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Tiny speedup by simplifying the filter wrap check.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19101 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2008-11-12 18:16:27 +00:00
parent c8d0a6522e
commit 60e16e8e7a
1 changed files with 15 additions and 16 deletions
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31
apps/codecs/demac/libdemac/filter.c
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@ -45,7 +45,7 @@ struct filter_t {
int16_t* coeffs; /* ORDER entries */ int16_t* coeffs; /* ORDER entries */
/* We store all the filter delays in a single buffer */ /* We store all the filter delays in a single buffer */
int16_t* historybuffer; /* ORDER*2 + HISTORY_SIZE entries */ int16_t* history_end;
int16_t* delay; int16_t* delay;
int16_t* adaptcoeffs; int16_t* adaptcoeffs;
@ -143,11 +143,11 @@ static void ICODE_ATTR_DEMAC do_apply_filter_3980(struct filter_t* f,
f->adaptcoeffs++; f->adaptcoeffs++;
/* Have we filled the history buffer? */ /* Have we filled the history buffer? */
if (f->delay == f->historybuffer + HISTORY_SIZE + (ORDER*2)) { if (f->delay == f->history_end) {
memmove(f->historybuffer, f->delay - (ORDER*2), memmove(f->coeffs + ORDER, f->delay - (ORDER*2),
(ORDER*2) * sizeof(int16_t)); (ORDER*2) * sizeof(int16_t));
f->delay = f->historybuffer + ORDER*2; f->adaptcoeffs = f->coeffs + ORDER*2;
f->adaptcoeffs = f->historybuffer + ORDER; f->delay = f->coeffs + ORDER*3;
} }
} }
} }
@ -188,11 +188,11 @@ static void ICODE_ATTR_DEMAC do_apply_filter_3970(struct filter_t* f,
f->adaptcoeffs++; f->adaptcoeffs++;
/* Have we filled the history buffer? */ /* Have we filled the history buffer? */
if (f->delay == f->historybuffer + HISTORY_SIZE + (ORDER*2)) { if (f->delay == f->history_end) {
memmove(f->historybuffer, f->delay - (ORDER*2), memmove(f->coeffs + ORDER, f->delay - (ORDER*2),
(ORDER*2) * sizeof(int16_t)); (ORDER*2) * sizeof(int16_t));
f->delay = f->historybuffer + ORDER*2; f->adaptcoeffs = f->coeffs + ORDER*2;
f->adaptcoeffs = f->historybuffer + ORDER; f->delay = f->coeffs + ORDER*3;
} }
} }
} }
@ -203,15 +203,14 @@ static struct filter_t filter1 IBSS_ATTR;
static void do_init_filter(struct filter_t* f, int16_t* buf) static void do_init_filter(struct filter_t* f, int16_t* buf)
{ {
f->coeffs = buf; f->coeffs = buf;
f->historybuffer = buf + ORDER; f->history_end = buf + ORDER*3 + HISTORY_SIZE;
/* Zero the output history buffer */ /* Init pointers */
memset(f->historybuffer, 0 , (ORDER*2) * sizeof(int16_t)); f->adaptcoeffs = f->coeffs + ORDER*2;
f->delay = f->historybuffer + ORDER*2; f->delay = f->coeffs + ORDER*3;
f->adaptcoeffs = f->historybuffer + ORDER;
/* Zero the co-efficients */ /* Zero coefficients and history buffer */
memset(f->coeffs, 0, ORDER * sizeof(int16_t)); memset(f->coeffs, 0, ORDER*3 * sizeof(int16_t));
/* Zero the running average */ /* Zero the running average */
f->avg = 0; f->avg = 0;