/* * exp golomb vlc stuff * Copyright (c) 2003 Michael Niedermayer * Copyright (c) 2004 Alex Beregszaszi * * This file is part of FFmpeg. * * FFmpeg 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 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * @brief * exp golomb vlc stuff * @author Michael Niedermayer and Alex Beregszaszi */ #ifndef AVCODEC_GOLOMB_H #define AVCODEC_GOLOMB_H #include #include "get_bits.h" #include "put_bits.h" #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]; extern const uint8_t ff_interleaved_dirac_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; } } /** * Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1. */ static inline unsigned get_ue_golomb_long(GetBitContext *gb) { unsigned buf, log; buf = show_bits_long(gb, 32); log = 31 - av_log2(buf); skip_bits_long(gb, log); return get_bits_long(gb, log + 1) - 1; } /** * read unsigned exp golomb code, constraint to a max of 31. * the return value is undefined if the stored value exceeds 31. */ static inline int get_ue_golomb_31(GetBitContext *gb){ unsigned int buf; OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf=GET_CACHE(re, gb); buf >>= 32 - 9; LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); CLOSE_READER(re, gb); return ff_ue_golomb_vlc_code[buf]; } static inline int svq3_get_ue_golomb(GetBitContext *gb){ uint32_t buf; 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{ int ret = 1; while (1) { buf >>= 32 - 8; LAST_SKIP_BITS(re, gb, FFMIN(ff_interleaved_golomb_vlc_len[buf], 8)); if (ff_interleaved_golomb_vlc_len[buf] != 9){ ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1; ret |= ff_interleaved_dirac_golomb_vlc_code[buf]; break; } ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf]; UPDATE_CACHE(re, gb); buf = GET_CACHE(re, gb); } CLOSE_READER(re, gb); return ret - 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{ LAST_SKIP_BITS(re, gb, 8); UPDATE_CACHE(re, gb); buf |= 1 | (GET_CACHE(re, gb) >> 8); 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 - 8); CLOSE_READER(re, gb); return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; } } static inline int dirac_get_se_golomb(GetBitContext *gb){ uint32_t buf; uint32_t ret; ret = svq3_get_ue_golomb(gb); if (ret) { OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf = SHOW_SBITS(re, gb, 1); LAST_SKIP_BITS(re, gb, 1); ret = (ret ^ buf) - buf; CLOSE_READER(re, gb); } return ret; } /** * 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)<= 32-MIN_CACHE_BITS+(MIN_CACHE_BITS==32) && 32-log < limit){ buf >>= log - k; buf += (30-log)<size_in_bits <= re_index) return -1; 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<>1; else return -(v>>1); // return (v>>1) ^ -(v&1); } /** * read signed golomb rice code (flac). */ static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit, int esc_len){ int v= get_ur_golomb_jpegls(gb, k, limit, esc_len); return (v>>1) ^ -(v&1); } /** * read unsigned golomb rice code (shorten). */ static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k){ return get_ur_golomb_jpegls(gb, k, INT_MAX, 0); } /** * read signed golomb rice code (shorten). */ static inline int get_sr_golomb_shorten(GetBitContext* gb, int k) { int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0); if (uvar & 1) return ~(uvar >> 1); else return uvar >> 1; } #ifdef TRACE static inline int get_ue(GetBitContext *s, char *file, const 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); av_log(NULL, AV_LOG_DEBUG, "%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, const 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); av_log(NULL, AV_LOG_DEBUG, "%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, const 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); av_log(NULL, AV_LOG_DEBUG, "%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. 16 bits at most. */ static inline void set_se_golomb(PutBitContext *pb, int i){ // if (i>32767 || i<-32767) // av_log(NULL,AV_LOG_ERROR,"value out of range %d\n", 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=0); e= (i>>k) + 1; if(e 31) { put_bits(pb, 31, 0); e -= 31; } put_bits(pb, e, 1); if(k) put_sbits(pb, k, i); }else{ while(limit > 31) { put_bits(pb, 31, 0); limit -= 31; } put_bits(pb, limit , 1); put_bits(pb, esc_len, i - 1); } } /** * write signed golomb rice code (ffv1). */ static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){ int v; v = -2*i-1; v ^= (v>>31); set_ur_golomb(pb, v, k, limit, esc_len); } /** * write signed golomb rice code (flac). */ static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k, int limit, int esc_len){ int v; v = -2*i-1; v ^= (v>>31); set_ur_golomb_jpegls(pb, v, k, limit, esc_len); } #endif /* AVCODEC_GOLOMB_H */