AUD_SequencerReader.cpp

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * Copyright 2009-2011 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * Audaspace 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.
 *
 * AudaSpace 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 Audaspace; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "AUD_SequencerReader.h"

typedef std::list<AUD_Reference<AUD_SequencerHandle> >::iterator AUD_HandleIterator;
typedef std::list<AUD_Reference<AUD_SequencerEntry> >::iterator AUD_EntryIterator;

AUD_SequencerReader::AUD_SequencerReader(AUD_Reference<AUD_SequencerFactory> factory, bool quality) :
    m_position(0), m_device(factory->m_specs), m_factory(factory), m_status(0), m_entry_status(0)
{
    m_device.setQuality(quality);
}

AUD_SequencerReader::~AUD_SequencerReader()
{
}

bool AUD_SequencerReader::isSeekable() const
{
    return true;
}

void AUD_SequencerReader::seek(int position)
{
    m_position = position;

    for(AUD_HandleIterator it = m_handles.begin(); it != m_handles.end(); it++)
    {
        (*it)->seek(position / m_factory->m_specs.rate);
    }
}

int AUD_SequencerReader::getLength() const
{
    return -1;
}

int AUD_SequencerReader::getPosition() const
{
    return m_position;
}

AUD_Specs AUD_SequencerReader::getSpecs() const
{
    return m_factory->m_specs;
}

void AUD_SequencerReader::read(int& length, bool& eos, sample_t* buffer)
{
    m_factory->lock();

    if(m_factory->m_status != m_status)
    {
        m_device.changeSpecs(m_factory->m_specs);
        m_device.setSpeedOfSound(m_factory->m_speed_of_sound);
        m_device.setDistanceModel(m_factory->m_distance_model);
        m_device.setDopplerFactor(m_factory->m_doppler_factor);

        m_status = m_factory->m_status;
    }

    if(m_factory->m_entry_status != m_entry_status)
    {
        std::list<AUD_Reference<AUD_SequencerHandle> > handles;

        AUD_HandleIterator hit = m_handles.begin();
        AUD_EntryIterator  eit = m_factory->m_entries.begin();

        int result;
        AUD_Reference<AUD_SequencerHandle> handle;

        while(hit != m_handles.end() && eit != m_factory->m_entries.end())
        {
            handle = *hit;
            AUD_Reference<AUD_SequencerEntry> entry = *eit;

            result = handle->compare(entry);

            if(result < 0)
            {
                try
                {
                    handle = new AUD_SequencerHandle(entry, m_device);
                    handles.push_front(handle);
                }
                catch(AUD_Exception&)
                {
                }
                eit++;
            }
            else if(result == 0)
            {
                handles.push_back(handle);
                hit++;
                eit++;
            }
            else
            {
                handle->stop();
                hit++;
            }
        }

        while(hit != m_handles.end())
        {
            (*hit)->stop();
            hit++;
        }

        while(eit != m_factory->m_entries.end())
        {
            try
            {
                handle = new AUD_SequencerHandle(*eit, m_device);
                handles.push_front(handle);
            }
            catch(AUD_Exception&)
            {
            }
            eit++;
        }

        m_handles = handles;

        m_entry_status = m_factory->m_entry_status;
    }

    AUD_Specs specs = m_factory->m_specs;
    int pos = 0;
    float time = float(m_position) / float(specs.rate);
    float volume, frame;
    int len, cfra;
    AUD_Vector3 v, v2;
    AUD_Quaternion q;


    while(pos < length)
    {
        frame = time * m_factory->m_fps;
        cfra = int(floor(frame));

        len = int(ceil((cfra + 1) / m_factory->m_fps * specs.rate)) - m_position;
        len = AUD_MIN(length - pos, len);
        len = AUD_MAX(len, 1);

        for(AUD_HandleIterator it = m_handles.begin(); it != m_handles.end(); it++)
        {
            (*it)->update(time, frame, m_factory->m_fps);
        }

        m_factory->m_volume.read(frame, &volume);
        m_device.setVolume(volume);

        m_factory->m_orientation.read(frame, q.get());
        m_device.setListenerOrientation(q);
        m_factory->m_location.read(frame, v.get());
        m_device.setListenerLocation(v);
        m_factory->m_location.read(frame + 1, v2.get());
        v2 -= v;
        m_device.setListenerVelocity(v2 * m_factory->m_fps);

        m_device.read(reinterpret_cast<data_t*>(buffer + specs.channels * pos), len);

        pos += len;
        time += float(len) / float(specs.rate);
    }

    m_factory->unlock();

    m_position += length;

    eos = false;
}