• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 99 subscribers
  • Views 3093 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

IVAHD H.264 Encoder VUI parameters support

Anfernee Chang
Intellectual 1015 points

Hi Champs,

Codec: REL.500.V.H264AVC.E.IVAHD.02.00.04.01

According to the userguide and source code, The supported VUI coding params as below.

typedef struct IH264ENC_VUICodingParams {
  XDAS_Int8                  vuiCodingPreset            ;
  XDAS_UInt8                 aspectRatioInfoPresentFlag ;
  XDAS_UInt8                 aspectRatioIdc             ;
  XDAS_UInt8                 videoSignalTypePresentFlag ;
  XDAS_UInt8                 videoFormat                ;
  XDAS_UInt8                 videoFullRangeFlag         ;
  XDAS_UInt8                 timingInfoPresentFlag      ;
  XDAS_UInt8                 hrdParamsPresentFlag       ;
  XDAS_UInt32                numUnitsInTicks            ;

 } IH264ENC_VUICodingParams ;

 

The question is that is it possible cusotmer can add the VUI parameters as H.264 SPEC below? Otherwise, what is the setting of these parameters in the encoder.

bitstream_restriction_flag = 1

if( bitstream_restriction_flag ) {
motion_vectors_over_pic_boundaries_flag
max_bytes_per_pic_denom
max_bits_per_mb_denom
log2_max_mv_length_horizontal
log2_max_mv_length_vertical
max_num_reorder_frames
max_dec_frame_buffering
}

 

Regards,

Anfernee

  • 0
    TI__Intellectual 840 points

    Hi Anfernee,

    We always code bitstream_restriction_flag as 0. So the parameters falling under this group(bit restriction flag enable case) are not required to be coded and hence not exposed to user.

    More Information:  

    No bit-stream restriction are present. These restrictions are conveyed in the bit-stream to simplify decoder design to exploit these infos, like UMV ON/OFF 

    put_bits_h264(writer, 1, BITSTREAM_RESTRICTION_FLAG_FALSE) /* for bitstream_restriction_flag  */

     

    Thanks,

    Santosh

  • 0 in reply to Santosh Kumar Kandagave
    TI__Intellectual 1015 points

    Hi Santosh,

     

    Thanks for the clarification.

     

    Regards,

    Anfernee

  • 0 in reply to Santosh Kumar Kandagave
    Expert 2640 points

    Dear Santosh,

    I want to make bitstream_restriction_parameters for reducing decoding delay.

    Is it possible?

    I want make bitstream_restriction_parameters by myself.

    So, I want know, what values are applied each parameters.

     

    For example,

    sps->vui_seq_parameters.motion_vectors_over_pic_boundaries_flag

      is 0

     

    sps->vui_seq_parameters.log2_max_mv_length_horizontal

      is 4 pels

    sps->vui_seq_parameters.log2_max_mv_length_vertical

      is 4 lines

    sps->vui_seq_parameters.num_reorder_frames

      is 1 frame in IP only encode

    sps->vui_seq_parameters.max_dec_frame_buffering

      is some byte in IP only encode

    thx ~

    HB