FFMPEG+SDL2.0解码视频播放器下载_Word模板_6

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FFMPEG+SDL2.0解码视频播放器#include "stdafx.h" extern "C"{ #include "libavcodec\avcodec.h" #include "libavformat\avformat.h" #include "libswscale\swscale.h" #include "sdl\SDL.h" #include "sdl\SDL_test_images.h" #include "sdl\SDL_thread.h" } #include #include /* void...

#include "stdafx.h" extern "C"{ #include "libavcodec\avcodec.h" #include "libavformat\avformat.h" #include "libswscale\swscale.h" #include "sdl\SDL.h" #include "sdl\SDL_test_images.h" #include "sdl\SDL_thread.h" } #include #include /* void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame){ FILE *pFile; char szFilename[32]; int y; sprintf(szFilename, "frame%d.ppm", iFrame); pFile = fopen(szFilename, "wb"); if (pFile == NULL){ cout << "open file:" << szFilename << " error." << endl; return; } //Write header }*/ //SDL2.lib;swscale.lib;postproc.lib;swresample.lib;avcodec.lib;avdevice.lib;avfilter.lib;avformat.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies) int _tmain(int argc, char *agrv[]){ av_register_all(); //注册了所有的文件格式和编解码的库，它们将被自动的使用在被打开的合适格式的文件上 AVFormatContext *pFormatCtx; pFormatCtx = avformat_alloc_context(); char filepath[] = "D:\\迅雷下载\\12.rmvb"; //Open an input stream and read the header if (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0){ printf("Can't open the file\n"); SDL_Delay(500); return -1; } //Retrieve stream information if (avformat_find_stream_info(pFormatCtx, NULL) < 0){ printf("Couldn't find stream information.\n"); return -1; } int i, videoIndex; AVCodecContext *pCodecCtx; AVCodec *pCodec; //Find the first video stream videoIndex = -1; for (i = 0; i < pFormatCtx->nb_streams; i++){//视音频流的个数 if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO){ videoIndex = i; break; } } if (videoIndex == -1) return -1; //Get a pointer to the codec context for the video stream //流中关于编解码器的信息就是被我们叫做"codec context"（编解码器上下文） //的东西。这里面包含了流中所使用的关于编解码器的所有信 pCodecCtx = pFormatCtx->streams[videoIndex]->codec; //Find the decoder for the video stream pCodec = avcodec_find_decoder(pCodecCtx->codec_id); if (pCodec == NULL){ printf("Unsupported codec!\n"); return -1; } //Open codec if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0){ printf("Could not open codec.\n"); return -1; } //allocate video frame and set its fileds to default value AVFrame *pFrame, *pFrameYUV; pFrame = av_frame_alloc(); pFrameYUV = av_frame_alloc(); //即使我们申请了一帧的内存，当转换的时候，我们仍然需要一个地方来放置原始 //的数据。我们使用avpicture_get_size 来获得我们需要的大小，然后手工申请 //内存空间： uint8_t *out_buffer; int numBytes; numBytes = avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height); //av_malloc 是ffmpeg 的malloc，用来实现一个简单的malloc 的包装，这样来保 //证内存地址是对齐的（4 字节对齐或者2 字节对齐）。它并不能保护你不被内 //存泄漏，重复释放或者其它malloc 的问

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所困扰。 out_buffer = (uint8_t *)av_malloc(numBytes*sizeof(uint8_t)); //Assign appropriate parts of buffer to image planes in pFrameYUV //Note that pFrameYUV is an AVFrame, but AVFrame is a superset of AVPicture avpicture_fill((AVPicture*)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height); //----------------SDL--------------------------------------// if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)){ printf("Could not initialize SDL -%s\n", SDL_GetError()); exit(1); } SDL_Window *window = nullptr; window = SDL_CreateWindow("MyPlayer", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, pCodecCtx->width, pCodecCtx->height, SDL_WINDOW_SHOWN); if (!window){ printf("Could not initialize SDL -%s\n", SDL_GetError()); return 1; } SDL_Renderer *ren = nullptr; ren = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC); if (ren == nullptr){ printf("%s\n", SDL_GetError() ); return -1; } SDL_Texture *texture = nullptr; texture = SDL_CreateTexture(ren, SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING, pCodecCtx->width, pCodecCtx->height); SDL_Rect rect; rect.x = 0, rect.y = 0; rect.w = pCodecCtx->width; rect.h = pCodecCtx->height; //*************************************************************// //通过读取包来读取整个视频流，然后把它解码成帧，最后转换格式并且保存 int frameFinished; //int psize = pCodecCtx->width * pCodecCtx->height; AVPacket packet; av_new_packet(&packet, numBytes); //output file information printf(" ---------------------------------\n"); av_dump_format(pFormatCtx, 0, filepath, 0); printf("-----------------------------------------\n"); i = 0; int ret; static 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); //Read the next frame of a stream while (av_read_frame(pFormatCtx, &packet) >= 0){ //Is this a packet from the video stream? if (packet.stream_index == videoIndex){ //decode video frame of size packet.size from packet.data into picture ret = avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet); //Did we get a video frame? if (ret >= 0){ //Convert the image from its native format to YUV if (frameFinished){ sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize); SDL_UpdateYUVTexture(texture, &rect, pFrameYUV->data[0], pFrameYUV->linesize[0], pFrameYUV->data[1], pFrameYUV->linesize[1], pFrameYUV->data[2], pFrameYUV->linesize[2]); SDL_RenderClear(ren); SDL_RenderCopy(ren, texture, &rect, &rect); SDL_RenderPresent(ren); } SDL_Delay(50); } else{ printf("%s\n", "decode error"); return -1; } } } av_free_packet(&packet); SDL_Event event; SDL_PollEvent(&event); switch (event.type){ case SDL_QUIT: SDL_Quit(); exit(0); break; default: break; } SDL_DestroyTexture(texture); av_frame_free(&pFrame); av_frame_free(&pFrameYUV); avcodec_close(pCodecCtx); avformat_close_input(&pFormatCtx); return 0; }

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FFMPEG+SDL2.0解码视频播放器

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