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resamplers: Improve performance of peaks resampler

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This is mainly achieved by special-casing the common 1ch float case,
which is used by applications such as pavucontrol.
This commit is contained in:
Maarten Bosmans 2011-11-02 21:54:17 +01:00 • committed by Colin Guthrie
parent 115d903ab7
commit 40e35efbce
1 changed files with 26 additions and 11 deletions
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37
src/pulsecore/resampler.c
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@ -1451,6 +1451,8 @@ static void peaks_resample(pa_resampler *r, const pa_memchunk *input, unsigned i
pa_assert(input);
pa_assert(output);
pa_assert(out_n_frames);
pa_assert(r->i_ss.rate >= r->o_ss.rate);
pa_assert(r->work_format == PA_SAMPLE_S16NE || r->work_format == PA_SAMPLE_FLOAT32NE);
fz = r->w_sz * r->o_ss.channels;
@ -1464,19 +1466,34 @@ static void peaks_resample(pa_resampler *r, const pa_memchunk *input, unsigned i
i_end = (((r->peaks.o_counter+1) * r->i_ss.rate) / r->o_ss.rate);
i_end = i_end > r->peaks.i_counter ? i_end - r->peaks.i_counter : 0;
pa_assert(o_index * fz < pa_memblock_get_length(output->memblock));
pa_assert_fp(o_index * fz < pa_memblock_get_length(output->memblock));
if (r->work_format == PA_SAMPLE_S16NE) {
/* 1ch float is treated separately, because that is the common case */
if (r->o_ss.channels == 1 && r->work_format == PA_SAMPLE_FLOAT32NE) {
float *s = (float*) src + i;
float *d = (float*) dst + o_index;
for (; i < i_end && i < in_n_frames; i++) {
float n = fabsf(*s++);
if (n > r->peaks.max_f[0])
r->peaks.max_f[0] = n;
}
if (i == i_end) {
*d = r->peaks.max_f[0];
r->peaks.max_f[0] = 0;
o_index++, r->peaks.o_counter++;
}
} else if (r->work_format == PA_SAMPLE_S16NE) {
int16_t *s = (int16_t*) ((uint8_t*) src + fz * i);
int16_t *d = (int16_t*) ((uint8_t*) dst + fz * o_index);
for (; i < i_end && i < in_n_frames; i++)
for (c = 0; c < r->o_ss.channels; c++, s++) {
int16_t n;
for (c = 0; c < r->o_ss.channels; c++) {
int16_t n = abs(*s++);
n = (int16_t) (*s < 0 ? -*s : *s);
if (PA_UNLIKELY(n > r->peaks.max_i[c]))
if (n > r->peaks.max_i[c])
r->peaks.max_i[c] = n;
}
@ -1491,11 +1508,9 @@ static void peaks_resample(pa_resampler *r, const pa_memchunk *input, unsigned i
float *s = (float*) ((uint8_t*) src + fz * i);
float *d = (float*) ((uint8_t*) dst + fz * o_index);
pa_assert(r->work_format == PA_SAMPLE_FLOAT32NE);
for (; i < i_end && i < in_n_frames; i++)
for (c = 0; c < r->o_ss.channels; c++, s++) {
float n = fabsf(*s);
for (c = 0; c < r->o_ss.channels; c++) {
float n = fabsf(*s++);
if (n > r->peaks.max_f[c])
r->peaks.max_f[c] = n;