/************************************************************
*Copyright (C), 2017-2027,lcb0281@gmail.com
*FileName: videoplayer.h
*Date:     2019-06-15
*Author:   Caibiao Lee
*Version:  V1.0
*Description: 音视频读取解码显示播放模块
*Others: 该模块代码由网上拷贝，我只是添加了
	注释，规范了一些编码规范
*History:  
***********************************************************/
#ifndef VIDEOPLAYER_H
#define VIDEOPLAYER_H
#include <QThread>
#include <QImage>

extern "C"
{
    #include "libavcodec/avcodec.h"
    #include "libavformat/avformat.h"
    #include <libavutil/time.h>
    #include "libavutil/pixfmt.h"
    #include "libswscale/swscale.h"
    #include "libswresample/swresample.h"

    #include <SDL.h>
    #include <SDL_audio.h>
    #include <SDL_types.h>
    #include <SDL_name.h>
    #include <SDL_main.h>
    #include <SDL_config.h>
}

#define VIDEO_PICTURE_QUEUE_SIZE 1
#define MAX_AUDIO_SIZE (25 * 16 * 1024)
#define MAX_VIDEO_SIZE (25 * 256 * 1024)
#define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 /**1 second of 48khz 32bit audio**/ 

class VideoPlayer; /**前置声明**/

typedef struct PacketQueue 
{
    AVPacketList *first_pkt; /**队列头指针**/
	AVPacketList *last_pkt;  /**队列尾指针**/
    int nb_packets;	  /**队列长度**/	
    int size;		  /**该节点数据大小**/
    SDL_mutex *mutex; /**互斥量**/
    SDL_cond *cond;   /**状态变量**/
} PacketQueue;

typedef struct VideoState 
{
    DECLARE_ALIGNED(16,uint8_t,audio_buf2) [AVCODEC_MAX_AUDIO_FRAME_SIZE * 4];//字节对齐，提升效率
    AVFormatContext *pFormatContext; /**文件格式上下文**/
    PacketQueue audioq;//音频队列
    AVFrame *audio_frame;/**解码音频过程中的使用缓存**/
    AVStream *audio_st; /**音频流**/
    AVStream *video_st;//视频流
    AVPacket audio_pkt;
    PacketQueue videoq;//视频队列

    struct SwrContext *swr_ctx; /**用于解码后的音频格式转换**/

    uint8_t *audio_buf;
    uint8_t *audio_pkt_data;

    int audio_pkt_size;
    int s32VStreamCount; /**视频流数量**/
    int s32AStreamCount; /**音频流数量**/

    int audio_src_channels;
    int audio_tgt_channels;
    int audio_src_freq;
    int audio_tgt_freq;
    int audio_hw_buf_size;

    unsigned int audio_buf_size;
    unsigned int audio_buf_index;

    int64_t audio_src_channel_layout;
    int64_t audio_tgt_channel_layout;

    enum AVSampleFormat audio_src_fmt;
    enum AVSampleFormat audio_tgt_fmt;

    double audio_clock; /**音频时钟**/
    double video_clock; /**<pts of last decoded frame / predicted pts of next decoded frame**/

    /**跳转相关的变量**/ 
    int             seek_req; /**跳转标志**/
    int64_t         seek_pos; /**跳转的位置 -- 微秒**/
    int             seek_flag_audio;/**跳转标志 -- 用于音频线程中**/
    int             seek_flag_video;/**跳转标志 -- 用于视频线程中**/
    double          seek_time;      /**跳转的时间(秒)  值和seek_pos是一样的**/

    /**播放控制相关**/
    bool isPause;       /**暂停标志**/
    bool quit;          /**停止**/
    bool readFinished;  /**文件读取完毕**/
    bool readThreadFinished;
    bool videoThreadFinished;

    SDL_Thread *video_tid;       /**视频线程id**/
    SDL_AudioDeviceID audioID;   /**SDL Audio Device IDs.**/
    VideoPlayer *player;         /**记录下这个类的指针  主要用于在线程里面调用激发信号的函数**/

}VideoState;

class VideoPlayer : public QThread
{
    Q_OBJECT

public:

    enum PlayerState
    {
        Playing,
        Pause,
        Stop
    };

    explicit VideoPlayer();
    ~VideoPlayer();

    bool setFileName(QString path);

    bool play();
    bool pause();
    bool stop(bool isWait = false); //参数表示是否等待所有的线程执行完毕再返回
    void seek(int64_t pos); //单位是微秒

    int64_t getTotalTime(); //单位微秒
    double getCurrentTime(); //单位秒
    void disPlayVideo(QImage img);
    void disPlayVideo(uchar *ptr,uint width,uint height);
    int SaveYuv(unsigned char *buf, int wrap, int xsize, int ysize, char *filename);
signals:
    void sig_GetOneFrame(QImage); //获取到一帧图像 就发送此信号
    void sigYuv_liuyi(uchar *ptr,uint width,uint height); //获取到一帧图像 就发送此信号
    void sig_StateChanged(VideoPlayer::PlayerState state);
    void sig_TotalTimeChanged(qint64 uSec); //获取到视频时长的时候激发此信号

protected:
    void run();

private:
    QString mFileName;
    VideoState mVideoState;
    PlayerState mPlayerState; //播放状态

};

#endif // VIDEOPLAYER_H