314 lines
8.8 KiB
C
314 lines
8.8 KiB
C
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/*
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* cx18 ADEC VBI functions
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*
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* Derived from cx25840-vbi.c
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include "cx18-driver.h"
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/*
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* For sliced VBI output, we set up to use VIP-1.1, 8-bit mode,
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* NN counts 1 byte Dwords, an IDID with the VBI line # in it.
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* Thus, according to the VIP-2 Spec, our VBI ancillary data lines
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* (should!) look like:
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* 4 byte EAV code: 0xff 0x00 0x00 0xRP
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* unknown number of possible idle bytes
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* 3 byte Anc data preamble: 0x00 0xff 0xff
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* 1 byte data identifier: ne010iii (parity bits, 010, DID bits)
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* 1 byte secondary data id: nessssss (parity bits, SDID bits)
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* 1 byte data word count: necccccc (parity bits, NN Dword count)
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* 2 byte Internal DID: VBI-line-# 0x80
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* NN data bytes
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* 1 byte checksum
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* Fill bytes needed to fil out to 4*NN bytes of payload
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*
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* The RP codes for EAVs when in VIP-1.1 mode, not in raw mode, &
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* in the vertical blanking interval are:
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* 0xb0 (Task 0 VerticalBlank HorizontalBlank 0 0 0 0)
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* 0xf0 (Task EvenField VerticalBlank HorizontalBlank 0 0 0 0)
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*
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* Since the V bit is only allowed to toggle in the EAV RP code, just
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* before the first active region line and for active lines, they are:
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* 0x90 (Task 0 0 HorizontalBlank 0 0 0 0)
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* 0xd0 (Task EvenField 0 HorizontalBlank 0 0 0 0)
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*
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* The user application DID bytes we care about are:
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* 0x91 (1 0 010 0 !ActiveLine AncDataPresent)
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* 0x55 (0 1 010 2ndField !ActiveLine AncDataPresent)
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*
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*/
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static const u8 sliced_vbi_did[2] = { 0x91, 0x55 };
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struct vbi_anc_data {
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/* u8 eav[4]; */
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/* u8 idle[]; Variable number of idle bytes */
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u8 preamble[3];
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u8 did;
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u8 sdid;
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u8 data_count;
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u8 idid[2];
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u8 payload[1]; /* data_count of payload */
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/* u8 checksum; */
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/* u8 fill[]; Variable number of fill bytes */
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};
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static int odd_parity(u8 c)
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{
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c ^= (c >> 4);
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c ^= (c >> 2);
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c ^= (c >> 1);
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return c & 1;
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}
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static int decode_vps(u8 *dst, u8 *p)
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{
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static const u8 biphase_tbl[] = {
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0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
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0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
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0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
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0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
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0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
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0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
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0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
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0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
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0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
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0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
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0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
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0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
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0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
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0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
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0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
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0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
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0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
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0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
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0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
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0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
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0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
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0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
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0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
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0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
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0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
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0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
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0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
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0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
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0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
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0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
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0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
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0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
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};
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u8 c, err = 0;
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int i;
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for (i = 0; i < 2 * 13; i += 2) {
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err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
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c = (biphase_tbl[p[i + 1]] & 0xf) |
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((biphase_tbl[p[i]] & 0xf) << 4);
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dst[i / 2] = c;
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}
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return err & 0xf0;
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}
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int cx18_av_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
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{
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struct cx18 *cx = v4l2_get_subdevdata(sd);
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struct cx18_av_state *state = &cx->av_state;
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static const u16 lcr2vbi[] = {
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0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */
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0, V4L2_SLICED_WSS_625, 0, /* 4 */
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V4L2_SLICED_CAPTION_525, /* 6 */
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0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */
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0, 0, 0, 0
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};
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int is_pal = !(state->std & V4L2_STD_525_60);
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int i;
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memset(svbi->service_lines, 0, sizeof(svbi->service_lines));
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svbi->service_set = 0;
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/* we're done if raw VBI is active */
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if ((cx18_av_read(cx, 0x404) & 0x10) == 0)
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return 0;
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if (is_pal) {
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for (i = 7; i <= 23; i++) {
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u8 v = cx18_av_read(cx, 0x424 + i - 7);
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svbi->service_lines[0][i] = lcr2vbi[v >> 4];
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svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
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svbi->service_set |= svbi->service_lines[0][i] |
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svbi->service_lines[1][i];
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}
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} else {
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for (i = 10; i <= 21; i++) {
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u8 v = cx18_av_read(cx, 0x424 + i - 10);
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svbi->service_lines[0][i] = lcr2vbi[v >> 4];
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svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
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svbi->service_set |= svbi->service_lines[0][i] |
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svbi->service_lines[1][i];
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}
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}
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return 0;
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}
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int cx18_av_s_raw_fmt(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt)
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{
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struct cx18 *cx = v4l2_get_subdevdata(sd);
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struct cx18_av_state *state = &cx->av_state;
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/* Setup standard */
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cx18_av_std_setup(cx);
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/* VBI Offset */
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cx18_av_write(cx, 0x47f, state->slicer_line_delay);
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cx18_av_write(cx, 0x404, 0x2e);
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return 0;
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}
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int cx18_av_s_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *svbi)
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{
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struct cx18 *cx = v4l2_get_subdevdata(sd);
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struct cx18_av_state *state = &cx->av_state;
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int is_pal = !(state->std & V4L2_STD_525_60);
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int i, x;
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u8 lcr[24];
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for (x = 0; x <= 23; x++)
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lcr[x] = 0x00;
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/* Setup standard */
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cx18_av_std_setup(cx);
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/* Sliced VBI */
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cx18_av_write(cx, 0x404, 0x32); /* Ancillary data */
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cx18_av_write(cx, 0x406, 0x13);
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cx18_av_write(cx, 0x47f, state->slicer_line_delay);
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/* Force impossible lines to 0 */
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if (is_pal) {
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for (i = 0; i <= 6; i++)
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svbi->service_lines[0][i] =
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svbi->service_lines[1][i] = 0;
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} else {
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for (i = 0; i <= 9; i++)
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svbi->service_lines[0][i] =
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svbi->service_lines[1][i] = 0;
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for (i = 22; i <= 23; i++)
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svbi->service_lines[0][i] =
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svbi->service_lines[1][i] = 0;
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}
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/* Build register values for requested service lines */
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for (i = 7; i <= 23; i++) {
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for (x = 0; x <= 1; x++) {
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switch (svbi->service_lines[1-x][i]) {
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case V4L2_SLICED_TELETEXT_B:
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lcr[i] |= 1 << (4 * x);
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break;
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case V4L2_SLICED_WSS_625:
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lcr[i] |= 4 << (4 * x);
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break;
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case V4L2_SLICED_CAPTION_525:
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lcr[i] |= 6 << (4 * x);
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break;
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case V4L2_SLICED_VPS:
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lcr[i] |= 9 << (4 * x);
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break;
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}
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}
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}
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if (is_pal) {
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for (x = 1, i = 0x424; i <= 0x434; i++, x++)
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cx18_av_write(cx, i, lcr[6 + x]);
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} else {
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for (x = 1, i = 0x424; i <= 0x430; i++, x++)
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cx18_av_write(cx, i, lcr[9 + x]);
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for (i = 0x431; i <= 0x434; i++)
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cx18_av_write(cx, i, 0);
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}
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cx18_av_write(cx, 0x43c, 0x16);
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/* Should match vblank set in cx18_av_std_setup() */
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cx18_av_write(cx, 0x474, is_pal ? 38 : 26);
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return 0;
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}
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int cx18_av_decode_vbi_line(struct v4l2_subdev *sd,
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struct v4l2_decode_vbi_line *vbi)
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{
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struct cx18 *cx = v4l2_get_subdevdata(sd);
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struct cx18_av_state *state = &cx->av_state;
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struct vbi_anc_data *anc = (struct vbi_anc_data *)vbi->p;
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u8 *p;
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int did, sdid, l, err = 0;
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/*
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* Check for the ancillary data header for sliced VBI
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*/
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if (anc->preamble[0] ||
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anc->preamble[1] != 0xff || anc->preamble[2] != 0xff ||
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(anc->did != sliced_vbi_did[0] &&
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anc->did != sliced_vbi_did[1])) {
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vbi->line = vbi->type = 0;
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return 0;
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}
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did = anc->did;
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sdid = anc->sdid & 0xf;
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l = anc->idid[0] & 0x3f;
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l += state->slicer_line_offset;
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p = anc->payload;
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/* Decode the SDID set by the slicer */
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switch (sdid) {
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case 1:
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sdid = V4L2_SLICED_TELETEXT_B;
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break;
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case 4:
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sdid = V4L2_SLICED_WSS_625;
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break;
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case 6:
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sdid = V4L2_SLICED_CAPTION_525;
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err = !odd_parity(p[0]) || !odd_parity(p[1]);
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break;
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case 9:
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sdid = V4L2_SLICED_VPS;
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if (decode_vps(p, p) != 0)
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err = 1;
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break;
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default:
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sdid = 0;
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err = 1;
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break;
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}
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vbi->type = err ? 0 : sdid;
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vbi->line = err ? 0 : l;
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vbi->is_second_field = err ? 0 : (did == sliced_vbi_did[1]);
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vbi->p = p;
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return 0;
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}
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