AUD_SRCResampleReader.cpp

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/*
 * $Id: AUD_SRCResampleReader.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_SRCResampleReader.h"

#include <cmath>
#include <cstring>
#include <cstdio>

static long src_callback(void *cb_data, float **data)
{
        return ((AUD_SRCResampleReader*)cb_data)->doCallback(data);
}

static const char* state_error = "AUD_SRCResampleReader: SRC State couldn't be "
                                                                 "created.";

AUD_SRCResampleReader::AUD_SRCResampleReader(AUD_IReader* reader,
                                                                                         AUD_Specs specs) :
                AUD_EffectReader(reader),
                m_sspecs(reader->getSpecs()),
                m_factor(double(specs.rate) / double(m_sspecs.rate)),
                m_tspecs(specs),
                m_position(0)
{
        m_tspecs.channels = m_sspecs.channels;

        int error;
        m_src = src_callback_new(src_callback,
                                                         SRC_SINC_MEDIUM_QUALITY,
                                                         m_sspecs.channels,
                                                         &error,
                                                         this);

        if(!m_src)
        {
                // XXX printf("%s\n", src_strerror(error));
                AUD_THROW(AUD_ERROR_SRC, state_error);
        }
}

AUD_SRCResampleReader::~AUD_SRCResampleReader()
{
        src_delete(m_src);
}

long AUD_SRCResampleReader::doCallback(float** data)
{
        int length = m_buffer.getSize() / AUD_SAMPLE_SIZE(m_tspecs);
        sample_t* buffer;

        m_reader->read(length, buffer);

        *data = buffer;
        return length;
}

void AUD_SRCResampleReader::seek(int position)
{
        m_reader->seek(position / m_factor);
        src_reset(m_src);
        m_position = position;
}

int AUD_SRCResampleReader::getLength() const
{
        return m_reader->getLength() * m_factor;
}

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

AUD_Specs AUD_SRCResampleReader::getSpecs() const
{
        return m_tspecs;
}

void AUD_SRCResampleReader::read(int & length, sample_t* & buffer)
{
        int size = length * AUD_SAMPLE_SIZE(m_tspecs);

        if(m_buffer.getSize() < size)
                m_buffer.resize(size);

        buffer = m_buffer.getBuffer();

        length = src_callback_read(m_src, m_factor, length, buffer);

        m_position += length;
}