/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2022 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/>.

***/

#ifndef AUDIOPROCESSOR_H
#define AUDIOPROCESSOR_H

#include <inttypes.h>
#include <olive/core/core.h>
#include <QByteArray>

extern "C" {
#include <libavfilter/avfilter.h>
}

#include "common/define.h"

namespace olive
{

using namespace core;

class AudioProcessor {
public:
	AudioProcessor();

	~AudioProcessor();

	DISABLE_COPY_MOVE(AudioProcessor)

	bool Open(const AudioParams &from, const AudioParams &to,
			  double tempo = 1.0);

	void Close();

	bool IsOpen() const
	{
		return filter_graph_;
	}

	using Buffer = QVector<QByteArray>;
	int Convert(float **in, int nb_in_samples, AudioProcessor::Buffer *output);

	void Flush();

	const AudioParams &from() const
	{
		return from_;
	}
	const AudioParams &to() const
	{
		return to_;
	}

private:
	static AVFilterContext *CreateTempoFilter(AVFilterGraph *graph,
											  AVFilterContext *link,
											  const double &tempo);

	AVFilterGraph *filter_graph_;

	AVFilterContext *buffersrc_ctx_;

	AVFilterContext *buffersink_ctx_;

	AudioParams from_;
	AVSampleFormat from_fmt_;

	AudioParams to_;
	AVSampleFormat to_fmt_;

	AVFrame *in_frame_;

	AVFrame *out_frame_;
};

}

#endif // AUDIOPROCESSOR_H