libv4l: Skip unknown huffman codes in sonixb decompression

Priority: normal

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/lib/libv4lconvert/sn9c10x.c b/lib/libv4lconvert/sn9c10x.c
index 4ea526d..da070d4 100644 (file)
--- a/lib/libv4lconvert/sn9c10x.c
+++ b/lib/libv4lconvert/sn9c10x.c
@@ -38,9 +38,6 @@ typedef struct {
 static code_table_t table[256];
 static int init_done = 0;
 
-/* global variable */
-static int sonix_unknown = 0;
-
 /*
        sonix_decompress_init
        =====================
@@ -113,7 +110,6 @@ static void sonix_decompress_init(void)
                table[i].unk = unk;
        }
 
-       sonix_unknown = 0;
        init_done = 1;
 }
 
@@ -172,8 +168,10 @@ void v4lconvert_decode_sn9c10x(const unsigned char *inp, unsigned char *outp,
                        /* update bit position */
                        bitpos += table[code].len;
 
-                       /* update code statistics */
-                       sonix_unknown += table[code].unk;
+                       /* Skip unknown codes (most likely they indicate
+                          a change of the delta's the various codes encode) */
+                       if (table[code].unk)
+                               continue;
 
                        /* calculate pixel value */
                        val = table[code].val;