diff options
Diffstat (limited to 'drivers/media/video/cx18/cx18-vbi.c')
| -rw-r--r-- | drivers/media/video/cx18/cx18-vbi.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-vbi.c b/drivers/media/video/cx18/cx18-vbi.c new file mode 100644 index 0000000..4bece9c --- /dev/null +++ b/drivers/media/video/cx18/cx18-vbi.c @@ -0,0 +1,208 @@ +/* + * cx18 Vertical Blank Interval support functions + * + * Derived from ivtv-vbi.c + * + * Copyright (C) 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 "cx18-driver.h" +#include "cx18-vbi.h" +#include "cx18-ioctl.h" +#include "cx18-queue.h" +#include "cx18-av-core.h" + +static void copy_vbi_data(struct cx18 *cx, 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 = cx->vbi.frame % CX18_VBI_FRAMES; + u8 *dst = &cx->vbi.sliced_mpeg_data[idx][0]; + + for (i = 0; i < lines; i++) { + struct v4l2_sliced_vbi_data *sdata = cx->vbi.sliced_data + i; + int f, l; + + if (sdata->id == 0) + continue; + + l = sdata->line - 6; + f = sdata->field; + if (f) + l += 18; + if (l < 32) + linemask[0] |= (1 << l); + else + linemask[1] |= (1 << (l - 32)); + dst[sd + 12 + line * 43] = service2vbi(sdata->id); + memcpy(dst + sd + 12 + line * 43 + 1, sdata->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, "cx0", 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); + cx->vbi.sliced_mpeg_size[idx] = sd + size; +} + +/* Compress raw VBI format, removes leading SAV codes and surplus space + after the field. + Returns new compressed size. */ +static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size) +{ + u32 line_size = cx->vbi.raw_decoder_line_size; + u32 lines = cx->vbi.count; + u8 sav1 = cx->vbi.raw_decoder_sav_odd_field; + u8 sav2 = cx->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 cx18 *cx, u32 line, u8 *buf, + u32 size, u8 sav) +{ + u32 line_size = cx->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; + cx18_av_cmd(cx, VIDIOC_INT_DECODE_VBI_LINE, &vbi); + if (vbi.type) { + cx->vbi.sliced_data[line].id = vbi.type; + cx->vbi.sliced_data[line].field = vbi.is_second_field; + cx->vbi.sliced_data[line].line = vbi.line; + memcpy(cx->vbi.sliced_data[line].data, vbi.p, 42); + line++; + } + } + return line; +} + +void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf, + u64 pts_stamp, int streamtype) +{ + u8 *p = (u8 *) buf->buf; + u32 size = buf->bytesused; + int lines; + + if (streamtype != CX18_ENC_STREAM_TYPE_VBI) + return; + + /* Raw VBI data */ + if (cx->vbi.sliced_in->service_set == 0) { + u8 type; + + cx18_buf_swap(buf); + + type = p[3]; + + size = buf->bytesused = compress_raw_buf(cx, p, size); + + /* second field of the frame? */ + if (type == cx->vbi.raw_decoder_sav_even_field) { + /* Dirty hack needed for backwards + compatibility of old VBI software. */ + p += size - 4; + memcpy(p, &cx->vbi.frame, 4); + cx->vbi.frame++; + } + return; + } + + /* Sliced VBI data with data insertion */ + cx18_buf_swap(buf); + + /* first field */ + lines = compress_sliced_buf(cx, 0, p, size / 2, + cx->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(cx, lines, p + size / 2 - 32, + size / 2 + 32, cx->vbi.sliced_decoder_sav_even_field); + /* always return at least one empty line */ + if (lines == 0) { + cx->vbi.sliced_data[0].id = 0; + cx->vbi.sliced_data[0].line = 0; + cx->vbi.sliced_data[0].field = 0; + lines = 1; + } + buf->bytesused = size = lines * sizeof(cx->vbi.sliced_data[0]); + memcpy(p, &cx->vbi.sliced_data[0], size); + + if (cx->vbi.insert_mpeg) + copy_vbi_data(cx, lines, pts_stamp); + cx->vbi.frame++; +} |
