V4L/DVB (5345): ivtv driver for Conexant cx23416/cx23415 MPEG encoder/decoder

It took three core maintainers, over four years of work, eight new i2c
modules, eleven new V4L2 ioctls, three new DVB video ioctls, a Sliced
VBI API, a new MPEG encoder API, an enhanced DVB video MPEG decoding
API, major YUV/OSD contributions from Ian and John, web/wiki/svn/trac
support from Axel Thimm, (hardware) support from Hauppauge, support and
assistance from the v4l-dvb people and the many, many users of ivtv to
finally make it possible to merge this driver into the kernel.
Thank you all!

Signed-off-by: Kevin Thayer <nufan_wfk@yahoo.com>
Signed-off-by: Chris Kennedy <c@groovy.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: John P Harvey <john.p.harvey@btinternet.com>
Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 545 insertions, 0 deletions

diff --git a/drivers/media/video/ivtv/ivtv-vbi.c b/drivers/media/video/ivtv/ivtv-vbi.c
new file mode 100644
index 000000000000..b53ca508dacc
--- /dev/null
+++ b/drivers/media/video/ivtv/ivtv-vbi.c
@@ -0,0 +1,545 @@
+/*
+    Vertical Blank Interval support functions
+    Copyright (C) 2004-2007  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 "ivtv-driver.h"
+#include "ivtv-video.h"
+#include "ivtv-vbi.h"
+#include "ivtv-ioctl.h"
+#include "ivtv-queue.h"
+
+static int odd_parity(u8 c)
+{
+	c ^= (c >> 4);
+	c ^= (c >> 2);
+	c ^= (c >> 1);
+
+	return c & 1;
+}
+
+void vbi_schedule_work(struct ivtv *itv)
+{
+	queue_work(itv->vbi.work_queues, &itv->vbi.work_queue);
+}
+
+static void passthrough_vbi_data(struct ivtv *itv, int cnt)
+{
+	int wss = 0;
+	u8 cc[4] = { 0x80, 0x80, 0x80, 0x80 };
+	u8 vps[13];
+	int found_cc = 0;
+	int found_wss = 0;
+	int found_vps = 0;
+	int cc_pos = itv->vbi.cc_pos;
+	int i;
+
+	for (i = 0; i < cnt; i++) {
+		struct v4l2_sliced_vbi_data *d = itv->vbi.sliced_dec_data + i;
+
+		if (d->id == V4L2_SLICED_CAPTION_525 && d->line == 21) {
+			found_cc = 1;
+			if (d->field) {
+				cc[2] = d->data[0];
+				cc[3] = d->data[1];
+			} else {
+				cc[0] = d->data[0];
+				cc[1] = d->data[1];
+			}
+		}
+		else if (d->id == V4L2_SLICED_VPS && d->line == 16 && d->field == 0) {
+			memcpy(vps, d->data, sizeof(vps));
+			found_vps = 1;
+		}
+		else if (d->id == V4L2_SLICED_WSS_625 && d->line == 23 && d->field == 0) {
+			wss = d->data[0] | d->data[1] << 8;
+			found_wss = 1;
+		}
+	}
+
+	if (itv->vbi.wss_found != found_wss || itv->vbi.wss != wss) {
+		itv->vbi.wss = wss;
+		itv->vbi.wss_found = found_wss;
+		set_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags);
+	}
+
+	if (found_vps || itv->vbi.vps_found) {
+		itv->vbi.vps[0] = vps[2];
+		itv->vbi.vps[1] = vps[8];
+		itv->vbi.vps[2] = vps[9];
+		itv->vbi.vps[3] = vps[10];
+		itv->vbi.vps[4] = vps[11];
+		itv->vbi.vps_found = found_vps;
+		set_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags);
+	}
+
+	if (found_cc && cc_pos < sizeof(itv->vbi.cc_data_even)) {
+		itv->vbi.cc_data_odd[cc_pos] = cc[0];
+		itv->vbi.cc_data_odd[cc_pos + 1] = cc[1];
+		itv->vbi.cc_data_even[cc_pos] = cc[2];
+		itv->vbi.cc_data_even[cc_pos + 1] = cc[3];
+		itv->vbi.cc_pos = cc_pos + 2;
+		set_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
+	}
+}
+
+static void copy_vbi_data(struct ivtv *itv, 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 = itv->vbi.frame % IVTV_VBI_FRAMES;
+	u8 *dst = &itv->vbi.sliced_mpeg_data[idx][0];
+
+	for (i = 0; i < lines; i++) {
+		int f, l;
+
+		if (itv->vbi.sliced_data[i].id == 0)
+			continue;
+
+		l = itv->vbi.sliced_data[i].line - 6;
+		f = itv->vbi.sliced_data[i].field;
+		if (f)
+			l += 18;
+		if (l < 32)
+			linemask[0] |= (1 << l);
+		else
+			linemask[1] |= (1 << (l - 32));
+		dst[sd + 12 + line * 43] = service2vbi(itv->vbi.sliced_data[i].id);
+		memcpy(dst + sd + 12 + line * 43 + 1, itv->vbi.sliced_data[i].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);
+	itv->vbi.sliced_mpeg_size[idx] = sd + size;
+}
+
+static int ivtv_convert_ivtv_vbi(struct ivtv *itv, u8 *p)
+{
+	u32 linemask[2];
+	int i, l, id2;
+	int line = 0;
+
+	if (!memcmp(p, "itv0", 4)) {
+		memcpy(linemask, p + 4, 8);
+		p += 12;
+	} else if (!memcmp(p, "ITV0", 4)) {
+		linemask[0] = 0xffffffff;
+		linemask[1] = 0xf;
+		p += 4;
+	} else {
+		/* unknown VBI data stream */
+		return 0;
+	}
+	for (i = 0; i < 36; i++) {
+		int err = 0;
+
+		if (i < 32 && !(linemask[0] & (1 << i)))
+			continue;
+		if (i >= 32 && !(linemask[1] & (1 << (i - 32))))
+			continue;
+		id2 = *p & 0xf;
+		switch (id2) {
+		case IVTV_SLICED_TYPE_TELETEXT_B:
+			id2 = V4L2_SLICED_TELETEXT_B;
+			break;
+		case IVTV_SLICED_TYPE_CAPTION_525:
+			id2 = V4L2_SLICED_CAPTION_525;
+			err = !odd_parity(p[1]) || !odd_parity(p[2]);
+			break;
+		case IVTV_SLICED_TYPE_VPS:
+			id2 = V4L2_SLICED_VPS;
+			break;
+		case IVTV_SLICED_TYPE_WSS_625:
+			id2 = V4L2_SLICED_WSS_625;
+			break;
+		default:
+			id2 = 0;
+			break;
+		}
+		if (err == 0) {
+			l = (i < 18) ? i + 6 : i - 18 + 6;
+			itv->vbi.sliced_dec_data[line].line = l;
+			itv->vbi.sliced_dec_data[line].field = i >= 18;
+			itv->vbi.sliced_dec_data[line].id = id2;
+			memcpy(itv->vbi.sliced_dec_data[line].data, p + 1, 42);
+			line++;
+		}
+		p += 43;
+	}
+	while (line < 36) {
+		itv->vbi.sliced_dec_data[line].id = 0;
+		itv->vbi.sliced_dec_data[line].line = 0;
+		itv->vbi.sliced_dec_data[line].field = 0;
+		line++;
+	}
+	return line * sizeof(itv->vbi.sliced_dec_data[0]);
+}
+
+ssize_t ivtv_write_vbi(struct ivtv *itv, const char __user *ubuf, size_t count)
+{
+	/* Should be a __user pointer, but sparse doesn't parse this bit correctly. */
+	const struct v4l2_sliced_vbi_data *p = (const struct v4l2_sliced_vbi_data *)ubuf;
+	u8 cc[4] = { 0x80, 0x80, 0x80, 0x80 };
+	int found_cc = 0;
+	int cc_pos = itv->vbi.cc_pos;
+
+	if (itv->vbi.service_set_out == 0)
+		return -EPERM;
+
+	while (count >= sizeof(struct v4l2_sliced_vbi_data)) {
+		switch (p->id) {
+		case V4L2_SLICED_CAPTION_525:
+			if (p->id == V4L2_SLICED_CAPTION_525 &&
+			    p->line == 21 &&
+			    (itv->vbi.service_set_out &
+				V4L2_SLICED_CAPTION_525) == 0) {
+				break;
+			}
+			found_cc = 1;
+			if (p->field) {
+				cc[2] = p->data[0];
+				cc[3] = p->data[1];
+			} else {
+				cc[0] = p->data[0];
+				cc[1] = p->data[1];
+			}
+			break;
+
+		case V4L2_SLICED_VPS:
+			if (p->line == 16 && p->field == 0 &&
+			    (itv->vbi.service_set_out & V4L2_SLICED_VPS)) {
+				itv->vbi.vps[0] = p->data[2];
+				itv->vbi.vps[1] = p->data[8];
+				itv->vbi.vps[2] = p->data[9];
+				itv->vbi.vps[3] = p->data[10];
+				itv->vbi.vps[4] = p->data[11];
+				itv->vbi.vps_found = 1;
+				set_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags);
+			}
+			break;
+
+		case V4L2_SLICED_WSS_625:
+			if (p->line == 23 && p->field == 0 &&
+			    (itv->vbi.service_set_out & V4L2_SLICED_WSS_625)) {
+				/* No lock needed for WSS */
+				itv->vbi.wss = p->data[0] | (p->data[1] << 8);
+				itv->vbi.wss_found = 1;
+				set_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags);
+			}
+			break;
+
+		default:
+			break;
+		}
+		count -= sizeof(*p);
+		p++;
+	}
+
+	if (found_cc && cc_pos < sizeof(itv->vbi.cc_data_even)) {
+		itv->vbi.cc_data_odd[cc_pos] = cc[0];
+		itv->vbi.cc_data_odd[cc_pos + 1] = cc[1];
+		itv->vbi.cc_data_even[cc_pos] = cc[2];
+		itv->vbi.cc_data_even[cc_pos + 1] = cc[3];
+		itv->vbi.cc_pos = cc_pos + 2;
+		set_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
+	}
+
+	return (const char __user *)p - ubuf;
+}
+
+/* Compress raw VBI format, removes leading SAV codes and surplus space after the
+   field.
+   Returns new compressed size. */
+static u32 compress_raw_buf(struct ivtv *itv, u8 *buf, u32 size)
+{
+	u32 line_size = itv->vbi.raw_decoder_line_size;
+	u32 lines = itv->vbi.count;
+	u8 sav1 = itv->vbi.raw_decoder_sav_odd_field;
+	u8 sav2 = itv->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 ivtv *itv, u32 line, u8 *buf, u32 size, u8 sav)
+{
+	u32 line_size = itv->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;
+		itv->video_dec_func(itv, VIDIOC_INT_DECODE_VBI_LINE, &vbi);
+		if (vbi.type) {
+			itv->vbi.sliced_data[line].id = vbi.type;
+			itv->vbi.sliced_data[line].field = vbi.is_second_field;
+			itv->vbi.sliced_data[line].line = vbi.line;
+			memcpy(itv->vbi.sliced_data[line].data, vbi.p, 42);
+			line++;
+		}
+	}
+	return line;
+}
+
+void ivtv_process_vbi_data(struct ivtv *itv, struct ivtv_buffer *buf,
+			   u64 pts_stamp, int streamtype)
+{
+	u8 *p = (u8 *) buf->buf;
+	u32 size = buf->bytesused;
+	int y;
+
+	/* Raw VBI data */
+	if (streamtype == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set == 0) {
+		u8 type;
+
+		ivtv_buf_swap(buf);
+
+		type = p[3];
+
+		size = buf->bytesused = compress_raw_buf(itv, p, size);
+
+		/* second field of the frame? */
+		if (type == itv->vbi.raw_decoder_sav_even_field) {
+			/* Dirty hack needed for backwards
+			   compatibility of old VBI software. */
+			p += size - 4;
+			memcpy(p, &itv->vbi.frame, 4);
+			itv->vbi.frame++;
+		}
+		return;
+	}
+
+	/* Sliced VBI data with data insertion */
+	if (streamtype == IVTV_ENC_STREAM_TYPE_VBI) {
+		int lines;
+
+		ivtv_buf_swap(buf);
+
+		/* first field */
+		lines = compress_sliced_buf(itv, 0, p, size / 2,
+			itv->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(itv, lines, p + size / 2 - 32, size / 2 + 32,
+			itv->vbi.sliced_decoder_sav_even_field);
+		/* always return at least one empty line */
+		if (lines == 0) {
+			itv->vbi.sliced_data[0].id = 0;
+			itv->vbi.sliced_data[0].line = 0;
+			itv->vbi.sliced_data[0].field = 0;
+			lines = 1;
+		}
+		buf->bytesused = size = lines * sizeof(itv->vbi.sliced_data[0]);
+		memcpy(p, &itv->vbi.sliced_data[0], size);
+
+		if (itv->vbi.insert_mpeg) {
+			copy_vbi_data(itv, lines, pts_stamp);
+		}
+		itv->vbi.frame++;
+		return;
+	}
+
+	/* Sliced VBI re-inserted from an MPEG stream */
+	if (streamtype == IVTV_DEC_STREAM_TYPE_VBI) {
+		/* If the size is not 4-byte aligned, then the starting address
+		   for the swapping is also shifted. After swapping the data the
+		   real start address of the VBI data is exactly 4 bytes after the
+		   original start. It's a bit fiddly but it works like a charm.
+		   Non-4-byte alignment happens when an lseek is done on the input
+		   mpeg file to a non-4-byte aligned position. So on arrival here
+		   the VBI data is also non-4-byte aligned. */
+		int offset = size & 3;
+		int cnt;
+
+		if (offset) {
+			p += 4 - offset;
+		}
+		/* Swap Buffer */
+		for (y = 0; y < size; y += 4) {
+		       swab32s((u32 *)(p + y));
+		}
+
+		cnt = ivtv_convert_ivtv_vbi(itv, p + offset);
+		memcpy(buf->buf, itv->vbi.sliced_dec_data, cnt);
+		buf->bytesused = cnt;
+
+		passthrough_vbi_data(itv, cnt / sizeof(itv->vbi.sliced_dec_data[0]));
+		return;
+	}
+}
+
+void ivtv_disable_vbi(struct ivtv *itv)
+{
+	clear_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags);
+	clear_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags);
+	clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
+	ivtv_set_wss(itv, 0, 0);
+	ivtv_set_cc(itv, 0, 0, 0, 0, 0);
+	ivtv_set_vps(itv, 0, 0, 0, 0, 0, 0);
+	itv->vbi.vps_found = itv->vbi.wss_found = 0;
+	itv->vbi.wss = 0;
+	itv->vbi.cc_pos = 0;
+}
+
+void vbi_work_handler(struct work_struct *work)
+{
+	struct vbi_info *info = container_of(work, struct vbi_info, work_queue);
+	struct ivtv *itv = container_of(info, struct ivtv, vbi);
+	struct v4l2_sliced_vbi_data data;
+	DEFINE_WAIT(wait);
+
+	/* Lock */
+	if (itv->output_mode == OUT_PASSTHROUGH) {
+		/* Note: currently only the saa7115 is used in a PVR350,
+		   so these commands are for now saa7115 specific. */
+		if (itv->is_50hz) {
+			data.id = V4L2_SLICED_WSS_625;
+			data.field = 0;
+
+			if (itv->video_dec_func(itv, VIDIOC_INT_G_VBI_DATA, &data) == 0) {
+				ivtv_set_wss(itv, 1, data.data[0] & 0xf);
+				itv->vbi.wss_no_update = 0;
+			} else if (itv->vbi.wss_no_update == 4) {
+				ivtv_set_wss(itv, 1, 0x8);  /* 4x3 full format */
+			} else {
+				itv->vbi.wss_no_update++;
+			}
+		}
+		else {
+			u8 c1 = 0, c2 = 0, c3 = 0, c4 = 0;
+			int mode = 0;
+
+			data.id = V4L2_SLICED_CAPTION_525;
+			data.field = 0;
+			if (itv->video_dec_func(itv, VIDIOC_INT_G_VBI_DATA, &data) == 0) {
+				mode |= 1;
+				c1 = data.data[0];
+				c2 = data.data[1];
+			}
+			data.field = 1;
+			if (itv->video_dec_func(itv, VIDIOC_INT_G_VBI_DATA, &data) == 0) {
+				mode |= 2;
+				c3 = data.data[0];
+				c4 = data.data[1];
+			}
+			if (mode) {
+				itv->vbi.cc_no_update = 0;
+				ivtv_set_cc(itv, mode, c1, c2, c3, c4);
+			} else if (itv->vbi.cc_no_update == 4) {
+				ivtv_set_cc(itv, 0, 0, 0, 0, 0);
+			} else {
+				itv->vbi.cc_no_update++;
+			}
+		}
+		return;
+	}
+
+	if (test_and_clear_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags)) {
+		/* Lock */
+		ivtv_set_wss(itv, itv->vbi.wss_found, itv->vbi.wss & 0xf);
+	}
+
+	if (test_and_clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags)) {
+		if (itv->vbi.cc_pos == 0) {
+			ivtv_set_cc(itv, 3, 0x80, 0x80, 0x80, 0x80);
+		}
+		while (itv->vbi.cc_pos) {
+			u8 cc_odd0 = itv->vbi.cc_data_odd[0];
+			u8 cc_odd1 = itv->vbi.cc_data_odd[1];
+			u8 cc_even0 = itv->vbi.cc_data_even[0];
+			u8 cc_even1 = itv->vbi.cc_data_even[1];
+
+			memcpy(itv->vbi.cc_data_odd, itv->vbi.cc_data_odd + 2, sizeof(itv->vbi.cc_data_odd) - 2);
+			memcpy(itv->vbi.cc_data_even, itv->vbi.cc_data_even + 2, sizeof(itv->vbi.cc_data_even) - 2);
+			itv->vbi.cc_pos -= 2;
+			if (itv->vbi.cc_pos && cc_odd0 == 0x80 && cc_odd1 == 0x80)
+				continue;
+
+			/* Send to Saa7127 */
+			ivtv_set_cc(itv, 3, cc_odd0, cc_odd1, cc_even0, cc_even1);
+			if (itv->vbi.cc_pos == 0)
+				set_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
+			break;
+		}
+	}
+
+	if (test_and_clear_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags)) {
+		/* Lock */
+		ivtv_set_vps(itv, itv->vbi.vps_found,
+			itv->vbi.vps[0], itv->vbi.vps[1],
+			itv->vbi.vps[2], itv->vbi.vps[3], itv->vbi.vps[4]);
+	}
+}