Implement revert_cdlms()

libavcodec/wmalosslessdec.c

@@ -873,6 +873,39 @@ static void use_normal_update_speed(WmallDecodeCtx *s, int ich)
     }
 }
 
+static void revert_cdlms(WmallDecodeCtx *s, int tile_size)
+{
+    int icoef, ich;
+    int32_t pred, channel_coeff;
+    int ilms, num_lms;
+
+    for (ich = 0; ich < s->num_channels; ich++) {
+        if (!s->is_channel_coded[ich])
+            continue;
+        for (icoef = 0; icoef < tile_size; icoef++) {
+            num_lms = s->cdlms_ttl[ich];
+            channel_coeff = s->channel_residues[ich][icoef];
+            if (icoef == s->transient_pos[ich]) {
+                s->transient[ich] = 1;
+                use_high_update_speed(s, ich);
+            }
+            for (ilms = num_lms; ilms >= 0; ilms--) {
+                pred = lms_predict(s, ich, ilms);
+                channel_coeff += pred;
+                lms_update(s, ich, ilms, channel_coeff, pred);
+            }
+            if (s->transient[ich]) {
+                --s->channel[ich].transient_counter;
+                if(!s->channel[ich].transient_counter)
+                    use_normal_update_speed(s, ich);
+            }
+            s->channel_coeffs[ich][icoef] = channel_coeff;
+        }
+    }
+}
+
+
+
 /**
  *@brief Decode a single subframe (block).
  *@param s codec context