When bit-depth scalability is enabled with 1x spatial scalability, SHM-5.0 software does not match the specification of the resampling process in section H.8.1.4 of SHVC working draft 5.

SHVC draft 5 section H.8.1.4 specifies that when the base layer and enhancement layer have the same picture sizes, same internal bit-depths, and zero scaled reference layer offsets, the inter-layer reference picture ilRefPic is set equal to the decoded reference layer picture rlPic.

However in SHM-5.0, when the base layer and enhancement layer have the same picture sizes and zero scaled reference layer offset, the inter-layer reference picture ilRefPic is set equal to the decoded reference layer picture rlPic without checking the bit-depth difference of BL and EL. Consequently, SHM-5.0 does not support bit-depth scalability with 1x scalability in the inter-layer prediction process.

This bug was reported in JCTVC-Q0130, and two implementations of the bug fix are in the software attached in JCTVC-P0130-v2 with the following two macros:

• BIT_DEPTH_AND_1X_SCALABILTY_FIX1
• BIT_DEPTH_AND_1X_SCALABILTY_FIX2

TComDataCU::getBaseColCU() derives iBX and iBY for the reference layer luma sample location. However, it seems to lack the following shifting operations as specified in Eq. (H-51) of Section H.8.1.4.2.1: iBX = (iBX >> 4) << 4; iBY = (iBY >> 4) << 4;

chroma_and_bit_depth_vps_present_flag should not be the first syntax element of rep_format() in TDecCavlc::parseRepFormat(). It should come after pic_height_in_luma_samples as specified in F.7.3.2.1.2.