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committed fdbeb962581x
int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int non_blocking);/* * SPDX-License-Identifier: GPL-2.0 * * dvb-vb2.h - DVB driver helper framework for streaming I/O * * Copyright (C) 2015 Samsung Electronics * * Author: jh1009.sung@samsung.com * * 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. *//** * enum dvb_buf_type - types of Digital TV memory-mapped buffers * * @DVB_BUF_TYPE_CAPTURE: buffer is filled by the Kernel, * with a received Digital TV stream */enum dvb_buf_type { DVB_BUF_TYPE_CAPTURE = 1,};/** * enum dvb_vb2_states - states to control VB2 state machine * @DVB_VB2_STATE_NONE: * VB2 engine not initialized yet, init failed or VB2 was released. * @DVB_VB2_STATE_INIT: * VB2 engine initialized. * @DVB_VB2_STATE_REQBUFS: * Buffers were requested * @DVB_VB2_STATE_STREAMON: * VB2 is streaming. Callers should not check it directly. Instead, * they should use dvb_vb2_is_streaming(). * * Note: * * Callers should not touch at the state machine directly. This * is handled inside dvb_vb2.c. */enum dvb_vb2_states { DVB_VB2_STATE_NONE = 0x0, DVB_VB2_STATE_INIT = 0x1, DVB_VB2_STATE_REQBUFS = 0x2, DVB_VB2_STATE_STREAMON = 0x4,};/** * struct dvb_buffer - video buffer information for v4l2. * * @vb: embedded struct &vb2_buffer. * @list: list of &struct dvb_buffer. */struct dvb_buffer { struct vb2_buffer vb; struct list_head list;};/** * struct dvb_vb2_ctx - control struct for VB2 handler * @vb_q: pointer to &struct vb2_queue with videobuf2 queue. * @mutex: mutex to serialize vb2 operations. Used by * vb2 core %wait_prepare and %wait_finish operations. * @slock: spin lock used to protect buffer filling at dvb_vb2.c. * @dvb_q: List of buffers that are not filled yet. * @buf: Pointer to the buffer that are currently being filled. * @offset: index to the next position at the @buf to be filled. * @remain: How many bytes are left to be filled at @buf. * @state: bitmask of buffer states as defined by &enum dvb_vb2_states. * @buf_siz: size of each VB2 buffer. * @buf_cnt: number of VB2 buffers. * @nonblocking: * If different than zero, device is operating on non-blocking * mode. * @flags: buffer flags as defined by &enum dmx_buffer_flags. * Filled only at &DMX_DQBUF. &DMX_QBUF should zero this field. * @count: monotonic counter for filled buffers. Helps to identify * data stream loses. Filled only at &DMX_DQBUF. &DMX_QBUF should * zero this field.