146 lines
5.3 KiB
C
146 lines
5.3 KiB
C
#ifndef __USBAUDIO_CARD_H
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#define __USBAUDIO_CARD_H
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#define MAX_NR_RATES 1024
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#define MAX_PACKS 20
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#define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
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#define MAX_URBS 8
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#define SYNC_URBS 4 /* always four urbs for sync */
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#define MAX_QUEUE 24 /* try not to exceed this queue length, in ms */
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struct audioformat {
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struct list_head list;
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u64 formats; /* ALSA format bits */
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unsigned int channels; /* # channels */
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unsigned int fmt_type; /* USB audio format type (1-3) */
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unsigned int frame_size; /* samples per frame for non-audio */
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int iface; /* interface number */
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unsigned char altsetting; /* corresponding alternate setting */
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unsigned char altset_idx; /* array index of altenate setting */
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unsigned char attributes; /* corresponding attributes of cs endpoint */
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unsigned char endpoint; /* endpoint */
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unsigned char ep_attr; /* endpoint attributes */
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unsigned char datainterval; /* log_2 of data packet interval */
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unsigned int maxpacksize; /* max. packet size */
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unsigned int rates; /* rate bitmasks */
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unsigned int rate_min, rate_max; /* min/max rates */
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unsigned int nr_rates; /* number of rate table entries */
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unsigned int *rate_table; /* rate table */
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unsigned char clock; /* associated clock */
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};
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struct snd_usb_substream;
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struct snd_usb_endpoint;
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struct snd_urb_ctx {
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struct urb *urb;
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unsigned int buffer_size; /* size of data buffer, if data URB */
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struct snd_usb_substream *subs;
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struct snd_usb_endpoint *ep;
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int index; /* index for urb array */
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int packets; /* number of packets per urb */
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int packet_size[MAX_PACKS_HS]; /* size of packets for next submission */
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struct list_head ready_list;
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};
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struct snd_usb_endpoint {
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struct snd_usb_audio *chip;
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int use_count;
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int ep_num; /* the referenced endpoint number */
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int type; /* SND_USB_ENDPOINT_TYPE_* */
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unsigned long flags;
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void (*prepare_data_urb) (struct snd_usb_substream *subs,
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struct urb *urb);
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void (*retire_data_urb) (struct snd_usb_substream *subs,
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struct urb *urb);
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struct snd_usb_substream *data_subs;
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struct snd_usb_endpoint *sync_master;
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struct snd_usb_endpoint *sync_slave;
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struct snd_urb_ctx urb[MAX_URBS];
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struct snd_usb_packet_info {
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uint32_t packet_size[MAX_PACKS_HS];
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int packets;
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} next_packet[MAX_URBS];
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int next_packet_read_pos, next_packet_write_pos;
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struct list_head ready_playback_urbs;
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unsigned int nurbs; /* # urbs */
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unsigned long active_mask; /* bitmask of active urbs */
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unsigned long unlink_mask; /* bitmask of unlinked urbs */
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char *syncbuf; /* sync buffer for all sync URBs */
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dma_addr_t sync_dma; /* DMA address of syncbuf */
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unsigned int pipe; /* the data i/o pipe */
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unsigned int freqn; /* nominal sampling rate in fs/fps in Q16.16 format */
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unsigned int freqm; /* momentary sampling rate in fs/fps in Q16.16 format */
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int freqshift; /* how much to shift the feedback value to get Q16.16 */
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unsigned int freqmax; /* maximum sampling rate, used for buffer management */
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unsigned int phase; /* phase accumulator */
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unsigned int maxpacksize; /* max packet size in bytes */
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unsigned int maxframesize; /* max packet size in frames */
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unsigned int curpacksize; /* current packet size in bytes (for capture) */
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unsigned int curframesize; /* current packet size in frames (for capture) */
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unsigned int syncmaxsize; /* sync endpoint packet size */
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unsigned int fill_max:1; /* fill max packet size always */
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unsigned int datainterval; /* log_2 of data packet interval */
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unsigned int syncinterval; /* P for adaptive mode, 0 otherwise */
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unsigned char silence_value;
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unsigned int stride;
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int iface, alt_idx;
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spinlock_t lock;
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struct list_head list;
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};
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struct snd_usb_substream {
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struct snd_usb_stream *stream;
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struct usb_device *dev;
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struct snd_pcm_substream *pcm_substream;
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int direction; /* playback or capture */
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int interface; /* current interface */
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int endpoint; /* assigned endpoint */
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struct audioformat *cur_audiofmt; /* current audioformat pointer (for hw_params callback) */
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unsigned int cur_rate; /* current rate (for hw_params callback) */
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unsigned int period_bytes; /* current period bytes (for hw_params callback) */
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unsigned int altset_idx; /* USB data format: index of alternate setting */
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unsigned int txfr_quirk:1; /* allow sub-frame alignment */
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unsigned int fmt_type; /* USB audio format type (1-3) */
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unsigned int running: 1; /* running status */
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unsigned int hwptr_done; /* processed byte position in the buffer */
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unsigned int transfer_done; /* processed frames since last period update */
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unsigned long active_mask; /* bitmask of active urbs */
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unsigned long unlink_mask; /* bitmask of unlinked urbs */
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/* data and sync endpoints for this stream */
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struct snd_usb_endpoint *data_endpoint;
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struct snd_usb_endpoint *sync_endpoint;
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unsigned long flags;
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u64 formats; /* format bitmasks (all or'ed) */
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unsigned int num_formats; /* number of supported audio formats (list) */
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struct list_head fmt_list; /* format list */
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struct snd_pcm_hw_constraint_list rate_list; /* limited rates */
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spinlock_t lock;
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int last_frame_number; /* stored frame number */
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int last_delay; /* stored delay */
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};
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struct snd_usb_stream {
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struct snd_usb_audio *chip;
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struct snd_pcm *pcm;
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int pcm_index;
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unsigned int fmt_type; /* USB audio format type (1-3) */
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struct snd_usb_substream substream[2];
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struct list_head list;
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};
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#endif /* __USBAUDIO_CARD_H */
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