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feat: gate padding recon override on bSubcodecMode with hardcoded 1-MB border

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Isaac 2026-04-07 08:41:06 +02:00
parent 9871479b27
commit e647f733c9
1 changed files with 27 additions and 0 deletions
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27
third-party/openh264/third_party/openh264/src/codec/encoder/core/src/svc_encode_slice.cpp vendored
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@ -564,6 +564,33 @@ TRY_REENCODING:
if (ENC_RETURN_SUCCESS != iEncReturn)
return iEncReturn;
// [subcodec] For padding MBs, overwrite reconstruction buffer with exact black.
// This ensures content MBs' I_16x16 predictions are computed against exact-black
// neighbors, making their coefficients transplantable to the composite frame.
{
if (pEncCtx->pSvcParam->bSubcodecMode) {
const int32_t kiMbX = iCurMbIdx % pCurLayer->iMbWidth;
const int32_t kiMbY = iCurMbIdx / pCurLayer->iMbWidth;
if (kiMbX < 1 || kiMbX >= pCurLayer->iMbWidth - 1 ||
kiMbY < 1 || kiMbY >= pCurLayer->iMbHeight - 1) {
// Overwrite luma reconstruction to black (Y=0)
uint8_t* pCsY = pMbCache->SPicData.pCsMb[0];
const int32_t kiCsStrideY = pCurLayer->iCsStride[0];
for (int32_t r = 0; r < MB_WIDTH_LUMA; r++) {
memset(pCsY + r * kiCsStrideY, 0, MB_WIDTH_LUMA);
}
// Overwrite chroma reconstruction to neutral (Cb=128, Cr=128)
uint8_t* pCsCb = pMbCache->SPicData.pCsMb[1];
uint8_t* pCsCr = pMbCache->SPicData.pCsMb[2];
const int32_t kiCsStrideUV = pCurLayer->iCsStride[1];
for (int32_t r = 0; r < MB_WIDTH_CHROMA; r++) {
memset(pCsCb + r * kiCsStrideUV, 128, MB_WIDTH_CHROMA);
memset(pCsCr + r * kiCsStrideUV, 128, MB_WIDTH_CHROMA);
}
}
}
}
pCurMb->uiSliceIdc = kiSliceIdx;
#if defined(MB_TYPES_CHECK)