chromium/third_party/blink/renderer/modules/webaudio/gain_handler.cc

// 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/gain_handler.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/audio_bus.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"

namespace blink {

namespace {

constexpr unsigned kNumberOfOutputChannels = …;

}  // namespace

GainHandler::GainHandler(AudioNode& node,
                         float sample_rate,
                         AudioParamHandler& gain)
    : … { … }

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

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

void GainHandler::ProcessOnlyAudioParams(uint32_t frames_to_process) { … }

// As soon as we know the channel count of our input, we can lazily initialize.
// Sometimes this may be called more than once with different channel counts, in
// which case we must safely uninitialize and then re-initialize with the new
// channel count.
void GainHandler::CheckNumberOfChannelsForInput(AudioNodeInput* input) { … }

}  // namespace blink