sdl win 播放video hello--

#include <stdio.h>
#include <stdlib.h>
extern "C"
{
#include <SDL.h>
    #include "libavutil/opt.h"
    #include "libavutil/channel_layout.h"
    #include "libavutil/common.h"
    #include "libavutil/imgutils.h"
    #include "libavutil/mathematics.h"
    #include "libavutil/samplefmt.h"
    #include "libavutil/time.h"
    #include "libavutil/fifo.h"
    #include "libavcodec/avcodec.h"
    #include "libavformat/avformat.h"
    #include "libavformat/avio.h"
    #include "libavfilter/avfiltergraph.h"
    #include "libavfilter/avfilter.h"
    #include "libavfilter/buffersink.h"
    #include "libavfilter/buffersrc.h"
    #include "libswscale/swscale.h"
    #include "libswresample/swresample.h"
}
#include <memory>
#include <windows.h>
#include "sdlplayer.h"

int mymain();


int _tmain(int argc, _TCHAR* argv[]){
    mymain();
    return 0;
}



AVInputFormat mFormat;
AVDictionary* iformat_opts;
using namespace std;
#define INBUF_SIZE 4096

void Init()
{
    av_register_all();
    avfilter_register_all();
    avformat_network_init();
    av_log_set_level(AV_LOG_ERROR);
}
AVFormatContext *ic = NULL;
int64_t lastReadPacktTime ;
std::shared_ptr <AVPacket> readPacketFromSource()
{
    std::shared_ptr<AVPacket> packet(static_cast<AVPacket*>(av_malloc(sizeof(AVPacket))), [&](AVPacket *p) { av_packet_free(&p); av_freep(&p);});
    av_init_packet(packet.get());
    lastReadPacktTime = av_gettime();
    int ret = av_read_frame(ic, packet.get());
    if(ret >= 0)
    {
        return packet;
    }
    else
    {
        return nullptr;
    }

}    
bool videoDecode(AVPacket* packet, AVFrame *frame)
{
    int gotFrame = 0;
    //videoIndex
    auto hr = avcodec_decode_video2(ic->streams[0]->codec, frame, &gotFrame, packet);
    if (hr >= 0 && gotFrame != 0)
    {
        return true;
    }
    return false;
}

int initVideoDecodeContext()
{    
    auto codecId = ic->streams[0]->codec->codec_id;
    auto codec = avcodec_find_decoder(codecId);
    if (!codec)
    {
        return -1;
    }

    int ret = avcodec_open2(ic->streams[0]->codec, codec, NULL);
    return ret;

}



static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize,
                     char *filename)
{
    FILE *f;
    int i;

    f = fopen(filename,"w");
    fprintf(f, "P5
%d %d
%d
", xsize, ysize, 255);
    for (i = 0; i < ysize; i++)
        fwrite(buf + i * wrap, 1, xsize, f);
    fclose(f);
}

int mymain()
{
    int scan_all_pmts_set = 0;
    /* register all codecs, demux and protocols */
    Init();
    ic = avformat_alloc_context();
    int ret;
    if (!ic) {
        av_log(NULL, AV_LOG_FATAL, "Could not allocate context.
");
        ret = AVERROR(ENOMEM);
        printf("alloc err %d
",ret);

    }
    /*
    if (!av_dict_get(iformat_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE)) {
        av_dict_set(&iformat_opts, "scan_all_pmts", "1", AV_DICT_DONT_OVERWRITE);
        scan_all_pmts_set = 1;
    }
    */
    int err = avformat_open_input(&ic, "F://3s.mp4", nullptr, nullptr);
    if (err < 0) {
        printf("open err err=%d
",err);
    }
    printf("come 2
");

    /*
    err = avformat_find_stream_info(ic, nullptr);

    printf("ic->nb_streams %d
",ic->nb_streams);
    if(err<0){
    }else{
        for(int i=0;i<ic->nb_streams;i++){

            int type =  ic->streams[i]->codec->codec_type;
            printf("type = %d
",type);
        }                                        

    }*/
    int ret1 =initVideoDecodeContext();
    printf("ret1 = %d
",ret1);
    std::shared_ptr<CGSDLRender> sdlRender =std::make_shared<CGSDLRender>();//???????
    ret = initVideoDecodeContext();
    if(ret < 0) return ret;
    sdlRender->InitVideo(0);
    sdlRender->CreateVideoSurface(ic->streams[0]->codec->width, ic->streams[0]->codec->height);
    //
    AVFrame * videoFrame = av_frame_alloc();

    for(int i=0;i<10000;i++){
        auto packet = readPacketFromSource();
        if(packet){
            if(packet->stream_index==0)
                if(videoDecode(packet.get(),videoFrame))
                {
                    //playVideo(videoFrame);
                    int j=0;
                    j++;
                    printf("%d---
",i);
                    char buf[1024];
                    sprintf(buf,  "%s-%d", "3smp4", i);
                    AVFrame * frame = videoFrame;
                    sdlRender->Display((char**)frame->data,frame->linesize);
                    Sleep(30);
                    //pgm_save(frame->data[0], frame->linesize[0],
                    //    frame->width, frame->height, buf);
                }
        }
        else{
            break;
        }
    }
    av_frame_free(&videoFrame);
    return 0;
}

sdl 部分.h

class CGSDLRender 
{
public:
    CGSDLRender();
    virtual ~CGSDLRender(void);
        
    int InitVideo( int adapterId = 0);

    int CreateVideoSurface(int width, int height);
    int Display(char** data, int* linesize);
        
private:

    SDL_Window *sdlWindow;
    SDL_Renderer *sdlRender;
    SDL_Texture *sdlTexture;

    int width;
    int height;

private:
    
};

实现

#include <SDL.h>
#include <windows.h>
#include "sdlplayer.h"
CGSDLRender::~CGSDLRender()
{

}
CGSDLRender::CGSDLRender()
{

}

int CGSDLRender::InitVideo( int adapterId)
{
    SDL_Init(SDL_INIT_VIDEO);
    sdlWindow = SDL_CreateWindow(("窗口标题"),300,300,300,300,SDL_WINDOW_SHOWN);
    sdlRender = SDL_CreateRenderer(sdlWindow, -1, SDL_RendererFlags::SDL_RENDERER_ACCELERATED);
    return S_OK;
}

int CGSDLRender::CreateVideoSurface(int width, int height)
{
    this->width = width;
    this->height = height;
    sdlTexture = SDL_CreateTexture(sdlRender, SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING, width, height);
    return S_OK;
}

int CGSDLRender::Display(char** data, int* linesize)
{
    void* piexels = nullptr;
    int pitch;

    int ret = SDL_LockTexture(sdlTexture, NULL, &piexels, &pitch);
    if(ret < 0) return ret;
    uint8_t*    yuv[3] = { 
        (uint8_t*)piexels,(uint8_t*)piexels + pitch * height,
        (uint8_t*)piexels + pitch * height + ((pitch >> 1) * (height >> 1))
    };

    for (int i = 0; i < height; i++)
    {
        memcpy(yuv[0] + i * pitch, data[0] + i * linesize[0], linesize[0]);
        if (i % 2 == 0)
        {
            memcpy(yuv[1] + (i >> 1) * (pitch >> 1), data[2] + (i >> 1) * linesize[2], linesize[2]);
            memcpy(yuv[2] + (i >> 1) * (pitch >> 1), data[1] + (i >> 1) * linesize[1], linesize[1]);
        }
    }


    SDL_UnlockTexture(sdlTexture);
    SDL_RenderClear(sdlRender);
    SDL_RenderCopy(sdlRender, sdlTexture, NULL, NULL);
    SDL_RenderPresent(sdlRender);
    return S_OK;
}

附加依赖项:avcodec.lib
avformat.lib
avfilter.lib
avutil.lib
swresample.lib
swscale.lib
winmm.lib
Gdi32.lib
dsound.lib
SDL2.lib
SDL2main.lib
dxguid.lib