View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000015 | JVT JM H.264/AVC reference software | decoder | public | 2006-09-20 12:55 | 2008-07-24 16:37 |
| Reporter | Ramandeep Sandhu | Assigned To | Alexis Michael Tourapis | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Product Version | JM 10.2 | ||||
| Fixed in Version | JM-14.1 | ||||
| Summary | 0000015: Chroma transform coefficient decoding process for SP/SI | ||||
| Description | In the Chroma transform coefficient decoding process for SP/SI , eqn 8-449 as specified in the H.264 Specification(03/05) right shifts a signed quantity.Where as in the Implementation of this eqn in the JM10.2, first the unsigned quantity is being right shifted and then being multiplied with the sign.It is to be understood that both these steps would produce different results.It is still unclear whether this is a typo error in the specification or wrong implementation in the reference software. dc(ij)s = ( Sign( dc(ij)p ) * ( Abs( dc(ij)p ) * LevelScale2( QSC % 6, 0, 0 ) + ( 1 << ( 15 + QSC / 6 ) ) ) ) >> ( 16 + QSC / 6 ) with i, j = 0, 1 - ( 8-449) | ||||
| Tags | No tags attached. | ||||
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2006-09-20 12:55 | Ramandeep Sandhu | New Issue | |
| 2008-07-24 16:37 | Alexis Michael Tourapis | Note Added: 0000212 | |
| 2008-07-24 16:37 | Alexis Michael Tourapis | Status | new => resolved |
| 2008-07-24 16:37 | Alexis Michael Tourapis | Fixed in Version | => JM-14.1 |
| 2008-07-24 16:37 | Alexis Michael Tourapis | Resolution | open => fixed |
| 2008-07-24 16:37 | Alexis Michael Tourapis | Assigned To | => Alexis Michael Tourapis |
