <a href="#g1a9f7a6cefe7357deb177dea1dce15b9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g12eb62d9dde6b5f4646bb21c68072d76">snd_seq_set_output_buffer_size</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle, size_t size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Change the size of output buffer. <a href="#g12eb62d9dde6b5f4646bb21c68072d76"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gd50134d3bfac0f788ab79b2e9fff9fc9">snd_seq_set_input_buffer_size</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle, size_t size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Resize the input buffer. <a href="#gd50134d3bfac0f788ab79b2e9fff9fc9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g7c446cc82d0f437b5a4cd684f0e75856">snd_seq_system_info_sizeof</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get size of <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a>. <a href="#g7c446cc82d0f437b5a4cd684f0e75856"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gd27466d786fe342a8c5c33bced51017b">snd_seq_system_info_malloc</a> (<a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> **ptr)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate an empty <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> using standard malloc. <a href="#gd27466d786fe342a8c5c33bced51017b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g31a8aa29e2127767261821217c58abef">snd_seq_system_info_free</a> (<a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *ptr)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Frees a previously allocated <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a>. <a href="#g31a8aa29e2127767261821217c58abef"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g97cf21100bb1242b173fb9a260fd3472">snd_seq_system_info_copy</a> (<a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *dst, const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *src)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Copy one <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> to another. <a href="#g97cf21100bb1242b173fb9a260fd3472"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g975201d0785e52b2bb4dac730a2eed47">snd_seq_system_info_get_queues</a> (const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get maximum number of queues. <a href="#g975201d0785e52b2bb4dac730a2eed47"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gfa5dfdb2a206838372b8959881328a33">snd_seq_system_info_get_clients</a> (const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get maximum number of clients. <a href="#gfa5dfdb2a206838372b8959881328a33"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g186cf68270ad2bc57b93523bef9531c9">snd_seq_system_info_get_ports</a> (const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get maximum number of ports. <a href="#g186cf68270ad2bc57b93523bef9531c9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gdf43fe5c784dbda03cb1de3116ea5772">snd_seq_system_info_get_channels</a> (const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get maximum number of channels. <a href="#gdf43fe5c784dbda03cb1de3116ea5772"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g6c0ab82ccc452be6846f349cd0aac93b">snd_seq_system_info_get_cur_clients</a> (const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current number of clients. <a href="#g6c0ab82ccc452be6846f349cd0aac93b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#g9f74f0e0daa9c3056f0cf707795ac5a4">snd_seq_system_info_get_cur_queues</a> (const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current number of queues. <a href="#g9f74f0e0daa9c3056f0cf707795ac5a4"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___sequencer.html#gd7e2ff62ed6e402c64cd3982766dc8a6">snd_seq_system_info</a> (<a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> *handle, <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> *info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">obtain the sequencer system information <a href="#gd7e2ff62ed6e402c64cd3982766dc8a6"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
MIDI Sequencer Interface. See <a class="el" href="seq.html">Sequencer interface</a> page for more details. <hr><h2>Define Documentation</h2>
<a class="anchor" name="g82b2252edf13b4bac9b46e336f507f2e"></a><!-- doxytag: member="seq.h::SND_SEQ_ADDRESS_BROADCAST" ref="g82b2252edf13b4bac9b46e336f507f2e" args="" -->
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<td class="memname">#define SND_SEQ_ADDRESS_BROADCAST 255 </td>
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<p>
send event to all queues/clients/ports/channels
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<a class="anchor" name="g6540f2d8e765175bb6f082648d1d12fb"></a><!-- doxytag: member="seq.h::SND_SEQ_ADDRESS_SUBSCRIBERS" ref="g6540f2d8e765175bb6f082648d1d12fb" args="" -->
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<td class="memname">#define SND_SEQ_ADDRESS_SUBSCRIBERS 254 </td>
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<p>
send event to all subscribed ports
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<a class="anchor" name="g1f8b452b2c67c4aa992c519b8cbcc842"></a><!-- doxytag: member="seq.h::SND_SEQ_ADDRESS_UNKNOWN" ref="g1f8b452b2c67c4aa992c519b8cbcc842" args="" -->
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<td class="memname">#define SND_SEQ_ADDRESS_UNKNOWN 253 </td>
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<p>
special client (port) ids unknown source
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<a class="anchor" name="g99fdba14f37a55f4ebe38bc35f8b93bb"></a><!-- doxytag: member="seq.h::SND_SEQ_CLIENT_SYSTEM" ref="g99fdba14f37a55f4ebe38bc35f8b93bb" args="" -->
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<td class="memname">#define SND_SEQ_CLIENT_SYSTEM 0 </td>
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<p>
known client numbers system client
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<a class="anchor" name="gf8a4579caf97fca067e6835d9594ff04"></a><!-- doxytag: member="seq.h::SND_SEQ_DLSYM_VERSION" ref="gf8a4579caf97fca067e6835d9594ff04" args="" -->
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<td class="memname">#define SND_SEQ_DLSYM_VERSION _dlsym_seq_001 </td>
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dlsym version for interface entry callback
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<a class="anchor" name="g988e0996a5de89e3ca0bffaf53adb63e"></a><!-- doxytag: member="seq.h::SND_SEQ_NONBLOCK" ref="g988e0996a5de89e3ca0bffaf53adb63e" args="" -->
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<td class="memname">#define SND_SEQ_NONBLOCK 0x0001 </td>
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<p>
sequencer opening mode non-blocking mode (flag to open mode)
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<a class="anchor" name="ga683c3a4aa1dd9e5f403245314b59b0d"></a><!-- doxytag: member="seq.h::SND_SEQ_OPEN_DUPLEX" ref="ga683c3a4aa1dd9e5f403245314b59b0d" args="" -->
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<td class="memname">#define SND_SEQ_OPEN_DUPLEX (SND_SEQ_OPEN_OUTPUT|SND_SEQ_OPEN_INPUT) </td>
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<p>
open for both input and output (read/write)
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<a class="anchor" name="gf144e67eb685df9e04cbd9af3c70d127"></a><!-- doxytag: member="seq.h::SND_SEQ_OPEN_INPUT" ref="gf144e67eb685df9e04cbd9af3c70d127" args="" -->
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<td class="memname">#define SND_SEQ_OPEN_INPUT 2 </td>
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open for input (read)
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<a class="anchor" name="g5e81787eb2d1b381307ea72fe1292427"></a><!-- doxytag: member="seq.h::SND_SEQ_OPEN_OUTPUT" ref="g5e81787eb2d1b381307ea72fe1292427" args="" -->
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<td class="memname">#define SND_SEQ_OPEN_OUTPUT 1 </td>
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<p>
sequencer opening stream types open for output (write)
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<a class="anchor" name="gcee3b7b81a9ded4dc1de7e2bb4fea2b1"></a><!-- doxytag: member="seq.h::snd_seq_system_info_alloca" ref="gcee3b7b81a9ded4dc1de7e2bb4fea2b1" args="(ptr)" -->
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<td class="memname">#define snd_seq_system_info_alloca </td>
<td>(</td>
<td class="paramtype">ptr </td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"> __snd_alloca(ptr, snd_seq_system_info)</td>
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allocate a <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> container on stack
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<hr><h2>Typedef Documentation</h2>
<a class="anchor" name="g72d8784184492f962fc74c3a76a1583a"></a><!-- doxytag: member="seq.h::snd_seq_system_info_t" ref="g72d8784184492f962fc74c3a76a1583a" args="" -->
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<td class="memname">typedef struct _snd_seq_system_info <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> </td>
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<p>
system information container
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<a class="anchor" name="g527eff2e3b3c7dd45cac6fdd2ceee964"></a><!-- doxytag: member="seq.h::snd_seq_t" ref="g527eff2e3b3c7dd45cac6fdd2ceee964" args="" -->
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<td class="memname">typedef struct _snd_seq <a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> </td>
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<p>
Sequencer handle
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<a class="anchor" name="gc0a8306b70ba1821d09beebae876ec3c"></a><!-- doxytag: member="seq.h::snd_seq_type_t" ref="gc0a8306b70ba1821d09beebae876ec3c" args="" -->
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<td class="memname">typedef enum <a class="el" href="group___sequencer.html#g85d657f4ddaa38547f4269056aee327d">_snd_seq_type</a> <a class="el" href="group___sequencer.html#gc0a8306b70ba1821d09beebae876ec3c">snd_seq_type_t</a> </td>
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<p>
sequencer handle type
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<hr><h2>Enumeration Type Documentation</h2>
<a class="anchor" name="g85d657f4ddaa38547f4269056aee327d"></a><!-- doxytag: member="seq.h::_snd_seq_type" ref="g85d657f4ddaa38547f4269056aee327d" args="" -->
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<td class="memname">enum <a class="el" href="group___sequencer.html#g85d657f4ddaa38547f4269056aee327d">_snd_seq_type</a> </td>
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sequencer handle type <dl compact><dt><b>Enumerator: </b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" name="gg85d657f4ddaa38547f4269056aee327db293be18b4a3845886fa8c3982a499bd"></a><!-- doxytag: member="SND_SEQ_TYPE_HW" ref="gg85d657f4ddaa38547f4269056aee327db293be18b4a3845886fa8c3982a499bd" args="" -->SND_SEQ_TYPE_HW</em> </td><td>
hardware </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg85d657f4ddaa38547f4269056aee327dc3e6db70fc99edbaad3ddc6548476c13"></a><!-- doxytag: member="SND_SEQ_TYPE_SHM" ref="gg85d657f4ddaa38547f4269056aee327dc3e6db70fc99edbaad3ddc6548476c13" args="" -->SND_SEQ_TYPE_SHM</em> </td><td>
shared memory (NYI) </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg85d657f4ddaa38547f4269056aee327dee439634430a8e9a3c4cc744da722182"></a><!-- doxytag: member="SND_SEQ_TYPE_INET" ref="gg85d657f4ddaa38547f4269056aee327dee439634430a8e9a3c4cc744da722182" args="" -->SND_SEQ_TYPE_INET</em> </td><td>
network (NYI) </td></tr>
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</dl>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="g5175849d1b547a2413ec7cf8431651a0"></a><!-- doxytag: member="seq.h::snd_seq_client_id" ref="g5175849d1b547a2413ec7cf8431651a0" args="(snd_seq_t *handle)" -->
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<td class="memname">int snd_seq_client_id </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em> </td>
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<p>
Get the client id.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>the client id</dd></dl>
Returns the id of the specified client. If an error occurs, function returns the negative error code. A client id is necessary to inquiry or to set the client information. A user client is assigned from 128 to 191.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g939da4eeae96f1a57390bcda842cdc7b">snd_seq_open()</a> </dd></dl>
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<a class="anchor" name="gd9d224abfb59c0b8793506722f01e24b"></a><!-- doxytag: member="seq.h::snd_seq_close" ref="gd9d224abfb59c0b8793506722f01e24b" args="(snd_seq_t *handle)" -->
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<td class="memname">int snd_seq_close </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em> </td>
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<p>
Close the sequencer.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>Handle returned from <a class="el" href="group___sequencer.html#g939da4eeae96f1a57390bcda842cdc7b">snd_seq_open()</a> </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on success otherwise a negative error code</dd></dl>
Closes the sequencer client and releases its resources. After a client is closed, an event with <a class="el" href="group___seq_events.html#gg644c72e4af4461703b3fe43a7dfa5cda7dc51738930b81328b1f8cdcb7b383e0">SND_SEQ_EVENT_CLIENT_EXIT</a> is broadcast to announce port. The connection between other clients are disconnected. Call this just before exiting your program.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gd9d224abfb59c0b8793506722f01e24b">snd_seq_close()</a> </dd></dl>
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<a class="anchor" name="g1a9f7a6cefe7357deb177dea1dce15b9"></a><!-- doxytag: member="seq.h::snd_seq_get_input_buffer_size" ref="g1a9f7a6cefe7357deb177dea1dce15b9" args="(snd_seq_t *handle)" -->
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<td class="memname">size_t snd_seq_get_input_buffer_size </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em> </td>
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<p>
Return the size of input buffer.
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>the size of input buffer in bytes</dd></dl>
Obtains the size of input buffer. This buffer is used to read byte-stream of input events from sequencer.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gd50134d3bfac0f788ab79b2e9fff9fc9">snd_seq_set_input_buffer_size()</a> </dd></dl>
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<a class="anchor" name="g97db762587222954468250413bf34011"></a><!-- doxytag: member="seq.h::snd_seq_get_output_buffer_size" ref="g97db762587222954468250413bf34011" args="(snd_seq_t *handle)" -->
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<td class="memname">size_t snd_seq_get_output_buffer_size </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em> </td>
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<p>
Return the size of output buffer.
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>the size of output buffer in bytes</dd></dl>
Obtains the size of output buffer. This buffer is used to store decoded byte-stream of output events before transferring to sequencer.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g12eb62d9dde6b5f4646bb21c68072d76">snd_seq_set_output_buffer_size()</a> </dd></dl>
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<a class="anchor" name="g3a0dcdb14a02fe16f12141e11cebb959"></a><!-- doxytag: member="seq.h::snd_seq_name" ref="g3a0dcdb14a02fe16f12141e11cebb959" args="(snd_seq_t *seq)" -->
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<td class="memname">const char* snd_seq_name </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em> </td>
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<p>
get identifier of sequencer handle
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>ascii identifier of sequencer handle</dd></dl>
Returns the ASCII identifier of the given sequencer handle. It's the same identifier specified in <a class="el" href="group___sequencer.html#g939da4eeae96f1a57390bcda842cdc7b">snd_seq_open()</a>.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g939da4eeae96f1a57390bcda842cdc7b">snd_seq_open()</a> </dd></dl>
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<a class="anchor" name="g4e2c3ba1d0db180b78f2e7b920d0b5ee"></a><!-- doxytag: member="seq.h::snd_seq_nonblock" ref="g4e2c3ba1d0db180b78f2e7b920d0b5ee" args="(snd_seq_t *handle, int nonblock)" -->
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<td class="memname">int snd_seq_nonblock </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>nonblock</em></td><td> </td>
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<p>
Set nonblock mode.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>nonblock</em> </td><td>0 = block, 1 = nonblock mode </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on success otherwise a negative error code</dd></dl>
Change the blocking mode of the given client. In block mode, the client falls into sleep when it fills the output memory pool with full events. The client will be woken up after a certain amount of free space becomes available.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g939da4eeae96f1a57390bcda842cdc7b">snd_seq_open()</a> </dd></dl>
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<a class="anchor" name="g939da4eeae96f1a57390bcda842cdc7b"></a><!-- doxytag: member="seq.h::snd_seq_open" ref="g939da4eeae96f1a57390bcda842cdc7b" args="(snd_seq_t **handle, const char *name, int streams, int mode)" -->
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<td class="memname">int snd_seq_open </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> ** </td>
<td class="paramname"> <em>seqp</em>, </td>
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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">int </td>
<td class="paramname"> <em>streams</em>, </td>
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<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 width="100%"></td>
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<p>
Open the ALSA sequencer.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seqp</em> </td><td>Pointer to a snd_seq_t pointer. This pointer must be kept and passed to most of the other sequencer functions. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>The sequencer's "name". This is <em>not</em> a name you make up for your own purposes; it has special significance to the ALSA library. Usually you need to pass <code>"default"</code> here. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>streams</em> </td><td>The read/write mode of the sequencer. Can be one of three values:<ul>
<li><a class="el" href="group___sequencer.html#g5e81787eb2d1b381307ea72fe1292427">SND_SEQ_OPEN_OUTPUT</a> - open the sequencer for output only</li><li><a class="el" href="group___sequencer.html#gf144e67eb685df9e04cbd9af3c70d127">SND_SEQ_OPEN_INPUT</a> - open the sequencer for input only</li><li><a class="el" href="group___sequencer.html#ga683c3a4aa1dd9e5f403245314b59b0d">SND_SEQ_OPEN_DUPLEX</a> - open the sequencer for output and input </li></ul>
</td></tr>
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</dl>
<dl compact><dt><b>Note:</b></dt><dd>Internally, these are translated to <code>O_WRONLY</code>, <code>O_RDONLY</code> and <code>O_RDWR</code> respectively and used as the second argument to the C library open() call. </dd></dl>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mode</em> </td><td>Optional modifier. Can be either 0, or <a class="el" href="group___sequencer.html#g988e0996a5de89e3ca0bffaf53adb63e">SND_SEQ_NONBLOCK</a>, which will make read/write operations non-blocking. This can also be set later using <a class="el" href="group___sequencer.html#g4e2c3ba1d0db180b78f2e7b920d0b5ee">snd_seq_nonblock()</a>. </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on success otherwise a negative error code</dd></dl>
Creates a new handle and opens a connection to the kernel sequencer interface. After a client is created successfully, an event with <a class="el" href="group___seq_events.html#gg644c72e4af4461703b3fe43a7dfa5cda33d52670268a499b9354397836eeb18f">SND_SEQ_EVENT_CLIENT_START</a> is broadcast to announce port.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gefcca772c2a48ae3e45abc33784628d0">snd_seq_open_lconf()</a>, <a class="el" href="group___sequencer.html#gd9d224abfb59c0b8793506722f01e24b">snd_seq_close()</a>, <a class="el" href="group___sequencer.html#g0025a3ac01ec8466e9cc8b0f1d537c41">snd_seq_type()</a>, <a class="el" href="group___sequencer.html#g3a0dcdb14a02fe16f12141e11cebb959">snd_seq_name()</a>, <a class="el" href="group___sequencer.html#g4e2c3ba1d0db180b78f2e7b920d0b5ee">snd_seq_nonblock()</a>, <a class="el" href="group___sequencer.html#g5175849d1b547a2413ec7cf8431651a0">snd_seq_client_id()</a> </dd></dl>
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<a class="anchor" name="gefcca772c2a48ae3e45abc33784628d0"></a><!-- doxytag: member="seq.h::snd_seq_open_lconf" ref="gefcca772c2a48ae3e45abc33784628d0" args="(snd_seq_t **handle, const char *name, int streams, int mode, snd_config_t *lconf)" -->
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<td class="memname">int snd_seq_open_lconf </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> ** </td>
<td class="paramname"> <em>seqp</em>, </td>
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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">int </td>
<td class="paramname"> <em>streams</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>mode</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___config.html#gb7dc173feea5bedcd999bba678eb53a7">snd_config_t</a> * </td>
<td class="paramname"> <em>lconf</em></td><td> </td>
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<p>
Open the ALSA sequencer using local configuration.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seqp</em> </td><td>Pointer to a snd_seq_t pointer. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>The name to open </td></tr>
<tr><td valign="top"></td><td valign="top"><em>streams</em> </td><td>The read/write mode of the sequencer. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>mode</em> </td><td>Optional modifier </td></tr>
<tr><td valign="top"></td><td valign="top"><em>lconf</em> </td><td>Local configuration </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on success otherwise a negative error code</dd></dl>
See the <a class="el" href="group___sequencer.html#g939da4eeae96f1a57390bcda842cdc7b">snd_seq_open()</a> function for further details. The extension is that the given configuration is used to resolve abstract name.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g939da4eeae96f1a57390bcda842cdc7b">snd_seq_open()</a> </dd></dl>
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</div><p>
<a class="anchor" name="g5086fbf4e38449108a0807fb5cf5e9c6"></a><!-- doxytag: member="seq.h::snd_seq_poll_descriptors" ref="g5086fbf4e38449108a0807fb5cf5e9c6" args="(snd_seq_t *handle, struct pollfd *pfds, unsigned int space, short events)" -->
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<td class="memname">int snd_seq_poll_descriptors </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">struct pollfd * </td>
<td class="paramname"> <em>pfds</em>, </td>
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<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>space</em>, </td>
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<td class="paramtype">short </td>
<td class="paramname"> <em>events</em></td><td> </td>
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<p>
Get poll descriptors.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pfds</em> </td><td>array of poll descriptors </td></tr>
<tr><td valign="top"></td><td valign="top"><em>space</em> </td><td>space in the poll descriptor array </td></tr>
<tr><td valign="top"></td><td valign="top"><em>events</em> </td><td>polling events to be checked (<code>POLLIN</code> and <code>POLLOUT</code>) </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>count of filled descriptors</dd></dl>
Get poll descriptors assigned to the sequencer handle. Since a sequencer handle can duplex streams, you need to set which direction(s) is/are polled in <em>events</em> argument. When <code>POLLIN</code> bit is specified, the incoming events to the ports are checked.<p>
To check the returned poll-events, call <a class="el" href="group___sequencer.html#g2023831b160997c8930d52ed977b64f4">snd_seq_poll_descriptors_revents()</a> instead of reading the pollfd structs directly.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gb7ea9b265ec21ce593ded14071135a3e">snd_seq_poll_descriptors_count()</a>, <a class="el" href="group___sequencer.html#g2023831b160997c8930d52ed977b64f4">snd_seq_poll_descriptors_revents()</a> </dd></dl>
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<a class="anchor" name="gb7ea9b265ec21ce593ded14071135a3e"></a><!-- doxytag: member="seq.h::snd_seq_poll_descriptors_count" ref="gb7ea9b265ec21ce593ded14071135a3e" args="(snd_seq_t *handle, short events)" -->
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<td class="memname">int snd_seq_poll_descriptors_count </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">short </td>
<td class="paramname"> <em>events</em></td><td> </td>
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<td>)</td>
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<p>
Returns the number of poll descriptors.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>events</em> </td><td>the poll events to be checked (<code>POLLIN</code> and <code>POLLOUT</code>) </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>the number of poll descriptors.</dd></dl>
Get the number of poll descriptors. The polling events to be checked can be specified by the second argument. When both input and output are checked, pass <code>POLLIN|POLLOUT</code> <p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g5086fbf4e38449108a0807fb5cf5e9c6">snd_seq_poll_descriptors()</a> </dd></dl>
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<a class="anchor" name="g2023831b160997c8930d52ed977b64f4"></a><!-- doxytag: member="seq.h::snd_seq_poll_descriptors_revents" ref="g2023831b160997c8930d52ed977b64f4" args="(snd_seq_t *seq, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)" -->
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<td class="memname">int snd_seq_poll_descriptors_revents </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">struct pollfd * </td>
<td class="paramname"> <em>pfds</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>nfds</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned short * </td>
<td class="paramname"> <em>revents</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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<p>
get returned events from poll descriptors
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pfds</em> </td><td>array of poll descriptors </td></tr>
<tr><td valign="top"></td><td valign="top"><em>nfds</em> </td><td>count of poll descriptors </td></tr>
<tr><td valign="top"></td><td valign="top"><em>revents</em> </td><td>returned events </td></tr>
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</dl>
<dl compact><dt><b>Returns:</b></dt><dd>zero if success, otherwise a negative error code</dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g5086fbf4e38449108a0807fb5cf5e9c6">snd_seq_poll_descriptors()</a> </dd></dl>
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<a class="anchor" name="gd50134d3bfac0f788ab79b2e9fff9fc9"></a><!-- doxytag: member="seq.h::snd_seq_set_input_buffer_size" ref="gd50134d3bfac0f788ab79b2e9fff9fc9" args="(snd_seq_t *handle, size_t size)" -->
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<td class="memname">int snd_seq_set_input_buffer_size </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>size</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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<p>
Resize the input buffer.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>size</em> </td><td>the size of input buffer to be changed in bytes </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on success otherwise a negative error code</dd></dl>
Changes the size of input buffer.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g1a9f7a6cefe7357deb177dea1dce15b9">snd_seq_get_input_buffer_size()</a> </dd></dl>
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<a class="anchor" name="g12eb62d9dde6b5f4646bb21c68072d76"></a><!-- doxytag: member="seq.h::snd_seq_set_output_buffer_size" ref="g12eb62d9dde6b5f4646bb21c68072d76" args="(snd_seq_t *handle, size_t size)" -->
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<td class="memname">int snd_seq_set_output_buffer_size </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>size</em></td><td> </td>
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<td></td>
<td>)</td>
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<p>
Change the size of output buffer.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>size</em> </td><td>the size of output buffer to be changed in bytes </td></tr>
</table>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on success otherwise a negative error code</dd></dl>
Changes the size of output buffer.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g97db762587222954468250413bf34011">snd_seq_get_output_buffer_size()</a> </dd></dl>
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<a class="anchor" name="gd7e2ff62ed6e402c64cd3982766dc8a6"></a><!-- doxytag: member="seq.h::snd_seq_system_info" ref="gd7e2ff62ed6e402c64cd3982766dc8a6" args="(snd_seq_t *handle, snd_seq_system_info_t *info)" -->
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<td class="memname">int snd_seq_system_info </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
<td class="paramname"> <em>info</em></td><td> </td>
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<p>
obtain the sequencer system information
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>info</em> </td><td>the pointer to be stored </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>0 on success otherwise a negative error code</dd></dl>
Stores the global system information of ALSA sequencer system. The returned data contains the maximum available numbers of queues, clients, ports and channels.
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<a class="anchor" name="g97cf21100bb1242b173fb9a260fd3472"></a><!-- doxytag: member="seq.h::snd_seq_system_info_copy" ref="g97cf21100bb1242b173fb9a260fd3472" args="(snd_seq_system_info_t *dst, const snd_seq_system_info_t *src)" -->
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<td class="memname">void snd_seq_system_info_copy </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
<td class="paramname"> <em>dst</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
<td class="paramname"> <em>src</em></td><td> </td>
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<p>
Copy one <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> to another.
<p>
<dl compact><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>
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<a class="anchor" name="g31a8aa29e2127767261821217c58abef"></a><!-- doxytag: member="seq.h::snd_seq_system_info_free" ref="g31a8aa29e2127767261821217c58abef" args="(snd_seq_system_info_t *ptr)" -->
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<td class="memname">void snd_seq_system_info_free </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
<td class="paramname"> <em>obj</em> </td>
<td> ) </td>
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<p>
Frees a previously allocated <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a>.
<p>
<dl compact><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>
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</dl>
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<a class="anchor" name="gdf43fe5c784dbda03cb1de3116ea5772"></a><!-- doxytag: member="seq.h::snd_seq_system_info_get_channels" ref="gdf43fe5c784dbda03cb1de3116ea5772" args="(const snd_seq_system_info_t *info)" -->
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<td class="memname">int snd_seq_system_info_get_channels </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
<td class="paramname"> <em>info</em> </td>
<td> ) </td>
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<p>
Get maximum number of channels.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>info</em> </td><td><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> container </td></tr>
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</dl>
<dl compact><dt><b>Returns:</b></dt><dd>maximum number of channels</dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gd7e2ff62ed6e402c64cd3982766dc8a6">snd_seq_system_info()</a> </dd></dl>
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<a class="anchor" name="gfa5dfdb2a206838372b8959881328a33"></a><!-- doxytag: member="seq.h::snd_seq_system_info_get_clients" ref="gfa5dfdb2a206838372b8959881328a33" args="(const snd_seq_system_info_t *info)" -->
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<td class="memname">int snd_seq_system_info_get_clients </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
<td class="paramname"> <em>info</em> </td>
<td> ) </td>
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<p>
Get maximum number of clients.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>info</em> </td><td><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> container </td></tr>
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</dl>
<dl compact><dt><b>Returns:</b></dt><dd>maximum number of clients</dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gd7e2ff62ed6e402c64cd3982766dc8a6">snd_seq_system_info()</a> </dd></dl>
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<a class="anchor" name="g6c0ab82ccc452be6846f349cd0aac93b"></a><!-- doxytag: member="seq.h::snd_seq_system_info_get_cur_clients" ref="g6c0ab82ccc452be6846f349cd0aac93b" args="(const snd_seq_system_info_t *info)" -->
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<td class="memname">int snd_seq_system_info_get_cur_clients </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
<td class="paramname"> <em>info</em> </td>
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<p>
Get the current number of clients.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>info</em> </td><td><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> container </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>current number of clients</dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gd7e2ff62ed6e402c64cd3982766dc8a6">snd_seq_system_info()</a> </dd></dl>
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<a class="anchor" name="g9f74f0e0daa9c3056f0cf707795ac5a4"></a><!-- doxytag: member="seq.h::snd_seq_system_info_get_cur_queues" ref="g9f74f0e0daa9c3056f0cf707795ac5a4" args="(const snd_seq_system_info_t *info)" -->
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<td class="memname">int snd_seq_system_info_get_cur_queues </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
<td class="paramname"> <em>info</em> </td>
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<p>
Get the current number of queues.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>info</em> </td><td><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> container </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>current number of queues</dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gd7e2ff62ed6e402c64cd3982766dc8a6">snd_seq_system_info()</a> </dd></dl>
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<a class="anchor" name="g186cf68270ad2bc57b93523bef9531c9"></a><!-- doxytag: member="seq.h::snd_seq_system_info_get_ports" ref="g186cf68270ad2bc57b93523bef9531c9" args="(const snd_seq_system_info_t *info)" -->
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<td class="memname">int snd_seq_system_info_get_ports </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
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<p>
Get maximum number of ports.
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>info</em> </td><td><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> container </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>maximum number of ports</dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gd7e2ff62ed6e402c64cd3982766dc8a6">snd_seq_system_info()</a> </dd></dl>
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<a class="anchor" name="g975201d0785e52b2bb4dac730a2eed47"></a><!-- doxytag: member="seq.h::snd_seq_system_info_get_queues" ref="g975201d0785e52b2bb4dac730a2eed47" args="(const snd_seq_system_info_t *info)" -->
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<td class="memname">int snd_seq_system_info_get_queues </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> * </td>
<td class="paramname"> <em>info</em> </td>
<td> ) </td>
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<p>
Get maximum number of queues.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>info</em> </td><td><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> container </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>maximum number of queues</dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#gd7e2ff62ed6e402c64cd3982766dc8a6">snd_seq_system_info()</a> </dd></dl>
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<a class="anchor" name="gd27466d786fe342a8c5c33bced51017b"></a><!-- doxytag: member="seq.h::snd_seq_system_info_malloc" ref="gd27466d786fe342a8c5c33bced51017b" args="(snd_seq_system_info_t **ptr)" -->
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<td class="memname">int snd_seq_system_info_malloc </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> ** </td>
<td class="paramname"> <em>ptr</em> </td>
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<p>
Allocate an empty <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a> using standard malloc.
<p>
<dl compact><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>
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</dl>
<dl compact><dt><b>Returns:</b></dt><dd>0 on success otherwise negative error code </dd></dl>
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<a class="anchor" name="g7c446cc82d0f437b5a4cd684f0e75856"></a><!-- doxytag: member="seq.h::snd_seq_system_info_sizeof" ref="g7c446cc82d0f437b5a4cd684f0e75856" args="(void)" -->
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<td class="memname">size_t snd_seq_system_info_sizeof </td>
<td>(</td>
<td class="paramtype">void </td>
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<p>
Get size of <a class="el" href="group___sequencer.html#g72d8784184492f962fc74c3a76a1583a">snd_seq_system_info_t</a>.
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<dl compact><dt><b>Returns:</b></dt><dd>size in bytes </dd></dl>
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<a class="anchor" name="g0025a3ac01ec8466e9cc8b0f1d537c41"></a><!-- doxytag: member="seq.h::snd_seq_type" ref="g0025a3ac01ec8466e9cc8b0f1d537c41" args="(snd_seq_t *seq)" -->
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<td class="memname"><a class="el" href="group___sequencer.html#gc0a8306b70ba1821d09beebae876ec3c">snd_seq_type_t</a> snd_seq_type </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___sequencer.html#g527eff2e3b3c7dd45cac6fdd2ceee964">snd_seq_t</a> * </td>
<td class="paramname"> <em>seq</em> </td>
<td> ) </td>
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<p>
get type of sequencer handle
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>seq</em> </td><td>sequencer handle </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>type of sequencer handle</dd></dl>
Returns the type <a class="el" href="group___sequencer.html#gc0a8306b70ba1821d09beebae876ec3c">snd_seq_type_t</a> of the given sequencer handle.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group___sequencer.html#g939da4eeae96f1a57390bcda842cdc7b">snd_seq_open()</a> </dd></dl>
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</div><p>
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