1 files changed, 99 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/platform/audio/direct_convolver.cc b/chromium/third_party/blink/renderer/platform/audio/direct_convolver.cc
new file mode 100644
index 00000000000..a07206cc23b
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+++ b/chromium/third_party/blink/renderer/platform/audio/direct_convolver.cc
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2012 Intel Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "third_party/blink/renderer/platform/audio/direct_convolver.h"
+
+#include <utility>
+
+#include "build/build_config.h"
+#include "third_party/blink/renderer/platform/audio/vector_math.h"
+
+#if defined(OS_MACOSX)
+#include <Accelerate/Accelerate.h>
+#endif
+
+#if defined(ARCH_CPU_X86_FAMILY) && !defined(OS_MACOSX)
+#include <emmintrin.h>
+#endif
+
+namespace blink {
+
+namespace {
+using VectorMath::Conv;
+using VectorMath::PrepareFilterForConv;
+}  // namespace
+
+DirectConvolver::DirectConvolver(
+    size_t input_block_size,
+    std::unique_ptr<AudioFloatArray> convolution_kernel)
+    : input_block_size_(input_block_size),
+      buffer_(input_block_size * 2),
+      convolution_kernel_(std::move(convolution_kernel)) {
+  size_t kernel_size = ConvolutionKernelSize();
+  PrepareFilterForConv(convolution_kernel_->Data() + kernel_size - 1, -1,
+                       kernel_size, &prepared_convolution_kernel_);
+}
+
+void DirectConvolver::Process(const float* source_p,
+                              float* dest_p,
+                              size_t frames_to_process) {
+  DCHECK_EQ(frames_to_process, input_block_size_);
+  if (frames_to_process != input_block_size_)
+    return;
+
+  // Only support kernelSize <= m_inputBlockSize
+  size_t kernel_size = ConvolutionKernelSize();
+  DCHECK_LE(kernel_size, input_block_size_);
+  if (kernel_size > input_block_size_)
+    return;
+
+  float* kernel_p = convolution_kernel_->Data();
+
+  // Sanity check
+  bool is_copy_good = kernel_p && source_p && dest_p && buffer_.Data();
+  DCHECK(is_copy_good);
+  if (!is_copy_good)
+    return;
+
+  float* input_p = buffer_.Data() + input_block_size_;
+
+  // Copy samples to 2nd half of input buffer.
+  memcpy(input_p, source_p, sizeof(float) * frames_to_process);
+
+  Conv(input_p - kernel_size + 1, 1, kernel_p + kernel_size - 1, -1, dest_p, 1,
+       frames_to_process, kernel_size, &prepared_convolution_kernel_);
+
+  // Copy 2nd half of input buffer to 1st half.
+  memcpy(buffer_.Data(), input_p, sizeof(float) * frames_to_process);
+}
+
+void DirectConvolver::Reset() {
+  buffer_.Zero();
+}
+
+}  // namespace blink