shithub: libvpx

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Use the updated best rd cost for transform block search

The compression performance change is +/-0.01% for both speed 0/1.
Locally tested the encoding speed:

ped_1080p 150 frames speed 0
79544 b/f 41.339 dB 503072 ms ->
79566 b/f 41.338 dB 493009 ms.

speed 1
79789 b/f 41.152 dB 104583 ms ->
79770 b/f 41.153 dB 102607 ms

Change-Id: Ief200b613608643e5708cebe979982eb4a84831b

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -847,7 +847,7 @@

                               { INT64_MAX, INT64_MAX } };

   int n;

   int s0, s1;

-  int64_t best_rd = INT64_MAX;

+  int64_t best_rd = ref_best_rd;

   TX_SIZE best_tx = max_tx_size;

   int start_tx, end_tx;

   const int tx_size_ctx = get_tx_size_context(xd);

@@ -868,8 +868,8 @@

   for (n = start_tx; n >= end_tx; n--) {

     const int r_tx_size = cpi->tx_size_cost[max_tx_size - 1][tx_size_ctx][n];

-    txfm_rd_in_plane(cpi, x, &r[n][0], &d[n], &s[n], &sse[n], ref_best_rd, 0,

-                     bs, n, cpi->sf.use_fast_coef_costing);

+    txfm_rd_in_plane(cpi, x, &r[n][0], &d[n], &s[n], &sse[n], best_rd, 0, bs, n,

+                     cpi->sf.use_fast_coef_costing);

     r[n][1] = r[n][0];

     if (r[n][0] < INT_MAX) {

       r[n][1] += r_tx_size;