// 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] = { 0x20, 0x60 }; /* __V_, _FV_ */
static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */
static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)
{
int line = 0;
int i;
u32 linemask[2] = { 0, 0 };
unsigned short size;
static const u8 mpeg_hdr_data[] = {
/* MPEG-2 Program Pack */
0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */
0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */
0x01, 0xd1, 0xd3, /* Mux Rate, markers */
0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */
/* MPEG-2 Private Stream 1 PES Packet */
0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */
0x00, 0x1a, /* length */
0x84, 0x80, 0x07, /* flags, hdr data len */
0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */
0xff, 0xff /* stuffing */
};
const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */
int idx = cx->vbi.frame % CX18_VBI_FRAMES;
u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0];
for (i = 0; i < lines; i++) {
struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i;
int f, l;
if (sdata->id == 0)
continue;
l = sdata->line - 6;
f = sdata->field;
if (f)
l += 18;
if (l < 32)
linemask[0] |= (1 << l);
else
linemask[1] |= (1 << (l - 32));
dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id);
memcpy(dst + sd + 12 + line * 43 + 1, sdata->data, 42);
line++;
}
memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));
if (line == 36) {
/* All lines are used, so there is no space for the linemask
(the max size of the VBI data is 36 * 43 + 4 bytes).
So in this case we use the magic number 'ITV0'. */
memcpy(dst + sd, "ITV0", 4);
memmove(dst + sd + 4, dst + sd + 12, line * 43);
size = 4 + ((43 * line + 3) & ~3);
} else {
memcpy(dst + sd, "itv0", 4);
cpu_to_le32s(&linemask[0]);
cpu_to_le32s(&linemask[1]);
memcpy(dst + sd + 4, &linemask[0], 8);
size = 12 + ((43 * line + 3) & ~3);
}
dst[4+16] = (size + 10) >> 8;
dst[5+16] = (size + 10) & 0xff;
dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6);
dst[10+16] = (pts_stamp >> 22) & 0xff;
dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff);
dst[12+16] = (pts_stamp >> 7) & 0xff;
dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1);
cx->vbi.sliced_mpeg_size[idx] = sd + size;
}
/* 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)
{
u32 line_size = VBI_ACTIVE_SAMPLES;
u32 lines = cx->vbi.count * 2;
u8 *q = buf;
u8 *p;
int i;
/* Skip the header */
buf += hdr_size;
for (i = 0; i < lines; i++) {
p = buf + i * line_size;
/* Look for SAV code */
if (p[0] != 0xff || p[1] || p[2] ||
(p[3] != raw_vbi_sav_rp[0] &&
p[3] != raw_vbi_sav_rp[1]))
break;
if (i == lines - 1) {
/* last line is hdr_size bytes short - extrapolate it */
memcpy(q, p + 4, line_size - 4 - hdr_size);
q += line_size - 4 - hdr_size;
p += line_size - hdr_size - 1;
memset(q, (int) *p, hdr_size);
} else {
memcpy(q, p + 4, line_size - 4);
q += line_size - 4;
}
}
return lines * (line_size - 4);
}
static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size,
const u32 hdr_size)
{
struct v4l2_decode_vbi_line vbi;
int i;
u32 line = 0;
u32 line_size = cx->is_60hz ? VBI_HBLANK_SAMPLES_60HZ
: VBI_HBLANK_SAMPLES_50HZ;
/* find the first valid line */
for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) {
if (buf[0] == 0xff && !buf[1] && !buf[2] &&
(buf[3] == sliced_vbi_eav_rp[0] ||
buf[3] == sliced_vbi_eav_rp[1]))
break;
}
/*
* The last line is short by hdr_size bytes, but for the remaining
* checks against size, we pretend that it is not, by counting the
* header bytes we knowingly skipped
*/
size -= (i - hdr_size);
if (size < line_size)
return line;
for (i = 0; i < size / line_size; i++) {
u8 *p = buf + i * line_size;
/* Look for EAV code */
if (p[0] != 0xff || p[1] || p[2] ||
(p[3] != sliced_vbi_eav_rp[0] &&
p[3] != sliced_vbi_eav_rp[1]))
continue;
vbi.p = p + 4;
v4l2_subdev_call(cx->sd_av, vbi, decode_vbi_line, &vbi);
if (vbi.type) {
cx->vbi.sliced_data[line].id = vbi.type;
cx->vbi.sliced_data[line].field = vbi.is_second_field;
cx->vbi.sliced_data[line].line = vbi.line;
memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42);
line++;
}
}
return line;
}
static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf)
{
/*
* The CX23418 provides a 12 byte header in its raw VBI buffers to us:
* 0x3fffffff [4 bytes of something] [4 byte presentation time stamp]
*/
struct vbi_data_hdr {
__be32 magic;
__be32 unknown;
__be32 pts;
} *hdr = (struct vbi_data_hdr *) buf->buf;
u8 *p = (u8 *) buf->buf;
u32 size = buf->bytesused;
u32 pts;
int lines;
/*
* The CX23418 sends us data that is 32 bit little-endian swapped,
* but we want the raw VBI bytes in the order they were in the raster
* line. This has a side effect of making the header big endian
*/
cx18_buf_swap(buf);
/* Raw VBI data */
if (cx18_raw_vbi(cx)) {
size = buf->bytesused =
compress_raw_buf(cx, p, size, sizeof(struct vbi_data_hdr));
/*
* Hack needed for compatibility with old VBI software.
* Write the frame # at the last 4 bytes of the frame
*/
p += size - 4;
memcpy(p, &cx->vbi.frame, 4);
cx->vbi.frame++;
return;
}
/* Sliced VBI data with data insertion */
pts = (be32_to_cpu(hdr->magic) == 0x3fffffff) ? be32_to_cpu(hdr->pts)
: 0;
lines = compress_sliced_buf(cx, p, size, sizeof(struct vbi_data_hdr));
/* always return at least one empty line */
if (lines == 0) {
cx->vbi.sliced_data[0].id = 0;
cx->vbi.sliced_data[0].line = 0;
cx->vbi.sliced_data[0].field = 0;
lines = 1;
}
buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]);
memcpy(p, &cx->vbi.sliced_data[0], size);
if (cx->vbi.insert_mpeg)
copy_vbi_data(cx, lines, pts);
cx->vbi.frame++;
}
void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl,
int streamtype)
{
struct cx18_buffer *buf;
u32 orig_used;
if (streamtype != CX18_ENC_STREAM_TYPE_VBI)
return;
/*
* Big assumption here:
* Every buffer hooked to the MDL's buf_list is a complete VBI frame
* that ends at the end of the buffer.
*
* To assume anything else would make the code in this file
* more complex, or require extra memcpy()'s to make the
* buffers satisfy the above assumption. It's just simpler to set
* up the encoder buffer transfers to make the assumption true.
*/
list_for_each_entry(buf, &mdl->buf_list, list) {
orig_used = buf->bytesused;
if (orig_used == 0)
break;
_cx18_process_vbi_data(cx, buf);
mdl->bytesused -= (orig_used - buf->bytesused);
}
}
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