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邹平网站设计,建视频网站,开发游戏怎么赚钱,免费平面设计软件有哪些这是在linux上usb摄像头视频预览程序#xff0c;此程序用到了ffmpeg、sdl2、gtk3组件#xff0c;程序编译之前应先安装他们。 #include sys/ioctl.h #include sys/stat.h #include sys/types.h #include fcntl.h #include zconf.h …这是在linux上usb摄像头视频预览程序此程序用到了ffmpeg、sdl2、gtk3组件程序编译之前应先安装他们。 #include sys/ioctl.h #include sys/stat.h #include sys/types.h #include fcntl.h #include zconf.h #include linux/videodev2.h #include sys/mman.h #include stdlib.h #include stdio.h #include string.h #include gtk-3.0/gtk/gtk.h#include libavcodec/avcodec.h #include libavformat/avformat.h #include libswscale/swscale.h #include libavdevice/avdevice.h #include libavutil/imgutils.h #include libavfilter/avfilter.h #include libavfilter/buffersrc.h #include libavfilter/buffersink.h#include SDL2/SDL.h//dhl:gtk窗口组件 GtkWidget *window; GtkWidget *fixed; GtkWidget *button1,*button2,*button3; GtkWidget *text,*text1,*text2,*text3; GtkTextBuffer *buffer,*buffer1,*buffer2,*buffer3; GtkWidget *label1,*label2,*label3,*label_line;//dhl:sdl窗口组件 SDL_Window *sdl_window; SDL_Renderer *sdl_renderer; SDL_Texture *sdl_texture;//dhl:消息缓存 char disp[2048]{0}; char temp[128]{0};int getWHR(char *device_name,char *win_size,int *win_width,int *win_height, char *frame_rate_t) {GtkTextIter start,end;gtk_text_buffer_get_bounds(GTK_TEXT_BUFFER(buffer1),start,end);GtkTextIter sstart,eend;sprintf(device_name,%s,gtk_text_buffer_get_text(GTK_TEXT_BUFFER(buffer1),s,e,FALSE));gtk_text_buffer_get_bounds(GTK_TEXT_BUFFER(buffer2),start,end);sstart,eend;gchar *win_size1 gtk_text_buffer_get_text(GTK_TEXT_BUFFER(buffer2),s,e,FALSE);sprintf(win_size,%s,gtk_text_buffer_get_text(GTK_TEXT_BUFFER(buffer2),s,e,FALSE));gtk_text_buffer_get_bounds(GTK_TEXT_BUFFER(buffer3),start,end);sstart,eend;sprintf(frame_rate_t,%s,gtk_text_buffer_get_text(GTK_TEXT_BUFFER(buffer3),s,e,FALSE));if (!strcmp(device_name,)|| !strcmp(win_size,)||!strcmp(frame_rate_t,)) {GtkWidget * dialog dialog gtk_message_dialog_new (NULL,GTK_DIALOG_DESTROY_WITH_PARENT,GTK_MESSAGE_INFO,GTK_BUTTONS_CLOSE,请输入摄像头设备名称、窗口尺寸、帧速率);gtk_dialog_run (GTK_DIALOG (dialog));gtk_widget_destroy (dialog);return -1;}sscanf(win_size1, %dx%d, win_width, win_height);return 0; }//dhl:发现摄像头 void button1_clicked(GtkWidget *widget, gpointer data) {char camera_devices_name[128]{0};for (int loop0;loop10;loop) {sprintf(camera_devices_name,/dev/video%d,loop);int fd open(camera_devices_name, O_RDWR);if(fd 0){printf(打开设备失败(%s)\n,camera_devices_name);close(fd);continue;}close(fd);sprintf(temp,发现摄像头:%s\n,camera_devices_name);strcat(disp,temp);gtk_text_buffer_set_text(buffer,disp,-1);}sprintf(disp,%s,); }//dhl:查询配置信息 void button2_clicked(GtkWidget *widget, gpointer data) {int line_num0;gchar *device_name;GtkTextIter start,end;gtk_text_buffer_get_bounds(GTK_TEXT_BUFFER(buffer1),start,end);const GtkTextIter sstart,eend;device_namegtk_text_buffer_get_text(GTK_TEXT_BUFFER(buffer1),s,e,FALSE);if (!strcmp(device_name,)){sprintf(temp,请输入摄像头设备文件名\n);strcat(disp,temp);gtk_text_buffer_set_text(buffer,disp,-1);sprintf(disp,%s,);return;}//dhl:查询摄像头支持的视频格式int fd open(device_name, O_RDWR);if(fd 0){printf(打开设备失败\n);return;}struct v4l2_fmtdesc v4fmt;v4fmt.type V4L2_BUF_TYPE_VIDEO_CAPTURE; //视频捕获设备int i0;while(1){v4fmt.index i;int ret ioctl(fd, VIDIOC_ENUM_FMT, v4fmt);if(ret 0){printf(获取摄像头格式失败);break;}printf(index%d\n, v4fmt.index);printf(flags%d\n, v4fmt.flags);printf(description%s\n, v4fmt.description);unsigned char *p (unsigned char )v4fmt.pixelformat;printf(pixelformat%c%c%c%c\n, p[0],p[1],p[2],p[3]);printf(reserved%d\n, v4fmt.reserved[0]);sprintf(temp,摄像头支持的视频格式(%d)\n,i);strcat(disp,temp);sprintf(temp,index%d,, v4fmt.index);strcat(disp,temp);sprintf(temp,flags%d,, v4fmt.flags);strcat(disp,temp);sprintf(temp,description%s,, v4fmt.description);strcat(disp,temp);sprintf(temp,pixelformat%c%c%c%c,, p[0],p[1],p[2],p[3]);strcat(disp,temp);sprintf(temp,reserved%d\n, v4fmt.reserved[0]);strcat(disp,temp);}close(fd);//dhl:MJPG支持的所有分辨率如下fd open(device_name, O_RDWR);if(fd 0){perror(打开设备失败);return;}struct v4l2_frmsizeenum frmsize;frmsize.index 0;frmsize.type V4L2_BUF_TYPE_VIDEO_CAPTURE;printf(MJPEG格式支持所有分辨率如下:\n);//frmsize.pixel_format V4L2_PIX_FMT_YUYV;frmsize.pixel_format V4L2_PIX_FMT_MJPEG;sprintf(temp,MJPG支持的分辨率:\n);strcat(disp,temp);line_num1;while(ioctl(fd,VIDIOC_ENUM_FRAMESIZES,frmsize) 0){printf(frame_size%d%d\n,frmsize.discrete.width,frmsize.discrete.height);frmsize.index;if ((line_num % 5) ! 0) { sprintf(temp,MJPEG frame_size%d%d, ,frmsize.discrete.width,frmsize.discrete.height);}else {sprintf(temp,MJPEG frame_size%d%d\n,frmsize.discrete.width,frmsize.discrete.height);}strcat(disp,temp);line_num;if (line_num 6) {line_num 1;}}close(fd);sprintf(temp,%s,\n);strcat(disp,temp);//dhl:YUV支持所有分辨率如下fd open(device_name, O_RDWR);if(fd 0){perror(打开设备失败);return;}//struct v4l2_frmsizeenum frmsize;frmsize.index 0;frmsize.type V4L2_BUF_TYPE_VIDEO_CAPTURE;printf(MJPEG格式支持所有分辨率如下:\n);frmsize.pixel_format V4L2_PIX_FMT_YUYV;//frmsize.pixel_format V4L2_PIX_FMT_MJPEG;sprintf(temp,YUV支持的分辨率:\n);strcat(disp,temp);line_num 1;while(ioctl(fd,VIDIOC_ENUM_FRAMESIZES,frmsize) 0){printf(frame_size%d%d\n,frmsize.discrete.width,frmsize.discrete.height);frmsize.index;if ((line_num % 5) ! 0) { sprintf(temp,YUYV frame_size%d%d, ,frmsize.discrete.width,frmsize.discrete.height);}else {sprintf(temp,YUYV frame_size%d*%d\n,frmsize.discrete.width,frmsize.discrete.height);}strcat(disp,temp);line_num;if (line_num 6) {line_num 1;}}close(fd);gtk_text_buffer_set_text(buffer,disp,-1);sprintf(disp,%s,);}//dhl:视频预览 void button3_clicked(GtkWidget *widget, gpointer data) {AVFormatContext *pFormatCtx;int i, videoindex;AVCodecContext *pCodecCtx;AVCodec *pCodec;int ret -1;int win_width0, win_height0;gchar device_name[128];gchar win_size[128];gchar frame_rate_t[128];int iRetgetWHR(device_name,win_size,win_width,win_height, frame_rate_t);if (iRet!0) {return;}const char * out_path out_yuyv422.yuv;FILE* outFile fopen(out_path, wb);if (!outFile) {printf(Could not open %s\n, out_path);return;}if (SDL_Init(SDL_INIT_VIDEO)) {printf(Could not initialize SDL - %s\n, SDL_GetError());return;}else{printf(initialize SDL ok\n);}sdl_window SDL_CreateWindow(视频预览,SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED,win_width,win_height,SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);if(sdl_window NULL){printf(SDL_window创建失败\n);return;}sdl_renderer SDL_CreateRenderer(sdl_window,-1,SDL_RENDERER_ACCELERATED);sdl_texture SDL_CreateTexture(sdl_renderer//,SDL_PIXELFORMAT_IYUV,SDL_PIXELFORMAT_YUY2,SDL_TEXTUREACCESS_TARGET,win_width,win_height);SDL_Rect sdl_rect;char *buffer_pixels malloc(win_width*win_height*4);pFormatCtx avformat_alloc_context();const AVInputFormat *ifmt av_find_input_format(v4l2);AVDictionary option NULL;av_dict_set(option,video_size,win_size,0);av_dict_set(option,framerate,frame_rate_t,0);//av_dict_set(option,pixel_format,yuv420p12be,0); //指定格式avformat_open_input(pFormatCtx, device_name, ifmt,option);if(avformat_find_stream_info(pFormatCtx, NULL) 0){printf(Couldnt find stream information.\n);return;}videoindex -1;for(i 0; i pFormatCtx-nb_streams; i){if(pFormatCtx-streams[i]-codecpar-codec_type AVMEDIA_TYPE_VIDEO){videoindex i;break;}}if(videoindex -1){printf(Didnt find a video stream.\n);return;}else{printf(Find a video stream:%d.\n, videoindex);}pCodec (AVCodec)avcodec_find_decoder(pFormatCtx-streams[videoindex]-codecpar-codec_id);if(pCodec NULL){printf(Codec not found.\n);return;}pCodecCtx avcodec_alloc_context3(pCodec);avcodec_parameters_to_context(pCodecCtx, pFormatCtx-streams[videoindex]-codecpar);printf(VideoStream:Frame.Width%d,Height%d\n,pCodecCtx-width, pCodecCtx-height);if(avcodec_open2(pCodecCtx, pCodec, NULL) 0){printf(Could not open codec.\n);return;}AVPacket *pkt av_packet_alloc();if(!pkt){printf(av_packet_alloc错误\n);return;}AVFrame *frame_yuyv422 av_frame_alloc();if(!frame_yuyv422){printf(av_frame_alloc错误\n);return;}int frame_count 0;//记录获取的帧数SDL_Event event;while (av_read_frame(pFormatCtx, pkt) 0 ) {if(pkt-stream_index videoindex){//dhl:发送给解码器if(avcodec_send_packet(pCodecCtx,pkt) ! 0){printf(avcodec_send_packet error …\n);break;}//dhl:从解码器中得到摄像头的原始视频帧int loop0;while(avcodec_receive_frame(pCodecCtx,frame_yuyv422) 0){frame_count;for(int i 0;i frame_yuyv422-height;i){memcpy(buffer_pixelsi * frame_yuyv422-linesize[0],frame_yuyv422-data[0] i * frame_yuyv422-linesize[0],frame_yuyv422-linesize[0]);}SDL_UpdateTexture(sdl_texture,NULL,buffer_pixels,win_width*2);//dhl:将纹理数据拷贝给渲染器sdl_rect.x 0;sdl_rect.y 0;sdl_rect.w win_width;sdl_rect.h win_height;//dhl:先清空帧画面再重新绘制SDL_RenderClear(sdl_renderer);SDL_RenderCopy(sdl_renderer,sdl_texture,NULL,sdl_rect);//dhl:显示帧画面SDL_RenderPresent(sdl_renderer);//dhl:延时渲染//SDL_Delay(frame_rate);//延时}}av_packet_unref(pkt);for (int ll0;ll10;ll) {SDL_PollEvent(event);} if (event.type SDL_QUIT) {break;}}fclose(outFile);sprintf(disp,预览总帧数%d,frame_count);gtk_text_buffer_set_text(buffer,disp,-1);sprintf(disp,%s,);av_free(frame_yuyv422);av_packet_free(pkt);avformat_close_input(pFormatCtx);free(buffer_pixels);SDL_DestroyTexture(sdl_texture);SDL_DestroyRenderer(sdl_renderer);SDL_DestroyWindow(sdl_window ); SDL_Quit();return;}int main(int argc,char *argv[]) {gtk_init(argc,argv);avdevice_register_all();window gtk_window_new(GTK_WINDOW_TOPLEVEL);gtk_window_set_title(GTK_WINDOW(window),USB摄像头测试程序(v1.0.20230728));//gtk_window_set_resizable(GTK_WINDOW(window),FALSE);gtk_window_set_default_size(GTK_WINDOW(window),1280,800);gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER);fixed gtk_fixed_new();gtk_container_add(GTK_CONTAINER(window),fixed);text gtk_text_view_new();buffergtk_text_view_get_buffer(GTK_TEXT_VIEW(text));gtk_text_buffer_set_text(buffer,,-1);gtk_fixed_put(GTK_FIXED(fixed),text,20,480);gtk_widget_set_size_request(text,1240,300);button1 gtk_button_new_with_label(查询摄像头);gtk_fixed_put(GTK_FIXED(fixed),button1,320,14);gtk_widget_set_size_request(button1,100,20);label1 gtk_label_new(摄像头);gtk_fixed_put(GTK_FIXED(fixed),label1,440,14);gtk_widget_set_size_request(label1,50,30);text1 gtk_text_view_new();buffer1gtk_text_view_get_buffer(GTK_TEXT_VIEW(text1));gtk_text_buffer_set_text(buffer1,,-1);gtk_fixed_put(GTK_FIXED(fixed),text1,500,16);gtk_widget_set_size_request(text1,100,28);sprintf(disp,/dev/video0);gtk_text_buffer_set_text(buffer1,disp,-1);button2 gtk_button_new_with_label(查询配置);gtk_fixed_put(GTK_FIXED(fixed),button2,610,14);gtk_widget_set_size_request(button2,80,35);label2 gtk_label_new(分辨率);gtk_fixed_put(GTK_FIXED(fixed),label2,740,18);gtk_widget_set_size_request(label2,50,30);text2 gtk_text_view_new();buffer2gtk_text_view_get_buffer(GTK_TEXT_VIEW(text2));gtk_text_buffer_set_text(buffer2,,-1);gtk_fixed_put(GTK_FIXED(fixed),text2,800,16);gtk_widget_set_size_request(text2,100,28);sprintf(disp,640x480);gtk_text_buffer_set_text(buffer2,disp,-1);label3 gtk_label_new(帧率);gtk_fixed_put(GTK_FIXED(fixed),label3,930,18);gtk_widget_set_size_request(label3,50,30);text3 gtk_text_view_new();buffer3gtk_text_view_get_buffer(GTK_TEXT_VIEW(text3));gtk_text_buffer_set_text(buffer3,,-1);gtk_fixed_put(GTK_FIXED(fixed),text3,980,16);gtk_widget_set_size_request(text3,100,28);sprintf(disp,30);gtk_text_buffer_set_text(buffer3,disp,-1);label_line gtk_label_new(______________________________________________________________________________________________________________________________);gtk_fixed_put(GTK_FIXED(fixed),label_line,320,45);gtk_widget_set_size_request(label_line,800,3);GtkWidget *labelChild;PangoFontDescription *font;int fontSize 10;font pango_font_description_from_string(Sans); //Sans字体名pango_font_description_set_size(font, fontSize * PANGO_SCALE); //设置字体大小labelChild gtk_bin_get_child(GTK_WIDGET(button1)); //取出GtkButton里的labelgtk_widget_modify_font(GTK_WIDGET(labelChild), font); //设置label的字体 这样这个GtkButton上面显示的字体就变了labelChild gtk_bin_get_child(GTK_WIDGET(button2)); gtk_widget_modify_font(GTK_WIDGET(labelChild), font); button3 gtk_button_new_with_label(视频预览);gtk_fixed_put(GTK_FIXED(fixed),button3,320,80);gtk_widget_set_size_request(button3,80,20);g_signal_connect_swapped(G_OBJECT(window),destroy,G_CALLBACK(gtk_main_quit),NULL);g_signal_connect_swapped(G_OBJECT(window),destroy,G_CALLBACK(gtk_main_quit),NULL);g_signal_connect(G_OBJECT(button1), clicked, G_CALLBACK(button1_clicked),NULL);g_signal_connect(G_OBJECT(button2), clicked, G_CALLBACK(button2_clicked),NULL);g_signal_connect(G_OBJECT(button3), clicked, G_CALLBACK(button3_clicked),NULL); gtk_widget_show_all(window);gtk_main();return 0; } 编译命令gcc preview_camera.c  -o camera_preview pkg-config –cflags –libs  libavdevice libavfilter libavformat  libavcodec libavutil libpostproc  libswresample  libswscale pkg-config –cflags –libs sdl2 pkg-config –cflags –libs gtk-3.0  -w 运行截图