AudioCodecs_Stream.cxx

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/*
 * Copyright (c) 2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "AudioCodecs_Stream.hxx"

namespace CLAM
{

namespace AudioCodecs
{
        Stream::Stream()
                : mFramesLastRead(0)
                , mFramePosition(0)
        {
        }

        Stream::~Stream()
        {
        }

        bool Stream::ReadData( int channel, TData* buffer, unsigned nFrames )
        {
                AdjustInterleavedBuffer( nFrames );
                DiskToMemoryTransfer();
                if ( mFramesLastRead == 0 ) return mEOFReached;

                // Actual data reading
                const TData* begin = &mInterleavedData[0];
                const TData* end = begin + mInterleavedData.size();
                for (const TData* i = begin + channel; i < end; i+=mChannels, buffer++ )
                        *buffer = *i;
                
                return mEOFReached;
                       
        }
        bool Stream::ReadData(TData** buffers, unsigned nFrames )
        {
                AdjustInterleavedBuffer( nFrames );
                DiskToMemoryTransfer();
                if ( mFramesLastRead == 0 ) return mEOFReached;

                const TData * interleaved = &mInterleavedData[0];
                for (unsigned iFrame=0; iFrame<nFrames; iFrame++)
                        for (unsigned iChannel=0; iChannel<mChannels; iChannel++)
                                buffers[iChannel][iFrame] = *interleaved++;

                return mEOFReached;
        }

        bool Stream::ReadData( int* channels, int nchannels, TData** buffers, unsigned nFrames )
        {
                AdjustInterleavedBuffer( nFrames );
                DiskToMemoryTransfer();
                if ( mFramesLastRead == 0 ) return mEOFReached;

                // Actual data reading
                const TData* begin = &mInterleavedData[0];
                const TData* end = begin + mInterleavedData.size();
                const int* endChannels = channels + nchannels;
                
                for( int* currentChannel = channels;
                         currentChannel != endChannels;
                         currentChannel++ )
                {
                        const int channelIndex = *currentChannel;
                        TData* pSamples = buffers[channelIndex];
                        for ( const TData* i = begin + channelIndex; i<end; i+=mChannels)
                        {
                                *pSamples++ = *i;
                        }
                }
                return mEOFReached;
        }

        void Stream::AdjustInterleavedBuffer( unsigned nFrames )
        {
                unsigned newSize = nFrames * mChannels;
                if (newSize == mInterleavedData.size()) return;
                mInterleavedData.resize( nFrames * mChannels );
        }

        void Stream::WriteData( int channel, const TData* buffer, unsigned nFrames )
        {
                AdjustInterleavedBuffer( nFrames );
                TData* beginData = &mInterleavedData[0];
                TData* endData = beginData + mInterleavedData.size();
                for (TData* data = beginData+channel; data < endData; data += mChannels)
                        *data = *buffer++;

                MemoryToDiskTransfer();
        }

        void Stream::WriteData(TData ** const buffers, unsigned nFrames)
        {
                AdjustInterleavedBuffer( nFrames );

                TData * interleaved = &mInterleavedData[0];
                for (unsigned iFrame=0; iFrame<nFrames; iFrame++)
                        for (unsigned iChannel=0; iChannel<mChannels; iChannel++)
                                *interleaved++ = buffers[iChannel][iFrame];

                MemoryToDiskTransfer();
        }

        void Stream::WriteData( int* channels, int nchannels,
                                TData** const samples, unsigned nFrames )
        {
                AdjustInterleavedBuffer( nFrames );

                TData* begin = &mInterleavedData[0];
                TData* end = begin + mInterleavedData.size();
                const int* endChannels = channels + nchannels;

                for( int* currentChannel = channels;
                     currentChannel != endChannels;
                     currentChannel++ )
                {
                        const int channelIndex = *currentChannel;
                        const TData* pSamples = *(samples + channelIndex);
                        for ( TData* i = begin + channelIndex; i<end; i+=mChannels, pSamples++ )
                        {
                                *i = *pSamples; 
                        }
                }

                MemoryToDiskTransfer();
        }

        void Stream::SetChannels( unsigned nChannels )
        {
                mChannels = nChannels;
        }

}

}