source: contrib/API/tools/unimix.h

#define SIZE_DEVICE_NAME            32

typedef struct sndrv_ctl_card_info {
  int card;     /* card number */
  int pad;      /* reserved for future (was type) */
  unsigned char id[16];   /* ID of card (user selectable) */
  unsigned char driver[16]; /* Driver name */
  unsigned char name[32];   /* Short name of soundcard */
  unsigned char longname[80]; /* name + info text about soundcard */
  unsigned char reserved_[16];  /* reserved for future (was ID of mixer) */
  unsigned char mixername[80];  /* visual mixer identification */
  unsigned char components[80]; /* card components / fine identification, delimited with one space (AC97 etc..) */
  unsigned char reserved[48]; /* reserved for future */
} UniaudCardInfo;

enum sndrv_ctl_elem_iface {
        SNDRV_CTL_ELEM_IFACE_CARD = 0,          /* global control */
        SNDRV_CTL_ELEM_IFACE_HWDEP,             /* hardware dependent device */
        SNDRV_CTL_ELEM_IFACE_MIXER,             /* virtual mixer device */
        SNDRV_CTL_ELEM_IFACE_PCM,               /* PCM device */
        SNDRV_CTL_ELEM_IFACE_RAWMIDI,           /* RawMidi device */
        SNDRV_CTL_ELEM_IFACE_TIMER,             /* timer device */
        SNDRV_CTL_ELEM_IFACE_SEQUENCER,         /* sequencer client */
        SNDRV_CTL_ELEM_IFACE_LAST = SNDRV_CTL_ELEM_IFACE_SEQUENCER,
};

typedef struct sndrv_ctl_elem_id {
        unsigned int numid;             /* numeric identifier, zero = invalid */
        enum sndrv_ctl_elem_iface iface; /* interface identifier */
        unsigned int device;            /* device/client number */
        unsigned int subdevice;         /* subdevice (substream) number */
        unsigned char name[44];         /* ASCII name of item */
        unsigned int index;             /* index of item */
} UniaudControl;

enum sndrv_ctl_elem_type {
  SNDRV_CTL_ELEM_TYPE_NONE = 0,   /* invalid */
  SNDRV_CTL_ELEM_TYPE_BOOLEAN,    /* boolean type */
  SNDRV_CTL_ELEM_TYPE_INTEGER,    /* integer type */
  SNDRV_CTL_ELEM_TYPE_ENUMERATED,   /* enumerated type */
  SNDRV_CTL_ELEM_TYPE_BYTES,    /* byte array */
  SNDRV_CTL_ELEM_TYPE_IEC958,   /* IEC958 (S/PDIF) setup */
  SNDRV_CTL_ELEM_TYPE_INTEGER64,    /* 64-bit integer type */
  SNDRV_CTL_ELEM_TYPE_LAST = SNDRV_CTL_ELEM_TYPE_INTEGER64,
};

typedef struct sndrv_ctl_elem_info {
  UniaudControl id; /* W: element ID */
  enum sndrv_ctl_elem_type type;  /* R: value type - SNDRV_CTL_ELEM_TYPE_* */
  unsigned int access;    /* R: value access (bitmask) - SNDRV_CTL_ELEM_ACCESS_* */
  unsigned int count;   /* count of values */
  int owner;      /* owner's PID of this control */
  union {
    struct {
      long min;   /* R: minimum value */
      long max;   /* R: maximum value */
      long step;    /* R: step (0 variable) */
    } integer;
    struct {
      long long min;    /* R: minimum value */
      long long max;    /* R: maximum value */
      long long step;   /* R: step (0 variable) */
    } integer64;
    struct {
      unsigned int items; /* R: number of items */
      unsigned int item;  /* W: item number */
      char name[64];    /* R: value name */
    } enumerated;
    unsigned char reserved[128];
  } value;
  union {
    unsigned short d[4];    /* dimensions */
    unsigned short *d_ptr;    /* indirect */
  } dimen;
  unsigned char reserved[64-4*sizeof(unsigned short)];
} UniaudControlInfo;

struct sndrv_aes_iec958 {
        unsigned char status[24];       /* AES/IEC958 channel status bits */
        unsigned char subcode[147];     /* AES/IEC958 subcode bits */
        unsigned char pad;              /* nothing */
        unsigned char dig_subframe[4];  /* AES/IEC958 subframe bits */
};

struct timespec {
        long    tv_sec;         /* seconds */
        long    tv_usec;        /* and microseconds */
};

typedef struct sndrv_ctl_elem_value {
  UniaudControl id; /* W: element ID */
  unsigned int indirect: 1; /* W: use indirect pointer (xxx_ptr member) */
        union {
    union {
      long value[128];
      long *value_ptr;
    } integer;
    union {
      long long value[64];
      long long *value_ptr;
    } integer64;
    union {
      unsigned int item[128];
      unsigned int *item_ptr;
    } enumerated;
    union {
      unsigned char data[512];
      unsigned char *data_ptr;
    } bytes;
    struct sndrv_aes_iec958 iec958;
        } value;                /* RO */
  struct timespec tstamp;
        unsigned char reserved[128-sizeof(struct timespec)];
} UniaudControlValue;

typedef struct DumpFileHeader {
    char ID[10]; // "UNIMIXDUMP"
    unsigned char driver[16]; /* Driver name */
    int controls; // number of controls
} DumpFileHeader;

typedef struct {
    ULONG  nrStreams;            //nr of activate wave streams supported
    ULONG  ulMinChannels;        //min nr of channels
    ULONG  ulMaxChannels;        //max nr of channels
    ULONG  ulChanFlags;          //channel flags
    ULONG  ulMinRate;            //min sample rate
    ULONG  ulMaxRate;            //max sample rate
    ULONG  ulRateFlags;          //sample rate flags
    ULONG  ulDataFormats;        //supported wave formats
} WAVE_CAPS, *PWAVE_CAPS, FAR *LPWAVE_CAPS;

typedef struct {
    ULONG     nrDevices;                   //total nr of audio devices
    ULONG     ulCaps;                  //device caps
    char      szDeviceName[SIZE_DEVICE_NAME];
    char      szMixerName[SIZE_DEVICE_NAME];
    WAVE_CAPS waveOutCaps;
    WAVE_CAPS waveInCaps;
} OSS32_DEVCAPS, *POSS32_DEVCAPS, FAR *LPOSS32_DEVCAPS;