[Ffmpeg-devel] h264.c: code works different to ISO 14496-10:2004 documentation

[Måns Rullgård]

Reinhard Nissl <rnissl at gmx.de> writes:

> Hi,
>
> the code in question is in decode_seq_parameter_set():
>
>     if(sps->profile_idc >= 100){ //high profile
>         if(get_ue_golomb(&s->gb) == 3) //chroma_format_idc
>             get_bits1(&s->gb);  //residual_color_transform_flag
>         get_ue_golomb(&s->gb);  //bit_depth_luma_minus8
>         get_ue_golomb(&s->gb);  //bit_depth_chroma_minus8
>         sps->transform_bypass = get_bits1(&s->gb);
>         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4,
> sps->scaling_matrix8);
>     }else
>         sps->scaling_matrix_present = 0;
>
> I do not find any documentation about this fragment in the above
> mentioned specification. Are these 5 data members documented in the
> release of 2005?
>
> I don't want to buy the new release just to see that those members are
> still missing.

I have a document titled "ITU-T Rec. H.264 (03/2005) - Prepublished
version", wherein those fields are defined.

The spec is available for free from ITU.  There's no need to pay ISO
for it.

-- 
M?ns Rullg?rd
mans at mansr.com