X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fgolomb.h;h=cff7e42e51abff24e868b96a69a5022d8e134d9c;hb=e39a9212ab37a55b346801c77487d8a47b6f9fe2;hp=9bf7aec466bab312330916e20496324e96b07bc9;hpb=76aca7a8bfa4d050e1e88245bbbb324665d43691;p=ffmpeg diff --git a/libavcodec/golomb.h b/libavcodec/golomb.h index 9bf7aec466b..cff7e42e51a 100644 --- a/libavcodec/golomb.h +++ b/libavcodec/golomb.h @@ -3,31 +3,38 @@ * Copyright (c) 2003 Michael Niedermayer * Copyright (c) 2004 Alex Beregszaszi * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * 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 2.1 of the License, or (at your option) any later version. * - * FFmpeg 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 FFmpeg; if not, write to the Free Software + * 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 + * @file * @brief * exp golomb vlc stuff * @author Michael Niedermayer and Alex Beregszaszi */ +#ifndef AVCODEC_GOLOMB_H +#define AVCODEC_GOLOMB_H + +#include + +#include "bitstream.h" +#include "put_bits.h" + #define INVALID_VLC 0x80000000 extern const uint8_t ff_golomb_vlc_len[512]; @@ -38,179 +45,225 @@ 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(BitstreamContext *bc) +{ unsigned int buf; - int log; - OPEN_READER(re, gb); - UPDATE_CACHE(re, gb); - buf=GET_CACHE(re, gb); + buf = bitstream_peek(bc, 32); - if(buf >= (1<<27)){ + if (buf >= (1 << 27)) { buf >>= 32 - 9; - LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); - CLOSE_READER(re, gb); + bitstream_skip(bc, ff_golomb_vlc_len[buf]); 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); + bitstream_skip(bc, 32 - log); 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(BitstreamContext *bc) +{ + unsigned buf, log; + + buf = bitstream_peek(bc, 32); + log = 31 - av_log2(buf); + bitstream_skip(bc, log); + + return bitstream_read(bc, 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(BitstreamContext *bc) +{ + unsigned int buf; + + buf = bitstream_peek(bc, 32); + + buf >>= 32 - 9; + bitstream_skip(bc, ff_golomb_vlc_len[buf]); + + return ff_ue_golomb_vlc_code[buf]; +} + +static inline unsigned get_interleaved_ue_golomb(BitstreamContext *bc) +{ uint32_t buf; - int log; - OPEN_READER(re, gb); - UPDATE_CACHE(re, gb); - buf=GET_CACHE(re, gb); + buf = bitstream_peek(bc, 32); - if(buf&0xAA800000){ + if (buf & 0xAA800000) { buf >>= 32 - 8; - LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); - CLOSE_READER(re, gb); + bitstream_skip(bc, ff_interleaved_golomb_vlc_len[buf]); return ff_interleaved_ue_golomb_vlc_code[buf]; - }else{ - LAST_SKIP_BITS(re, gb, 8); - UPDATE_CACHE(re, gb); - buf |= 1 | (GET_CACHE(re, gb) >> 8); + } else { + unsigned ret = 1; - if((buf & 0xAAAAAAAA) == 0) - return INVALID_VLC; + do { + buf >>= 32 - 8; + bitstream_skip(bc, FFMIN(ff_interleaved_golomb_vlc_len[buf], 8)); - 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); + 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]; + buf = bitstream_peek(bc, 32); + } while (bitstream_bits_left(bc) > 0); - 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(BitstreamContext *bc, 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 bitstream_read_bit(bc) ^ 1; + else + return get_ue_golomb(bc); } /** * read unsigned truncated exp golomb code. */ -static inline int get_te_golomb(GetBitContext *gb, int range){ +static inline int get_te_golomb(BitstreamContext *bc, int range) +{ assert(range >= 1); - if(range==2) return get_bits1(gb)^1; - else return get_ue_golomb(gb); + if (range == 2) + return bitstream_read_bit(bc) ^ 1; + else + return get_ue_golomb(bc); } - /** * read signed exp golomb code. */ -static inline int get_se_golomb(GetBitContext *gb){ +static inline int get_se_golomb(BitstreamContext *bc) +{ unsigned int buf; - int log; - OPEN_READER(re, gb); - UPDATE_CACHE(re, gb); - buf=GET_CACHE(re, gb); + buf = bitstream_peek(bc, 32); - if(buf >= (1<<27)){ + if (buf >= (1 << 27)) { buf >>= 32 - 9; - LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); - CLOSE_READER(re, gb); + bitstream_skip(bc, ff_golomb_vlc_len[buf]); 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); + bitstream_skip(bc, 32 - log); - 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(BitstreamContext *bc) +{ + unsigned int buf = get_ue_golomb_long(bc); + + if (buf & 1) + buf = (buf + 1) >> 1; + else + buf = -(buf >> 1); + + return buf; +} + +static inline int get_interleaved_se_golomb(BitstreamContext *bc) +{ unsigned int buf; - int log; - OPEN_READER(re, gb); - UPDATE_CACHE(re, gb); - buf=GET_CACHE(re, gb); + buf = bitstream_peek(bc, 32); - if(buf&0xAA800000){ + if (buf & 0xAA800000) { buf >>= 32 - 8; - LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); - CLOSE_READER(re, gb); + bitstream_skip(bc, ff_interleaved_golomb_vlc_len[buf]); 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); + } else { + int log; + bitstream_skip(bc, 8); + buf |= 1 | bitstream_peek(bc, 24); - if((buf & 0xAAAAAAAA) == 0) + 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 - 8); - CLOSE_READER(re, gb); + bitstream_skip(bc, 63 - 2 * log - 8); return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; } } +static inline int dirac_get_se_golomb(BitstreamContext *bc) +{ + uint32_t ret = get_interleaved_ue_golomb(bc); + + if (ret) { + uint32_t buf; + buf = bitstream_read_signed(bc, 1); + ret = (ret ^ buf) - buf; + } + + return ret; +} + /** * 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(BitstreamContext *bc, 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 = bitstream_peek(bc, 32); - log= av_log2(buf); + log = av_log2(buf); - if(log > 31-limit){ + if (log > 31 - limit) { buf >>= log - k; - buf += (30-log)<>= 32 - limit - esc_len; - LAST_SKIP_BITS(re, gb, esc_len + limit); - CLOSE_READER(re, gb); + } else { + bitstream_skip(bc, limit); + buf = bitstream_read(bc, esc_len); return buf + limit - 1; } @@ -219,48 +272,37 @@ static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, int esc_len /** * read unsigned golomb rice code (jpegls). */ -static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, int esc_len){ +static inline int get_ur_golomb_jpegls(BitstreamContext *bc, 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 = bitstream_peek(bc, 32); - log= av_log2(buf); + log = av_log2(buf); - if(log > 31-11){ + if (log - k >= 1 && 32 - log < limit) { buf >>= log - k; - buf += (30-log)< 0; + i++); - CLOSE_READER(re, gb); - return buf + (i<>1; - else return -(v>>1); + if (v & 1) + return v >> 1; + else + return -(v >> 1); // return (v>>1) ^ -(v&1); } @@ -281,175 +327,169 @@ static inline int get_sr_golomb(GetBitContext *gb, int k, int limit, int esc_len /** * 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); +static inline int get_sr_golomb_flac(BitstreamContext *bc, int k, int limit, + int esc_len) +{ + int v = get_ur_golomb_jpegls(bc, 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); +static inline unsigned int get_ur_golomb_shorten(BitstreamContext *bc, int k) +{ + return get_ur_golomb_jpegls(bc, k, INT_MAX, 0); } /** * read signed golomb rice code (shorten). */ -static inline int get_sr_golomb_shorten(GetBitContext* gb, int k) +static inline int get_sr_golomb_shorten(BitstreamContext *bc, int k) { - int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0); + int uvar = get_ur_golomb_jpegls(bc, 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); +static inline int get_ue(BitstreamContext *s, const char *file, const char *func, + int line) +{ + int show = bitstream_peek(s, 24); + int pos = bitstream_tell(s); + int i = get_ue_golomb(s); + int len = bitstream_tell(s) - pos; + int bits = show >> (24 - len); - av_log(NULL, AV_LOG_DEBUG, "%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, 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); +static inline int get_se(BitstreamContext *s, const char *file, const char *func, + int line) +{ + int show = bitstream_peek(s, 24); + int pos = bitstream_tell(s); + int i = get_se_golomb(s); + int len = bitstream_tell(s) - pos; + int bits = show >> (24 - len); - av_log(NULL, AV_LOG_DEBUG, "%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, 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); +static inline int get_te(BitstreamContext *s, int r, char *file, const char *func, + int line) +{ + int show = bitstream_peek(s, 24); + int pos = bitstream_tell(s); + int i = get_te0_golomb(s, r); + int len = bitstream_tell(s) - pos; + int bits = show >> (24 - len); - av_log(NULL, AV_LOG_DEBUG, "%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_te0_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__) +#define get_ue_golomb(a) get_ue(a, __FILE__, __func__, __LINE__) +#define get_se_golomb(a) get_se(a, __FILE__, __func__, __LINE__) +#define get_te_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__) +#define get_te0_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__) -#endif +#endif /* TRACE */ /** * 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); +static inline void set_ue_golomb(PutBitContext *pb, int i) +{ + assert(i >= 0); - 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. 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 +static inline void set_se_golomb(PutBitContext *pb, int i) +{ + i = 2 * i - 1; + if (i < 0) + i ^= -1; //FIXME check if gcc does the right thing 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){ +static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, + int esc_len) +{ int e; - assert(i>=0); + assert(i >= 0); - e= i>>k; - if(e> 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){ +static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, + int limit, int esc_len) +{ int e; - assert(i>=0); + assert(i >= 0); - e= (i>>k) + 1; - if(e 31) { + 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_bits(pb, k, i&((1< 31) { + 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, limit, 1); put_bits(pb, esc_len, i - 1); } } @@ -457,11 +497,13 @@ static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, int lim /** * write signed golomb rice code (ffv1). */ -static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, int esc_len){ +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); + v = -2 * i - 1; + v ^= (v >> 31); set_ur_golomb(pb, v, k, limit, esc_len); } @@ -469,11 +511,15 @@ static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, int /** * write signed golomb rice code (flac). */ -static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k, int limit, int esc_len){ +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); + v = -2 * i - 1; + v ^= (v >> 31); set_ur_golomb_jpegls(pb, v, k, limit, esc_len); } + +#endif /* AVCODEC_GOLOMB_H */