AudioFile.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 "AudioFile.hxx"
#include "Assert.hxx"
#include "PCMCodec.hxx"
#if USE_OGGVORBIS == 1
#  include "OggVorbisCodec.hxx"
#endif

#if USE_MAD == 1
#  include "MpegCodec.hxx"
#endif

namespace CLAM
{
        AudioFile::AudioFile()
                : mCodec( EAudioFileCodec::eUnknown )
                , mActiveCodec( NULL )
        {
        }

        AudioFile::AudioFile( const AudioFile& obj )
        {
                mLocation = obj.mLocation;
                mActiveCodec = obj.mActiveCodec;
                mCodec = obj.mCodec;
                mHeaderData = obj.mHeaderData;
                mTextDescriptors = obj.mTextDescriptors;
        }

        const AudioFile& AudioFile::operator=( const AudioFile& obj )
        {
                mLocation = obj.mLocation;
                mActiveCodec = obj.mActiveCodec;
                mCodec = obj.mCodec;
                mHeaderData = obj.mHeaderData;
                mTextDescriptors = obj.mTextDescriptors;
                return *this;
        }

        AudioFile::~AudioFile()
        {
        }
        
        void AudioFile::ResolveCodec()
        {
                mActiveCodec = NULL;

                const std::string &location = mLocation;
                if ( !AudioCodecs::Codec::FileExists( location ) )
                {               
                        mCodec = EAudioFileCodec::eUnknown;
                        return;
                }

                if ( AudioCodecs::PCMCodec::Instantiate().IsReadable( location ) )
                {
                        mCodec = EAudioFileCodec::ePCM;
                        mActiveCodec = &AudioCodecs::PCMCodec::Instantiate();
                }
#if USE_OGGVORBIS == 1
                else if ( AudioCodecs::OggVorbisCodec::Instantiate().IsReadable( location ) )
                {
                        mCodec = EAudioFileCodec::eOggVorbis;
                        mActiveCodec = &AudioCodecs::OggVorbisCodec::Instantiate();             
                }
#endif          
#if USE_MAD == 1
                else if ( AudioCodecs::MpegCodec::Instantiate().IsReadable( location ) )
                {
                        mCodec = EAudioFileCodec::eMpeg;
                        mActiveCodec = &AudioCodecs::MpegCodec::Instantiate();
                }
#endif
                else
                        mCodec = EAudioFileCodec::eUnknown;             
        }

        bool AudioFile::SetHeader( const AudioFileHeader& newHeader )
        {
                mHeaderData.AddAll();
                mHeaderData.UpdateData();
                
                if ( !newHeader.HasSampleRate() )
                        return false;
                else
                        mHeaderData.SetSampleRate( newHeader.GetSampleRate() );

                if ( !newHeader.HasChannels() )
                        mHeaderData.SetChannels( 1 );
                else
                        mHeaderData.SetChannels( newHeader.GetChannels() );

                if ( !newHeader.HasFormat() )
                        return false;

                if ( newHeader.HasEncoding() )
                        mHeaderData.SetEncoding( newHeader.GetEncoding() );
                

                if ( newHeader.GetFormat() < EAudioFileFormat::eVorbisMk1 )
                {
                        mCodec = EAudioFileCodec::ePCM;
                        mActiveCodec = &AudioCodecs::PCMCodec::Instantiate();
                }
                else if ( newHeader.GetFormat() == EAudioFileFormat::eVorbisMk1 )
                {
                        mCodec = EAudioFileCodec::eOggVorbis;
#if USE_OGGVORBIS==1            
                        mActiveCodec= &AudioCodecs::OggVorbisCodec::Instantiate();
#endif          
                }
                else
                        CLAM_ASSERT( false, "The Enum contained and invalid value!" );

                mHeaderData.SetFormat( newHeader.GetFormat() );

                if ( !newHeader.HasEndianess() )
                        mHeaderData.SetEndianess( EAudioFileEndianess::eDefault );
                else
                        mHeaderData.SetEndianess( newHeader.GetEndianess() );
                
                return true;
        }

        EAudioFileCodec AudioFile::GetCodec() const
        {
                return mCodec;
        }

        bool AudioFile::IsValid() const
        {
                return mActiveCodec == NULL;
        }

        bool AudioFile::IsReadable() const
        {
                return mActiveCodec && mActiveCodec->IsReadable(mLocation);
        }

        bool AudioFile::IsWritable() const
        {
                return mActiveCodec && mActiveCodec->IsWritable(mLocation, mHeaderData );
        }

        AudioCodecs::Stream*  AudioFile::GetStream()
        {
                if ( !mActiveCodec ) return 0;
                return mActiveCodec->GetStreamFor( *this );
        }

        void AudioFile::ActivateCodec()
        {
                if (!mActiveCodec) return;
                mActiveCodec->RetrieveHeaderData( mLocation, mHeaderData );
                mActiveCodec->RetrieveTextDescriptors( mLocation, mTextDescriptors );                           
        }
                
        void AudioFile::ResetHeaderData()
        {
                mHeaderData.RemoveAll();
                mHeaderData.UpdateData();
        }

        /* =============================================================== */

        void AudioFileSource::OpenExisting(const std::string &location)
        {
                mLocation = location;
                ResolveCodec();
                ActivateCodec();
                if ( mCodec == EAudioFileCodec::eUnknown )
                        ResetHeaderData();
        }

        /* =============================================================== */

        bool AudioFileTarget::CreateNew(const std::string &location,
                        const AudioFileHeader &header)
        {
                mLocation = location;
                return SetHeader(header);
        }

}