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media/libvpx/vp8/encoder/boolhuff.c@ac0c01689b40 (annotated)

media/libvpx/vp8/encoder/boolhuff.c

Thu, 15 Jan 2015 15:59:08 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 15 Jan 2015 15:59:08 +0100

branch

TOR_BUG_9701

changeset 10

ac0c01689b40

permissions

-rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/*
michael@0	2	* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0	3	*
michael@0	4	* Use of this source code is governed by a BSD-style license
michael@0	5	* that can be found in the LICENSE file in the root of the source
michael@0	6	* tree. An additional intellectual property rights grant can be found
michael@0	7	* in the file PATENTS. All contributing project authors may
michael@0	8	* be found in the AUTHORS file in the root of the source tree.
michael@0	9	*/
michael@0	10
michael@0	11
michael@0	12	#include "boolhuff.h"
michael@0	13
michael@0	14	#if defined(SECTIONBITS_OUTPUT)
michael@0	15	unsigned __int64 Sectionbits[500];
michael@0	16
michael@0	17	#endif
michael@0	18
michael@0	19	#ifdef VP8_ENTROPY_STATS
michael@0	20	unsigned int active_section = 0;
michael@0	21	#endif
michael@0	22
michael@0	23	const unsigned int vp8_prob_cost[256] =
michael@0	24	{
michael@0	25	2047, 2047, 1791, 1641, 1535, 1452, 1385, 1328, 1279, 1235, 1196, 1161, 1129, 1099, 1072, 1046,
michael@0	26	1023, 1000, 979, 959, 940, 922, 905, 889, 873, 858, 843, 829, 816, 803, 790, 778,
michael@0	27	767, 755, 744, 733, 723, 713, 703, 693, 684, 675, 666, 657, 649, 641, 633, 625,
michael@0	28	617, 609, 602, 594, 587, 580, 573, 567, 560, 553, 547, 541, 534, 528, 522, 516,
michael@0	29	511, 505, 499, 494, 488, 483, 477, 472, 467, 462, 457, 452, 447, 442, 437, 433,
michael@0	30	428, 424, 419, 415, 410, 406, 401, 397, 393, 389, 385, 381, 377, 373, 369, 365,
michael@0	31	361, 357, 353, 349, 346, 342, 338, 335, 331, 328, 324, 321, 317, 314, 311, 307,
michael@0	32	304, 301, 297, 294, 291, 288, 285, 281, 278, 275, 272, 269, 266, 263, 260, 257,
michael@0	33	255, 252, 249, 246, 243, 240, 238, 235, 232, 229, 227, 224, 221, 219, 216, 214,
michael@0	34	211, 208, 206, 203, 201, 198, 196, 194, 191, 189, 186, 184, 181, 179, 177, 174,
michael@0	35	172, 170, 168, 165, 163, 161, 159, 156, 154, 152, 150, 148, 145, 143, 141, 139,
michael@0	36	137, 135, 133, 131, 129, 127, 125, 123, 121, 119, 117, 115, 113, 111, 109, 107,
michael@0	37	105, 103, 101, 99, 97, 95, 93, 92, 90, 88, 86, 84, 82, 81, 79, 77,
michael@0	38	75, 73, 72, 70, 68, 66, 65, 63, 61, 60, 58, 56, 55, 53, 51, 50,
michael@0	39	48, 46, 45, 43, 41, 40, 38, 37, 35, 33, 32, 30, 29, 27, 25, 24,
michael@0	40	22, 21, 19, 18, 16, 15, 13, 12, 10, 9, 7, 6, 4, 3, 1, 1
michael@0	41	};
michael@0	42
michael@0	43	void vp8_start_encode(BOOL_CODER *br, unsigned char *source, unsigned char *source_end)
michael@0	44	{
michael@0	45
michael@0	46	br->lowvalue = 0;
michael@0	47	br->range = 255;
michael@0	48	br->count = -24;
michael@0	49	br->buffer = source;
michael@0	50	br->buffer_end = source_end;
michael@0	51	br->pos = 0;
michael@0	52	}
michael@0	53
michael@0	54	void vp8_stop_encode(BOOL_CODER *br)
michael@0	55	{
michael@0	56	int i;
michael@0	57
michael@0	58	for (i = 0; i < 32; i++)
michael@0	59	vp8_encode_bool(br, 0, 128);
michael@0	60	}
michael@0	61
michael@0	62
michael@0	63	void vp8_encode_value(BOOL_CODER *br, int data, int bits)
michael@0	64	{
michael@0	65	int bit;
michael@0	66
michael@0	67	for (bit = bits - 1; bit >= 0; bit--)
michael@0	68	vp8_encode_bool(br, (1 & (data >> bit)), 0x80);
michael@0	69
michael@0	70	}