ZLMediaKit/src/Player/Track.h

//
// Created by xzl on 2018/10/21.
//

#ifndef ZLMEDIAKIT_TRACK_H
#define ZLMEDIAKIT_TRACK_H

#include <memory>
#include <string>
#include "Frame.h"
#include "Util/RingBuffer.h"
#include "Rtsp/Rtsp.h"
#include "Player.h"
using namespace toolkit;

namespace mediakit{

class Track : public FrameRing , public CodecInfo{
public:
    typedef std::shared_ptr<Track> Ptr;
    Track(){}
    virtual ~Track(){}
};

class VideoTrack : public Track {
public:
    typedef std::shared_ptr<VideoTrack> Ptr;

    TrackType getTrackType() const override { return TrackVideo;};

    /**
     * 返回视频高度
     * @return
     */
    virtual int getVideoHeight() const = 0;

    /**
     * 返回视频宽度
     * @return
     */
    virtual int getVideoWidth() const  = 0;

    /**
     * 返回视频fps
     * @return
     */
    virtual float getVideoFps() const = 0;
};

class AudioTrack : public Track {
public:
    typedef std::shared_ptr<AudioTrack> Ptr;

    TrackType getTrackType() const override { return TrackAudio;};

    /**
     * 返回音频采样率
     * @return
     */
    virtual int getAudioSampleRate() const  = 0;

    /**
     * 返回音频采样位数，一般为16或8
     * @return
     */
    virtual int getAudioSampleBit() const = 0;

    /**
     * 返回音频通道数
     * @return
     */
    virtual int getAudioChannel() const = 0;
};

class H264Track : public VideoTrack{
public:
    typedef std::shared_ptr<H264Track> Ptr;

    /**
     * 不指定sps pps构造h264类型的媒体
     * 在随后的inputFrame中获取sps pps
     */
    H264Track(){}
    /**
     * 构造h264类型的媒体
     * @param sps sps帧数据
     * @param pps pps帧数据
     * @param sps_prefix_len 264头长度，可以为3个或4个字节，一般为0x00 00 00 01
     * @param pps_prefix_len 264头长度，可以为3个或4个字节，一般为0x00 00 00 01
     */
    H264Track(const string &sps,const string &pps,int sps_prefix_len = 4,int pps_prefix_len = 4){
        _sps = sps.substr(sps_prefix_len);
        _pps = pps.substr(pps_prefix_len);
        parseSps(_sps);
    }

    /**
     * 构造h264类型的媒体
     * @param sps sps帧
     * @param pps pps帧
     */
    H264Track(const Frame::Ptr &sps,const Frame::Ptr &pps){
        if(sps->getCodecId() != CodecH264 || pps->getCodecId() != CodecH264 ){
            throw std::invalid_argument("必须输入H264类型的帧");
        }
        _sps = string(sps->data() + sps->prefixSize(),sps->size() - sps->prefixSize());
        _pps = string(pps->data() + pps->prefixSize(),pps->size() - pps->prefixSize());
        parseSps(_sps);
    }

    /**
     * 返回不带0x00 00 00 01头的sps
     * @return
     */
    const string &getSps() const{
        return _sps;
    }

    /**
     * 返回不带0x00 00 00 01头的pps
     * @return
     */
    const string &getPps() const{
        return _pps;
    }

    CodecId getCodecId() const override {
        return CodecH264;
    }

    /**
     * 返回视频高度
     * @return
     */
    int getVideoHeight() const override{
        return _width;
    }

    /**
     * 返回视频宽度
     * @return
     */
    int getVideoWidth() const override{
        return _height;
    }

    /**
     * 返回视频fps
     * @return
     */
    float getVideoFps() const override{
        return _fps;
    }

    TrackType getTrackType() const override {
        if(_sps.empty() || _pps.empty()){
            return TrackInvalid;
        }
        return TrackVideo;
    }


    /**
     * 输入数据帧,并获取sps pps
     * @param frame 数据帧
     */
    void inputFrame(const Frame::Ptr &frame) override{
        int type = (*((uint8_t *)frame->data() + frame->prefixSize())) & 0x1F;
        switch (type){
            case 7:{
                //sps
                bool flag = _sps.empty();
                _sps = string(frame->data() + frame->prefixSize(),frame->size() - frame->prefixSize());
                if(flag && _width == 0){
                    parseSps(_sps);
                }
            }
                break;
            case 8:{
                //pps
                _pps = string(frame->data() + frame->prefixSize(),frame->size() - frame->prefixSize());
            }
                break;

            case 5:{
                //I
                if(!_sps.empty()){
                    H264Frame::Ptr insertFrame = std::make_shared<H264Frame>();
                    insertFrame->timeStamp = frame->stamp();
                    insertFrame->type = 7;
                    insertFrame->buffer = _sps;
                    insertFrame->iPrefixSize = 0;
                    VideoTrack::inputFrame(insertFrame);
                }

                if(!_pps.empty()){
                    H264Frame::Ptr insertFrame = std::make_shared<H264Frame>();
                    insertFrame->timeStamp = frame->stamp();
                    insertFrame->type = 8;
                    insertFrame->buffer = _pps;
                    insertFrame->iPrefixSize = 0;
                    VideoTrack::inputFrame(insertFrame);
                }
                VideoTrack::inputFrame(frame);
            }
                break;

            case 1:{
                //B or P
                VideoTrack::inputFrame(frame);
            }
                break;
        }
    }
private:
    /**
     * 解析sps获取宽高fps
     * @param sps sps不含头数据
     */
    void parseSps(const string &sps){
        getAVCInfo(sps,_width,_height,_fps);
    }
private:
    string _sps;
    string _pps;
    int _width = 0;
    int _height = 0;
    float _fps = 0;
};

class AACTrack : public AudioTrack{
public:
    typedef std::shared_ptr<AACTrack> Ptr;

    /**
     * 延后获取adts头信息
     * 在随后的inputFrame中获取adts头信息
     */
    AACTrack(){}

    /**
     * 构造aac类型的媒体
     * @param aac_cfg aac两个字节的配置信息
     */
    AACTrack(const string &aac_cfg){
        if(aac_cfg.size() != 2){
            throw std::invalid_argument("adts配置必须为2个字节");
        }
        _cfg = aac_cfg;
        parseAacCfg(_cfg);
    }

    /**
     * 构造aac类型的媒体
     * @param adts_header adts头，7个字节
     * @param adts_header_len adts头长度，不少于7个字节
     */
    AACTrack(const char *adts_header,int adts_header_len = 7){
        if(adts_header_len < 7){
            throw std::invalid_argument("adts头必须不少于7个字节");
        }
        _cfg = makeAdtsConfig((uint8_t*)adts_header);
        parseAacCfg(_cfg);
    }

    /**
     * 构造aac类型的媒体
     * @param aac_frame_with_adts 带adts头的aac帧
     */
    AACTrack(const Frame::Ptr &aac_frame_with_adts){
        if(aac_frame_with_adts->getCodecId() != CodecAAC || aac_frame_with_adts->prefixSize() < 7){
            throw std::invalid_argument("必须输入带adts头的aac帧");
        }
        _cfg = makeAdtsConfig((uint8_t*)aac_frame_with_adts->data());
        parseAacCfg(_cfg);
    }

    /**
     * 获取aac两个字节的配置
     * @return
     */
    const string &getAacCfg() const{
        return _cfg;
    }

    /**
     * 返回编码类型
     * @return
     */
    CodecId getCodecId() const override{
        return CodecAAC;
    }

    /**
     * 在获取aac_cfg前是无效的Track
     * @return
     */
    TrackType getTrackType() const override {
        if(_cfg.empty()){
            return TrackInvalid;
        }
        return TrackAudio;
    }
    /**
    * 返回音频采样率
    * @return
    */
    int getAudioSampleRate() const override{
        return _sampleRate;
    }
    /**
     * 返回音频采样位数，一般为16或8
     * @return
     */
    int getAudioSampleBit() const override{
        return _sampleBit;
    }
    /**
     * 返回音频通道数
     * @return
     */
    int getAudioChannel() const override{
        return _channel;
    }

    /**
    * 输入数据帧,并获取aac_cfg
    * @param frame 数据帧
    */
    void inputFrame(const Frame::Ptr &frame) override{
        if(_cfg.empty() && frame->prefixSize() == 7){
            //7个字节的adts头
            _cfg = makeAdtsConfig(reinterpret_cast<const uint8_t *>(frame->data()));
            parseAacCfg(_cfg);
        }
        AudioTrack::inputFrame(frame);
    }
private:
    /**
     * 解析2个字节的aac配置
     * @param aac_cfg
     */
    void parseAacCfg(const string &aac_cfg){
        AACFrame aacFrame;
        makeAdtsHeader(aac_cfg,aacFrame);
        getAACInfo(aacFrame,_sampleRate,_channel);
    }
private:
    string _cfg;
    int _sampleRate = 0;
    int _sampleBit = 16;
    int _channel = 0;
};

}//namespace mediakit

#endif //ZLMEDIAKIT_TRACK_H