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{{/* Returns the page's audio resources, best sounding first, so that a
browser takes the best encoding it can play and the capsule links
the best single file. Public listening tests put Opus ahead of the
field at the bitrates spoken word uses, with Vorbis and AAC close
behind it and MP3 last. Lossless comes after the lossy codecs
rather than before, since a browser that can play FLAC would
otherwise fetch several times the bytes for no audible gain.
Hugo reports .opus, .oga and .ogg alike as audio/ogg, so the
extension is what tells the codecs apart. Formats not listed here
keep Hugo's own order at the end. Returns an empty slice when there
is no audio. */ -}}
{{ $preferred := slice ".opus" ".ogg" ".oga" ".m4a" ".aac" ".mp3" ".flac" ".wav" -}}
{{ $audio := where .Resources "MediaType.MainType" "audio" -}}
{{ $ordered := slice -}}
{{ range $extension := $preferred -}}
{{ range $audio -}}
{{ if eq (lower (path.Ext .Name)) $extension -}}
{{ $ordered = $ordered | append . -}}
{{ end -}}
{{ end -}}
{{ end -}}
{{ range $audio -}}
{{ if not (in $preferred (lower (path.Ext .Name))) -}}
{{ $ordered = $ordered | append . -}}
{{ end -}}
{{ end -}}
{{ return $ordered }}
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