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extern void dvb_ringbuffer_pkt_dispose(struct dvb_ringbuffer *rbuf, size_t idx);/* * * dvb_ringbuffer.h: ring buffer implementation for the dvb driver * * Copyright (C) 2003 Oliver Endriss * Copyright (C) 2004 Andrew de Quincey * * based on code originally found in av7110.c & dvb_ci.c: * Copyright (C) 1999-2003 Ralph Metzler & Marcus Metzler * for convergence integrated media GmbH * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2.1 * 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 Lesser General Public License for more details. *//** * struct dvb_ringbuffer - Describes a ring buffer used at DVB framework * * @data: Area were the ringbuffer data is written * @size: size of the ringbuffer * @pread: next position to read * @pwrite: next position to write * @error: used by ringbuffer clients to indicate that an error happened. * @queue: Wait queue used by ringbuffer clients to indicate when buffer * was filled * @lock: Spinlock used to protect the ringbuffer */struct dvb_ringbuffer { u8 *data; ssize_t size; ssize_t pread; ssize_t pwrite; int error; wait_queue_head_t queue; spinlock_t lock;};/** * dvb_ringbuffer_init - initialize ring buffer, lock and queue * * @rbuf: pointer to struct dvb_ringbuffer * @data: pointer to the buffer where the data will be stored * @len: bytes from ring buffer into @buf */extern void dvb_ringbuffer_init(struct dvb_ringbuffer *rbuf, void *data, size_t len);/** * dvb_ringbuffer_empty - test whether buffer is empty * * @rbuf: pointer to struct dvb_ringbuffer */extern int dvb_ringbuffer_empty(struct dvb_ringbuffer *rbuf);/** * dvb_ringbuffer_free - returns the number of free bytes in the buffer * * @rbuf: pointer to struct dvb_ringbuffer * * Return: number of free bytes in the buffer */extern ssize_t dvb_ringbuffer_free(struct dvb_ringbuffer *rbuf);/** * dvb_ringbuffer_avail - returns the number of bytes waiting in the buffer * * @rbuf: pointer to struct dvb_ringbuffer * * Return: number of bytes waiting in the buffer */extern ssize_t dvb_ringbuffer_avail(struct dvb_ringbuffer *rbuf);/** * dvb_ringbuffer_reset - resets the ringbuffer to initial state * * @rbuf: pointer to struct dvb_ringbuffer