Preview: usb_stream.h
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/usr/include/sound/usb_stream.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
* Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
*/
#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 */
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