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avcodec/mpegaudio: use predefined M_SQRT2

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M_SQRT2 is defined in math.h, or in avutil/mathematics.h for
compatibility hacks. This uses this value instead of an ad-hoc define.

Fixed point values produced by FIX() remain identical.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-11-14 10:52:30 -05:00
parent c5fa42c69a
commit 11f0acf829
2 changed files with 2 additions and 4 deletions
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4
libavcodec/mpegaudioenc_template.c
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@ -244,11 +244,11 @@ static void idct32(int *out, int *tab)
do {
int x1, x2, x3, x4;
x3 = MUL(t[16], FIX(SQRT2*0.5));
x3 = MUL(t[16], FIX(M_SQRT2*0.5));
x4 = t[0] - x3;
x3 = t[0] + x3;
x2 = MUL(-(t[24] + t[8]), FIX(SQRT2*0.5));
x2 = MUL(-(t[24] + t[8]), FIX(M_SQRT2*0.5));
x1 = MUL((t[8] - x2), xp[0]);
x2 = MUL((t[8] + x2), xp[1]);

2
libavcodec/mpegaudiotab.h
View File

@ -33,8 +33,6 @@
#include <stdint.h>
#include "mpegaudio.h"
#define SQRT2 1.41421356237309514547
static const int costab32[30] = {
FIX(0.54119610014619701222),
FIX(1.3065629648763763537),