545 lines
13 KiB
C
545 lines
13 KiB
C
/*
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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 file is part of Libav.
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*
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* Libav 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 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 Libav; 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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* @file
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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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#ifndef AVCODEC_GOLOMB_H
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#define AVCODEC_GOLOMB_H
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#include <stdint.h>
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#include "get_bits.h"
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#include "put_bits.h"
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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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extern const uint8_t ff_interleaved_dirac_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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/**
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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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/**
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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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*/
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static inline int get_ue_golomb_31(GetBitContext *gb){
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unsigned int buf;
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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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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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}
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static inline int svq3_get_ue_golomb(GetBitContext *gb){
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uint32_t buf;
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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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int ret = 1;
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do {
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buf >>= 32 - 8;
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LAST_SKIP_BITS(re, 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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UPDATE_CACHE(re, gb);
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buf = GET_CACHE(re, gb);
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} while (HAVE_BITS_REMAINING(re, gb));
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CLOSE_READER(re, gb);
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return ret - 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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static inline int dirac_get_se_golomb(GetBitContext *gb){
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uint32_t buf;
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uint32_t ret;
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ret = svq3_get_ue_golomb(gb);
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if (ret) {
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OPEN_READER(re, gb);
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UPDATE_CACHE(re, gb);
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buf = SHOW_SBITS(re, gb, 1);
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LAST_SKIP_BITS(re, gb, 1);
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ret = (ret ^ buf) - buf;
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CLOSE_READER(re, gb);
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}
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return ret;
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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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LAST_SKIP_BITS(re, gb, limit);
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UPDATE_CACHE(re, gb);
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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 + 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 - k >= 32-MIN_CACHE_BITS+(MIN_CACHE_BITS==32) && 32-log < 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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int i;
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for (i = 0; i < limit && 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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while(e > 31) {
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put_bits(pb, 31, 0);
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e -= 31;
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}
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put_bits(pb, e, 1);
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if(k)
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put_sbits(pb, k, i);
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}else{
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while(limit > 31) {
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put_bits(pb, 31, 0);
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limit -= 31;
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}
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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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}
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#endif /* AVCODEC_GOLOMB_H */
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