oak-editor/app/node/audio/pan/pan.cpp

/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2022 Olive Team
  Modifications Copyright (C) 2025 mikesolar

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#include "pan.h"

#include "widget/slider/floatslider.h"

namespace olive
{

const QString PanNode::kSamplesInput = QStringLiteral("samples_in");
const QString PanNode::kPanningInput = QStringLiteral("panning_in");

#define super Node

PanNode::PanNode()
{
	AddInput(kSamplesInput, NodeValue::kSamples,
			 InputFlags(kInputFlagNotKeyframable));

	AddInput(kPanningInput, NodeValue::kFloat, 0.0);
	SetInputProperty(kPanningInput, QStringLiteral("min"), -1.0);
	SetInputProperty(kPanningInput, QStringLiteral("max"), 1.0);
	SetInputProperty(kPanningInput, QStringLiteral("view"),
					 FloatSlider::kPercentage);

	SetFlag(kAudioEffect);
	SetEffectInput(kSamplesInput);
}

QString PanNode::Name() const
{
	return tr("Pan");
}

QString PanNode::id() const
{
	return QStringLiteral("org.olivevideoeditor.Olive.pan");
}

QVector<Node::CategoryID> PanNode::Category() const
{
	return { kCategoryFilter };
}

QString PanNode::Description() const
{
	return tr("Adjust the stereo panning of an audio source.");
}

void PanNode::Value(const NodeValueRow &value, const NodeGlobals &globals,
					NodeValueTable *table) const
{
	// Create a sample job
	SampleBuffer samples = value[kSamplesInput].toSamples();
	if (samples.is_allocated()) {
		// This node is only compatible with stereo audio
		if (samples.audio_params().channel_count() == 2) {
			// If the input is static, we can just do it now which will be faster
			if (IsInputStatic(kPanningInput)) {
				float pan_volume = value[kPanningInput].toDouble();
				if (!qIsNull(pan_volume)) {
					if (pan_volume > 0) {
						samples.transform_volume_for_channel(0,
															 1.0f - pan_volume);
					} else {
						samples.transform_volume_for_channel(1,
															 1.0f + pan_volume);
					}
				}

				table->Push(NodeValue(NodeValue::kSamples, samples, this));
			} else {
				// Requires job
				SampleJob job(globals.time(), kSamplesInput, value);
				job.Insert(kPanningInput, value);
				table->Push(NodeValue::kSamples, QVariant::fromValue(job),
							this);
			}
		} else {
			// Pass right through
			table->Push(value[kSamplesInput]);
		}
	}
}

void PanNode::ProcessSamples(const NodeValueRow &values,
							 const SampleBuffer &input, SampleBuffer &output,
							 int index) const
{
	float pan_val = values[kPanningInput].toDouble();

	for (int i = 0; i < input.audio_params().channel_count(); i++) {
		output.data(i)[index] = input.data(i)[index];
	}

	if (pan_val > 0) {
		output.data(0)[index] *= (1.0F - pan_val);
	} else if (pan_val < 0) {
		output.data(1)[index] *= (1.0F - qAbs(pan_val));
	}
}

void PanNode::Retranslate()
{
	super::Retranslate();

	SetInputName(kSamplesInput, tr("Samples"));
	SetInputName(kPanningInput, tr("Pan"));
}

}