商城网站的建设费用,wordpress 域名配置,网站设计论文提纲,asp网站如何运行2023-03-15#xff1a;屏幕录制并且显示视频#xff0c;不要用命令。代码用go语言编写。
答案2023-03-15#xff1a;
使用moonfdd/ffmpeg-go和moonfdd/sdl2-go库来实现屏幕录制并显示视频#xff0c;大体流程如下#xff1a;
1.使用libavdevice库中的AVInputFormat屏幕录制并且显示视频不要用命令。代码用go语言编写。
答案2023-03-15
使用moonfdd/ffmpeg-go和moonfdd/sdl2-go库来实现屏幕录制并显示视频大体流程如下
1.使用libavdevice库中的AVInputFormat输入格式、AVDeviceCapabilitiesQuery设备能力查询和AVFormatContext格式上下文获取桌面录制器的设备信息。 2.使用libavcodec库中的AVCodec、AVCodecContext、AVFrame和AVPacket结构体编码和解码视频帧。 3.使用libavutil库中的函数分配内存空间并创建一个SwsContext色彩空间转换上下文对象以及SDL库中的窗口和渲染器对象。 4.在循环中读取屏幕捕获器的每一帧数据并将其解码。然后直接将YUV420P格式的图像传递给SDL库中的渲染器进行显示。
代码调用了以下结构体
AVInputFormat AVDeviceCapabilitiesQuery AVFormatContext AVCodec AVCodecContext AVFrame AVPacket SwsContext SDL窗口对象 SDL渲染器对象
释放资源的步骤包括
1.关闭SDL渲染器和窗口。 2.释放AVFrame和AVPacket对象。 3.关闭libavcodec库中的AVCodecContext。 4.关闭libavformat库中的AVFormatContext。 5.关闭libavdevice库中的AVInputFormat。 6.释放libavutil库中的内存空间。
代码见github.com/moonfdd/ffmpeg-go-examples。
执行命令
go run ./examples/leixiaohua1020/simplest_ffmpeg_grabdesktop/main.go代码参考了雷霄骅的屏幕录制并播放显示代码用golang编写。代码如下
// https://github.com/leixiaohua1020/simplest_ffmpeg_device/blob/master/simplest_ffmpeg_grabdesktop/simplest_ffmpeg_grabdesktop.cpp
package mainimport (fmtostimeunsafegithub.com/moonfdd/ffmpeg-go/ffcommongithub.com/moonfdd/ffmpeg-go/libavcodecgithub.com/moonfdd/ffmpeg-go/libavdevicegithub.com/moonfdd/ffmpeg-go/libavformatgithub.com/moonfdd/ffmpeg-go/libavutilgithub.com/moonfdd/ffmpeg-go/libswscalesdl github.com/moonfdd/sdl2-go/sdl2github.com/moonfdd/sdl2-go/sdlcommon
)// Output YUV420P
const OUTPUT_YUV420P 0// 1 Use Dshow
// 0 Use GDIgrab
const USE_DSHOW 0// Refresh Event
const SFM_REFRESH_EVENT (sdl.SDL_USEREVENT 1)
const SFM_BREAK_EVENT (sdl.SDL_USEREVENT 2)var thread_exit ffcommon.FInt 0
var ispush truefunc sfp_refresh_thread(opaque ffcommon.FVoidP) uintptr {// thread_exit 0for thread_exit 0 {var event sdl.SDL_Eventevent.Type SFM_REFRESH_EVENTif ispush {event.SDL_PushEvent()ispush false}sdl.SDL_Delay(40)}fmt.Println(sfp_refresh_thread 发送退出事件)// thread_exit 0//Breakvar event sdl.SDL_Eventevent.Type SFM_BREAK_EVENTevent.SDL_PushEvent()return 0
}// Show Dshow Device
func show_dshow_device() {pFormatCtx : libavformat.AvformatAllocContext()var options *libavutil.AVDictionarylibavutil.AvDictSet(options, list_devices, true, 0)iformat : libavformat.AvFindInputFormat(dshow)fmt.Printf(Device Info\n)libavformat.AvformatOpenInput(pFormatCtx, videodummy, iformat, options)fmt.Printf(\n)
}// Show AVFoundation Device
func show_avfoundation_device() {pFormatCtx : libavformat.AvformatAllocContext()var options *libavutil.AVDictionarylibavutil.AvDictSet(options, list_devices, true, 0)iformat : libavformat.AvFindInputFormat(avfoundation)fmt.Printf(AVFoundation Device Info\n)libavformat.AvformatOpenInput(pFormatCtx, , iformat, options)fmt.Printf(\n)
}func main0() (ret ffcommon.FInt) {var pFormatCtx *libavformat.AVFormatContextvar i, videoindex ffcommon.FIntvar pCodecCtx *libavcodec.AVCodecContextvar pCodec *libavcodec.AVCodecvar ifmt *libavformat.AVInputFormatlibavformat.AvRegisterAll()libavformat.AvformatNetworkInit()pFormatCtx libavformat.AvformatAllocContext()//Open File//char filepath[]src01_480x272_22.h265;//avformat_open_input(pFormatCtx,filepath,NULL,NULL)//Register Devicelibavdevice.AvdeviceRegisterAll()//Windowsif USE_DSHOW ! 0 {//Use dshow////Need to Install screen-capture-recorder//screen-capture-recorder//Website: http://sourceforge.net/projects/screencapturer///ifmt libavformat.AvFindInputFormat(dshow)if libavformat.AvformatOpenInput(pFormatCtx, videoscreen-capture-recorder, ifmt, nil) ! 0 {fmt.Printf(Couldnt open input stream1.\n)return -1}} else {//Use gdigrabvar options *libavutil.AVDictionary//Set some options//grabbing frame rate//av_dict_set(options,framerate,5,0);//The distance from the left edge of the screen or desktop//av_dict_set(options,offset_x,20,0);//The distance from the top edge of the screen or desktop//av_dict_set(options,offset_y,40,0);//Video frame size. The default is to capture the full screen//av_dict_set(options,video_size,640x480,0);// libavutil.AvDictSet(options, probesize, 100000000, 0)ifmt libavformat.AvFindInputFormat(gdigrab)if libavformat.AvformatOpenInput(pFormatCtx, desktop, ifmt, options) ! 0 {fmt.Printf(Couldnt open input stream2.\n)return -1}}if pFormatCtx.AvformatFindStreamInfo(nil) 0 {fmt.Println(Couldnt find stream information.)return -1}videoindex -1for i 0; i int32(pFormatCtx.NbStreams); i {if pFormatCtx.GetStream(uint32(i)).Codec.CodecType libavutil.AVMEDIA_TYPE_VIDEO {videoindex ibreak}}if videoindex -1 {fmt.Printf(Didnt find a video stream.\n)return -1}pCodecCtx pFormatCtx.GetStream(uint32(videoindex)).CodecpCodec libavcodec.AvcodecFindDecoder(pCodecCtx.CodecId)if pCodec nil {fmt.Printf(Codec not found.\n)return -1}if pCodecCtx.AvcodecOpen2(pCodec, nil) 0 {fmt.Printf(Could not open codec.\n)return -1}var pFrame, pFrameYUV *libavutil.AVFramepFrame libavutil.AvFrameAlloc()pFrameYUV libavutil.AvFrameAlloc()//unsigned char *out_buffer(unsigned char *)av_malloc(avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx-width, pCodecCtx-height));//avpicture_fill((AVPicture *)pFrameYUV, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx-width, pCodecCtx-height);out_buffer : (*byte)(unsafe.Pointer(libavutil.AvMalloc(uint64(libavcodec.AvpictureGetSize(int32(libavutil.AV_PIX_FMT_YUV420P), pCodecCtx.Width, pCodecCtx.Height)))))((*libavcodec.AVPicture)(unsafe.Pointer(pFrameYUV))).AvpictureFill(out_buffer, libavutil.AV_PIX_FMT_YUV420P, pCodecCtx.Width, pCodecCtx.Height)//SDL----------------------------// if sdl.SDL_Init(sdl.SDL_INIT_VIDEO|sdl.SDL_INIT_AUDIO|sdl.SDL_INIT_TIMER) ! 0 {if sdl.SDL_Init(sdl.SDL_INIT_VIDEO) ! 0 {fmt.Printf(Could not initialize SDL - %s\n, sdl.SDL_GetError())return -1}var screen_w, screen_h ffcommon.FInt 640, 360var mode *sdl.SDL_DisplayMode new(sdl.SDL_DisplayMode)if sdl.SDL_GetCurrentDisplayMode(0, mode) ! 0 {fmt.Printf(SDL: could not get current display mode - exiting:%s\n, sdl.SDL_GetError())return -1}//Half of the Desktops width and height.screen_w mode.W / 2screen_h mode.H / 2window : sdl.SDL_CreateWindow(Simplest FFmpeg Grab Desktop, sdl.SDL_WINDOWPOS_UNDEFINED, sdl.SDL_WINDOWPOS_UNDEFINED, screen_w, screen_h, 0)if window nil {fmt.Printf(SDL: could not create window - exiting:%s\n, sdl.SDL_GetError())return -1}defer window.SDL_DestroyWindow()renderer : window.SDL_CreateRenderer(-1, 0)if renderer nil {fmt.Printf(SDL: could not create renderer - exiting:%s\n, sdl.SDL_GetError())return -1}defer renderer.SDL_DestroyRenderer()texture : renderer.SDL_CreateTexture(sdl.SDL_PIXELFORMAT_YV12,sdl.SDL_TEXTUREACCESS_STREAMING,pCodecCtx.Width,pCodecCtx.Height)defer texture.SDL_DestroyTexture()window.SDL_ShowWindow()time.Sleep(2 * time.Second)var rect sdl.SDL_Rectrect.X 0rect.Y 0rect.W screen_wrect.H screen_hvar rect2 sdl.SDL_Rectrect2.X 0rect2.Y 0rect2.W mode.Wrect2.H mode.H//SDL End------------------------// var got_picture ffcommon.FInt//AVPacket *packet(AVPacket *)av_malloc(sizeof(AVPacket));packet : libavcodec.AVPacket{}var fp_yuv *os.Fileif OUTPUT_YUV420P ! 0 {fp_yuv, _ os.Create(output.yuv)}var img_convert_ctx *libswscale.SwsContextimg_convert_ctx libswscale.SwsGetContext(pCodecCtx.Width, pCodecCtx.Height, pCodecCtx.PixFmt, pCodecCtx.Width, pCodecCtx.Height, libavutil.AV_PIX_FMT_YUV420P, libswscale.SWS_BICUBIC, nil, nil, nil)//------------------------------//video_tid : sdl.SDL_CreateThread(sfp_refresh_thread, nil)//go sfp_refresh_thread(uintptr(0))//sdl.SDL_CreateThread(sfp_refresh_thread, , uintptr(0))//Event Loopvar event sdl.SDL_Eventfor {//Waitispush trueevent.SDL_WaitEvent()if event.Type SFM_REFRESH_EVENT {//------------------------------if pFormatCtx.AvReadFrame(packet) 0 {if int32(packet.StreamIndex) videoindex {if pCodecCtx.AvcodecSendPacket(packet) 0 {packet.AvPacketUnref()continue}ret pCodecCtx.AvcodecReceiveFrame(pFrame)if ret 0 {fmt.Printf(Decode Error.\n)return -1}if ret 0 {// if got_picture ! 0 {img_convert_ctx.SwsScale((**byte)(unsafe.Pointer(pFrame.Data)), (*int32)(unsafe.Pointer(pFrame.Linesize)), 0, uint32(pCodecCtx.Height), (**byte)(unsafe.Pointer(pFrameYUV.Data)), (*int32)(unsafe.Pointer(pFrameYUV.Linesize)))if OUTPUT_YUV420P ! 0 {y_size : pCodecCtx.Width * pCodecCtx.Heightfp_yuv.Write(ffcommon.ByteSliceFromByteP(pFrameYUV.Data[0], int(y_size))) //Yfp_yuv.Write(ffcommon.ByteSliceFromByteP(pFrameYUV.Data[1], int(y_size)/4)) //Ufp_yuv.Write(ffcommon.ByteSliceFromByteP(pFrameYUV.Data[2], int(y_size)/4)) //V}texture.SDL_UpdateYUVTexture(rect2,pFrameYUV.Data[0], pFrameYUV.Linesize[0],pFrameYUV.Data[1], pFrameYUV.Linesize[1],pFrameYUV.Data[2], pFrameYUV.Linesize[2])renderer.SDL_RenderClear()renderer.SDL_RenderCopy(texture, nil, rect)renderer.SDL_RenderPresent()}}packet.AvPacketUnref()} else {//Exit Threadthread_exit 1fmt.Println(main 准备退出 1)}} else if event.Type sdl.SDL_QUIT {thread_exit 1fmt.Println(main 准备退出 2)} else if event.Type SFM_BREAK_EVENT {fmt.Println(退出循环 3)break}}img_convert_ctx.SwsFreeContext()if OUTPUT_YUV420P ! 0 {fp_yuv.Close()}sdl.SDL_Quit()libavutil.AvFree(uintptr(unsafe.Pointer(out_buffer)))libavutil.AvFree(uintptr(unsafe.Pointer(pFrame)))libavutil.AvFree(uintptr(unsafe.Pointer(pFrameYUV)))pCodecCtx.AvcodecClose()libavformat.AvformatCloseInput(pFormatCtx)return 0
}func main() {os.Setenv(Path, os.Getenv(Path);./lib/windows/ffmpeg)ffcommon.SetAvutilPath(./lib/windows/ffmpeg/avutil-56.dll)ffcommon.SetAvcodecPath(./lib/windows/ffmpeg/avcodec-58.dll)ffcommon.SetAvdevicePath(./lib/windows/ffmpeg/avdevice-58.dll)ffcommon.SetAvfilterPath(./lib/windows/ffmpeg/avfilter-56.dll)ffcommon.SetAvformatPath(./lib/windows/ffmpeg/avformat-58.dll)ffcommon.SetAvpostprocPath(./lib/windows/ffmpeg/postproc-55.dll)ffcommon.SetAvswresamplePath(./lib/windows/ffmpeg/swresample-3.dll)ffcommon.SetAvswscalePath(./lib/windows/ffmpeg/swscale-5.dll)sdlcommon.SetSDL2Path(./lib/windows/sdl/SDL2.0.16.dll)genDir : ./out_, err : os.Stat(genDir)if err ! nil {if os.IsNotExist(err) {os.Mkdir(genDir, 0777) // Everyone can read write and execute}}// go func() {// time.Sleep(1000)// exec.Command(./lib/ffplay.exe, rtmp://localhost/publishlive/livestream).Output()// if err ! nil {// fmt.Println(play err , err)// }// }()main0()
}
