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Unified Diff: webrtc/modules/audio_processing/level_controller/down_sampler.h

Issue 2090583002: New module for the adaptive level controlling functionality in the audio processing module (Closed) Base URL: https://chromium.googlesource.com/external/webrtc.git@master
Patch Set: Corrected the initial behavior for the peak level estimate, and ensured a nonzero minimum peak leveā€¦ Created 4 years, 6 months ago
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Index: webrtc/modules/audio_processing/level_controller/down_sampler.h
diff --git a/webrtc/modules/audio_processing/level_controller/down_sampler.h b/webrtc/modules/audio_processing/level_controller/down_sampler.h
new file mode 100644
index 0000000000000000000000000000000000000000..d95a72570918b5a61b262a9d568cf97e6944f248
--- /dev/null
+++ b/webrtc/modules/audio_processing/level_controller/down_sampler.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2016 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_LEVEL_CONTROLLER_DOWN_SAMPLER_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_DOWN_SAMPLER_H_
+
+#include <memory>
+
+#include "webrtc/base/array_view.h"
+#include "webrtc/base/constructormagic.h"
+
+namespace webrtc {
+
+class ApmDataDumper;
+class BiQuadFilter;
+
+class DownSampler {
+ public:
+ DownSampler(ApmDataDumper* data_dumper, int sample_rate_hz);
hlundin-webrtc 2016/06/27 11:21:14 data_dumper is in some sense an output variable, s
peah-webrtc 2016/06/27 22:51:47 Done.
+ ~DownSampler();
hlundin-webrtc 2016/06/27 11:21:14 Do you need this? And if so, consider using = defu
peah-webrtc 2016/06/27 22:51:47 I think it is needed as the ApmDataDumper and BiQu
hlundin-webrtc 2016/06/28 11:29:00 Acknowledged.
peah-webrtc 2016/06/28 22:19:37 Acknowledged.
+
+ void DownSample(rtc::ArrayView<const float> in, rtc::ArrayView<float> out);
+
+ private:
+ ApmDataDumper* data_dumper_;
+ const int sample_rate_hz_;
+ std::unique_ptr<BiQuadFilter> low_pass_filter_;
+ int down_sampling_factor_;
+
+ RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DownSampler);
+};
+
+} // namespace webrtc
+
+#endif // WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_DOWN_SAMPLER_H_

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