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linux/drivers/media/video/ivtv/ivtv-vbi.c

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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-cards.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_call_hw(itv, IVTV_HW_SAA7127, video, 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_call_hw(itv, IVTV_HW_SAA7127, video, 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_call_hw(itv, IVTV_HW_SAA7127, video, 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_call_hw(itv, IVTV_HW_SAA7127, video, 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] =
ivtv_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);
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);
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;
unsigned lines = 0;
/* 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;
v4l2_subdev_call(itv->sd_video, video, decode_vbi_line, &vbi);
if (vbi.type && !(lines & (1 << vbi.line))) {
lines |= 1 << vbi.line;
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 && ivtv_raw_vbi(itv)) {
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 (v4l2_subdev_call(itv->sd_video, video, 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 (v4l2_subdev_call(itv->sd_video, video, g_vbi_data, &data) == 0) {
mode |= 1;
cc.odd[0] = data.data[0];
cc.odd[1] = data.data[1];
}
data.field = 1;
if (v4l2_subdev_call(itv->sd_video, video, 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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