Impala Documentation

void Impala::Core::Stream::RgbDataSrcLavc_old::PopulateAviIndex ( ) [inline, private]
Definition at line 952 of file RgbDataSrcLavc_old.h.
References ILOG_DEBUG, ILOG_ERROR, and ILOG_INFO.
00953     {
00954         ILOG_INFO("Timestamp Based Indexing for AVI started!");
00955 
00956         if (mBlankFrames > 0)
00957         {
00958             // for AVI lavc is not expected to actually try to read invalid frames 
00959             ILOG_ERROR("Did not expect blank frames to have been registered here");
00960             return;
00961         }
00962 
00963         const AVIndexEntry * const idx = mVideoStream->index_entries;
00964         if (!idx)
00965         {
00966             ILOG_ERROR("Stream contains no index");
00967             mFrameCnt = 0;
00968             mLastFrame = -1;
00969             return;
00970         }
00971 
00972         mFrameCnt = mVideoStream->nb_index_entries;
00973         mLastFrame = mFrameCnt - 1;
00974         ILOG_INFO("FrameCount from Index: " << mFrameCnt);
00975 
00976         for (int e = 0; e <= 20; e++)
00977             ILOG_DEBUG("index entry " << e << ": size=" << idx[e].size << ", flags=" << idx[e].flags << ", timestamp=" << idx[e].timestamp << ", pos=" << idx[e].pos << ", min_distance=" << idx[e].min_distance << ")"); 
00978 
00979         // add dummy index entries for all leading bad frames;
00980         // note that the currently cached frame is the first valid key-frame,
00981         // and that leading bad frames may already have been marked as such;
00982         int indexPos = 0;
00983         while (indexPos < mFrameCnt &&
00984             (idx[indexPos].size <= 0 ||  // assumed to indicate frame validity
00985             idx[indexPos].flags != AVINDEX_KEYFRAME))
00986         {
00987             MarkBadFrame(indexPos);
00988             AddIndex(indexPos, -1, -1, DUMMY_FRAME_HASH);
00989             ILOG_DEBUG(indexPos << " -1 -1 " << DUMMY_FRAME_HASH << " (idx[indexPos].size=" << idx[indexPos].size << ", idx[indexPos].flags=" << idx[indexPos].flags << ", idx[indexPos].timestamp=" << idx[indexPos].timestamp << ")");
00990             indexPos++;
00991         }
00992 
00993         if (indexPos > 0)
00994         {
00995             mBlankFrames = mBufferedFrameNr = mCurrentFrameNr = indexPos;
00996             ILOG_INFO("Stream starts with " << mBlankFrames << " bad frame(s)");
00997         }
00998 
00999         // reset in order to make jumping back to the head of file reproducable also for mpeg4 files;
01000         // (without using the index)
01001         const int posZero = 0;
01002         const int flush = 2;
01003         const int no_sync = 1;
01004         const int sync = 2;
01005         Jump(posZero, mJumpFlags, flush, no_sync);
01006         Jump(mBlankFrames, mJumpFlags, flush, sync);
01007         ILOG_DEBUG("Jumped to head of file");
01008 
01009         int lastKeyPos = -1;
01010         int64_t keyPts = -1;
01011         for (; indexPos < mFrameCnt; indexPos++)
01012         //for (; indexPos < 100; indexPos++)
01013         {
01014             if (idx[indexPos].size <= 0)
01015             {
01016                 ILOG_INFO("Bad frame at index position: " << indexPos << " (idx[indexPos].size=" << idx[indexPos].size << ", idx[indexPos].flags=" << idx[indexPos].flags << ", idx[indexPos].timestamp=" << idx[indexPos].timestamp << ")");
01017                 AddIndex(indexPos, -1, -1, DUMMY_FRAME_HASH);
01018                 ILOG_DEBUG(indexPos << " -1 -1 " << DUMMY_FRAME_HASH);
01019                 MarkBadFrame(indexPos);
01020                 mCurrentFrameNr++;
01021                 mBufferedFrameNr++;
01022                 continue;
01023             }
01024 
01025             if (indexPos > mBlankFrames) // the first valid (key-) frame is currently in the frame cache
01026                 NextFrame();
01027 
01028             String frameHash;
01029             if (FrameValid(mCurrentFrameNr))
01030             {
01031                 if (idx[indexPos].flags == AVINDEX_KEYFRAME )
01032                 {
01033                     lastKeyPos = indexPos;
01034                     keyPts = idx[lastKeyPos].timestamp;
01035                 }
01036                 frameHash = CalcHash();
01037             }
01038             else
01039                 frameHash = DUMMY_FRAME_HASH;
01040 
01041             AddIndex(indexPos, lastKeyPos, keyPts, frameHash);
01042             ILOG_DEBUG(indexPos << " " << lastKeyPos
01043                         << " " << keyPts << " " << frameHash);
01044         }
01045 
01046         mIndexExists = true;
01047     }