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resamplers: Optimize trivial resampler

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This improves the performance of a typical s16 2ch resampling by 88%.
This commit is contained in:
Maarten Bosmans 2011-11-23 11:40:08 +01:00 • committed by Colin Guthrie
parent 61890ae20d
commit 8539fe9765
1 changed files with 11 additions and 1 deletions
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12
src/pulsecore/resampler.c
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@ -1376,6 +1376,7 @@ static void trivial_resample(pa_resampler *r, const pa_memchunk *input, unsigned
pa_assert(input);
pa_assert(output);
pa_assert(out_n_frames);
pa_assert(r->i_ss.channels == r->o_ss.channels);
fz = r->w_sz * r->o_ss.channels;
@ -1391,7 +1392,16 @@ static void trivial_resample(pa_resampler *r, const pa_memchunk *input, unsigned
pa_assert_fp(o_index * fz < pa_memblock_get_length(output->memblock));
memcpy((uint8_t*) dst + fz * o_index, (uint8_t*) src + fz * i_index, (int) fz);
/* Directly assign some common sample sizes, use memcpy as fallback */
if (r->w_sz == 2) {
for (unsigned c = 0; c < r->o_ss.channels; c++)
((uint16_t *) dst)[o_index+c] = ((uint16_t *) src)[i_index+c];
} else if (r->w_sz == 4) {
for (unsigned c = 0; c < r->o_ss.channels; c++)
((uint32_t *) dst)[o_index+c] = ((uint32_t *) src)[i_index+c];
} else {
memcpy((uint8_t *) dst + fz * o_index, (uint8_t *) src + fz * i_index, (int) fz);
}
}
pa_memblock_release(input->memblock);