[Replying to docbook-apps where this belongs...] On 18.9.2014 15:38, Peter Fleck wrote: > Is it possible to do a lot of the work to make audio epubs using > stylesheets?
Everything is possible, it depends on effort you can put into it :-)
> First, how to auto generate ids for each <para>? I'm sure that is
> straightforward. (Or if more granularity is needed then id's at the
> sentence or word level as needed).
Putting following into your customization layer should do the trick:
<xsl:param name="generate.id.attributes" select="1"/>
<xsl:param name="generate.consistent.ids" select="1"/>
<xsl:template name="id.attribute">
<xsl:param name="node" select="."/>
<xsl:param name="conditional" select="0"/>
<xsl:choose>
<xsl:when test="$generate.id.attributes = 0">
<!-- No id attributes when this param is zero -->
</xsl:when>
<xsl:when test="$conditional = 0 or $node/@id or $node/@xml:id">
<xsl:attribute name="id">
<xsl:call-template name="object.id">
<xsl:with-param name="object" select="$node"/>
</xsl:call-template>
</xsl:attribute>
</xsl:when>
</xsl:choose>
</xsl:template>
However if you change your DocBook source autogenerated IDs will change.
> Second, populate the smil file with the ids
>
> <smil xmlns="http://www.w3.org/ns/SMIL";
> xmlns:epub="http://www.idpf.org/2007/ops"; version="3.0">
> <body>
> <seq id="id1" epub:textref="index.xhtml" epub:type="bodymatter
> chapter">
> <par id="paragraph1">
> <text src="index.xhtml#para-id1"/>
> <audio src="audio/file.mp3" clipBegin="0:00:02.000"
> clipEnd="0:00:15.000"/>
> </par>
> <par id="paragraph2">
> <text src="index.xhtml#para-id2"/>
> <audio src="audio/file.mp3" clipBegin="0:00:15.000"
> clipEnd="0:00:25.000"/>
> </par>
> ....
> </seq>
> </body>
> </smil>
>
> The smil file would need manually editing for the clipBegin and clipEnd
> for each but that's fine. The audio src could be passed as a parameter.
> Then add something like .-epub-media-overlay-active {background-color:
> #abc;} to the css.
Have you considered generating this SMIL file automatically? I can
imagine putting custom attributes into DocBook document, something like:
<chapter my:audio="file.mp3">
<title>Foo</title>
<para my:begin="0:00:02.000" my:end="0:00:15.000">...</para>
<para my:begin="0:00:15.000" my:end="0:00:25.000">...</para>
...
From such markup you can quite easily generate SMIL file automatically.
> Finally modify the package.opf to add
>
> <meta property="media:duration"
> refines="#chapter1_overlay">0:04:30.000</meta>
> <meta property="media:duration"
> refines="#chapter2_overlay">0:03:30.000</meta>
> ....
> <meta property="media:duration">0:08:00.000</meta>
> <meta property="media:narrator">Narrator Name</meta>
> <meta property="media:active-class">-epub-media-overlay-active</meta>
> </metadata>
> <manifest>
> <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml"/>
> <item id="htmltoc" properties="nav"
> media-type="application/xhtml+xml" href="ar01-toc.xhtml"/>
> <item media-type="text/css" id="docbook-css" href="docbook-epub.css"/>
> <item id="id-idm21776" href="index.xhtml"
> media-type="application/xhtml+xml" media-overlay="chapter1_overlay"/>
> <item id="chapter1_overlay" href="chapter1_overlay.smil"
> media-type="application/smil+xml"/>
> ....
>
> Is something like this doable?
Yes, generation of OPF file is split into set of relative small
templates which you can easily override. Look into
epub3/epu3-element-mods.xsl file. For example metadata part is generated
by the following template:
<xsl:template name="package.metadata">
<xsl:element name="metadata" namespace="{$opf.namespace}">
<xsl:call-template name="metadata.identifier"/>
<xsl:call-template name="metadata.title"/>
<xsl:call-template name="metadata.language"/>
<xsl:call-template name="metadata.modified"/>
<xsl:call-template name="metadata.cover"/>
<xsl:call-template name="metadata.other.info"/>
</xsl:element>
</xsl:template>
You can generate this template manually, or put your custom elements
inside <info> elements and handle them in special opf.metadata mode.
<info>
...
<media:narrator>Narrator Name</media:narrator>
</info>
<xsl:template match="media:*" mode="opf.metadata">
<meta property="media:{local-name(.)}"><xsl:value-of select="."/></meta>
</xsl:template>
HTH,
Jirka
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