PCMAudioStream.cxx

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/*
 * Copyright (c) 2001-2004 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 "PCMAudioStream.hxx"
#include "AudioFile.hxx"
#include "Assert.hxx"

#ifdef CLAM_DOUBLE
#define CLAM_sf_readf sf_readf_double
#define CLAM_sf_writef sf_writef_double
#else
#define CLAM_sf_readf sf_readf_float
#define CLAM_sf_writef sf_writef_float
#endif

namespace CLAM
{

namespace AudioCodecs
{
        PCMAudioStream::PCMAudioStream( const AudioFile& file )
                : mFileHandle( NULL )
        {
                mName = file.GetLocation();
                mNativeFileParams.channels = file.GetHeader().GetChannels();
                mNativeFileParams.samplerate = (int) file.GetHeader().GetSampleRate();
                mNativeFileParams.format = file.GetHeader().GetFormat() | file.GetHeader().GetEncoding() | file.GetHeader().GetEndianess();
                SetChannels( mNativeFileParams.channels );
        }

        PCMAudioStream::~PCMAudioStream()
        {
                Dispose();
        }

        void PCMAudioStream::PrepareReading()
        {
                mFileHandle = sf_open( mName.c_str(), 
                                       SFM_READ, 
                                       &mNativeFileParams );

                CLAM_ASSERT( mFileHandle != NULL,
                        "Cannot open file for reading!!!" );
                mEOFReached = false;
                mFramePosition = 0;
        }

        void PCMAudioStream::PrepareWriting()
        {
                mFileHandle = sf_open( mName.c_str(),
                                       SFM_WRITE,
                                       &mNativeFileParams );

                CLAM_ASSERT( mFileHandle != NULL,
                        "Cannot open file for writing!!!" );
        }

        void PCMAudioStream::Dispose()
        {
                if ( mFileHandle )
                {
                        sf_close( mFileHandle );
                        mFileHandle = NULL;
                }
        }

        void PCMAudioStream::DiskToMemoryTransfer()
        {
                int nChannels = mNativeFileParams.channels;
                unsigned nFrames = mInterleavedData.size()/nChannels;

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

                sf_count_t framesRead = CLAM_sf_readf( mFileHandle, begin, nFrames );
                mFramesLastRead = (TSize)framesRead;
                mFramePosition += mFramesLastRead;

                if (not framesRead) // No more data to read - EOF reached
                {
                        mEOFReached = true;
                        return;
                }
                if (framesRead<nFrames) // EOF reached
                {
                        mEOFReached = true;
                        for (TData * p=begin+framesRead*nChannels; p!=end; p++)
                                *p= 0.0;
                }
        }

        void PCMAudioStream::MemoryToDiskTransfer()
        {
                unsigned nFrames = mInterleavedData.size()/mChannels;
                const TData* begin = &mInterleavedData[0];
                sf_count_t samplesWritten = CLAM_sf_writef( mFileHandle,
                                                           begin,
                                                           nFrames );

                CLAM_DEBUG_ASSERT( samplesWritten == nFrames,
                             "Could not write all samples to disk!" );
        }

        void PCMAudioStream::SeekTo(long unsigned framePosition)
        {
                mFramePosition = sf_seek(mFileHandle, framePosition, SEEK_SET);
                mEOFReached = false;
        }
}
}