src/plugins/Output/alsa/outputalsa.cpp



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/***************************************************************************
 *   Copyright (C) 2006-2017 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() : m_inited(false)
{
    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());
    pcm_handle = 0;
    m_prebuf = 0;
    m_prebuf_size = 0;
    m_prebuf_fill = 0;
    m_can_pause = false;
    m_chunk_size = 0;
#if (SND_LIB_VERSION >= 0x01001B)
    m_alsa_channels[SND_CHMAP_NA] =   Qmmp::CHAN_NULL;
    m_alsa_channels[SND_CHMAP_MONO] = Qmmp::CHAN_FRONT_CENTER;
    m_alsa_channels[SND_CHMAP_FL]   = Qmmp::CHAN_FRONT_LEFT;
    m_alsa_channels[SND_CHMAP_FR]   = Qmmp::CHAN_FRONT_RIGHT;
    m_alsa_channels[SND_CHMAP_RL]   = Qmmp::CHAN_REAR_LEFT;
    m_alsa_channels[SND_CHMAP_RR]   = Qmmp::CHAN_REAR_RIGHT;
    m_alsa_channels[SND_CHMAP_FC]   = Qmmp::CHAN_FRONT_CENTER;
    m_alsa_channels[SND_CHMAP_LFE]  = Qmmp::CHAN_LFE;
    m_alsa_channels[SND_CHMAP_SL]   = Qmmp::CHAN_SIDE_LEFT;
    m_alsa_channels[SND_CHMAP_SR]   = Qmmp::CHAN_SIDE_RIGHT;
    m_alsa_channels[SND_CHMAP_RC]   = Qmmp::CHAN_REAR_CENTER;
#endif
}

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 = 0;
    snd_pcm_sw_params_t *swparams = 0;
    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;
    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, 0)) < 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 ,0)) < 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 ,0)) < 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;
    }
    if ((err = snd_pcm_hw_params_get_period_size(hwparams, &period_size, 0)) < 0)
    {
        qWarning("OutputALSA: Error reading period size: %s", snd_strerror(err));
        return false;
    }
    //swparams
    snd_pcm_sw_params_alloca(&swparams);
    snd_pcm_sw_params_current(pcm_handle, swparams);
    if ((err = snd_pcm_sw_params_set_start_threshold(pcm_handle, swparams,
               buffer_size - period_size)) < 0)
        qWarning("OutputALSA: Error setting threshold: %s", snd_strerror(err));
    if ((err = snd_pcm_sw_params(pcm_handle, swparams)) < 0)
    {
        qWarning("OutputALSA: Error setting SW params: %s", snd_strerror(err));
        return false;
    }
    //setup needed values
    m_chunk_size = period_size;
    m_can_pause = snd_pcm_hw_params_can_pause(hwparams) && use_pause;
    qDebug("OutputALSA: can pause: %d", m_can_pause);

    ChannelMap out_map = map;
#if (SND_LIB_VERSION >= 0x01001B)
    //channel map configuration
    snd_pcm_chmap_t *chmap = snd_pcm_get_chmap(pcm_handle);
    if(chmap)
    {
        out_map.clear();
        char tmp[256];
        memset(tmp,0,256);
        snd_pcm_chmap_print(chmap, 256, tmp);
        qDebug("OutputALSA: received channel map: %s",tmp);

        for(uint i = 0; i < chmap->channels; ++i)
        {
            if(m_alsa_channels.keys().contains(chmap->pos[i]))
                out_map.append(m_alsa_channels.value(chmap->pos[i]));
            else
                out_map.append(Qmmp::CHAN_NULL);
        }
        free(chmap);
    }
    else
        qWarning("OutputALSA: Unable to receive current channel map");
#endif
    configure(exact_rate, out_map, format); //apply configuration
    //create alsa prebuffer;
    m_prebuf_size = 2 * snd_pcm_frames_to_bytes(pcm_handle, m_chunk_size); //buffer for two periods
    m_prebuf = (uchar *)malloc(m_prebuf_size);
    m_inited = true;
    return true;
}

qint64 OutputALSA::latency()
{
    snd_pcm_sframes_t delay = 0;
    snd_pcm_delay(pcm_handle, &delay);
    delay = qBound(3000L, delay, 30000L); //filter out possible invalid values
    return m_prebuf_fill * 1000 / sampleRate() / channels() / sampleSize() + delay * 1000 / sampleRate();
}

void OutputALSA::drain()
{
    long m = 0;
    snd_pcm_uframes_t l = snd_pcm_bytes_to_frames(pcm_handle, m_prebuf_fill);
    while (l > 0)
    {
        if ((m = alsa_write(m_prebuf, l)) >= 0)
        {
            l -= m;
            m = snd_pcm_frames_to_bytes(pcm_handle, m); // convert frames to bytes
            m_prebuf_fill -= m;
            memmove(m_prebuf, m_prebuf + m, m_prebuf_fill);
        }
        else
            break;
    }
    snd_pcm_nonblock(pcm_handle, 0);
    snd_pcm_drain(pcm_handle);
    snd_pcm_nonblock(pcm_handle, 1);
}

void OutputALSA::reset()
{
    m_prebuf_fill = 0;
    snd_pcm_drop(pcm_handle);
    snd_pcm_prepare(pcm_handle);
}

void OutputALSA::suspend()
{
    if (m_can_pause)
        snd_pcm_pause(pcm_handle, 1);
    snd_pcm_prepare(pcm_handle);
}

void OutputALSA::resume()
{
    if (m_can_pause)
        snd_pcm_pause(pcm_handle, 0);
    snd_pcm_prepare(pcm_handle);
}

qint64 OutputALSA::writeAudio(unsigned char *data, qint64 maxSize)
{
    if((maxSize = qMin(maxSize, m_prebuf_size - m_prebuf_fill)) > 0)
    {
        memmove(m_prebuf + m_prebuf_fill, data, maxSize);
        m_prebuf_fill += maxSize;
    }

    snd_pcm_uframes_t l = snd_pcm_bytes_to_frames(pcm_handle, m_prebuf_fill);

    while (l >= m_chunk_size)
    {
        snd_pcm_wait(pcm_handle, 10);
        long m;
        if ((m = alsa_write(m_prebuf, m_chunk_size)) >= 0)
        {
            l -= m;
            m = snd_pcm_frames_to_bytes(pcm_handle, m); // convert frames to bytes
            m_prebuf_fill -= m;
            memmove(m_prebuf, m_prebuf + m, m_prebuf_fill); //move data to begin
        }
        else
            return -1;
    }
    return maxSize;
}

long OutputALSA::alsa_write(unsigned char *data, long size)
{
    long m = snd_pcm_avail_update(pcm_handle);
    if(m >= 0 && m < size)
    {
        snd_pcm_wait(pcm_handle, 500);
        return 0;
    }

    if (m_use_mmap)
        m = snd_pcm_mmap_writei (pcm_handle, data, size);
    else
        m = snd_pcm_writei (pcm_handle, data, size);

    if (m == -EAGAIN)
    {
        snd_pcm_wait(pcm_handle, 500);
        return 0;
    }