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Gradual Decoder Refresh or comparable on DM8168?

Edward Tripp
Prodigy 70 points

Hi,

The H.264 encoder for the DM36x supports gradual decoder refresh.

See:  http://processors.wiki.ti.com/index.php/H.264_DM36x_Ver_2.0_Codec#Gradual_Decoder_Refresh_.28GDR.29

Is there a comparable mode or another method of spreading out the IntraFrame load in the H.264 encoder for the DM8168?

If so, how is it configured?

Thank you.

  • 0
    Prodigy 70 points


    Concerning GRADUAL DECODER REFRESH on 8168, the following provided by email from TI:

    -------------------------------------------------------------------------------
    Few suggestions & sequence to be followed to enable GDR is as follows,

    1. GDR settings @ create time -- Setting static params.

    staticParams->intracodingParams.intraCodingPreset = 1 - User defined
    staticParams->intracodingParams.intraRefreshMethod= 4 - GDR
    staticParams->intracodingParams.intraRefreshRate=  Number of rows gdr'd every frame(for eg : 4)
    staticParams->intracodingParams.gdrOverlapRowsBtwFrames= gdr'd row overlap per frame(less than intraRefreshRate & for eg : 1)

    2. GDR settings @ Dynamic level  -- control call with argument as XDM_SETPARAMS.

    DynamicParams->intracodingParams.intraCodingPreset = 1
    DynamicParams->intracodingParams.intraRefreshMethod= 4
    DynamicParams->intracodingParams.intraRefreshRate=  Number of rows gdr'd every frame(for eg : 4)
    DynamicParams->intracodingParams.gdrOverlapRowsBtwFrames= gdr'd row overlap per frame(less than intraRefreshRate & for eg : 1)
    DynamicParams->intraRefreshRateGDRDynamic =  same as intraRefreshRate
    DynamicParams->gdrOverlapRowsBtwFramesDynamic =  same as gdrOverlapRowsBtwFrames


    3. Enable the GDR by

    IVIDENC2_InArgs::control = IH264ENC_CTRL_START_GDR
    -------------------------------------------------------------------------------

    When static and dynamic parameters are set per steps 1 and 2 in the above recommendations the OMX component hangs going from LOADED to IDLE. 

    For generating IDR frames on the fly we use OMX_IndexconfigVideoIntraVOPRefresh, setting IntraRefreshVOP to OMX_TRUE and calling OMX_SetConfig.  Is there a similar mechanism for IH264ENC_CTRL_START_GDR using OMX? 

    Encoder is ivahd_h264enc_02_00_02_02_production

    OMX is omx_05_02_00_38


    Thank you for your assistance.

     

  • 0 in reply to Edward Tripp
    TI__Intellectual 1290 points

    Team,

    Steps 1 and 2 (in the above post by Edward ) are just used to configure GDR parameters to the encoder.

    Triggering GDR can be done by setting IVIDENC2_InArgs::control = IH264ENC_CTRL_START_GDR. This is done during the process call. The frames encoded onwards this process call will have intra-row(s) as specified in the settings.

    We do have force_skip request to encoder by process call method , IVIDENC2_InArgs::control = IVIDENC2_CTRL_FORCESKIP, 

    So Triggering GDR also goes in the same way.

    Mechanism for GDR and mechanism for IDR frame request are totally different, 

    *) IDR frame request is done by setting videnc2DynamicParams.forceFrame = IVIDEO_IDR_FRAME then followed by XDM_SETPARAMS control call. 

    *) GDR request is done by setting  IVIDENC2_InArgs::control = IH264ENC_CTRL_START_GDR with process call.

    Thank you.