shithub: libvpx

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Casts to remove some warnings.

Added casts to remove warnings:
BUG=webm:1274

In regards to the safety of these casts they are of two types:-

- Normalized bits per (16x16) MB stored in a 32 bit int (This is safe as bits
per MB even with << 9 normalization cant overflow 32 bits. Even raw 12
bits hdr source even would only be  29 bits :- (4+4+12+9) and the encoder
imposes much stricter limits than this on max bit rate.

- Cast as part of variance calculations.  There is an internal cast up to 64 bit
for the Sum X Sum calculation, but after normalization dividing by the number
of points the result will always be <= the SSE value.

Change-Id: I4e700236ed83d6b2b1955e92e84c3b1978b9eaa0

--- a/vp9/encoder/vp9_aq_variance.c

+++ b/vp9/encoder/vp9_aq_variance.c

@@ -166,7 +166,7 @@

     aq_variance(x->plane[0].src.buf, x->plane[0].src.stride, vp9_64_zeros, 0,

                 bw, bh, &sse, &avg);

 #endif  // CONFIG_VP9_HIGHBITDEPTH

-    var = sse - (((int64_t)avg * avg) / (bw * bh));

+    var = sse - (unsigned int)(((int64_t)avg * avg) / (bw * bh));

     return (unsigned int)(((uint64_t)256 * var) / (bw * bh));

   } else {

 #if CONFIG_VP9_HIGHBITDEPTH

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -1788,7 +1788,10 @@

           d32[i].sum += d16[j]->sum;

         }

-        d32[i].var = d32[i].sse - (((int64_t)d32[i].sum * d32[i].sum) >> 10);

+        d32[i].var =

+            (unsigned int)(d32[i].sse -

+                           (unsigned int)(((int64_t)d32[i].sum * d32[i].sum) >>

+                                          10));

         index = coord_lookup[i * 4].row * mis + coord_lookup[i * 4].col;

         mi_8x8[index] = mi_upper_left + index;

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -1388,7 +1388,7 @@

     const double speed_term = 1.0 + 0.04 * oxcf->speed;

     double last_group_rate_err;

     const int target_norm_bits_per_mb =

-        ((uint64_t)target_rate << BPER_MB_NORMBITS) / active_mbs;

+        (int)(((uint64_t)target_rate << BPER_MB_NORMBITS) / active_mbs);

     int q;

     int is_svc_upper_layer = 0;

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -336,7 +336,7 @@

                  cpi->common.use_highbitdepth, bd,

 #endif

                  sse8x8, sum8x8, var8x8);

-  var = sse - (((int64_t)sum * sum) >> (bw + bh + 4));

+  var = sse - (unsigned int)(((int64_t)sum * sum) >> (bw + bh + 4));

   *var_y = var;

   *sse_y = sse;

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

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

@@ -529,7 +529,7 @@

   // Calculate required scaling factor based on target frame size and size of

   // frame produced using previous Q.

   target_bits_per_mb =

-      ((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs;

+      (int)(((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs);

   i = active_best_quality;

@@ -1253,8 +1253,8 @@

                                   rate_thresh_mult[rc->frame_size_selector]);

   // Target rate per SB64 (including partial SB64s.

-  rc->sb64_target_rate =

-      ((int64_t)rc->this_frame_target * 64 * 64) / (cm->width * cm->height);

+  rc->sb64_target_rate = (int)(((int64_t)rc->this_frame_target * 64 * 64) /

+                               (cm->width * cm->height));

 }

 static void update_alt_ref_frame_stats(VP9_COMP *cpi) {

@@ -2322,7 +2322,8 @@

     cpi->rc.rc_1_frame = 0;

     cpi->rc.rc_2_frame = 0;

     // Adjust rate correction factor.

-    target_bits_per_mb = ((uint64_t)target_size << BPER_MB_NORMBITS) / cm->MBs;

+    target_bits_per_mb =

+        (int)(((uint64_t)target_size << BPER_MB_NORMBITS) / cm->MBs);

     // Rate correction factor based on target_bits_per_mb and qp (==max_QP).

     // This comes from the inverse computation of vp9_rc_bits_per_mb().

     q2 = vp9_convert_qindex_to_q(*q, cm->bit_depth);

-- 

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