本博客是摘自雷霄驊大神的課程《基于 FFmpeg + SDL 的視頻播放器的制作》課程 里的內容，非常適合音視頻小白入門，在這里感謝雷神的指導！

目錄

• FFmpeg和SDL的整合實現視頻播放
• 進階：脫離開發環境的獨立播放器

FFmpeg和SDL的整合實現視頻播放

整合方式
? FFmpeg解碼器實現了：視頻文件->YUV
? SDL視頻顯示實現了：YUV->屏幕
? FFmpeg+SDL整合之后實現了：視頻文件->YUV->屏幕

/*** 最簡單的基于FFmpeg的視頻播放器2(SDL升級版)* Simplest FFmpeg Player 2(SDL Update)** 雷霄驊 Lei Xiaohua* leixiaohua1020@126.com* 中國傳媒大學/數字電視技術* Communication University of China / Digital TV Technology* http://blog.csdn.net/leixiaohua1020** 本程序實現了視頻文件的解碼和顯示(支持HEVC，H.264，MPEG2等)。* 是最簡單的FFmpeg視頻解碼方面的教程。* 通過學習本例子可以了解FFmpeg的解碼流程。* 本版本中使用SDL消息機制刷新視頻畫面。* This software is a simplest video player based on FFmpeg.* Suitable for beginner of FFmpeg.**/#include <stdio.h>#define __STDC_CONSTANT_MACROSextern "C" { #include "libavcodec/avcodec.h" #include "libavformat/avformat.h" #include "libswscale/swscale.h" #include "libavutil/imgutils.h" #include "SDL.h" };//Refresh Event #define SFM_REFRESH_EVENT (SDL_USEREVENT + 1)#define SFM_BREAK_EVENT (SDL_USEREVENT + 2)int thread_exit = 0;int sfp_refresh_thread(void* opaque) {thread_exit = 0;while (!thread_exit) {SDL_Event event;event.type = SFM_REFRESH_EVENT;SDL_PushEvent(&event);SDL_Delay(40);}thread_exit = 0;//BreakSDL_Event event;event.type = SFM_BREAK_EVENT;SDL_PushEvent(&event);return 0; }int main(int argc, char* argv[]) {AVFormatContext* pFormatCtx;int i, videoindex;AVCodecContext* pCodecCtx;AVCodec* pCodec;AVFrame* pFrame, * pFrameYUV;uint8_t* out_buffer;AVPacket* packet;int ret, got_picture;//------------SDL----------------int screen_w, screen_h;SDL_Window* screen;SDL_Renderer* sdlRenderer;SDL_Texture* sdlTexture;SDL_Rect sdlRect;SDL_Thread* video_tid;SDL_Event event;struct SwsContext* img_convert_ctx;char filepath[] = "屌絲男士.mov";//av_register_all();avformat_network_init();pFormatCtx = avformat_alloc_context();if (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0) {printf("Couldn't open input stream.\n");return -1;}if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {printf("Couldn't find stream information.\n");return -1;}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("Didn't find a video stream.\n");return -1;}AVCodecParameters* codecParameters = pFormatCtx->streams[videoindex]->codecpar;pCodecCtx = avcodec_alloc_context3(nullptr);avcodec_parameters_to_context(pCodecCtx, codecParameters);//pCodecCtx = pFormatCtx->streams[videoindex]->codec;pCodec = (AVCodec*)avcodec_find_decoder(pCodecCtx->codec_id);if (pCodec == NULL) {printf("Codec not found.\n");return -1;}if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {printf("Could not open codec.\n");return -1;}packet = av_packet_alloc();pFrame = av_frame_alloc();pFrameYUV = av_frame_alloc();out_buffer = (uint8_t*)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1));av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1);img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt,pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER)) {printf("Could not initialize SDL - %s\n", SDL_GetError());return -1;}//SDL 2.0 Support for multiple windowsscreen_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\n", SDL_GetError());return -1;}sdlRenderer = SDL_CreateRenderer(screen, -1, 0);//IYUV: Y + U + V (3 planes)//YV12: Y + V + U (3 planes)sdlTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, pCodecCtx->width, pCodecCtx->height);sdlRect.x = 0;sdlRect.y = 0;sdlRect.w = screen_w;sdlRect.h = screen_h;packet = (AVPacket*)av_malloc(sizeof(AVPacket));video_tid = SDL_CreateThread(sfp_refresh_thread, NULL, NULL);//------------SDL End------------//Event Loopfor (;;) {//WaitSDL_WaitEvent(&event);if (event.type == SFM_REFRESH_EVENT) {//------------------------------if (av_read_frame(pFormatCtx, packet) >= 0) {if (packet->stream_index == videoindex) {if (avcodec_send_packet(pCodecCtx, packet) < 0) {printf("avcodec_send_packet failed!.\n");continue;}while (1) {ret = avcodec_receive_frame(pCodecCtx, pFrame);if (ret != 0)break;sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);//SDL---------------------------SDL_UpdateTexture(sdlTexture, NULL, pFrameYUV->data[0], pFrameYUV->linesize[0]);SDL_RenderClear(sdlRenderer);//SDL_RenderCopy( sdlRenderer, sdlTexture, &sdlRect, &sdlRect ); SDL_RenderCopy(sdlRenderer, sdlTexture, NULL, NULL);SDL_RenderPresent(sdlRenderer);//SDL End-----------------------}}av_packet_unref(packet);}else {//Exit Threadthread_exit = 1;}}else if (event.type == SDL_QUIT) {thread_exit = 1;}else if (event.type == SFM_BREAK_EVENT) {break;}}sws_freeContext(img_convert_ctx);SDL_Quit();//--------------av_frame_free(&pFrameYUV);av_frame_free(&pFrame);avcodec_close(pCodecCtx);avformat_close_input(&pFormatCtx);return 0; }

進階：脫離開發環境的獨立播放器

因為VS會生成可執行文件（在Debug文件夾中），利用argv參數進行視頻文件的選擇播放

main()函數的參數
? argc argv：全稱為ARGument Counter 和 ARGument Vector。其中argv存儲了來自于命令行的參數；而argc存儲了參數的個數。
? 例如在命令行中輸入“ffmpeg -i test.mkv test.ts ”，則argc取值為4， 而argv[]數組取值如下：
argv[0]=“ffmpeg”
argv[1]=“-i”
argv[2]=“test.mkv”
argv[3]=“test.ts”
? 動態鏈接庫（*.dll）
動態鏈接庫不能被編譯進應用程序。因而使用應用程序的時候必須在相同目錄下保存用到的動態鏈接庫文件。

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