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The current implementation using std::vector is too slow. This CL introduces a new implementation, using a regular array as data container. In AudioMultiVector::ReadInterleavedFromIndex, a special case for 1 channel was implemented, to further reduce runtime. Finally, AudioMultiVector::Channels was reimplemented. The changes in this CL reduces the runtime of neteq4_speed_test by 33%. BUG=1363 R=turaj@webrtc.org Review URL: https://webrtc-codereview.appspot.com/3509004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5115 4adac7df-926f-26a2-2b94-8c16560cd09d