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new signed golomb routines

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Originally committed as revision 3444 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Beregszaszi 2004-09-08 17:59:22 +00:00
parent b2a1c77162
commit 4579adb00c
2 changed files with 68 additions and 13 deletions
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10
libavcodec/ffv1.c
View File

@ -324,10 +324,8 @@ static inline void put_vlc_symbol(PutBitContext *pb, VlcState * const state, int
code= v ^ ((2*state->drift + state->count)>>31);
#endif
code = -2*code-1;
code^= (code>>31);
//printf("v:%d/%d bias:%d error:%d drift:%d count:%d k:%d\n", v, code, state->bias, state->error_sum, state->drift, state->count, k);
set_ur_golomb(pb, code, k, 12, bits);
set_sr_golomb_ffv1(pb, code, k, 12, bits);
update_vlc_state(state, v);
}
@ -344,13 +342,9 @@ static inline int get_vlc_symbol(GetBitContext *gb, VlcState * const state, int
assert(k<=8);
v= get_ur_golomb(gb, k, 12, bits);
v= get_sr_golomb_ffv1(gb, k, 12, bits);
//printf("v:%d bias:%d error:%d drift:%d count:%d k:%d", v, state->bias, state->error_sum, state->drift, state->count, k);
v++;
if(v&1) v= (v>>1);
else v= -(v>>1);
#if 0 // JPEG LS
if(k==0 && 2*state->drift <= - state->count) v ^= (-1);
#else

71
libavcodec/golomb.h
View File

@ -1,6 +1,7 @@
/*
* exp golomb vlc stuff
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2004 Alex Beregszaszi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -22,7 +23,7 @@
* @file golomb.h
* @brief
* exp golomb vlc stuff
* @author Michael Niedermayer <michaelni@gmx.at>
* @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
*/
#define INVALID_VLC 0x80000000
@ -260,13 +261,37 @@ static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, int
}
/**
* read unsigned golomb rice code (flac).
* read signed golomb rice code (ffv1).
*/
static inline int get_sr_golomb_ffv1(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 signed golomb rice code (sonic).
*/
static inline int get_sr_golomb_sonic(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;
}
#ifdef TRACE
static inline int get_ue(GetBitContext *s, char *file, char *func, int line){
@ -278,7 +303,7 @@ static inline int get_ue(GetBitContext *s, char *file, char *func, int line){
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;
}
@ -292,7 +317,7 @@ static inline int get_se(GetBitContext *s, char *file, char *func, int line){
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;
}
@ -306,7 +331,7 @@ static inline int get_te(GetBitContext *s, int r, char *file, char *func, int li
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;
}
@ -403,3 +428,39 @@ static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, int lim
put_bits(pb, esc_len, i - 1);
}
}
/**
* write signed golomb rice code (ffv1).
*/
static inline void set_sr_golomb_ffv1(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);
}
/**
* write signed golomb rice code (sonic).
*/
static inline void set_sr_golomb_sonic(PutBitContext *pb, int i, int k, int limit, int esc_len){
int v;
v = 2*i-1;
if (v<0) v ^= -1;
set_ur_golomb(pb, v, k, limit, esc_len);
}