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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
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@@ -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