1 /* 2 * Copyright (C) 2010, Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 23 * DAMAGE. 24 */ 25 26 #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_EQUAL_POWER_PANNER_H_ 27 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_EQUAL_POWER_PANNER_H_ 28 29 #include "third_party/blink/renderer/platform/audio/panner.h" 30 31 namespace blink { 32 33 // Common type of stereo panner as found in normal audio mixing equipment. 34 35 class PLATFORM_EXPORT EqualPowerPanner final : public Panner { 36 public: 37 EqualPowerPanner(float sample_rate); 38 39 void Pan(double azimuth, 40 double elevation, 41 const AudioBus* input_bus, 42 AudioBus* output_buf, 43 uint32_t frames_to_process, 44 AudioBus::ChannelInterpretation) override; 45 void PanWithSampleAccurateValues(double* azimuth, 46 double* elevation, 47 const AudioBus* input_bus, 48 AudioBus* output_bus, 49 uint32_t frames_to_process, 50 AudioBus::ChannelInterpretation) override; 51 Reset()52 void Reset() override {} 53 TailTime()54 double TailTime() const override { return 0; } LatencyTime()55 double LatencyTime() const override { return 0; } RequiresTailProcessing()56 bool RequiresTailProcessing() const override { return false; } 57 58 private: 59 void CalculateDesiredGain(double& desired_gain_l, 60 double& desired_gain_r, 61 double azimuth, 62 int number_of_channels); 63 }; 64 65 } // namespace blink 66 67 #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_EQUAL_POWER_PANNER_H_ 68