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最简单的基于FFmpeg的视频播放器系列文章列表:
100行代码实现最简单的基于FFMPEG+SDL的视频播放器(SDL1.x)
最简单的基于FFMPEG+SDL的视频播放器 ver2 (采用SDL2.0)
最简单的基于FFmpeg的解码器-纯净版(不包含libavformat)
最简单的基于FFMPEG+SDL的视频播放器:拆分-解码器和播放器
最简单的基于FFMPEG的Helloworld程序
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本文补充记录《最简单的基于FFMPEG+SDL的视频播放器》中的两个例子:FFmpeg视频解码器和SDL像素数据播放器。这两个部分是从视频播放器中拆分出来的两个例子。FFmpeg视频解码器实现了视频数据到YUV数据的解码,而SDL像素数据播放器实现了YUV数据的显示。简而言之,原先的FFmpeg+SDL视频播放器实现了:
视频数据->YUV->显示器
FFmpeg视频解码器实现了:
视频数据->YUV
SDL像素数据播放器实现了:
/** * 最简单的基于FFmpeg的视频解码器 * Simplest FFmpeg Decoder * * 雷霄骅 Lei Xiaohua * [email protected] * 中国传媒大学/数字电视技术 * Communication University of China / Digital TV Technology * http://blog.csdn.net/leixiaohua1020 * * * 本程序实现了视频文件解码为YUV数据。它使用了libavcodec和 * libavformat。是最简单的FFmpeg视频解码方面的教程。 * 通过学习本例子可以了解FFmpeg的解码流程。 * This software is a simplest decoder based on FFmpeg. * It decodes video to YUV pixel data. * It uses libavcodec and libavformat. * Suitable for beginner of FFmpeg. * */#include #define __STDC_CONSTANT_MACROS#ifdef _WIN32//Windowsextern "C"{#include "libavcodec/avcodec.h"#include "libavformat/avformat.h"#include "libswscale/swscale.h"#include "libavutil/imgutils.h"};#else//Linux...#ifdef __cplusplusextern "C"{#endif#include #include #include #include #ifdef __cplusplus};#endif#endifint 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[]="Titanic.mkv"; FILE *fp_yuv=fopen("output.yuv","wb+"); 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; inb_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); 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); 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 printf("Succeed to decode 1 frame!\n"); } } 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); 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 printf("Flush Decoder: Succeed to decode 1 frame!\n"); } sws_freeContext(img_convert_ctx); fclose(fp_yuv); av_frame_free(&pFrameYUV); av_frame_free(&pFrame); avcodec_close(pCodecCtx); avformat_close_input(&pFormatCtx); return 0;}
/** * 最简单的SDL2播放视频的例子(SDL2播放RGB/YUV) * Simplest Video Play SDL2 (SDL2 play RGB/YUV) * * 雷霄骅 Lei Xiaohua * [email protected] * 中国传媒大学/数字电视技术 * Communication University of China / Digital TV Technology * http://blog.csdn.net/leixiaohua1020 * * 本程序使用SDL2播放RGB/YUV视频像素数据。SDL实际上是对底层绘图 * API(Direct3D,OpenGL)的封装,使用起来明显简单于直接调用底层 * API。 * * 函数调用步骤如下: * * [初始化] * SDL_Init(): 初始化SDL。 * SDL_CreateWindow(): 创建窗口(Window)。 * SDL_CreateRenderer(): 基于窗口创建渲染器(Render)。 * SDL_CreateTexture(): 创建纹理(Texture)。 * * [循环渲染数据] * SDL_UpdateTexture(): 设置纹理的数据。 * SDL_RenderCopy(): 纹理复制给渲染器。 * SDL_RenderPresent(): 显示。 * * This software plays RGB/YUV raw video data using SDL2. * SDL is a wrapper of low-level API (Direct3D, OpenGL). * Use SDL is much easier than directly call these low-level API. * * The process is shown as follows: * * [Init] * SDL_Init(): Init SDL. * SDL_CreateWindow(): Create a Window. * SDL_CreateRenderer(): Create a Render. * SDL_CreateTexture(): Create a Texture. * * [Loop to Render data] * SDL_UpdateTexture(): Set Texture's data. * SDL_RenderCopy(): Copy Texture to Render. * SDL_RenderPresent(): Show. */#include extern "C"{#include "sdl/SDL.h"};const int bpp=12;int screen_w=500,screen_h=500;const int pixel_w=320,pixel_h=180;unsigned char buffer[pixel_w*pixel_h*bpp/8];//Refresh Event#define REFRESH_EVENT (SDL_USEREVENT + 1)#define BREAK_EVENT (SDL_USEREVENT + 2)int thread_exit=0;int refresh_video(void *opaque){ thread_exit=0; while (!thread_exit) { SDL_Event event; event.type = REFRESH_EVENT; SDL_PushEvent(&event); SDL_Delay(40); } thread_exit=0; //Break SDL_Event event; event.type = BREAK_EVENT; SDL_PushEvent(&event); return 0;}int main(int argc, char* argv[]){ if(SDL_Init(SDL_INIT_VIDEO)) { printf( "Could not initialize SDL - %s\n", SDL_GetError()); return -1; } SDL_Window *screen; //SDL 2.0 Support for multiple windows screen = SDL_CreateWindow("Simplest Video Play SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, screen_w, screen_h,SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE); if(!screen) { printf("SDL: could not create window - exiting:%s\n",SDL_GetError()); return -1; } SDL_Renderer* sdlRenderer = SDL_CreateRenderer(screen, -1, 0); Uint32 pixformat=0; //IYUV: Y + U + V (3 planes) //YV12: Y + V + U (3 planes) pixformat= SDL_PIXELFORMAT_IYUV; SDL_Texture* sdlTexture = SDL_CreateTexture(sdlRenderer,pixformat, SDL_TEXTUREACCESS_STREAMING,pixel_w,pixel_h); FILE *fp=NULL; fp=fopen("test_yuv420p_320x180.yuv","rb+"); if(fp==NULL){ printf("cannot open this file\n"); return -1; } SDL_Rect sdlRect; SDL_Thread *refresh_thread = SDL_CreateThread(refresh_video,NULL,NULL); SDL_Event event; while(1){ //Wait SDL_WaitEvent(&event); if(event.type==REFRESH_EVENT){ if (fread(buffer, 1, pixel_w*pixel_h*bpp/8, fp) != pixel_w*pixel_h*bpp/8){ // Loop fseek(fp, 0, SEEK_SET); fread(buffer, 1, pixel_w*pixel_h*bpp/8, fp); } SDL_UpdateTexture( sdlTexture, NULL, buffer, pixel_w); //FIX: If window is resize sdlRect.x = 0; sdlRect.y = 0; sdlRect.w = screen_w; sdlRect.h = screen_h; SDL_RenderClear( sdlRenderer ); SDL_RenderCopy( sdlRenderer, sdlTexture, NULL, &sdlRect); SDL_RenderPresent( sdlRenderer ); }else if(event.type==SDL_WINDOWEVENT){ //If Resize SDL_GetWindowSize(screen,&screen_w,&screen_h); }else if(event.type==SDL_QUIT){ thread_exit=1; }else if(event.type==BREAK_EVENT){ break; } } SDL_Quit(); return 0;}
项目主页
SourceForge: https://sourceforge.net/projects/simplestffmpegplayer/Github:https://github.com/leixiaohua1020/simplest_ffmpeg_player
开源中国:http://git.oschina.net/leixiaohua1020/simplest_ffmpeg_player
CSDN下载地址:http://download.csdn.net/detail/leixiaohua1020/8924321
simplest_ffmpeg_player:标准版,FFmpeg学习的开始。
simplest_ffmpeg_player_su:SU(SDL Update)版,加入了简单的SDL的Event。
simplest_ffmpeg_decoder:一个包含了封装格式处理功能的解码器。使用了libavcodec和libavformat。
simplest_ffmpeg_decoder_pure:一个纯净的解码器。只使用libavcodec(没有使用libavformat)。
simplest_video_play_sdl2:使用SDL2播放YUV的例子。
simplest_ffmpeg_helloworld:输出FFmpeg类库的信息。
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