V4L/DVB (7786): cx18: new driver for the Conexant CX23418 MPEG encoder chip

Many thanks to Steve Toth from Hauppauge and Nattu Dakshinamurthy from
Conexant for their support. I am in particular thankful to Hauppauge
since without their help this driver would not exist. It should also
be noted that Steve did the work to get the DVB part up and running.
Thank you!

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: G. Andrew Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

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 000000000000..4bece9c02f7d
--- /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++;
+}