On Sun, Mar 07, 2010 at 04:19:07PM -0800, Tommy Thorn wrote:
> I'm having trouble decoding the sample BBC streams, for example,
> sage-640x360.mov. It appears that my spec based decoder diverges from
> dirac-research and Schroedinger on codeblock quantiser offset. Both specs
> (Dirac 13.4.3.4) clearly states that if state[CODEBLOCK MODE] != 0 implies
> that the quantifier offset is read from the stream.
>
> However Schroedinger and dirac-research does something more complicated
> here. Schroedinger 1.0.8 has
>
> if (params->codeblock_mode_index == 1) {
> ctx->have_quant_offset = TRUE;
> if (picture->decoder_instance->compat_quant_offset &&
> ctx->horiz_codeblocks == 1 && ctx->vert_codeblocks == 1) {
> ctx->have_quant_offset = FALSE;
> }
> } else {
> ctx->have_quant_offset = FALSE;
> }
See:
http://diracvideo.org/git?p=schroedinger.git;a=commit;h=8282908e54f0805843ad9842b774129f9609c6f0
dave...
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