third_party/WebKit/Source/platform/audio/StereoPanner.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef StereoPanner_h
   6 #define StereoPanner_h
   7
   8 #include "platform/audio/Spatializer.h"
   9
  10 namespace blink {
  11
  12 // Common type of stereo panner as found in normal audio mixing equipment.
  13 // See: http://webaudio.github.io/web-audio-api/#the-stereopannernode-interface
  14
  15 class PLATFORM_EXPORT StereoPanner final : public Spatializer {
  16 public:
  17     explicit StereoPanner(float sampleRate);
  18
  19     void panWithSampleAccurateValues(const AudioBus* inputBus, AudioBus* outputBuf, const float* panValues, size_t framesToProcess) override;
  20     void panToTargetValue(const AudioBus* inputBus, AudioBus* outputBuf, float panValue, size_t framesToProcess) override;
  21
  22     void reset() override { }
  23
  24     double tailTime() const override { return 0; }
  25     double latencyTime() const override { return 0; }
  26
  27 private:
  28     bool m_isFirstRender;
  29     double m_smoothingConstant;
  30
  31     double m_pan;
  32 };
  33
  34 } // namespace blink
  35
  36 #endif // StereoPanner_h