shithub: libvpx

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reset segement map on key frame

This is to fix a decoder crash when decoder skips a number of frame to
continue decoding from a later key frame.

Change-Id: I3ba116eba6c3440e0528a21f53745f694302e4ad

--- a/vp9/decoder/vp9_decodframe.c

+++ b/vp9/decoder/vp9_decodframe.c

@@ -40,7 +40,7 @@

 #define COEFCOUNT_TESTING

-// #define DEC_DEBUG

+//#define DEC_DEBUG

 #ifdef DEC_DEBUG

 int dec_debug = 0;

 #endif

@@ -1311,7 +1311,10 @@

   MACROBLOCKD *const xd  = &pbi->mb;

   if (pc->frame_type == KEY_FRAME) {

-    /* Various keyframe initializations */

+

+    if (pc->last_frame_seg_map)

+      vpx_memset(pc->last_frame_seg_map, 0, (pc->mb_rows * pc->mb_cols));

+

     vp9_init_mv_probs(pc);

     vp9_init_mbmode_probs(pc);

@@ -1354,6 +1357,7 @@

     vp9_update_mode_info_border(pc, pc->mip);

     vp9_update_mode_info_in_image(pc, pc->mi);

+

   } else {

     if (!pc->use_bilinear_mc_filter)

@@ -1600,6 +1604,7 @@

     pc->ref_pred_probs[0] = 120;

     pc->ref_pred_probs[1] = 80;

     pc->ref_pred_probs[2] = 40;

+

   } else {

     for (i = 0; i < PREDICTION_PROBS; i++) {

       if (vp9_read_bit(&header_bc))

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -255,6 +255,9 @@

   vp9_init_mbmode_probs(& cpi->common);

   vp9_default_bmode_probs(cm->fc.bmode_prob);

+  if(cm->last_frame_seg_map)

+    vpx_memset(cm->last_frame_seg_map, 0, (cm->mb_rows * cm->mb_cols));

+

   vp9_init_mv_probs(& cpi->common);

   // cpi->common.filter_level = 0;      // Reset every key frame.

-- 

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