shithub: libvpx

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ref: 7b2177ce9ca1c82d992decd75ca6de878ecc785f
parent: c6e9eb69352e43d8241cdbde212a6280065aa891
author: Adrian Grange <agrange@google.com>
date: Thu Aug 21 04:15:23 EDT 2014 

Fix bug 837 (Part 2): Handle increase in frame width

The case where frame width increases but the overall memory
size required to hold the mi arrays does not was not
handled.

Change-Id: I72e70b912a7d1766687ad682979f1c9ee124449b


--- a/vp9/decoder/vp9_decodeframe.c
+++ b/vp9/decoder/vp9_decodeframe.c
@@ -627,11 +627,12 @@
                        "Width and height beyond allowed size.");
 #endif
   if (cm->width != width || cm->height != height) {
-    const int new_rows = ALIGN_POWER_OF_TWO(height,
-                                            MI_SIZE_LOG2) >> MI_SIZE_LOG2;
-    const int new_cols = ALIGN_POWER_OF_TWO(width,
-                                            MI_SIZE_LOG2) >> MI_SIZE_LOG2;
-    if (calc_mi_size(new_rows) * calc_mi_size(new_cols) > cm->mi_alloc_size) {
+    const int new_mi_rows =
+        calc_mi_size(ALIGN_POWER_OF_TWO(height, MI_SIZE_LOG2) >> MI_SIZE_LOG2);
+    const int new_mi_cols =
+        calc_mi_size(ALIGN_POWER_OF_TWO(width,  MI_SIZE_LOG2) >> MI_SIZE_LOG2);
+    if (new_mi_cols > cm->mi_stride ||
+        (new_mi_rows * new_mi_cols > cm->mi_alloc_size)) {
       if (vp9_alloc_context_buffers(cm, width, height))
         vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                            "Failed to allocate context buffers");
-- 
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