1 files changed, 56 insertions, 0 deletions
diff --git a/src/demuxers/real_common.h b/src/demuxers/real_common.h
new file mode 100644
index 000000000..4945a65ff
--- /dev/null
+++ b/src/demuxers/real_common.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2008 the xine project
+ *
+ * This file is part of xine, a free video player.
+ *
+ * xine is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * xine 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+ */
+
+static inline void demux_real_sipro_swap (char buffer[], int bs)
+{
+  /* bs = nybbles per subpacket */
+  static const unsigned char sipr_swaps[38][2] = {
+    {0, 63}, {1, 22}, {2, 44}, {3, 90}, {5, 81}, {7, 31}, {8, 86}, {9, 58},
+    {10, 36}, {12, 68}, {13, 39}, {14, 73}, {15, 53}, {16, 69}, {17, 57},
+    {19, 88}, {20, 34}, {21, 71}, {24, 46}, {25, 94}, {26, 54}, {28, 75},
+    {29, 50}, {32, 70}, {33, 92}, {35, 74}, {38, 85}, {40, 56}, {42, 87},
+    {43, 65}, {45, 59}, {48, 79}, {49, 93}, {51, 89}, {55, 95}, {61, 76},
+    {67, 83}, {77, 80}
+  };
+  int n;
+
+  for (n = 0; n < 38; ++n)
+  {
+    int j;
+    int i = bs * sipr_swaps[n][0];
+    int o = bs * sipr_swaps[n][1];
+    /* swap nibbles of block 'i' with 'o'      TODO: optimize */
+    for (j = 0; j < bs; ++j)
+    {
+      int x = (i & 1) ? (buffer[i >> 1] >> 4) : (buffer[i >> 1] & 0x0F);
+      int y = (o & 1) ? (buffer[o >> 1] >> 4) : (buffer[o >> 1] & 0x0F);
+      if (o & 1)
+	buffer[o >> 1] = (buffer[o >> 1] & 0x0F) | (x << 4);
+      else
+	buffer[o >> 1] = (buffer[o >> 1] & 0xF0) | x;
+      if (i & 1)
+	buffer[i >> 1] = (buffer[i >> 1] & 0x0F) | (y << 4);
+      else
+	buffer[i >> 1] = (buffer[i >> 1] & 0xF0) | y;
+      ++i;
+      ++o;
+    }
+  }
+}