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Current File : /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>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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[0];
};

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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