| virtual VideoIndex* Impala::Core::Stream::Lavc::StrategyIgnoringNativeIndex::ConstructIndexProtected | ( | ) | const [inline, protected, virtual] |
Attempts to determine a unique seek target for all valid key frames; seek targets are expressed in byte positions; the caller assumes ownership of the returned object.
Implements Impala::Core::Stream::Lavc::VideoAccessStrategy.
Definition at line 118 of file StrategyIgnoringNativeIndex.h.
References Impala::Core::Stream::Lavc::VideoIndex::AddFrame(), FindSeekPosition(), Impala::Core::Stream::Lavc::VideoAccessStrategy::FrameIsKey(), Impala::Core::Stream::Lavc::VideoAccessStrategy::FrameIsStable(), Impala::Core::Stream::Lavc::VideoAccessStrategy::FrameIsValid(), ILOG_DEBUG, ILOG_ERROR, Impala::Core::Stream::Lavc::VideoIndex::NrOfEntries(), and Impala::Core::Stream::Lavc::VideoAccessStrategy::NrOfFrames().
00119 { 00120 VideoIndex* videoIndex = new VideoIndex(); 00121 UInt64 seekPos; 00122 int packetToStartSearchAt = -1; 00123 const int frameCount = NrOfFrames(); 00124 for (int f = 0; f < frameCount; f++) 00125 { 00126 if (FrameIsValid(f) && FrameIsKey(f) && FrameIsStable(f)) 00127 { 00128 const bool frameIsSeekable = FindSeekPosition(f, 00129 &seekPos, &packetToStartSearchAt); 00130 if (frameIsSeekable) 00131 { 00132 videoIndex->AddFrame(f, true, seekPos); 00133 ILOG_DEBUG("Indexed frame: " << f << " " << f << 00134 " true " << seekPos); 00135 } 00136 else if (videoIndex->NrOfEntries() == 0) 00137 { 00138 ILOG_ERROR("Failed to find a seek position for " << 00139 "frame " << f); 00140 delete videoIndex; 00141 return 0; 00142 } 00143 } 00144 } 00145 return videoIndex; 00146 }
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