#ifndef __USBAUDIO_PCM_H
  #define __USBAUDIO_PCM_H
  
  snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  				    unsigned int rate);
  
  void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream);
  
  int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
  		       struct usb_host_interface *alts,
  		       struct audioformat *fmt);
  
  
  #endif /* __USBAUDIO_PCM_H */