/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * Copyright (C) 2007, 2008 Karsten Wiese <[email protected]>
 */

#ifndef __SOUND_USB_STREAM_H
#define __SOUND_USB_STREAM_H

#define USB_STREAM_INTERFACE_VERSION 2

#define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \
    _IOW('H', 0x90, struct usb_stream_config)

struct usb_stream_packet {
    unsigned offset;
    unsigned length;
};


struct usb_stream_config {
    unsigned version;
    unsigned sample_rate;
    unsigned period_frames;
    unsigned frame_size;
};

struct usb_stream {
    struct usb_stream_config cfg;
    unsigned read_size;
    unsigned write_size;

    int period_size;

    unsigned state;

    int idle_insize;
    int idle_outsize;
    int sync_packet;
    unsigned insize_done;
    unsigned periods_done;
    unsigned periods_polled;

    struct usb_stream_packet outpacket[2];
    unsigned         inpackets;
    unsigned         inpacket_head;
    unsigned         inpacket_split;
    unsigned         inpacket_split_at;
    unsigned         next_inpacket_split;
    unsigned         next_inpacket_split_at;
    struct usb_stream_packet inpacket[];
};

enum usb_stream_state {
    usb_stream_invalid,
    usb_stream_stopped,
    usb_stream_sync0,
    usb_stream_sync1,
    usb_stream_ready,
    usb_stream_running,
    usb_stream_xrun,
};

#endif /* __SOUND_USB_STREAM_H */