svcore  1.9
AudioFileReader.cpp
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00001 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
00002 
00003 /*
00004     Sonic Visualiser
00005     An audio file viewer and annotation editor.
00006     Centre for Digital Music, Queen Mary, University of London.
00007     This file copyright 2006 Chris Cannam.
00008     
00009     This program is free software; you can redistribute it and/or
00010     modify it under the terms of the GNU General Public License as
00011     published by the Free Software Foundation; either version 2 of the
00012     License, or (at your option) any later version.  See the file
00013     COPYING included with this distribution for more information.
00014 */
00015 
00016 #include "AudioFileReader.h"
00017 
00018 void
00019 AudioFileReader::getDeInterleavedFrames(int start, int count,
00020                                         std::vector<SampleBlock> &frames) const
00021 {
00022     SampleBlock interleaved;
00023     getInterleavedFrames(start, count, interleaved);
00024     
00025     int channels = getChannelCount();
00026     int rc = interleaved.size() / channels;
00027 
00028     frames.clear();
00029 
00030     for (int c = 0; c < channels; ++c) {
00031         frames.push_back(SampleBlock());
00032     }
00033 
00034     for (int i = 0; i < rc; ++i) {
00035         for (int c = 0; c < channels; ++c) {
00036             frames[c].push_back(interleaved[i * channels + c]);
00037         }
00038     }
00039 }
00040