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jackdbus.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="generator" content="AsciiDoc 10.2.0">
<title>(LADI) jackdbus</title>
<style type="text/css">
/*
* AsciiDoc 'ladi' theme, based on 'volnitsky' theme for xhtml11 and html5 backends.
* Based on css from http://volnitsky.com, which was in turn based on default
* theme from AsciiDoc
*
* FIXME: The styling is still a bit rough in places.
*
*/
/* Default font. */
body {
font-family: Georgia,"Times New Roman",Times,serif;
font-size: 16pt;
}
/* Title font. */
h1, h2, h3, h4, h5, h6,
div.title, caption.title,
thead, p.table.header,
#toctitle,
#author, #revnumber, #revdate, #revremark,
#footer {
font-family: Candara,Arial,sans-serif;
}
a.image { border-bottom: 0; }
#toc a {
border-bottom: 1px dotted #999999;
color: #3A3A4D !important;
text-decoration: none !important;
}
#toc a:hover {
border-bottom: 1px solid #6D4100;
color: #6D4100 !important;
text-decoration: none !important;
}
a { color: #666688; text-decoration: none; border-bottom: 1px dotted #666688; }
a:visited { color: #615FA0; border-bottom: 1px dotted #615FA0; }
a:hover { color: #6D4100; border-bottom: 1px solid #6D4100; }
em {
font-style: italic;
color: #444466;
}
strong {
font-weight: bold;
color: #444466;
}
h1, h2, h3, h4, h5, h6 {
color: #666688;
margin-bottom: 0.5em;
margin-right: 1em;
line-height: 1.3;
letter-spacing:+0.15em;
}
h1, h2, h3, h4, h5, h6 {
margin-left: 0em;
}
/* h1 { margin-left: 2em; } */
h2 { margin-left: 2em; }
/* h3 { margin-left: 4em; } */
/* h4 { margin-left: 5em; } */
/* h5 { margin-left: 6em; } */
/* h6 { margin-left: 7em; } */
h2 { border-bottom: 4px solid #ccd; }
h3 { border-bottom: 2px dotted #ccd; }
/* h2, h3 { border-bottom: 2px solid #ccd; } */
/* h2 { padding-top: 0.5em; } */
/* h3 { float: left; } */
/* h3 + * { clear: left; } */
div.banner {
background: #004455;
text-align: center;
color: #C6E9AF;
padding: 0;
margin: 0;
}
div.sectionbody {
margin-top: 0;
margin-left: 3em;
margin-right: 1em;
margin-bottom: 1em;
}
hr {
border: 1px solid #444466;
}
p {
margin-left: 0.5em;
margin-right: 0.5em;
margin-top: 0.5em;
margin-bottom: 0.5em;
}
ul, ol, li > p {
margin-top: 0;
}
pre {
padding: 0;
margin: 0;
}
#author {
color: #444466;
font-weight: bold;
font-size: 1.1em;
}
#footer {
font-size: small;
border-top: 2px solid silver;
margin: 0;
}
#footer-text {
/* float: left; */
padding: 1em;
text-align: center;
}
#footer-badges {
float: right;
padding: 0.5em;
}
#preamble {
margin-top: 1.5em;
margin-bottom: 1.5em;
}
div.tableblock, div.imageblock, div.exampleblock, div.verseblock,
div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
div.admonitionblock {
margin-top: 1.5em;
margin-bottom: 1.5em;
}
div.admonitionblock {
margin-top: 2.5em;
margin-bottom: 2.5em;
}
#content { /* Block element content. */
margin: 2em;
}
/* Block element titles. */
div.title, caption.title {
color: #444466;
font-weight: bold;
text-align: left;
margin-top: 1.0em;
margin-bottom: 0.5em;
}
div.title + * {
margin-top: 0;
}
td div.title:first-child {
margin-top: 0.0em;
}
div.content div.title:first-child {
margin-top: 0.0em;
}
div.content + div.title {
margin-top: 0.0em;
}
div.sidebarblock > div.content {
background: #ffffee;
border: 1px solid silver;
padding: 0.5em;
}
div.listingblock > div.content {
border: 1px solid silver;
background: #f4f4f4;
padding: 0.5em;
}
div.quoteblock {
padding-left: 2.0em;
margin-right: 10%;
}
div.quoteblock > div.attribution {
padding-top: 0.5em;
text-align: right;
}
div.verseblock {
padding-left: 2.0em;
margin-right: 10%;
}
div.verseblock > pre.content {
font-family: inherit;
}
div.verseblock > div.attribution {
padding-top: 0.75em;
text-align: left;
}
/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
div.verseblock + div.attribution {
text-align: left;
}
div.admonitionblock .icon {
vertical-align: top;
font-size: 1.1em;
font-weight: bold;
text-decoration: underline;
color: #444466;
padding-right: 0.5em;
}
div.admonitionblock td.content {
padding-left: 0.5em;
border-left: 2px solid silver;
}
div.exampleblock > div.content {
border-left: 2px solid silver;
padding: 0.5em;
}
div.imageblock div.content { padding-left: 0; }
span.image img { border-style: none; }
a.image:visited { color: white; }
dl {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
dt {
margin-top: 0.5em;
margin-bottom: 0;
font-style: normal;
color: #444466;
}
dd > *:first-child {
margin-top: 0.1em;
}
ul, ol {
list-style-position: outside;
}
ol.arabic {
list-style-type: decimal;
}
ol.loweralpha {
list-style-type: lower-alpha;
}
ol.upperalpha {
list-style-type: upper-alpha;
}
ol.lowerroman {
list-style-type: lower-roman;
}
ol.upperroman {
list-style-type: upper-roman;
}
div.compact ul, div.compact ol,
div.compact p, div.compact p,
div.compact div, div.compact div {
margin-top: 0.1em;
margin-bottom: 0.1em;
}
div.tableblock > table {
border: 3px solid #444466;
}
thead {
font-weight: bold;
color: #444466;
}
tfoot {
font-weight: bold;
}
td > div.verse {
white-space: pre;
}
p.table {
margin-top: 0;
}
/* Because the table frame attribute is overridden by CSS in most browsers. */
div.tableblock > table[frame="void"] {
border-style: none;
}
div.tableblock > table[frame="hsides"] {
border-left-style: none;
border-right-style: none;
}
div.tableblock > table[frame="vsides"] {
border-top-style: none;
border-bottom-style: none;
}
div.hdlist {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
div.hdlist tr {
padding-bottom: 15px;
}
dt.hdlist1.strong, td.hdlist1.strong {
font-weight: bold;
}
td.hdlist1 {
vertical-align: top;
font-style: normal;
padding-right: 0.8em;
color: #444466;
}
td.hdlist2 {
vertical-align: top;
}
div.hdlist.compact tr {
margin: 0;
padding-bottom: 0;
}
.comment {
background: yellow;
}
@media print {
#footer-badges { display: none; }
}
#toctitle {
color: #666688;
font-size: 1.2em;
font-weight: bold;
margin-top: 1.0em;
margin-bottom: 0.1em;
}
div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 { margin-top: 0; margin-bottom: 0; }
div.toclevel1 { margin-top: 0.3em; margin-left: 0; font-size: 1.0em; }
div.toclevel2 { margin-top: 0.25em; margin-left: 2em; font-size: 0.9em; }
div.toclevel3 { margin-left: 4em; font-size: 0.8em; }
div.toclevel4 { margin-left: 6em; font-size: 0.8em; }
body {
margin: 0;
padding: 0;
}
.monospaced, tt, div.listingblock > div.content {
font-family: Consolas, "Andale Mono", "Courier New", monospace;
color: #004400;
background: #f4f4f4;
max-width: 80em;
line-height: 1.2em;
}
#header {
text-align: center;
margin: 2em;
}
#toc {
text-align: left;
margin-left: 3em;
max-width: 80%;
}
.paragraph p {
line-height: 1.5em;
/* margin: 1em; */
}
.paragraph p, li, dd, .content { max-width: 80em; }
.admonitionblock { max-width: 35em; }
div.sectionbody div.ulist > ul > li {
list-style-type: square;
color: #aaa;
}
div.sectionbody div.ulist > ul > li > * {
color: black;
/*font-size: 50%;*/
}
div.sectionbody div.ulist > ul > li div.ulist > ul > li {
color: #ccd ;
}
div.sectionbody div.ulist > ul > li div.ulist > ul > li > * {
color: black ;
}
em {
font-style: normal ! important;
font-weight: bold ! important;
color: #662222 ! important;
letter-spacing:+0.08em ! important;
}
span.underline { text-decoration: underline; }
span.overline { text-decoration: overline; }
span.line-through { text-decoration: line-through; }
/*
* html5 specific
*
* */
table.tableblock {
margin-top: 1.0em;
margin-bottom: 1.5em;
}
thead, p.tableblock.header {
font-weight: bold;
color: #666688;
}
p.tableblock {
margin-top: 0;
}
table.tableblock {
border-width: 3px;
border-spacing: 0px;
border-style: solid;
border-color: #444466;
border-collapse: collapse;
}
th.tableblock, td.tableblock {
border-width: 1px;
padding: 4px;
border-style: solid;
border-color: #444466;
}
table.tableblock.frame-topbot {
border-left-style: hidden;
border-right-style: hidden;
}
table.tableblock.frame-sides {
border-top-style: hidden;
border-bottom-style: hidden;
}
table.tableblock.frame-none {
border-style: hidden;
}
th.tableblock.halign-left, td.tableblock.halign-left {
text-align: left;
}
th.tableblock.halign-center, td.tableblock.halign-center {
text-align: center;
}
th.tableblock.halign-right, td.tableblock.halign-right {
text-align: right;
}
th.tableblock.valign-top, td.tableblock.valign-top {
vertical-align: top;
}
th.tableblock.valign-middle, td.tableblock.valign-middle {
vertical-align: middle;
}
th.tableblock.valign-bottom, td.tableblock.valign-bottom {
vertical-align: bottom;
}
</style>
<script type="text/javascript">
/*<+'])');
// Function that scans the DOM tree for header elements (the DOM2
// nodeIterator API would be a better technique but not supported by all
// browsers).
var iterate = function (el) {
for (var i = el.firstChild; i != null; i = i.nextSibling) {
if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
var mo = re.exec(i.tagName);
if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
}
iterate(i);
}
}
}
iterate(el);
return result;
}
var toc = document.getElementById("toc");
if (!toc) {
return;
}
// Delete existing TOC entries in case we're reloading the TOC.
var tocEntriesToRemove = [];
var i;
for (i = 0; i < toc.childNodes.length; i++) {
var entry = toc.childNodes[i];
if (entry.nodeName.toLowerCase() == 'div'
&& entry.getAttribute("class")
&& entry.getAttribute("class").match(/^toclevel/))
tocEntriesToRemove.push(entry);
}
for (i = 0; i < tocEntriesToRemove.length; i++) {
toc.removeChild(tocEntriesToRemove[i]);
}
// Rebuild TOC entries.
var entries = tocEntries(document.getElementById("content"), toclevels);
for (var i = 0; i < entries.length; ++i) {
var entry = entries[i];
if (entry.element.id == "")
entry.element.id = "_toc_" + i;
var a = document.createElement("a");
a.href = "#" + entry.element.id;
a.appendChild(document.createTextNode(entry.text));
var div = document.createElement("div");
div.appendChild(a);
div.className = "toclevel" + entry.toclevel;
toc.appendChild(div);
}
if (entries.length == 0)
toc.parentNode.removeChild(toc);
},
/////////////////////////////////////////////////////////////////////
// Footnotes generator
/////////////////////////////////////////////////////////////////////
/* Based on footnote generation code from:
* http://www.brandspankingnew.net/archive/2005/07/format_footnote.html
*/
footnotes: function () {
// Delete existing footnote entries in case we're reloading the footnodes.
var i;
var noteholder = document.getElementById("footnotes");
if (!noteholder) {
return;
}
var entriesToRemove = [];
for (i = 0; i < noteholder.childNodes.length; i++) {
var entry = noteholder.childNodes[i];
if (entry.nodeName.toLowerCase() == 'div' && entry.getAttribute("class") == "footnote")
entriesToRemove.push(entry);
}
for (i = 0; i < entriesToRemove.length; i++) {
noteholder.removeChild(entriesToRemove[i]);
}
// Rebuild footnote entries.
var cont = document.getElementById("content");
var spans = cont.getElementsByTagName("span");
var refs = {};
var n = 0;
for (i=0; i<spans.length; i++) {
if (spans[i].className == "footnote") {
n++;
var note = spans[i].getAttribute("data-note");
if (!note) {
// Use [\s\S] in place of . so multi-line matches work.
// Because JavaScript has no s (dotall) regex flag.
note = spans[i].innerHTML.match(/\s*\[([\s\S]*)]\s*/)[1];
spans[i].innerHTML =
"[<a id='_footnoteref_" + n + "' href='#_footnote_" + n +
"' title='View footnote' class='footnote'>" + n + "</a>]";
spans[i].setAttribute("data-note", note);
}
noteholder.innerHTML +=
"<div class='footnote' id='_footnote_" + n + "'>" +
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<body class="article">
<div id="header">
<h1>(LADI) jackdbus</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p><span class="image">
<a class="image" href="https://github.com/LADI/jackdbus/actions">
<img src="https://github.com/LADI/jackdbus/actions/workflows/build.yml/badge.svg" alt="Build status badge">
</a>
</span>
<span class="image">
<a class="image" href="https://repology.org/metapackage/jack-audio-connection-kit/versions">
<img src="https://repology.org/badge/tiny-repos/jack-audio-connection-kit.svg" alt="Repology bandge">
</a>
</span></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph"><p>This software implements D-Bus endpoint for JACK server.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_brief_history">Brief History</h2>
<div class="sectionbody">
<div class="paragraph"><p>Initial version of <a href="https://github.com/LADI/jackdbus">jackdbus</a> was created
as part of LADI project and was ad-hoc modification of JACK1 codebase.
jackdbus for JACK1 was maintained first as a setup of ad-hoc patches,
then via Mercural and then via Git.
In 2008/2009, jackdbus was ported to jackdmp codebase along with an implementation
of the newly designed for the new need control API for JACK.
The result of this merge became known as
<a href="https://web.archive.org/web/20170106162202/http://lac.linuxaudio.org/2009/cdm/Thursday/01_Letz/01.pdf">JACK2</a>.
As of 2022, jackdbus is again maintained in LADI project.
The jackaudio.org version of jackdbus is considered older/alternative
implementation.</p></div>
<div class="paragraph"><p>For LADI specific issues, submit issues or pull request to LADI project.
For related discussions, you are invited to join
<a href="https://libera.chat/">Libera.Chat</a> channel #ladi</p></div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
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EQn3XQAAAABJRU5ErkJggg==">
</td>
<td class="content">Do not submit LADI specific issues to jackaudio project.</td>
</tr></table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_d_bus_access">D-Bus access</h2>
<div class="sectionbody">
<div class="paragraph"><p>D-Bus is an object model that provides IPC mechanism.
D-Bus supports autoactivation of objects,
thus making it simple and reliable to code a "single instance" application or daemon,
and to launch applications and daemons on demand when their services are needed.</p></div>
<div class="paragraph"><p>Improvements over classical "jackd" approach:</p></div>
<div class="ulist"><ul>
<li>
<p>
Simplified single thread model for control and monitor
applications. Various D-Bus language bindings make it trivial to
write control and monitor applications using scripting languages
like Python, Ruby, Perl, etc..
</p>
</li>
<li>
<p>
A log file is available for inspection even when autoactivation
happens by the first launched JACK application.
</p>
</li>
<li>
<p>
A real configuration file is used to persist settings to be
manipulated through configuration interface of JACK D-Bus object.
</p>
</li>
<li>
<p>
Improved graph inspection and control mechanism. JACK graph is
versioned. Connections, ports and clients have unique
(monotonically increasing) numeric IDs.
</p>
</li>
<li>
<p>
High level abstraction of JACK settings. Allows applications that
can configure JACK to expose parameters that were not known at
compile (or tarball release) time. Recent real world examples are
the JACK MIDI driver parameters and support for FFADO driver in
QJackCtl. Upgrading of JACK requires upgrade of QJackCtl in order
to make new settings available in the GUI.
</p>
</li>
</ul></div>
<div class="sect2">
<h3 id="_how_it_works">How it works</h3>
<div class="sect3">
<h4 id="_autoactivation_and_starting_stopping_jack_server">Autoactivation and starting/stopping JACK server</h4>
<div class="paragraph"><p>First, application that issues D-Bus method call to JACK controller object,
causes D-Bus session daemon to activate the object by starting the jackdbus executable.
Activating controller object does not start the server.
Instead controller object has several interfaces.
The most important of them is the control interface.
Control interface contains methods for starting and stopping JACK server,
loading and unloading of internal clients (netjack),
setting buffer size and resetting xrun counter.
It also contains methods for querying information required by monitoring
applications:</p></div>
<div class="ulist"><ul>
<li>
<p>
whether JACK server is started
</p>
</li>
<li>
<p>
whether JACK server is running in realtime mode
</p>
</li>
<li>
<p>
sample rate
</p>
</li>
<li>
<p>
DSP load
</p>
</li>
<li>
<p>
current buffer size
</p>
</li>
<li>
<p>
latency
</p>
</li>
<li>
<p>
xrun counter
</p>
</li>
</ul></div>
<div class="paragraph"><p>JACK server autostart is achieved by libjack calling "jack server start" method of
JACK control D-Bus interface.</p></div>
</div>
<div class="sect3">
<h4 id="_jack_settings">JACK settings</h4>
<div class="paragraph"><p>Applications that want to manage JACK settings can query
and set all settings that were traditionally specified as
jackd command-line parameters.
Interface abstraction provides virtual tree of parameter
containers with container leaves that contain parameters.
Parameters are accessed using simple addressing scheme (array of strings)
where address defines path to parameter, like "drivers", "alsa", "dither".</p></div>
<div class="paragraph"><p>Overview of the tree of standard settings' addresses:</p></div>
<div class="ulist"><ul>
<li>
<p>
"engine"
</p>
</li>
<li>
<p>
"engine", "driver"
</p>
</li>
<li>
<p>
"engine", "realtime"
</p>
</li>
<li>
<p>
"engine", …more engine parameters
</p>
</li>
<li>
<p>
"driver", "device"
</p>
</li>
<li>
<p>
"driver", …more driver parameters
</p>
</li>
<li>
<p>
"drivers", "alsa", "device"
</p>
</li>
<li>
<p>
"drivers", "alsa", …more alsa driver parameters
</p>
</li>
<li>
<p>
"drivers", …more drivers
</p>
</li>
<li>
<p>
"internals", "netmanager", "multicast ip"
</p>
</li>
<li>
<p>
"internals", "netmanager", …more netmanager parameters
</p>
</li>
<li>
<p>
"internals", …more internals
</p>
</li>
</ul></div>
<div class="paragraph"><p>JACK settings are persisted.
I.e. they are automatically saved by jackdbus when they are set.
Next time user starts JACK server, last saved settings will be automatically used.
Changing JACK settings through the configure D-Bus interface takes effect on next
JACK server start.
On the fly change of the buffer size, as available in the libjack
(jack.h) API, is also possible through the control D-Bus interface.</p></div>
</div>
<div class="sect3">
<h4 id="_jack_parameter_constraints">JACK parameter constraints</h4>
<div class="paragraph"><p>JACK internal modules that provide parameters visible through control API can provide
information about parameter valid range (like realtime priority) or
whether parameter should be presented as enumeration.
Enumeration parameters can be strict and non-strict.
Example of strict enum parameter is dither parameter of ALSA driver,
it has only predefined valid values: "shaped noise",
"rectangular", "triangualr" and "none".</p></div>
<div class="paragraph"><p>Example of non-strict parameter is device parameter of ALSA driver.
It is useful to provide some detected device strings as choices to user,
but still allow user to specify custom string that ALSA layer is supposed to
understand.</p></div>
</div>
<div class="sect3">
<h4 id="_jack_patchbay">JACK patchbay</h4>
<div class="paragraph"><p>In order to simplify patchbay applications, extended functionality is provided.
There is a method that returns the current graph state.
Graph state has unique monotonically increasing version number
and contains info about all clients, their ports and connections.
Connections, ports and clients have unique numeric IDs
that are guaranteed not to be reused.
Notifica tions about graph changes are provided using
D-Bus signals.</p></div>
</div>
</div>
<div class="sect2">
<h3 id="_jack_d_bus_enabled_applications">JACK D-Bus enabled applications</h3>
<div class="sect3">
<h4 id="_jack_control">jack_control</h4>
<div class="paragraph"><p>JACK contains "jack_control" executable, <a href="https://gitea.ladish.org/LADI/jackdbus/src/branch/stable/dbus/jack_control">a 300 lines of Python</a> exposing
JACK D-Bus functionality. It allows chained execution of several commands.
For example "jack control ds alsa dps midi-driver raw eps realtime on