Add XSLT stylesheet that rewrites SegmentTemplate media attributes

tests/fixtures/rewrite-resolution.xslt

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xsl:stylesheet version="1.0"
+ xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+ xmlns:mpd="urn:mpeg:dash:schema:mpd:2011">
+ <xsl:output method="xml" indent="yes"/>
+
+ <!-- Default action (unless a template below matches): copy -->
+ <xsl:template match="@*|node()">
+ <xsl:copy>
+ <xsl:apply-templates select="@*|node()"/>
+ </xsl:copy>
+ </xsl:template>
+
+ <!-- This stylesheet modifies the @media attribute on the SegmentTemplate of the AdaptationSet
+ with id=2, setting it to the string '1080p'. This is a way of overriding the DASH template
+ resolution process. A template might be using "$RepresentationID$_$Number$.mp4" and you want
+ to force the RepresentationID to be 1080p for example.
+ 
+ Note that simple XPath expressions like "//AdaptationSet[@id=2]/SegmentTemplate/@media" fail
+ on an MPD manifest that defines a namespace (@xmlns on the MPD element, which is very often
+ present). This is why we use local-name().
+ -->
+ <xsl:template match="//node()[local-name()='AdaptationSet' and @id='2']/node()[local-name()='SegmentTemplate']/@media">
+ <xsl:attribute name="media">
+ <xsl:value-of select="'1080p_$Number$'"/>
+ </xsl:attribute>
+ </xsl:template>
+</xsl:stylesheet>