Update num_mbs_left When mb_x is Reset.
When we reset the mb_x values, the num_mbs_left should also be
reset accordingly. Added the code for the same in
impeg2d_dec_pnb_mb_params. Also, there was nothing to do in p
frames when the first_mb was set to 1. Added code for setting
mb_x value and updating the num_mbs left similar to
"impeg2d_dec_pnb_mb_params" function.
Bug: 63874456
Test: run PoC through before/after ASAN build
Change-Id: I7a0bfc33e22c0e8cb93ff29198f30052f7f96546
diff --git a/decoder/impeg2d_pnb_pic.c b/decoder/impeg2d_pnb_pic.c
index 570f0d2..a3ae436 100644
--- a/decoder/impeg2d_pnb_pic.c
+++ b/decoder/impeg2d_pnb_pic.c
@@ -122,6 +122,33 @@
impeg2d_dec_skip_mbs(ps_dec, (UWORD16)(u2_mb_addr_incr - 1));
}
+ else
+ {
+
+ /****************************************************************/
+ /* Section 6.3.17 */
+ /* The first MB of a slice cannot be skipped */
+ /* But the mb_addr_incr can be > 1, because at the beginning of */
+ /* a slice, it indicates the offset from the last MB in the */
+ /* previous row. Hence for the first slice in a row, the */
+ /* mb_addr_incr needs to be 1. */
+ /****************************************************************/
+ /* MB_x is set to zero whenever MB_y changes. */
+ ps_dec->u2_mb_x = u2_mb_addr_incr - 1;
+ /* For error resilience */
+ ps_dec->u2_mb_x = MIN(ps_dec->u2_mb_x, (ps_dec->u2_num_horiz_mb - 1));
+ ps_dec->u2_num_mbs_left = ((ps_dec->u2_num_vert_mb - ps_dec->u2_mb_y)
+ * ps_dec->u2_num_horiz_mb) - ps_dec->u2_mb_x;
+
+ /****************************************************************/
+ /* mb_addr_incr is forced to 1 because in this decoder it is used */
+ /* more as an indicator of the number of MBs skipped than the */
+ /* as defined by the standard (Section 6.3.17) */
+ /****************************************************************/
+ u2_mb_addr_incr = 1;
+ ps_dec->u2_first_mb = 0;
+
+ }
}
u4_next_word = (UWORD16)impeg2d_bit_stream_nxt(ps_stream,16);
@@ -286,6 +313,8 @@
ps_dec->u2_mb_x = u2_mb_addr_incr - 1;
/* For error resilience */
ps_dec->u2_mb_x = MIN(ps_dec->u2_mb_x, (ps_dec->u2_num_horiz_mb - 1));
+ ps_dec->u2_num_mbs_left = ((ps_dec->u2_num_vert_mb - ps_dec->u2_mb_y)
+ * ps_dec->u2_num_horiz_mb) - ps_dec->u2_mb_x;
/****************************************************************/
/* mb_addr_incr is forced to 1 because in this decoder it is used */
