Impala Documentation

void Impala::Core::Stream::RgbDataSrcLavc_old::CheckMD5Hash ( int frameNr ) [inline, private]
Definition at line 1181 of file RgbDataSrcLavc_old.h.
References ILOG_DEBUG, ILOG_ERROR, and ILOG_WARN.
01182     {
01183         if (!mIndexExists)
01184             return;
01185 
01186         String refHash = GetHash(frameNr);
01187         //if (refHash == "") //If it's an avi file there is no hash check
01188         //{
01189         //    mIsFrameAccurate = true;
01190         //    return;
01191         //}
01192 
01193         //Array2dVec3UInt8* arr = new Array2dVec3UInt8(FrameWidth(),
01194         //                                             FrameHeight(), 0, 0,
01195         //                                             DataPtr(),true,false);
01196         //String hash = Array::MD5Hash(arr);
01197         //delete arr;
01198         String hash = CalcHash_protected();
01199 
01200         ILOG_DEBUG("[CheckMD5Hash] frameNr=" << frameNr << " hash_calculated=" << hash << " hash_found=" << refHash);
01201 
01202         mIsFrameAccurate = (hash==refHash);
01203         if (!mFixIndexIfBroken)
01204         {
01205             if (!mIsFrameAccurate)
01206             {
01207                 ILOG_ERROR("Jumping to Frame("<<frameNr<<") ends in Frame("
01208                             <<GetFrameFromHash(hash)<<")");
01209                 
01210             }
01211             return;
01212         }
01213    
01214         //if it's not frame accurate, we have to relocate our position
01215         if (!mIsFrameAccurate)
01216         {
01217             if (true)
01218             {
01219                 ILOG_ERROR("SK: Index is not correct for video: " << mSrcName);
01220                 throw LAVCException("Index is not correct", 0);
01221             }
01222 
01223 
01224             if (frameNr==mLastFixNr)
01225             {
01226                 mFixCnt++;
01227                 if (mFixCnt>10)
01228                 {
01229                     String msg = "Cannot Fix video: " + mSrcName;
01230                     ILOG_ERROR(msg << "; try with src=LAVC_NOIDX");
01231                     throw LAVCException(msg, 0);
01232                 }
01233             }
01234             else{
01235                 mFixCnt=0;
01236                 mLastFixNr=frameNr;
01237             }
01238 
01239             ILOG_WARN("Fixing Frame Accuracy for frame "<<frameNr
01240                     <<" (ended in "<<GetFrameFromHash(hash)<<")");
01241 
01242             //Find the broken key frame that we couldn't jump to 
01243             //and discard it from the index
01244             int BrokenKey = GetSeekableFrame(frameNr);
01245             
01246             int fNr = frameNr;
01247             int cNr = mBufferedFrameNr;
01248             
01249             while (--fNr)
01250             {
01251                 ILOG_DEBUG("Checking for previous Non-Broken @ "<< fNr);
01252 
01253                 if (fNr < 0)
01254                 {
01255                     ILOG_ERROR("fNr is negative (" << fNr << ") and cannot be used as a column index");
01256                     return;
01257                 }
01258 
01259                 if ( (UInt32) fNr < mBlankFrames)
01260                 {
01261                     ILOG_DEBUG("fNr (" << fNr << ") is less than mBlankFrames (" << mBlankFrames << ")");
01262                     return;
01263                 }
01264                 if (fNr==mBlankFrames)
01265                     break;
01266 
01267                 if (GetSeekableFrame(fNr) != BrokenKey)
01268                     break;
01269             }
01270 
01271             ILOG_DEBUG("Found Previous Non-Broken frame " << fNr);
01272             
01273             int     PrevKey    = GetSeekableFrame(fNr);
01274             if (PrevKey < 0)
01275             {
01276                 ILOG_ERROR("PrevKey has negative value: " << PrevKey);
01277                 return;
01278             }
01279             int64_t PrevKeyPos = GetPos(fNr);
01280             ILOG_DEBUG("Previous Non-Broken for Keyframe " << PrevKey);
01281         
01282             fNr++;
01283             while (GetSeekableFrame(fNr)==BrokenKey)
01284             {
01285                 ILOG_DEBUG("Resetting keyframe Information for  "<<fNr);
01286                 SetKey(fNr,PrevKey);
01287                 SetPos(fNr,PrevKeyPos);                
01288                 fNr++;
01289             }
01290             ILOG_DEBUG("Retrying...");
01291             
01292             //Jump(GetPos(0), AVSEEK_FLAG_BYTE, 2, 2);
01293             //mBufferedFrameNr = mBlankFrames;
01294             Reset();
01295             ReadFrameData();
01296         }
01297         else
01298         {
01299             ILOG_DEBUG("Frame Accuracy OK for frame "<<frameNr);
01300         }
01301     }