[Previews] Audio preview

[javiergonzper]

As a user, i want the possibility to play an audio file on the ownCloud iOS App

AC:

• The file should be streamed (not downloaded).
• The audio should works also in background.
• The audio should be controlled also by the system controls (MPRemoteCommandCenter ):
  • Play/Pause
  • Previous button
  • Following button
  • Title, album, artist metadata
  • Cover
• The player should show the metadata information of the audio file if it exist (if not show a default image and the file name without the extension instead the title of the audio file).
  • Cover
  • Title
  • Album - Artist
• The player should have in memory all the list of audio file of the current folder in order to player the following and back one.
• If there are not more following or back songs the "Previous" or "Following" buttons should appear disabled.
• The first time than the player open a new audio files (metadata not read yet) the player should show the view as an audio file without metadata and then update it with the image, title, album and artist

Mockups:

Figma design:
https://www.figma.com/file/Ui4YzD3oQcxJSbzBEr80O9eU/Working-Draft-UI?node-id=1657%3A2327

[jesmrec]

works for me, nice!