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linux-kernel-test/drivers/media/video/ivtv/ivtv-vbi.c
Hans Verkuil 2f3a98931f V4L/DVB (6116): ivtv: VBI cleanups and fixes 
Besides some VBI cleanups this patch also fixes a subtle problem with the
VBI re-insertion stream where the PIO work handler wasn't called quickly
enough, resulting in occasional corrupt data.

Furthermore the CC output didn't disable CC correctly and at the right time,
causing duplicates to be sent.

An saa7127 fix for VPS output was also added: the wrong data was sent.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2007-10-09 22:07:14 -03:00

501 lines
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/*
Vertical Blank Interval support functions
Copyright (C) 2004-2007 Hans Verkuil <hverkuil@xs4all.nl>
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "ivtv-driver.h"
#include "ivtv-i2c.h"
#include "ivtv-ioctl.h"
#include "ivtv-queue.h"
#include "ivtv-vbi.h"
static void ivtv_set_vps(struct ivtv *itv, int enabled)
{
struct v4l2_sliced_vbi_data data;
if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
return;
data.id = V4L2_SLICED_VPS;
data.field = 0;
data.line = enabled ? 16 : 0;
data.data[2] = itv->vbi.vps_payload.data[0];
data.data[8] = itv->vbi.vps_payload.data[1];
data.data[9] = itv->vbi.vps_payload.data[2];
data.data[10] = itv->vbi.vps_payload.data[3];
data.data[11] = itv->vbi.vps_payload.data[4];
ivtv_saa7127(itv, VIDIOC_INT_S_VBI_DATA, &data);
}
static void ivtv_set_cc(struct ivtv *itv, int mode, const struct vbi_cc *cc)
{
struct v4l2_sliced_vbi_data data;
if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
return;
data.id = V4L2_SLICED_CAPTION_525;
data.field = 0;
data.line = (mode & 1) ? 21 : 0;
data.data[0] = cc->odd[0];
data.data[1] = cc->odd[1];
ivtv_saa7127(itv, VIDIOC_INT_S_VBI_DATA, &data);
data.field = 1;
data.line = (mode & 2) ? 21 : 0;
data.data[0] = cc->even[0];
data.data[1] = cc->even[1];
ivtv_saa7127(itv, VIDIOC_INT_S_VBI_DATA, &data);
}
static void ivtv_set_wss(struct ivtv *itv, int enabled, int mode)
{
struct v4l2_sliced_vbi_data data;
if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
return;
/* When using a 50 Hz system, always turn on the
wide screen signal with 4x3 ratio as the default.
Turning this signal on and off can confuse certain
TVs. As far as I can tell there is no reason not to
transmit this signal. */
if ((itv->std & V4L2_STD_625_50) && !enabled) {
enabled = 1;
mode = 0x08; /* 4x3 full format */
}
data.id = V4L2_SLICED_WSS_625;
data.field = 0;
data.line = enabled ? 23 : 0;
data.data[0] = mode & 0xff;
data.data[1] = (mode >> 8) & 0xff;
ivtv_saa7127(itv, VIDIOC_INT_S_VBI_DATA, &data);
}
static int odd_parity(u8 c)
{
c ^= (c >> 4);
c ^= (c >> 2);
c ^= (c >> 1);
return c & 1;
}
void ivtv_write_vbi(struct ivtv *itv, const struct v4l2_sliced_vbi_data *sliced, size_t cnt)
{
struct vbi_info *vi = &itv->vbi;
struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
int found_cc = 0;
size_t i;
for (i = 0; i < cnt; i++) {
const struct v4l2_sliced_vbi_data *d = sliced + i;
if (d->id == V4L2_SLICED_CAPTION_525 && d->line == 21) {
if (d->field) {
cc.even[0] = d->data[0];
cc.even[1] = d->data[1];
} else {
cc.odd[0] = d->data[0];
cc.odd[1] = d->data[1];
}
found_cc = 1;
}
else if (d->id == V4L2_SLICED_VPS && d->line == 16 && d->field == 0) {
struct vbi_vps vps;
vps.data[0] = d->data[2];
vps.data[1] = d->data[8];
vps.data[2] = d->data[9];
vps.data[3] = d->data[10];
vps.data[4] = d->data[11];
if (memcmp(&vps, &vi->vps_payload, sizeof(vps))) {
vi->vps_payload = vps;
set_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags);
}
}
else if (d->id == V4L2_SLICED_WSS_625 && d->line == 23 && d->field == 0) {
int wss = d->data[0] | d->data[1] << 8;
if (vi->wss_payload != wss) {
vi->wss_payload = wss;
set_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags);
}
}
}
if (found_cc && vi->cc_payload_idx < sizeof(vi->cc_payload)) {
vi->cc_payload[vi->cc_payload_idx++] = cc;
set_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
}
}
static void copy_vbi_data(struct ivtv *itv, int lines, u32 pts_stamp)
{
int line = 0;
int i;
u32 linemask[2] = { 0, 0 };
unsigned short size;
static const u8 mpeg_hdr_data[] = {
0x00, 0x00, 0x01, 0xba, 0x44, 0x00, 0x0c, 0x66,
0x24, 0x01, 0x01, 0xd1, 0xd3, 0xfa, 0xff, 0xff,
0x00, 0x00, 0x01, 0xbd, 0x00, 0x1a, 0x84, 0x80,
0x07, 0x21, 0x00, 0x5d, 0x63, 0xa7, 0xff, 0xff
};
const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */
int idx = itv->vbi.frame % IVTV_VBI_FRAMES;
u8 *dst = &itv->vbi.sliced_mpeg_data[idx][0];
for (i = 0; i < lines; i++) {
int f, l;
if (itv->vbi.sliced_data[i].id == 0)
continue;
l = itv->vbi.sliced_data[i].line - 6;
f = itv->vbi.sliced_data[i].field;
if (f)
l += 18;
if (l < 32)
linemask[0] |= (1 << l);
else
linemask[1] |= (1 << (l - 32));
dst[sd + 12 + line * 43] = service2vbi(itv->vbi.sliced_data[i].id);
memcpy(dst + sd + 12 + line * 43 + 1, itv->vbi.sliced_data[i].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);
memcpy(dst + sd + 4, dst + sd + 12, line * 43);
size = 4 + ((43 * line + 3) & ~3);
} else {
memcpy(dst + sd, "itv0", 4);
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);
itv->vbi.sliced_mpeg_size[idx] = sd + size;
}
static int ivtv_convert_ivtv_vbi(struct ivtv *itv, u8 *p)
{
u32 linemask[2];
int i, l, id2;
int line = 0;
if (!memcmp(p, "itv0", 4)) {
memcpy(linemask, p + 4, 8);
p += 12;
} else if (!memcmp(p, "ITV0", 4)) {
linemask[0] = 0xffffffff;
linemask[1] = 0xf;
p += 4;
} else {
/* unknown VBI data, convert to empty VBI frame */
linemask[0] = linemask[1] = 0;
}
for (i = 0; i < 36; i++) {
int err = 0;
if (i < 32 && !(linemask[0] & (1 << i)))
continue;
if (i >= 32 && !(linemask[1] & (1 << (i - 32))))
continue;
id2 = *p & 0xf;
switch (id2) {
case IVTV_SLICED_TYPE_TELETEXT_B:
id2 = V4L2_SLICED_TELETEXT_B;
break;
case IVTV_SLICED_TYPE_CAPTION_525:
id2 = V4L2_SLICED_CAPTION_525;
err = !odd_parity(p[1]) || !odd_parity(p[2]);
break;
case IVTV_SLICED_TYPE_VPS:
id2 = V4L2_SLICED_VPS;
break;
case IVTV_SLICED_TYPE_WSS_625:
id2 = V4L2_SLICED_WSS_625;
break;
default:
id2 = 0;
break;
}
if (err == 0) {
l = (i < 18) ? i + 6 : i - 18 + 6;
itv->vbi.sliced_dec_data[line].line = l;
itv->vbi.sliced_dec_data[line].field = i >= 18;
itv->vbi.sliced_dec_data[line].id = id2;
memcpy(itv->vbi.sliced_dec_data[line].data, p + 1, 42);
line++;
}
p += 43;
}
while (line < 36) {
itv->vbi.sliced_dec_data[line].id = 0;
itv->vbi.sliced_dec_data[line].line = 0;
itv->vbi.sliced_dec_data[line].field = 0;
line++;
}
return line * sizeof(itv->vbi.sliced_dec_data[0]);
}
/* Compress raw VBI format, removes leading SAV codes and surplus space after the
field.
Returns new compressed size. */
static u32 compress_raw_buf(struct ivtv *itv, u8 *buf, u32 size)
{
u32 line_size = itv->vbi.raw_decoder_line_size;
u32 lines = itv->vbi.count;
u8 sav1 = itv->vbi.raw_decoder_sav_odd_field;
u8 sav2 = itv->vbi.raw_decoder_sav_even_field;
u8 *q = buf;
u8 *p;
int i;
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] != sav1 && p[3] != sav2)) {
break;
}
memcpy(q, p + 4, line_size - 4);
q += line_size - 4;
}
return lines * (line_size - 4);
}
/* Compressed VBI format, all found sliced blocks put next to one another
Returns new compressed size */
static u32 compress_sliced_buf(struct ivtv *itv, u32 line, u8 *buf, u32 size, u8 sav)
{
u32 line_size = itv->vbi.sliced_decoder_line_size;
struct v4l2_decode_vbi_line vbi;
int i;
/* find the first valid line */
for (i = 0; i < size; i++, buf++) {
if (buf[0] == 0xff && !buf[1] && !buf[2] && buf[3] == sav)
break;
}
size -= i;
if (size < line_size) {
return line;
}
for (i = 0; i < size / line_size; i++) {
u8 *p = buf + i * line_size;
/* Look for SAV code */
if (p[0] != 0xff || p[1] || p[2] || p[3] != sav) {
continue;
}
vbi.p = p + 4;
itv->video_dec_func(itv, VIDIOC_INT_DECODE_VBI_LINE, &vbi);
if (vbi.type) {
itv->vbi.sliced_data[line].id = vbi.type;
itv->vbi.sliced_data[line].field = vbi.is_second_field;
itv->vbi.sliced_data[line].line = vbi.line;
memcpy(itv->vbi.sliced_data[line].data, vbi.p, 42);
line++;
}
}
return line;
}
void ivtv_process_vbi_data(struct ivtv *itv, struct ivtv_buffer *buf,
u64 pts_stamp, int streamtype)
{
u8 *p = (u8 *) buf->buf;
u32 size = buf->bytesused;
int y;
/* Raw VBI data */
if (streamtype == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set == 0) {
u8 type;
ivtv_buf_swap(buf);
type = p[3];
size = buf->bytesused = compress_raw_buf(itv, p, size);
/* second field of the frame? */
if (type == itv->vbi.raw_decoder_sav_even_field) {
/* Dirty hack needed for backwards
compatibility of old VBI software. */
p += size - 4;
memcpy(p, &itv->vbi.frame, 4);
itv->vbi.frame++;
}
return;
}
/* Sliced VBI data with data insertion */
if (streamtype == IVTV_ENC_STREAM_TYPE_VBI) {
int lines;
ivtv_buf_swap(buf);
/* first field */
lines = compress_sliced_buf(itv, 0, p, size / 2,
itv->vbi.sliced_decoder_sav_odd_field);
/* second field */
/* experimentation shows that the second half does not always begin
at the exact address. So start a bit earlier (hence 32). */
lines = compress_sliced_buf(itv, lines, p + size / 2 - 32, size / 2 + 32,
itv->vbi.sliced_decoder_sav_even_field);
/* always return at least one empty line */
if (lines == 0) {
itv->vbi.sliced_data[0].id = 0;
itv->vbi.sliced_data[0].line = 0;
itv->vbi.sliced_data[0].field = 0;
lines = 1;
}
buf->bytesused = size = lines * sizeof(itv->vbi.sliced_data[0]);
memcpy(p, &itv->vbi.sliced_data[0], size);
if (itv->vbi.insert_mpeg) {
copy_vbi_data(itv, lines, pts_stamp);
}
itv->vbi.frame++;
return;
}
/* Sliced VBI re-inserted from an MPEG stream */
if (streamtype == IVTV_DEC_STREAM_TYPE_VBI) {
/* If the size is not 4-byte aligned, then the starting address
for the swapping is also shifted. After swapping the data the
real start address of the VBI data is exactly 4 bytes after the
original start. It's a bit fiddly but it works like a charm.
Non-4-byte alignment happens when an lseek is done on the input
mpeg file to a non-4-byte aligned position. So on arrival here
the VBI data is also non-4-byte aligned. */
int offset = size & 3;
int cnt;
if (offset) {
p += 4 - offset;
}
/* Swap Buffer */
for (y = 0; y < size; y += 4) {
swab32s((u32 *)(p + y));
}
cnt = ivtv_convert_ivtv_vbi(itv, p + offset);
memcpy(buf->buf, itv->vbi.sliced_dec_data, cnt);
buf->bytesused = cnt;
ivtv_write_vbi(itv, itv->vbi.sliced_dec_data,
cnt / sizeof(itv->vbi.sliced_dec_data[0]));
return;
}
}
void ivtv_disable_cc(struct ivtv *itv)
{
struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
ivtv_set_cc(itv, 0, &cc);
itv->vbi.cc_payload_idx = 0;
}
void ivtv_vbi_work_handler(struct ivtv *itv)
{
struct vbi_info *vi = &itv->vbi;
struct v4l2_sliced_vbi_data data;
struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
/* Lock */
if (itv->output_mode == OUT_PASSTHROUGH) {
if (itv->is_50hz) {
data.id = V4L2_SLICED_WSS_625;
data.field = 0;
if (itv->video_dec_func(itv, VIDIOC_INT_G_VBI_DATA, &data) == 0) {
ivtv_set_wss(itv, 1, data.data[0] & 0xf);
vi->wss_missing_cnt = 0;
} else if (vi->wss_missing_cnt == 4) {
ivtv_set_wss(itv, 1, 0x8); /* 4x3 full format */
} else {
vi->wss_missing_cnt++;
}
}
else {
int mode = 0;
data.id = V4L2_SLICED_CAPTION_525;
data.field = 0;
if (itv->video_dec_func(itv, VIDIOC_INT_G_VBI_DATA, &data) == 0) {
mode |= 1;
cc.odd[0] = data.data[0];
cc.odd[1] = data.data[1];
}
data.field = 1;
if (itv->video_dec_func(itv, VIDIOC_INT_G_VBI_DATA, &data) == 0) {
mode |= 2;
cc.even[0] = data.data[0];
cc.even[1] = data.data[1];
}
if (mode) {
vi->cc_missing_cnt = 0;
ivtv_set_cc(itv, mode, &cc);
} else if (vi->cc_missing_cnt == 4) {
ivtv_set_cc(itv, 0, &cc);
} else {
vi->cc_missing_cnt++;
}
}
return;
}
if (test_and_clear_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags)) {
ivtv_set_wss(itv, 1, vi->wss_payload & 0xf);
}
if (test_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags)) {
if (vi->cc_payload_idx == 0) {
clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
ivtv_set_cc(itv, 3, &cc);
}
while (vi->cc_payload_idx) {
cc = vi->cc_payload[0];
memcpy(vi->cc_payload, vi->cc_payload + 1,
sizeof(vi->cc_payload) - sizeof(vi->cc_payload[0]));
vi->cc_payload_idx--;
if (vi->cc_payload_idx && cc.odd[0] == 0x80 && cc.odd[1] == 0x80)
continue;
ivtv_set_cc(itv, 3, &cc);
break;
}
}
if (test_and_clear_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags)) {
ivtv_set_vps(itv, 1);
}
}
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