V4L/DVB (11622): cx18: Allow IVTV format VBI insertion in MPEG-2 SVCD and DVD streams

Both the MPEG-2 SVCD stream format and the MPEG-2 DVD stream format should
use an MPEG-2 PS container.  This makes it safe to stuff IVTV Private Stream 1
VBI packets in these stream types using the existing cx18 driver routines.

Reported-by: Helen Buus <mythtv@hbuus.com>
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 10 insertions, 3 deletions

diff --git a/drivers/media/video/cx18/cx18-controls.c b/drivers/media/video/cx18/cx18-controls.c
index 82fc2f9d4021..8e35c3aed544 100644
--- a/drivers/media/video/cx18/cx18-controls.c
+++ b/drivers/media/video/cx18/cx18-controls.c
@@ -176,8 +176,10 @@ static int cx18_setup_vbi_fmt(struct cx18 *cx,
                 return -EBUSY;
 
         if (fmt != V4L2_MPEG_STREAM_VBI_FMT_IVTV ||
-            type != V4L2_MPEG_STREAM_TYPE_MPEG2_PS) {
-                /* We don't do VBI insertion aside from IVTV format in a PS */
+            !(type == V4L2_MPEG_STREAM_TYPE_MPEG2_PS ||
+              type == V4L2_MPEG_STREAM_TYPE_MPEG2_DVD ||
+              type == V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD)) {
+                /* Only IVTV fmt VBI insertion & only MPEG-2 PS type streams */
                 cx->vbi.insert_mpeg = V4L2_MPEG_STREAM_VBI_FMT_NONE;
                 CX18_DEBUG_INFO("disabled insertion of sliced VBI data into "
                                 "the MPEG stream\n");
diff --git a/drivers/media/video/cx18/cx18-fileops.c b/drivers/media/video/cx18/cx18-fileops.c
index b3889c0b2697..29969c18949c 100644
--- a/drivers/media/video/cx18/cx18-fileops.c
+++ b/drivers/media/video/cx18/cx18-fileops.c
@@ -265,8 +265,13 @@ static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
                  * an MPEG-2 Program Pack start code, and provide only
                  * up to that point to the user, so it's easy to insert VBI data
                  * the next time around.
+                 *
+                 * This will not work for an MPEG-2 TS and has only been
+                 * verified by analysis to work for an MPEG-2 PS.  Helen Buus
+                 * pointed out this works for the CX23416 MPEG-2 DVD compatible
+                 * stream, and research indicates both the MPEG 2 SVCD and DVD
+                 * stream types use an MPEG-2 PS container.
                  */
-                /* FIXME - This only works for an MPEG-2 PS, not a TS */
                 /*
                  * An MPEG-2 Program Stream (PS) is a series of
                  * MPEG-2 Program Packs terminated by an