shithub: openh264

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avoid using the same picture buff for prev pic and curr pic

--- a/codec/decoder/core/src/decoder.cpp

+++ b/codec/decoder/core/src/decoder.cpp

@@ -178,10 +178,11 @@

  */

 static inline int32_t GetTargetRefListSize (PWelsDecoderContext pCtx) {

   int32_t iNumRefFrames	= 0;

+  // +2 for EC MV Copy buffer exchange

   if ((pCtx == NULL) || (pCtx->pSps == NULL)) {

-    iNumRefFrames = MAX_REF_PIC_COUNT;

+    iNumRefFrames = MAX_REF_PIC_COUNT + 2;

   } else {

-    iNumRefFrames = pCtx->pSps->iNumRefFrames + 1;

+    iNumRefFrames = pCtx->pSps->iNumRefFrames + 2;

   }

 #ifdef LONG_TERM_REF

--- a/codec/decoder/core/src/decoder_core.cpp

+++ b/codec/decoder/core/src/decoder_core.cpp

@@ -2152,6 +2152,7 @@

         } else if (pCtx->eErrorConMethod == ERROR_CON_SLICE_MV_COPY_CROSS_IDR

                    || pCtx->eErrorConMethod == ERROR_CON_SLICE_MV_COPY_CROSS_IDR_FREEZE_RES_CHANGE) {

           pCtx->pPreviousDecodedPictureInDpb = pCtx->pDec; //save ECed pic for future MV Copy use

+          pCtx->pDec = NULL;

         }

       } else {

         if (DecodeFrameConstruction (pCtx, ppDst, pDstInfo))

--- a/codec/decoder/core/src/error_concealment.cpp

+++ b/codec/decoder/core/src/error_concealment.cpp

@@ -164,6 +164,9 @@

 //Do error concealment using slice MV copy method

 void DoMbECMvCopy (PWelsDecoderContext pCtx, PPicture pDec, PPicture pRef, int32_t iMbXy, int32_t iMbX, int32_t iMbY,

                    sMCRefMember* pMCRefMem) {

+  if (pDec == pRef) {

+    return; // for protection, shall never go into this logic, error info printed outside.

+  }

   int16_t iMVs[2];

   int32_t iMbXInPix = iMbX << 4;

   int32_t iMbYInPix = iMbY << 4;

@@ -381,6 +384,10 @@

     sMCRefMem.iDstLineChroma = pDstPic->iLinesize[1];

     sMCRefMem.iPicWidth = pDstPic->iWidthInPixel;

     sMCRefMem.iPicHeight = pDstPic->iHeightInPixel;

+    if (pDstPic == pSrcPic) {

+      // output error info, EC will be ignored in DoMbECMvCopy

+      WelsLog (& (pCtx->sLogCtx), WELS_LOG_ERROR, "DoErrorConSliceMVCopy()::pPreviousPic and pDec use same buffer, ignored.");

+    }

   }

   for (int32_t iMbY = 0; iMbY < iMbHeight; ++iMbY) {