michael@0: /*
michael@0:  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0:  *
michael@0:  *  Use of this source code is governed by a BSD-style license
michael@0:  *  that can be found in the LICENSE file in the root of the source
michael@0:  *  tree. An additional intellectual property rights grant can be found
michael@0:  *  in the file PATENTS.  All contributing project authors may
michael@0:  *  be found in the AUTHORS file in the root of the source tree.
michael@0:  */
michael@0: 
michael@0: #include <assert.h>
michael@0: #include "vp9/encoder/vp9_boolhuff.h"
michael@0: #include "vp9/common/vp9_entropy.h"
michael@0: 
michael@0: #if defined(SECTIONBITS_OUTPUT)
michael@0: unsigned __int64 Sectionbits[500];
michael@0: 
michael@0: #endif
michael@0: 
michael@0: #ifdef ENTROPY_STATS
michael@0: unsigned int active_section = 0;
michael@0: #endif
michael@0: 
michael@0: const unsigned int vp9_prob_cost[256] = {
michael@0:   2047, 2047, 1791, 1641, 1535, 1452, 1385, 1328, 1279, 1235, 1196, 1161,
michael@0:   1129, 1099, 1072, 1046, 1023, 1000, 979,  959,  940,  922,  905,  889,
michael@0:   873,  858,  843,  829,  816,  803,  790,  778,  767,  755,  744,  733,
michael@0:   723,  713,  703,  693,  684,  675,  666,  657,  649,  641,  633,  625,
michael@0:   617,  609,  602,  594,  587,  580,  573,  567,  560,  553,  547,  541,
michael@0:   534,  528,  522,  516,  511,  505,  499,  494,  488,  483,  477,  472,
michael@0:   467,  462,  457,  452,  447,  442,  437,  433,  428,  424,  419,  415,
michael@0:   410,  406,  401,  397,  393,  389,  385,  381,  377,  373,  369,  365,
michael@0:   361,  357,  353,  349,  346,  342,  338,  335,  331,  328,  324,  321,
michael@0:   317,  314,  311,  307,  304,  301,  297,  294,  291,  288,  285,  281,
michael@0:   278,  275,  272,  269,  266,  263,  260,  257,  255,  252,  249,  246,
michael@0:   243,  240,  238,  235,  232,  229,  227,  224,  221,  219,  216,  214,
michael@0:   211,  208,  206,  203,  201,  198,  196,  194,  191,  189,  186,  184,
michael@0:   181,  179,  177,  174,  172,  170,  168,  165,  163,  161,  159,  156,
michael@0:   154,  152,  150,  148,  145,  143,  141,  139,  137,  135,  133,  131,
michael@0:   129,  127,  125,  123,  121,  119,  117,  115,  113,  111,  109,  107,
michael@0:   105,  103,  101,  99,   97,   95,   93,   92,   90,   88,   86,   84,
michael@0:   82,   81,   79,   77,   75,   73,   72,   70,   68,   66,   65,   63,
michael@0:   61,   60,   58,   56,   55,   53,   51,   50,   48,   46,   45,   43,
michael@0:   41,   40,   38,   37,   35,   33,   32,   30,   29,   27,   25,   24,
michael@0:   22,   21,   19,   18,   16,   15,   13,   12,   10,   9,    7,    6,
michael@0:   4,    3,    1,    1};
michael@0: 
michael@0: void vp9_start_encode(vp9_writer *br, uint8_t *source) {
michael@0:   br->lowvalue = 0;
michael@0:   br->range    = 255;
michael@0:   br->value    = 0;
michael@0:   br->count    = -24;
michael@0:   br->buffer   = source;
michael@0:   br->pos      = 0;
michael@0:   vp9_write_bit(br, 0);
michael@0: }
michael@0: 
michael@0: void vp9_stop_encode(vp9_writer *br) {
michael@0:   int i;
michael@0: 
michael@0:   for (i = 0; i < 32; i++)
michael@0:     vp9_write_bit(br, 0);
michael@0: 
michael@0:   // Ensure there's no ambigous collision with any index marker bytes
michael@0:   if ((br->buffer[br->pos - 1] & 0xe0) == 0xc0)
michael@0:     br->buffer[br->pos++] = 0;
michael@0: }
michael@0: