ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavcodec/vc1_pred.h

@@ -0,0 +1,59 @@
+/*
+ * VC-1 and WMV3 decoder
+ * Copyright (c) 2006-2007 Konstantin Shishkov
+ * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_VC1_PRED_H
+#define AVCODEC_VC1_PRED_H
+
+#include "vc1.h"
+#include "vc1data.h"
+
+void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,
+                    int mv1, int r_x, int r_y, uint8_t* is_intra,
+                    int pred_flag, int dir);
+void ff_vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,
+                          int mvn, int r_x, int r_y, uint8_t* is_intra,
+                          int dir);
+void ff_vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],
+                      int direct, int mvtype);
+void ff_vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y,
+                            int mv1, int *pred_flag);
+
+static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)
+{
+    int n = bfrac;
+
+#if B_FRACTION_DEN==256
+    if (inv)
+        n -= 256;
+    if (!qs)
+        return 2 * ((value * n + 255) >> 9);
+    return (value * n + 128) >> 8;
+#else
+    if (inv)
+        n -= B_FRACTION_DEN;
+    if (!qs)
+        return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));
+    return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;
+#endif
+}
+
+#endif /* AVCODEC_VC1_PRED_H */