Consider the following byte sequence
00 00 01 0a 00 00 00 01 09 ...
^ ^
A B
decode_nal() determines dst_length to be 1 (i. e. the byte between label
A and B above). However, this byte is a trailing zero byte as the spec
says the the current NAL unit is terminated by a byte sequence 00 00 00.
The current code used a loop to decrement dst_length accordingly. But the
loop doesn't start as the loop condition checks for dst_length > 1, which
should read dst_length > 0.
patch by Reinhard Nissl, rnissl gmx de
Originally committed as revision 8689 to svn://svn.ffmpeg.org/ffmpeg/trunk
if (ptr==NULL || dst_length < 0){
return -1;
}
- while(ptr[dst_length - 1] == 0 && dst_length > 1)
+ while(ptr[dst_length - 1] == 0 && dst_length > 0)
dst_length--;
bit_length= 8*dst_length - decode_rbsp_trailing(h, ptr + dst_length - 1);