FFMPEG推相机图片到服务器

#include  
#include 
using namespace cv;
using namespace std;


//FFMPEG
extern "C"
{
#include 
#include 
#include 
}
#pragma comment(lib, "swscale.lib")
#pragma comment(lib, "avcodec.lib")
#pragma comment(lib, "avutil.lib")
#pragma comment(lib, "avformat.lib")

int main()
{
    VideoCapture capture(0);
    
    const char *outUrl;
    outUrl = "rtsp://127.0.0.1/isport";
    //注册所有的编解码器
    avcodec_register_all();
    //注册所有的封装器
    av_register_all();
    //注册所有网络协议
    avformat_network_init();
    //像素格式转换上下文
    SwsContext *vsc = NULL;
    //输出的数据结构
    AVFrame *yuv = NULL;
    //编码器上下文
    AVCodecContext *vc = NULL;
    //rtmp flv 封装器
    AVFormatContext *ic = NULL;
    AVOutputFormat *ofmt = NULL;
    int inWidth = 960;
    int inHeight = 540;
    int fps = 60;
    ///2 初始化格式转换上下文
    vsc = sws_getCachedContext(vsc,
        inWidth, inHeight, AV_PIX_FMT_BGR24,     //源宽、高、像素格式
        inWidth, inHeight, AV_PIX_FMT_YUV420P,//目标宽、高、像素格式
        SWS_BICUBIC,  // 尺寸变化使用算法
        0, 0, 0 );
        if (!vsc)
    {
        throw exception("sws_getCachedContext failed!");
    }
    ///3 初始化输出的数据结构
    yuv = av_frame_alloc();
    yuv->format = AV_PIX_FMT_YUV420P;
    yuv->width = inWidth;
    yuv->height = inHeight;
    yuv->pts = 0;
    //分配yuv空间
    int ret = av_frame_get_buffer(yuv, 32);
    if (ret != 0)
    {
        char buf[1024] = { 0 };
        av_strerror(ret, buf, sizeof(buf) - 1);
        throw exception(buf);
    }
    ///4 初始化编码上下文
    //a 找到编码器
    AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_H264);
    if (!codec)
    {
        throw exception("Can`t find h264 encoder!");
    }
    //b 创建编码器上下文
    vc = avcodec_alloc_context3(codec);
    if (!vc)
    {
        throw exception("avcodec_alloc_context3 failed!");
    }
    //c 配置编码器参数
    vc->flags |= AV_CODEC_FLAG_GLOBAL_HEADER; //全局参数
    vc->codec_id = codec->id;
    vc->thread_count = 8;
    vc->bit_rate = 50 * 1024 * 8;//压缩后每秒视频的bit位大小 50kB
    vc->width = inWidth;
    vc->height = inHeight;
    vc->time_base = { 1,fps };
    vc->framerate = { fps,1 };
    //画面组的大小，多少帧一个关键帧
    vc->gop_size = 50;
    vc->max_b_frames = 0;
    vc->pix_fmt = AV_PIX_FMT_YUV420P;
    //d 打开编码器上下文
    ret = avcodec_open2(vc, codec, 0);
    if (ret != 0)
    {
        char buf[1024] = { 0 };
        av_strerror(ret, buf, sizeof(buf) - 1);
        throw exception(buf);
    }
    cout << "avcodec_open2 success!" << endl;
    ///5 输出封装器和视频流配置
    //a 创建输出封装器上下文
    ret = avformat_alloc_output_context2(&ic, NULL, "rtsp", outUrl);
    if (ret != 0)
    {
        char buf[1024] = { 0 };
        av_strerror(ret, buf, sizeof(buf) - 1);
        throw exception(buf);
    }
    ofmt = ic->oformat;
    //b 添加视频流 
    AVStream *vs = avformat_new_stream(ic, codec);
    if (!vs)
    {
        throw exception("avformat_new_stream failed");
    }
    ret = avcodec_parameters_from_context(vs->codecpar, vc);
    av_dump_format(ic, 0, outUrl, 1);
    //打开rtmp 的网络输出IO
    if (!(ofmt->flags & AVFMT_NOFILE))
    {
        ret = avio_open(&ic->pb, outUrl, AVIO_FLAG_WRITE);
        if (ret != 0)
        {
            char buf[1024] = { 0 };
            av_strerror(ret, buf, sizeof(buf) - 1);
            throw exception(buf);
        }
    }
    //写入封装头
    ret = avformat_write_header(ic, NULL);
    if (ret != 0)
    {
        char buf[1024] = { 0 };
        av_strerror(ret, buf, sizeof(buf) - 1);
        throw exception(buf);
    }
    AVPacket pack;
    memset(&pack, 0, sizeof(pack));
    int vpts = 0;
    while (cvGetWindowHandle(plot))
    {
	    Mat color_image;  
	    //定义一个Mat类变量frame，用于存储每一帧的图像 		
	    capture >> color_image;  
	    //读取当前帧 		
	    //若视频完成播放，退出循环		
	    if (color_image.empty())		
	    { 			
	    		break; 		
	    }
	    ///ffmpeg推流部分
       //rgb to yuv
        uint8_t *indata[AV_NUM_DATA_POINTERS] = { 0 };
        indata[0] = color_image.data;
        int insize[AV_NUM_DATA_POINTERS] = { 0 };
        //一行（宽）数据的字节数
        insize[0] = color_image.cols * color_image.elemSize();
        int h = sws_scale(vsc, indata, insize, 0, color_image.rows, //源数据
            yuv->data, yuv->linesize);
        if (h <= 0)
        {
            continue;
        }
        //cout << h << " " << flush;
        ///h264编码
        yuv->pts = vpts;
        vpts++;
        ret = avcodec_send_frame(vc, yuv);
        if (ret != 0)
            continue;
        ret = avcodec_receive_packet(vc, &pack);
        if (ret != 0 || pack.size > 0)
        {
            //cout << "*" << pack.size << flush;
        }
        else
        {
            continue;
        }
        //推流
        pack.pts = av_rescale_q(pack.pts, vc->time_base, vs->time_base);
        pack.dts = av_rescale_q(pack.dts, vc->time_base, vs->time_base);
        pack.duration = av_rescale_q(pack.duration, vc->time_base, vs->time_base);
        ret = av_interleaved_write_frame(ic, &pack);
        if (ret == 0)
        {
            //cout << "#" << flush;
        }
}