[ffmpeg][vaapi][goav][golang] ffmpeg使用vaapi示例代码(基于goav-incr)

短命女 2023-05-31 07:15 4阅读 0赞

## \[ffmpeg\]\[vaapi\]\[goav\]\[golang\] ffmpeg使用vaapi示例(基于goav-incr) ##

自己写的一份比较完备的vaapi硬件加速示例代码，包含了vaapi的解码，编码，及滤波的使用。  
基于goav,介于goav还有点bug,几个内存释放的函数会crash, 有可能版本不一致吧,作者貌似也不维护了,就没给作者提,其次我还需要加点硬件加速代码,就弄了个goav-incr,只要还在做直播期间会一直维护吧。

也有qsv的,但是qsv编程实在麻烦,目前没整理了,整个框架会穿插一个硬件帧上下文,做起filter的切换会特别费事。

// 示例代码vaapi 解码编码  
// vaapi解码cpu/overlay编码

package main
    
    import(
    	"github.com/ailumiyana/goav-incr/goav/avcodec"
    	"github.com/ailumiyana/goav-incr/goav/avutil"
    	"github.com/ailumiyana/goav-incr/goav/avfilter"
    
    	"ffmpeg-server/latency"
    	log "github.com/astaxie/beego/logs"
    
    	"fmt"
    	//"time"
    	"io/ioutil"
    	"os"
    	"strconv"
    	"unsafe"
    )
    
    
    var input_h264  string = "1080p.h264"
    var output_h264 string = "out.h264"
    
    type VaapiHWDeviceCtx struct {
        
    	hw_device_ctx *avutil.BufferRef
    }
    
    // input : "/dev/dri/card0" or "/dev/dri/renderD128"
    func Create(device string) *VaapiHWDeviceCtx {
        
    	var hw_device_ctx *avutil.BufferRef
    	err := avutil.AVHwdeviceCtxCreate(&hw_device_ctx, avutil.AV_HWDEVICE_TYPE_VAAPI,
    		device, nil, 0)
    	if err < 0 {
        
    		fmt.Println("AVHwdeviceCtxCreate err : ", avutil.ErrorFromCode(err))
    		return nil
    	}
    
    	return &VaapiHWDeviceCtx{
        
    		hw_device_ctx,
    	}
    }
    
    func (v *VaapiHWDeviceCtx)Context() *avutil.BufferRef{
        
    	return v.hw_device_ctx
    }
    
    //warning need unref by avutil.AVBufferUnref()
    func (v *VaapiHWDeviceCtx)GetAnAllocHwframeCtxRef(format, sw_format avutil.PixelFormat, w, h int) *avutil.BufferRef{
        
    	hw_frames_ref := avutil.AVHwframeCtxAlloc(v.hw_device_ctx)
    	if hw_frames_ref == nil {
        
    		fmt.Println("AVHwframeCtxAlloc err")
    		return nil
    	}
    
    	frames_ctx := hw_frames_ref.HWFramesContext()
    	//frames_ctx.SetHWFramesContextPrarms(avutil.PixelFormat(avcodec.AV_PIX_FMT_VAAPI),
    	//		avutil.PixelFormat(avcodec.AV_PIX_FMT_YUV420P),	
    	//		1280, 720)
    	frames_ctx.SetHWFramesContextPrarms(format, sw_format, w, h)
    
    	err := avutil.AVHwFrameCtxInit(hw_frames_ref)
    	if err < 0 {
        
    		fmt.Println("AVHwFrameCtxInit err : ", avutil.ErrorFromCode(err))
    		avutil.AVBufferUnref(&hw_frames_ref)
    		return nil
    	}
    
    	return hw_frames_ref
    }
    
    //var hw_device_ctx *avutil.BufferRef// = avutil.AVHwdeviceCtxAlloc(avutil.AV_HWDEVICE_TYPE_VAAPI)
    
    func SetHwframesContext(ctxt *avcodec.Context) {
        
    	/*var hw_device_ctx *avutil.BufferRef
    
    	err := avutil.AVHwdeviceCtxCreate(&hw_device_ctx, avutil.AV_HWDEVICE_TYPE_VAAPI,
    		"/dev/dri/card0", nil, 0)
    	if err < 0 {
    		fmt.Println("AVHwdeviceCtxCreate err : ", avutil.ErrorFromCode(err))
    		panic("AVHwdeviceCtxCreate faild")
    	}*/
    
    	vaapi_device  := Create("/dev/dri/card0")
    	//hw_device_ctx := vaapi_device.Context()
    
    	/*hw_frames_ref := avutil.AVHwframeCtxAlloc(hw_device_ctx)
    	if hw_frames_ref == nil {
    		fmt.Println("AVHwframeCtxAlloc err")
    		panic("AVHwframeCtxAlloc faild")
    	}
    
    	frames_ctx := hw_frames_ref.HWFramesContext()
    	frames_ctx.SetHWFramesContextPrarms(avutil.PixelFormat(avcodec.AV_PIX_FMT_VAAPI),
    			avutil.PixelFormat(avcodec.AV_PIX_FMT_YUV420P),	
    			1280, 720)
    
    	err := avutil.AVHwFrameCtxInit(hw_frames_ref)
    	if err < 0 {
    		fmt.Println("AVHwFrameCtxInit err : ", avutil.ErrorFromCode(err))
    		avutil.AVBufferUnref(&hw_frames_ref)
    		panic("AVHwFrameCtxInit faild")
    	}*/
    
    	hw_frames_ref := vaapi_device.GetAnAllocHwframeCtxRef(
    							avutil.PixelFormat(avcodec.AV_PIX_FMT_VAAPI),
    							avutil.PixelFormat(avcodec.AV_PIX_FMT_YUV420P),	1280, 720)
    
    	//enc.Context().HWFramesCtx() = avutil.AVBufferRef(hw_frames_ref)
    	ctxt.SetHWFramesCtx(avutil.AVBufferRef(hw_frames_ref))
    	if ctxt.HWFramesCtx() == nil {
        
    		fmt.Println("SetHWFrameCtx err ")
    		avutil.AVBufferUnref(&hw_frames_ref)
    		panic("SetHWFrameCtx faild")
    	}
    
    	//fmt.Println(frames_ctx)
    	//fmt.Println(hw_frames_ref)
    	//fmt.Println(ctxt.HWFramesCtx())
    
    	avutil.AVBufferUnref(&hw_frames_ref)
    }
    
    
    func decode_encode() {
        
    	//decoder
    	vaapi_device  := Create("/dev/dri/renderD128")
    
    	pkt 		   := avcodec.AvPacketAlloc()
    	if pkt == nil {
        
    		log.Critical("AvPacketAlloc failed.")
    		return 
    	}
    
    	codec 		   := avcodec.AvcodecFindDecoder(avcodec.CodecId(avcodec.AV_CODEC_ID_H264))
    	if codec == nil {
        
    		log.Critical("AvcodecFindDecoder failed.")
    	}
    
    	context 	   := codec.AvcodecAllocContext3()
    	if context == nil {
        
    		log.Critical("AvcodecAllocContext3 failed.")
    		return 
    	}
    
    	parserContext  := avcodec.AvParserInit(int(avcodec.CodecId(avcodec.AV_CODEC_ID_H264)))
    	if parserContext == nil {
        
    		log.Critical("AvParserInit failed.")
    		return 
    	}
    
    	frame   	   := avutil.AvFrameAlloc()
    	if frame == nil {
        
    		log.Critical("AvFrameAlloc failed.")
    		return 
    	}
    
    	context.SetHWDeviceCtx(avutil.AVBufferRef(vaapi_device.Context()))
    	err := context.AvcodecOpen2(codec, nil)
    	if err < 0 {
        
    		log.Critical("AvcodecOpen2 failed.")
    		return 
    	}
    
    	// encoder
    	codec_enc 		   := avcodec.AvcodecFindEncoderByName("h264_vaapi")
    	if codec_enc == nil {
        
    		log.Critical("AvcodecFindEncoderByName failed.")
    	}
    
    	pkt_enc 		   := avcodec.AvPacketAlloc()
    	if pkt_enc == nil {
        
    		log.Critical("AvPacketAlloc failed.")
    	}
    
    	context_enc 	   := codec_enc.AvcodecAllocContext3()
    	if context_enc == nil {
        
    		log.Critical("AvcodecAllocContext3 failed.")
    	}
    
    	context_enc.SetVideoEncodeParams(2000000, 1920, 1080,
    		avcodec.AV_PIX_FMT_VAAPI,
    		false, 10)
    	context_enc.SetTimebase(1, 30)
    
    	hw_frames_ref := vaapi_device.GetAnAllocHwframeCtxRef(
    							avutil.PixelFormat(avcodec.AV_PIX_FMT_VAAPI),
    							avutil.PixelFormat(avcodec.AV_PIX_FMT_NV12), 1920, 1080)
    
    
    	context_enc.SetHWFramesCtx(avutil.AVBufferRef(hw_frames_ref))
    
    	err = context_enc.AvcodecOpen2(codec_enc, nil)
    	if err < 0 {
        
    		log.Critical("AvcodecOpen2 failed.")
    		return
    	}
    
    	decLatency := latency.New("vaapi", "decode")
    	encLatency := latency.New("vaapi", "encode")
    	/*scaleLatency := latency.New("vaapi", "scale")
    	overlayLatency := latency.New("vaapi", "overlay")*/
    
    	data, erro := ioutil.ReadFile(input_h264)
        if erro != nil {
        
            log.Debug("File reading error", erro)
            return
    	}
    	log.Debug("Open Success.")
    	l := len(data)
        log.Debug("size of file:", l)
    	
    	b := make([]byte, 4096 + 64)
    	
    	file, erro := os.Create(output_h264)
    	if erro != nil {
        
    		log.Critical("Error Reading")
    	}
    	defer file.Close()
    
    	//var pts int64 = 0
    	//var opts int64 = 0
    
    	//var frames [25]*avutil.Frame
    	started := false
    	sum := 0
    	for sum < l {
        
    		remain := 4096
    		for remain > 0 {
        
    			copy(b, data[sum:sum + 4096])
    			if !started {
        
    				decLatency.Start()
    				started = true
    			}
    			n := context.AvParserParse2(parserContext, pkt, b, 
    				remain, avcodec.AV_NOPTS_VALUE, avcodec.AV_NOPTS_VALUE, 0)
    			log.Debug("parser ", n, "bytes")
    			
    			sum     = sum + n
    			remain  = remain - n;
    
    			//log.Trace("--------", dec.Packet().GetPacketSize())
    			if pkt.GetPacketSize() > 0 {
        
    				//fmt.Println(decLatency.End())
    
    				ret := context.AvcodecSendPacket(pkt)
    				if ret < 0 {
        
    					log.Error("AvcodecSendPacket err ", avutil.ErrorFromCode(ret))
    					continue 
    				}
    			
    				ret = context.AvcodecReceiveFrame((*avcodec.Frame)(unsafe.Pointer(frame)))
    				if ret < 0 {
        
    					log.Error("AvcodecReceiveFrame err ", avutil.ErrorFromCode(ret))
    					continue 
    				}
    
    				if ret == 0 {
        
    					started = false
    					decLatency.End()
    					fmt.Println(decLatency.End())
    
    					log.Debug("dec-frame:",frame)
    					
    
    					encLatency.Start()
    					ret = context_enc.AvcodecSendFrame((*avcodec.Frame)(unsafe.Pointer(frame)))
    					if ret < 0 {
        
    						log.Trace("AvcodecSendFrame err ", avutil.ErrorFromCode(ret))
    						continue
    					}
    				
    					ret = context_enc.AvcodecReceivePacket(pkt_enc)
    					if ret < 0 {
        
    						log.Trace("AvcodecReceivePacket err ", avutil.ErrorFromCode(ret))
    						continue
    					}
    					if ret == 0 {
        
    						data0 := pkt_enc.Data()
    						buf := make([]byte, pkt_enc.GetPacketSize())
    						start := uintptr(unsafe.Pointer(data0))
    						for i := 0; i < pkt_enc.GetPacketSize(); i++ {
        
    							elem := *(*uint8)(unsafe.Pointer(start + uintptr(i)))
    							buf[i] = elem
    						}
    						
    						file.Write(buf)
    						//encLatency.End()
    						fmt.Println(encLatency.End())
    					}
    
    					avutil.AvFrameUnref(frame)
    					//avutil.AvFrameUnref(oframe)
    
    				}
    
    			}
    		}
    	}	
    }
    
    func decode_overlay_encode() {
        
    	//decoder
    	vaapi_device  := Create("/dev/dri/renderD128")
    
    	pkt 		   := avcodec.AvPacketAlloc()
    	if pkt == nil {
        
    		log.Critical("AvPacketAlloc failed.")
    		return 
    	}
    
    	codec 		   := avcodec.AvcodecFindDecoder(avcodec.CodecId(avcodec.AV_CODEC_ID_H264))
    	if codec == nil {
        
    		log.Critical("AvcodecFindDecoder failed.")
    	}
    
    	context 	   := codec.AvcodecAllocContext3()
    	if context == nil {
        
    		log.Critical("AvcodecAllocContext3 failed.")
    		return 
    	}
    
    	parserContext  := avcodec.AvParserInit(int(avcodec.CodecId(avcodec.AV_CODEC_ID_H264)))
    	if parserContext == nil {
        
    		log.Critical("AvParserInit failed.")
    		return 
    	}
    
    	frame   	   := avutil.AvFrameAlloc()
    	if frame == nil {
        
    		log.Critical("AvFrameAlloc failed.")
    		return 
    	}
    
    	context.SetHWDeviceCtx(avutil.AVBufferRef(vaapi_device.Context()))
    	err := context.AvcodecOpen2(codec, nil)
    	if err < 0 {
        
    		log.Critical("AvcodecOpen2 failed.")
    		return 
    	}
    
    	// encoder
    	codec_enc 		   := avcodec.AvcodecFindEncoderByName("h264_vaapi")
    	if codec_enc == nil {
        
    		log.Critical("AvcodecFindEncoderByName failed.")
    	}
    
    	pkt_enc 		   := avcodec.AvPacketAlloc()
    	if pkt_enc == nil {
        
    		log.Critical("AvPacketAlloc failed.")
    	}
    
    	context_enc 	   := codec_enc.AvcodecAllocContext3()
    	if context_enc == nil {
        
    		log.Critical("AvcodecAllocContext3 failed.")
    	}
    
    	context_enc.SetVideoEncodeParams(2000000, 1920, 1080,
    		avcodec.AV_PIX_FMT_VAAPI,
    		false, 10)
    	context_enc.SetTimebase(1, 30)
    
    	hw_frames_ref := vaapi_device.GetAnAllocHwframeCtxRef(
    							avutil.PixelFormat(avcodec.AV_PIX_FMT_VAAPI),
    							avutil.PixelFormat(avcodec.AV_PIX_FMT_NV12), 1920, 1080)
    
    
    	/*context_enc.SetHWFramesCtx(avutil.AVBufferRef(outs[0].AvBuffersinkGetHwFramesCtx()))
    
    	err = context_enc.AvcodecOpen2(codec_enc, nil)
    	if err < 0 {
    		log.Critical("AvcodecOpen2 failed.")
    		return
    	}*/
    
    	decLatency := latency.New("vaapi", "decode")
    	encLatency := latency.New("vaapi", "encode")
    
    	// filter
    	args := "video_size=1920x1080:pix_fmt=46:time_base=1/30:pixel_aspect=1/1"
    	des  := "[in0] fps=30,scale_vaapi=w=960:h=540:format=nv12, hwdownload,format=nv12 [s0];color=black:r=30:size=1920x1080:sar=1/1 [b0];[b0][s0] overlay=x=0:y=0, format=nv12, hwupload"
    	
    	graph := avfilter.AvfilterGraphAlloc()
    	if graph == nil {
        
    		log.Critical("AvfilterGraphAlloc Failed.")
    		return
    	}
    	//graph.SetNbThreads(8)
    
    	inputs  := avfilter.AvfilterInoutAlloc()
    	outputs := avfilter.AvfilterInoutAlloc()
    	if inputs == nil || outputs == nil {
        
    		log.Critical("AvfilterInoutAlloc Failed.")
    		return
    	}
    
    	defer avfilter.AvfilterInoutFree(inputs)
    	defer avfilter.AvfilterInoutFree(outputs)
    
    	var buffersrc *avfilter.Filter
    	var buffersink *avfilter.Filter
    	if false {
        
    		buffersrc  = avfilter.AvfilterGetByName("abuffer")
    		buffersink = avfilter.AvfilterGetByName("abuffersink")
    	} else {
        
    		buffersrc  = avfilter.AvfilterGetByName("buffer")
    		buffersink = avfilter.AvfilterGetByName("buffersink")
    	}
    	
    	if buffersink == nil || buffersrc == nil {
        
    		log.Critical("AvfilterGetByName Failed.")
    		return
    	}
    
    	ret := graph.AvfilterGraphParse2(des, &inputs, &outputs)
    	if ret < 0 {
        
    		log.Critical("AvfilterInoutAlloc Failed des : ", avutil.ErrorFromCode(ret))
    		return
    	}
    
    	if vaapi_device.Context() != nil {
        
    		for _, v := range graph.Filters() {
        
    			v.SetHWDeviceCtx(avutil.AVBufferRef(vaapi_device.Context()))
    		}
    	}
    
    	var ins    []*avfilter.Context
    	var outs   []*avfilter.Context
    	var frames []*avutil.Frame
    	
    	// inputs
    	index := 0
    	
    	for cur := inputs; cur != nil; cur = cur.Next() {
        
    		//log.Debug("index :", index)
    		var in *avfilter.Context
    		//var args = "video_size=1280x720:pix_fmt=0:time_base=1/30:pixel_aspect=1/1"
    		inName := "in" + strconv.Itoa(index)
    		ret = avfilter.AvfilterGraphCreateFilter(&in, buffersrc, inName, args, 0, graph)
    		if ret < 0 {
        
    			log.Critical("AvfilterGraphCreateFilter Failed des : ", avutil.ErrorFromCode(ret))
    			return
    		}
    
    		par := avfilter.AvBuffersrcParametersAlloc()
    		if par == nil {
        
    			log.Critical("AvBuffersrcParametersAlloc Failed.")
    			return
    		}
    		par.SetHwFramesCtx(avutil.AVBufferRef(hw_frames_ref))
    		ret = in.AvBuffersrcParametersSet(par)
    		if ret < 0 {
        
    			log.Critical("AvBuffersrcParametersSet Failed.")
    			return
    		}
    		avutil.AvFreep(unsafe.Pointer(&par))
    
    		ins = append(ins, in)
    		ret = avfilter.AvfilterLink(ins[index], 0, cur.FilterContext(), cur.PadIdx())
    		if ret < 0 {
        
    			log.Critical("AvfilterLink Failed des : ", avutil.ErrorFromCode(ret))
    			return
    		}
    		index++
    	}
    
    	// outputs
    	index = 0
    	for cur := outputs; cur != nil; cur = cur.Next() {
        
    		var out *avfilter.Context
    		outName := "out" + strconv.Itoa(index)
    		ret = avfilter.AvfilterGraphCreateFilter(&out, buffersink, outName, "", 0, graph)
    		if ret < 0 {
        
    			log.Critical("AvfilterGraphCreateFilter Failed des : ", avutil.ErrorFromCode(ret))
    			return
    		}
    	
    		outs = append(outs, out)
    		ret = avfilter.AvfilterLink(cur.FilterContext(), cur.PadIdx(), outs[index], 0)
    		if ret < 0 {
        
    			log.Critical("AvfilterLink Failed des : ", avutil.ErrorFromCode(ret))
    			return
    		}
    		index++
    
    		f := avutil.AvFrameAlloc()
    		if f == nil {
        
    			log.Critical("AvFrameAlloc failed.")
    			return
    		}
    		frames = append(frames, f)
    	}
    
    	ret = graph.AvfilterGraphConfig(0)
    	if ret < 0 {
        
    		log.Critical("AvfilterGraphConfig Failed des : ", avutil.ErrorFromCode(ret))
    		return
    	}
    
    	overlayLatency := latency.New("vaapi", "overlay")
    
    
    	context_enc.SetHWFramesCtx(avutil.AVBufferRef(outs[0].AvBuffersinkGetHwFramesCtx()))
    
    	err = context_enc.AvcodecOpen2(codec_enc, nil)
    	if err < 0 {
        
    		log.Critical("AvcodecOpen2 failed.")
    		return
    	}
    
    	data, erro := ioutil.ReadFile(input_h264)
        if erro != nil {
        
            log.Debug("File reading error", erro)
            return
    	}
    	log.Debug("Open Success.")
    	l := len(data)
        log.Debug("size of file:", l)
    	
    	b := make([]byte, 4096 + 64)
    	
    	file, erro := os.Create(output_h264)
    	if erro != nil {
        
    		log.Critical("Error Reading")
    	}
    	defer file.Close()
    
    	var pts int64 = 0
    	//var opts int64 = 0
    
    	//var frames [25]*avutil.Frame
    	started := false
    	sum := 0
    	for sum < l {
        
    		remain := 4096
    		for remain > 0 {
        
    			copy(b, data[sum:sum + 4096])
    			if !started {
        
    				decLatency.Start()
    				started = true
    			}
    			n := context.AvParserParse2(parserContext, pkt, b, 
    				remain, avcodec.AV_NOPTS_VALUE, avcodec.AV_NOPTS_VALUE, 0)
    			log.Debug("parser ", n, "bytes")
    			
    			sum     = sum + n
    			remain  = remain - n;
    
    			//log.Trace("--------", dec.Packet().GetPacketSize())
    			if pkt.GetPacketSize() > 0 {
         // decode
    				//fmt.Println(decLatency.End())
    
    				ret := context.AvcodecSendPacket(pkt)
    				if ret < 0 {
        
    					log.Error("AvcodecSendPacket err ", avutil.ErrorFromCode(ret))
    					continue 
    				}
    			
    				ret = context.AvcodecReceiveFrame((*avcodec.Frame)(unsafe.Pointer(frame)))
    				if ret < 0 {
        
    					log.Error("AvcodecReceiveFrame err ", avutil.ErrorFromCode(ret))
    					continue 
    				}
    
    				if ret == 0 {
        
    					decLatency.End()
    					fmt.Println(decLatency.End())
    				} else {
        
    					continue
    				}
    
    				overlayLatency.Start()
    				pts++
    				frame.SetPts(pts)
    				
    				ret = avfilter.AvBuffersrcAddFrame(ins[0], (*avfilter.Frame)(unsafe.Pointer(frame)))
    				if ret < 0 {
        
    					fmt.Println("AvBuffersrcAddFrame error,", avutil.ErrorFromCode(ret))
    					continue
    				}
    
    				ret = avfilter.AvBufferSinkGetFrame(outs[0], (*avfilter.Frame)(unsafe.Pointer(frames[0])))
    
    				if ret == avutil.AvErrorEOF || ret == avutil.AvErrorEAGAIN {
        
    					log.Error(avutil.ErrorFromCode(ret))
    					continue
    				}
    			
    				if ret < 0 {
        
    					log.Error("AvBufferSinkGetFrame Failed des : ", ret, avutil.ErrorFromCode(ret))
    					continue
    				}
    			
    				frame = frames[0]
    
    				fmt.Println(overlayLatency.End())
    
    				if ret == 0 {
         // encode
    					started = false
    
    					//log.Debug("dec-frame:",frame)
    					
    					encLatency.Start()
    					ret = context_enc.AvcodecSendFrame((*avcodec.Frame)(unsafe.Pointer(frame)))
    					if ret < 0 {
        
    						log.Trace("AvcodecSendFrame err ", avutil.ErrorFromCode(ret))
    						continue
    					}
    				
    					ret = context_enc.AvcodecReceivePacket(pkt_enc)
    					if ret < 0 {
        
    						log.Trace("AvcodecReceivePacket err ", avutil.ErrorFromCode(ret))
    						continue
    					}
    					if ret == 0 {
        
    						data0 := pkt_enc.Data()
    						buf := make([]byte, pkt_enc.GetPacketSize())
    						start := uintptr(unsafe.Pointer(data0))
    						for i := 0; i < pkt_enc.GetPacketSize(); i++ {
        
    							elem := *(*uint8)(unsafe.Pointer(start + uintptr(i)))
    							buf[i] = elem
    						}
    						
    						file.Write(buf)
    						//encLatency.End()
    						fmt.Println(encLatency.End())
    					}
    
    					avutil.AvFrameUnref(frame)
    					//avutil.AvFrameUnref(oframe)
    
    				}
    
    			}
    		}
    	}	
    }
    
    func main() {
        
    	//decode_encode()
    	decode_overlay_encode()
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzE3MzA4MzIx_size_16_color_FFFFFF_t_70]  
![\[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-J4R2xzuh-1571826501260)(./1571826455075.png)\]][img-J4R2xzuh-1571826501260_._1571826455075.png]

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[img-J4R2xzuh-1571826501260_._1571826455075.png]: https://img-blog.csdnimg.cn/20191023182855549.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzE3MzA4MzIx,size_16,color_FFFFFF,t_70