| /* |
| * 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. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 |
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| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_CONVOLVER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_CONVOLVER_H_ |
| |
| #include <memory> |
| |
| #include "third_party/blink/renderer/platform/audio/audio_array.h" |
| #include "third_party/blink/renderer/platform/audio/direct_convolver.h" |
| #include "third_party/blink/renderer/platform/audio/fft_convolver.h" |
| #include "third_party/blink/renderer/platform/audio/reverb_accumulation_buffer.h" |
| #include "third_party/blink/renderer/platform/audio/reverb_convolver_stage.h" |
| #include "third_party/blink/renderer/platform/audio/reverb_input_buffer.h" |
| #include "third_party/blink/renderer/platform/scheduler/public/thread.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/vector.h" |
| |
| namespace blink { |
| |
| class AudioChannel; |
| |
| class PLATFORM_EXPORT ReverbConvolver { |
| USING_FAST_MALLOC(ReverbConvolver); |
| |
| public: |
| // maxFFTSize can be adjusted (from say 2048 to 32768) depending on how much |
| // precision is necessary. For certain tweaky de-convolving applications the |
| // phase errors add up quickly and lead to non-sensical results with larger |
| // FFT sizes and single-precision floats. In these cases 2048 is a good |
| // size. If not doing multi-threaded convolution, then should not go > 8192. |
| ReverbConvolver(AudioChannel* impulse_response, |
| size_t render_slice_size, |
| size_t max_fft_size, |
| size_t convolver_render_phase, |
| bool use_background_threads); |
| ~ReverbConvolver(); |
| |
| void Process(const AudioChannel* source_channel, |
| AudioChannel* destination_channel, |
| uint32_t frames_to_process); |
| void Reset(); |
| |
| ReverbInputBuffer* InputBuffer() { return &input_buffer_; } |
| |
| size_t LatencyFrames() const; |
| |
| private: |
| void ProcessInBackground(); |
| |
| Vector<std::unique_ptr<ReverbConvolverStage>> stages_; |
| Vector<std::unique_ptr<ReverbConvolverStage>> background_stages_; |
| size_t impulse_response_length_; |
| |
| ReverbAccumulationBuffer accumulation_buffer_; |
| |
| // One or more background threads read from this input buffer which is fed |
| // from the realtime thread. |
| ReverbInputBuffer input_buffer_; |
| |
| // First stage will be of size m_minFFTSize. Each next stage will be twice as |
| // big until we hit m_maxFFTSize. |
| size_t min_fft_size_; |
| size_t max_fft_size_; |
| |
| // But don't exceed this size in the real-time thread (if we're doing |
| // background processing). |
| size_t max_realtime_fft_size_; |
| |
| // Background thread and synchronization |
| std::unique_ptr<Thread> background_thread_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ReverbConvolver); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_REVERB_CONVOLVER_H_ |