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_read sf_readf_double
#define CLAM_sf_write sf_writef_double
#else
#define CLAM_sf_read sf_readf_float
#define CLAM_sf_write sf_writef_float
#endif

namespace CLAM
{

namespace AudioCodecs
{
        PCMAudioStream::PCMAudioStream()
                : mFileHandle( NULL )
        {
                mNativeFileParams.format = 0;
        }

        PCMAudioStream::PCMAudioStream( const AudioFile& file )
                : mFileHandle( NULL )
        {
                SetFOI( file );

        }

        PCMAudioStream::~PCMAudioStream()
        {
                if ( mFileHandle )
                {
                        sf_close( mFileHandle );
                }
        }

        void PCMAudioStream::AudioFileToNative( const AudioFile& file)
        {
                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();
        }

        void PCMAudioStream::SetFOI( const AudioFile& file )
        {
                Dispose();
                AudioFileToNative(file);
                SetChannels( mNativeFileParams.channels );
        }

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

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

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

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

                MarkAllChannelsAsProduced();
        }

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

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

                MarkAllChannelsAsConsumed();
                MarkAllChannelsAsProduced();
                mEOFReached = false;
        }

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

        void PCMAudioStream::DiskToMemoryTransfer()
        {
                int channelCount = mNativeFileParams.channels;                  
                
                sf_count_t framesRead = CLAM_sf_read( mFileHandle, 
                                                       mInterleavedData.GetPtr(),
                                                       mFramesToRead );

                mFramesLastRead = (TSize)framesRead;
                
                if ( framesRead == 0 ) // No more data to read - EOF reached
                {
                        mEOFReached = true;
                        return;
                }
                
                if ( framesRead < mFramesToRead ) // EOF reached
                {
                        // We set the remainder to zero

                        const TData* end = mInterleavedData.GetPtr() + mInterleavedData.Size();

                        for ( TData* i = mInterleavedData.GetPtr() + ( framesRead * channelCount );
                              i != end;
                              i++ )
                                *i = 0.0;
                        
                        mEOFReached = true;
                }               
        }

        
        void PCMAudioStream::MemoryToDiskTransfer()
        {
                sf_count_t samplesWritten = CLAM_sf_write( mFileHandle,
                                                           mInterleavedDataOut.GetPtr(),
                                                           mFramesToWrite );

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

}
}

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