最简单的基于ffmpeg+SDL的视频播放器

来源：互联网发布：正版办公软件要买吗编辑：程序博客网时间：2024/04/27 10:25

环境：

ubuntu 12.04
Qt 5.5.0
ffmpeg 3.0.1
SDL 2.1

流程图

该播放器解码的流程用图的方式可以表示称如下形式：
流程图1

SDL显示YUV图像的流程图：
流程图2

simplest_ffmpeg_player（标准版）代码：

/** * 最简单的基于FFmpeg的视频播放器 * Simplest FFmpeg Player * * 雷霄骅 Lei Xiaohua * leixiaohua1020@126.com * 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的解码和显示（支持HEVC，H.264，MPEG2等）。 * 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 video player based on FFmpeg. * Suitable for beginner of FFmpeg. */#include <stdio.h>#define __STDC_CONSTANT_MACROS#ifdef _WIN32//Windowsextern "C"{#include "libavcodec/avcodec.h"#include "libavformat/avformat.h"#include "libswscale/swscale.h"#include "SDL/SDL.h"};#else//Linux...#ifdef __cplusplusextern "C"{#endif#include <libavcodec/avcodec.h>#include <libavformat/avformat.h>#include <libswscale/swscale.h>#include <SDL/SDL.h>#ifdef __cplusplus};#endif#endif//Full Screen#define SHOW_FULLSCREEN 0//Output YUV420P#define OUTPUT_YUV420P 0int main(int argc, char* argv[]){    //FFmpeg    AVFormatContext *pFormatCtx;    int             i, videoindex;    AVCodecContext  *pCodecCtx;    AVCodec         *pCodec;    AVFrame *pFrame,*pFrameYUV;    AVPacket *packet;    struct SwsContext *img_convert_ctx;    //SDL    int screen_w,screen_h;    SDL_Surface *screen;    SDL_VideoInfo *vi;    SDL_Overlay *bmp;    SDL_Rect rect;    FILE *fp_yuv;    int ret, got_picture;    char filepath[]="test.mkv";    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();    //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----------------------------    if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {        printf( "Could not initialize SDL - %s\n", SDL_GetError());        return -1;    }#if SHOW_FULLSCREEN    vi = SDL_GetVideoInfo();    screen_w = vi->current_w;    screen_h = vi->current_h;    screen = SDL_SetVideoMode(screen_w, screen_h, 0,SDL_FULLSCREEN);#else    screen_w = pCodecCtx->width;    screen_h = pCodecCtx->height;    screen = SDL_SetVideoMode(screen_w, screen_h, 0,0);#endif    if(!screen) {        printf("SDL: could not set video mode - exiting:%s\n",SDL_GetError());        return -1;    }    bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,SDL_YV12_OVERLAY, screen);    rect.x = 0;    rect.y = 0;    rect.w = screen_w;    rect.h = screen_h;    //SDL End------------------------    packet=(AVPacket *)av_malloc(sizeof(AVPacket));    //Output Information-----------------------------    printf("------------- File Information ------------------\n");    av_dump_format(pFormatCtx,0,filepath,0);    printf("-------------------------------------------------\n");#if OUTPUT_YUV420P    fp_yuv=fopen("output.yuv","wb+");#endif    SDL_WM_SetCaption("Simplest FFmpeg Player",NULL);    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){            //Decode            ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);            if(ret < 0){                printf("Decode Error.\n");                return -1;            }            if(got_picture){                SDL_LockYUVOverlay(bmp);                pFrameYUV->data[0]=bmp->pixels[0];                pFrameYUV->data[1]=bmp->pixels[2];                pFrameYUV->data[2]=bmp->pixels[1];                pFrameYUV->linesize[0]=bmp->pitches[0];                pFrameYUV->linesize[1]=bmp->pitches[2];                pFrameYUV->linesize[2]=bmp->pitches[1];                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_UnlockYUVOverlay(bmp);                SDL_DisplayYUVOverlay(bmp, &rect);                //Delay 40ms                SDL_Delay(40);            }        }        av_free_packet(packet);    }    //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);        SDL_LockYUVOverlay(bmp);        pFrameYUV->data[0]=bmp->pixels[0];        pFrameYUV->data[1]=bmp->pixels[2];        pFrameYUV->data[2]=bmp->pixels[1];        pFrameYUV->linesize[0]=bmp->pitches[0];        pFrameYUV->linesize[1]=bmp->pitches[2];        pFrameYUV->linesize[2]=bmp->pitches[1];#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_UnlockYUVOverlay(bmp);        SDL_DisplayYUVOverlay(bmp, &rect);        //Delay 40ms        SDL_Delay(40);    }    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 0;}

.pro文件如下：

TEMPLATE = appCONFIG += consoleCONFIG -= app_bundleCONFIG -= qtSOURCES += main.cppinclude(deployment.pri)qtcAddDeployment()LIBS += -lSDL \        -lavcodec \        -lavdevice \        -lavfilter \        -lavformat \        -lswresample \        -lavutil \        -lswscale

编译运行即可。

运行结果

运行结果如下：
结果1
结果2
ps：本文转载自雷霄骅大神的博客（http://blog.csdn.net/leixiaohua1020）的博文，由于使用的平台不同和ffmpeg版本不同，故稍加修改。

本文出处：

http://blog.csdn.net/leixiaohua1020/article/details/8652605

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