/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2019 Olive Team

  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"

OLIVE_NAMESPACE_ENTER

PanNode::PanNode()
{
  samples_input_ = new NodeInput("samples_in", NodeParam::kSamples);
  AddInput(samples_input_);

  panning_input_ = new NodeInput("panning_in", NodeParam::kFloat);
  panning_input_->set_property("min", -1.0);
  panning_input_->set_property("max", 1.0);
  panning_input_->set_property("view", "percent");
  AddInput(panning_input_);
}

Node *PanNode::copy() const
{
  return new PanNode();
}

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

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

QString PanNode::Category() const
{
  return tr("Audio");
}

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

Node::Capabilities PanNode::GetCapabilities(const NodeValueDatabase &) const
{
  return kSampleProcessor;
}

NodeInput *PanNode::ProcessesSamplesFrom(const NodeValueDatabase &value) const
{
  return samples_input_;
}

void PanNode::ProcessSamples(const NodeValueDatabase &values, const AudioRenderingParams &params, const SampleBufferPtr input, SampleBufferPtr output, int index) const
{
  if (params.channel_count() != 2) {
    // This node currently only works for stereo audio
    return;
  }

  float pan_val = values[panning_input_].Get(NodeParam::kFloat).toFloat();

  for (int i=0;i<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()
{
  samples_input_->set_name(tr("Samples"));
  panning_input_->set_name(tr("Pan"));
}

OLIVE_NAMESPACE_EXIT