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Optimize zresampler for no re-sampling case.

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This commit is contained in:
Robin Gareus 2017-11-06 00:13:14 +01:00
parent 4cdd3f5df6
commit 77a94e1015
1 changed files with 39 additions and 0 deletions
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39
libs/zita-resampler/vmresampler.cc
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@ -22,6 +22,7 @@
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <algorithm>
#include "zita-resampler/vmresampler.h"
@ -173,6 +174,44 @@ VMResampler::process (void)
ph = _phase;
dp = _pstep;
n = 2 * hl - nr;
#if 1
/* optimized full-cycle no-resampling */
if (dp == np && _qstep == np && nr == 1 && inp_count == out_count) {
if (out_count >= n) {
const unsigned int h1 = hl - 1;
const unsigned int head = out_count - h1;
const unsigned int tail = out_count - n;
memcpy (out_data, &_buff[in + hl], h1 * sizeof (float));
memcpy (&out_data[h1], inp_data, head * sizeof (float));
memcpy (_buff, &inp_data[tail], n * sizeof (float));
_index = 0;
inp_count = 0;
out_count = 0;
return 0;
}
while (out_count) {
unsigned int to_proc = std::min (out_count, _inmax - in);
memcpy (&_buff[in + n], inp_data, to_proc * sizeof (float));
memcpy (out_data, &_buff[in + hl], to_proc * sizeof (float));
inp_data += to_proc;
out_data += to_proc;
out_count -= to_proc;
in += to_proc;
if (in >= _inmax) {
memcpy (_buff, _buff + in, (2 * hl - 1) * sizeof (float));
in = 0;
}
}
inp_count = out_count;
_index = in;
return 0;
}
#endif
p1 = _buff + in;
p2 = p1 + n;