/*
 * Copyright (c) 2023 Fancy Code.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef FFMPEG_ENCODER_H
#define FFMPEG_ENCODER_H
#ifdef __cplusplus
extern "C" {
#endif
#include <libavcodec/avcodec.h>
#include <libavcodec/packet.h>
#include <libavformat/avformat.h>
#include <libavutil/avassert.h>
#include <libavutil/avutil.h>
#include <libavutil/channel_layout.h>
#include <libavutil/imgutils.h>
#include <libavutil/mathematics.h>
#include <libavutil/opt.h>
#include <libavutil/timestamp.h>
#include <libswresample/swresample.h>
#include <libswscale/swscale.h>
#ifdef __cplusplus
}
#endif
#include <functional>
class FfmpegEncoder
{
public:
    FfmpegEncoder(const enum AVCodecID &codecId);
    virtual ~FfmpegEncoder() = default;
    bool Init(int &outputFlags);
    void UnInit(void);
    AVRational GetTimeBase(void);
    bool OpenEncoder(AVDictionary *optArg, AVStream *stream);
    int EncodeData(AVFrame *frame, AVStream *stream, std::function<void(AVPacket *pkt)> callback);

private:
    bool OpenVideo(AVDictionary *optArg, AVStream *stream);
    bool OpenAudio(AVDictionary *optArg, AVStream *stream);
    AVFrame *ConvertAudioFrame(AVFrame *decodeFrame, struct SwrContext *swr_ctx);

private:
    static AVFrame *alloc_frame(enum AVPixelFormat pix_fmt, int width, int height);
    static AVFrame *alloc_audio_frame(enum AVSampleFormat sample_fmt, const AVChannelLayout *channel_layout,
                                      int sample_rate, int nb_samples);

private:
    const enum AVCodecID mCodecId;
    AVCodecContext *mCodecCtx;
    AVCodec *mCodec;
    AVFrame *mFrame;
    AVFrame *mTmpFrame;
    AVPacket *mTmpPkt;
    int mSamplesCount;
    struct SwrContext *mSwrCtx;
    int64_t next_pts;
};
#endif