[FFmpeg-cvslog] bink: permute Bink version 'b' quant matrices by inverse scan order

[Peter Ross]

ffmpeg | branch: master | Peter Ross <pross at xvid.org> | Sun Feb 13 09:36:29 2011 +0000| [f20886e464874b246ae6acfea41f35c277b51752] | committer: Michael Niedermayer

bink: permute Bink version 'b' quant matrices by inverse scan order

This fixes visual glitches in Bink version 'b' files, as the quantization
tables were not being permuted.

Signed-off-by: Mans Rullgard <mans at mansr.com>
(cherry picked from commit 231539217431c32d4f22a16ee2834e24f54611f4)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f20886e464874b246ae6acfea41f35c277b51752
---

 libavcodec/bink.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/libavcodec/bink.c b/libavcodec/bink.c
index f13e1c7..95cfc92 100644
--- a/libavcodec/bink.c
+++ b/libavcodec/bink.c
@@ -1210,6 +1210,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
  */
 static av_cold void binkb_calc_quant()
 {
+    uint8_t inv_bink_scan[64];
     double s[64];
     int i, j;
 
@@ -1228,17 +1229,21 @@ static av_cold void binkb_calc_quant()
         }
     }
 
+    for (i = 0; i < 64; i++)
+        inv_bink_scan[bink_scan[i]] = i;
+
     for (j = 0; j < 16; j++) {
         for (i = 0; i < 64; i++) {
+            int k = inv_bink_scan[i];
             if (s[i] == 1.0) {
-                binkb_intra_quant[j][i] = (1L << 12) * binkb_intra_seed[i] *
+                binkb_intra_quant[j][k] = (1L << 12) * binkb_intra_seed[i] *
                                           binkb_num[j]/binkb_den[j];
-                binkb_inter_quant[j][i] = (1L << 12) * binkb_inter_seed[i] *
+                binkb_inter_quant[j][k] = (1L << 12) * binkb_inter_seed[i] *
                                           binkb_num[j]/binkb_den[j];
             } else {
-                binkb_intra_quant[j][i] = (1L << 12) * binkb_intra_seed[i] * s[i] *
+                binkb_intra_quant[j][k] = (1L << 12) * binkb_intra_seed[i] * s[i] *
                                           binkb_num[j]/(double)binkb_den[j];
-                binkb_inter_quant[j][i] = (1L << 12) * binkb_inter_seed[i] * s[i] *
+                binkb_inter_quant[j][k] = (1L << 12) * binkb_inter_seed[i] * s[i] *
                                           binkb_num[j]/(double)binkb_den[j];
             }
         }