Thanks. I look forward to giving this a
go.
Peter
On 23/09/2014 11:15, Jirka Kosek wrote:
[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=""/>
<audio src="" clipBegin="0:00:02.000"
clipEnd="0:00:15.000"/>
</par>
<par id="paragraph2">
<text src=""/>
<audio src="" 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="" media-type="application/x-dtbncx+xml"/>
<item id="htmltoc" properties="nav"
media-type="application/xhtml+xml" href=""/>
<item media-type="text/css" id="docbook-css" href=""/>
<item id="id-idm21776" href=""
media-type="application/xhtml+xml" media-overlay="chapter1_overlay"/>
<item id="chapter1_overlay" href=""
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