ffmpeg / libavcodec / golomb.h @ 5509bffa
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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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* Copyright (c) 2004 Alex Beregszaszi
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*
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* This library is free software; you can redistribute it and/or
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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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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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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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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/**
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* @file golomb.h
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* @brief
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* exp golomb vlc stuff
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* @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
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*/
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#define INVALID_VLC 0x80000000 |
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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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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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/**
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* read unsigned exp golomb code.
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*/
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static inline int get_ue_golomb(GetBitContext *gb){ |
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unsigned int buf; |
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int log;
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OPEN_READER(re, gb); |
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UPDATE_CACHE(re, gb); |
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buf=GET_CACHE(re, gb); |
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if(buf >= (1<<27)){ |
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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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return ff_ue_golomb_vlc_code[buf];
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}else{
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log= 2*av_log2(buf) - 31; |
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buf>>= log; |
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buf--; |
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LAST_SKIP_BITS(re, gb, 32 - log);
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CLOSE_READER(re, gb); |
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return buf;
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} |
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} |
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static inline int svq3_get_ue_golomb(GetBitContext *gb){ |
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uint32_t buf; |
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int log;
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OPEN_READER(re, gb); |
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UPDATE_CACHE(re, gb); |
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buf=GET_CACHE(re, gb); |
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if(buf&0xAA800000){ |
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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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return ff_interleaved_ue_golomb_vlc_code[buf];
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}else{
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LAST_SKIP_BITS(re, gb, 8);
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UPDATE_CACHE(re, gb); |
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buf |= 1 | (GET_CACHE(re, gb) >> 8); |
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if((buf & 0xAAAAAAAA) == 0) |
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return INVALID_VLC;
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for(log=31; (buf & 0x80000000) == 0; log--){ |
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buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); |
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} |
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LAST_SKIP_BITS(re, gb, 63 - 2*log - 8); |
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CLOSE_READER(re, gb); |
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return ((buf << log) >> log) - 1; |
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} |
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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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static inline int get_te0_golomb(GetBitContext *gb, int range){ |
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assert(range >= 1);
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if(range==1) return 0; |
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else if(range==2) return get_bits1(gb)^1; |
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else return get_ue_golomb(gb); |
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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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static inline int get_te_golomb(GetBitContext *gb, int range){ |
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assert(range >= 1);
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if(range==2) return get_bits1(gb)^1; |
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else return get_ue_golomb(gb); |
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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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static inline int get_se_golomb(GetBitContext *gb){ |
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unsigned int buf; |
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int log;
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OPEN_READER(re, gb); |
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UPDATE_CACHE(re, gb); |
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buf=GET_CACHE(re, gb); |
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if(buf >= (1<<27)){ |
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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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return ff_se_golomb_vlc_code[buf];
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}else{
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log= 2*av_log2(buf) - 31; |
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buf>>= log; |
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LAST_SKIP_BITS(re, gb, 32 - log);
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CLOSE_READER(re, gb); |
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if(buf&1) buf= -(buf>>1); |
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else buf= (buf>>1); |
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return buf;
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} |
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} |
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static inline int svq3_get_se_golomb(GetBitContext *gb){ |
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unsigned int buf; |
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int log;
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OPEN_READER(re, gb); |
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UPDATE_CACHE(re, gb); |
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buf=GET_CACHE(re, gb); |
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if(buf&0xAA800000){ |
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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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return ff_interleaved_se_golomb_vlc_code[buf];
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}else{
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LAST_SKIP_BITS(re, gb, 8);
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UPDATE_CACHE(re, gb); |
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buf |= 1 | (GET_CACHE(re, gb) >> 8); |
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if((buf & 0xAAAAAAAA) == 0) |
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return INVALID_VLC;
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for(log=31; (buf & 0x80000000) == 0; log--){ |
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buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); |
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} |
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LAST_SKIP_BITS(re, gb, 63 - 2*log - 8); |
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CLOSE_READER(re, gb); |
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return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; |
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} |
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} |
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/**
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* read unsigned golomb rice code (ffv1).
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*/
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static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, int esc_len){ |
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unsigned int buf; |
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int log;
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OPEN_READER(re, gb); |
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UPDATE_CACHE(re, gb); |
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buf=GET_CACHE(re, gb); |
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log= av_log2(buf); |
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if(log > 31-limit){ |
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buf >>= log - k; |
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buf += (30-log)<<k;
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LAST_SKIP_BITS(re, gb, 32 + k - log);
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CLOSE_READER(re, gb); |
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return buf;
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}else{
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buf >>= 32 - limit - esc_len;
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LAST_SKIP_BITS(re, gb, esc_len + limit); |
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CLOSE_READER(re, gb); |
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return buf + limit - 1; |
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} |
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} |
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/**
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* read unsigned golomb rice code (jpegls).
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*/
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static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, int esc_len){ |
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unsigned int buf; |
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int log;
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OPEN_READER(re, gb); |
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UPDATE_CACHE(re, gb); |
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buf=GET_CACHE(re, gb); |
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log= av_log2(buf); |
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if(log > 31-11){ |
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buf >>= log - k; |
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buf += (30-log)<<k;
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LAST_SKIP_BITS(re, gb, 32 + k - log);
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CLOSE_READER(re, gb); |
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return buf;
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}else{
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int i;
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for(i=0; SHOW_UBITS(re, gb, 1) == 0; i++){ |
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LAST_SKIP_BITS(re, gb, 1);
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UPDATE_CACHE(re, gb); |
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} |
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SKIP_BITS(re, gb, 1);
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if(i < limit - 1){ |
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if(k){
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buf = SHOW_UBITS(re, gb, k); |
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LAST_SKIP_BITS(re, gb, k); |
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}else{
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buf=0;
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} |
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CLOSE_READER(re, gb); |
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return buf + (i<<k);
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}else if(i == limit - 1){ |
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buf = SHOW_UBITS(re, gb, esc_len); |
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LAST_SKIP_BITS(re, gb, esc_len); |
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CLOSE_READER(re, gb); |
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return buf + 1; |
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}else
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return -1; |
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} |
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} |
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/**
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* read signed golomb rice code (ffv1).
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*/
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static inline int get_sr_golomb(GetBitContext *gb, int k, int limit, int esc_len){ |
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int v= get_ur_golomb(gb, k, limit, esc_len);
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v++; |
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if (v&1) return v>>1; |
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else return -(v>>1); |
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// return (v>>1) ^ -(v&1);
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} |
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/**
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* read signed golomb rice code (flac).
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*/
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static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit, int esc_len){ |
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int v= get_ur_golomb_jpegls(gb, k, limit, esc_len);
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return (v>>1) ^ -(v&1); |
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} |
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/**
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* read unsigned golomb rice code (shorten).
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*/
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static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k){ |
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return get_ur_golomb_jpegls(gb, k, INT_MAX, 0); |
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} |
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/**
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* read signed golomb rice code (shorten).
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*/
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static inline int get_sr_golomb_shorten(GetBitContext* gb, int k) |
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{ |
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int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0); |
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if (uvar & 1) |
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return ~(uvar >> 1); |
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else
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return uvar >> 1; |
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} |
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#ifdef TRACE
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static inline int get_ue(GetBitContext *s, char *file, const char *func, int line){ |
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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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print_bin(bits, len); |
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av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line); |
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return i;
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} |
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static inline int get_se(GetBitContext *s, char *file, const char *func, int line){ |
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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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print_bin(bits, len); |
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av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line); |
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return i;
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} |
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static inline int get_te(GetBitContext *s, int r, char *file, const char *func, int line){ |
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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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print_bin(bits, len); |
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av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line); |
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return i;
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} |
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#define get_ue_golomb(a) get_ue(a, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#define get_se_golomb(a) get_se(a, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#define get_te_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#define get_te0_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#endif
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/**
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* write unsigned exp golomb code.
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*/
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static inline void set_ue_golomb(PutBitContext *pb, int i){ |
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int e;
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assert(i>=0);
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#if 0
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if(i=0){
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put_bits(pb, 1, 1);
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return;
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}
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#endif
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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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e= av_log2(i+1);
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put_bits(pb, 2*e+1, i+1); |
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} |
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} |
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/**
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* write truncated unsigned exp golomb code.
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*/
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static inline void set_te_golomb(PutBitContext *pb, int i, int range){ |
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assert(range >= 1);
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assert(i<=range); |
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if(range==2) put_bits(pb, 1, i^1); |
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else set_ue_golomb(pb, i);
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} |
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/**
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* write signed exp golomb code. 16 bits at most.
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*/
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static inline void set_se_golomb(PutBitContext *pb, int i){ |
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// if (i>32767 || i<-32767)
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// av_log(NULL,AV_LOG_ERROR,"value out of range %d\n", i);
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#if 0
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if(i<=0) i= -2*i;
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else i= 2*i-1;
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#elif 1
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i= 2*i-1; |
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if(i<0) i^= -1; //FIXME check if gcc does the right thing |
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#else
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i= 2*i-1; |
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i^= (i>>31);
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#endif
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set_ue_golomb(pb, i); |
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} |
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/**
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* write unsigned golomb rice code (ffv1).
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*/
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static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){ |
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int e;
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assert(i>=0);
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e= i>>k; |
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if(e<limit){
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put_bits(pb, e + k + 1, (1<<k) + (i&((1<<k)-1))); |
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}else{
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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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/**
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* write unsigned golomb rice code (jpegls).
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*/
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static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, int limit, int esc_len){ |
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int e;
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assert(i>=0);
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e= (i>>k) + 1;
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if(e<limit){
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put_bits(pb, e, 1);
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if(k)
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put_bits(pb, k, i&((1<<k)-1)); |
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}else{
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put_bits(pb, limit , 1);
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put_bits(pb, esc_len, i - 1);
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} |
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} |
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/**
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* write signed golomb rice code (ffv1).
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*/
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static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){ |
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int v;
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v = -2*i-1; |
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v ^= (v>>31);
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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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* write signed golomb rice code (flac).
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*/
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static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k, int limit, int esc_len){ |
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int v;
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v = -2*i-1; |
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v ^= (v>>31);
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set_ur_golomb_jpegls(pb, v, k, limit, esc_len); |
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} |