PCMCodec.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
 *
 */

#if USE_SNDFILE != 1
#error USE_SNDFILE was not set to 1 in your settings.cfg file, but you are including files that require this. Please fix your settings.cfg
#endif

#include "PCMCodec.hxx"
#include "AudioFileFormats.hxx"
#include "AudioFile.hxx"
#include "AudioFileHeader.hxx"
#include "DataTypes.hxx"
#include <sndfile.h>
#include "PCMAudioStream.hxx"

namespace CLAM
{

namespace AudioCodecs
{
        PCMCodec::PCMCodec()
        {
        }

        PCMCodec::~PCMCodec()
        {
        }

        PCMCodec& PCMCodec::Instantiate()
        {
                static PCMCodec theInstance;

                return theInstance;
        }

        bool PCMCodec::IsReadable( std::string uri ) const
        {
                SNDFILE*   fileHandle = NULL;
                SF_INFO   fileHeaderInfo;
                // MRJ: Done as libsndfile doc says
                fileHeaderInfo.format = 0;

                fileHandle = sf_open( uri.c_str(), SFM_READ, &fileHeaderInfo );

                if ( fileHandle != NULL )
                {
                        sf_close( fileHandle );
                        return true;
                }

                // TODO: An exception should be thrown
                return false;

        }

        bool PCMCodec::IsWritable( std::string uri, const AudioFileHeader& header ) const
        {
                if ( !header.HasSampleRate() )
                        return false;
                if ( !header.HasChannels() )
                        return false;
                if ( !header.HasFormat() )
                        return false;
                if ( !header.HasEncoding() )
                        return false;
                if ( !header.HasEndianess() )
                        return false;

                SF_INFO fileInfo;
                fileInfo.samplerate = (int)header.GetSampleRate();
                fileInfo.channels = (int)header.GetChannels();
                fileInfo.format = header.GetFormat() | header.GetEncoding() | header.GetEndianess();

                return sf_format_check( &fileInfo ) == 1;
        }

        Stream* PCMCodec::GetStreamFor( const AudioFile& file )
        {
                return new PCMAudioStream(file);
        }

        void PCMCodec::RetrieveHeaderData( std::string uri, AudioFileHeader& hdr )
        {
                SNDFILE* fileHandle = NULL;
                SF_INFO  fileHeaderInfo;
                fileHeaderInfo.format = 0;
                
                fileHandle = sf_open( uri.c_str(), SFM_READ, &fileHeaderInfo );
                
                if ( fileHandle != NULL )
                {
                        hdr.AddSampleRate();
                        hdr.AddSamples();
                        hdr.AddChannels();
                        hdr.AddFormat();
                        hdr.AddEncoding();
                        hdr.AddEndianess();
                        hdr.AddLength();
                        hdr.UpdateData();
                                                
                        hdr.SetSampleRate( (TData)fileHeaderInfo.samplerate );
                        hdr.SetSamples( (TSize)fileHeaderInfo.frames );
                        hdr.SetChannels( (TSize)fileHeaderInfo.channels );
                        hdr.SetFormat( fileHeaderInfo.format & SF_FORMAT_TYPEMASK );
                        hdr.SetEncoding( fileHeaderInfo.format & SF_FORMAT_SUBMASK );
                        hdr.SetEndianess( fileHeaderInfo.format & SF_FORMAT_ENDMASK );
                        hdr.SetLength( TTime(fileHeaderInfo.frames) / hdr.GetSampleRate() );
                        hdr.SetLength( hdr.GetLength() * 1000. );
                        sf_close(fileHandle);
                }

        }
}

}