V4L/DVB (6095): ivtv: fix VIDIOC_G_ENC_INDEX flag handling

Due to a documentation bug (the type mask is 3 bits long, not 2) the wrong
frame types were filled in: the B and P frame types were swapped.

This bug also hid a second bug: when a capture is stopped a last entry is
written into the pgm index buffer with internal type 0, denoting the end
of the program. This entry wasn't ignored, instead it was accidentally
returned to the caller as a P frame.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/Documentation/video4linux/cx2341x/fw-encoder-api.txt b/Documentation/video4linux/cx2341x/fw-encoder-api.txt
index 5dd3109a8b3f..5a27af2ee1c6 100644
--- a/Documentation/video4linux/cx2341x/fw-encoder-api.txt
+++ b/Documentation/video4linux/cx2341x/fw-encoder-api.txt
@@ -407,8 +407,10 @@ Description
                 u32 length;             // Length of this frame
                 u32 offset_low;         // Offset in the file of the
                 u32 offset_high;        // start of this frame
-                u32 mask1;              // Bits 0-1 are the type mask:
+                u32 mask1;              // Bits 0-2 are the type mask:
                                         // 1=I, 2=P, 4=B
+                                        // 0=End of Program Index, other fields
+                                        //   are invalid.
                 u32 pts;                // The PTS of the frame
                 u32 mask2;              // Bit 0 is bit 32 of the pts.
         };