convolver_handler.cc | Explore in Territory

// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/modules/webaudio/convolver_handler.h"

#include <memory>

#include "base/metrics/histogram_macros.h"
#include "base/synchronization/lock.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_convolver_options.h"
#include "third_party/blink/renderer/modules/webaudio/audio_buffer.h"
#include "third_party/blink/renderer/modules/webaudio/audio_graph_tracer.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node_input.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node_output.h"
#include "third_party/blink/renderer/platform/audio/reverb.h"
#include "third_party/blink/renderer/platform/bindings/exception_messages.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"

namespace blink {

namespace {

// Note about empirical tuning:
// The maximum FFT size affects reverb performance and accuracy.
// If the reverb is single-threaded and processes entirely in the real-time
// audio thread, it's important not to make this too high.  In this case 8192 is
// a good value.  But, the Reverb object is multi-threaded, so we want this as
// high as possible without losing too much accuracy.  Very large FFTs will have
// worse phase errors. Given these constraints 32768 is a good compromise.
constexpr unsigned kMaxFftSize = …;

constexpr unsigned kDefaultNumberOfInputChannels = …;
constexpr unsigned kDefaultNumberOfOutputChannels = …;

}  // namespace

ConvolverHandler::ConvolverHandler(AudioNode& node, float sample_rate)
    : … { … }

scoped_refptr<ConvolverHandler> ConvolverHandler::Create(AudioNode& node,
                                                         float sample_rate) { … }

ConvolverHandler::~ConvolverHandler() { … }

void ConvolverHandler::Process(uint32_t frames_to_process) { … }

void ConvolverHandler::SetBuffer(AudioBuffer* buffer,
                                 ExceptionState& exception_state) { … }

bool ConvolverHandler::RequiresTailProcessing() const { … }

double ConvolverHandler::TailTime() const { … }

double ConvolverHandler::LatencyTime() const { … }

unsigned ConvolverHandler::ComputeNumberOfOutputChannels(
    unsigned input_channels,
    unsigned response_channels) const { … }

void ConvolverHandler::SetChannelCount(unsigned channel_count,
                                       ExceptionState& exception_state) { … }

void ConvolverHandler::SetChannelCountMode(const String& mode,
                                           ExceptionState& exception_state) { … }

void ConvolverHandler::CheckNumberOfChannelsForInput(AudioNodeInput* input) { … }

}  // namespace blink
chromium/third_party/blink/renderer/modules/webaudio/convolver_handler.cc
