转载地址：http://www.52codes.net/article/277.html
网上大多数的教程都是ffmpeg打开本地视频的教程，没有直接读取摄像头的教程的，有些摄像头都是rtsp的，这边吾爱的技术人员为大家提供了一个解决方案
ffmpeg直接获取摄像监控的rtsp实在远程监控，在线直播的功能
代码如下：
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#include "FFPlayVeido.h"FFPlayVedio::FFPlayVedio(HWND hwd){ char sdl_var[64]; sprintf(sdl_var, "SDL_WINDOWID=%d", hwd); //主窗口句柄 putenv(sdl_var); //初始化 av_register_all(); avformat_network_init(); if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) { printf("Could not initialize SDL - %s
", SDL_GetError()); return; }}FFPlayVedio::~FFPlayVedio(){}void FFPlayVedio::OnInit(HWND hwd){}void FFPlayVedio::GetVedioPlay( char *name){ AVFormatContext *pFormatCtx; int i, videoindex; AVCodecContext *pCodecCtx; AVCodec *pCodec; char filepath[] = "rtsp://admin:123456@192.168.1.252:554/mpeg4cif"; pFormatCtx = avformat_alloc_context(); if (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0){ printf("Couldn't open input stream.（无法打开输入流）
"); return ; } if (av_find_stream_info(pFormatCtx) < 0) { printf("Couldn't find stream information.（无法获取流信息）
"); return ; } videoindex = -1; for (i = 0; i < pFormatCtx->nb_streams; i++) if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { videoindex = i; break; } if (videoindex == -1) { printf("Didn't find a video stream.（没有找到视频流）
"); return ; } pCodecCtx = pFormatCtx->streams[videoindex]->codec; pCodec = avcodec_find_decoder(pCodecCtx->codec_id); if (pCodec == NULL) { printf("Codec not found.（没有找到解码器）
"); return ; } if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) { printf("Could not open codec.（无法打开解码器）
"); return ; } AVFrame *pFrame, *pFrameYUV; pFrame = avcodec_alloc_frame(); pFrameYUV = avcodec_alloc_frame(); uint8_t *out_buffer = (uint8_t *)av_malloc(avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height)); avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height); //SDL--------------------------- int screen_w = 0, screen_h = 0; //SDL 2.0 Support for multiple windows SDL_Window *screen; screen_w = pCodecCtx->width; screen_h = pCodecCtx->height; screen = SDL_CreateWindow("Simplest ffmpeg player's Window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, screen_w, screen_h, SDL_WINDOW_OPENGL); if (!screen) { printf("SDL: could not create window - exiting:%s
", SDL_GetError()); return ; } SDL_Renderer* sdlRenderer = SDL_CreateRenderer(screen, -1, 0); //IYUV: Y + U + V (3 planes) //YV12: Y + V + U (3 planes) SDL_Texture* sdlTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, pCodecCtx->width, pCodecCtx->height); SDL_Rect sdlRect; sdlRect.x = 0; sdlRect.y = 0; sdlRect.w = screen_w; sdlRect.h = screen_h; //SDL End---------------------- int ret, got_picture; AVPacket *packet = (AVPacket *)av_malloc(sizeof(AVPacket)); //Output Info----------------------------- printf("File Information（文件信息）---------------------
"); av_dump_format(pFormatCtx, 0, filepath, 0); printf("-------------------------------------------------
");#if OUTPUT_YUV420P FILE *fp_yuv = fopen("output.yuv", "wb+");#endif struct SwsContext *img_convert_ctx; img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); //------------------------------ while (av_read_frame(pFormatCtx, packet) >= 0) { if (packet->stream_index == videoindex) { ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet); if (ret < 0) { printf("Decode Error.（解码错误）
"); return ; } if (got_picture) { sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);#if OUTPUT_YUV420P int y_size = pCodecCtx->width*pCodecCtx->height; fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv); //Y fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv); //U fwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv); //V#endif //SDL--------------------------- SDL_UpdateTexture(sdlTexture, &sdlRect, pFrameYUV->data[0], pFrameYUV->linesize[0]); SDL_RenderClear(sdlRenderer); SDL_RenderCopy(sdlRenderer, sdlTexture, &sdlRect, &sdlRect); SDL_RenderPresent(sdlRenderer); //SDL End----------------------- //Delay 40ms SDL_Delay(40); } } av_free_packet(packet); } sws_freeContext(img_convert_ctx);#if OUTPUT_YUV420P fclose(fp_yuv);#endif SDL_Quit(); av_free(out_buffer); av_free(pFrameYUV); avcodec_close(pCodecCtx); avformat_close_input(&pFormatCtx); return ;}void FFPlayVedio::StopVedio(){} |
再附上直接获取摄像头监控保存MP4文件的代码：