diff options
Diffstat (limited to 'drivers/media/pci/cx18/cx18-vbi.c')
| -rw-r--r-- | drivers/media/pci/cx18/cx18-vbi.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-vbi.c b/drivers/media/pci/cx18/cx18-vbi.c new file mode 100644 index 0000000..add9964 --- /dev/null +++ b/drivers/media/pci/cx18/cx18-vbi.c @@ -0,0 +1,277 @@ +/* + * 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" + +/* + * 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 ancillary 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); + 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); + cx->vbi.sliced_mpeg_size[idx] = sd + size; +} + +/* Compress raw VBI format, removes leading SAV codes and surplus space + after the frame. Returns new compressed size. */ +/* FIXME - this function ignores the input size. */ +static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size) +{ + u32 line_size = vbi_active_samples; + u32 lines = cx->vbi.count * 2; + u8 *q = buf; + u8 *p; + int i; + + /* Skip the header */ + buf += hdr_size; + + 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] != raw_vbi_sav_rp[0] && + p[3] != raw_vbi_sav_rp[1])) + break; + if (i == lines - 1) { + /* last line is hdr_size bytes short - extrapolate it */ + memcpy(q, p + 4, line_size - 4 - hdr_size); + q += line_size - 4 - hdr_size; + p += line_size - hdr_size - 1; + memset(q, (int) *p, hdr_size); + } else { + memcpy(q, p + 4, line_size - 4); + q += line_size - 4; + } + } + return lines * (line_size - 4); +} + +static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size, + const u32 hdr_size) +{ + struct v4l2_decode_vbi_line vbi; + int i; + u32 line = 0; + u32 line_size = cx->is_60hz ? vbi_hblank_samples_60Hz + : vbi_hblank_samples_50Hz; + + /* find the first valid line */ + for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) { + if (buf[0] == 0xff && !buf[1] && !buf[2] && + (buf[3] == sliced_vbi_eav_rp[0] || + buf[3] == sliced_vbi_eav_rp[1])) + break; + } + + /* + * The last line is short by hdr_size bytes, but for the remaining + * checks against size, we pretend that it is not, by counting the + * header bytes we knowingly skipped + */ + size -= (i - hdr_size); + 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] != sliced_vbi_eav_rp[0] && + p[3] != sliced_vbi_eav_rp[1])) + continue; + vbi.p = p + 4; + v4l2_subdev_call(cx->sd_av, vbi, 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; +} + +static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf) +{ + /* + * The CX23418 provides a 12 byte header in its raw VBI buffers to us: + * 0x3fffffff [4 bytes of something] [4 byte presentation time stamp] + */ + struct vbi_data_hdr { + __be32 magic; + __be32 unknown; + __be32 pts; + } *hdr = (struct vbi_data_hdr *) buf->buf; + + u8 *p = (u8 *) buf->buf; + u32 size = buf->bytesused; + u32 pts; + int lines; + + /* + * The CX23418 sends us data that is 32 bit little-endian swapped, + * but we want the raw VBI bytes in the order they were in the raster + * line. This has a side effect of making the header big endian + */ + cx18_buf_swap(buf); + + /* Raw VBI data */ + if (cx18_raw_vbi(cx)) { + + size = buf->bytesused = + compress_raw_buf(cx, p, size, sizeof(struct vbi_data_hdr)); + + /* + * Hack needed for compatibility with old VBI software. + * Write the frame # at the last 4 bytes of the frame + */ + p += size - 4; + memcpy(p, &cx->vbi.frame, 4); + cx->vbi.frame++; + return; + } + + /* Sliced VBI data with data insertion */ + + pts = (be32_to_cpu(hdr->magic) == 0x3fffffff) ? be32_to_cpu(hdr->pts) + : 0; + + lines = compress_sliced_buf(cx, p, size, sizeof(struct vbi_data_hdr)); + + /* 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++; +} + +void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl, + int streamtype) +{ + struct cx18_buffer *buf; + u32 orig_used; + + if (streamtype != CX18_ENC_STREAM_TYPE_VBI) + return; + + /* + * Big assumption here: + * Every buffer hooked to the MDL's buf_list is a complete VBI frame + * that ends at the end of the buffer. + * + * To assume anything else would make the code in this file + * more complex, or require extra memcpy()'s to make the + * buffers satisfy the above assumption. It's just simpler to set + * up the encoder buffer transfers to make the assumption true. + */ + list_for_each_entry(buf, &mdl->buf_list, list) { + orig_used = buf->bytesused; + if (orig_used == 0) + break; + _cx18_process_vbi_data(cx, buf); + mdl->bytesused -= (orig_used - buf->bytesused); + } +} |