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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
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<meta name="generator" content="AsciiDoc 8.6.7" />
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<title>upmpdcli Linn Songcast integration</title>
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<style type="text/css">
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/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
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/* Default font. */
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body {
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font-family: Georgia,serif;
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}
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/* Title font. */
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h1, h2, h3, h4, h5, h6,
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div.title, caption.title,
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thead, p.table.header,
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#toctitle,
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#author, #revnumber, #revdate, #revremark,
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#footer {
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font-family: Arial,Helvetica,sans-serif;
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}
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body {
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margin: 1em 5% 1em 5%;
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}
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a {
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color: blue;
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text-decoration: underline;
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}
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a:visited {
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color: fuchsia;
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}
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em {
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font-style: italic;
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color: navy;
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}
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strong {
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font-weight: bold;
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color: #083194;
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}
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h1, h2, h3, h4, h5, h6 {
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color: #527bbd;
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margin-top: 1.2em;
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margin-bottom: 0.5em;
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line-height: 1.3;
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}
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h1, h2, h3 {
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border-bottom: 2px solid silver;
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}
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h2 {
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padding-top: 0.5em;
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}
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h3 {
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float: left;
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}
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h3 + * {
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clear: left;
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}
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h5 {
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font-size: 1.0em;
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}
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div.sectionbody {
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margin-left: 0;
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}
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hr {
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border: 1px solid silver;
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}
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p {
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margin-top: 0.5em;
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margin-bottom: 0.5em;
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}
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ul, ol, li > p {
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margin-top: 0;
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}
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ul > li { color: #aaa; }
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ul > li > * { color: black; }
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pre {
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padding: 0;
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margin: 0;
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}
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#author {
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color: #527bbd;
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font-weight: bold;
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font-size: 1.1em;
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}
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#email {
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}
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#revnumber, #revdate, #revremark {
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}
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#footer {
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font-size: small;
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border-top: 2px solid silver;
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padding-top: 0.5em;
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margin-top: 4.0em;
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}
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#footer-text {
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float: left;
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padding-bottom: 0.5em;
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}
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#footer-badges {
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float: right;
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padding-bottom: 0.5em;
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}
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#preamble {
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margin-top: 1.5em;
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margin-bottom: 1.5em;
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}
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div.imageblock, div.exampleblock, div.verseblock,
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div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
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div.admonitionblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.admonitionblock {
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margin-top: 2.0em;
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margin-bottom: 2.0em;
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margin-right: 10%;
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color: #606060;
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}
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div.content { /* Block element content. */
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padding: 0;
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}
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/* Block element titles. */
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div.title, caption.title {
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color: #527bbd;
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font-weight: bold;
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text-align: left;
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margin-top: 1.0em;
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margin-bottom: 0.5em;
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}
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div.title + * {
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margin-top: 0;
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}
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td div.title:first-child {
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margin-top: 0.0em;
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}
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div.content div.title:first-child {
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margin-top: 0.0em;
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}
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div.content + div.title {
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margin-top: 0.0em;
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}
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div.sidebarblock > div.content {
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background: #ffffee;
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border: 1px solid #dddddd;
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border-left: 4px solid #f0f0f0;
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padding: 0.5em;
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}
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div.listingblock > div.content {
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border: 1px solid #dddddd;
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border-left: 5px solid #f0f0f0;
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background: #f8f8f8;
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padding: 0.5em;
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}
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div.quoteblock, div.verseblock {
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padding-left: 1.0em;
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margin-left: 1.0em;
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margin-right: 10%;
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border-left: 5px solid #f0f0f0;
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color: #888;
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}
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div.quoteblock > div.attribution {
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padding-top: 0.5em;
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text-align: right;
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}
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div.verseblock > pre.content {
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font-family: inherit;
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font-size: inherit;
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}
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div.verseblock > div.attribution {
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padding-top: 0.75em;
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text-align: left;
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}
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/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
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div.verseblock + div.attribution {
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text-align: left;
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}
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202 |
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div.admonitionblock .icon {
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vertical-align: top;
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font-size: 1.1em;
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font-weight: bold;
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text-decoration: underline;
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color: #527bbd;
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padding-right: 0.5em;
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}
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div.admonitionblock td.content {
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padding-left: 0.5em;
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border-left: 3px solid #dddddd;
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}
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div.exampleblock > div.content {
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border-left: 3px solid #dddddd;
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padding-left: 0.5em;
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}
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220 |
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div.imageblock div.content { padding-left: 0; }
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span.image img { border-style: none; }
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a.image:visited { color: white; }
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224 |
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dl {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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dt {
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margin-top: 0.5em;
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margin-bottom: 0;
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font-style: normal;
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color: navy;
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}
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dd > *:first-child {
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margin-top: 0.1em;
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}
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238 |
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ul, ol {
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list-style-position: outside;
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}
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242 |
ol.arabic {
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list-style-type: decimal;
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}
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ol.loweralpha {
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list-style-type: lower-alpha;
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}
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248 |
ol.upperalpha {
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249 |
list-style-type: upper-alpha;
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}
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ol.lowerroman {
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list-style-type: lower-roman;
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}
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254 |
ol.upperroman {
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255 |
list-style-type: upper-roman;
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}
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257 |
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258 |
div.compact ul, div.compact ol,
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div.compact p, div.compact p,
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260 |
div.compact div, div.compact div {
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261 |
margin-top: 0.1em;
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262 |
margin-bottom: 0.1em;
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263 |
}
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264 |
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265 |
tfoot {
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266 |
font-weight: bold;
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267 |
}
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268 |
td > div.verse {
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269 |
white-space: pre;
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270 |
}
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271 |
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272 |
div.hdlist {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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div.hdlist tr {
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277 |
padding-bottom: 15px;
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278 |
}
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dt.hdlist1.strong, td.hdlist1.strong {
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280 |
font-weight: bold;
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281 |
}
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282 |
td.hdlist1 {
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vertical-align: top;
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284 |
font-style: normal;
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285 |
padding-right: 0.8em;
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286 |
color: navy;
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}
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td.hdlist2 {
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vertical-align: top;
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}
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div.hdlist.compact tr {
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margin: 0;
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padding-bottom: 0;
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}
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.comment {
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background: yellow;
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}
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.footnote, .footnoteref {
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font-size: 0.8em;
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}
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span.footnote, span.footnoteref {
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vertical-align: super;
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}
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#footnotes {
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margin: 20px 0 20px 0;
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padding: 7px 0 0 0;
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}
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#footnotes div.footnote {
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margin: 0 0 5px 0;
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}
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#footnotes hr {
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border: none;
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border-top: 1px solid silver;
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height: 1px;
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text-align: left;
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margin-left: 0;
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width: 20%;
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min-width: 100px;
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}
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div.colist td {
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padding-right: 0.5em;
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padding-bottom: 0.3em;
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330 |
vertical-align: top;
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}
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div.colist td img {
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margin-top: 0.3em;
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}
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336 |
@media print {
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337 |
#footer-badges { display: none; }
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338 |
}
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339 |
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340 |
#toc {
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341 |
margin-bottom: 2.5em;
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342 |
}
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343 |
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344 |
#toctitle {
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345 |
color: #527bbd;
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346 |
font-size: 1.1em;
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347 |
font-weight: bold;
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348 |
margin-top: 1.0em;
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349 |
margin-bottom: 0.1em;
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350 |
}
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351 |
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352 |
div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
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353 |
margin-top: 0;
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354 |
margin-bottom: 0;
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355 |
}
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356 |
div.toclevel2 {
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357 |
margin-left: 2em;
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358 |
font-size: 0.9em;
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359 |
}
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360 |
div.toclevel3 {
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361 |
margin-left: 4em;
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362 |
font-size: 0.9em;
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363 |
}
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364 |
div.toclevel4 {
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365 |
margin-left: 6em;
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366 |
font-size: 0.9em;
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367 |
}
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368 |
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369 |
span.aqua { color: aqua; }
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370 |
span.black { color: black; }
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371 |
span.blue { color: blue; }
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372 |
span.fuchsia { color: fuchsia; }
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373 |
span.gray { color: gray; }
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374 |
span.green { color: green; }
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375 |
span.lime { color: lime; }
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376 |
span.maroon { color: maroon; }
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377 |
span.navy { color: navy; }
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378 |
span.olive { color: olive; }
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379 |
span.purple { color: purple; }
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380 |
span.red { color: red; }
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381 |
span.silver { color: silver; }
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382 |
span.teal { color: teal; }
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383 |
span.white { color: white; }
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384 |
span.yellow { color: yellow; }
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385 |
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386 |
span.aqua-background { background: aqua; }
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387 |
span.black-background { background: black; }
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388 |
span.blue-background { background: blue; }
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389 |
span.fuchsia-background { background: fuchsia; }
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390 |
span.gray-background { background: gray; }
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391 |
span.green-background { background: green; }
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392 |
span.lime-background { background: lime; }
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393 |
span.maroon-background { background: maroon; }
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394 |
span.navy-background { background: navy; }
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395 |
span.olive-background { background: olive; }
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735 |
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736 |
</script>
|
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737 |
</head>
|
|
|
738 |
<body class="article">
|
|
|
739 |
<div id="header">
|
|
|
740 |
<h1>upmpdcli Linn Songcast integration</h1>
|
|
|
741 |
</div>
|
|
|
742 |
<div id="content">
|
|
|
743 |
<div id="preamble">
|
|
|
744 |
<div class="sectionbody">
|
|
|
745 |
<div class="paragraph"><p>The <strong>sc2mpd</strong> auxiliary process implements part of Linn <strong>Songcast</strong> support
|
|
|
746 |
for the <strong>upmdcli</strong> UPnP MPD front-end. Specifically, it implements a
|
|
|
747 |
<strong>Songcast</strong> <em>Receiver</em> service, managed by <strong>upmpdcli</strong>.</p></div>
|
|
|
748 |
<div class="paragraph"><p><strong><em>This has mostly been tested with 16 bits sound but a recent change seems
|
|
|
749 |
to have fixed 24 bits sound, so this should be now usable for MACs. This
|
|
|
750 |
needs mpd 0.19 on the renderer. Still be a bit careful as this is quite new
|
|
|
751 |
and there is a risk of strange noises !</em></strong></p></div>
|
|
|
752 |
<div class="paragraph"><p><strong><em>Do not try 24 bits sound with MPD 0.18 !</em></strong> (or turn the volume very
|
|
|
753 |
low…). Using Songcast from a Mac (24 bits audio) needs <strong>mpd 0.19</strong>,
|
|
|
754 |
configured with <tt>--disable-audiofile</tt>.</p></div>
|
|
|
755 |
<div class="paragraph"><p>As Debian and Ubuntu tend to lag quite bit on MPD progresses, I have setup
|
|
|
756 |
<a href="downloads.html#mpd">backport repositories</a> for recent mpd versions
|
|
|
757 |
(currently 0.19.9), for Ubuntu, Debian i386/amd64 and Raspbian.</p></div>
|
|
|
758 |
</div>
|
|
|
759 |
</div>
|
|
|
760 |
<div class="sect1">
|
|
|
761 |
<h2 id="_what_is_songcast">What is Songcast</h2>
|
|
|
762 |
<div class="sectionbody">
|
|
|
763 |
<div class="paragraph"><p>Songcast is a protocol for transporting audio streams across the
|
|
|
764 |
network. This is independant from the UPnP framework which mostly deals
|
|
|
765 |
with URLs and audio files (usually, but not necessarily, compressed).</p></div>
|
|
|
766 |
<div class="paragraph"><p>The streams transported by Songcast are actual real-time audio data, which
|
|
|
767 |
can go straight to an audio card for playing.</p></div>
|
|
|
768 |
<div class="paragraph"><p>Controlling the streams on the renderer (connecting, starting, stopping) is
|
|
|
769 |
done through an UPnP service named OpenHome <em>Receiver</em>.</p></div>
|
|
|
770 |
<div class="paragraph"><p>The typical use of Songcast is to have an audio driver on a Windows or OS X
|
|
|
771 |
desktop capture and forward the audio stream to a remote Songcast device.</p></div>
|
|
|
772 |
<div class="paragraph"><p>Any application on the desktop will (be compelled to) transparently play to
|
|
|
773 |
the remote device, without need to know anything about Songcast.</p></div>
|
|
|
774 |
</div>
|
|
|
775 |
</div>
|
|
|
776 |
<div class="sect1">
|
|
|
777 |
<h2 id="_implementation_of_songcast_support_in_upmpdcli">Implementation of Songcast support in upmpdcli</h2>
|
|
|
778 |
<div class="sectionbody">
|
|
|
779 |
<div class="paragraph"><p><strong>upmpdcli</strong> implements the <em>Receiver</em> service, and uses an auxiliary process
|
|
|
780 |
(<strong>sc2mpd</strong>) for transporting the audio data. <strong>sc2mpd</strong> is a slight
|
|
|
781 |
modification of the sample program which comes with the Linn Songcast
|
|
|
782 |
open-source implementation, with the addition of an HTTP interface (based
|
|
|
783 |
on <em>libmicrohttpd</em>) to forward the data to <strong>mpd</strong>.</p></div>
|
|
|
784 |
<div class="paragraph"><p>Setting up a connection happens as follows:</p></div>
|
|
|
785 |
<div class="ulist"><ul>
|
|
|
786 |
<li>
|
|
|
787 |
<p>
|
|
|
788 |
If it finds an executable <strong>sc2mpd</strong> command in the PATH when starting up,
|
|
|
789 |
<strong>upmpdcli</strong> advertises a <em>Receiver</em> service.
|
|
|
790 |
</p>
|
|
|
791 |
</li>
|
|
|
792 |
<li>
|
|
|
793 |
<p>
|
|
|
794 |
The Songcast implementation from the desktop finds out about the
|
|
|
795 |
<em>Receiver</em> through the normal UPnP mechanisms and can be instructed to
|
|
|
796 |
use it. It then tells the <em>Receiver</em> in <strong>upmpdcli</strong> to start playing.
|
|
|
797 |
</p>
|
|
|
798 |
</li>
|
|
|
799 |
<li>
|
|
|
800 |
<p>
|
|
|
801 |
<strong>upmdpcli</strong> starts the <strong>sc2mpd</strong> process, which gets ready to receive data
|
|
|
802 |
through Songcast, and make it available through HTTP.
|
|
|
803 |
</p>
|
|
|
804 |
</li>
|
|
|
805 |
<li>
|
|
|
806 |
<p>
|
|
|
807 |
<strong>upmpdcli</strong> instructs <strong>mpd</strong> to play the URL for the <strong>sc2mpd</strong> output.
|
|
|
808 |
</p>
|
|
|
809 |
</li>
|
|
|
810 |
</ul></div>
|
|
|
811 |
<div class="paragraph"><p>There is currently a 10-12 S delay between the connection request and the
|
|
|
812 |
moment the audio starts playing. This is not normal, but I could not find
|
|
|
813 |
the reason for it, so it’s an unavoidable inconvenience at the moment.</p></div>
|
|
|
814 |
</div>
|
|
|
815 |
</div>
|
|
|
816 |
<div class="sect1">
|
|
|
817 |
<h2 id="_configuration">Configuration</h2>
|
|
|
818 |
<div class="sectionbody">
|
|
|
819 |
<div class="paragraph"><p>No configuration is necessary by default: if <strong>sc2mpd</strong> is present,
|
|
|
820 |
<strong>upmpdcli</strong> will advertise the Songcast capability, and any host with a
|
|
|
821 |
Songcast sender installed should be able to use it.</p></div>
|
|
|
822 |
<div class="paragraph"><p>However, you can set a number of values in the upmpdcli configuration file
|
|
|
823 |
(you <strong>must</strong> set the <strong>upmpdcli</strong> <tt>-c</tt> option for <strong>sc2mpd</strong> to see them, the
|
|
|
824 |
environment variable will not work):</p></div>
|
|
|
825 |
<div class="dlist"><dl>
|
|
|
826 |
<dt class="hdlist1">
|
|
|
827 |
sclogfilename
|
|
|
828 |
</dt>
|
|
|
829 |
<dd>
|
|
|
830 |
<p>
|
|
|
831 |
Name of the file which will receive <strong>sc2mpd</strong> log messages. <tt>stderr</tt> by
|
|
|
832 |
default. This <em>can’t be</em> the same file used by <strong>upmpdcli</strong>.
|
|
|
833 |
</p>
|
|
|
834 |
</dd>
|
|
|
835 |
<dt class="hdlist1">
|
|
|
836 |
scloglevel
|
|
|
837 |
</dt>
|
|
|
838 |
<dd>
|
|
|
839 |
<p>
|
|
|
840 |
Log verbosity.
|
|
|
841 |
</p>
|
|
|
842 |
</dd>
|
|
|
843 |
<dt class="hdlist1">
|
|
|
844 |
schttpport
|
|
|
845 |
</dt>
|
|
|
846 |
<dd>
|
|
|
847 |
<p>
|
|
|
848 |
HTTP port used by <strong>mpd</strong> to connect to <strong>sc2mpd</strong>. 8888 by default. This must
|
|
|
849 |
be an available port on <tt>localhost</tt>, and it will only accept connections from
|
|
|
850 |
<tt>localhost</tt>.
|
|
|
851 |
</p>
|
|
|
852 |
</dd>
|
|
|
853 |
<dt class="hdlist1">
|
|
|
854 |
sc2mpd
|
|
|
855 |
</dt>
|
|
|
856 |
<dd>
|
|
|
857 |
<p>
|
|
|
858 |
Path for the <strong>sc2mpd</strong> executable file (e.g. <tt>/usr/local/bin/sc2mpd</tt>). Only
|
|
|
859 |
useful if <strong>sc2mpd</strong> was not installed to a location in the executable $PATH
|
|
|
860 |
set for the init scripts. Typically only <tt>/bin</tt> and <tt>/usr/bin</tt> are in
|
|
|
861 |
there.
|
|
|
862 |
</p>
|
|
|
863 |
</dd>
|
|
|
864 |
</dl></div>
|
|
|
865 |
</div>
|
|
|
866 |
</div>
|
|
|
867 |
<div class="sect1">
|
|
|
868 |
<h2 id="_building_sc2mpd">Building sc2mpd</h2>
|
|
|
869 |
<div class="sectionbody">
|
|
|
870 |
<div class="paragraph"><p>There are two parts in building <strong>sc2mpd</strong>:</p></div>
|
|
|
871 |
<div class="ulist"><ul>
|
|
|
872 |
<li>
|
|
|
873 |
<p>
|
|
|
874 |
Building the Openhome libraries
|
|
|
875 |
</p>
|
|
|
876 |
</li>
|
|
|
877 |
<li>
|
|
|
878 |
<p>
|
|
|
879 |
Building <strong>sc2mpd</strong> proper
|
|
|
880 |
</p>
|
|
|
881 |
</li>
|
|
|
882 |
</ul></div>
|
|
|
883 |
<div class="paragraph"><p>First clone the <strong>sc2mpd</strong> Github repository:
|
|
|
884 |
<a href="http://www.github.com/medoc92/sc2mpd">http://www.github.com/medoc92/sc2mpd</a>.</p></div>
|
|
|
885 |
<div class="paragraph"><p><strong>sc2mpd</strong> depends on the microhttpd library. Install the development and
|
|
|
886 |
runtime packages which are currently named <em>libmicrohttpd-dev</em> and
|
|
|
887 |
<em>libmicrohttpd10</em> on Debian-derived systems (use <em>libmicrohttpd</em> and
|
|
|
888 |
<em>libmicrohttpd-devel</em> for Fedora).</p></div>
|
|
|
889 |
<div class="paragraph"><p>Building the Openhome libraries is a bit of a black art, and the <strong>sc2mpd</strong>
|
|
|
890 |
source comes with an <em>ohbuild.sh</em> script which will try to clone the
|
|
|
891 |
Openhome Git repositories and build the libs:</p></div>
|
|
|
892 |
<div class="literalblock">
|
|
|
893 |
<div class="content">
|
|
|
894 |
<pre><tt>cd sc2mpd
|
|
|
895 |
mkdir /my/place/for/openhome
|
|
|
896 |
sh ohbuild.sh /my/place/for/openhome</tt></pre>
|
|
|
897 |
</div></div>
|
|
|
898 |
<div class="paragraph"><p>Miscellaneous error messages will be displayed during the build. Hope for
|
|
|
899 |
the best…</p></div>
|
|
|
900 |
<div class="paragraph"><p>When this is done, build <strong>sc2mpd</strong>, using the following commands inside the
|
|
|
901 |
<em>sc2mpd</em> directory:</p></div>
|
|
|
902 |
<div class="literalblock">
|
|
|
903 |
<div class="content">
|
|
|
904 |
<pre><tt>sh autogen.sh
|
|
|
905 |
./configure --prefix=/usr --with-openhome=/my/place/for/openhome
|
|
|
906 |
make
|
|
|
907 |
sudo make install</tt></pre>
|
|
|
908 |
</div></div>
|
|
|
909 |
<div class="paragraph"><p>The build uses static Openhome libraries, so you can move the executable to
|
|
|
910 |
another machine without needing the Openhome directory (don’t forget to
|
|
|
911 |
install the <em>libmicrohttpd</em> runtime though).</p></div>
|
|
|
912 |
<div class="paragraph"><p>After restarting <strong>upmpdcli</strong>, it should advertise the <em>Receiver</em> service and
|
|
|
913 |
appear in the Songcast Sender menus.</p></div>
|
|
|
914 |
</div>
|
|
|
915 |
</div>
|
|
|
916 |
<div class="sect1">
|
|
|
917 |
<h2 id="_miscellaneous_remarks">Miscellaneous remarks</h2>
|
|
|
918 |
<div class="sectionbody">
|
|
|
919 |
<div class="paragraph"><p>Songcast is probably best transported over a wired connection. If you are
|
|
|
920 |
doing this over WIFI and experiencing glitches, the wireless is the first
|
|
|
921 |
suspect.</p></div>
|
|
|
922 |
</div>
|
|
|
923 |
</div>
|
|
|
924 |
</div>
|
|
|
925 |
<div id="footnotes"><hr /></div>
|
|
|
926 |
<div id="footer">
|
|
|
927 |
<div id="footer-text">
|
|
|
928 |
Last updated 2015-04-07 11:24:19 CEST
|
|
|
929 |
</div>
|
|
|
930 |
</div>
|
|
|
931 |
</body>
|
|
|
932 |
</html>
|