- const auto sample_volume = (prev_volume - (prev_volume * n)/n_samples) + (next_volume * n)/n_samples;\r
- const auto sample = static_cast<int32_t>((static_cast<int64_t>(item.audio_data[n])*sample_volume)/BASE);\r
- result[n] = result[n] + sample;\r
+ const float alpha = n * delta;\r
+ const float volume = prev_volume * (1.0f - alpha) + next_volume * alpha;\r
+\r
+ auto sample_epi32 = _mm_loadl_epi64(reinterpret_cast<__m128i*>(&item.audio_data[n*2]));\r
+\r
+ auto sample_ps = _mm_cvtepi32_ps(sample_epi32); \r
+ sample_ps = _mm_mul_ps(sample_ps, _mm_set1_ps(volume)); \r
+\r
+ auto res_sample_epi32 = _mm_loadl_epi64(reinterpret_cast<__m128i*>(&result[n*2]));\r
+ auto res_sample_ps = _mm_cvtepi32_ps(res_sample_epi32); \r
+\r
+ res_sample_ps = _mm_add_ps(sample_ps, res_sample_ps);\r
+ res_sample_epi32 = _mm_cvtps_epi32(res_sample_ps);\r
+ \r
+ _mm_storel_epi64(reinterpret_cast<__m128i*>(&result[n*2]), res_sample_epi32);\r