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audioconvert: fix dither scale

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Rectangular dither should be [-0.5, 0.5]
Triangular dither should be [-1.0, 1.0]
Noise should add extra bits.
This commit is contained in:
Wim Taymans 2022-07-11 17:19:28 +02:00
parent e313149f7f
commit 68f883ff77
4 changed files with 23 additions and 3 deletions
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4
spa/plugins/audioconvert/fmt-ops-sse2.c
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@ -585,11 +585,12 @@ static inline void update_dither_sse2(struct convert *conv, uint32_t n_samples)
{
uint32_t n;
const uint32_t *r = SPA_PTR_ALIGN(conv->random, 16, uint32_t);
__m128 out[1];
float *dither = SPA_PTR_ALIGN(conv->dither, 16, float);
__m128 scale = _mm_set1_ps(conv->scale), out[1];
__m128i in[2];
if (conv->method < DITHER_METHOD_TRIANGULAR) {
__m128 scale = _mm_set1_ps(conv->scale * 0.5f);
for (n = 0; n < n_samples; n += 4) {
in[0] = _MM_XORSHIFT_EPI32(r);
out[0] = _mm_cvtepi32_ps(_MM_XORSHIFT_EPI32(r));
@ -597,6 +598,7 @@ static inline void update_dither_sse2(struct convert *conv, uint32_t n_samples)
_mm_store_ps(&dither[n], out[0]);
}
} else {
__m128 scale = _mm_set1_ps(conv->scale);
for (n = 0; n < n_samples; n += 4) {
in[0] = _mm_add_epi32( _MM_XORSHIFT_EPI32(r), _MM_XORSHIFT_EPI32(r));
out[0] = _mm_cvtepi32_ps(in[0]);