Traverso/cvs/traverso/src/audiofileio/decode/ResampleAudioReader.h

/*
Copyright (C) 2007 Ben Levitt 

This file is part of Traverso

Traverso 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.

*/

#ifndef RESAMPLEAUDIOREADER_H
#define RESAMPLEAUDIOREADER_H

#include <AbstractAudioReader.h>
#include <QVector>
#include <samplerate.h>


class ResampleAudioReader : public AbstractAudioReader
{

public:
        ResampleAudioReader(QString filename, const QString& decoder);
        ~ResampleAudioReader();
        
        nframes_t read_from(DecodeBuffer* buffer, nframes_t start, nframes_t count) {
                return AbstractAudioReader::read_from(buffer, start, count);
        }
        nframes_t read_from(DecodeBuffer* buffer, const TimeRef& start, nframes_t count) {
                TimeRef location = start;
                return AbstractAudioReader::read_from(buffer, location.to_frame(m_outputRate), count);
        }
        QString decoder_type() const {return (m_reader) ? m_reader->decoder_type() : "";}
        void clear_buffers();
        
        int get_output_rate();
        int get_file_rate();
        int get_convertor_type() const {return m_convertorType;}
        void set_output_rate(int rate);
        void set_converter_type(int converter_type);
        void set_resample_decode_buffer(DecodeBuffer* buffer);
        
protected:
        void reset();
        
        bool seek_private(nframes_t start);
        nframes_t read_private(DecodeBuffer* buffer, nframes_t frameCount);
        
        nframes_t resampled_to_file_frame(nframes_t frame);
        nframes_t file_to_resampled_frame(nframes_t frame);
        
        AbstractAudioReader*    m_reader;
        QVector<SRC_STATE*>     m_srcStates;
        SRC_DATA                m_srcData;
        audio_sample_t**        m_overflowBuffers;
        long                    m_overflowUsed;
        int                     m_outputRate;
        int                     m_convertorType;
        bool                    m_isResampleAvailable;
        nframes_t               m_readExtraFrames;
        
private:
        void create_overflow_buffers();
        DecodeBuffer* m_resampleDecodeBuffer;
        bool m_resampleDecodeBufferIsMine;
};

#endif

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