52fcb3ecc6
Add a Memory Descriptor List (MDL) layer to buffer handling to implement scatter-gather I/O. Currently there is still only 1 buffer per MDL. Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
277 lines
8 KiB
C
277 lines
8 KiB
C
/*
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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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/*
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* Raster Reference/Protection (RP) bytes, used in Start/End Active
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* Video codes emitted from the digitzer in VIP 1.x mode, that flag the start
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* of VBI sample or VBI ancilliary data regions in the digitial ratser line.
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*
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* Task FieldEven VerticalBlank HorizontalBlank 0 0 0 0
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*/
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static const u8 raw_vbi_sav_rp[2] = { 0x20, 0x60 }; /* __V_, _FV_ */
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static const u8 sliced_vbi_eav_rp[2] = { 0xb0, 0xf0 }; /* T_VH, TFVH */
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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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/* MPEG-2 Program Pack */
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0x00, 0x00, 0x01, 0xba, /* Prog Pack start code */
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0x44, 0x00, 0x0c, 0x66, 0x24, 0x01, /* SCR, SCR Ext, markers */
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0x01, 0xd1, 0xd3, /* Mux Rate, markers */
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0xfa, 0xff, 0xff, /* Res, Suff cnt, Stuff */
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/* MPEG-2 Private Stream 1 PES Packet */
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0x00, 0x00, 0x01, 0xbd, /* Priv Stream 1 start */
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0x00, 0x1a, /* length */
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0x84, 0x80, 0x07, /* flags, hdr data len */
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0x21, 0x00, 0x5d, 0x63, 0xa7, /* PTS, markers */
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0xff, 0xff /* stuffing */
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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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dst[sd + 12 + line * 43] = cx18_service2vbi(sdata->id);
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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, "itv0", 4);
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cpu_to_le32s(&linemask[0]);
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cpu_to_le32s(&linemask[1]);
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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 frame. Returns new compressed size. */
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/* FIXME - this function ignores the input size. */
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static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size)
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{
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u32 line_size = vbi_active_samples;
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u32 lines = cx->vbi.count * 2;
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u8 *q = buf;
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u8 *p;
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int i;
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/* Skip the header */
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buf += hdr_size;
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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] != raw_vbi_sav_rp[0] &&
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p[3] != raw_vbi_sav_rp[1]))
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break;
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if (i == lines - 1) {
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/* last line is hdr_size bytes short - extrapolate it */
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memcpy(q, p + 4, line_size - 4 - hdr_size);
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q += line_size - 4 - hdr_size;
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p += line_size - hdr_size - 1;
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memset(q, (int) *p, hdr_size);
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} else {
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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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}
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return lines * (line_size - 4);
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}
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static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size,
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const u32 hdr_size)
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{
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struct v4l2_decode_vbi_line vbi;
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int i;
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u32 line = 0;
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u32 line_size = cx->is_60hz ? vbi_hblank_samples_60Hz
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: vbi_hblank_samples_50Hz;
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/* find the first valid line */
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for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) {
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if (buf[0] == 0xff && !buf[1] && !buf[2] &&
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(buf[3] == sliced_vbi_eav_rp[0] ||
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buf[3] == sliced_vbi_eav_rp[1]))
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break;
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}
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/*
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* The last line is short by hdr_size bytes, but for the remaining
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* checks against size, we pretend that it is not, by counting the
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* header bytes we knowingly skipped
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*/
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size -= (i - hdr_size);
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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 EAV code */
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if (p[0] != 0xff || p[1] || p[2] ||
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(p[3] != sliced_vbi_eav_rp[0] &&
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p[3] != sliced_vbi_eav_rp[1]))
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continue;
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vbi.p = p + 4;
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v4l2_subdev_call(cx->sd_av, video, 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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static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf)
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{
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/*
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* The CX23418 provides a 12 byte header in its raw VBI buffers to us:
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* 0x3fffffff [4 bytes of something] [4 byte presentation time stamp]
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*/
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struct vbi_data_hdr {
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__be32 magic;
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__be32 unknown;
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__be32 pts;
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} *hdr = (struct vbi_data_hdr *) buf->buf;
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u8 *p = (u8 *) buf->buf;
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u32 size = buf->bytesused;
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u32 pts;
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int lines;
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/*
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* The CX23418 sends us data that is 32 bit little-endian swapped,
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* but we want the raw VBI bytes in the order they were in the raster
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* line. This has a side effect of making the header big endian
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*/
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cx18_buf_swap(buf);
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/* Raw VBI data */
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if (cx18_raw_vbi(cx)) {
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size = buf->bytesused =
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compress_raw_buf(cx, p, size, sizeof(struct vbi_data_hdr));
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/*
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* Hack needed for compatibility with old VBI software.
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* Write the frame # at the last 4 bytes of the frame
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*/
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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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return;
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}
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/* Sliced VBI data with data insertion */
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pts = (be32_to_cpu(hdr->magic) == 0x3fffffff) ? be32_to_cpu(hdr->pts)
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: 0;
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lines = compress_sliced_buf(cx, p, size, sizeof(struct vbi_data_hdr));
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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);
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cx->vbi.frame++;
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}
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void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl,
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int streamtype)
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{
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struct cx18_buffer *buf;
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u32 orig_used;
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if (streamtype != CX18_ENC_STREAM_TYPE_VBI)
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return;
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/*
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* Big assumption here:
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* Every buffer hooked to the MDL's buf_list is a complete VBI frame
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* that ends at the end of the buffer.
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*
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* To assume anything else would make the code in this file
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* more complex, or require extra memcpy()'s to make the
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* buffers satisfy the above assumption. It's just simpler to set
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* up the encoder buffer transfers to make the assumption true.
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*/
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list_for_each_entry(buf, &mdl->buf_list, list) {
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orig_used = buf->bytesused;
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if (orig_used == 0)
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break;
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_cx18_process_vbi_data(cx, buf);
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mdl->bytesused -= (orig_used - buf->bytesused);
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}
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}
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