summaryrefslogtreecommitdiffstats
path: root/drivers/media/pci/ivtv/ivtv-vbi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/pci/ivtv/ivtv-vbi.c')
-rw-r--r--drivers/media/pci/ivtv/ivtv-vbi.c537
1 files changed, 537 insertions, 0 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-vbi.c b/drivers/media/pci/ivtv/ivtv-vbi.c
new file mode 100644
index 000000000..80478b026
--- /dev/null
+++ b/drivers/media/pci/ivtv/ivtv-vbi.c
@@ -0,0 +1,537 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ Vertical Blank Interval support functions
+ Copyright (C) 2004-2007 Hans Verkuil <hverkuil@xs4all.nl>
+
+ */
+
+#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, vbi, 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, vbi, 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, vbi, 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_out & 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, vbi, s_vbi_data, &data);
+}
+
+static int odd_parity(u8 c)
+{
+ c ^= (c >> 4);
+ c ^= (c >> 2);
+ c ^= (c >> 1);
+
+ return c & 1;
+}
+
+static void ivtv_write_vbi_line(struct ivtv *itv,
+ const struct v4l2_sliced_vbi_data *d,
+ struct vbi_cc *cc, int *found_cc)
+{
+ struct vbi_info *vi = &itv->vbi;
+
+ 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);
+ }
+ }
+}
+
+static void ivtv_write_vbi_cc_lines(struct ivtv *itv, const struct vbi_cc *cc)
+{
+ struct vbi_info *vi = &itv->vbi;
+
+ if (vi->cc_payload_idx < ARRAY_SIZE(vi->cc_payload)) {
+ memcpy(&vi->cc_payload[vi->cc_payload_idx], cc,
+ sizeof(struct vbi_cc));
+ vi->cc_payload_idx++;
+ set_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
+ }
+}
+
+static void ivtv_write_vbi(struct ivtv *itv,
+ const struct v4l2_sliced_vbi_data *sliced,
+ size_t cnt)
+{
+ struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
+ int found_cc = 0;
+ size_t i;
+
+ for (i = 0; i < cnt; i++)
+ ivtv_write_vbi_line(itv, sliced + i, &cc, &found_cc);
+
+ if (found_cc)
+ ivtv_write_vbi_cc_lines(itv, &cc);
+}
+
+ssize_t
+ivtv_write_vbi_from_user(struct ivtv *itv,
+ const struct v4l2_sliced_vbi_data __user *sliced,
+ size_t cnt)
+{
+ struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
+ int found_cc = 0;
+ size_t i;
+ struct v4l2_sliced_vbi_data d;
+ ssize_t ret = cnt * sizeof(struct v4l2_sliced_vbi_data);
+
+ for (i = 0; i < cnt; i++) {
+ if (copy_from_user(&d, sliced + i,
+ sizeof(struct v4l2_sliced_vbi_data))) {
+ ret = -EFAULT;
+ break;
+ }
+ ivtv_write_vbi_line(itv, &d, &cc, &found_cc);
+ }
+
+ if (found_cc)
+ ivtv_write_vbi_cc_lines(itv, &cc);
+
+ return ret;
+}
+
+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);
+ 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);
+ 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, vbi, 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, vbi, 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, vbi, 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, vbi, 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];
+
+ memmove(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);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 13:33:14 +0000