2008-04-28 19:24:33 -04:00
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/*
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* cx18 Vertical Blank Interval support functions
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*
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* Derived from ivtv-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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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#include "cx18-driver.h"
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#include "cx18-vbi.h"
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#include "cx18-ioctl.h"
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#include "cx18-queue.h"
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#include "cx18-av-core.h"
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static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp)
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{
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int line = 0;
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int i;
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u32 linemask[2] = { 0, 0 };
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unsigned short size;
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static const u8 mpeg_hdr_data[] = {
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0x00, 0x00, 0x01, 0xba, 0x44, 0x00, 0x0c, 0x66,
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0x24, 0x01, 0x01, 0xd1, 0xd3, 0xfa, 0xff, 0xff,
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0x00, 0x00, 0x01, 0xbd, 0x00, 0x1a, 0x84, 0x80,
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0x07, 0x21, 0x00, 0x5d, 0x63, 0xa7, 0xff, 0xff
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};
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const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */
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int idx = cx->vbi.frame % CX18_VBI_FRAMES;
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u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0];
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for (i = 0; i < lines; i++) {
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struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i;
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int f, l;
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if (sdata->id == 0)
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continue;
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l = sdata->line - 6;
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f = sdata->field;
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if (f)
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l += 18;
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if (l < 32)
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linemask[0] |= (1 << l);
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else
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linemask[1] |= (1 << (l - 32));
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2008-04-29 20:38:51 -04:00
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dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id);
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2008-04-28 19:24:33 -04:00
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memcpy(dst + sd + 12 + line * 43 + 1, sdata->data, 42);
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line++;
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}
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memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));
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if (line == 36) {
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/* All lines are used, so there is no space for the linemask
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(the max size of the VBI data is 36 * 43 + 4 bytes).
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So in this case we use the magic number 'ITV0'. */
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memcpy(dst + sd, "ITV0", 4);
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memcpy(dst + sd + 4, dst + sd + 12, line * 43);
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size = 4 + ((43 * line + 3) & ~3);
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} else {
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memcpy(dst + sd, "cx0", 4);
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memcpy(dst + sd + 4, &linemask[0], 8);
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size = 12 + ((43 * line + 3) & ~3);
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}
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dst[4+16] = (size + 10) >> 8;
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dst[5+16] = (size + 10) & 0xff;
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dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6);
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dst[10+16] = (pts_stamp >> 22) & 0xff;
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dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff);
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dst[12+16] = (pts_stamp >> 7) & 0xff;
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dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1);
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cx->vbi.sliced_mpeg_size[idx] = sd + size;
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}
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/* Compress raw VBI format, removes leading SAV codes and surplus space
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after the field.
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Returns new compressed size. */
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static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size)
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{
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u32 line_size = cx->vbi.raw_decoder_line_size;
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u32 lines = cx->vbi.count;
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u8 sav1 = cx->vbi.raw_decoder_sav_odd_field;
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u8 sav2 = cx->vbi.raw_decoder_sav_even_field;
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u8 *q = buf;
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u8 *p;
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int i;
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for (i = 0; i < lines; i++) {
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p = buf + i * line_size;
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/* Look for SAV code */
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if (p[0] != 0xff || p[1] || p[2] ||
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(p[3] != sav1 && p[3] != sav2))
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break;
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memcpy(q, p + 4, line_size - 4);
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q += line_size - 4;
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}
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return lines * (line_size - 4);
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}
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/* Compressed VBI format, all found sliced blocks put next to one another
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Returns new compressed size */
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static u32 compress_sliced_buf(struct cx18 *cx, u32 line, u8 *buf,
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u32 size, u8 sav)
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{
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u32 line_size = cx->vbi.sliced_decoder_line_size;
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struct v4l2_decode_vbi_line vbi;
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int i;
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/* find the first valid line */
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for (i = 0; i < size; i++, buf++) {
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if (buf[0] == 0xff && !buf[1] && !buf[2] && buf[3] == sav)
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break;
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}
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size -= i;
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if (size < line_size)
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return line;
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for (i = 0; i < size / line_size; i++) {
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u8 *p = buf + i * line_size;
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/* Look for SAV code */
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if (p[0] != 0xff || p[1] || p[2] || p[3] != sav)
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continue;
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vbi.p = p + 4;
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cx18_av_cmd(cx, VIDIOC_INT_DECODE_VBI_LINE, &vbi);
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if (vbi.type) {
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cx->vbi.sliced_data[line].id = vbi.type;
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cx->vbi.sliced_data[line].field = vbi.is_second_field;
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cx->vbi.sliced_data[line].line = vbi.line;
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memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42);
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line++;
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}
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}
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return line;
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}
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void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf,
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u64 pts_stamp, int streamtype)
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{
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u8 *p = (u8 *) buf->buf;
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u32 size = buf->bytesused;
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int lines;
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if (streamtype != CX18_ENC_STREAM_TYPE_VBI)
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return;
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/* Raw VBI data */
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2008-12-12 14:24:04 -05:00
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if (cx18_raw_vbi(cx)) {
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2008-04-28 19:24:33 -04:00
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u8 type;
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cx18_buf_swap(buf);
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2008-12-12 18:00:29 -05:00
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/* Skip 12 bytes of header that gets stuffed in */
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size -= 12;
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memcpy(p, &buf->buf[12], size);
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2008-04-28 19:24:33 -04:00
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type = p[3];
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size = buf->bytesused = compress_raw_buf(cx, p, size);
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/* second field of the frame? */
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if (type == cx->vbi.raw_decoder_sav_even_field) {
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/* Dirty hack needed for backwards
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compatibility of old VBI software. */
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p += size - 4;
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memcpy(p, &cx->vbi.frame, 4);
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cx->vbi.frame++;
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}
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return;
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}
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/* Sliced VBI data with data insertion */
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cx18_buf_swap(buf);
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/* first field */
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lines = compress_sliced_buf(cx, 0, p, size / 2,
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cx->vbi.sliced_decoder_sav_odd_field);
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/* second field */
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/* experimentation shows that the second half does not always
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begin at the exact address. So start a bit earlier
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(hence 32). */
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lines = compress_sliced_buf(cx, lines, p + size / 2 - 32,
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size / 2 + 32, cx->vbi.sliced_decoder_sav_even_field);
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/* always return at least one empty line */
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if (lines == 0) {
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cx->vbi.sliced_data[0].id = 0;
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cx->vbi.sliced_data[0].line = 0;
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cx->vbi.sliced_data[0].field = 0;
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lines = 1;
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}
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buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]);
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memcpy(p, &cx->vbi.sliced_data[0], size);
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if (cx->vbi.insert_mpeg)
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copy_vbi_data(cx, lines, pts_stamp);
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cx->vbi.frame++;
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}
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