static size_t wdlfileread_read(void *ptr, size_t size, size_t nmemb, void *fr)
{
  WDL_FileRead *_fr=(WDL_FileRead *)fr;
  if (!size||!_fr) return 0;
  size_t v=(size_t) _fr->Read(ptr,size*nmemb);
  return v/size;
}

static int wdlfileread_seek(void *fr, ogg_int64_t offset, int whence)
{
  WDL_FileRead *_fr=(WDL_FileRead *)fr;
  if (whence == SEEK_SET) return _fr->SetPosition(offset)?-1:0;
  if (whence == SEEK_END) return _fr->SetPosition(_fr->GetSize()+offset)?-1:0;
  return _fr->SetPosition(_fr->GetPosition()+offset)?-1:0;
}

static int wdlfileread_close(void *fr) {   delete (WDL_FileRead *)fr;  return fr?0:EOF; }
static long wdlfileread_tell(void *fr) { return (long)((WDL_FileRead *)fr)->GetPosition(); }

ov_callbacks cb={wdlfileread_read,wdlfileread_seek,wdlfileread_close,wdlfileread_tell};