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optionally merge postscale into quantization table for the float aan dct

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Originally committed as revision 2420 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2003-10-23 09:11:56 +00:00
parent 10becaaf12
commit b4c3816cfa
4 changed files with 30 additions and 11 deletions
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21
libavcodec/faandct.c
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@@ -32,6 +32,11 @@
#include "faandct.h"
#define FLOAT float
#ifdef FAAN_POSTSCALE
# define SCALE(x) postscale[x]
#else
# define SCALE(x) 1
#endif
//numbers generated by simple c code (not as accurate as they could be)
/*
@@ -130,12 +135,12 @@ void ff_faandct(DCTELEM * data)
tmp11= tmp1 + tmp2;
tmp12= tmp1 - tmp2;
data[8*0 + i]= lrint(postscale[8*0 + i] * (tmp10 + tmp11));
data[8*4 + i]= lrint(postscale[8*4 + i] * (tmp10 - tmp11));
data[8*0 + i]= lrint(SCALE(8*0 + i) * (tmp10 + tmp11));
data[8*4 + i]= lrint(SCALE(8*4 + i) * (tmp10 - tmp11));
z1= (tmp12 + tmp13)* A1;
data[8*2 + i]= lrint(postscale[8*2 + i] * (tmp13 + z1));
data[8*6 + i]= lrint(postscale[8*6 + i] * (tmp13 - z1));
data[8*2 + i]= lrint(SCALE(8*2 + i) * (tmp13 + z1));
data[8*6 + i]= lrint(SCALE(8*6 + i) * (tmp13 - z1));
tmp10= tmp4 + tmp5;
tmp11= tmp5 + tmp6;
@@ -149,9 +154,9 @@ void ff_faandct(DCTELEM * data)
z11= tmp7 + z3;
z13= tmp7 - z3;
data[8*5 + i]= lrint(postscale[8*5 + i] * (z13 + z2));
data[8*3 + i]= lrint(postscale[8*3 + i] * (z13 - z2));
data[8*1 + i]= lrint(postscale[8*1 + i] * (z11 + z4));
data[8*7 + i]= lrint(postscale[8*7 + i] * (z11 - z4));
data[8*5 + i]= lrint(SCALE(8*5 + i) * (z13 + z2));
data[8*3 + i]= lrint(SCALE(8*3 + i) * (z13 - z2));
data[8*1 + i]= lrint(SCALE(8*1 + i) * (z11 + z4));
data[8*7 + i]= lrint(SCALE(8*7 + i) * (z11 - z4));
}
}