linux/drivers/media/pci/cx18/cx18-vbi.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  cx18 Vertical Blank Interval support functions
 *
 *  Derived from ivtv-vbi.c
 *
 *  Copyright (C) 2007  Hans Verkuil <[email protected]>
 */

#include "cx18-driver.h"
#include "cx18-vbi.h"
#include "cx18-ioctl.h"
#include "cx18-queue.h"

/*
 * Raster Reference/Protection (RP) bytes, used in Start/End Active
 * Video codes emitted from the digitzer in VIP 1.x mode, that flag the start
 * of VBI sample or VBI ancillary data regions in the digital ratser line.
 *
 * Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0
 */
static const u8 raw_vbi_sav_rp[2] = …;    /* __V_, _FV_ */
static const u8 sliced_vbi_eav_rp[2] = …; /* T_VH, TFVH */

static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)
{ … }

/* Compress raw VBI format, removes leading SAV codes and surplus space
   after the frame.  Returns new compressed size. */
/* FIXME - this function ignores the input size. */
static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size)
{ … }

static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size,
			       const u32 hdr_size)
{ … }

static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf)
{ … }

void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl,
			   int streamtype)
{ … }