+ audio_buffer mix()\r
+ { \r
+ // NOTE: auto data should be larger than format_desc_.audio_samples_per_frame to allow sse to read/write beyond size.\r
+\r
+ auto intermediate = std::vector<float, tbb::cache_aligned_allocator<float>>(format_desc_.audio_samples_per_frame+128, 0.0f);\r
+\r
+ std::map<const void*, core::frame_transform> next_frame_transforms;\r
+ \r
+ tbb::affinity_partitioner ap;\r
+\r
+ BOOST_FOREACH(auto& item, items)\r
+ { \r
+ const auto next = item.transform;\r
+ auto prev = next;\r
+\r
+ const auto it = prev_frame_transforms_.find(item.tag);\r
+ if(it != prev_frame_transforms_.end())\r
+ prev = it->second;\r
+ \r
+ next_frame_transforms[item.tag] = next; // Store all active tags, inactive tags will be removed at the end.\r
+\r
+ if(next.volume < 0.001 && prev.volume < 0.001)\r
+ continue;\r
+ \r
+ if(static_cast<size_t>(item.audio_data.size()) != format_desc_.audio_samples_per_frame)\r
+ continue;\r
+\r
+ CASPAR_ASSERT(format_desc_.audio_channels == 2);\r
+ CASPAR_ASSERT(format_desc_.audio_samples_per_frame % 4 == 0);\r
+ \r
+ const float prev_volume = static_cast<float>(prev.volume);\r
+ const float next_volume = static_cast<float>(next.volume);\r
+ const float delta = 1.0f/static_cast<float>(format_desc_.audio_samples_per_frame/format_desc_.audio_channels);\r
+ \r
+ auto alpha_ps = _mm_setr_ps(delta, delta, 0.0f, 0.0f);\r
+ auto delta2_ps = _mm_set_ps1(delta*2.0f);\r
+ auto prev_ps = _mm_set_ps1(prev_volume);\r
+ auto next_ps = _mm_set_ps1(next_volume); \r
+\r
+ for(size_t n = 0; n < format_desc_.audio_samples_per_frame/4; ++n)\r
+ { \r
+ auto next2_ps = _mm_mul_ps(next_ps, alpha_ps);\r
+ auto prev2_ps = _mm_sub_ps(prev_ps, _mm_mul_ps(prev_ps, alpha_ps));\r
+ auto volume_ps = _mm_add_ps(next2_ps, prev2_ps);\r
+\r
+ auto sample_ps = _mm_cvtepi32_ps(_mm_load_si128(reinterpret_cast<__m128i*>(&item.audio_data[n*4])));\r
+ auto res_sample_ps = _mm_load_ps(&intermediate[n*4]); \r
+ sample_ps = _mm_mul_ps(sample_ps, volume_ps); \r
+ res_sample_ps = _mm_add_ps(sample_ps, res_sample_ps); \r
+\r
+ alpha_ps = _mm_add_ps(alpha_ps, delta2_ps);\r
+\r
+ _mm_store_ps(&intermediate[n*4], res_sample_ps);\r
+ }\r
+ }\r
+ \r
+ auto result = audio_buffer(format_desc_.audio_samples_per_frame+128); \r
+ \r
+ auto intermediate_128 = reinterpret_cast<__m128i*>(intermediate.data());\r
+ auto result_128 = reinterpret_cast<__m128i*>(result.data());\r
+ \r
+ for(size_t n = 0; n < format_desc_.audio_samples_per_frame/32; ++n)\r
+ { \r
+ auto xmm0 = _mm_load_ps(reinterpret_cast<float*>(intermediate_128++));\r
+ auto xmm1 = _mm_load_ps(reinterpret_cast<float*>(intermediate_128++));\r
+ auto xmm2 = _mm_load_ps(reinterpret_cast<float*>(intermediate_128++));\r
+ auto xmm3 = _mm_load_ps(reinterpret_cast<float*>(intermediate_128++));\r
+ auto xmm4 = _mm_load_ps(reinterpret_cast<float*>(intermediate_128++));\r
+ auto xmm5 = _mm_load_ps(reinterpret_cast<float*>(intermediate_128++));\r
+ auto xmm6 = _mm_load_ps(reinterpret_cast<float*>(intermediate_128++));\r
+ auto xmm7 = _mm_load_ps(reinterpret_cast<float*>(intermediate_128++));\r
+ \r
+ _mm_stream_si128(result_128++, _mm_cvtps_epi32(xmm0));\r
+ _mm_stream_si128(result_128++, _mm_cvtps_epi32(xmm1));\r
+ _mm_stream_si128(result_128++, _mm_cvtps_epi32(xmm2));\r
+ _mm_stream_si128(result_128++, _mm_cvtps_epi32(xmm3));\r
+ _mm_stream_si128(result_128++, _mm_cvtps_epi32(xmm4));\r
+ _mm_stream_si128(result_128++, _mm_cvtps_epi32(xmm5));\r
+ _mm_stream_si128(result_128++, _mm_cvtps_epi32(xmm6));\r
+ _mm_stream_si128(result_128++, _mm_cvtps_epi32(xmm7));\r
+ }\r
+\r
+ items.clear();\r
+ prev_frame_transforms_ = std::move(next_frame_transforms); \r
+\r
+ result.resize(format_desc_.audio_samples_per_frame);\r