X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fgolomb.h;h=22a87c64e1afb4d0d51c11adf588ef62419ce0e7;hb=f290e48d86e10f34b5ddc519127636bcebec7c43;hp=9861b18d1a17e7efa521806c201a52a533685ec2;hpb=11e659c203d534c3f6033003be5c2727e2291796;p=ffmpeg diff --git a/libavcodec/golomb.h b/libavcodec/golomb.h index 9861b18d1a1..22a87c64e1a 100644 --- a/libavcodec/golomb.h +++ b/libavcodec/golomb.h @@ -1,30 +1,40 @@ /* * exp golomb vlc stuff * Copyright (c) 2003 Michael Niedermayer + * Copyright (c) 2004 Alex Beregszaszi * - * This library is free software; you can redistribute it and/or + * This file is part of Libav. + * + * Libav 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. + * version 2.1 of the License, or (at your option) any later version. * - * This library is distributed in the hope that it will be useful, + * Libav 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 - * + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ - + /** - * @file golomb.h - * @brief + * @file + * @brief * exp golomb vlc stuff - * @author Michael Niedermayer + * @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]; @@ -35,297 +45,551 @@ 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){ +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 = 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; + } else { + int 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){ +/** + * 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 unsigned 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 = 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); - } + return ff_interleaved_ue_golomb_vlc_code[buf]; + } else { + unsigned ret = 1; + + do { + 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); + } while (BITS_AVAILABLE(re, gb)); - LAST_SKIP_BITS(re, gb, 63 - 2*log); CLOSE_READER(re, gb); - - return ((buf << log) >> log) - 1; + return ret - 1; } } /** * read unsigned truncated exp golomb code. */ -static inline int get_te0_golomb(GetBitContext *gb, int range){ +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); + + 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){ +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); -} + 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){ +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 = 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; - + } else { + int 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); + + if (buf & 1) + buf = -(buf >> 1); + else + buf = (buf >> 1); return buf; } } -static inline int svq3_get_se_golomb(GetBitContext *gb){ +static inline int get_se_golomb_long(GetBitContext *gb) +{ + unsigned int buf = get_ue_golomb_long(gb); + + if (buf & 1) + buf = (buf + 1) >> 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); + buf = GET_CACHE(re, gb); - if(buf&0xAA800000){ + 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) + } else { + int log; + 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--){ + for (log = 31; (buf & 0x80000000) == 0; log--) buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); - } - LAST_SKIP_BITS(re, gb, 63 - 2*log); + 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 ret = svq3_get_ue_golomb(gb); + + if (ret) { + uint32_t buf; + 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. + * read unsigned golomb rice code (ffv1). */ -static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, int esc_len){ +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); + buf = GET_CACHE(re, gb); + + log = av_log2(buf); - log= av_log2(buf); -//printf("buf:%X log:%d\n", buf, log); - if(log > 31-limit){ + if (log > 31 - limit) { buf >>= log - k; - buf += (30-log)<>= log - esc_len; - buf -= 1<= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) && + 32 - log < limit) { + 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; i < limit && SHOW_UBITS(re, gb, 1) == 0 && BITS_AVAILABLE(re, gb); 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; + } +} + +/** + * read signed golomb rice code (ffv1). + */ +static inline int get_sr_golomb(GetBitContext *gb, int k, int limit, + int esc_len) +{ + int v = get_ur_golomb(gb, k, limit, esc_len); + + v++; + if (v & 1) + return v >> 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, 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); - +static inline int get_ue(GetBitContext *s, const 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); - - printf("%5d %2d %3d ue @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line); - + + 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, 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); - +static inline int get_se(GetBitContext *s, const 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); - - printf("%5d %2d %3d se @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line); - + + 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, 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); - +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); - - printf("%5d %2d %3d te @%5d in %s %s:%d\n", bits, len, i, pos, file, func, line); - + + 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_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 +#endif /* TRACE */ /** * write unsigned exp golomb code. */ -static inline void set_ue_golomb(PutBitContext *pb, int i){ - int e; - - assert(i>=0); +static inline void set_ue_golomb(PutBitContext *pb, int i) +{ + assert(i >= 0); #if 0 - if(i=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); + if (i < 256) + put_bits(pb, ff_ue_golomb_len[i], i + 1); + else { + int 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){ +static inline void set_te_golomb(PutBitContext *pb, int i, int range) +{ assert(range >= 1); - assert(i<=range); + assert(i <= range); - if(range==2) put_bits(pb, 1, i^1); - else set_ue_golomb(pb, i); + if (range == 2) + put_bits(pb, 1, i ^ 1); + else + set_ue_golomb(pb, i); } /** - * write signed exp golomb code. + * write signed exp golomb code. 16 bits at most. */ -static inline void set_se_golomb(PutBitContext *pb, int i){ -#if 0 - if(i<=0) i= -2*i; - else i= 2*i-1; +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 + 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); + i = 2 * i - 1; + i ^= (i >> 31); #endif set_ue_golomb(pb, i); } /** - * write unsigned golomb rice code. + * write unsigned golomb rice code (ffv1). */ -static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){ +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; + 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) { + while (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 */