=====================================================

最簡單的基于FFmpeg的視頻播放器系列文章列表：

100行代碼實現最簡單的基于FFMPEG+SDL的視頻播放器（SDL1.x）

最簡單的基于FFMPEG+SDL的視頻播放器 ver2 （采用SDL2.0）

最簡單的基于FFmpeg的解碼器-純凈版（不包含libavformat）

最簡單的基于FFMPEG+SDL的視頻播放器：拆分-解碼器和播放器

最簡單的基于FFMPEG的Helloworld程序

=====================================================

簡介

之前做過一個FFMPEG+SDL的簡單播放器：《100行代碼實現最簡單的基于FFMPEG+SDL的視頻播放器》。該播放器采用SDL1.2顯示視頻。最近有不少人反映SDL已經升級到2.0版本了，甚至官網的Wiki上都只有SDL2.0的文檔了，因此下載了SDL 2.0 并且進行了簡單的研究。隨后對此前的播放器進行了修改，將SDL1.2換成了SDL2.0。

注：《100行代碼實現最簡單的基于FFMPEG+SDL的視頻播放器》文章中提到的很多知識這里不再重復記錄。本文重點記錄SDL1.2與SDL2.0的不同。

平臺使用了VC2010，FFmpeg類庫使用了最近的版本，SDL使用2.0版本。

Simplest FFmpeg Player 2

項目主頁

SourceForge：https://sourceforge.net/projects/simplestffmpegplayer/

Github：https://github.com/leixiaohua1020/simplest_ffmpeg_player

開源中國：http://git.oschina.net/leixiaohua1020/simplest_ffmpeg_player

流程圖

FFmpeg解碼一個視頻流程如下圖所示：

SDL2.0顯示YUV的流程圖：

對比SDL1.2的流程圖，發現變化還是很大的。幾乎所有的API都發生了變化。但是函數和變量有一定的對應關系：

SDL_SetVideoMode()————SDL_CreateWindow()

SDL_Surface————SDL_Window

SDL_CreateYUVOverlay()————SDL_CreateTexture()

SDL_Overlay————SDL_Texture

不再一一例舉。

下圖為SDL1.x顯示YUV的流程圖。

簡單解釋各個變量的作用：

SDL_Window就是使用SDL的時候彈出的那個窗口。在SDL1.x版本中，只可以創建一個一個窗口。在SDL2.0版本中，可以創建多個窗口。
SDL_Texture用于顯示YUV數據。一個SDL_Texture對應一幀YUV數據。
SDL_Renderer用于渲染SDL_Texture至SDL_Window。
SDL_Rect用于確定SDL_Texture顯示的位置。注意：一個SDL_Texture可以指定多個不同的SDL_Rect，這樣就可以在SDL_Window不同位置顯示相同的內容（使用SDL_RenderCopy()函數）。
它們的關系如下圖所示：

下圖舉了個例子，指定了4個SDL_Rect，可以實現4分屏的顯示。

simplest_ffmpeg_player（標準版）代碼

最基礎的版本，學習的開始。

[cpp]?view plaincopy

/**?

?*?最簡單的基于FFmpeg的視頻播放器?2?

?*?Simplest?FFmpeg?Player?2?

?*?

?*?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?

?*?

?*?第2版使用SDL2.0取代了第一版中的SDL1.2?

?*?Version?2?use?SDL?2.0?instead?of?SDL?1.2?in?version?1.?

?*?

?*?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。?

?*?This?software?is?a?simplest?video?player?based?on?FFmpeg.?

?*?Suitable?for?beginner?of?FFmpeg.?

?*?

?*/??

??

??

??

#include?<stdio.h>??

??

#define?__STDC_CONSTANT_MACROS??

??

#ifdef?_WIN32??

//Windows??

extern?"C"??

{??

#include?"libavcodec/avcodec.h"??

#include?"libavformat/avformat.h"??

#include?"libswscale/swscale.h"??

#include?"libavutil/imgutils.h"??

#include?"SDL2/SDL.h"??

};??

#else??

//Linux...??

#ifdef?__cplusplus??

extern?"C"??

{??

#endif??

#include?<libavcodec/avcodec.h>??

#include?<libavformat/avformat.h>??

#include?<libswscale/swscale.h>??

#include?<SDL2/SDL.h>??

#include?<libavutil/imgutils.h>??

#ifdef?__cplusplus??

};??

#endif??

#endif??

??

//Output?YUV420P?data?as?a?file???

#define?OUTPUT_YUV420P?0??

??

int?main(int?argc,?char*?argv[])??

{??

????AVFormatContext?*pFormatCtx;??

????int?????????????i,?videoindex;??

????AVCodecContext??*pCodecCtx;??

????AVCodec?????????*pCodec;??

????AVFrame?*pFrame,*pFrameYUV;??

????unsigned?char?*out_buffer;??

????AVPacket?*packet;??

????int?y_size;??

????int?ret,?got_picture;??

????struct?SwsContext?*img_convert_ctx;??

??

????char?filepath[]="bigbuckbunny_480x272.h265";??

????//SDL---------------------------??

????int?screen_w=0,screen_h=0;??

????SDL_Window?*screen;???

????SDL_Renderer*?sdlRenderer;??

????SDL_Texture*?sdlTexture;??

????SDL_Rect?sdlRect;??

??

????FILE?*fp_yuv;??

??

????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]->codec->codec_type==AVMEDIA_TYPE_VIDEO){??

????????????videoindex=i;??

????????????break;??

????????}??

????if(videoindex==-1){??

????????printf("Didn't?find?a?video?stream.\n");??

????????return?-1;??

????}??

??

????pCodecCtx=pFormatCtx->streams[videoindex]->codec;??

????pCodec=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;??

????}??

??????

????pFrame=av_frame_alloc();??

????pFrameYUV=av_frame_alloc();??

????out_buffer=(unsigned?char?*)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);??

??????

????packet=(AVPacket?*)av_malloc(sizeof(AVPacket));??

????//Output?Info-----------------------------??

????printf("---------------?File?Information?----------------\n");??

????av_dump_format(pFormatCtx,0,filepath,0);??

????printf("-------------------------------------------------\n");??

????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?OUTPUT_YUV420P???

????fp_yuv=fopen("output.yuv","wb+");????

#endif????

??????

????if(SDL_Init(SDL_INIT_VIDEO?|?SDL_INIT_AUDIO?|?SDL_INIT_TIMER))?{????

????????printf(?"Could?not?initialize?SDL?-?%s\n",?SDL_GetError());???

????????return?-1;??

????}???

??

????screen_w?=?pCodecCtx->width;??

????screen_h?=?pCodecCtx->height;??

????//SDL?2.0?Support?for?multiple?windows??

????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;??

??

????//SDL?End----------------------??

????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.\n");??

????????????????return?-1;??

????????????}??

????????????if(got_picture){??

????????????????sws_scale(img_convert_ctx,?(const?unsigned?char*?const*)pFrame->data,?pFrame->linesize,?0,?pCodecCtx->height,???

????????????????????pFrameYUV->data,?pFrameYUV->linesize);??

??????????????????

#if?OUTPUT_YUV420P??

????????????????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---------------------------??

#if?0??

????????????????SDL_UpdateTexture(?sdlTexture,?NULL,?pFrameYUV->data[0],?pFrameYUV->linesize[0]?);????

#else??

????????????????SDL_UpdateYUVTexture(sdlTexture,?&sdlRect,??

????????????????pFrameYUV->data[0],?pFrameYUV->linesize[0],??

????????????????pFrameYUV->data[1],?pFrameYUV->linesize[1],??

????????????????pFrameYUV->data[2],?pFrameYUV->linesize[2]);??

#endif????

??????????????????

????????????????SDL_RenderClear(?sdlRenderer?);????

????????????????SDL_RenderCopy(?sdlRenderer,?sdlTexture,??NULL,?&sdlRect);????

????????????????SDL_RenderPresent(?sdlRenderer?);????

????????????????//SDL?End-----------------------??

????????????????//Delay?40ms??

????????????????SDL_Delay(40);??

????????????}??

????????}??

????????av_free_packet(packet);??

????}??

????//flush?decoder??

????//FIX:?Flush?Frames?remained?in?Codec??

????while?(1)?{??

????????ret?=?avcodec_decode_video2(pCodecCtx,?pFrame,?&got_picture,?packet);??

????????if?(ret?<?0)??

????????????break;??

????????if?(!got_picture)??

????????????break;??

????????sws_scale(img_convert_ctx,?(const?unsigned?char*?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,??NULL,?&sdlRect);????

????????SDL_RenderPresent(?sdlRenderer?);????

????????//SDL?End-----------------------??

????????//Delay?40ms??

????????SDL_Delay(40);??

????}??

??

????sws_freeContext(img_convert_ctx);??

??

#if?OUTPUT_YUV420P???

????fclose(fp_yuv);??

#endif???

??

????SDL_Quit();??

??

????av_frame_free(&pFrameYUV);??

????av_frame_free(&pFrame);??

????avcodec_close(pCodecCtx);??

????avformat_close_input(&pFormatCtx);??

??

????return?0;??

}??

simplest_ffmpeg_player_su（SU版）代碼

標準版的基礎之上引入了SDL的Event。

效果如下：

（1）SDL彈出的窗口可以移動了
（2）畫面顯示是嚴格的40ms一幀

[cpp]?view plaincopy

/**?

?*?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?

?*?

?*?第2版使用SDL2.0取代了第一版中的SDL1.2?

?*?Version?2?use?SDL?2.0?instead?of?SDL?1.2?in?version?1.?

?*?

?*?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.?

?*?

?*?備注:?

?*?標準版在播放視頻的時候，畫面顯示使用延時40ms的方式。這么做有兩個后果：?

?*?（1）SDL彈出的窗口無法移動，一直顯示是忙碌狀態?

?*?（2）畫面顯示并不是嚴格的40ms一幀，因為還沒有考慮解碼的時間。?

?*?SU（SDL?Update）版在視頻解碼的過程中，不再使用延時40ms的方式，而是創建了?

?*?一個線程，每隔40ms發送一個自定義的消息，告知主函數進行解碼顯示。這樣做之后：?

?*?（1）SDL彈出的窗口可以移動了?

?*?（2）畫面顯示是嚴格的40ms一幀?

?*?Remark:?

?*?Standard?Version?use's?SDL_Delay()?to?control?video's?frame?rate,?it?has?2?

?*?disadvantages:?

?*?(1)SDL's?Screen?can't?be?moved?and?always?"Busy".?

?*?(2)Frame?rate?can't?be?accurate?because?it?doesn't?consider?the?time?consumed??

?*?by?avcodec_decode_video2()?

?*?SU（SDL?Update）Version?solved?2?problems?above.?It?create?a?thread?to?send?SDL??

?*?Event?every?40ms?to?tell?the?main?loop?to?decode?and?show?video?frames.?

?*/??

??

#include?<stdio.h>??

??

#define?__STDC_CONSTANT_MACROS??

??

#ifdef?_WIN32??

//Windows??

extern?"C"??

{??

#include?"libavcodec/avcodec.h"??

#include?"libavformat/avformat.h"??

#include?"libswscale/swscale.h"??

#include?"libavutil/imgutils.h"??

#include?"SDL2/SDL.h"??

};??

#else??

//Linux...??

#ifdef?__cplusplus??

extern?"C"??

{??

#endif??

#include?<libavcodec/avcodec.h>??

#include?<libavformat/avformat.h>??

#include?<libswscale/swscale.h>??

#include?<libavutil/imgutils.h>??

#include?<SDL2/SDL.h>??

#ifdef?__cplusplus??

};??

#endif??

#endif??

??

//Refresh?Event??

#define?SFM_REFRESH_EVENT??(SDL_USEREVENT?+?1)??

??

#define?SFM_BREAK_EVENT??(SDL_USEREVENT?+?2)??

??

int?thread_exit=0;??

int?thread_pause=0;??

??

int?sfp_refresh_thread(void?*opaque){??

????thread_exit=0;??

????thread_pause=0;??

??

????while?(!thread_exit)?{??

????????if(!thread_pause){??

????????????SDL_Event?event;??

????????????event.type?=?SFM_REFRESH_EVENT;??

????????????SDL_PushEvent(&event);??

????????}??

????????SDL_Delay(40);??

????}??

????thread_exit=0;??

????thread_pause=0;??

????//Break??

????SDL_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;??

????unsigned?char?*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[]="bigbuckbunny_480x272.h265";??

????char?filepath[]="Titanic.ts";??

??

????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]->codec->codec_type==AVMEDIA_TYPE_VIDEO){??

????????????videoindex=i;??

????????????break;??

????????}??

????if(videoindex==-1){??

????????printf("Didn't?find?a?video?stream.\n");??

????????return?-1;??

????}??

????pCodecCtx=pFormatCtx->streams[videoindex]->codec;??

????pCodec=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;??

????}??

????pFrame=av_frame_alloc();??

????pFrameYUV=av_frame_alloc();??

??

????out_buffer=(unsigned?char?*)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);??

??

????//Output?Info-----------------------------??

????printf("----------------?File?Information?---------------\n");??

????av_dump_format(pFormatCtx,0,filepath,0);??

????printf("-------------------------------------------------\n");??

??????

????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_AUDIO?|?SDL_INIT_TIMER))?{????

????????printf(?"Could?not?initialize?SDL?-?%s\n",?SDL_GetError());???

????????return?-1;??

????}???

????//SDL?2.0?Support?for?multiple?windows??

????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\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?Loop??

??????

????for?(;;)?{??

????????//Wait??

????????SDL_WaitEvent(&event);??

????????if(event.type==SFM_REFRESH_EVENT){??

????????????while(1){??

????????????????if(av_read_frame(pFormatCtx,?packet)<0)??

????????????????????thread_exit=1;??

??

????????????????if(packet->stream_index==videoindex)??

????????????????????break;??

????????????}??

????????????ret?=?avcodec_decode_video2(pCodecCtx,?pFrame,?&got_picture,?packet);??

????????????if(ret?<?0){??

????????????????printf("Decode?Error.\n");??

????????????????return?-1;??

????????????}??

????????????if(got_picture){??

????????????????sws_scale(img_convert_ctx,?(const?unsigned?char*?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_free_packet(packet);??

????????}else?if(event.type==SDL_KEYDOWN){??

????????????//Pause??

????????????if(event.key.keysym.sym==SDLK_SPACE)??

????????????????thread_pause=!thread_pause;??

????????}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;??

}??

運行結果

程序運行后，會在命令行窗口打印一些視頻信息，同時會彈出一個窗口播放視頻內容。

下載

CSDN完整工程下載地址：

http://download.csdn.net/detail/leixiaohua1020/7826277

更新（2014.10.5）==============================

版本升級至2.2。

1.新版本在原版本的基礎上增加了“flush_decoder”功能。當av_read_frame()循環退出的時候，實際上解碼器中可能還包含剩余的幾幀數據。因此需要通過“flush_decoder”將這幾幀數據輸出。“flush_decoder”功能簡而言之即直接調用avcodec_decode_video2()獲得AVFrame，而不再向解碼器傳遞AVPacket。參考代碼如下：

[cpp]?view plaincopy

//FIX:?Flush?Frames?remained?in?Codec??

while?(1)?{??

????ret?=?avcodec_decode_video2(pCodecCtx,?pFrame,?&got_picture,?packet);??

????if?(ret?<?0)??

????????break;??

????if?(!got_picture)??

????????break;??

????sws_scale(img_convert_ctx,?(const?uint8_t*?const*)pFrame->data,?pFrame->linesize,?0,?pCodecCtx->height,?pFrameYUV->data,?pFrameYUV->linesize);??

????//處理...??

}??

2.為了更好地適應Linux等其他操作系統，做到可以跨平臺，去除掉了VC特有的一些函數。比如“#include "stdafx.h"”，“_tmain()”等等。

具體信息參見文章：avcodec_decode_video2()解碼視頻后丟幀的問題解決

2.2版下載地址： http://download.csdn.net/detail/leixiaohua1020/8002337

更新-2.3（2015.1.03）==============================

新增一個工程：最簡單的基于FFmpeg的解碼器-純凈版（不包含libavformat）

2.3版CSDN下載地址： http://download.csdn.net/detail/leixiaohua1020/8322307

更新-2.4（2015.2.13）==============================

這次考慮到了跨平臺的要求，調整了源代碼。經過這次調整之后，源代碼可以在以下平臺編譯通過：

VC++：打開sln文件即可編譯，無需配置。

cl.exe：打開compile_cl.bat即可命令行下使用cl.exe進行編譯，注意可能需要按照VC的安裝路徑調整腳本里面的參數。編譯命令如下。

[plain]?view plaincopy

::VS2010?Environment??

call?"D:\Program?Files\Microsoft?Visual?Studio?10.0\VC\vcvarsall.bat"??

::include??

@set?INCLUDE=include;%INCLUDE%??

::lib??

@set?LIB=lib;%LIB%??

::compile?and?link??

cl?simplest_ffmpeg_player.cpp?/MD?/link?SDL2.lib?SDL2main.lib?avcodec.lib?^??

avformat.lib?avutil.lib?avdevice.lib?avfilter.lib?postproc.lib?swresample.lib?swscale.lib?^??

/SUBSYSTEM:WINDOWS?/OPT:NOREF??

MinGW：MinGW命令行下運行compile_mingw.sh即可使用MinGW的g++進行編譯。編譯命令如下。

[plain]?view plaincopy

g++?simplest_ffmpeg_player.cpp?-g?-o?simplest_ffmpeg_player.exe?\??

-I?/usr/local/include?-L?/usr/local/lib?\??

-lmingw32?-lSDL2main?-lSDL2?-lavformat?-lavcodec?-lavutil?-lswscale??

GCC：Linux或者MacOS命令行下運行compile_gcc.sh即可使用GCC進行編譯。編譯命令如下。

[plain]?view plaincopy

gcc?simplest_ffmpeg_player.cpp?-g?-o?simplest_ffmpeg_player.out?\??

-I?/usr/local/include?-L?/usr/local/lib?-lSDL2main?-lSDL2?-lavformat?-lavcodec?-lavutil?-lswscale??

PS：相關的編譯命令已經保存到了工程文件夾中

CSDN項目下載地址：http://download.csdn.net/detail/leixiaohua1020/8443943 SourceForge、Github等上面已經更新。
更新-2.5（2015.7.17）==============================
增加了下列工程： simplest_ffmpeg_decoder：一個包含了封裝格式處理功能的解碼器。使用了libavcodec和libavformat。simplest_video_play_sdl2：使用SDL2播放YUV的例子。simplest_ffmpeg_helloworld：輸出FFmpeg類庫的信息。
CSDN項目下載地址：http://download.csdn.net/detail/leixiaohua1020/8924321
SourceForge、Github等上面已經更新。

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