1 files changed, 47 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/test/echo_canceller_test_tools.h b/third_party/libwebrtc/modules/audio_processing/test/echo_canceller_test_tools.h
new file mode 100644
index 0000000000..0d70cd39c6
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+++ b/third_party/libwebrtc/modules/audio_processing/test/echo_canceller_test_tools.h
@@ -0,0 +1,47 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_TEST_ECHO_CANCELLER_TEST_TOOLS_H_
+#define MODULES_AUDIO_PROCESSING_TEST_ECHO_CANCELLER_TEST_TOOLS_H_
+
+#include <algorithm>
+#include <vector>
+
+#include "api/array_view.h"
+#include "rtc_base/random.h"
+
+namespace webrtc {
+
+// Randomizes the elements in a vector with values -32767.f:32767.f.
+void RandomizeSampleVector(Random* random_generator, rtc::ArrayView<float> v);
+
+// Randomizes the elements in a vector with values -amplitude:amplitude.
+void RandomizeSampleVector(Random* random_generator,
+                           rtc::ArrayView<float> v,
+                           float amplitude);
+
+// Class for delaying a signal a fixed number of samples.
+template <typename T>
+class DelayBuffer {
+ public:
+  explicit DelayBuffer(size_t delay) : buffer_(delay) {}
+  ~DelayBuffer() = default;
+
+  // Produces a delayed signal copy of x.
+  void Delay(rtc::ArrayView<const T> x, rtc::ArrayView<T> x_delayed);
+
+ private:
+  std::vector<T> buffer_;
+  size_t next_insert_index_ = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_TEST_ECHO_CANCELLER_TEST_TOOLS_H_