| /* |
| * Copyright (C) 2010, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_HRTF_PANNER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_HRTF_PANNER_H_ |
| |
| #include "third_party/blink/renderer/platform/audio/audio_delay_dsp_kernel.h" |
| #include "third_party/blink/renderer/platform/audio/fft_convolver.h" |
| #include "third_party/blink/renderer/platform/audio/hrtf_database_loader.h" |
| #include "third_party/blink/renderer/platform/audio/panner.h" |
| |
| namespace blink { |
| |
| class PLATFORM_EXPORT HRTFPanner final : public Panner { |
| public: |
| HRTFPanner(float sample_rate, HRTFDatabaseLoader*); |
| ~HRTFPanner() override; |
| |
| // Panner |
| void Pan(double azimuth, |
| double elevation, |
| const AudioBus* input_bus, |
| AudioBus* output_bus, |
| uint32_t frames_to_process, |
| AudioBus::ChannelInterpretation) override; |
| void PanWithSampleAccurateValues(double* azimuth, |
| double* elevation, |
| const AudioBus* input_bus, |
| AudioBus* output_bus, |
| uint32_t frames_to_process, |
| AudioBus::ChannelInterpretation) override; |
| |
| void Reset() override; |
| |
| size_t FftSize() const { return FftSizeForSampleRate(sample_rate_); } |
| static size_t FftSizeForSampleRate(float sample_rate); |
| |
| float SampleRate() const { return sample_rate_; } |
| |
| double TailTime() const override; |
| double LatencyTime() const override; |
| bool RequiresTailProcessing() const override; |
| |
| private: |
| // Given an azimuth angle in the range -180 -> +180, returns the corresponding |
| // azimuth index for the database, and azimuthBlend which is an interpolation |
| // value from 0 -> 1. |
| int CalculateDesiredAzimuthIndexAndBlend(double azimuth, |
| double& azimuth_blend); |
| |
| scoped_refptr<HRTFDatabaseLoader> database_loader_; |
| |
| float sample_rate_; |
| |
| // We maintain two sets of convolvers for smooth cross-faded interpolations |
| // when then azimuth and elevation are dynamically changing. When the |
| // azimuth and elevation are not changing, we simply process with one |
| // of the two sets. Initially we use CrossfadeSelection1 corresponding to |
| // m_convolverL1 and m_convolverR1. Whenever the azimuth or elevation |
| // changes, a crossfade is initiated to transition to the new position. So if |
| // we're currently processing with CrossfadeSelection1, then we transition to |
| // CrossfadeSelection2 (and vice versa). If we're in the middle of a |
| // transition, then we wait until it is complete before initiating a new |
| // transition. |
| |
| // Selects either the convolver set (m_convolverL1, m_convolverR1) or |
| // (m_convolverL2, m_convolverR2). |
| enum CrossfadeSelection { kCrossfadeSelection1, kCrossfadeSelection2 }; |
| |
| CrossfadeSelection crossfade_selection_; |
| |
| // azimuth/elevation for CrossfadeSelection1. |
| int azimuth_index1_; |
| double elevation1_; |
| |
| // azimuth/elevation for CrossfadeSelection2. |
| int azimuth_index2_; |
| double elevation2_; |
| |
| // A crossfade value 0 <= m_crossfadeX <= 1. |
| float crossfade_x_; |
| |
| // Per-sample-frame crossfade value increment. |
| float crossfade_incr_; |
| |
| FFTConvolver convolver_l1_; |
| FFTConvolver convolver_r1_; |
| FFTConvolver convolver_l2_; |
| FFTConvolver convolver_r2_; |
| |
| AudioDelayDSPKernel delay_line_l_; |
| AudioDelayDSPKernel delay_line_r_; |
| |
| AudioFloatArray temp_l1_; |
| AudioFloatArray temp_r1_; |
| AudioFloatArray temp_l2_; |
| AudioFloatArray temp_r2_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_HRTF_PANNER_H_ |