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https://github.com/FFmpeg/FFmpeg.git
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ac2570a8b0
fix data types of residual&decoded fix twos complement bitfields fix utf8 (no, utf8 is not the same as the simple and compact uvlc used in nut) add truncated bitstream support, both ogg and flac demuxers in mplayer cvs provide incomplete frames, and furthermore it isnt possible to find frameboundaries in flac without decoding it completly add escape-less golomb rice decoder (=flac style golomb rice) (ultra efficient, the longest vlc code is just 2^32-1 bits) printf->av_log fix bps for non independant channels fix a few +-1 bugs fix sample order for independant channels fix data_size Originally committed as revision 2791 to svn://svn.ffmpeg.org/ffmpeg/trunk
403 lines
9.6 KiB
C
403 lines
9.6 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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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/**
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* @file golomb.h
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* @brief
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* exp golomb vlc stuff
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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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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/**
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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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static inline int svq3_get_ue_golomb(GetBitContext *gb){
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uint32_t 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_ue_golomb_vlc_code[buf];
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}else{
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buf|=1;
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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);
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CLOSE_READER(re, gb);
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return ((buf << log) >> log) - 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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buf |=1;
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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);
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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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/**
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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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buf >>= 32 - limit - esc_len;
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LAST_SKIP_BITS(re, gb, esc_len + limit);
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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 > 31-11){
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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; 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 unsigned 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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#ifdef TRACE
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static inline int get_ue(GetBitContext *s, char *file, 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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printf("%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, 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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printf("%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, 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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printf("%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.
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*/
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static inline void set_se_golomb(PutBitContext *pb, int 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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put_bits(pb, e, 1);
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if(k)
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put_bits(pb, k, i&((1<<k)-1));
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}else{
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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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