+++ /dev/null
-/*
- * exp golomb vlc stuff
- * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-/**
- * @file golomb.h
- * @brief
- * exp golomb vlc stuff
- * @author Michael Niedermayer <michaelni@gmx.at>
- */
-
-#define INVALID_VLC 0x80000000
-
-extern const uint8_t ff_golomb_vlc_len[512];
-extern const uint8_t ff_ue_golomb_vlc_code[512];
-extern const int8_t ff_se_golomb_vlc_code[512];
-extern const uint8_t ff_ue_golomb_len[256];
-
-extern const uint8_t ff_interleaved_golomb_vlc_len[256];
-extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];
-extern const int8_t ff_interleaved_se_golomb_vlc_code[256];
-
-
- /**
- * read unsigned exp golomb code.
- */
-static inline int get_ue_golomb(GetBitContext *gb){
- unsigned int buf;
- int log;
-
- OPEN_READER(re, gb);
- UPDATE_CACHE(re, gb);
- buf=GET_CACHE(re, gb);
-
- if(buf >= (1<<27)){
- buf >>= 32 - 9;
- LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
- CLOSE_READER(re, gb);
-
- return ff_ue_golomb_vlc_code[buf];
- }else{
- log= 2*av_log2(buf) - 31;
- buf>>= log;
- buf--;
- LAST_SKIP_BITS(re, gb, 32 - log);
- CLOSE_READER(re, gb);
-
- return buf;
- }
-}
-
-static inline int svq3_get_ue_golomb(GetBitContext *gb){
- uint32_t buf;
- int log;
-
- OPEN_READER(re, gb);
- UPDATE_CACHE(re, gb);
- buf=GET_CACHE(re, gb);
-
- if(buf&0xAA800000){
- buf >>= 32 - 8;
- LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
- CLOSE_READER(re, gb);
-
- return ff_interleaved_ue_golomb_vlc_code[buf];
- }else{
- buf|=1;
- if((buf & 0xAAAAAAAA) == 0)
- return INVALID_VLC;
-
- for(log=31; (buf & 0x80000000) == 0; log--){
- buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
- }
-
- LAST_SKIP_BITS(re, gb, 63 - 2*log);
- CLOSE_READER(re, gb);
-
- return ((buf << log) >> log) - 1;
- }
-}
-
-/**
- * read unsigned truncated exp golomb code.
- */
-static inline int get_te0_golomb(GetBitContext *gb, int range){
- assert(range >= 1);
-
- if(range==1) return 0;
- else if(range==2) return get_bits1(gb)^1;
- else return get_ue_golomb(gb);
-}
-
-/**
- * read unsigned truncated exp golomb code.
- */
-static inline int get_te_golomb(GetBitContext *gb, int range){
- assert(range >= 1);
-
- if(range==2) return get_bits1(gb)^1;
- else return get_ue_golomb(gb);
-}
-
-
-/**
- * read signed exp golomb code.
- */
-static inline int get_se_golomb(GetBitContext *gb){
- unsigned int buf;
- int log;
-
- OPEN_READER(re, gb);
- UPDATE_CACHE(re, gb);
- buf=GET_CACHE(re, gb);
-
- if(buf >= (1<<27)){
- buf >>= 32 - 9;
- LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
- CLOSE_READER(re, gb);
-
- return ff_se_golomb_vlc_code[buf];
- }else{
- log= 2*av_log2(buf) - 31;
- buf>>= log;
-
- LAST_SKIP_BITS(re, gb, 32 - log);
- CLOSE_READER(re, gb);
-
- if(buf&1) buf= -(buf>>1);
- else buf= (buf>>1);
-
- return buf;
- }
-}
-
-static inline int svq3_get_se_golomb(GetBitContext *gb){
- unsigned int buf;
- int log;
-
- OPEN_READER(re, gb);
- UPDATE_CACHE(re, gb);
- buf=GET_CACHE(re, gb);
-
- if(buf&0xAA800000){
- buf >>= 32 - 8;
- LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
- CLOSE_READER(re, gb);
-
- return ff_interleaved_se_golomb_vlc_code[buf];
- }else{
- buf |=1;
- if((buf & 0xAAAAAAAA) == 0)
- return INVALID_VLC;
-
- for(log=31; (buf & 0x80000000) == 0; log--){
- buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
- }
-
- LAST_SKIP_BITS(re, gb, 63 - 2*log);
- CLOSE_READER(re, gb);
-
- return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
- }
-}
-
-/**
- * read unsigned golomb rice code (ffv1).
- */
-static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, int esc_len){
- unsigned int buf;
- int log;
-
- OPEN_READER(re, gb);
- UPDATE_CACHE(re, gb);
- buf=GET_CACHE(re, gb);
-
- log= av_log2(buf);
-
- if(log > 31-limit){
- buf >>= log - k;
- buf += (30-log)<<k;
- LAST_SKIP_BITS(re, gb, 32 + k - log);
- CLOSE_READER(re, gb);
-
- return buf;
- }else{
- buf >>= 32 - limit - esc_len;
- LAST_SKIP_BITS(re, gb, esc_len + limit);
- CLOSE_READER(re, gb);
-
- return buf + limit - 1;
- }
-}
-
-/**
- * read unsigned golomb rice code (jpegls).
- */
-static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, int esc_len){
- unsigned int buf;
- int log;
-
- OPEN_READER(re, gb);
- UPDATE_CACHE(re, gb);
- buf=GET_CACHE(re, gb);
-
- log= av_log2(buf);
-
- if(log > 31-11){
- buf >>= log - k;
- buf += (30-log)<<k;
- LAST_SKIP_BITS(re, gb, 32 + k - log);
- CLOSE_READER(re, gb);
-
- return buf;
- }else{
- int i;
- for(i=0; SHOW_UBITS(re, gb, 1) == 0; i++){
- LAST_SKIP_BITS(re, gb, 1);
- UPDATE_CACHE(re, gb);
- }
- SKIP_BITS(re, gb, 1);
-
- if(i < limit - 1){
- if(k){
- buf = SHOW_UBITS(re, gb, k);
- LAST_SKIP_BITS(re, gb, k);
- }else{
- buf=0;
- }
-
- CLOSE_READER(re, gb);
- return buf + (i<<k);
- }else if(i == limit - 1){
- buf = SHOW_UBITS(re, gb, esc_len);
- LAST_SKIP_BITS(re, gb, esc_len);
- CLOSE_READER(re, gb);
-
- return buf + 1;
- }else
- return -1;
- }
-}
-
-#ifdef TRACE
-
-static inline int get_ue(GetBitContext *s, char *file, char *func, int line){
- int show= show_bits(s, 24);
- int pos= get_bits_count(s);
- int i= get_ue_golomb(s);
- int len= get_bits_count(s) - pos;
- int bits= show>>(24-len);
-
- print_bin(bits, len);
-
- printf("%5d %2d %3d ue @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line);
-
- return i;
-}
-
-static inline int get_se(GetBitContext *s, char *file, char *func, int line){
- int show= show_bits(s, 24);
- int pos= get_bits_count(s);
- int i= get_se_golomb(s);
- int len= get_bits_count(s) - pos;
- int bits= show>>(24-len);
-
- print_bin(bits, len);
-
- printf("%5d %2d %3d se @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line);
-
- return i;
-}
-
-static inline int get_te(GetBitContext *s, int r, char *file, char *func, int line){
- int show= show_bits(s, 24);
- int pos= get_bits_count(s);
- int i= get_te0_golomb(s, r);
- int len= get_bits_count(s) - pos;
- int bits= show>>(24-len);
-
- print_bin(bits, len);
-
- printf("%5d %2d %3d te @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line);
-
- return i;
-}
-
-#define get_ue_golomb(a) get_ue(a, __FILE__, __PRETTY_FUNCTION__, __LINE__)
-#define get_se_golomb(a) get_se(a, __FILE__, __PRETTY_FUNCTION__, __LINE__)
-#define get_te_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__)
-#define get_te0_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__)
-
-#endif
-
-/**
- * write unsigned exp golomb code.
- */
-static inline void set_ue_golomb(PutBitContext *pb, int i){
- int e;
-
- assert(i>=0);
-
-#if 0
- if(i=0){
- put_bits(pb, 1, 1);
- return;
- }
-#endif
- if(i<256)
- put_bits(pb, ff_ue_golomb_len[i], i+1);
- else{
- e= av_log2(i+1);
-
- put_bits(pb, 2*e+1, i+1);
- }
-}
-
-/**
- * write truncated unsigned exp golomb code.
- */
-static inline void set_te_golomb(PutBitContext *pb, int i, int range){
- assert(range >= 1);
- assert(i<=range);
-
- if(range==2) put_bits(pb, 1, i^1);
- else set_ue_golomb(pb, i);
-}
-
-/**
- * write signed exp golomb code.
- */
-static inline void set_se_golomb(PutBitContext *pb, int i){
-#if 0
- if(i<=0) i= -2*i;
- else i= 2*i-1;
-#elif 1
- i= 2*i-1;
- if(i<0) i^= -1; //FIXME check if gcc does the right thing
-#else
- i= 2*i-1;
- i^= (i>>31);
-#endif
- set_ue_golomb(pb, i);
-}
-
-/**
- * write unsigned golomb rice code (ffv1).
- */
-static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){
- int e;
-
- assert(i>=0);
-
- e= i>>k;
- if(e<limit){
- put_bits(pb, e + k + 1, (1<<k) + (i&((1<<k)-1)));
- }else{
- put_bits(pb, limit + esc_len, i - limit + 1);
- }
-}
-
-/**
- * write unsigned golomb rice code (jpegls).
- */
-static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, int limit, int esc_len){
- int e;
-
- assert(i>=0);
-
- e= (i>>k) + 1;
- if(e<limit){
- put_bits(pb, e, 1);
- if(k)
- put_bits(pb, k, i&((1<<k)-1));
- }else{
- put_bits(pb, limit , 1);
- put_bits(pb, esc_len, i - 1);
- }
-}
projects / synfig.git / blobdiff