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// 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/stereo_panner_handler.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_stereo_panner_options.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.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/modules/webaudio/base_audio_context.h"
#include "third_party/blink/renderer/platform/audio/stereo_panner.h"
#include "third_party/blink/renderer/platform/bindings/exception_messages.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"
namespace blink {
namespace {
// A PannerNode only supports 1 or 2 channels
constexpr unsigned kMinimumOutputChannels = 1;
constexpr unsigned kMaximumOutputChannels = 2;
} // namespace
StereoPannerHandler::StereoPannerHandler(AudioNode& node,
float sample_rate,
AudioParamHandler& pan)
: AudioHandler(NodeType::kNodeTypeStereoPanner, node, sample_rate),
pan_(&pan),
sample_accurate_pan_values_(
GetDeferredTaskHandler().RenderQuantumFrames()) {
AddInput();
AddOutput(kMaximumOutputChannels);
// The node-specific default mixing rules declare that StereoPannerNode
// can handle mono to stereo and stereo to stereo conversion.
channel_count_ = kMaximumOutputChannels;
SetInternalChannelCountMode(V8ChannelCountMode::Enum::kClampedMax);
SetInternalChannelInterpretation(AudioBus::kSpeakers);
Initialize();
}
scoped_refptr<StereoPannerHandler> StereoPannerHandler::Create(
AudioNode& node,
float sample_rate,
AudioParamHandler& pan) {
return base::AdoptRef(new StereoPannerHandler(node, sample_rate, pan));
}
StereoPannerHandler::~StereoPannerHandler() {
Uninitialize();
}
void StereoPannerHandler::Process(uint32_t frames_to_process) {
AudioBus* output_bus = Output(0).Bus();
if (!IsInitialized() || !Input(0).IsConnected() || !stereo_panner_.get()) {
output_bus->Zero();
return;
}
scoped_refptr<AudioBus> input_bus = Input(0).Bus();
if (!input_bus) {
output_bus->Zero();
return;
}
bool is_sample_accurate = pan_->HasSampleAccurateValues();
if (is_sample_accurate && pan_->IsAudioRate()) {
// Apply sample-accurate panning specified by AudioParam automation.
DCHECK_LE(frames_to_process, sample_accurate_pan_values_.size());
float* pan_values = sample_accurate_pan_values_.Data();
pan_->CalculateSampleAccurateValues(
sample_accurate_pan_values_.as_span().first(frames_to_process));
stereo_panner_->PanWithSampleAccurateValues(input_bus.get(), output_bus,
pan_values, frames_to_process);
return;
}
// The pan value is not sample-accurate or not a-rate. In this case, we have
// a fixed pan value for the render and just need to incorporate any inputs to
// the value, if any.
float pan_value = is_sample_accurate ? pan_->FinalValue() : pan_->Value();
stereo_panner_->PanToTargetValue(input_bus.get(), output_bus, pan_value,
frames_to_process);
}
void StereoPannerHandler::ProcessOnlyAudioParams(uint32_t frames_to_process) {
// TODO(crbug.com/40637820): Eventually, the render quantum size will no
// longer be hardcoded as 128. At that point, we'll need to switch from
// stack allocation to heap allocation.
constexpr unsigned render_quantum_frames_expected = 128;
CHECK_EQ(GetDeferredTaskHandler().RenderQuantumFrames(),
render_quantum_frames_expected);
float values[render_quantum_frames_expected];
DCHECK_LE(frames_to_process, render_quantum_frames_expected);
pan_->CalculateSampleAccurateValues(
base::span(values).first(frames_to_process));
}
void StereoPannerHandler::Initialize() {
if (IsInitialized()) {
return;
}
stereo_panner_ = std::make_unique<StereoPanner>(Context()->sampleRate());
AudioHandler::Initialize();
}
void StereoPannerHandler::SetChannelCount(unsigned channel_count,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
DeferredTaskHandler::GraphAutoLocker locker(Context());
if (channel_count >= kMinimumOutputChannels &&
channel_count <= kMaximumOutputChannels) {
if (channel_count_ != channel_count) {
channel_count_ = channel_count;
if (InternalChannelCountMode() != V8ChannelCountMode::Enum::kMax) {
UpdateChannelsForInputs();
}
}
} else {
exception_state.ThrowDOMException(
DOMExceptionCode::kNotSupportedError,
ExceptionMessages::IndexOutsideRange<uint32_t>(
"channelCount", channel_count, kMinimumOutputChannels,
ExceptionMessages::kInclusiveBound, kMaximumOutputChannels,
ExceptionMessages::kInclusiveBound));
}
}
void StereoPannerHandler::SetChannelCountMode(V8ChannelCountMode::Enum mode,
ExceptionState& exception_state) {
DCHECK(IsMainThread());
DeferredTaskHandler::GraphAutoLocker locker(Context());
V8ChannelCountMode::Enum old_mode = InternalChannelCountMode();
if (mode == V8ChannelCountMode::Enum::kClampedMax ||
mode == V8ChannelCountMode::Enum::kExplicit) {
new_channel_count_mode_ = mode;
} else if (mode == V8ChannelCountMode::Enum::kMax) {
// This is not supported for a StereoPannerNode, which can only handle
// 1 or 2 channels.
exception_state.ThrowDOMException(DOMExceptionCode::kNotSupportedError,
"StereoPanner: 'max' is not allowed");
new_channel_count_mode_ = old_mode;
} else {
// Do nothing for other invalid values.
new_channel_count_mode_ = old_mode;
}
if (new_channel_count_mode_ != old_mode) {
Context()->GetDeferredTaskHandler().AddChangedChannelCountMode(this);
}
}
} // namespace blink
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