Initial WebM release
diff --git a/vp8/encoder/boolhuff.c b/vp8/encoder/boolhuff.c
new file mode 100644
index 0000000..c101384
--- /dev/null
+++ b/vp8/encoder/boolhuff.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license and patent
+ * grant that can be found in the LICENSE file in the root of the source
+ * tree. All contributing project authors may be found in the AUTHORS
+ * file in the root of the source tree.
+ */
+
+
+#include "boolhuff.h"
+#include "blockd.h"
+
+
+
+#if defined(SECTIONBITS_OUTPUT)
+unsigned __int64 Sectionbits[500];
+
+#endif
+
+#ifdef ENTROPY_STATS
+unsigned int active_section = 0;
+#endif
+
+const unsigned int vp8_prob_cost[256] =
+{
+ 2047, 2047, 1791, 1641, 1535, 1452, 1385, 1328, 1279, 1235, 1196, 1161, 1129, 1099, 1072, 1046,
+ 1023, 1000, 979, 959, 940, 922, 905, 889, 873, 858, 843, 829, 816, 803, 790, 778,
+ 767, 755, 744, 733, 723, 713, 703, 693, 684, 675, 666, 657, 649, 641, 633, 625,
+ 617, 609, 602, 594, 587, 580, 573, 567, 560, 553, 547, 541, 534, 528, 522, 516,
+ 511, 505, 499, 494, 488, 483, 477, 472, 467, 462, 457, 452, 447, 442, 437, 433,
+ 428, 424, 419, 415, 410, 406, 401, 397, 393, 389, 385, 381, 377, 373, 369, 365,
+ 361, 357, 353, 349, 346, 342, 338, 335, 331, 328, 324, 321, 317, 314, 311, 307,
+ 304, 301, 297, 294, 291, 288, 285, 281, 278, 275, 272, 269, 266, 263, 260, 257,
+ 255, 252, 249, 246, 243, 240, 238, 235, 232, 229, 227, 224, 221, 219, 216, 214,
+ 211, 208, 206, 203, 201, 198, 196, 194, 191, 189, 186, 184, 181, 179, 177, 174,
+ 172, 170, 168, 165, 163, 161, 159, 156, 154, 152, 150, 148, 145, 143, 141, 139,
+ 137, 135, 133, 131, 129, 127, 125, 123, 121, 119, 117, 115, 113, 111, 109, 107,
+ 105, 103, 101, 99, 97, 95, 93, 92, 90, 88, 86, 84, 82, 81, 79, 77,
+ 75, 73, 72, 70, 68, 66, 65, 63, 61, 60, 58, 56, 55, 53, 51, 50,
+ 48, 46, 45, 43, 41, 40, 38, 37, 35, 33, 32, 30, 29, 27, 25, 24,
+ 22, 21, 19, 18, 16, 15, 13, 12, 10, 9, 7, 6, 4, 3, 1, 1
+};
+
+void vp8_start_encode(BOOL_CODER *br, unsigned char *source)
+{
+
+ br->lowvalue = 0;
+ br->range = 255;
+ br->value = 0;
+ br->count = -24;
+ br->buffer = source;
+ br->pos = 0;
+}
+
+void vp8_stop_encode(BOOL_CODER *br)
+{
+ int i;
+
+ for (i = 0; i < 32; i++)
+ vp8_encode_bool(br, 0, 128);
+}
+
+DECLARE_ALIGNED(16, static const unsigned int, norm[256]) =
+{
+ 0, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+void vp8_encode_bool(BOOL_CODER *br, int bit, int probability)
+{
+ unsigned int split;
+ int count = br->count;
+ unsigned int range = br->range;
+ unsigned int lowvalue = br->lowvalue;
+ register unsigned int shift;
+
+#ifdef ENTROPY_STATS
+#if defined(SECTIONBITS_OUTPUT)
+
+ if (bit)
+ Sectionbits[active_section] += vp8_prob_cost[255-probability];
+ else
+ Sectionbits[active_section] += vp8_prob_cost[probability];
+
+#endif
+#endif
+
+ split = 1 + (((range - 1) * probability) >> 8);
+
+ range = split;
+
+ if (bit)
+ {
+ lowvalue += split;
+ range = br->range - split;
+ }
+
+ shift = norm[range];
+
+ range <<= shift;
+ count += shift;
+
+ if (count >= 0)
+ {
+ int offset = shift - count;
+
+ if ((lowvalue << (offset - 1)) & 0x80000000)
+ {
+ int x = br->pos - 1;
+
+ while (x >= 0 && br->buffer[x] == 0xff)
+ {
+ br->buffer[x] = (unsigned char)0;
+ x--;
+ }
+
+ br->buffer[x] += 1;
+ }
+
+ br->buffer[br->pos++] = (lowvalue >> (24 - offset));
+ lowvalue <<= offset;
+ shift = count;
+ lowvalue &= 0xffffff;
+ count -= 8 ;
+ }
+
+ lowvalue <<= shift;
+ br->count = count;
+ br->lowvalue = lowvalue;
+ br->range = range;
+}
+
+void vp8_encode_value(BOOL_CODER *br, int data, int bits)
+{
+ int bit;
+
+ for (bit = bits - 1; bit >= 0; bit--)
+ vp8_encode_bool(br, (1 & (data >> bit)), 0x80);
+
+}
