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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
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<meta name="generator" content="Doxygen 1.9.1"/>
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<title>JACK-AUDIO-CONNECTION-KIT: Transport and Timebase control</title>
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<div id="projectname">JACK-AUDIO-CONNECTION-KIT
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<div class="header">
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<a href="#nested-classes">Data Structures</a> |
<a href="#typedef-members">Typedefs</a> |
<a href="#enum-members">Enumerations</a> |
<a href="#enumval-members">Enumerator</a> |
<a href="#func-members">Functions</a> |
<a href="#var-members">Variables</a> </div>
<div class="headertitle">
<div class="title">Transport and Timebase control</div> </div>
</div><!--header-->
<div class="contents">
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structjack__transport__info__t.html">jack_transport_info_t</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a>
Typedefs</h2></td></tr>
<tr class="memitem:ga566f27eba84e0029eb05a631be52b2e5"><td class="memItemLeft" align="right" valign="top">typedef int(* </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga566f27eba84e0029eb05a631be52b2e5">JackSyncCallback</a>) (<a class="el" href="transport_8h.html#a66e50952a88eb087867922bfe3d0bd72">jack_transport_state_t</a> state, <a class="el" href="structjack__position__t.html">jack_position_t</a> *pos, void *arg)</td></tr>
<tr class="separator:ga566f27eba84e0029eb05a631be52b2e5"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga27ed5006f91b931408b11a5b31150af0"><td class="memItemLeft" align="right" valign="top">typedef void(* </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga27ed5006f91b931408b11a5b31150af0">JackTimebaseCallback</a>) (<a class="el" href="transport_8h.html#a66e50952a88eb087867922bfe3d0bd72">jack_transport_state_t</a> state, <a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> nframes, <a class="el" href="structjack__position__t.html">jack_position_t</a> *pos, int new_pos, void *arg)</td></tr>
<tr class="separator:ga27ed5006f91b931408b11a5b31150af0"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a>
Enumerations</h2></td></tr>
<tr class="memitem:ga230191365921fd425c389ed5eab18eef"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga230191365921fd425c389ed5eab18eef">jack_transport_bits_t</a> { <br />
  <a class="el" href="group__TransportControl.html#gga230191365921fd425c389ed5eab18eefa6da5504263d81baf27d53ce2e40e2e9d">JackTransportState</a> = 0x1
, <a class="el" href="group__TransportControl.html#gga230191365921fd425c389ed5eab18eefa16f3fb237dea88a0ff61515efc2e6ec8">JackTransportPosition</a> = 0x2
, <a class="el" href="group__TransportControl.html#gga230191365921fd425c389ed5eab18eefa1757aa4327bc7be2cea3f7d07a570896">JackTransportLoop</a> = 0x4
, <a class="el" href="group__TransportControl.html#gga230191365921fd425c389ed5eab18eefa19f7f95e8c369e9a2bd91f1e7b75d8ec">JackTransportSMPTE</a> = 0x8
, <br />
  <a class="el" href="group__TransportControl.html#gga230191365921fd425c389ed5eab18eefac018587585c9420479978cd49154d02e">JackTransportBBT</a> = 0x10
<br />
}</td></tr>
<tr class="separator:ga230191365921fd425c389ed5eab18eef"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gaea06ff63b129ec6266b2b805b6c8216a"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gaea06ff63b129ec6266b2b805b6c8216a">jack_release_timebase</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:gaea06ff63b129ec6266b2b805b6c8216a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gae53f7ac54804d2896d51b6ad599fa93c"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gae53f7ac54804d2896d51b6ad599fa93c">jack_set_sync_callback</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client, <a class="el" href="group__TransportControl.html#ga566f27eba84e0029eb05a631be52b2e5">JackSyncCallback</a> sync_callback, void *arg) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:gae53f7ac54804d2896d51b6ad599fa93c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga2e89b0bb8702d34bcbbe1eac70685ab2"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga2e89b0bb8702d34bcbbe1eac70685ab2">jack_set_sync_timeout</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client, <a class="el" href="types_8h.html#af9a29b8728e95cc38e2932c0ef855b7e">jack_time_t</a> timeout) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga2e89b0bb8702d34bcbbe1eac70685ab2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga0c2f2f464f6ba1c0b2aa45e6507b7aa9"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga0c2f2f464f6ba1c0b2aa45e6507b7aa9">jack_set_timebase_callback</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client, int conditional, <a class="el" href="group__TransportControl.html#ga27ed5006f91b931408b11a5b31150af0">JackTimebaseCallback</a> timebase_callback, void *arg) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga0c2f2f464f6ba1c0b2aa45e6507b7aa9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab3f52a42084aead87fd1ee75ed25b240"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gab3f52a42084aead87fd1ee75ed25b240">jack_transport_locate</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client, <a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> frame) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:gab3f52a42084aead87fd1ee75ed25b240"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5f08eb71a5ee5431a3d756af5729d5aa"><td class="memItemLeft" align="right" valign="top"><a class="el" href="transport_8h.html#a66e50952a88eb087867922bfe3d0bd72">jack_transport_state_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga5f08eb71a5ee5431a3d756af5729d5aa">jack_transport_query</a> (const <a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client, <a class="el" href="structjack__position__t.html">jack_position_t</a> *pos) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga5f08eb71a5ee5431a3d756af5729d5aa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaef1df9479faa3b7f400c787be173f805"><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__TransportControl.html#gaef1df9479faa3b7f400c787be173f805">jack_get_current_transport_frame</a> (const <a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:gaef1df9479faa3b7f400c787be173f805"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga2f371010358add3cbed8454bd0bd2ef8"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga2f371010358add3cbed8454bd0bd2ef8">jack_transport_reposition</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client, const <a class="el" href="structjack__position__t.html">jack_position_t</a> *pos) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga2f371010358add3cbed8454bd0bd2ef8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab7b158bec8f27c03da29795f142d1caf"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gab7b158bec8f27c03da29795f142d1caf">jack_transport_start</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:gab7b158bec8f27c03da29795f142d1caf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga6be6637c314bd88344826e9bcc1957b0"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga6be6637c314bd88344826e9bcc1957b0">jack_transport_stop</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client) <a class="el" href="weakmacros_8h.html#adf1bde0dd996bbf61a44311165014dd1">JACK_OPTIONAL_WEAK_EXPORT</a></td></tr>
<tr class="separator:ga6be6637c314bd88344826e9bcc1957b0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga994ea49b518181fbdee2adc9be1ee40e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga994ea49b518181fbdee2adc9be1ee40e">jack_get_transport_info</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client, <a class="el" href="structjack__transport__info__t.html">jack_transport_info_t</a> *tinfo) JACK_OPTIONAL_WEAK_DEPRECATED_EXPORT</td></tr>
<tr class="separator:ga994ea49b518181fbdee2adc9be1ee40e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gad27bdf22d5642f2291ba77d7bdb2725a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gad27bdf22d5642f2291ba77d7bdb2725a">jack_set_transport_info</a> (<a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> *client, <a class="el" href="structjack__transport__info__t.html">jack_transport_info_t</a> *tinfo) JACK_OPTIONAL_WEAK_DEPRECATED_EXPORT</td></tr>
<tr class="separator:gad27bdf22d5642f2291ba77d7bdb2725a"><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:gab9dcc731355c88c22554ccd18fdcacc0"><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__TransportControl.html#gab9dcc731355c88c22554ccd18fdcacc0">jack_transport_info_t::frame_rate</a></td></tr>
<tr class="separator:gab9dcc731355c88c22554ccd18fdcacc0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafa8d37eda78c4ce47469157674aaa7e3"><td class="memItemLeft" align="right" valign="top"><a class="el" href="types_8h.html#af9a29b8728e95cc38e2932c0ef855b7e">jack_time_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gafa8d37eda78c4ce47469157674aaa7e3">jack_transport_info_t::usecs</a></td></tr>
<tr class="separator:gafa8d37eda78c4ce47469157674aaa7e3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga69fc58b6d2004fd243186255acc7292e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__TransportControl.html#ga230191365921fd425c389ed5eab18eef">jack_transport_bits_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga69fc58b6d2004fd243186255acc7292e">jack_transport_info_t::valid</a></td></tr>
<tr class="separator:ga69fc58b6d2004fd243186255acc7292e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga748678d245f92f396833cefaca67630c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="transport_8h.html#a66e50952a88eb087867922bfe3d0bd72">jack_transport_state_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga748678d245f92f396833cefaca67630c">jack_transport_info_t::transport_state</a></td></tr>
<tr class="separator:ga748678d245f92f396833cefaca67630c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga7d823f347b9788095d6473dd4ffdf589"><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__TransportControl.html#ga7d823f347b9788095d6473dd4ffdf589">jack_transport_info_t::frame</a></td></tr>
<tr class="separator:ga7d823f347b9788095d6473dd4ffdf589"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga1ae73aca12a5e0404bf02f0aed497f02"><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__TransportControl.html#ga1ae73aca12a5e0404bf02f0aed497f02">jack_transport_info_t::loop_start</a></td></tr>
<tr class="separator:ga1ae73aca12a5e0404bf02f0aed497f02"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga9effad51f43ef06580217c2c92b3f78d"><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__TransportControl.html#ga9effad51f43ef06580217c2c92b3f78d">jack_transport_info_t::loop_end</a></td></tr>
<tr class="separator:ga9effad51f43ef06580217c2c92b3f78d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gad04a7477cc221e0dec25b0e207352a2e"><td class="memItemLeft" align="right" valign="top">long </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gad04a7477cc221e0dec25b0e207352a2e">jack_transport_info_t::smpte_offset</a></td></tr>
<tr class="separator:gad04a7477cc221e0dec25b0e207352a2e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga62b6bea05fdb499ca5945a5a32a64350"><td class="memItemLeft" align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga62b6bea05fdb499ca5945a5a32a64350">jack_transport_info_t::smpte_frame_rate</a></td></tr>
<tr class="separator:ga62b6bea05fdb499ca5945a5a32a64350"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf2a616f6b626180ca1755ace9b47f25f"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gaf2a616f6b626180ca1755ace9b47f25f">jack_transport_info_t::bar</a></td></tr>
<tr class="separator:gaf2a616f6b626180ca1755ace9b47f25f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga3aa1e26090cfefa28315dc3ea2570b84"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga3aa1e26090cfefa28315dc3ea2570b84">jack_transport_info_t::beat</a></td></tr>
<tr class="separator:ga3aa1e26090cfefa28315dc3ea2570b84"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga45efc4128e2405f4f54c8b2340c064cd"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga45efc4128e2405f4f54c8b2340c064cd">jack_transport_info_t::tick</a></td></tr>
<tr class="separator:ga45efc4128e2405f4f54c8b2340c064cd"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga95bc4a23ed5feaf1f21b5655913c3695"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga95bc4a23ed5feaf1f21b5655913c3695">jack_transport_info_t::bar_start_tick</a></td></tr>
<tr class="separator:ga95bc4a23ed5feaf1f21b5655913c3695"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga7129c362cf296e381ffd992bb70c5659"><td class="memItemLeft" align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga7129c362cf296e381ffd992bb70c5659">jack_transport_info_t::beats_per_bar</a></td></tr>
<tr class="separator:ga7129c362cf296e381ffd992bb70c5659"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga3a568f42b2597a1a8fe5c5681b832c2e"><td class="memItemLeft" align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga3a568f42b2597a1a8fe5c5681b832c2e">jack_transport_info_t::beat_type</a></td></tr>
<tr class="separator:ga3a568f42b2597a1a8fe5c5681b832c2e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga4d98a25dc59cf9c7beb203f32b911a51"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga4d98a25dc59cf9c7beb203f32b911a51">jack_transport_info_t::ticks_per_beat</a></td></tr>
<tr class="separator:ga4d98a25dc59cf9c7beb203f32b911a51"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga4505cb67b61179da4a9dd03b7137144e"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga4505cb67b61179da4a9dd03b7137144e">jack_transport_info_t::beats_per_minute</a></td></tr>
<tr class="separator:ga4505cb67b61179da4a9dd03b7137144e"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader">Server-set fields</h2></td></tr>
<tr><td class="ititle" colspan="2"><p><a class="anchor" id="amgrp5738125a58b5f81922b98b6f64d64be8"></a>these cannot be set from clients; the server sets them </p>
</td></tr>
<tr class="memitem:ga2fe4e3ede6d03c170abce08f867f9bc7"><td class="memItemLeft" align="right" valign="top"><a class="el" href="transport_8h.html#af01026c6ef9eb9ef003ed23b6d8ada5f">jack_unique_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga2fe4e3ede6d03c170abce08f867f9bc7">jack_position_t::unique_1</a></td></tr>
<tr class="separator:ga2fe4e3ede6d03c170abce08f867f9bc7"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga08e43943a7153ecff15b0f8ba6517e95"><td class="memItemLeft" align="right" valign="top"><a class="el" href="types_8h.html#af9a29b8728e95cc38e2932c0ef855b7e">jack_time_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga08e43943a7153ecff15b0f8ba6517e95">jack_position_t::usecs</a></td></tr>
<tr class="separator:ga08e43943a7153ecff15b0f8ba6517e95"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gade3f7758360f5ec5432abaead67b553a"><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__TransportControl.html#gade3f7758360f5ec5432abaead67b553a">jack_position_t::frame_rate</a></td></tr>
<tr class="separator:gade3f7758360f5ec5432abaead67b553a"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader">Mandatory fields</h2></td></tr>
<tr class="memitem:gab1d0fe08334f47b1aa8bb36ba722228f"><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__TransportControl.html#gab1d0fe08334f47b1aa8bb36ba722228f">jack_position_t::frame</a></td></tr>
<tr class="separator:gab1d0fe08334f47b1aa8bb36ba722228f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga838c733e8006d1a0cc6921b4a132a8e4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="transport_8h.html#a64608154318de05af9e763bfb5fb8529">jack_position_bits_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga838c733e8006d1a0cc6921b4a132a8e4">jack_position_t::valid</a></td></tr>
<tr class="separator:ga838c733e8006d1a0cc6921b4a132a8e4"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader">JackPositionBBT fields</h2></td></tr>
<tr><td class="ititle" colspan="2"><p><a class="anchor" id="amgrp5010376e6d6e472475b58a395439f385"></a>Bar:Beat.Tick-related information.</p>
<p>Applications that support JackPositionBBT are encouraged to also fill the JackBBTFrameOffset </p>
</td></tr>
<tr class="memitem:ga4f42cef08eb48a97a1b746698697d0de"><td class="memItemLeft" align="right" valign="top">int32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga4f42cef08eb48a97a1b746698697d0de">jack_position_t::bar</a></td></tr>
<tr class="separator:ga4f42cef08eb48a97a1b746698697d0de"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafb3f220fd87757095057abc152289110"><td class="memItemLeft" align="right" valign="top">int32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gafb3f220fd87757095057abc152289110">jack_position_t::beat</a></td></tr>
<tr class="separator:gafb3f220fd87757095057abc152289110"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga9ba36f6c4eaede3bb1c9b7a85b5f76d1"><td class="memItemLeft" align="right" valign="top">int32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga9ba36f6c4eaede3bb1c9b7a85b5f76d1">jack_position_t::tick</a></td></tr>
<tr class="separator:ga9ba36f6c4eaede3bb1c9b7a85b5f76d1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga67ff65ba02ba4146b1e46ce6d51ec644"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga67ff65ba02ba4146b1e46ce6d51ec644">jack_position_t::bar_start_tick</a></td></tr>
<tr class="separator:ga67ff65ba02ba4146b1e46ce6d51ec644"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gadc52988414544ba1b86429dad68c6260"><td class="memItemLeft" align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gadc52988414544ba1b86429dad68c6260">jack_position_t::beats_per_bar</a></td></tr>
<tr class="separator:gadc52988414544ba1b86429dad68c6260"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga15383588a3fb97333204bc564cf1c06c"><td class="memItemLeft" align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga15383588a3fb97333204bc564cf1c06c">jack_position_t::beat_type</a></td></tr>
<tr class="separator:ga15383588a3fb97333204bc564cf1c06c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga08ca4c388c6460dcef82f03346ccbf52"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga08ca4c388c6460dcef82f03346ccbf52">jack_position_t::ticks_per_beat</a></td></tr>
<tr class="separator:ga08ca4c388c6460dcef82f03346ccbf52"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga657486be93ebcb20e3a1b45a91f30d33"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga657486be93ebcb20e3a1b45a91f30d33">jack_position_t::beats_per_minute</a></td></tr>
<tr class="separator:ga657486be93ebcb20e3a1b45a91f30d33"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader">JackPositionTimecode fields <br></h2></td></tr>
<tr><td class="ititle" colspan="2"><p><a class="anchor" id="amgrp5a3642a1adfe1ad44a79f46ba9d16ce3"></a>EXPERIMENTAL: could change </p>
</td></tr>
<tr class="memitem:gabd97b0d447281eebffa750c2b90e791d"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gabd97b0d447281eebffa750c2b90e791d">jack_position_t::frame_time</a></td></tr>
<tr class="separator:gabd97b0d447281eebffa750c2b90e791d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga83e65f9658fa4d93658cbad47d446b0b"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga83e65f9658fa4d93658cbad47d446b0b">jack_position_t::next_time</a></td></tr>
<tr class="separator:ga83e65f9658fa4d93658cbad47d446b0b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gae4bb9383734d2e7ca7758011102c03b2"><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__TransportControl.html#gae4bb9383734d2e7ca7758011102c03b2">jack_position_t::bbt_offset</a></td></tr>
<tr class="separator:gae4bb9383734d2e7ca7758011102c03b2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf28a3e9ee8b36a92309de372093f56f3"><td class="memItemLeft" align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gaf28a3e9ee8b36a92309de372093f56f3">jack_position_t::audio_frames_per_video_frame</a></td></tr>
<tr class="separator:gaf28a3e9ee8b36a92309de372093f56f3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gac03889456c88714ddf680784ee970d3b"><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__TransportControl.html#gac03889456c88714ddf680784ee970d3b">jack_position_t::video_offset</a></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader">JACK Extra transport fields</h2></td></tr>
<tr class="memitem:gabf43d666f71ba6a9dd7f81c68affce99"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#gabf43d666f71ba6a9dd7f81c68affce99">jack_position_t::tick_double</a></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader">Other fields</h2></td></tr>
<tr class="memitem:ga13b42068f5024ec6c29686de66647a73"><td class="memItemLeft" align="right" valign="top">int32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga13b42068f5024ec6c29686de66647a73">jack_position_t::padding</a> [5]</td></tr>
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<tr class="memitem:ga9c3d31034160d5d2b9205eae9983e385"><td class="memItemLeft" align="right" valign="top"><a class="el" href="transport_8h.html#af01026c6ef9eb9ef003ed23b6d8ada5f">jack_unique_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__TransportControl.html#ga9c3d31034160d5d2b9205eae9983e385">jack_position_t::unique_2</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Typedef Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga566f27eba84e0029eb05a631be52b2e5">◆ </a></span>JackSyncCallback</h2>
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<td class="memname">typedef int(* JackSyncCallback) (<a class="el" href="transport_8h.html#a66e50952a88eb087867922bfe3d0bd72">jack_transport_state_t</a> state, <a class="el" href="structjack__position__t.html">jack_position_t</a> *pos, void *arg)</td>
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<p>Prototype for the <em>sync_callback</em> defined by <a class="el" href="transport-design.html#slowsyncclients">slow-sync clients</a>. When the client is active, this callback is invoked just before process() in the same thread. This occurs once after registration, then subsequently whenever some client requests a new position, or the transport enters the <a class="el" href="group__TransportControl.html#ga66e50952a88eb087867922bfe3d0bd72a8c1e22fce8ef6c18baf7a5c6a69060ac">JackTransportStarting</a> state. This realtime function must not wait.</p>
<p>The transport <em>state</em> will be:</p>
<ul>
<li><a class="el" href="group__TransportControl.html#ga66e50952a88eb087867922bfe3d0bd72a30087dc754e67549d91e78a4242393f0">JackTransportStopped</a> when a new position is requested;</li>
<li><a class="el" href="group__TransportControl.html#ga66e50952a88eb087867922bfe3d0bd72a8c1e22fce8ef6c18baf7a5c6a69060ac">JackTransportStarting</a> when the transport is waiting to start;</li>
<li><a class="el" href="group__TransportControl.html#ga66e50952a88eb087867922bfe3d0bd72a4077d7d6fe566f3f0441755a588ad1b2">JackTransportRolling</a> when the timeout has expired, and the position is now a moving target.</li>
</ul>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">state</td><td>current transport state. </td></tr>
<tr><td class="paramname">pos</td><td>new transport position. </td></tr>
<tr><td class="paramname">arg</td><td>the argument supplied by <a class="el" href="group__TransportControl.html#gae53f7ac54804d2896d51b6ad599fa93c">jack_set_sync_callback()</a>.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>TRUE (non-zero) when ready to roll. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga27ed5006f91b931408b11a5b31150af0">◆ </a></span>JackTimebaseCallback</h2>
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<td class="memname">typedef void(* JackTimebaseCallback) (<a class="el" href="transport_8h.html#a66e50952a88eb087867922bfe3d0bd72">jack_transport_state_t</a> state, <a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> nframes, <a class="el" href="structjack__position__t.html">jack_position_t</a> *pos, int new_pos, void *arg)</td>
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<p>Prototype for the <em>timebase_callback</em> used to provide extended position information. Its output affects all of the following process cycle. This realtime function must not wait.</p>
<p>This function is called immediately after process() in the same thread whenever the transport is rolling, or when any client has requested a new position in the previous cycle. The first cycle after <a class="el" href="group__TransportControl.html#ga0c2f2f464f6ba1c0b2aa45e6507b7aa9">jack_set_timebase_callback()</a> is also treated as a new position, or the first cycle after <a class="el" href="group__ClientFunctions.html#ga9800d5b29bd7670d9944a15f6ea0ecf8">jack_activate()</a> if the client had been inactive.</p>
<p>The timebase master may not use its <em>pos</em> argument to set <em>pos->frame</em>. To change position, use <a class="el" href="group__TransportControl.html#ga2f371010358add3cbed8454bd0bd2ef8">jack_transport_reposition()</a> or <a class="el" href="group__TransportControl.html#gab3f52a42084aead87fd1ee75ed25b240">jack_transport_locate()</a>. These functions are realtime-safe, the <em>timebase_callback</em> can call them directly.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">state</td><td>current transport state. </td></tr>
<tr><td class="paramname">nframes</td><td>number of frames in current period. </td></tr>
<tr><td class="paramname">pos</td><td>address of the position structure for the next cycle; <em>pos->frame</em> will be its frame number. If <em>new_pos</em> is FALSE, this structure contains extended position information from the current cycle. If TRUE, it contains whatever was set by the requester. The <em>timebase_callback's</em> task is to update the extended information here. </td></tr>
<tr><td class="paramname">new_pos</td><td>TRUE (non-zero) for a newly requested <em>pos</em>, or for the first cycle after the <em>timebase_callback</em> is defined. </td></tr>
<tr><td class="paramname">arg</td><td>the argument supplied by <a class="el" href="group__TransportControl.html#ga0c2f2f464f6ba1c0b2aa45e6507b7aa9">jack_set_timebase_callback()</a>. </td></tr>
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<h2 class="groupheader">Enumeration Type Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga230191365921fd425c389ed5eab18eef">◆ </a></span>jack_transport_bits_t</h2>
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<td class="memname">enum <a class="el" href="group__TransportControl.html#ga230191365921fd425c389ed5eab18eef">jack_transport_bits_t</a></td>
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<p>Optional struct <a class="el" href="structjack__transport__info__t.html">jack_transport_info_t</a> fields.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="transport_8h.html#a64608154318de05af9e763bfb5fb8529">jack_position_bits_t</a>. </dd></dl>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="gga230191365921fd425c389ed5eab18eefa6da5504263d81baf27d53ce2e40e2e9d"></a>JackTransportState </td><td class="fielddoc"><p>Transport state </p>
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<tr><td class="fieldname"><a id="gga230191365921fd425c389ed5eab18eefa16f3fb237dea88a0ff61515efc2e6ec8"></a>JackTransportPosition </td><td class="fielddoc"><p>Frame number </p>
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<tr><td class="fieldname"><a id="gga230191365921fd425c389ed5eab18eefa1757aa4327bc7be2cea3f7d07a570896"></a>JackTransportLoop </td><td class="fielddoc"><p>Loop boundaries (ignored) </p>
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<tr><td class="fieldname"><a id="gga230191365921fd425c389ed5eab18eefa19f7f95e8c369e9a2bd91f1e7b75d8ec"></a>JackTransportSMPTE </td><td class="fielddoc"><p>SMPTE (ignored) </p>
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<tr><td class="fieldname"><a id="gga230191365921fd425c389ed5eab18eefac018587585c9420479978cd49154d02e"></a>JackTransportBBT </td><td class="fielddoc"><p>Bar, Beat, Tick </p>
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<h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#gaef1df9479faa3b7f400c787be173f805">◆ </a></span>jack_get_current_transport_frame()</h2>
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<td class="memname"><a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> jack_get_current_transport_frame </td>
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<td class="paramtype">const <a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
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<p>Return an estimate of the current transport frame, including any time elapsed since the last transport positional update.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">client</td><td>the JACK client structure </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#ga994ea49b518181fbdee2adc9be1ee40e">◆ </a></span>jack_get_transport_info()</h2>
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<td class="memname">void jack_get_transport_info </td>
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<td class="paramtype"><a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
<td class="paramname"><em>client</em>, </td>
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<td class="paramtype"><a class="el" href="structjack__transport__info__t.html">jack_transport_info_t</a> * </td>
<td class="paramname"><em>tinfo</em> </td>
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<p>Gets the current transport info structure (deprecated).</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">client</td><td>the JACK client structure. </td></tr>
<tr><td class="paramname">tinfo</td><td>current transport info structure. The "valid" field describes which fields contain valid data.</td></tr>
</table>
</dd>
</dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000018">Deprecated:</a></b></dt><dd>This is for compatibility with the earlier transport interface. Use <a class="el" href="group__TransportControl.html#ga5f08eb71a5ee5431a3d756af5729d5aa">jack_transport_query()</a>, instead.</dd></dl>
<dl class="section pre"><dt>Precondition</dt><dd>Must be called from the process thread. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaea06ff63b129ec6266b2b805b6c8216a">◆ </a></span>jack_release_timebase()</h2>
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<td class="memname">int jack_release_timebase </td>
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<td class="paramtype"><a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
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<p>Called by the timebase master to release itself from that responsibility.</p>
<p>If the timebase master releases the timebase or leaves the JACK graph for any reason, the JACK engine takes over at the start of the next process cycle. The transport state does not change. If rolling, it continues to play, with frame numbers as the only available position information.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__TransportControl.html#ga0c2f2f464f6ba1c0b2aa45e6507b7aa9">jack_set_timebase_callback</a></dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">client</td><td>the JACK client structure.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>0 on success, otherwise a non-zero error code. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gae53f7ac54804d2896d51b6ad599fa93c">◆ </a></span>jack_set_sync_callback()</h2>
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<td class="memname">int jack_set_sync_callback </td>
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<td class="paramtype"><a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
<td class="paramname"><em>client</em>, </td>
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<td class="paramtype"><a class="el" href="group__TransportControl.html#ga566f27eba84e0029eb05a631be52b2e5">JackSyncCallback</a> </td>
<td class="paramname"><em>sync_callback</em>, </td>
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<p>Register (or unregister) as a <a class="el" href="transport-design.html#slowsyncclients">slow-sync client</a>, that cannot respond immediately to transport position changes.</p>
<p>The <em>sync_callback</em> will be invoked at the first available opportunity after its registration is complete. If the client is currently active this will be the following process cycle, otherwise it will be the first cycle after calling <a class="el" href="group__ClientFunctions.html#ga9800d5b29bd7670d9944a15f6ea0ecf8">jack_activate()</a>. After that, it runs according to the <a class="el" href="group__TransportControl.html#ga566f27eba84e0029eb05a631be52b2e5">JackSyncCallback</a> rules. Clients that don't set a <em>sync_callback</em> are assumed to be ready immediately any time the transport wants to start.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">client</td><td>the JACK client structure. </td></tr>
<tr><td class="paramname">sync_callback</td><td>is a realtime function that returns TRUE when the client is ready. Setting <em>sync_callback</em> to NULL declares that this client no longer requires slow-sync processing. </td></tr>
<tr><td class="paramname">arg</td><td>an argument for the <em>sync_callback</em> function.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>0 on success, otherwise a non-zero error code. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga2e89b0bb8702d34bcbbe1eac70685ab2">◆ </a></span>jack_set_sync_timeout()</h2>
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<td class="memname">int jack_set_sync_timeout </td>
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<td class="paramtype"><a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
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<td class="paramtype"><a class="el" href="types_8h.html#af9a29b8728e95cc38e2932c0ef855b7e">jack_time_t</a> </td>
<td class="paramname"><em>timeout</em> </td>
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<p>Set the timeout value for <a class="el" href="transport-design.html#slowsyncclients">slow-sync clients</a>.</p>
<p>This timeout prevents unresponsive slow-sync clients from completely halting the transport mechanism. The default is two seconds. When the timeout expires, the transport starts rolling, even if some slow-sync clients are still unready. The <em>sync_callbacks</em> of these clients continue being invoked, giving them a chance to catch up.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__TransportControl.html#gae53f7ac54804d2896d51b6ad599fa93c">jack_set_sync_callback</a></dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">client</td><td>the JACK client structure. </td></tr>
<tr><td class="paramname">timeout</td><td>is delay (in microseconds) before the timeout expires.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>0 on success, otherwise a non-zero error code. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0c2f2f464f6ba1c0b2aa45e6507b7aa9">◆ </a></span>jack_set_timebase_callback()</h2>
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<td class="memname">int jack_set_timebase_callback </td>
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<td class="paramtype"><a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
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<td class="paramtype"><a class="el" href="group__TransportControl.html#ga27ed5006f91b931408b11a5b31150af0">JackTimebaseCallback</a> </td>
<td class="paramname"><em>timebase_callback</em>, </td>
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<td class="paramtype">void * </td>
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<p>Register as timebase master for the JACK subsystem.</p>
<p>The timebase master registers a callback that updates extended position information such as beats or timecode whenever necessary. Without this extended information, there is no need for this function.</p>
<p>There is never more than one master at a time. When a new client takes over, the former <em>timebase_callback</em> is no longer called. Taking over the timebase may be done conditionally, so it fails if there was a master already.</p>
<p>The method may be called whether the client has been activated or not.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">client</td><td>the JACK client structure. </td></tr>
<tr><td class="paramname">conditional</td><td>non-zero for a conditional request. </td></tr>
<tr><td class="paramname">timebase_callback</td><td>is a realtime function that returns position information. </td></tr>
<tr><td class="paramname">arg</td><td>an argument for the <em>timebase_callback</em> function.</td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd><ul>
<li>0 on success;</li>
<li>EBUSY if a conditional request fails because there was already a timebase master;</li>
<li>other non-zero error code. </li>
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</dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gad27bdf22d5642f2291ba77d7bdb2725a">◆ </a></span>jack_set_transport_info()</h2>
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<td class="memname">void jack_set_transport_info </td>
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<td class="paramtype"><a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
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<td class="paramtype"><a class="el" href="structjack__transport__info__t.html">jack_transport_info_t</a> * </td>
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<p>Set the transport info structure (deprecated).</p>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000019">Deprecated:</a></b></dt><dd>This function still exists for compatibility with the earlier transport interface, but it does nothing. Instead, define a <a class="el" href="group__TransportControl.html#ga27ed5006f91b931408b11a5b31150af0">JackTimebaseCallback</a>. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gab3f52a42084aead87fd1ee75ed25b240">◆ </a></span>jack_transport_locate()</h2>
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<td class="memname">int jack_transport_locate </td>
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<td class="paramtype"><a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
<td class="paramname"><em>client</em>, </td>
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<td class="paramname"><em>frame</em> </td>
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<p>Reposition the transport to a new frame number.</p>
<p>May be called at any time by any client. The new position takes effect in two process cycles. If there are <a class="el" href="transport-design.html#slowsyncclients">slow-sync clients</a> and the transport is already rolling, it will enter the <a class="el" href="group__TransportControl.html#ga66e50952a88eb087867922bfe3d0bd72a8c1e22fce8ef6c18baf7a5c6a69060ac">JackTransportStarting</a> state and begin invoking their <em>sync_callbacks</em> until ready. This function is realtime-safe.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__TransportControl.html#ga2f371010358add3cbed8454bd0bd2ef8">jack_transport_reposition</a>, <a class="el" href="group__TransportControl.html#gae53f7ac54804d2896d51b6ad599fa93c">jack_set_sync_callback</a></dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">client</td><td>the JACK client structure. </td></tr>
<tr><td class="paramname">frame</td><td>frame number of new transport position.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>0 if valid request, non-zero otherwise. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga5f08eb71a5ee5431a3d756af5729d5aa">◆ </a></span>jack_transport_query()</h2>
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<td class="memname"><a class="el" href="transport_8h.html#a66e50952a88eb087867922bfe3d0bd72">jack_transport_state_t</a> jack_transport_query </td>
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<td class="paramtype">const <a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
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<td class="paramtype"><a class="el" href="structjack__position__t.html">jack_position_t</a> * </td>
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<p>Query the current transport state and position.</p>
<p>This function is realtime-safe, and can be called from any thread. If called from the process thread, <em>pos</em> corresponds to the first frame of the current cycle and the state returned is valid for the entire cycle.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">client</td><td>the JACK client structure. </td></tr>
<tr><td class="paramname">pos</td><td>pointer to structure for returning current transport position; <em>pos->valid</em> will show which fields contain valid data. If <em>pos</em> is NULL, do not return position information.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Current transport state. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga2f371010358add3cbed8454bd0bd2ef8">◆ </a></span>jack_transport_reposition()</h2>
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<td class="memname">int jack_transport_reposition </td>
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<td class="paramtype"><a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
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<p>Request a new transport position.</p>
<p>May be called at any time by any client. The new position takes effect in two process cycles. If there are <a class="el" href="transport-design.html#slowsyncclients">slow-sync clients</a> and the transport is already rolling, it will enter the <a class="el" href="group__TransportControl.html#ga66e50952a88eb087867922bfe3d0bd72a8c1e22fce8ef6c18baf7a5c6a69060ac">JackTransportStarting</a> state and begin invoking their <em>sync_callbacks</em> until ready. This function is realtime-safe.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__TransportControl.html#gab3f52a42084aead87fd1ee75ed25b240">jack_transport_locate</a>, <a class="el" href="group__TransportControl.html#gae53f7ac54804d2896d51b6ad599fa93c">jack_set_sync_callback</a></dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">client</td><td>the JACK client structure. </td></tr>
<tr><td class="paramname">pos</td><td>requested new transport position. Fill pos->valid to specify which fields should be taken into account. If you mark a set of fields as valid, you are expected to fill them all.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>0 if valid request, EINVAL if position structure rejected. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gab7b158bec8f27c03da29795f142d1caf">◆ </a></span>jack_transport_start()</h2>
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<td class="memname">void jack_transport_start </td>
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<p>Start the JACK transport rolling.</p>
<p>Any client can make this request at any time. It takes effect no sooner than the next process cycle, perhaps later if there are <a class="el" href="transport-design.html#slowsyncclients">slow-sync clients</a>. This function is realtime-safe.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__TransportControl.html#gae53f7ac54804d2896d51b6ad599fa93c">jack_set_sync_callback</a></dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">client</td><td>the JACK client structure. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#ga6be6637c314bd88344826e9bcc1957b0">◆ </a></span>jack_transport_stop()</h2>
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<td class="memname">void jack_transport_stop </td>
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<td class="paramtype"><a class="el" href="types_8h.html#a96cf103940d2ee71b141d4b9d0c116bf">jack_client_t</a> * </td>
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<p>Stop the JACK transport.</p>
<p>Any client can make this request at any time. It takes effect on the next process cycle. This function is realtime-safe.</p>
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<tr><td class="paramname">client</td><td>the JACK client structure. </td></tr>
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<h2 class="groupheader">Variable Documentation</h2>
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<p>number of audio frames per video frame. Should be assumed zero if JackAudioVideoRatio is not set. If JackAudioVideoRatio is set and the value is zero, no video data exists within the JACK graph </p>
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<p>current bar</p>
<p>Should be >0: the first bar is bar '1'. </p>
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<p>number of ticks that have elapsed between frame 0 and the first beat of the current measure. </p>
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<td class="memname"><a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> jack_position_t::bbt_offset</td>
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<p>frame offset for the BBT fields (the given bar, beat, and tick values actually refer to a time frame_offset frames before the start of the cycle), should be assumed to be 0 if JackBBTFrameOffset is not set. If JackBBTFrameOffset is set and this value is zero, the BBT time refers to the first frame of this cycle. If the value is positive, the BBT time refers to a frame that many frames before the start of the cycle. </p>
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<p>current beat-within-bar</p>
<p>Should be >0 and <=beats_per_bar: the first beat is beat '1'. </p>
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<p>time signature "denominator" </p>
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<p>time signature "numerator" </p>
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<p>BPM, quantized to block size. This means when the tempo is not constant within this block, the BPM value should adapted to compensate for this. This is different from most fields in this struct, which specify the value at the beginning of the block rather than an average. </p>
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<td class="memname"><a class="el" href="types_8h.html#aa954df532e901ae5172e68a23f3da9b6">jack_nframes_t</a> jack_position_t::frame</td>
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<p>frame number, always present/required.</p>
<p>This is the frame number on the transport timeline, which is not the same as what <a class="el" href="group__TimeFunctions.html#ga45cec2e76db58e72b46339229de64697">jack_frame_time</a> returns. </p>
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