保存触发id之后的视频作为触发视频

zhangmeng

2020-07-24 f93ee1a42e8c47e472332287b7350b66a6b0fa11

 csrc/ffmpeg/format/FormatOut.cpp

@@ -31,6 +31,8 @@
    ,record_(false)
    ,fps_(0.0f)
    ,format_name_("mp4")
    ,in_v_stream_(NULL)
    ,in_a_stream_(NULL)
   {}

   FormatOut::~FormatOut()
@@ -275,61 +277,63 @@
        return true;
    }

    bool FormatOut::copyCodecFromIn(std::vector<AVStream*> in){

        for (int i = 0; i < in.size(); i++){

            AVStream *in_stream = in[i];
            
            AVStream *out_stream = avformat_new_stream(ctx_, in_stream->codec->codec);
            if(!out_stream)
            {
                logIt("Failed allocating output stream.\n");
                return false;
            }

            //将输出流的编码信息复制到输入流
            auto ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
            if(ret<0)
            {
                logIt("Failed to copy context from input to output stream codec context\n");
                return false;
            }

            if (in_stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO){
                v_idx_ = i;
                logIt("copy video from instream");

                out_stream->codecpar->codec_tag = out_stream->codec->codec_tag = 0;
            
                if(ctx_->oformat->flags & AVFMT_GLOBALHEADER)
                    out_stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
            }
            if (in_stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO){
                logIt("copy audio from instream");
                a_idx_ = i;
                
                out_stream->codecpar->codec_tag = out_stream->codec->codec_tag = 0;
            
                if(ctx_->oformat->flags & AVFMT_GLOBALHEADER)
                    out_stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

            }
    bool FormatOut::addStream(AVStream *s){
        AVStream *in_stream = s;
        
        AVStream *out_stream = avformat_new_stream(ctx_, in_stream->codec->codec);
        if(!out_stream)
        {
            logIt("Failed allocating output stream.\n");
            return false;
        }

        in_streams_ = in;

        //将输出流的编码信息复制到输入流
        auto ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar);
        if(ret<0)
        {
            logIt("Failed to copy context from input to output stream codec context\n");
            return false;
        }
        out_stream->codecpar->codec_tag = 0;
        
        if(ctx_->oformat->flags & AVFMT_GLOBALHEADER)
            out_stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
        
        return true;
    }

    bool FormatOut::JustWriter(std::vector<AVStream*> in, const char *filename){
    bool FormatOut::copyCodecFromIn(AVStream *v, AVStream *a){
        if (v){
            v_idx_ = 0;
            in_v_stream_ = v;

            if (!addStream(v)){
                logIt("format out add video stream error");
                return false;
            }else{
                logIt("copy video from instream");
            }
        }
        if (a){
            a_idx_ = 1;
            in_a_stream_ = a;
            if (!addStream(a)){
                logIt("format out add audio stream error");
                return false;
            }else{
                logIt("copy audio from instream");
            }
        }
        return true;
    }

    bool FormatOut::JustWriter(AVStream *v, AVStream *a, const char *filename){
        if(ctx_){
            clear();
        }

        bool flag = open(NULL, format_name_.c_str());

        flag = copyCodecFromIn(in) && flag;
        flag = copyCodecFromIn(v, a) && flag;
        if(!flag){
            logIt("FormatOut JustWriter error from in");
            return false;
@@ -391,34 +395,11 @@
    }

    void FormatOut::adjustPTS(AVPacket *pkt, const int64_t &frame_cnt){
        if (pkt->stream_index >= ctx_->nb_streams){
            logIt("adjustPTS pkt stream index too much");
            return;
        }
        
        if (pkt->pts == AV_NOPTS_VALUE && pkt->pts == AV_NOPTS_VALUE){
            int64_t time_stamp = frame_cnt;
        
            pkt->pos = -1;  
            pkt->stream_index = 0;
            //Write PTS
            AVRational time_base = getStream()->time_base;

            AVRational time_base_q = { 1, AV_TIME_BASE };
            //Duration between 2 frames (us)
            // int64_t calc_duration = (double)(AV_TIME_BASE)*(1 / fps_);  //内部时间戳
            int64_t calc_duration = (int64_t)(AV_TIME_BASE / fps_);  //内部时间戳
            //Parameters
            pkt->pts = av_rescale_q(time_stamp*calc_duration, time_base_q, time_base);
            pkt->dts = pkt->pts;
            pkt->duration = av_rescale_q(calc_duration, time_base_q, time_base); 
            return;
        }

        AVStream *in_stream,*out_stream;
        int out_idx = -1;
        for (auto i : in_streams_){
            if (i->index == pkt->stream_index){
        std::vector<AVStream*> in_streams{in_v_stream_, in_a_stream_};
        for (auto i : in_streams){
            if (i && (i->index == pkt->stream_index)){
                if (i->codecpar->codec_type == AVMEDIA_TYPE_VIDEO){
                    out_idx = v_idx_;
                    in_stream = i;
@@ -431,24 +412,34 @@
            }
        }
        if (out_idx == -1) return;

        out_stream = ctx_->streams[out_idx];
        pkt->stream_index = out_idx;

        int64_t time_stamp = frame_cnt;

        if (out_idx == v_idx_){
        
            pkt->pos = -1;  
            AVRational time_base = ctx_->streams[out_idx]->time_base;

            AVRational time_base_q = { 1, AV_TIME_BASE };
            int64_t calc_duration = (int64_t)(AV_TIME_BASE / fps_);  //内部时间戳
            pkt->pts = av_rescale_q(time_stamp*calc_duration, time_base_q, time_base);
            pkt->dts = pkt->pts;
            pkt->duration = av_rescale_q(calc_duration, time_base_q, time_base); 
            
        }else if (out_idx == a_idx_){

            pkt->duration = 1024;
            pkt->pts = pkt->dts = pkt->duration * time_stamp; 

        }
        // logIt("BEFORE in stream timebase %d:%d, out timebase %d:%d, 
        //         pts: %lld, dts: %lld, duration: %lld", 
        //     in_stream->time_base.num, in_stream->time_base.den,
        //     out_stream->time_base.num, out_stream->time_base.den,
        //     pkt->pts, pkt->dts, pkt->duration);

        //转换 PTS/DTS 时序
        pkt->pts = av_rescale_q_rnd(pkt->pts,in_stream->time_base,out_stream->time_base,(enum AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
        pkt->dts = av_rescale_q_rnd(pkt->dts, in_stream->time_base, out_stream->time_base, (enum AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));  
        pkt->duration = av_rescale_q(pkt->duration, in_stream->time_base, out_stream->time_base); 
        pkt->pos = -1;  

        // logIt("AFTER stream %d, pts: %lld, dts: %lld, duration: %lld", 
        // pkt->stream_index, pkt->pts, pkt->dts, pkt->duration);
    }

    bool FormatOut::writeFrame(AVPacket *pkt, const int64_t &frame_cnt,