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/*
* Copyright (C) 2012, Intel Corporation. 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_basic_inspector_node.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"
namespace blink {
AudioBasicInspectorHandler::AudioBasicInspectorHandler(NodeType node_type,
AudioNode& node,
float sample_rate)
: AudioHandler(node_type, node, sample_rate), need_automatic_pull_(false) {
AddInput();
}
// We override pullInputs() as an optimization allowing this node to take
// advantage of in-place processing, where the input is simply passed through
// unprocessed to the output.
// Note: this only applies if the input and output channel counts match.
void AudioBasicInspectorHandler::PullInputs(uint32_t frames_to_process) {
// Render input stream - try to render directly into output bus for
// pass-through processing where process() doesn't need to do anything...
Input(0).Pull(Output(0).Bus(), frames_to_process);
}
void AudioBasicInspectorHandler::CheckNumberOfChannelsForInput(
AudioNodeInput* input) {
DCHECK(Context()->IsAudioThread());
Context()->AssertGraphOwner();
DCHECK_EQ(input, &this->Input(0));
unsigned number_of_channels = input->NumberOfChannels();
if (number_of_channels != Output(0).NumberOfChannels()) {
// This will propagate the channel count to any nodes connected further
// downstream in the graph.
Output(0).SetNumberOfChannels(number_of_channels);
}
AudioHandler::CheckNumberOfChannelsForInput(input);
UpdatePullStatusIfNeeded();
}
void AudioBasicInspectorHandler::UpdatePullStatusIfNeeded() {
Context()->AssertGraphOwner();
if (Output(0).IsConnected()) {
// When an AudioBasicInspectorNode is connected to a downstream node, it
// will get pulled by the downstream node, thus remove it from the context's
// automatic pull list.
if (need_automatic_pull_) {
Context()->GetDeferredTaskHandler().RemoveAutomaticPullNode(this);
need_automatic_pull_ = false;
}
} else {
unsigned number_of_input_connections =
Input(0).NumberOfRenderingConnections();
if (number_of_input_connections && !need_automatic_pull_) {
// When an AudioBasicInspectorNode is not connected to any downstream node
// while still connected from upstream node(s), add it to the context's
// automatic pull list.
Context()->GetDeferredTaskHandler().AddAutomaticPullNode(this);
need_automatic_pull_ = true;
} else if (!number_of_input_connections && need_automatic_pull_) {
// The AudioBasicInspectorNode is connected to nothing and is
// not an AnalyserNode, remove it from the context's automatic
// pull list. AnalyserNode's need to be pulled even with no
// inputs so that the internal state gets updated to hold the
// right time and FFT data.
Context()->GetDeferredTaskHandler().RemoveAutomaticPullNode(this);
need_automatic_pull_ = false;
}
}
}
} // namespace blink
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