2003-04-04 17:42:28 +03:00
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/*
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* exp golomb vlc stuff
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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2004-09-08 20:59:22 +03:00
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* Copyright (c) 2004 Alex Beregszaszi
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2003-04-04 17:42:28 +03:00
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*
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2006-10-07 18:30:46 +03:00
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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2003-04-04 17:42:28 +03:00
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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2006-10-07 18:30:46 +03:00
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* version 2.1 of the License, or (at your option) any later version.
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2003-04-04 17:42:28 +03:00
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*
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2006-10-07 18:30:46 +03:00
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* FFmpeg is distributed in the hope that it will be useful,
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2003-04-04 17:42:28 +03:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2006-10-07 18:30:46 +03:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-13 00:43:26 +02:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2003-04-04 17:42:28 +03:00
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*/
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2005-12-17 20:14:38 +02:00
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2003-04-04 17:42:28 +03:00
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/**
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2010-04-20 17:45:34 +03:00
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* @file
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2005-12-17 20:14:38 +02:00
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* @brief
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2003-04-04 17:42:28 +03:00
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* exp golomb vlc stuff
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2004-09-08 20:59:22 +03:00
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* @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
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2003-04-04 17:42:28 +03:00
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*/
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2008-08-31 10:39:47 +03:00
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#ifndef AVCODEC_GOLOMB_H
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#define AVCODEC_GOLOMB_H
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2007-06-17 03:01:30 +03:00
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2007-06-17 01:59:13 +03:00
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#include <stdint.h>
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2013-10-22 14:12:49 +03:00
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2009-04-13 19:20:26 +03:00
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#include "get_bits.h"
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2009-04-12 11:35:26 +03:00
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#include "put_bits.h"
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2007-06-17 01:59:13 +03:00
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2003-05-10 01:16:14 +03:00
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#define INVALID_VLC 0x80000000
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2003-04-04 17:42:28 +03:00
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extern const uint8_t ff_golomb_vlc_len[512];
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extern const uint8_t ff_ue_golomb_vlc_code[512];
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extern const int8_t ff_se_golomb_vlc_code[512];
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extern const uint8_t ff_ue_golomb_len[256];
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2003-05-13 03:46:42 +03:00
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extern const uint8_t ff_interleaved_golomb_vlc_len[256];
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extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];
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extern const int8_t ff_interleaved_se_golomb_vlc_code[256];
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2007-08-15 15:59:27 +03:00
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extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256];
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2003-05-13 03:46:42 +03:00
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2013-10-22 14:12:49 +03:00
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/**
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2015-12-29 09:04:08 +02:00
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* Read an unsigned Exp-Golomb code in the range 0 to 8190.
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2019-06-30 17:54:45 +02:00
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*
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* @returns the read value or a negative error code.
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2003-04-04 17:42:28 +03:00
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*/
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2013-10-22 14:12:49 +03:00
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static inline int get_ue_golomb(GetBitContext *gb)
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{
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2003-04-04 17:42:28 +03:00
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unsigned int buf;
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2005-12-17 20:14:38 +02:00
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2018-08-30 22:36:55 +02:00
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#if CACHED_BITSTREAM_READER
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2017-07-07 16:56:10 +02:00
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buf = show_bits_long(gb, 32);
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if (buf >= (1 << 27)) {
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buf >>= 32 - 9;
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skip_bits_long(gb, ff_golomb_vlc_len[buf]);
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return ff_ue_golomb_vlc_code[buf];
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} else {
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int log = 2 * av_log2(buf) - 31;
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buf >>= log;
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buf--;
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skip_bits_long(gb, 32 - log);
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return buf;
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}
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#else
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2003-04-04 17:42:28 +03:00
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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2013-10-22 14:12:49 +03:00
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buf = GET_CACHE(re, gb);
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2005-12-17 20:14:38 +02:00
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2013-10-22 14:12:49 +03:00
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if (buf >= (1 << 27)) {
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2003-04-04 17:42:28 +03:00
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buf >>= 32 - 9;
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LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
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CLOSE_READER(re, gb);
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2005-12-17 20:14:38 +02:00
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2003-04-04 17:42:28 +03:00
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return ff_ue_golomb_vlc_code[buf];
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2013-10-22 14:12:49 +03:00
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} else {
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2013-10-23 16:43:19 +03:00
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int log = 2 * av_log2(buf) - 31;
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2003-04-04 17:42:28 +03:00
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LAST_SKIP_BITS(re, gb, 32 - log);
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CLOSE_READER(re, gb);
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golomb: always check for invalid UE golomb codes in get_ue_golomb
Also correct the check to reject log < 7, because UPDATE_CACHE only
guarantees 25 meaningful bits.
This fixes undefined behavior:
runtime error: shift exponent is negative
Testing with START/STOP timers in get_ue_golomb, one for the first
branch (A) and one for the second (B), shows that there is practically no
slowdown, e.g. for the cavs decoder:
With the check in the B branch:
629 decicycles in get_ue_golomb B, 4194260 runs, 44 skips
433 decicycles in get_ue_golomb A,268434102 runs, 1354 skips
Without the check:
624 decicycles in get_ue_golomb B, 4194273 runs, 31 skips
433 decicycles in get_ue_golomb A,268434203 runs, 1253 skips
Since the B branch is executed far less often than the A branch, this
change is negligible, even more so for the h264 decoder, where the ratio
B/A is a lot smaller.
Fixes: mozilla bug 1230239
Fixes: fbeb8b2c7c996e9b91c6b1af319d7ebc/asan_heap-oob_195450f_2743_e8856ece4579ea486670be2b236099a0.bit
Found-by: Tyson Smith
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
2015-12-13 22:02:16 +02:00
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if (log < 7) {
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2014-12-05 21:27:04 +02:00
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av_log(NULL, AV_LOG_ERROR, "Invalid UE golomb code\n");
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2013-01-13 00:14:25 +03:00
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return AVERROR_INVALIDDATA;
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}
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2013-10-23 20:45:07 +03:00
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buf >>= log;
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2013-01-13 00:14:25 +03:00
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buf--;
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2005-12-17 20:14:38 +02:00
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2003-04-04 17:42:28 +03:00
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return buf;
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}
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2017-07-07 16:56:10 +02:00
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#endif
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2003-04-04 17:42:28 +03:00
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}
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2011-10-11 18:00:21 +03:00
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/**
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* Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1.
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*/
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static inline unsigned get_ue_golomb_long(GetBitContext *gb)
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{
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unsigned buf, log;
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buf = show_bits_long(gb, 32);
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log = 31 - av_log2(buf);
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skip_bits_long(gb, log);
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return get_bits_long(gb, log + 1) - 1;
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}
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2013-10-22 14:12:49 +03:00
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/**
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2009-02-18 13:57:11 +02:00
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* read unsigned exp golomb code, constraint to a max of 31.
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* the return value is undefined if the stored value exceeds 31.
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2008-12-23 23:05:47 +02:00
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*/
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2013-10-22 14:12:49 +03:00
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static inline int get_ue_golomb_31(GetBitContext *gb)
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{
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2008-12-23 23:05:47 +02:00
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unsigned int buf;
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2018-08-30 22:36:55 +02:00
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#if CACHED_BITSTREAM_READER
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2017-07-07 16:56:10 +02:00
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buf = show_bits_long(gb, 32);
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buf >>= 32 - 9;
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skip_bits_long(gb, ff_golomb_vlc_len[buf]);
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#else
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2008-12-23 23:05:47 +02:00
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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2013-10-22 14:12:49 +03:00
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buf = GET_CACHE(re, gb);
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2008-12-23 23:05:47 +02:00
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buf >>= 32 - 9;
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LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
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CLOSE_READER(re, gb);
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2017-07-07 16:56:10 +02:00
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#endif
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2008-12-23 23:05:47 +02:00
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return ff_ue_golomb_vlc_code[buf];
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}
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2016-05-24 01:20:34 +02:00
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static inline unsigned get_interleaved_ue_golomb(GetBitContext *gb)
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2012-11-30 17:00:47 +03:00
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{
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2003-05-13 03:46:42 +03:00
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uint32_t buf;
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2003-05-10 01:16:14 +03:00
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2018-08-30 22:36:55 +02:00
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#if CACHED_BITSTREAM_READER
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2017-07-07 16:56:10 +02:00
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buf = show_bits_long(gb, 32);
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if (buf & 0xAA800000) {
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buf >>= 32 - 8;
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skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]);
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return ff_interleaved_ue_golomb_vlc_code[buf];
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} else {
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unsigned ret = 1;
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do {
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buf >>= 32 - 8;
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skip_bits_long(gb, FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
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if (ff_interleaved_golomb_vlc_len[buf] != 9) {
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ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1;
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ret |= ff_interleaved_dirac_golomb_vlc_code[buf];
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break;
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}
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ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
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buf = show_bits_long(gb, 32);
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} while (get_bits_left(gb) > 0);
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return ret - 1;
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}
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#else
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2003-05-10 01:16:14 +03:00
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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2013-10-22 14:12:49 +03:00
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buf = GET_CACHE(re, gb);
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2005-12-17 20:14:38 +02:00
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2013-10-22 14:12:49 +03:00
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if (buf & 0xAA800000) {
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2003-05-13 03:46:42 +03:00
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buf >>= 32 - 8;
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LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
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CLOSE_READER(re, gb);
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2005-12-17 20:14:38 +02:00
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2003-05-13 03:46:42 +03:00
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return ff_interleaved_ue_golomb_vlc_code[buf];
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2013-10-22 14:12:49 +03:00
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} else {
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2012-11-30 17:00:47 +03:00
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unsigned ret = 1;
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2007-08-15 15:59:27 +03:00
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2011-12-25 06:15:56 +03:00
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do {
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2007-08-15 15:59:27 +03:00
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buf >>= 32 - 8;
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2013-10-22 14:12:49 +03:00
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LAST_SKIP_BITS(re, gb,
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FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
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2007-08-15 15:59:27 +03:00
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2013-10-22 14:12:49 +03:00
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if (ff_interleaved_golomb_vlc_len[buf] != 9) {
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2007-08-15 15:59:27 +03:00
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ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1;
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2013-10-22 14:12:49 +03:00
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ret |= ff_interleaved_dirac_golomb_vlc_code[buf];
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2007-08-15 15:59:27 +03:00
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break;
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}
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ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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2014-09-02 23:18:12 +03:00
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} while (ret<0x8000000U && BITS_AVAILABLE(re, gb));
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2003-05-10 01:16:14 +03:00
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2003-05-13 03:46:42 +03:00
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CLOSE_READER(re, gb);
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2007-08-15 15:59:27 +03:00
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return ret - 1;
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2003-05-13 03:46:42 +03:00
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}
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2017-07-07 16:56:10 +02:00
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#endif
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2003-05-10 01:16:14 +03:00
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}
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2003-04-04 17:42:28 +03:00
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/**
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* read unsigned truncated exp golomb code.
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*/
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2013-10-22 14:12:49 +03:00
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static inline int get_te0_golomb(GetBitContext *gb, int range)
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{
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2012-06-06 21:13:17 +03:00
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av_assert2(range >= 1);
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2005-12-17 20:14:38 +02:00
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2013-10-22 14:12:49 +03:00
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if (range == 1)
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return 0;
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else if (range == 2)
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return get_bits1(gb) ^ 1;
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else
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return get_ue_golomb(gb);
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2003-04-04 17:42:28 +03:00
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}
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/**
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* read unsigned truncated exp golomb code.
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*/
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2013-10-22 14:12:49 +03:00
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static inline int get_te_golomb(GetBitContext *gb, int range)
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{
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2012-06-06 21:13:17 +03:00
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av_assert2(range >= 1);
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2005-12-17 20:14:38 +02:00
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2013-10-22 14:12:49 +03:00
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if (range == 2)
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return get_bits1(gb) ^ 1;
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else
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return get_ue_golomb(gb);
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2003-04-04 17:42:28 +03:00
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}
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/**
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* read signed exp golomb code.
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*/
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2013-10-22 14:12:49 +03:00
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static inline int get_se_golomb(GetBitContext *gb)
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{
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2003-04-04 17:42:28 +03:00
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unsigned int buf;
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2005-12-17 20:14:38 +02:00
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2018-08-30 22:36:55 +02:00
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#if CACHED_BITSTREAM_READER
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2017-07-07 16:56:10 +02:00
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buf = show_bits_long(gb, 32);
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if (buf >= (1 << 27)) {
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buf >>= 32 - 9;
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skip_bits_long(gb, ff_golomb_vlc_len[buf]);
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return ff_se_golomb_vlc_code[buf];
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} else {
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int log = 2 * av_log2(buf) - 31;
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buf >>= log;
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skip_bits_long(gb, 32 - log);
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if (buf & 1)
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buf = -(buf >> 1);
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else
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buf = (buf >> 1);
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return buf;
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}
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#else
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2003-04-04 17:42:28 +03:00
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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2013-10-22 14:12:49 +03:00
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buf = GET_CACHE(re, gb);
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2005-12-17 20:14:38 +02:00
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2013-10-22 14:12:49 +03:00
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if (buf >= (1 << 27)) {
|
2003-04-04 17:42:28 +03:00
|
|
|
buf >>= 32 - 9;
|
|
|
|
LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
|
|
|
|
CLOSE_READER(re, gb);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2003-04-04 17:42:28 +03:00
|
|
|
return ff_se_golomb_vlc_code[buf];
|
2013-10-22 14:12:49 +03:00
|
|
|
} else {
|
2015-02-13 18:58:58 +02:00
|
|
|
int log = av_log2(buf), sign;
|
2013-02-09 02:43:30 +03:00
|
|
|
LAST_SKIP_BITS(re, gb, 31 - log);
|
|
|
|
UPDATE_CACHE(re, gb);
|
|
|
|
buf = GET_CACHE(re, gb);
|
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
buf >>= log;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2003-04-04 17:42:28 +03:00
|
|
|
LAST_SKIP_BITS(re, gb, 32 - log);
|
|
|
|
CLOSE_READER(re, gb);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2015-02-13 18:58:58 +02:00
|
|
|
sign = -(buf & 1);
|
|
|
|
buf = ((buf >> 1) ^ sign) - sign;
|
2003-04-04 17:42:28 +03:00
|
|
|
|
|
|
|
return buf;
|
|
|
|
}
|
2017-07-07 16:56:10 +02:00
|
|
|
#endif
|
2003-04-04 17:42:28 +03:00
|
|
|
}
|
|
|
|
|
2014-03-10 12:57:51 +03:00
|
|
|
static inline int get_se_golomb_long(GetBitContext *gb)
|
|
|
|
{
|
|
|
|
unsigned int buf = get_ue_golomb_long(gb);
|
2015-03-07 17:42:05 +02:00
|
|
|
int sign = (buf & 1) - 1;
|
2015-02-13 18:58:58 +02:00
|
|
|
return ((buf >> 1) ^ sign) + 1;
|
2014-03-10 12:57:51 +03:00
|
|
|
}
|
|
|
|
|
2016-05-24 01:20:34 +02:00
|
|
|
static inline int get_interleaved_se_golomb(GetBitContext *gb)
|
2013-10-22 14:12:49 +03:00
|
|
|
{
|
2003-05-10 01:16:14 +03:00
|
|
|
unsigned int buf;
|
|
|
|
|
2018-08-30 22:36:55 +02:00
|
|
|
#if CACHED_BITSTREAM_READER
|
2017-07-07 16:56:10 +02:00
|
|
|
buf = show_bits_long(gb, 32);
|
|
|
|
|
|
|
|
if (buf & 0xAA800000) {
|
|
|
|
buf >>= 32 - 8;
|
|
|
|
skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]);
|
|
|
|
|
|
|
|
return ff_interleaved_se_golomb_vlc_code[buf];
|
|
|
|
} else {
|
|
|
|
int log;
|
|
|
|
skip_bits(gb, 8);
|
2019-11-24 16:05:24 +02:00
|
|
|
buf |= 1 | show_bits(gb, 24);
|
2017-07-07 16:56:10 +02:00
|
|
|
|
|
|
|
if ((buf & 0xAAAAAAAA) == 0)
|
|
|
|
return INVALID_VLC;
|
|
|
|
|
|
|
|
for (log = 31; (buf & 0x80000000) == 0; log--)
|
|
|
|
buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
|
|
|
|
|
|
|
|
skip_bits_long(gb, 63 - 2 * log - 8);
|
|
|
|
|
|
|
|
return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
|
|
|
|
}
|
|
|
|
#else
|
2003-05-10 01:16:14 +03:00
|
|
|
OPEN_READER(re, gb);
|
|
|
|
UPDATE_CACHE(re, gb);
|
2013-10-22 14:12:49 +03:00
|
|
|
buf = GET_CACHE(re, gb);
|
2003-05-10 01:16:14 +03:00
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
if (buf & 0xAA800000) {
|
2003-05-13 03:46:42 +03:00
|
|
|
buf >>= 32 - 8;
|
|
|
|
LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
|
|
|
|
CLOSE_READER(re, gb);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2003-05-13 03:46:42 +03:00
|
|
|
return ff_interleaved_se_golomb_vlc_code[buf];
|
2013-10-22 14:12:49 +03:00
|
|
|
} else {
|
2013-10-23 16:43:19 +03:00
|
|
|
int log;
|
2005-01-19 15:03:38 +02:00
|
|
|
LAST_SKIP_BITS(re, gb, 8);
|
|
|
|
UPDATE_CACHE(re, gb);
|
|
|
|
buf |= 1 | (GET_CACHE(re, gb) >> 8);
|
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
if ((buf & 0xAAAAAAAA) == 0)
|
2003-05-13 03:46:42 +03:00
|
|
|
return INVALID_VLC;
|
2003-05-10 01:16:14 +03:00
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
for (log = 31; (buf & 0x80000000) == 0; log--)
|
2003-05-13 03:46:42 +03:00
|
|
|
buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
|
2003-05-10 01:16:14 +03:00
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8);
|
2003-05-13 03:46:42 +03:00
|
|
|
CLOSE_READER(re, gb);
|
2003-05-10 01:16:14 +03:00
|
|
|
|
2003-05-13 03:46:42 +03:00
|
|
|
return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
|
|
|
|
}
|
2017-07-07 16:56:10 +02:00
|
|
|
#endif
|
2003-05-10 01:16:14 +03:00
|
|
|
}
|
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
static inline int dirac_get_se_golomb(GetBitContext *gb)
|
|
|
|
{
|
2016-05-24 01:20:34 +02:00
|
|
|
uint32_t ret = get_interleaved_ue_golomb(gb);
|
2007-08-15 15:59:27 +03:00
|
|
|
|
|
|
|
if (ret) {
|
2015-03-07 17:42:05 +02:00
|
|
|
int sign = -get_bits1(gb);
|
2015-02-13 18:58:58 +02:00
|
|
|
ret = (ret ^ sign) - sign;
|
2007-08-15 15:59:27 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2003-06-14 00:31:28 +03:00
|
|
|
/**
|
2003-07-13 14:06:45 +03:00
|
|
|
* read unsigned golomb rice code (ffv1).
|
2003-06-14 00:31:28 +03:00
|
|
|
*/
|
2013-10-22 14:12:49 +03:00
|
|
|
static inline int get_ur_golomb(GetBitContext *gb, int k, int limit,
|
|
|
|
int esc_len)
|
|
|
|
{
|
2003-06-14 00:31:28 +03:00
|
|
|
unsigned int buf;
|
|
|
|
int log;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2018-08-30 22:36:55 +02:00
|
|
|
#if CACHED_BITSTREAM_READER
|
2017-07-07 16:56:10 +02:00
|
|
|
buf = show_bits_long(gb, 32);
|
|
|
|
|
|
|
|
log = av_log2(buf);
|
|
|
|
|
|
|
|
if (log > 31 - limit) {
|
|
|
|
buf >>= log - k;
|
|
|
|
buf += (30 - log) << k;
|
|
|
|
skip_bits_long(gb, 32 + k - log);
|
|
|
|
|
|
|
|
return buf;
|
|
|
|
} else {
|
|
|
|
skip_bits_long(gb, limit);
|
|
|
|
buf = get_bits_long(gb, esc_len);
|
|
|
|
|
|
|
|
return buf + limit - 1;
|
|
|
|
}
|
|
|
|
#else
|
2003-06-14 00:31:28 +03:00
|
|
|
OPEN_READER(re, gb);
|
|
|
|
UPDATE_CACHE(re, gb);
|
2013-10-22 14:12:49 +03:00
|
|
|
buf = GET_CACHE(re, gb);
|
2003-06-14 00:31:28 +03:00
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
log = av_log2(buf);
|
2003-07-13 14:06:45 +03:00
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
if (log > 31 - limit) {
|
2003-06-14 00:31:28 +03:00
|
|
|
buf >>= log - k;
|
2015-03-11 17:47:13 +02:00
|
|
|
buf += (30U - log) << k;
|
2003-06-14 00:31:28 +03:00
|
|
|
LAST_SKIP_BITS(re, gb, 32 + k - log);
|
|
|
|
CLOSE_READER(re, gb);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2003-06-14 00:31:28 +03:00
|
|
|
return buf;
|
2013-10-22 14:12:49 +03:00
|
|
|
} else {
|
2009-09-11 09:25:36 +03:00
|
|
|
LAST_SKIP_BITS(re, gb, limit);
|
|
|
|
UPDATE_CACHE(re, gb);
|
|
|
|
|
|
|
|
buf = SHOW_UBITS(re, gb, esc_len);
|
|
|
|
|
|
|
|
LAST_SKIP_BITS(re, gb, esc_len);
|
2003-06-14 00:31:28 +03:00
|
|
|
CLOSE_READER(re, gb);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2003-07-13 14:06:45 +03:00
|
|
|
return buf + limit - 1;
|
|
|
|
}
|
2017-07-07 16:56:10 +02:00
|
|
|
#endif
|
2003-07-13 14:06:45 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* read unsigned golomb rice code (jpegls).
|
|
|
|
*/
|
2013-10-22 14:12:49 +03:00
|
|
|
static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit,
|
|
|
|
int esc_len)
|
|
|
|
{
|
2003-07-13 14:06:45 +03:00
|
|
|
unsigned int buf;
|
|
|
|
int log;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2018-08-30 22:36:55 +02:00
|
|
|
#if CACHED_BITSTREAM_READER
|
2017-07-07 16:56:10 +02:00
|
|
|
buf = show_bits_long(gb, 32);
|
|
|
|
|
|
|
|
log = av_log2(buf);
|
|
|
|
|
|
|
|
if (log - k >= 1 && 32 - log < limit) {
|
|
|
|
buf >>= log - k;
|
|
|
|
buf += (30 - log) << k;
|
|
|
|
skip_bits_long(gb, 32 + k - log);
|
|
|
|
|
|
|
|
return buf;
|
|
|
|
} else {
|
|
|
|
int i;
|
|
|
|
for (i = 0;
|
|
|
|
i < limit && get_bits1(gb) == 0 && get_bits_left(gb) > 0;
|
|
|
|
i++);
|
|
|
|
|
|
|
|
if (i < limit - 1) {
|
|
|
|
buf = get_bits_long(gb, k);
|
|
|
|
|
|
|
|
return buf + (i << k);
|
|
|
|
} else if (i == limit - 1) {
|
|
|
|
buf = get_bits_long(gb, esc_len);
|
|
|
|
|
|
|
|
return buf + 1;
|
|
|
|
} else
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
#else
|
2003-07-13 14:06:45 +03:00
|
|
|
OPEN_READER(re, gb);
|
|
|
|
UPDATE_CACHE(re, gb);
|
2013-10-22 14:12:49 +03:00
|
|
|
buf = GET_CACHE(re, gb);
|
2003-07-13 14:06:45 +03:00
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
log = av_log2(buf);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2017-05-06 18:25:02 +02:00
|
|
|
av_assert2(k <= 31);
|
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) &&
|
|
|
|
32 - log < limit) {
|
2003-07-13 14:06:45 +03:00
|
|
|
buf >>= log - k;
|
2015-03-11 17:47:13 +02:00
|
|
|
buf += (30U - log) << k;
|
2003-07-13 14:06:45 +03:00
|
|
|
LAST_SKIP_BITS(re, gb, 32 + k - log);
|
|
|
|
CLOSE_READER(re, gb);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2003-07-13 14:06:45 +03:00
|
|
|
return buf;
|
2013-10-22 14:12:49 +03:00
|
|
|
} else {
|
2003-07-13 14:06:45 +03:00
|
|
|
int i;
|
2018-11-09 22:50:23 +02:00
|
|
|
for (i = 0; i + MIN_CACHE_BITS <= limit && SHOW_UBITS(re, gb, MIN_CACHE_BITS) == 0; i += MIN_CACHE_BITS) {
|
2016-12-08 02:46:26 +02:00
|
|
|
if (gb->size_in_bits <= re_index) {
|
|
|
|
CLOSE_READER(re, gb);
|
2011-11-11 01:03:48 +03:00
|
|
|
return -1;
|
2016-12-08 02:46:26 +02:00
|
|
|
}
|
2018-11-09 22:50:23 +02:00
|
|
|
LAST_SKIP_BITS(re, gb, MIN_CACHE_BITS);
|
2003-07-13 14:06:45 +03:00
|
|
|
UPDATE_CACHE(re, gb);
|
|
|
|
}
|
2018-11-09 22:50:23 +02:00
|
|
|
for (; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) {
|
|
|
|
SKIP_BITS(re, gb, 1);
|
|
|
|
}
|
|
|
|
LAST_SKIP_BITS(re, gb, 1);
|
|
|
|
UPDATE_CACHE(re, gb);
|
2003-07-13 14:06:45 +03:00
|
|
|
|
2013-10-22 14:12:49 +03:00
|
|
|
if (i < limit - 1) {
|
|
|
|
if (k) {
|
2015-05-17 19:07:17 +02:00
|
|
|
if (k > MIN_CACHE_BITS - 1) {
|
|
|
|
buf = SHOW_UBITS(re, gb, 16) << (k-16);
|
|
|
|
LAST_SKIP_BITS(re, gb, 16);
|
|
|
|
UPDATE_CACHE(re, gb);
|
|
|
|
buf |= SHOW_UBITS(re, gb, k-16);
|
|
|
|
LAST_SKIP_BITS(re, gb, k-16);
|
|
|
|
} else {
|
|
|
|
buf = SHOW_UBITS(re, gb, k);
|
|
|
|
LAST_SKIP_BITS(re, gb, k);
|
|
|
|
}
|
2013-10-22 14:12:49 +03:00
|
|
|
} else {
|
|
|
|
buf = 0;
|
2003-07-13 14:06:45 +03:00
|
|
|
}
|
|
|
|
|
2017-05-11 21:42:45 +02:00
|
|
|
buf += ((SUINT)i << k);
|
2013-10-22 14:12:49 +03:00
|
|
|
} else if (i == limit - 1) {
|
2003-07-13 14:06:45 +03:00
|
|
|
buf = SHOW_UBITS(re, gb, esc_len);
|
|
|
|
LAST_SKIP_BITS(re, gb, esc_len);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2016-12-08 02:46:26 +02:00
|
|
|
buf ++;
|
|
|
|
} else {
|
|
|
|
buf = -1;
|
|
|
|
}
|
|
|
|
CLOSE_READER(re, gb);
|
|
|
|
return buf;
|
2003-07-13 14:06:45 +03:00
|
|
|
}
|
2017-07-07 16:56:10 +02:00
|
|
|
#endif
|
2003-06-14 00:31:28 +03:00
|
|
|
}
|
|
|
|
|
2004-02-18 03:49:30 +02:00
|
|
|
/**
|
2004-09-08 20:59:22 +03:00
|
|
|
* read signed golomb rice code (ffv1).
|
|
|
|
*/
|
2013-10-22 14:12:49 +03:00
|
|
|
static inline int get_sr_golomb(GetBitContext *gb, int k, int limit,
|
|
|
|
int esc_len)
|
|
|
|
{
|
2015-05-17 19:08:38 +02:00
|
|
|
unsigned v = get_ur_golomb(gb, k, limit, esc_len);
|
2015-03-07 17:42:05 +02:00
|
|
|
return (v >> 1) ^ -(v & 1);
|
2004-09-08 20:59:22 +03:00
|
|
|
}
|
|
|
|
|
2004-09-10 22:40:55 +03:00
|
|
|
/**
|
2004-09-08 20:59:22 +03:00
|
|
|
* read signed golomb rice code (flac).
|
2004-02-18 03:49:30 +02:00
|
|
|
*/
|
2013-10-22 14:12:49 +03:00
|
|
|
static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit,
|
|
|
|
int esc_len)
|
|
|
|
{
|
2015-05-17 19:08:38 +02:00
|
|
|
unsigned v = get_ur_golomb_jpegls(gb, k, limit, esc_len);
|
2013-10-22 14:12:49 +03:00
|
|
|
return (v >> 1) ^ -(v & 1);
|
2004-02-18 03:49:30 +02:00
|
|
|
}
|
|
|
|
|
2005-02-26 05:36:04 +02:00
|
|
|
/**
|
|
|
|
* read unsigned golomb rice code (shorten).
|
|
|
|
*/
|
2013-10-22 14:12:49 +03:00
|
|
|
static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k)
|
|
|
|
{
|
|
|
|
return get_ur_golomb_jpegls(gb, k, INT_MAX, 0);
|
2005-02-26 05:36:04 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
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* read signed golomb rice code (shorten).
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*/
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2013-10-22 14:12:49 +03:00
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static inline int get_sr_golomb_shorten(GetBitContext *gb, int k)
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2005-02-26 05:36:04 +02:00
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{
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int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0);
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2015-02-13 18:58:58 +02:00
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return (uvar >> 1) ^ -(uvar & 1);
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2005-02-26 05:36:04 +02:00
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}
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2003-04-04 17:42:28 +03:00
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#ifdef TRACE
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2012-09-25 20:04:47 +03:00
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static inline int get_ue(GetBitContext *s, const char *file, const char *func,
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int line)
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{
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2013-10-22 14:12:49 +03:00
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int show = show_bits(s, 24);
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int pos = get_bits_count(s);
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int i = get_ue_golomb(s);
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int len = get_bits_count(s) - pos;
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int bits = show >> (24 - len);
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2005-12-17 20:14:38 +02:00
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2013-10-22 14:12:49 +03:00
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av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n",
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bits, len, i, pos, file, func, line);
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2005-12-17 20:14:38 +02:00
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2003-04-04 17:42:28 +03:00
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return i;
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}
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2012-09-25 20:04:47 +03:00
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static inline int get_se(GetBitContext *s, const char *file, const char *func,
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int line)
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{
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2013-10-22 14:12:49 +03:00
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int show = show_bits(s, 24);
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int pos = get_bits_count(s);
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int i = get_se_golomb(s);
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int len = get_bits_count(s) - pos;
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int bits = show >> (24 - len);
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2005-12-17 20:14:38 +02:00
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2013-10-22 14:12:49 +03:00
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av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n",
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bits, len, i, pos, file, func, line);
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2005-12-17 20:14:38 +02:00
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2003-04-04 17:42:28 +03:00
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return i;
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}
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2013-10-22 14:12:49 +03:00
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static inline int get_te(GetBitContext *s, int r, char *file, const char *func,
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int line)
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{
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int show = show_bits(s, 24);
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int pos = get_bits_count(s);
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int i = get_te0_golomb(s, r);
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int len = get_bits_count(s) - pos;
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int bits = show >> (24 - len);
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2005-12-17 20:14:38 +02:00
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2013-10-22 14:12:49 +03:00
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av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n",
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bits, len, i, pos, file, func, line);
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2005-12-17 20:14:38 +02:00
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2003-04-04 17:42:28 +03:00
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return i;
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}
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2015-12-11 18:37:01 +02:00
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#define get_ue_golomb(a) get_ue(a, __FILE__, __func__, __LINE__)
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#define get_se_golomb(a) get_se(a, __FILE__, __func__, __LINE__)
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#define get_te_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__)
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#define get_te0_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__)
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2003-04-04 17:42:28 +03:00
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2013-10-22 14:12:49 +03:00
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#endif /* TRACE */
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2003-04-04 17:42:28 +03:00
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/**
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2017-06-14 04:08:58 +02:00
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* write unsigned exp golomb code. 2^16 - 2 at most
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2003-04-04 17:42:28 +03:00
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*/
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2013-10-22 14:12:49 +03:00
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static inline void set_ue_golomb(PutBitContext *pb, int i)
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{
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2013-10-23 20:45:07 +03:00
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av_assert2(i >= 0);
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2017-06-13 02:56:58 +02:00
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av_assert2(i <= 0xFFFE);
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2003-04-04 17:42:28 +03:00
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2013-10-22 14:12:49 +03:00
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if (i < 256)
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put_bits(pb, ff_ue_golomb_len[i], i + 1);
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else {
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2013-10-23 16:43:19 +03:00
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int e = av_log2(i + 1);
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2013-10-22 14:12:49 +03:00
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put_bits(pb, 2 * e + 1, i + 1);
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2003-04-04 17:42:28 +03:00
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}
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}
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2017-06-14 04:35:20 +02:00
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/**
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* write unsigned exp golomb code. 2^32-2 at most.
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*/
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static inline void set_ue_golomb_long(PutBitContext *pb, uint32_t i)
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{
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av_assert2(i <= (UINT32_MAX - 1));
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if (i < 256)
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put_bits(pb, ff_ue_golomb_len[i], i + 1);
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else {
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int e = av_log2(i + 1);
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put_bits64(pb, 2 * e + 1, i + 1);
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}
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}
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2003-04-04 17:42:28 +03:00
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/**
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* write truncated unsigned exp golomb code.
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*/
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2013-10-22 14:12:49 +03:00
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static inline void set_te_golomb(PutBitContext *pb, int i, int range)
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{
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2012-06-06 21:13:17 +03:00
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av_assert2(range >= 1);
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2013-10-23 20:45:07 +03:00
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av_assert2(i <= range);
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2003-04-04 17:42:28 +03:00
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2013-10-22 14:12:49 +03:00
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if (range == 2)
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put_bits(pb, 1, i ^ 1);
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else
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set_ue_golomb(pb, i);
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2003-04-04 17:42:28 +03:00
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}
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/**
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2005-10-13 01:43:12 +03:00
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* write signed exp golomb code. 16 bits at most.
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2003-04-04 17:42:28 +03:00
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*/
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2013-10-22 14:12:49 +03:00
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static inline void set_se_golomb(PutBitContext *pb, int i)
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{
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i = 2 * i - 1;
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if (i < 0)
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i ^= -1; //FIXME check if gcc does the right thing
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2003-04-04 17:42:28 +03:00
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set_ue_golomb(pb, i);
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}
|
2003-06-14 00:31:28 +03:00
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/**
|
2003-07-13 14:06:45 +03:00
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* write unsigned golomb rice code (ffv1).
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2003-06-14 00:31:28 +03:00
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*/
|
2013-10-22 14:12:49 +03:00
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static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit,
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int esc_len)
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{
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2003-06-14 00:31:28 +03:00
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int e;
|
2005-12-17 20:14:38 +02:00
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|
2013-10-23 20:45:07 +03:00
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av_assert2(i >= 0);
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2005-12-17 20:14:38 +02:00
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|
2013-10-22 14:12:49 +03:00
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e = i >> k;
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if (e < limit)
|
2015-04-22 03:28:21 +02:00
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put_bits(pb, e + k + 1, (1 << k) + av_mod_uintp2(i, k));
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2013-10-22 14:12:49 +03:00
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else
|
2003-07-13 14:06:45 +03:00
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put_bits(pb, limit + esc_len, i - limit + 1);
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}
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/**
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* write unsigned golomb rice code (jpegls).
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*/
|
2013-10-22 14:12:49 +03:00
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static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k,
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int limit, int esc_len)
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{
|
2003-07-13 14:06:45 +03:00
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int e;
|
2005-12-17 20:14:38 +02:00
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|
2013-10-23 20:45:07 +03:00
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av_assert2(i >= 0);
|
2005-12-17 20:14:38 +02:00
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|
2013-10-22 14:12:49 +03:00
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e = (i >> k) + 1;
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if (e < limit) {
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while (e > 31) {
|
2006-06-24 13:20:15 +03:00
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put_bits(pb, 31, 0);
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e -= 31;
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}
|
2003-07-13 14:06:45 +03:00
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put_bits(pb, e, 1);
|
2013-10-22 14:12:49 +03:00
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if (k)
|
2008-07-13 17:27:48 +03:00
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put_sbits(pb, k, i);
|
2013-10-22 14:12:49 +03:00
|
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} else {
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while (limit > 31) {
|
2006-10-22 07:52:15 +03:00
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put_bits(pb, 31, 0);
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limit -= 31;
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}
|
2013-10-22 14:12:49 +03:00
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put_bits(pb, limit, 1);
|
2003-07-13 14:06:45 +03:00
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put_bits(pb, esc_len, i - 1);
|
2003-06-14 00:31:28 +03:00
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}
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}
|
2004-09-08 20:59:22 +03:00
|
|
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|
|
|
|
/**
|
|
|
|
* write signed golomb rice code (ffv1).
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|
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*/
|
2013-10-22 14:12:49 +03:00
|
|
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static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit,
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int esc_len)
|
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{
|
2004-09-08 20:59:22 +03:00
|
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int v;
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|
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|
2013-10-22 14:12:49 +03:00
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v = -2 * i - 1;
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v ^= (v >> 31);
|
2004-09-08 20:59:22 +03:00
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set_ur_golomb(pb, v, k, limit, esc_len);
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|
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}
|
|
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|
|
|
|
|
/**
|
|
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|
* write signed golomb rice code (flac).
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|
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*/
|
2013-10-22 14:12:49 +03:00
|
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static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k,
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int limit, int esc_len)
|
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{
|
2004-09-08 20:59:22 +03:00
|
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int v;
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|
2013-10-22 14:12:49 +03:00
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v = -2 * i - 1;
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v ^= (v >> 31);
|
2004-09-08 20:59:22 +03:00
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set_ur_golomb_jpegls(pb, v, k, limit, esc_len);
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}
|
2007-06-17 03:01:30 +03:00
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|
2008-08-31 10:39:47 +03:00
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#endif /* AVCODEC_GOLOMB_H */
|