V4L/DVB (10986): mr97310a: don't discard frame headers on stream output

Fix a bug where all frame headers were being discarded, instead of being part of the
stream output, on MR97310A cameras.

The frame headers contain information which may be useful in processing
the video output and therefore should be kept and not discarded.

A corresponding patch to the decompression algorithm in
libv4lconvert/mr97310a.c corrects the change in frame offset.
Signed-off-by: NTheodore Kilgore <kilgota@auburn.edu>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/mr97310a.c

@@ -29,9 +29,7 @@ MODULE_LICENSE("GPL");
 /* specific webcam descriptor */
 struct sd {
 	struct gspca_dev gspca_dev;  /* !! must be the first item */
-
 	u8 sof_read;
-	u8 header_read;
 };
 
 /* V4L2 controls supported by the driver */
@@ -285,7 +283,6 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 			__u8 *data,                   /* isoc packet */
 			int len)                      /* iso packet length */
 {
-	struct sd *sd = (struct sd *) gspca_dev;
 	unsigned char *sof;
 
 	sof = pac_find_sof(gspca_dev, data, len);
@@ -300,25 +297,12 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 			n = 0;
 		frame = gspca_frame_add(gspca_dev, LAST_PACKET, frame,
 					data, n);
-		sd->header_read = 0;
-		gspca_frame_add(gspca_dev, FIRST_PACKET, frame, NULL, 0);
+		/* Start next frame. */
+		gspca_frame_add(gspca_dev, FIRST_PACKET, frame,
+			pac_sof_marker, sizeof pac_sof_marker);
 		len -= sof - data;
 		data = sof;
 	}
-	if (sd->header_read < 7) {
-		int needed;
-
-		/* skip the rest of the header */
-		needed = 7 - sd->header_read;
-		if (len <= needed) {
-			sd->header_read += len;
-			return;
-		}
-		data += needed;
-		len -= needed;
-		sd->header_read = 7;
-	}
-
 	gspca_frame_add(gspca_dev, INTER_PACKET, frame, data, len);
 }