A bitexactness test for the highpass filter in the

audio processing module.

The test also adds a new helper class called
VectorBasedAudioFrame that is intended to be
reused for the bitexactness tests for the other
submodules.

BUG=webrtc:1091

Review URL: https://codereview.webrtc.org/1510493004

Cr-Commit-Position: refs/heads/master@{#11864}

webrtc/modules/audio_processing/test/audio_buffer_tools.h

@@ -0,0 +1,34 @@
+/*
+ *  Copyright (c) 2015 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 WEBRTC_MODULES_AUDIO_PROCESSING_TEST_AUDIO_BUFFER_TOOLS_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_TEST_AUDIO_BUFFER_TOOLS_H_
+
+#include <vector>
+#include "webrtc/modules/audio_processing/audio_buffer.h"
+#include "webrtc/modules/audio_processing/include/audio_processing.h"
+
+namespace webrtc {
+namespace test {
+
+// Copies a vector into an audiobuffer.
+void CopyVectorToAudioBuffer(const StreamConfig& stream_config,
+                             const std::vector<float>& source,
+                             AudioBuffer* destination);
+
+// Extracts a vector from an audiobuffer.
+std::vector<float> ExtractVectorFromAudioBuffer(
+    const StreamConfig& stream_config,
+    AudioBuffer* source);
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_TEST_AUDIO_BUFFER_TOOLS_H_