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path: root/drivers/media/pci/cx18/cx18-vbi.c
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Diffstat (limited to 'drivers/media/pci/cx18/cx18-vbi.c')
-rw-r--r--drivers/media/pci/cx18/cx18-vbi.c263
1 files changed, 263 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 000000000..c7cce38dd
--- /dev/null
+++ b/drivers/media/pci/cx18/cx18-vbi.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * cx18 Vertical Blank Interval support functions
+ *
+ * Derived from ivtv-vbi.c
+ *
+ * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
+ */
+
+#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 digital 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);
+ }
+}