1 files changed, 82 insertions, 0 deletions
diff --git a/libavcodec/takdsp.c b/libavcodec/takdsp.c
new file mode 100644
index 0000000..2441c2b
--- /dev/null
+++ b/libavcodec/takdsp.c
@@ -0,0 +1,82 @@
+/*
+ * TAK decoder
+ * Copyright (c) 2015 Paul B Mahol
+ *
+ * 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
+ */
+
+#include "libavutil/attributes.h"
+#include "takdsp.h"
+#include "config.h"
+
+static void decorrelate_ls(int32_t *p1, int32_t *p2, int length)
+{
+    int i;
+
+    for (i = 0; i < length; i++) {
+        int32_t a = p1[i];
+        int32_t b = p2[i];
+        p2[i]     = a + b;
+    }
+}
+
+static void decorrelate_sr(int32_t *p1, int32_t *p2, int length)
+{
+    int i;
+
+    for (i = 0; i < length; i++) {
+        int32_t a = p1[i];
+        int32_t b = p2[i];
+        p1[i]     = b - a;
+    }
+}
+
+static void decorrelate_sm(int32_t *p1, int32_t *p2, int length)
+{
+    int i;
+
+    for (i = 0; i < length; i++) {
+        int32_t a = p1[i];
+        int32_t b = p2[i];
+        a        -= b >> 1;
+        p1[i]     = a;
+        p2[i]     = a + b;
+    }
+}
+
+static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int dfactor)
+{
+    int i;
+
+    for (i = 0; i < length; i++) {
+        int32_t a = p1[i];
+        int32_t b = p2[i];
+        b         = dfactor * (b >> dshift) + 128 >> 8 << dshift;
+        p1[i]     = b - a;
+    }
+}
+
+av_cold void ff_takdsp_init(TAKDSPContext *c)
+{
+    c->decorrelate_ls = decorrelate_ls;
+    c->decorrelate_sr = decorrelate_sr;
+    c->decorrelate_sm = decorrelate_sm;
+    c->decorrelate_sf = decorrelate_sf;
+
+    if (ARCH_X86)
+        ff_takdsp_init_x86(c);
+}