1 files changed, 108 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp8/encoder/dct.c b/media/libvpx/libvpx/vp8/encoder/dct.c
new file mode 100644
index 0000000000..7d214eafb0
--- /dev/null
+++ b/media/libvpx/libvpx/vp8/encoder/dct.c
@@ -0,0 +1,108 @@
+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <math.h>
+
+#include "./vp8_rtcd.h"
+
+void vp8_short_fdct4x4_c(short *input, short *output, int pitch) {
+  int i;
+  int a1, b1, c1, d1;
+  short *ip = input;
+  short *op = output;
+
+  for (i = 0; i < 4; ++i) {
+    a1 = ((ip[0] + ip[3]) * 8);
+    b1 = ((ip[1] + ip[2]) * 8);
+    c1 = ((ip[1] - ip[2]) * 8);
+    d1 = ((ip[0] - ip[3]) * 8);
+
+    op[0] = a1 + b1;
+    op[2] = a1 - b1;
+
+    op[1] = (c1 * 2217 + d1 * 5352 + 14500) >> 12;
+    op[3] = (d1 * 2217 - c1 * 5352 + 7500) >> 12;
+
+    ip += pitch / 2;
+    op += 4;
+  }
+  ip = output;
+  op = output;
+  for (i = 0; i < 4; ++i) {
+    a1 = ip[0] + ip[12];
+    b1 = ip[4] + ip[8];
+    c1 = ip[4] - ip[8];
+    d1 = ip[0] - ip[12];
+
+    op[0] = (a1 + b1 + 7) >> 4;
+    op[8] = (a1 - b1 + 7) >> 4;
+
+    op[4] = ((c1 * 2217 + d1 * 5352 + 12000) >> 16) + (d1 != 0);
+    op[12] = (d1 * 2217 - c1 * 5352 + 51000) >> 16;
+
+    ip++;
+    op++;
+  }
+}
+
+void vp8_short_fdct8x4_c(short *input, short *output, int pitch) {
+  vp8_short_fdct4x4_c(input, output, pitch);
+  vp8_short_fdct4x4_c(input + 4, output + 16, pitch);
+}
+
+void vp8_short_walsh4x4_c(short *input, short *output, int pitch) {
+  int i;
+  int a1, b1, c1, d1;
+  int a2, b2, c2, d2;
+  short *ip = input;
+  short *op = output;
+
+  for (i = 0; i < 4; ++i) {
+    a1 = ((ip[0] + ip[2]) * 4);
+    d1 = ((ip[1] + ip[3]) * 4);
+    c1 = ((ip[1] - ip[3]) * 4);
+    b1 = ((ip[0] - ip[2]) * 4);
+
+    op[0] = a1 + d1 + (a1 != 0);
+    op[1] = b1 + c1;
+    op[2] = b1 - c1;
+    op[3] = a1 - d1;
+    ip += pitch / 2;
+    op += 4;
+  }
+
+  ip = output;
+  op = output;
+
+  for (i = 0; i < 4; ++i) {
+    a1 = ip[0] + ip[8];
+    d1 = ip[4] + ip[12];
+    c1 = ip[4] - ip[12];
+    b1 = ip[0] - ip[8];
+
+    a2 = a1 + d1;
+    b2 = b1 + c1;
+    c2 = b1 - c1;
+    d2 = a1 - d1;
+
+    a2 += a2 < 0;
+    b2 += b2 < 0;
+    c2 += c2 < 0;
+    d2 += d2 < 0;
+
+    op[0] = (a2 + 3) >> 3;
+    op[4] = (b2 + 3) >> 3;
+    op[8] = (c2 + 3) >> 3;
+    op[12] = (d2 + 3) >> 3;
+
+    ip++;
+    op++;
+  }
+}