/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the QtMultimedia module of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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****************************************************************************/

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists for the convenience

// of other Qt classes.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtCore/qcoreapplication.h>

#include "qaudioinput_alsa_p.h"

QT_BEGIN_NAMESPACE

//#define DEBUG_AUDIO 1

static const int minimumIntervalTime = 50;

QAudioInputPrivate::QAudioInputPrivate(const QByteArray &device, const QAudioFormat& audioFormat):

    settings(audioFormat)

{

    bytesAvailable = 0;

    handle = 0;

    ahandler = 0;

    access = SND_PCM_ACCESS_RW_INTERLEAVED;

    pcmformat = SND_PCM_FORMAT_S16;

    buffer_size = 0;

    period_size = 0;

    buffer_time = 100000;

    period_time = 20000;

    totalTimeValue = 0;

    intervalTime = 1000;

    audioBuffer = 0;

    errorState = QAudio::NoError;

    deviceState = QAudio::StopState;

    audioSource = 0;

    pullMode = true;

    resuming = false;

    QStringList list1 = QString(QLatin1String(device)).split(QLatin1String(":"));

    m_device = QByteArray(list1.at(0).toLocal8Bit().constData());

    timer = new QTimer(this);

    connect(timer,SIGNAL(timeout()),SLOT(userFeed()));

}

QAudioInputPrivate::~QAudioInputPrivate()

{

    close();

    disconnect(timer, SIGNAL(timeout()));

    QCoreApplication::processEvents();

    delete timer;

}

QAudio::Error QAudioInputPrivate::error() const

{

    return errorState;

}

QAudio::State QAudioInputPrivate::state() const

{

    return deviceState;

}

QAudioFormat QAudioInputPrivate::format() const

{

    return settings;

}

int QAudioInputPrivate::xrun_recovery(int err)

{

    int  count = 0;

    bool reset = false;

    if(err == -EPIPE) {

        errorState = QAudio::UnderrunError;

        err = snd_pcm_prepare(handle);

        if(err < 0)

            reset = true;

    } else if((err == -ESTRPIPE)||(err == -EIO)) {

        errorState = QAudio::IOError;

        while((err = snd_pcm_resume(handle)) == -EAGAIN){

            usleep(100);

            count++;

            if(count > 5) {

                reset = true;

                break;

            }

        }

        if(err < 0) {

            err = snd_pcm_prepare(handle);

            if(err < 0)

                reset = true;

        }

    }

    if(reset) {

        close();

        open();

        snd_pcm_prepare(handle);

        return 0;

    }

    return err;

}

int QAudioInputPrivate::setFormat()

{

    snd_pcm_format_t format = SND_PCM_FORMAT_S16;

    if(settings.sampleSize() == 8) {

        format = SND_PCM_FORMAT_U8;

    } else if(settings.sampleSize() == 16) {

        if(settings.sampleType() == QAudioFormat::SignedInt) {

            if(settings.byteOrder() == QAudioFormat::LittleEndian)

                format = SND_PCM_FORMAT_S16_LE;

            else

                format = SND_PCM_FORMAT_S16_BE;

        } else if(settings.sampleType() == QAudioFormat::UnSignedInt) {

            if(settings.byteOrder() == QAudioFormat::LittleEndian)

                format = SND_PCM_FORMAT_U16_LE;

            else

                format = SND_PCM_FORMAT_U16_BE;

        }

    } else if(settings.sampleSize() == 24) {

        if(settings.sampleType() == QAudioFormat::SignedInt) {

            if(settings.byteOrder() == QAudioFormat::LittleEndian)

                format = SND_PCM_FORMAT_S24_LE;

            else

                format = SND_PCM_FORMAT_S24_BE;

        } else if(settings.sampleType() == QAudioFormat::UnSignedInt) {

            if(settings.byteOrder() == QAudioFormat::LittleEndian)

                format = SND_PCM_FORMAT_U24_LE;

            else

                format = SND_PCM_FORMAT_U24_BE;

        }

    } else if(settings.sampleSize() == 32) {

        if(settings.sampleType() == QAudioFormat::SignedInt) {

            if(settings.byteOrder() == QAudioFormat::LittleEndian)

                format = SND_PCM_FORMAT_S32_LE;

            else

                format = SND_PCM_FORMAT_S32_BE;

        } else if(settings.sampleType() == QAudioFormat::UnSignedInt) {

            if(settings.byteOrder() == QAudioFormat::LittleEndian)

                format = SND_PCM_FORMAT_U32_LE;

            else

                format = SND_PCM_FORMAT_U32_BE;

        } else if(settings.sampleType() == QAudioFormat::Float) {

            if(settings.byteOrder() == QAudioFormat::LittleEndian)

                format = SND_PCM_FORMAT_FLOAT_LE;

            else

                format = SND_PCM_FORMAT_FLOAT_BE;

        }

    } else if(settings.sampleSize() == 64) {

        if(settings.byteOrder() == QAudioFormat::LittleEndian)

            format = SND_PCM_FORMAT_FLOAT64_LE;

        else

            format = SND_PCM_FORMAT_FLOAT64_BE;

    }

    return snd_pcm_hw_params_set_format( handle, hwparams, format);

}

QIODevice* QAudioInputPrivate::start(QIODevice* device)

{

    if(deviceState != QAudio::StopState)

        close();

    if(!pullMode && audioSource) {

        delete audioSource;

    }

    if(device) {

        //set to pull mode

        pullMode = true;

        audioSource = device;

    } else {

        //set to push mode

        pullMode = false;

        audioSource = new InputPrivate(this);

        audioSource->open(QIODevice::ReadOnly | QIODevice::Unbuffered);

    }

    if( !open() )

        return 0;

    emit stateChanged(deviceState);

    return audioSource;

}

void QAudioInputPrivate::stop()

{

    if(deviceState == QAudio::StopState)

        return;

    deviceState = QAudio::StopState;

    close();

    emit stateChanged(deviceState);

}

bool QAudioInputPrivate::open()

{

#ifdef DEBUG_AUDIO

    QTime now(QTime::currentTime());

    qDebug()<<now.second()<<"s "<<now.msec()<<"ms :open()";

#endif

    clockStamp.restart();

    timeStamp.restart();

    elapsedTimeOffset = 0;

    int dir;

    int err=-1;

    int count=0;

    unsigned int freakuency=settings.frequency();

    QString dev = QString(QLatin1String(m_device.constData()));

    if(!dev.contains(QLatin1String("default"))) {

#if(SND_LIB_MAJOR == 1 && SND_LIB_MINOR == 0 && SND_LIB_SUBMINOR >= 14) 

        dev = QString(QLatin1String("default:CARD=%1")).arg(QLatin1String(m_device.constData()));

#else

        int idx = 0;

        char *name;

        while(snd_card_get_name(idx,&name) == 0) {

            if(m_device.contains(name))

                break;

            idx++;

        }

        dev = QString(QLatin1String("hw:%1,0")).arg(idx);

#endif

    }

    // Step 1: try and open the device

    while((count < 5) && (err < 0)) {

        err=snd_pcm_open(&handle,dev.toLocal8Bit().constData(),SND_PCM_STREAM_CAPTURE,0);

        if(err < 0)

            count++;

    }

    if (( err < 0)||(handle == 0)) {

        errorState = QAudio::OpenError;

        deviceState = QAudio::StopState;

        emit stateChanged(deviceState);

        return false;

    }

    snd_pcm_nonblock( handle, 0 );

    // Step 2: Set the desired HW parameters.

    snd_pcm_hw_params_alloca( &hwparams );

    bool fatal = false;

    QString errMessage;

    unsigned int chunks = 8;

    err = snd_pcm_hw_params_any( handle, hwparams );

    if ( err < 0 ) {

        fatal = true;

        errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_any: err = %1").arg(err);

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params_set_rate_resample( handle, hwparams, 1 );

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_rate_resample: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params_set_access( handle, hwparams, access );

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_access: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = setFormat();

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_format: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params_set_channels( handle, hwparams, (unsigned int)settings.channels() );

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_channels: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params_set_rate_near( handle, hwparams, &freakuency, 0 );

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_rate_near: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, &dir);

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_buffer_time_near: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, &dir);

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_period_time_near: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params_set_periods_near(handle, hwparams, &chunks, &dir);

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_periods_near: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params(handle, hwparams);

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params: err = %1").arg(err);

        }

    }

    if( err < 0) {

        qWarning()<<errMessage;

        errorState = QAudio::OpenError;

        deviceState = QAudio::StopState;

        emit stateChanged(deviceState);

        return false;

    }

    snd_pcm_hw_params_get_buffer_size(hwparams,&buffer_frames);

    buffer_size = snd_pcm_frames_to_bytes(handle,buffer_frames);

    snd_pcm_hw_params_get_period_size(hwparams,&period_frames, &dir);

    period_size = snd_pcm_frames_to_bytes(handle,period_frames);

    snd_pcm_hw_params_get_buffer_time(hwparams,&buffer_time, &dir);

    snd_pcm_hw_params_get_period_time(hwparams,&period_time, &dir);

    // Step 3: Set the desired SW parameters.

    snd_pcm_sw_params_t *swparams;

    snd_pcm_sw_params_alloca(&swparams);

    snd_pcm_sw_params_current(handle, swparams);

    snd_pcm_sw_params_set_start_threshold(handle,swparams,period_frames);

    snd_pcm_sw_params_set_stop_threshold(handle,swparams,buffer_frames);

    snd_pcm_sw_params_set_avail_min(handle, swparams,period_frames);

    snd_pcm_sw_params(handle, swparams);

    // Step 4: Prepare audio

    if(audioBuffer == 0)

        audioBuffer = new char[buffer_size];

    snd_pcm_prepare( handle );

    snd_pcm_start(handle);

    // Step 5: Setup timer

    bytesAvailable = bytesReady();

    if(pullMode)

        connect(audioSource,SIGNAL(readyRead()),this,SLOT(userFeed()));

    // Step 6: Start audio processing

    chunks = buffer_size/period_size;

    timer->start(period_time*chunks/2000);

    errorState  = QAudio::NoError;

    deviceState = QAudio::ActiveState;

    totalTimeValue = 0;

    return true;

}

void QAudioInputPrivate::close()

{

    deviceState = QAudio::StopState;

    timer->stop();

    if ( handle ) {

        snd_pcm_drop( handle );

        snd_pcm_close( handle );

        handle = 0;

        delete [] audioBuffer;

        audioBuffer=0;

    }

}

int QAudioInputPrivate::bytesReady() const

{

    if(resuming)

        return period_size;

    if(deviceState != QAudio::ActiveState)

        return 0;

    int frames = snd_pcm_avail_update(handle);

    if((int)frames > (int)buffer_frames)

        frames = buffer_frames;

    return snd_pcm_frames_to_bytes(handle, frames);

}

qint64 QAudioInputPrivate::read(char* data, qint64 len)

{

    Q_UNUSED(data)

    Q_UNUSED(len)

    // Read in some audio data and write it to QIODevice, pull mode

    if ( !handle )

        return 0;

    bytesAvailable = bytesReady();

    int count=0, err = 0;

    while(count < 5) {

        int chunks = bytesAvailable/period_size;

        int frames = chunks*period_frames;

        if(frames > (int)buffer_frames)

            frames = buffer_frames;

        int readFrames = snd_pcm_readi(handle, audioBuffer, frames);

        if (readFrames >= 0) {

            err = snd_pcm_frames_to_bytes(handle, readFrames);

#ifdef DEBUG_AUDIO

            qDebug()<<QString::fromLatin1("PULL: read in bytes = %1 (frames=%2)").arg(err).arg(readFrames).toLatin1().constData();

#endif

            break;

        } else if((readFrames == -EAGAIN) || (readFrames == -EINTR)) {

            errorState = QAudio::IOError;

            err = 0;

            break;

        } else {

            if(readFrames == -EPIPE) {

                errorState = QAudio::UnderrunError;

                err = snd_pcm_prepare(handle);

            } else if(readFrames == -ESTRPIPE) {

                err = snd_pcm_prepare(handle);

            }

            if(err != 0) break;

        }

        count++;

    }

    if(err > 0) {

        // got some send it onward

#ifdef DEBUG_AUDIO

        qDebug()<<"PULL: frames to write to QIODevice = "<<

            snd_pcm_bytes_to_frames( handle, (int)err )<<" ("<<err<<") bytes";

#endif

        if(deviceState != QAudio::ActiveState)

            return 0;

        qint64 l = audioSource->write(audioBuffer,err);

        if(l < 0) {

            close();

            errorState = QAudio::IOError;

            deviceState = QAudio::StopState;

            emit stateChanged(deviceState);

        } else if(l == 0) {

            errorState = QAudio::NoError;

            deviceState = QAudio::IdleState;

        } else {

            totalTimeValue += snd_pcm_bytes_to_frames(handle, err)*1000000/settings.frequency();

            resuming = false;

            errorState = QAudio::NoError;

            deviceState = QAudio::ActiveState;

        }

        return l;

    }

    return 0;

}

void QAudioInputPrivate::resume()

{

    if(deviceState == QAudio::SuspendState) {

        int err = 0;

        if(handle) {

            err = snd_pcm_prepare( handle );

            if(err < 0)

                xrun_recovery(err);

            err = snd_pcm_start(handle);

            if(err < 0)

                xrun_recovery(err);

            bytesAvailable = buffer_size;

        }

        resuming = true;

        deviceState = QAudio::ActiveState;

        int chunks = buffer_size/period_size;

        timer->start(buffer_time*chunks/2000);