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/*
* 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.
*/
#include "third_party/blink/renderer/modules/webaudio/audio_node_output.h"
#include <memory>
#include "base/memory/ptr_util.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node_input.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node_wiring.h"
#include "third_party/blink/renderer/modules/webaudio/base_audio_context.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"
namespace blink {
AudioNodeOutput::AudioNodeOutput(AudioHandler* handler,
unsigned number_of_channels)
: handler_(*handler),
number_of_channels_(number_of_channels),
desired_number_of_channels_(number_of_channels) {
DCHECK_LE(number_of_channels, BaseAudioContext::MaxNumberOfChannels());
internal_bus_ = AudioBus::Create(
number_of_channels, GetDeferredTaskHandler().RenderQuantumFrames());
}
void AudioNodeOutput::Dispose() {
did_call_dispose_ = true;
GetDeferredTaskHandler().RemoveMarkedAudioNodeOutput(this);
DisconnectAll();
DCHECK(inputs_.empty());
DCHECK(params_.empty());
}
void AudioNodeOutput::SetNumberOfChannels(unsigned number_of_channels) {
DCHECK_LE(number_of_channels, BaseAudioContext::MaxNumberOfChannels());
GetDeferredTaskHandler().AssertGraphOwner();
desired_number_of_channels_ = number_of_channels;
if (GetDeferredTaskHandler().IsAudioThread()) {
// If we're in the audio thread then we can take care of it right away (we
// should be at the very start or end of a rendering quantum).
UpdateNumberOfChannels();
} else {
DCHECK(!did_call_dispose_);
// Let the context take care of it in the audio thread in the pre and post
// render tasks.
GetDeferredTaskHandler().MarkAudioNodeOutputDirty(this);
}
}
void AudioNodeOutput::UpdateInternalBus() {
if (NumberOfChannels() == internal_bus_->NumberOfChannels()) {
return;
}
internal_bus_ = AudioBus::Create(
NumberOfChannels(), GetDeferredTaskHandler().RenderQuantumFrames());
}
void AudioNodeOutput::UpdateRenderingState() {
UpdateNumberOfChannels();
rendering_fan_out_count_ = FanOutCount();
rendering_param_fan_out_count_ = ParamFanOutCount();
}
void AudioNodeOutput::UpdateNumberOfChannels() {
DCHECK(GetDeferredTaskHandler().IsAudioThread());
GetDeferredTaskHandler().AssertGraphOwner();
if (number_of_channels_ != desired_number_of_channels_) {
number_of_channels_ = desired_number_of_channels_;
UpdateInternalBus();
PropagateChannelCount();
}
}
void AudioNodeOutput::PropagateChannelCount() {
DCHECK(GetDeferredTaskHandler().IsAudioThread());
GetDeferredTaskHandler().AssertGraphOwner();
if (IsChannelCountKnown()) {
// Announce to any nodes we're connected to that we changed our channel
// count for its input.
for (AudioNodeInput* i : inputs_) {
i->Handler().CheckNumberOfChannelsForInput(i);
}
}
}
AudioBus* AudioNodeOutput::Pull(AudioBus* in_place_bus,
uint32_t frames_to_process) {
DCHECK(GetDeferredTaskHandler().IsAudioThread());
DCHECK(rendering_fan_out_count_ > 0 || rendering_param_fan_out_count_ > 0);
// Causes our AudioNode to process if it hasn't already for this render
// quantum. We try to do in-place processing (using inPlaceBus) if at all
// possible, but we can't process in-place if we're connected to more than one
// input (fan-out > 1). In this case pull() is called multiple times per
// rendering quantum, and the processIfNecessary() call below will cause our
// node to process() only the first time, caching the output in
// m_internalOutputBus for subsequent calls.
is_in_place_ =
in_place_bus && in_place_bus->NumberOfChannels() == NumberOfChannels() &&
(rendering_fan_out_count_ + rendering_param_fan_out_count_) == 1;
in_place_bus_ = is_in_place_ ? in_place_bus : nullptr;
Handler().ProcessIfNecessary(frames_to_process);
return Bus();
}
AudioBus* AudioNodeOutput::Bus() const {
DCHECK(GetDeferredTaskHandler().IsAudioThread());
return is_in_place_ ? in_place_bus_.get() : internal_bus_.get();
}
unsigned AudioNodeOutput::FanOutCount() {
GetDeferredTaskHandler().AssertGraphOwner();
return inputs_.size();
}
unsigned AudioNodeOutput::ParamFanOutCount() {
GetDeferredTaskHandler().AssertGraphOwner();
return params_.size();
}
unsigned AudioNodeOutput::RenderingFanOutCount() const {
return rendering_fan_out_count_;
}
unsigned AudioNodeOutput::RenderingParamFanOutCount() const {
DCHECK(GetDeferredTaskHandler().IsAudioThread());
return rendering_param_fan_out_count_;
}
bool AudioNodeOutput::IsConnectedDuringRendering() const {
DCHECK(GetDeferredTaskHandler().IsAudioThread());
return RenderingFanOutCount() > 0 || RenderingParamFanOutCount() > 0;
}
void AudioNodeOutput::DisconnectAllInputs() {
GetDeferredTaskHandler().AssertGraphOwner();
// Disconnect changes inputs_, so we can't iterate directly over the hash set.
Vector<AudioNodeInput*, 4> inputs(inputs_);
for (AudioNodeInput* input : inputs) {
AudioNodeWiring::Disconnect(*this, *input);
}
DCHECK(inputs_.empty());
}
void AudioNodeOutput::DisconnectAllParams() {
GetDeferredTaskHandler().AssertGraphOwner();
// Disconnect changes params_, so we can't iterate directly over the hash set.
Vector<AudioParamHandler*, 4> params(params_);
for (AudioParamHandler* param : params) {
AudioNodeWiring::Disconnect(*this, *param);
}
DCHECK(params_.empty());
}
void AudioNodeOutput::DisconnectAll() {
DisconnectAllInputs();
DisconnectAllParams();
}
void AudioNodeOutput::Disable() {
GetDeferredTaskHandler().AssertGraphOwner();
if (is_enabled_) {
is_enabled_ = false;
for (AudioNodeInput* input : inputs_) {
AudioNodeWiring::Disable(*this, *input);
}
}
}
void AudioNodeOutput::Enable() {
GetDeferredTaskHandler().AssertGraphOwner();
if (!is_enabled_) {
is_enabled_ = true;
for (AudioNodeInput* input : inputs_) {
AudioNodeWiring::Enable(*this, *input);
}
}
}
} // namespace blink
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