src/plugins/Output/alsa/outputalsa.cpp



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/***************************************************************************
 *   Copyright (C) 2006-2021 by Ilya Kotov                                 *
 *   forkotov02@ya.ru                                                      *
 *                                                                         *
 *   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 <QSettings>
#include <QSocketNotifier>

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>
#include <qmmp/buffer.h>
#include <qmmp/visual.h>
#include <qmmp/statehandler.h>
#include "outputalsa.h"


OutputALSA::OutputALSA()
{
    QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
    QString dev_name = settings.value("ALSA/device","default").toString();
    m_use_mmap = settings.value("ALSA/use_mmap", false).toBool();
    pcm_name = strdup(dev_name.toLatin1().data());
    m_alsa_channels = {
        { SND_CHMAP_NA, Qmmp::CHAN_NULL },
        { SND_CHMAP_MONO, Qmmp::CHAN_FRONT_CENTER },
        { SND_CHMAP_FL, Qmmp::CHAN_FRONT_LEFT },
        { SND_CHMAP_FR, Qmmp::CHAN_FRONT_RIGHT },
        { SND_CHMAP_RL, Qmmp::CHAN_REAR_LEFT },
        { SND_CHMAP_RR, Qmmp::CHAN_REAR_RIGHT },
        { SND_CHMAP_FC, Qmmp::CHAN_FRONT_CENTER },
        { SND_CHMAP_LFE, Qmmp::CHAN_LFE },
        { SND_CHMAP_SL, Qmmp::CHAN_SIDE_LEFT },
        { SND_CHMAP_SR, Qmmp::CHAN_SIDE_RIGHT },
        { SND_CHMAP_RC, Qmmp::CHAN_REAR_CENTER }
    };
}

OutputALSA::~OutputALSA()
{
    uninitialize();
    free (pcm_name);
}

bool OutputALSA::initialize(quint32 freq, ChannelMap map, Qmmp::AudioFormat format)
{
    m_inited = false;

    if (pcm_handle)
        return false;

    if (snd_pcm_open(&pcm_handle, pcm_name, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0)
    {
        qWarning ("OutputALSA: Error opening PCM device %s", pcm_name);
        return false;
    }

    // we need to configure

    uint rate = freq; /* Sample rate */
    uint exact_rate = freq;   /* Sample rate returned by */

    /* load settings from config */
    QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
    settings.beginGroup("ALSA");
    uint buffer_time = settings.value("buffer_time",500).toUInt()*1000;
    uint period_time = settings.value("period_time",100).toUInt()*1000;
    bool use_pause =  settings.value("use_snd_pcm_pause", false).toBool();
    settings.endGroup();

    snd_pcm_hw_params_t *hwparams = nullptr;
    snd_pcm_sw_params_t *swparams = nullptr;
    int err; //alsa error code

    //hw params
    snd_pcm_hw_params_alloca(&hwparams);
    if ((err = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0)
    {
        qWarning("OutputALSA: Can not read configuration for PCM device: %s", snd_strerror(err));
        return false;
    }
    if (m_use_mmap)
    {
        if ((err = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0)
        {
            qWarning("OutputALSA: Error setting mmap access: %s", snd_strerror(err));
            m_use_mmap = false;
        }
    }
    if (!m_use_mmap)
    {
        if ((err = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
        {
            qWarning("OutputALSA: Error setting access: %s", snd_strerror(err));
            return false;
        }
    }
    snd_pcm_format_t alsa_format = SND_PCM_FORMAT_UNKNOWN;
    switch (format)
    {
    case Qmmp::PCM_S8:
        alsa_format = SND_PCM_FORMAT_S8;
        break;
    case Qmmp::PCM_S16LE:
        alsa_format = SND_PCM_FORMAT_S16_LE;
        break;
    case Qmmp::PCM_S24LE:
        alsa_format = SND_PCM_FORMAT_S24_LE;
        break;
    case Qmmp::PCM_S32LE:
        alsa_format = SND_PCM_FORMAT_S32_LE;
        break;
    case Qmmp::PCM_FLOAT:
        alsa_format = SND_PCM_FORMAT_FLOAT;
        break;
    default:
        qWarning("OutputALSA: unsupported format detected");
        return false;
    }
    if ((err = snd_pcm_hw_params_set_format(pcm_handle, hwparams, alsa_format)) < 0)
    {
        qDebug("OutputALSA: Error setting format: %s", snd_strerror(err));
        return false;
    }
    exact_rate = rate;

    if ((err = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &exact_rate, nullptr)) < 0)
    {
        qWarning("OutputALSA: Error setting rate: %s", snd_strerror(err));
        return false;
    }
    if (rate != exact_rate)
    {
        qWarning("OutputALSA: The rate %d Hz is not supported by your hardware.\n==> Using %d Hz instead.", rate, exact_rate);
        rate = exact_rate;
    }
    uint c = map.count();
    if ((err = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0)
    {
        qWarning("OutputALSA: Error setting channels: %s", snd_strerror(err));
        return false;
    }
    if (c != (uint)map.count())
    {
        qWarning("OutputALSA: The channel number %d is not supported by your hardware", map.count());
        qWarning("==> Using %d instead.", c);
    }
    if ((err = snd_pcm_hw_params_set_period_time_near(pcm_handle, hwparams, &period_time, nullptr)) < 0)
    {
        qWarning("OutputALSA: Error setting period time: %s", snd_strerror(err));
        return false;
    }
    if ((err = snd_pcm_hw_params_set_buffer_time_near(pcm_handle, hwparams, &buffer_time, nullptr)) < 0)
    {
        qWarning("OutputALSA: Error setting buffer time: %s", snd_strerror(err));
        return false;
    }
    if ((err = snd_pcm_hw_params(pcm_handle, hwparams)) < 0)
    {
        qWarning("OutputALSA: Error setting HW params: %s", snd_strerror(err));
        return false;
    }
    //read some alsa parameters
    snd_pcm_uframes_t buffer_size = 0;
    snd_pcm_uframes_t period_size = 0;
    if ((err = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size)) < 0)
    {
        qWarning("OutputALSA: Error reading buffer size: %s", snd_strerror(err));
        return false;