/*
 * This file is part of sidplayfp, a console SID player.
 *
 * Copyright 2013-2016 Leandro Nini
 * Copyright 2008 Antti Lankila
 *
 * This program 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "audiodrv.h"

#ifdef HAVE_PULSE

#include <new>
#include <pulse/error.h>

Audio_Pulse::Audio_Pulse() :
    AudioBase("PULSE")
{
    outOfOrder();
}

Audio_Pulse::~Audio_Pulse()
{
    close ();
}

void Audio_Pulse::outOfOrder()
{
    _sampleBuffer = nullptr;
    clearError();
}

bool Audio_Pulse::open(AudioConfig &cfg)
{
    pa_sample_spec pacfg = {};

    pacfg.channels = cfg.channels;
    pacfg.rate = cfg.frequency;
    pacfg.format = PA_SAMPLE_S16NE;

    // Set sample precision and type of encoding.
    int err;
    _audioHandle = pa_simple_new(
        nullptr,
        "sidplayfp",
        PA_STREAM_PLAYBACK,
        nullptr,
        "sidplayfp",
        &pacfg,
        nullptr,
        nullptr,
        &err
    );

    try
    {
        if (! _audioHandle) {
            throw error(pa_strerror(err));
        }

        try
        {
            _sampleBuffer = new short[cfg.bufSize * cfg.channels];
        }
        catch (std::bad_alloc const &ba)
        {
            throw error("Unable to allocate memory for sample buffers.");
        }

        m_frameSize = 2 * cfg.channels;

        // Force precision
        cfg.precision = 16;
        _settings = cfg;
        return true;
    }
    catch(error const  &e)
    {
        setError(e.message());

        if (_audioHandle)
            pa_simple_free(_audioHandle);
        _audioHandle = nullptr;

        return false;
    }
}

// Close an opened audio device, free any allocated buffers and
// reset any variables that reflect the current state.
void Audio_Pulse::close()
{
    if (_audioHandle != nullptr)
    {
        pa_simple_free(_audioHandle);
        _audioHandle = nullptr;
    }

    if (_sampleBuffer != nullptr)
    {
        delete [] _sampleBuffer;
        outOfOrder ();
    }
}

bool Audio_Pulse::write(uint_least32_t frames)
{
    if (_audioHandle == nullptr)
    {
        setError("Device not open.");
        return false;
    }

    int err;
    size_t const bytes = static_cast<size_t>(frames) * m_frameSize;
    if (pa_simple_write(_audioHandle, _sampleBuffer, bytes, &err) < 0)
    {
        setError(pa_strerror(err));
        return false;
    }
    return true;
}

#endif // HAVE_PULSE
