/* * cx18 Vertical Blank Interval support functions * * Derived from ivtv-vbi.c * * Copyright (C) 2007 Hans Verkuil * * 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" /* * Raster Reference/Protection (RP) bytes, used in Start/End Active * Video codes emitted from the digitzer in VIP 1.x mode, that flag the start * of VBI sample or VBI ancilliary data regions in the digitial ratser line. * * Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0 */ static const u8 raw_vbi_sav_rp[2] = { 0x20, 0x60 }; /* __V_, _FV_ */ static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */ 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[] = { /* MPEG-2 Program Pack */ 0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */ 0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */ 0x01, 0xd1, 0xd3, /* Mux Rate, markers */ 0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */ /* MPEG-2 Private Stream 1 PES Packet */ 0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */ 0x00, 0x1a, /* length */ 0x84, 0x80, 0x07, /* flags, hdr data len */ 0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */ 0xff, 0xff /* stuffing */ }; 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] = cx18_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, "itv0", 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 = vbi_active_samples; u32 lines = cx->vbi.count; u8 sav1 = raw_vbi_sav_rp[0]; u8 sav2 = raw_vbi_sav_rp[1]; 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 eav) { struct v4l2_decode_vbi_line vbi; int i; u32 line_size = cx->is_60hz ? vbi_hblank_samples_60Hz : vbi_hblank_samples_50Hz; /* find the first valid line */ for (i = 0; i < size; i++, buf++) { if (buf[0] == 0xff && !buf[1] && !buf[2] && buf[3] == eav) 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 EAV code */ if (p[0] != 0xff || p[1] || p[2] || p[3] != eav) 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, int streamtype) { u8 *p = (u8 *) buf->buf; u32 *q = (u32 *) buf->buf; u32 size = buf->bytesused; u32 pts; int lines; if (streamtype != CX18_ENC_STREAM_TYPE_VBI) return; cx18_buf_swap(buf); /* * The CX23418 provides a 12 byte header in it's raw VBI buffers to us: * 0x3fffffff [4 bytes of something] [4 byte presentation time stamp?] */ /* Raw VBI data */ if (cx18_raw_vbi(cx)) { u8 type; /* Skip 12 bytes of header that gets stuffed in */ size -= 12; memcpy(p, &buf->buf[12], size); type = p[3]; size = buf->bytesused = compress_raw_buf(cx, p, size); /* second field of the frame? */ if (type == raw_vbi_sav_rp[1]) { /* 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 */ pts = (q[0] == 0x3fffffff) ? q[2] : 0; /* first field */ /* compress_sliced_buf() will skip the 12 bytes of header */ lines = compress_sliced_buf(cx, 0, p, size / 2, sliced_vbi_eav_rp[0]); /* 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, sliced_vbi_eav_rp[1]); /* 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); cx->vbi.frame++; }