ffmpeg extension amr file

[shoyu666]

dear author:
we want player .amr file ,but not support ,so we build ffmpeg extension , and build success
is any ffmpeg extension exmple ?

  we use
  EXTENSION_RENDERER_MODE_PREFER 
  ExtractorMediaSource(Uri.pares("xxx.amr"))

  get exception
   None of the available extractors (MatroskaExtractor, FragmentedMp4Extractor, Mp4Extractor, Mp3Extractor, AdtsExtractor, Ac3Extractor, TsExtractor, FlvExtractor, OggExtractor, PsExtractor, WavExtractor) could read the stream.   

  my question is how to use ffmpeg   extension 

  we have see other extension test case  but no idea

[andrewlewis]

Adding support for extraction of AMR containers is tracked by #2527. (If you've built FFmpeg with AMR decoding you should be able to play AMR tracks embedded MP4s already, though.)