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

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

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

**

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

**

** $QT_BEGIN_LICENSE:LGPL$

** 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

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

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** $QT_END_LICENSE$

**

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

//

//  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 "qaudiodeviceinfo_alsa_p.h"

#include <alsa/version.h>

QT_BEGIN_NAMESPACE

QAudioDeviceInfoInternal::QAudioDeviceInfoInternal(QByteArray dev, QAudio::Mode mode)

{

    handle = 0;

    device = QLatin1String(dev);

    this->mode = mode;

}

QAudioDeviceInfoInternal::~QAudioDeviceInfoInternal()

{

    close();

}

bool QAudioDeviceInfoInternal::isFormatSupported(const QAudioFormat& format) const

{

    return testSettings(format);

}

QAudioFormat QAudioDeviceInfoInternal::preferredFormat() const

{

    QAudioFormat nearest;

    if(mode == QAudio::AudioOutput) {

        nearest.setFrequency(44100);

        nearest.setChannels(2);

        nearest.setByteOrder(QAudioFormat::LittleEndian);

        nearest.setSampleType(QAudioFormat::SignedInt);

        nearest.setSampleSize(16);

        nearest.setCodec(QLatin1String("audio/pcm"));

    } else {

        nearest.setFrequency(8000);

        nearest.setChannels(1);

        nearest.setSampleType(QAudioFormat::UnSignedInt);

        nearest.setSampleSize(8);

        nearest.setCodec(QLatin1String("audio/pcm"));

        if(!testSettings(nearest)) {

            nearest.setChannels(2);

            nearest.setSampleSize(16);

            nearest.setSampleType(QAudioFormat::SignedInt);

        }

    }

    return nearest;

}

QAudioFormat QAudioDeviceInfoInternal::nearestFormat(const QAudioFormat& format) const

{

    if(testSettings(format))

        return format;

    else

        return preferredFormat();

}

QString QAudioDeviceInfoInternal::deviceName() const

{

    return device;

}

QStringList QAudioDeviceInfoInternal::codecList()

{

    updateLists();

    return codecz;

}

QList<int> QAudioDeviceInfoInternal::frequencyList()

{

    updateLists();

    return freqz;

}

QList<int> QAudioDeviceInfoInternal::channelsList()

{

    updateLists();

    return channelz;

}

QList<int> QAudioDeviceInfoInternal::sampleSizeList()

{

    updateLists();

    return sizez;

}

QList<QAudioFormat::Endian> QAudioDeviceInfoInternal::byteOrderList()

{

    updateLists();

    return byteOrderz;

}

QList<QAudioFormat::SampleType> QAudioDeviceInfoInternal::sampleTypeList()

{

    updateLists();

    return typez;

}

bool QAudioDeviceInfoInternal::open()

{

    int err = 0;

    QString dev = device;

    QList<QByteArray> devices = availableDevices(mode);

    if(dev.compare(QLatin1String("default")) == 0) {

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

        dev = QLatin1String(devices.first().constData());

#else

        dev = QLatin1String("hw:0,0");

#endif

    } else {

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

        dev = device;

#else

        int idx = 0;

        char *name;

        QString shortName = device.mid(device.indexOf(QLatin1String("="),0)+1);

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

            if(dev.contains(QLatin1String(name)))

                break;

            idx++;

	}

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

#endif

    }

    if(mode == QAudio::AudioOutput) {

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

    } else {

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

    }

    if(err < 0) {

        handle = 0;

        return false;

    }

    return true;

}

void QAudioDeviceInfoInternal::close()

{

    if(handle)

        snd_pcm_close(handle);

    handle = 0;

}

bool QAudioDeviceInfoInternal::testSettings(const QAudioFormat& format) const

{

    // Set nearest to closest settings that do work.

    // See if what is in settings will work (return value).

    int err = 0;

    snd_pcm_t* handle;

    snd_pcm_hw_params_t *params;

    QString dev = device;

    QList<QByteArray> devices = QAudioDeviceInfoInternal::availableDevices(QAudio::AudioOutput);

    if(dev.compare(QLatin1String("default")) == 0) {

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

        dev = QLatin1String(devices.first().constData());

#else

        dev = QLatin1String("hw:0,0");

#endif

    } else {

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

        dev = device;

#else

        int idx = 0;

        char *name;

        QString shortName = device.mid(device.indexOf(QLatin1String("="),0)+1);

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

            if(shortName.compare(QLatin1String(name)) == 0)

                break;

            idx++;

        }

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

#endif

    }

    if(mode == QAudio::AudioOutput) {

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

    } else {

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

    }

    if(err < 0) {

        handle = 0;

        return false;

    }

    bool testChannel = false;

    bool testCodec = false;

    bool testFreq = false;

    bool testType = false;

    bool testSize = false;

    int  dir = 0;

    snd_pcm_nonblock( handle, 0 );

    snd_pcm_hw_params_alloca( &params );

    snd_pcm_hw_params_any( handle, params );

    // set the values!

    snd_pcm_hw_params_set_channels(handle,params,format.channels());

    snd_pcm_hw_params_set_rate(handle,params,format.frequency(),dir);

    switch(format.sampleSize()) {

        case 8:

            if(format.sampleType() == QAudioFormat::SignedInt)

                snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S8);

            else if(format.sampleType() == QAudioFormat::UnSignedInt)

                snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U8);

            break;

        case 16:

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

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

                    snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S16_LE);

                else if(format.byteOrder() == QAudioFormat::BigEndian)

                    snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S16_BE);

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

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

                    snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U16_LE);

                else if(format.byteOrder() == QAudioFormat::BigEndian)

                    snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U16_BE);

            }

            break;

        case 32:

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

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

                    snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S32_LE);

                else if(format.byteOrder() == QAudioFormat::BigEndian)

                    snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S32_BE);

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

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

                    snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U32_LE);

                else if(format.byteOrder() == QAudioFormat::BigEndian)

                    snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U32_BE);

            }

    }

    // For now, just accept only audio/pcm codec

    if(!format.codec().startsWith(QLatin1String("audio/pcm"))) {

        err=-1;

    } else

        testCodec = true;

    if(err>=0 && format.channels() != -1) {

        err = snd_pcm_hw_params_test_channels(handle,params,format.channels());

        if(err>=0)

            err = snd_pcm_hw_params_set_channels(handle,params,format.channels());

        if(err>=0)

            testChannel = true;

    }

    if(err>=0 && format.frequency() != -1) {

        err = snd_pcm_hw_params_test_rate(handle,params,format.frequency(),0);

        if(err>=0)

            err = snd_pcm_hw_params_set_rate(handle,params,format.frequency(),dir);

        if(err>=0)

            testFreq = true;

    }

    if((err>=0 && format.sampleSize() != -1) &&

            (format.sampleType() != QAudioFormat::Unknown)) {

        switch(format.sampleSize()) {

            case 8:

                if(format.sampleType() == QAudioFormat::SignedInt)

                    err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S8);

                else if(format.sampleType() == QAudioFormat::UnSignedInt)

                    err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U8);

                break;

            case 16:

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

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

                        err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S16_LE);

                    else if(format.byteOrder() == QAudioFormat::BigEndian)

                        err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S16_BE);

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

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

                        err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U16_LE);

                    else if(format.byteOrder() == QAudioFormat::BigEndian)

                        err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U16_BE);

                }

                break;

            case 32:

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

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

                        err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S32_LE);

                    else if(format.byteOrder() == QAudioFormat::BigEndian)

                        err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_S32_BE);

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

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

                        err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U32_LE);

                    else if(format.byteOrder() == QAudioFormat::BigEndian)

                        err = snd_pcm_hw_params_set_format(handle,params,SND_PCM_FORMAT_U32_BE);

                }

        }

        if(err>=0) {

            testSize = true;

            testType = true;

        }

    }

    if(err>=0)

        err = snd_pcm_hw_params(handle, params);

    if(err == 0) {

        // settings work

        // close()

        if(handle)

            snd_pcm_close(handle);

        return true;

    }

    if(handle)

        snd_pcm_close(handle);

    return false;

}

void QAudioDeviceInfoInternal::updateLists()

{

    // redo all lists based on current settings

    freqz.clear();

    channelz.clear();

    sizez.clear();

    byteOrderz.clear();

    typez.clear();

    codecz.clear();

    if(!handle)

        open();

    if(!handle)

        return;

    for(int i=0; i<(int)MAX_SAMPLE_RATES; i++) {

        //if(snd_pcm_hw_params_test_rate(handle, params, SAMPLE_RATES[i], dir) == 0)

        freqz.append(SAMPLE_RATES[i]);

    }

    channelz.append(1);

    channelz.append(2);

    sizez.append(8);

    sizez.append(16);

    sizez.append(32);

    byteOrderz.append(QAudioFormat::LittleEndian);

    byteOrderz.append(QAudioFormat::BigEndian);

    typez.append(QAudioFormat::SignedInt);

    typez.append(QAudioFormat::UnSignedInt);

    typez.append(QAudioFormat::Float);

    codecz.append(QLatin1String("audio/pcm"));

    close();

}

QList<QByteArray> QAudioDeviceInfoInternal::availableDevices(QAudio::Mode mode)

{

    QList<QByteArray> allDevices;

    QList<QByteArray> devices;

    QByteArray filter;

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

    // Create a list of all current audio devices that support mode

    void **hints, **n;

    char *name, *descr, *io;

    if(snd_device_name_hint(-1, "pcm", &hints) < 0) {

        qWarning() << "no alsa devices available";

        return devices;

    }

    n = hints;

    if(mode == QAudio::AudioInput) {

        filter = "Input";

    } else {

        filter = "Output";

    }

    while (*n != NULL) {

        name = snd_device_name_get_hint(*n, "NAME");

        descr = snd_device_name_get_hint(*n, "DESC");

        io = snd_device_name_get_hint(*n, "IOID");

        if((name != NULL) && (descr != NULL) && ((io == NULL) || (io == filter))) {

            QString deviceName = QLatin1String(name);

            QString deviceDescription = QLatin1String(descr);

            allDevices.append(deviceName.toLocal8Bit().constData());

            if(deviceDescription.contains(QLatin1String("Default Audio Device")))

                devices.append(deviceName.toLocal8Bit().constData());

        }

        if(name != NULL)

            free(name);

        if(descr != NULL)

            free(descr);

        if(io != NULL)

            free(io);

        ++n;

    }

    snd_device_name_free_hint(hints);

    if(devices.size() > 0) {

        devices.append("default");

    }

#else

    int idx = 0;

    char* name;

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

        devices.append(name);

        idx++;

    }

    if (idx > 0)

        devices.append("default");

#endif

    if (devices.size() == 0 && allDevices.size() > 0)

        return allDevices;

    return devices;

}

QByteArray QAudioDeviceInfoInternal::defaultInputDevice()

{

    QList<QByteArray> devices = availableDevices(QAudio::AudioInput);

    if(devices.size() == 0)

        return QByteArray();

    return devices.first();

}

QByteArray QAudioDeviceInfoInternal::defaultOutputDevice()

{

    QList<QByteArray> devices = availableDevices(QAudio::AudioOutput);

    if(devices.size() == 0)

        return QByteArray();

    return devices.first();

}

QT_END_NAMESPACE