devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

Wrap filter_bishelf_coefs with HAVE_SW_TONE_CONTROLS to not waste bytes on targets that don't use it.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12490 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2007-02-26 00:58:07 +00:00
parent a7fabf0741
commit deb69d280d
1 changed files with 2 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

2
apps/eq.c
View file

@ -147,6 +147,7 @@ void filter_shelf_coefs(unsigned long cutoff, long ad, long an, int32_t *c)
c[2] = -DIV64(a1, a0, 31);
}
#ifdef HAVE_SW_TONE_CONTROLS
/**
* Calculate second order section filter consisting of one low-shelf and one
* high-shelf section.
@ -198,6 +199,7 @@ void filter_bishelf_coefs(unsigned long cutoff_low, unsigned long cutoff_high,
*c++ = -FRACMUL_SHL(FRACMUL(a0, a3) + FRACMUL(a1, a2), rcp_a0, 5);
*c++ = -FRACMUL_SHL(FRACMUL(a1, a3), rcp_a0, 5);
}
#endif
/* Coef calculation taken from Audio-EQ-Cookbook.txt by Robert Bristow-Johnson.
* Slightly faster calculation can be done by deriving forms which use tan()