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author | FreeArtMan <dos21h@gmail.com> | 2016-05-08 16:02:01 +0100 |
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committer | FreeArtMan <dos21h@gmail.com> | 2016-05-08 16:02:01 +0100 |
commit | e42911405c4bc2f8c097f47d4598baf8522ef3da (patch) | |
tree | 9eb767c5e6a4443e8773b18ea76cf4216f6c8758 /filt/filt_5th.c | |
parent | 9b95088bddcf1f83e3a8f73f08f49b38ecb0f500 (diff) | |
download | radiola-master.tar.gz radiola-master.zip |
Diffstat (limited to 'filt/filt_5th.c')
-rw-r--r-- | filt/filt_5th.c | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/filt/filt_5th.c b/filt/filt_5th.c deleted file mode 100644 index 23d5aab..0000000 --- a/filt/filt_5th.c +++ /dev/null @@ -1,32 +0,0 @@ -#include "filt.h" - -void f_5th(int16_t *data, int length, int16_t *hist) -/* for half of interleaved data */ -{ - int i; - int16_t a, b, c, d, e, f; - a = hist[1]; - b = hist[2]; - c = hist[3]; - d = hist[4]; - e = hist[5]; - f = data[0]; - /* a downsample should improve resolution, so don't fully shift */ - data[0] = (a + (b+e)*5 + (c+d)*10 + f) >> 4; - for (i=4; i<length; i+=4) { - a = c; - b = d; - c = e; - d = f; - e = data[i-2]; - f = data[i]; - data[i/2] = (a + (b+e)*5 + (c+d)*10 + f) >> 4; - } - /* archive */ - hist[0] = a; - hist[1] = b; - hist[2] = c; - hist[3] = d; - hist[4] = e; - hist[5] = f; -} |