| 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 119 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().
00120 { 00121 VideoIndex* videoIndex = new VideoIndex(); 00122 UInt64 seekPos; 00123 int packetToStartSearchAt = -1; 00124 const int frameCount = NrOfFrames(); 00125 for (int f = 0; f < frameCount; f++) 00126 { 00127 if (FrameIsValid(f) && FrameIsKey(f) && FrameIsStable(f)) 00128 { 00129 const bool frameIsSeekable = FindSeekPosition(f, 00130 &seekPos, &packetToStartSearchAt); 00131 if (frameIsSeekable) 00132 { 00133 videoIndex->AddFrame(f, true, seekPos); 00134 ILOG_DEBUG("Indexed frame: " << f << " " << f << 00135 " true " << seekPos); 00136 } 00137 else if (videoIndex->NrOfEntries() == 0) 00138 { 00139 ILOG_ERROR("Failed to find a seek position for " << 00140 "frame " << f); 00141 delete videoIndex; 00142 return 0; 00143 } 00144 } 00145 } 00146 return videoIndex; 00147 }
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