AUD_SuperposeReader.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_SuperposeReader.h"

#include <cstring>

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

AUD_SuperposeReader::AUD_SuperposeReader(AUD_Reference<AUD_IReader> reader1, AUD_Reference<AUD_IReader> reader2) :
    m_reader1(reader1), m_reader2(reader2)
{
}

AUD_SuperposeReader::~AUD_SuperposeReader()
{
}

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

void AUD_SuperposeReader::seek(int position)
{
    m_reader1->seek(position);
    m_reader2->seek(position);
}

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

int AUD_SuperposeReader::getPosition() const
{
    int pos1 = m_reader1->getPosition();
    int pos2 = m_reader2->getPosition();
    return AUD_MAX(pos1, pos2);
}

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

void AUD_SuperposeReader::read(int& length, bool& eos, sample_t* buffer)
{
    AUD_Specs specs = m_reader1->getSpecs();
    AUD_Specs s2 = m_reader2->getSpecs();
    if(!AUD_COMPARE_SPECS(specs, s2))
        AUD_THROW(AUD_ERROR_SPECS, specs_error);

    int samplesize = AUD_SAMPLE_SIZE(specs);

    m_buffer.assureSize(length * samplesize);

    int len1 = length;
    m_reader1->read(len1, eos, buffer);

    if(len1 < length)
        memset(buffer + len1 * specs.channels, 0, (length - len1) * samplesize);

    int len2 = length;
    bool eos2;
    sample_t* buf = m_buffer.getBuffer();
    m_reader2->read(len2, eos2, buf);

    for(int i = 0; i < len2 * specs.channels; i++)
        buffer[i] += buf[i];

    length = AUD_MAX(len1, len2);
    eos &= eos2;
}