unsigned int subdevices_avail;	union sndrv_pcm_sync_id sync;	/* hardware synchronization ID */	unsigned char reserved[64];	/* reserved for future... */};enum sndrv_pcm_hw_param {	SNDRV_PCM_HW_PARAM_ACCESS = 0,	/* Access type */	SNDRV_PCM_HW_PARAM_FIRST_MASK = SNDRV_PCM_HW_PARAM_ACCESS,	SNDRV_PCM_HW_PARAM_FORMAT,	/* Format */	SNDRV_PCM_HW_PARAM_SUBFORMAT,	/* Subformat */	SNDRV_PCM_HW_PARAM_LAST_MASK = SNDRV_PCM_HW_PARAM_SUBFORMAT,	SNDRV_PCM_HW_PARAM_SAMPLE_BITS = 8, /* Bits per sample */	SNDRV_PCM_HW_PARAM_FIRST_INTERVAL = SNDRV_PCM_HW_PARAM_SAMPLE_BITS,	SNDRV_PCM_HW_PARAM_FRAME_BITS,	/* Bits per frame */	SNDRV_PCM_HW_PARAM_CHANNELS,	/* Channels */	SNDRV_PCM_HW_PARAM_RATE,	/* Approx rate */	SNDRV_PCM_HW_PARAM_PERIOD_TIME,	/* Approx distance between interrupts					   in us */	SNDRV_PCM_HW_PARAM_PERIOD_SIZE,	/* Approx frames between interrupts */	SNDRV_PCM_HW_PARAM_PERIOD_BYTES, /* Approx bytes between interrupts */	SNDRV_PCM_HW_PARAM_PERIODS,	/* Approx interrupts per buffer */	SNDRV_PCM_HW_PARAM_BUFFER_TIME,	/* Approx duration of buffer in us */	SNDRV_PCM_HW_PARAM_BUFFER_SIZE,	/* Size of buffer in frames */	SNDRV_PCM_HW_PARAM_BUFFER_BYTES, /* Size of buffer in bytes */	SNDRV_PCM_HW_PARAM_TICK_TIME,	/* Approx tick duration in us */	SNDRV_PCM_HW_PARAM_LAST_INTERVAL = SNDRV_PCM_HW_PARAM_TICK_TIME};#define SNDRV_PCM_HW_PARAMS_NORESAMPLE	(1<<0)  /* avoid rate resampling */#define SNDRV_PCM_HW_PARAMS_EXPORT_BUFFER	(1<<1)  /* export buffer */struct sndrv_interval {	unsigned int min, max;	unsigned int openmin:1,		     openmax:1,		     integer:1,		     empty:1;};#define SNDRV_MASK_MAX	256struct sndrv_mask {	u_int32_t bits[(SNDRV_MASK_MAX+31)/32];};struct sndrv_pcm_hw_params {	unsigned int flags;	struct sndrv_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 			       SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];	struct sndrv_mask mres[5];	/* reserved masks */	struct sndrv_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -				        SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];	struct sndrv_interval ires[9];	/* reserved intervals */	unsigned int rmask;		/* W: requested masks */	unsigned int cmask;		/* R: changed masks */	unsigned int info;		/* R: Info flags for returned setup */	unsigned int msbits;		/* R: used most significant bits */	unsigned int rate_num;		/* R: rate numerator */	unsigned int rate_den;		/* R: rate denominator */	sndrv_pcm_uframes_t fifo_size;	/* R: chip FIFO size in frames */	unsigned char reserved[64];	/* reserved for future */};enum sndrv_pcm_tstamp {	SNDRV_PCM_TSTAMP_NONE = 0,	SNDRV_PCM_TSTAMP_MMAP,	SNDRV_PCM_TSTAMP_LAST = SNDRV_PCM_TSTAMP_MMAP,};struct sndrv_pcm_sw_params {	int tstamp_mode;			/* timestamp mode */	unsigned int period_step;	unsigned int sleep_min;			/* min ticks to sleep */	sndrv_pcm_uframes_t avail_min;		/* min avail frames for wakeup */	sndrv_pcm_uframes_t xfer_align;		/* xfer size need to be a multiple */	sndrv_pcm_uframes_t start_threshold;	/* min hw_avail frames for automatic start */	sndrv_pcm_uframes_t stop_threshold;	/* min avail frames for automatic stop */	sndrv_pcm_uframes_t silence_threshold;	/* min distance from noise for silence filling */	sndrv_pcm_uframes_t silence_size;	/* silence block size */	sndrv_pcm_uframes_t boundary;		/* pointers wrap point */	unsigned char reserved[64];		/* reserved for future */};struct sndrv_pcm_channel_info {	unsigned int channel;	off_t offset;			/* mmap offset */	unsigned int first;		/* offset to first sample in bits */	unsigned int step;		/* samples distance in bits */};struct sndrv_pcm_status {	int state;			/* stream state */	struct timespec trigger_tstamp;	/* time when stream was started/stopped/paused */	struct timespec tstamp;		/* reference timestamp */	sndrv_pcm_uframes_t appl_ptr;	/* appl ptr */	sndrv_pcm_uframes_t hw_ptr;	/* hw ptr */	sndrv_pcm_sframes_t delay;	/* current delay in frames */	sndrv_pcm_uframes_t avail;	/* number of frames available */	sndrv_pcm_uframes_t avail_max;	/* max frames available on hw since last status */	sndrv_pcm_uframes_t overrange;	/* count of ADC (capture) overrange detections from last status */	int suspended_state;		/* suspended stream state */	unsigned char reserved[60];	/* must be filled with zero */};struct sndrv_pcm_mmap_status {	int state;			/* RO: state - SNDRV_PCM_STATE_XXXX */	int pad1;			/* Needed for 64 bit alignment */	sndrv_pcm_uframes_t hw_ptr;	/* RO: hw ptr (0...boundary-1) */	struct timespec tstamp;		/* Timestamp */	int suspended_state;		/* RO: suspended stream state */};struct sndrv_pcm_mmap_control {	sndrv_pcm_uframes_t appl_ptr;	/* RW: appl ptr (0...boundary-1) */	sndrv_pcm_uframes_t avail_min;	/* RW: min available frames for wakeup */};#define SNDRV_PCM_SYNC_PTR_HWSYNC	(1<<0)	/* execute hwsync */#define SNDRV_PCM_SYNC_PTR_APPL		(1<<1)	/* get appl_ptr from driver (r/w op) */#define SNDRV_PCM_SYNC_PTR_AVAIL_MIN	(1<<2)	/* get avail_min from driver */struct sndrv_pcm_sync_ptr {	unsigned int flags;	union {		struct sndrv_pcm_mmap_status status;		unsigned char reserved[64];	} s;	union {		struct sndrv_pcm_mmap_control control;		unsigned char reserved[64];	} c;};struct sndrv_xferi {	sndrv_pcm_sframes_t result;	void *buf;	sndrv_pcm_uframes_t frames;};struct sndrv_xfern {	sndrv_pcm_sframes_t result;	void **bufs;	sndrv_pcm_uframes_t frames;};enum {	SNDRV_PCM_IOCTL_PVERSION = _IOR('A', 0x00, int),	SNDRV_PCM_IOCTL_INFO = _IOR('A', 0x01, struct sndrv_pcm_info),	SNDRV_PCM_IOCTL_TSTAMP = _IOW('A', 0x02, int),	SNDRV_PCM_IOCTL_HW_REFINE = _IOWR('A', 0x10, struct sndrv_pcm_hw_params),	SNDRV_PCM_IOCTL_HW_PARAMS = _IOWR('A', 0x11, struct sndrv_pcm_hw_params),	SNDRV_PCM_IOCTL_HW_FREE = _IO('A', 0x12),	SNDRV_PCM_IOCTL_SW_PARAMS = _IOWR('A', 0x13, struct sndrv_pcm_sw_params),	SNDRV_PCM_IOCTL_STATUS = _IOR('A', 0x20, struct sndrv_pcm_status),	SNDRV_PCM_IOCTL_DELAY = _IOR('A', 0x21, sndrv_pcm_sframes_t),	SNDRV_PCM_IOCTL_HWSYNC = _IO('A', 0x22),	SNDRV_PCM_IOCTL_SYNC_PTR = _IOWR('A', 0x23, struct sndrv_pcm_sync_ptr),	SNDRV_PCM_IOCTL_CHANNEL_INFO = _IOR('A', 0x32, struct sndrv_pcm_channel_info),	SNDRV_PCM_IOCTL_PREPARE = _IO('A', 0x40),	SNDRV_PCM_IOCTL_RESET = _IO('A', 0x41),	SNDRV_PCM_IOCTL_START = _IO('A', 0x42),	SNDRV_PCM_IOCTL_DROP = _IO('A', 0x43),	SNDRV_PCM_IOCTL_DRAIN = _IO('A', 0x44),	SNDRV_PCM_IOCTL_PAUSE = _IOW('A', 0x45, int),	SNDRV_PCM_IOCTL_REWIND = _IOW('A', 0x46, sndrv_pcm_uframes_t),	SNDRV_PCM_IOCTL_RESUME = _IO('A', 0x47),	SNDRV_PCM_IOCTL_XRUN = _IO('A', 0x48),	SNDRV_PCM_IOCTL_FORWARD = _IOW('A', 0x49, sndrv_pcm_uframes_t),	SNDRV_PCM_IOCTL_WRITEI_FRAMES = _IOW('A', 0x50, struct sndrv_xferi),	SNDRV_PCM_IOCTL_READI_FRAMES = _IOR('A', 0x51, struct sndrv_xferi),	SNDRV_PCM_IOCTL_WRITEN_FRAMES = _IOW('A', 0x52, struct sndrv_xfern),	SNDRV_PCM_IOCTL_READN_FRAMES = _IOR('A', 0x53, struct sndrv_xfern),	SNDRV_PCM_IOCTL_LINK = _IOW('A', 0x60, int),	SNDRV_PCM_IOCTL_UNLINK = _IO('A', 0x61),};/* Trick to make alsa-lib/acinclude.m4 happy */#define SNDRV_PCM_IOCTL_REWIND SNDRV_PCM_IOCTL_REWIND/***************************************************************************** *                                                                           * *                            MIDI v1.0 interface                            * *                                                                           * *****************************************************************************//* *  Raw MIDI section - /dev/snd/midi?? */#define SNDRV_RAWMIDI_VERSION		SNDRV_PROTOCOL_VERSION(2, 0, 0)enum sndrv_rawmidi_stream {	SNDRV_RAWMIDI_STREAM_OUTPUT = 0,	SNDRV_RAWMIDI_STREAM_INPUT,	SNDRV_RAWMIDI_STREAM_LAST = SNDRV_RAWMIDI_STREAM_INPUT,};#define SNDRV_RAWMIDI_INFO_OUTPUT		0x00000001#define SNDRV_RAWMIDI_INFO_INPUT		0x00000002#define SNDRV_RAWMIDI_INFO_DUPLEX		0x00000004struct sndrv_rawmidi_info {	unsigned int device;		/* RO/WR (control): device number */	unsigned int subdevice;		/* RO/WR (control): subdevice number */	int stream;			/* WR: stream */	int card;			/* R: card number */	unsigned int flags;		/* SNDRV_RAWMIDI_INFO_XXXX */	unsigned char id[64];		/* ID (user selectable) */	unsigned char name[80];		/* name of device */	unsigned char subname[32];	/* name of active or selected subdevice */	unsigned int subdevices_count;	unsigned int subdevices_avail;	unsigned char reserved[64];	/* reserved for future use */};struct sndrv_rawmidi_params {	int stream;	size_t buffer_size;		/* queue size in bytes */	size_t avail_min;		/* minimum avail bytes for wakeup */	unsigned int no_active_sensing: 1; /* do not send active sensing byte in close() */	unsigned char reserved[16];	/* reserved for future use */};struct sndrv_rawmidi_status {	int stream;	struct timespec tstamp;		/* Timestamp */	size_t avail;			/* available bytes */	size_t xruns;			/* count of overruns since last status (in bytes) */	unsigned char reserved[16];	/* reserved for future use */};enum {	SNDRV_RAWMIDI_IOCTL_PVERSION = _IOR('W', 0x00, int),	SNDRV_RAWMIDI_IOCTL_INFO = _IOR('W', 0x01, struct sndrv_rawmidi_info),	SNDRV_RAWMIDI_IOCTL_PARAMS = _IOWR('W', 0x10, struct sndrv_rawmidi_params),	SNDRV_RAWMIDI_IOCTL_STATUS = _IOWR('W', 0x20, struct sndrv_rawmidi_status),	SNDRV_RAWMIDI_IOCTL_DROP = _IOW('W', 0x30, int),	SNDRV_RAWMIDI_IOCTL_DRAIN = _IOW('W', 0x31, int),};/* *  Timer section - /dev/snd/timer */#define SNDRV_TIMER_VERSION		SNDRV_PROTOCOL_VERSION(2, 0, 5)enum sndrv_timer_class {	SNDRV_TIMER_CLASS_NONE = -1,	SNDRV_TIMER_CLASS_SLAVE = 0,	SNDRV_TIMER_CLASS_GLOBAL,	SNDRV_TIMER_CLASS_CARD,	SNDRV_TIMER_CLASS_PCM,	SNDRV_TIMER_CLASS_LAST = SNDRV_TIMER_CLASS_PCM,};/* slave timer classes */enum sndrv_timer_slave_class {	SNDRV_TIMER_SCLASS_NONE = 0,	SNDRV_TIMER_SCLASS_APPLICATION,	SNDRV_TIMER_SCLASS_SEQUENCER,		/* alias */	SNDRV_TIMER_SCLASS_OSS_SEQUENCER,	/* alias */	SNDRV_TIMER_SCLASS_LAST = SNDRV_TIMER_SCLASS_OSS_SEQUENCER,};/* global timers (device member) */#define SNDRV_TIMER_GLOBAL_SYSTEM	0#define SNDRV_TIMER_GLOBAL_RTC		1#define SNDRV_TIMER_GLOBAL_HPET		2/* info flags */#define SNDRV_TIMER_FLG_SLAVE		(1<<0)	/* cannot be controlled */struct sndrv_timer_id {	int dev_class;	int dev_sclass;	int card;	int device;	int subdevice;};struct sndrv_timer_ginfo {	struct sndrv_timer_id tid;	/* requested timer ID */	unsigned int flags;		/* timer flags - SNDRV_TIMER_FLG_* */	int card;			/* card number */	unsigned char id[64];		/* timer identification */	unsigned char name[80];		/* timer name */	unsigned long reserved0;	/* reserved for future use */	unsigned long resolution;	/* average period resolution in ns */	unsigned long resolution_min;	/* minimal period resolution in ns */	unsigned long resolution_max;	/* maximal period resolution in ns */	unsigned int clients;		/* active timer clients */	unsigned char reserved[32];};struct sndrv_timer_gparams {	struct sndrv_timer_id tid;	/* requested timer ID */	unsigned long period_num;	/* requested precise period duration (in seconds) - numerator */	unsigned long period_den;	/* requested precise period duration (in seconds) - denominator */	unsigned char reserved[32];};struct sndrv_timer_gstatus {	struct sndrv_timer_id tid;	/* requested timer ID */	unsigned long resolution;	/* current period resolution in ns */	unsigned long resolution_num;	/* precise current period resolution (in seconds) - numerator */	unsigned long resolution_den;	/* precise current period resolution (in seconds) - denominator */	unsigned char reserved[32];};struct sndrv_timer_select {	struct sndrv_timer_id id;	/* bind to timer ID */	unsigned char reserved[32];	/* reserved */};struct sndrv_timer_info {