early-access version 1432

externals/ffmpeg/libavcodec/ffv1_template.c

@@ -0,0 +1,53 @@
+/*
+ * FFV1 codec
+ *
+ * Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ */
+
+static inline int RENAME(predict)(TYPE *src, TYPE *last)
+{
+    const int LT = last[-1];
+    const int T  = last[0];
+    const int L  = src[-1];
+
+    return mid_pred(L, L + T - LT, T);
+}
+
+static inline int RENAME(get_context)(PlaneContext *p, TYPE *src,
+                                      TYPE *last, TYPE *last2)
+{
+    const int LT = last[-1];
+    const int T  = last[0];
+    const int RT = last[1];
+    const int L  = src[-1];
+
+    if (p->quant_table[3][127] || p->quant_table[4][127]) {
+        const int TT = last2[0];
+        const int LL = src[-2];
+        return p->quant_table[0][(L - LT) & 0xFF] +
+               p->quant_table[1][(LT - T) & 0xFF] +
+               p->quant_table[2][(T - RT) & 0xFF] +
+               p->quant_table[3][(LL - L) & 0xFF] +
+               p->quant_table[4][(TT - T) & 0xFF];
+    } else
+        return p->quant_table[0][(L - LT) & 0xFF] +
+               p->quant_table[1][(LT - T) & 0xFF] +
+               p->quant_table[2][(T - RT) & 0xFF];
+}
+