The method is used to get information of files in the media library - such as filename, size, height, width.
Parameters
GetMedia(int MediaId, bool Deep);
Integer MediaId
Boolean Deep
Return value
The method returns a XPathNodeIterator with the information of selected file.
Usage
<xsl:value-of select="umbraco.library:GetMedia(./data [@alias = 'yourProperty'], 0)"/>
Getting the url of a media file with hardcoded ID
<xsl:value-of select="umbraco.library:GetMedia(1057, 0)/data [@alias = 'umbracoFile']"/>
Getting the url of a media file using a mediaPicker
<xsl:value-of select="umbraco.library:GetMedia($currentPage/data[@alias='yourProperty'], 0)/data [@alias = 'umbracoFile']"/>
How to render an image from XSLT
Assuming the property alias is 'bannerImage' then:
<xsl:variable name="media" select="umbraco.library:GetMedia($currentPage/data[@alias='bannerImage'], 0)/data" />
<xsl:if test="$media">
<xsl:variable name="url" select="$media [@alias = 'umbracoFile']" />
<xsl:variable name="width" select="$media [@alias = 'umbracoWidth']" />
<xsl:variable name="height" select="$media [@alias = 'umbracoHeight']" />
<img src="{$url}" width="{$width}" height="{$height}" />
</xsl:if>
In the new syntax (Umbraco 4.5.1 onwards) this has changed to:
<xsl:variable name="media" select="umbraco.library:GetMedia($currentPage/imageAlias, 0)" />
<xsl:if test="$media">
<img src="{$media/umbracoFile}" alt="{$media/altText}" />
</xsl:if>
If you are using Umbraco 4.5.0, there was a minor bug with GetMedia where you need to reference the root element (nodeTypeAlias). i.e. "$media/Image/umbracoFile". That bug was fixed in Umbraco 4.5.1.
PLEASE NOTE: This has been copied directly from the old Umbraco Wiki. Kudos to the original poster.