#ifndef __USBAUDIO_CARD_H
  #define __USBAUDIO_CARD_H
  
  #define MAX_NR_RATES	1024
  #define MAX_PACKS	6		/* per URB */
  #define MAX_PACKS_HS	(MAX_PACKS * 8)	/* in high speed mode */
  #define MAX_URBS	12
  #define SYNC_URBS	4	/* always four urbs for sync */
  #define MAX_QUEUE	18	/* try not to exceed this queue length, in ms */
  
  struct audioformat {
  	struct list_head list;
  	u64 formats;			/* ALSA format bits */
  	unsigned int channels;		/* # channels */
  	unsigned int fmt_type;		/* USB audio format type (1-3) */
  	unsigned int frame_size;	/* samples per frame for non-audio */
  	int iface;			/* interface number */
  	unsigned char altsetting;	/* corresponding alternate setting */
  	unsigned char altset_idx;	/* array index of altenate setting */
  	unsigned char attributes;	/* corresponding attributes of cs endpoint */
  	unsigned char endpoint;		/* endpoint */
  	unsigned char ep_attr;		/* endpoint attributes */
  	unsigned char datainterval;	/* log_2 of data packet interval */
  	unsigned char protocol;		/* UAC_VERSION_1/2 */
  	unsigned int maxpacksize;	/* max. packet size */
  	unsigned int rates;		/* rate bitmasks */
  	unsigned int rate_min, rate_max;	/* min/max rates */
  	unsigned int nr_rates;		/* number of rate table entries */
  	unsigned int *rate_table;	/* rate table */
  	unsigned char clock;		/* associated clock */
  	struct snd_pcm_chmap_elem *chmap; /* (optional) channel map */
  	bool dsd_dop;			/* add DOP headers in case of DSD samples */
  	bool dsd_bitrev;		/* reverse the bits of each DSD sample */
  };
  
  struct snd_usb_substream;
  struct snd_usb_endpoint;
  
  struct snd_urb_ctx {
  	struct urb *urb;
  	unsigned int buffer_size;	/* size of data buffer, if data URB */
  	struct snd_usb_substream *subs;
  	struct snd_usb_endpoint *ep;
  	int index;	/* index for urb array */
  	int packets;	/* number of packets per urb */
  	int packet_size[MAX_PACKS_HS]; /* size of packets for next submission */
  	struct list_head ready_list;
  };
  
  struct snd_usb_endpoint {
  	struct snd_usb_audio *chip;
  
  	int use_count;
  	int ep_num;		/* the referenced endpoint number */
  	int type;		/* SND_USB_ENDPOINT_TYPE_* */
  	unsigned long flags;
  
  	void (*prepare_data_urb) (struct snd_usb_substream *subs,
  				  struct urb *urb);
  	void (*retire_data_urb) (struct snd_usb_substream *subs,
  				 struct urb *urb);
  
  	struct snd_usb_substream *data_subs;
  	struct snd_usb_endpoint *sync_master;
  	struct snd_usb_endpoint *sync_slave;
  
  	struct snd_urb_ctx urb[MAX_URBS];
  
  	struct snd_usb_packet_info {
  		uint32_t packet_size[MAX_PACKS_HS];
  		int packets;
  	} next_packet[MAX_URBS];
  	int next_packet_read_pos, next_packet_write_pos;
  	struct list_head ready_playback_urbs;
  
  	unsigned int nurbs;		/* # urbs */
  	unsigned long active_mask;	/* bitmask of active urbs */
  	unsigned long unlink_mask;	/* bitmask of unlinked urbs */
  	char *syncbuf;			/* sync buffer for all sync URBs */
  	dma_addr_t sync_dma;		/* DMA address of syncbuf */
  
  	unsigned int pipe;		/* the data i/o pipe */
  	unsigned int freqn;		/* nominal sampling rate in fs/fps in Q16.16 format */
  	unsigned int freqm;		/* momentary sampling rate in fs/fps in Q16.16 format */
  	int	   freqshift;		/* how much to shift the feedback value to get Q16.16 */
  	unsigned int freqmax;		/* maximum sampling rate, used for buffer management */
  	unsigned int phase;		/* phase accumulator */
  	unsigned int maxpacksize;	/* max packet size in bytes */
  	unsigned int maxframesize;      /* max packet size in frames */
  	unsigned int max_urb_frames;	/* max URB size in frames */
  	unsigned int curpacksize;	/* current packet size in bytes (for capture) */
  	unsigned int curframesize;      /* current packet size in frames (for capture) */
  	unsigned int syncmaxsize;	/* sync endpoint packet size */
  	unsigned int fill_max:1;	/* fill max packet size always */
  	unsigned int udh01_fb_quirk:1;	/* corrupted feedback data */
  	unsigned int datainterval;      /* log_2 of data packet interval */
  	unsigned int syncinterval;	/* P for adaptive mode, 0 otherwise */
  	unsigned char silence_value;
  	unsigned int stride;
  	int iface, altsetting;
  	int skip_packets;		/* quirks for devices to ignore the first n packets
  					   in a stream */
  
  	spinlock_t lock;
  	struct list_head list;
  };
  
  struct snd_usb_substream {
  	struct snd_usb_stream *stream;
  	struct usb_device *dev;
  	struct snd_pcm_substream *pcm_substream;
  	int direction;	/* playback or capture */
  	int interface;	/* current interface */
  	int endpoint;	/* assigned endpoint */
  	struct audioformat *cur_audiofmt;	/* current audioformat pointer (for hw_params callback) */
  	snd_pcm_format_t pcm_format;	/* current audio format (for hw_params callback) */
  	unsigned int channels;		/* current number of channels (for hw_params callback) */
  	unsigned int channels_max;	/* max channels in the all audiofmts */
  	unsigned int cur_rate;		/* current rate (for hw_params callback) */
  	unsigned int period_bytes;	/* current period bytes (for hw_params callback) */
  	unsigned int period_frames;	/* current frames per period */
  	unsigned int buffer_periods;	/* current periods per buffer */
  	unsigned int altset_idx;     /* USB data format: index of alternate setting */
  	unsigned int txfr_quirk:1;	/* allow sub-frame alignment */
  	unsigned int fmt_type;		/* USB audio format type (1-3) */
  	unsigned int pkt_offset_adj;	/* Bytes to drop from beginning of packets (for non-compliant devices) */
  
  	unsigned int running: 1;	/* running status */
  
  	unsigned int hwptr_done;	/* processed byte position in the buffer */
  	unsigned int transfer_done;		/* processed frames since last period update */
  	unsigned int frame_limit;	/* limits number of packets in URB */
  
  	/* data and sync endpoints for this stream */
  	unsigned int ep_num;		/* the endpoint number */
  	struct snd_usb_endpoint *data_endpoint;
  	struct snd_usb_endpoint *sync_endpoint;
  	unsigned long flags;
  	bool need_setup_ep;		/* (re)configure EP at prepare? */
  	unsigned int speed;		/* USB_SPEED_XXX */
  
  	u64 formats;			/* format bitmasks (all or'ed) */
  	unsigned int num_formats;		/* number of supported audio formats (list) */
  	struct list_head fmt_list;	/* format list */
  	struct snd_pcm_hw_constraint_list rate_list;	/* limited rates */
  	spinlock_t lock;
  
  	int last_frame_number;          /* stored frame number */
  	int last_delay;                 /* stored delay */
  
  	struct {
  		int marker;
  		int channel;
  		int byte_idx;
  	} dsd_dop;
  };
  
  struct snd_usb_stream {
  	struct snd_usb_audio *chip;
  	struct snd_pcm *pcm;
  	int pcm_index;
  	unsigned int fmt_type;		/* USB audio format type (1-3) */
  	struct snd_usb_substream substream[2];
  	struct list_head list;
  };
  
  #endif /* __USBAUDIO_CARD_H */