SD平台，由于内存限制，解码HD节目将出现内存崩溃的问题。
要解决该问题，应该在解码前判断出HD节目，阻止解码过程，并且通知上层应用以便提示用户该节目为高清节目，不能解码。
方法如下，请注意红色修改部分：
1. in phStbAV_callbacks.c function phStbAv_OnNewSequenceFound()
    … … …
    status = tmdlMsvdGetSequenceInfo (pInstance->msvdInstance,
                                      &seqInfo );
    if (status == TM_OK)
    {
        /* If new seq header then see if we have to deal with the changes or not.*/
        if((seqInfo.seqHeight != pInstance->seqInfo.seqHeight) ||
           (seqInfo.seqWidth != pInstance->seqInfo.seqWidth) ||
           (seqInfo.aspectRatio != pInstance->seqInfo.aspectRatio) ||
           (seqInfo.pictureRate != pInstance->seqInfo.pictureRate) ||
           (seqInfo.tvStandard != pInstance->seqInfo.tvStandard)
#ifndef CONFIG_HDDECODE_ENABLE
  ||((seqInfo.seqHeight > 576) || (seqInfo.seqWidth > 720))
            /* Force seqInfo change to inform the application that this format is not supported */
#endif
        )
        {
            … …
            //通知视频流变化信息
            /* seqInfo has changed.*/
            *pUpdated = true;
        }
    }

2. 应用程序的处理
应用程序在得到DVPET_STREAMCHANGE事件后，停止音视频并且提示用户不能解码。在我们DVB-T的参考代码中，处理方法如下：
文件DirectFBManager.cpp函数DirectFBManager_eventThread()
static void DirectFBManager_eventThread(void *pArg)
             … … …
                        case DVPET_STREAMCHANGE:

                                    /* Report that video has not started */
                                    video_handle[MAIN_VIDEO_DEVICE].callback_func(video_handle[MAIN_VIDEO_DEVICE].callback_user_data,
                                                                                 
                                    /* Notify the playback thread, check will be made inside the function */
                                    PlaybackThread_notifyVideoStarted();
                                }
                                if (eventsInfo.videoprovider.data_type == DVPEDST_AUDIO)
                                {
                                    /* Report that audio has just started */
                                    audio_handle[MAIN_VIDEO_DEVICE].callback_func(audio_handle[MAIN_VIDEO_DEVICE].callback_user_data);
                               
                                    /* Notify the playback thread, check will be made inside the function */
                                    PlaybackThread_notifyAudioStarted();
                                }
                            }
#endif
  … … …
callback_func()的处理参考见最后。

 

A. in phddMsvd2Lisr.c, 函数sf_Msvd2Lisr_ProcessEOPH()处理Msvd中断事件时。如果发现不支持高清解码，则调用相应处理过程。
    … … …
    /* Check Resolution */
    eResError = phddMsvd2_Lctx_CheckHDEnable(
         tPictureEventData.tPictureDisplay.usDispHor,
         tPictureEventData.tPictureDisplay.usDispVer ); //判断是否为高清节目而高清解码是否打开

    if( eResError == phddMsvd2_Ldec_ErrorNotSupported )
    {
        /* Can not decode a HD stream with a SD firmware */

        /* change state */
        gphddMsvd2_Lctx.tDec[ulHandle].eDecState = phddMsvd2_Ldec_StateError;
        gphddMsvd2_Lctx.tDec[ulHandle].eDecSubState = phddMsvd2_Lctx_SubStateNo;

        /* send back fatal error */
        tEventData = phddMsvd2_Ldec_ErrorFatalFormatNotSupported;

        gphddMsvd2_Lctx.tDec[ulHandle].pfCallback(
                ulHandle,
                PHDD_MSVD2LDEC_EVENT_FATAL_ERROR,
                (phddMsvd2_Ldec_EventData_t*)&tEventData );
    }

 

B. 文件tmdlMsvdPrivate.c函数tmdlMsvd_DEC_callback()处理该事件，并通知相应MSVD任务处理，处理如下：
                        case phddMsvd2_Hdec_ErrorFatalFormatNotSupported:
                            {
                                /* Send an event to the monitor task. */
                                (void)tmdlMsvdPrivate_SendMessage(
                                        tmdlMsvd_MessageType_Stop,
                                        msvdInstance,
                                        0, NULL);
                            }
                            break;

 

C. 文件tmdlMsvdPrivate.c函数MsvdPrivate_MonitorTask()
该任务得到tmdlMsvd_MessageType_Stop后，停止Msvd解码
            case tmdlMsvd_MessageType_Stop:
                MsvdPrivate_Stop(msg.instance);
                break;

 

注：我们的客户再处理此类问题时，并不需要涉及到底层部分的修改，只要参考第二节提到的应用程序部分的处理即可。尽管底层进行了自我保护，如果应用程序不停掉音视频，以便下次重启该过程，解码过程将无法恢复。