cplayer/CPlayer/hkc/decode.cpp

void HaiKangHelper::yv12toYuv(const quint8 *yuv420, quint8 *y, quint8 *u, quint8 *v, int width, int height)
{
    //Y分量的长度
    int yLen = width * height;
    //U和V分量的长度
    int uvLen = width / 2 * height / 2;
    //海康的uv是反的需要反过来否则颜色发蓝
    memcpy((quint8 *)y, yuv420, yLen);
    memcpy((quint8 *)v, yuv420 + yLen, uvLen);
    memcpy((quint8 *)u, yuv420 + yLen + uvLen, uvLen);
}

void HaiKangHelper::yv12toYuv(const quint8 *yv12, quint8 *yuv, int width, int height, int widthStep)
{
    int col, row;
    int tmp, idx;
    uint y, u, v;

    for (row = 0; row < height; row++) {
        idx = row * widthStep;
        for (col = 0; col < width; col++) {
            tmp = (row / 2) * (width / 2) + (col / 2);
            y = (uint)yv12[row * width + col];
            u = (uint)yv12[width * height + width * height / 4 + tmp];
            v = (uint)yv12[width * height + tmp];
            yuv[idx + col * 3] = y;
            yuv[idx + col * 3 + 1] = u;
            yuv[idx + col * 3 + 2] = v;
        }
    }
}

void HaiKangHelper::ExceptionCallBack(DWORD dwType, LONG lUserID, LONG lHandle, void *pUser)
{
    //具体类型含义看头文件或者手册即可
    HaiKangThread *thread = (HaiKangThread *)pUser;
    thread->debug("异常回调", "");
    switch (dwType) {
        case EXCEPTION_RECONNECT:
            thread->debug("超时重连", "");
            break;
        default:
            break;
    }
}

void HaiKangHelper::RealDataCallBack(LONG lRealHandle, DWORD dwDataType, BYTE *pBuffer, DWORD dwBufSize, void *pUser)
{
    //每个类都对应自己的port
    HaiKangCallbackData *callbackData = (HaiKangCallbackData *)pUser;
    HaiKangThread *thread = callbackData->thread;
    LONG nPort = thread->port;

    DWORD dRet;
    switch (dwDataType) {
        case NET_DVR_SYSHEAD:
            //获取播放库未使用的通道号
            if (!PlayM4_GetPort(&nPort)) {
                break;
            }

            if (dwBufSize > 0) {
                thread->port = nPort;
                if (!PlayM4_OpenStream(nPort, pBuffer, dwBufSize, 1024 * 1024)) {
                    dRet = PlayM4_GetLastError(nPort);
                    break;
                }

                //设置解码回调函数,只解码不显示
                bool result = PlayM4_SetDecCallBackMend(nPort, DecCallBack, pUser);
                if (!result) {
                    dRet = PlayM4_GetLastError(nPort);
                    break;
                }

                //打开视频解码
                if (!PlayM4_Play(nPort, NULL)) {
                    dRet = PlayM4_GetLastError(nPort);
                    break;
                }

                //打开音频解码,需要码流是复合流
                if (!PlayM4_PlaySound(nPort)) {
                    dRet = PlayM4_GetLastError(nPort);
                    break;
                }
            }
            break;

        case NET_DVR_STREAMDATA:
            //解码数据
            if (dwBufSize > 0 && nPort != -1) {
                BOOL inData = PlayM4_InputData(nPort, pBuffer, dwBufSize);
                while (!inData) {
                    //sleep(10);
                    qApp->processEvents();
                    inData = PlayM4_InputData(nPort, pBuffer, dwBufSize);
                }
            }
            break;
    }
}

void HaiKangHelper::FileEndCallback(LONG nPort, void *pUser)
{
    HaiKangThread *thread = (HaiKangThread *)pUser;
    thread->stop2();
}

//void HaiKangHelper::DecCallBack(LONG nPort, char *pBuf, LONG nSize, FRAME_INFO *pFrameInfo, LONG pUser, LONG nReserved2)
#ifdef Q_OS_WIN
void HaiKangHelper::DecCallBack(LONG nPort, char *pBuf, LONG nSize, FRAME_INFO *pFrameInfo, void *pUser, void *nReserved2)
#else
void HaiKangHelper::DecCallBack(LONG nPort, char *pBuf, LONG nSize, FRAME_INFO *pFrameInfo, void *pUser, LONG nReserved2)
#endif
{
    HaiKangCallbackData *callbackData = (HaiKangCallbackData *)pUser;
    HaiKangThread *thread = callbackData->thread;
    if (thread->getIsPause()) {
        return;
    }

    quint8 *data = (quint8 *)pBuf;
    long frameType = pFrameInfo->nType;
    //编码时产生的图像帧率(如果是音频数据则为采样率)
    long frameRate = pFrameInfo->nFrameRate;

    //视频数据是 T_YV12 音频数据是 T_AUDIO16
    if (frameType == T_YV12) {
        long width = pFrameInfo->nWidth;
        long height = pFrameInfo->nHeight;
        //识别尺寸发生变化
        thread->checkVideoSize(width, height);
        //thread->debug("回调视频", QString("宽高: %1x%2").arg(width).arg(height));

        //如果处于截图标志位则立即将图片保存
        if (thread->getIsSnap()) {
            QImage image(width, height, QImage::Format_RGB888);
            yv12ToRgb888(data, image.bits(), width, height);
            image.save(thread->getSnapName(), "jpg");
            QMetaObject::invokeMethod(thread, "snapFinsh");
        }

        //如果是绘制则转成图片否则转成yuv用opengl绘制
        if (thread->getVideoMode() == VideoMode_Opengl) {
            yv12toYuv(data, callbackData->dataY, callbackData->dataU, callbackData->dataV, width, height);
            thread->setYuv(width, height, callbackData->dataY, callbackData->dataU, callbackData->dataV);
        } else {
            QImage image(width, height, QImage::Format_RGB888);
            yv12ToRgb888(data, image.bits(), width, height);
            thread->setImage(image);
        }
    } else if (frameType == T_AUDIO16) {
        //thread->debug("回调音频", QString("采样: %1").arg(frameRate));
    }
}