AUD_DoubleReader.cpp

Go to the documentation of this file.

/*
 * $Id: AUD_DoubleReader.cpp 35141 2011-02-25 10:21:56Z jesterking $
 *
 * ***** 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_DoubleReader.h"

#include <cstring>

static const char* specs_error = "AUD_DoubleReader: Both readers have to have "
                                                                 "the same specs.";

AUD_DoubleReader::AUD_DoubleReader(AUD_IReader* reader1,
                                                                   AUD_IReader* reader2) :
                m_reader1(reader1), m_reader2(reader2), m_finished1(false)
{
        AUD_Specs s1, s2;
        s1 = reader1->getSpecs();
        s2 = reader2->getSpecs();
        if(memcmp(&s1, &s2, sizeof(AUD_Specs)) != 0)
        {
                delete reader1;
                delete reader2;
                AUD_THROW(AUD_ERROR_SPECS, specs_error);
        }
}

AUD_DoubleReader::~AUD_DoubleReader()
{
        delete m_reader1;
        delete m_reader2;
}

bool AUD_DoubleReader::isSeekable() const
{
        return m_reader1->isSeekable() && m_reader2->isSeekable();
}

void AUD_DoubleReader::seek(int position)
{
        m_reader1->seek(position);

        int pos1 = m_reader1->getPosition();

        if((m_finished1 = (pos1 < position)))
                m_reader2->seek(position - pos1);
        else
                m_reader2->seek(0);
}

int AUD_DoubleReader::getLength() const
{
        int len1 = m_reader1->getLength();
        int len2 = m_reader2->getLength();
        if(len1 < 0 || len2 < 0)
                return -1;
        return len1 + len2;
}

int AUD_DoubleReader::getPosition() const
{
        return m_reader1->getPosition() + m_reader2->getPosition();
}

AUD_Specs AUD_DoubleReader::getSpecs() const
{
        return m_reader1->getSpecs();
}

void AUD_DoubleReader::read(int & length, sample_t* & buffer)
{
        if(!m_finished1)
        {
                int len = length;
                m_reader1->read(len, buffer);

                if(len < length)
                {
                        AUD_Specs specs = m_reader1->getSpecs();
                        int samplesize = AUD_SAMPLE_SIZE(specs);

                        if(m_buffer.getSize() < length * samplesize)
                                m_buffer.resize(length * samplesize);

                        sample_t* buf = buffer;
                        buffer = m_buffer.getBuffer();

                        memcpy(buffer, buf, len * samplesize);

                        len = length - len;
                        length -= len;
                        m_reader2->read(len, buf);

                        memcpy(buffer + length * specs.channels, buf,
                                   len * samplesize);

                        length += len;

                        m_finished1 = true;
                }
        }
        else
        {
                m_reader2->read(length, buffer);
        }
}