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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<div class="header">
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<a href="#func-members">Functions</a> |
<a href="#var-members">Variables</a> </div>
<div class="headertitle">
<div class="title">Reading and writing MIDI data</div> </div>
</div><!--header-->
<div class="contents">
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga0a87111085b94460401b0b688595a138"><td class="memItemLeft" align="right" valign="top"><a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#ga0a87111085b94460401b0b688595a138">jack_midi_get_event_count</a> (void *port_buffer) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga0a87111085b94460401b0b688595a138"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga838c794bd1451bfd47edde1c7cd1ff4f"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#ga838c794bd1451bfd47edde1c7cd1ff4f">jack_midi_event_get</a> (<a class="el" href="midiport_8h.html#ae34bec0cd504eee54afffda51122a352">jack_midi_event_t</a> *event, void *port_buffer, uint32_t event_index) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga838c794bd1451bfd47edde1c7cd1ff4f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga7635c6e0a4eb2314a5fb5a058c278078"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#ga7635c6e0a4eb2314a5fb5a058c278078">jack_midi_clear_buffer</a> (void *port_buffer) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga7635c6e0a4eb2314a5fb5a058c278078"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab69743a191f150757fa3708eae8fdb81"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#gab69743a191f150757fa3708eae8fdb81">jack_midi_max_event_size</a> (void *port_buffer) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:gab69743a191f150757fa3708eae8fdb81"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga150dcdc37583e1ecbe0a6f16b6ac48a9"><td class="memItemLeft" align="right" valign="top"><a class="el" href="midiport_8h.html#ad1df9c73b07584ffb69c276421ff55c9">jack_midi_data_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#ga150dcdc37583e1ecbe0a6f16b6ac48a9">jack_midi_event_reserve</a> (void *port_buffer, <a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> time, size_t data_size) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga150dcdc37583e1ecbe0a6f16b6ac48a9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaa25503c07ac3c2ed62d79be9c25d42ed"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#gaa25503c07ac3c2ed62d79be9c25d42ed">jack_midi_event_write</a> (void *port_buffer, <a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> time, const <a class="el" href="midiport_8h.html#ad1df9c73b07584ffb69c276421ff55c9">jack_midi_data_t</a> *data, size_t data_size) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:gaa25503c07ac3c2ed62d79be9c25d42ed"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga0f5af3d054e218a5b90fd4c636425e45"><td class="memItemLeft" align="right" valign="top">uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#ga0f5af3d054e218a5b90fd4c636425e45">jack_midi_get_lost_event_count</a> (void *port_buffer) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga0f5af3d054e218a5b90fd4c636425e45"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a>
Variables</h2></td></tr>
<tr class="memitem:ga7acc6a81ac12e2a042d5af9fb7b56532"><td class="memItemLeft" align="right" valign="top"><a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#ga7acc6a81ac12e2a042d5af9fb7b56532">_jack_midi_event::time</a></td></tr>
<tr class="separator:ga7acc6a81ac12e2a042d5af9fb7b56532"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gabc254ee669d342c75ccfa49658b54a56"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#gabc254ee669d342c75ccfa49658b54a56">_jack_midi_event::size</a></td></tr>
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<tr class="memitem:gadebcb1577b20165e4da170f8992bc0ba"><td class="memItemLeft" align="right" valign="top"><a class="el" href="midiport_8h.html#ad1df9c73b07584ffb69c276421ff55c9">jack_midi_data_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__MIDIAPI.html#gadebcb1577b20165e4da170f8992bc0ba">_jack_midi_event::buffer</a></td></tr>
<tr class="separator:gadebcb1577b20165e4da170f8992bc0ba"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga7635c6e0a4eb2314a5fb5a058c278078"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga7635c6e0a4eb2314a5fb5a058c278078">◆ </a></span>jack_midi_clear_buffer()</h2>
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<td class="memname">void jack_midi_clear_buffer </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"><em>port_buffer</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Clear an event buffer.</p>
<p>This should be called at the beginning of each process cycle before calling <a class="el" href="group__MIDIAPI.html#ga150dcdc37583e1ecbe0a6f16b6ac48a9">jack_midi_event_reserve</a> or <a class="el" href="group__MIDIAPI.html#gaa25503c07ac3c2ed62d79be9c25d42ed">jack_midi_event_write</a>. This function may not be called on an input port's buffer.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">port_buffer</td><td>Port buffer to clear (must be an output port buffer). </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga838c794bd1451bfd47edde1c7cd1ff4f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga838c794bd1451bfd47edde1c7cd1ff4f">◆ </a></span>jack_midi_event_get()</h2>
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<td class="memname">int jack_midi_event_get </td>
<td>(</td>
<td class="paramtype"><a class="el" href="midiport_8h.html#ae34bec0cd504eee54afffda51122a352">jack_midi_event_t</a> * </td>
<td class="paramname"><em>event</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>port_buffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>event_index</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Get a MIDI event from an event port buffer.</p>
<p>Jack MIDI is normalised, the MIDI event returned by this function is guaranteed to be a complete MIDI event (the status byte will always be present, and no realtime events will interspered with the event).</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">event</td><td>Event structure to store retrieved event in. </td></tr>
<tr><td class="paramname">port_buffer</td><td>Port buffer from which to retrieve event. </td></tr>
<tr><td class="paramname">event_index</td><td>Index of event to retrieve. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success, ENODATA if buffer is empty. </dd></dl>
</div>
</div>
<a id="ga150dcdc37583e1ecbe0a6f16b6ac48a9"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga150dcdc37583e1ecbe0a6f16b6ac48a9">◆ </a></span>jack_midi_event_reserve()</h2>
<div class="memitem">
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<table class="memname">
<tr>
<td class="memname"><a class="el" href="midiport_8h.html#ad1df9c73b07584ffb69c276421ff55c9">jack_midi_data_t</a>* jack_midi_event_reserve </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"><em>port_buffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> </td>
<td class="paramname"><em>time</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>data_size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Allocate space for an event to be written to an event port buffer.</p>
<p>Clients are to write the actual event data to be written starting at the pointer returned by this function. Clients must not write more than <em>data_size</em> bytes into this buffer. Clients must write normalised MIDI data to the port - no running status and no (1-byte) realtime messages interspersed with other messages (realtime messages are fine when they occur on their own, like other messages).</p>
<p>Events must be written in order, sorted by their sample offsets. JACK will not sort the events for you, and will refuse to store out-of-order events.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">port_buffer</td><td>Buffer to write event to. </td></tr>
<tr><td class="paramname">time</td><td>Sample offset of event. </td></tr>
<tr><td class="paramname">data_size</td><td>Length of event's raw data in bytes. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Pointer to the beginning of the reserved event's data buffer, or NULL on error (ie not enough space). </dd></dl>
</div>
</div>
<a id="gaa25503c07ac3c2ed62d79be9c25d42ed"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaa25503c07ac3c2ed62d79be9c25d42ed">◆ </a></span>jack_midi_event_write()</h2>
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<td class="memname">int jack_midi_event_write </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"><em>port_buffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> </td>
<td class="paramname"><em>time</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="midiport_8h.html#ad1df9c73b07584ffb69c276421ff55c9">jack_midi_data_t</a> * </td>
<td class="paramname"><em>data</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>data_size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Write an event into an event port buffer.</p>
<p>This function is simply a wrapper for <a class="el" href="group__MIDIAPI.html#ga150dcdc37583e1ecbe0a6f16b6ac48a9">jack_midi_event_reserve</a> which writes the event data into the space reserved in the buffer.</p>
<p>Clients must not write more than <em>data_size</em> bytes into this buffer. Clients must write normalised MIDI data to the port - no running status and no (1-byte) realtime messages interspersed with other messages (realtime messages are fine when they occur on their own, like other messages).</p>
<p>Events must be written in order, sorted by their sample offsets. JACK will not sort the events for you, and will refuse to store out-of-order events.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">port_buffer</td><td>Buffer to write event to. </td></tr>
<tr><td class="paramname">time</td><td>Sample offset of event. </td></tr>
<tr><td class="paramname">data</td><td>Message data to be written. </td></tr>
<tr><td class="paramname">data_size</td><td>Length of <em>data</em> in bytes. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success, ENOBUFS if there's not enough space in buffer for event. </dd></dl>
</div>
</div>
<a id="ga0a87111085b94460401b0b688595a138"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga0a87111085b94460401b0b688595a138">◆ </a></span>jack_midi_get_event_count()</h2>
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<td class="memname"><a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> jack_midi_get_event_count </td>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0f5af3d054e218a5b90fd4c636425e45">◆ </a></span>jack_midi_get_lost_event_count()</h2>
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<td class="memname">uint32_t jack_midi_get_lost_event_count </td>
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<p>Get the number of events that could not be written to <em>port_buffer</em>.</p>
<p>This function returning a non-zero value implies <em>port_buffer</em> is full. Currently the only way this can happen is if events are lost on port mixdown.</p>
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<tr><td class="paramname">port_buffer</td><td>Port to receive count for. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Number of events that could not be written to <em>port_buffer</em>. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gab69743a191f150757fa3708eae8fdb81">◆ </a></span>jack_midi_max_event_size()</h2>
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<td class="memname">size_t jack_midi_max_event_size </td>
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<p>Get the size of the largest event that can be stored by the port.</p>
<p>This function returns the current space available, taking into account events already stored in the port.</p>
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<h2 class="groupheader">Variable Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#gadebcb1577b20165e4da170f8992bc0ba">◆ </a></span>buffer</h2>
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<td class="memname"><a class="el" href="midiport_8h.html#ad1df9c73b07584ffb69c276421ff55c9">jack_midi_data_t</a>* _jack_midi_event::buffer</td>
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<p>Raw MIDI data </p>
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<h2 class="memtitle"><span class="permalink"><a href="#gabc254ee669d342c75ccfa49658b54a56">◆ </a></span>size</h2>
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<td class="memname">size_t _jack_midi_event::size</td>
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<p>Number of bytes of data in <em>buffer</em> </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga7acc6a81ac12e2a042d5af9fb7b56532">◆ </a></span>time</h2>
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<td class="memname"><a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> _jack_midi_event::time</td>
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<p>Sample index at which event is valid </p>
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