/*
 * Olive Community Edition - Non-Linear Video Editor
 * Copyright (C) 2025 Olive CE 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 FFMPEGENCODER_H
#define FFMPEGENCODER_H

extern "C" {
#include <libavcodec/avcodec.h>
#include <libavfilter/avfilter.h>
#include <libavformat/avformat.h>
#include <libswresample/swresample.h>
#include <libavutil/opt.h>
}

#include "codec/encoder.h"

namespace olive
{

class FFmpegEncoder : public Encoder {
	Q_OBJECT
public:
	FFmpegEncoder(const EncodingParams &params);

	virtual QStringList
	GetPixelFormatsForCodec(ExportCodec::Codec c) const override;

	virtual std::vector<SampleFormat>
	GetSampleFormatsForCodec(ExportCodec::Codec c) const override;

	virtual bool Open() override;

	virtual bool WriteFrame(olive::FramePtr frame,
							olive::core::rational time) override;

	virtual bool WriteAudio(const olive::SampleBuffer &audio) override;

	bool WriteAudioData(const AudioParams &audio_params, const uint8_t **data,
						int input_sample_count);

	virtual bool WriteSubtitle(const SubtitleBlock *sub_block) override;

	virtual void Close() override;

	virtual PixelFormat GetDesiredPixelFormat() const override
	{
		return video_conversion_fmt_;
	}

private:
	/**
   * @brief Handle an FFmpeg error code
   *
   * Uses the FFmpeg API to retrieve a descriptive string for this error code and sends it to Error(). As such, this
   * function also automatically closes the Decoder.
   *
   * @param error_code
   */
	void FFmpegError(const QString &context, int error_code);

	bool WriteAVFrame(AVFrame *frame, AVCodecContext *codec_ctx,
					  AVStream *stream);

	bool InitializeStream(enum AVMediaType type, AVStream **stream,
						  AVCodecContext **codec_ctx,
						  const ExportCodec::Codec &codec);
	bool InitializeCodecContext(AVStream **stream, AVCodecContext **codec_ctx,
								const AVCodec *codec);
	bool SetupCodecContext(AVStream *stream, AVCodecContext *codec_ctx,
						   const AVCodec *codec);

	void FlushEncoders();
	void FlushCodecCtx(AVCodecContext *codec_ctx, AVStream *stream);

	bool InitializeResampleContext(const AudioParams &audio);

	static const AVCodec *GetEncoder(ExportCodec::Codec c,
									 SampleFormat aformat);

	AVFormatContext *fmt_ctx_;

	AVStream *video_stream_;
	AVCodecContext *video_codec_ctx_;
	AVFilterGraph *video_scale_ctx_;
	AVFilterContext *video_buffersrc_ctx_;
	AVFilterContext *video_buffersink_ctx_;
	PixelFormat video_conversion_fmt_;

	AVStream *audio_stream_;
	AVCodecContext *audio_codec_ctx_;
	SwrContext *audio_resample_ctx_;
	AVFrame *audio_frame_;
	int audio_max_samples_;
	int audio_frame_offset_;
	int audio_write_count_;

	AVStream *subtitle_stream_;
	AVCodecContext *subtitle_codec_ctx_;

	bool open_;
};

}

#endif // FFMPEGENCODER_H