ffmpeg解码数据保存为yuv格式

将ffmpeg解码的数据保存为yuv格式：

    Q_UNUSED(width);

    Q_UNUSED(height);

    BroadCastManager *ptr = (BroadCastManager *)receiver;

    int frame_finished;

    memset(&ptr->client_info.packet,0,sizeof(ptr->client_info.packet));

    ptr->client_info.packet.data=pData;

    ptr->client_info.packet.size=size;

    unsigned int consumed_bytes = avcodec_decode_video2(ptr->client_info.pCodecCtx,ptr->client_info.pFrame,&frame_finished,&ptr->client_info.packet);

    unsigned char *DisplayBuf;

    DisplayBuf = (unsigned char *)malloc(sizeof(unsigned char)*(3 * (ptr->client_info.width) * (ptr->client_info.height)));

    if(DisplayBuf == NULL)

    {

        qInfo() << "the displaybuf is null";

        return NULL;

    }

    if(consumed_bytes > 0)

    {

        memset(DisplayBuf,0,3 *(ptr->client_info.width) * (ptr->client_info.height));

        int p=0;

        for(int i=0; i<ptr->client_info.height; i++)

        {

            memcpy(DisplayBuf+p,ptr->client_info.pFrame->data[0] + i * ptr->client_info.pFrame->linesize[0], ptr->client_info.width);

            p += ptr->client_info.width;

        }

        for(int i=0; i<ptr->client_info.height/2; i++)

        {

            memcpy(DisplayBuf+p,ptr->client_info.pFrame->data[1] + i * ptr->client_info.pFrame->linesize[1], ptr->client_info.width/2);

            p+=ptr->client_info.width/2;

        }

        for(int i=0; i<ptr->client_info.height/2; i++)

        {

             memcpy(DisplayBuf+p,ptr->client_info.pFrame->data[2] + i * ptr->client_info.pFrame->linesize[2], ptr->client_info.width/2);

             p+=ptr->client_info.width/2;

        }

        return DisplayBuf;

     }