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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 "qaudiooutput_win32_p.h"

//#define DEBUG_AUDIO 1

QT_BEGIN_NAMESPACE

static CRITICAL_SECTION waveOutCriticalSection;

static const int minimumIntervalTime = 50;

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

    settings(audioFormat)

{

    bytesAvailable = 0;

    buffer_size = 0;

    period_size = 0;

    m_device = device;

    totalTimeValue = 0;

    intervalTime = 1000;

    audioBuffer = 0;

    errorState = QAudio::NoError;

    deviceState = QAudio::StoppedState;

    audioSource = 0;

    pullMode = true;

    finished = false;

    InitializeCriticalSection(&waveOutCriticalSection);

}

QAudioOutputPrivate::~QAudioOutputPrivate()

{

    EnterCriticalSection(&waveOutCriticalSection);

    finished = true;

    LeaveCriticalSection(&waveOutCriticalSection);

    close();

    DeleteCriticalSection(&waveOutCriticalSection);

}

void CALLBACK QAudioOutputPrivate::waveOutProc( HWAVEOUT hWaveOut, UINT uMsg,

        DWORD dwInstance, DWORD dwParam1, DWORD dwParam2 )

{

    Q_UNUSED(dwParam1)

    Q_UNUSED(dwParam2)

    Q_UNUSED(hWaveOut)

    QAudioOutputPrivate* qAudio;

    qAudio = (QAudioOutputPrivate*)(dwInstance);

    if(!qAudio)

        return;

    switch(uMsg) {

        case WOM_OPEN:

            qAudio->feedback();

            break;

        case WOM_CLOSE:

            return;

        case WOM_DONE:

            EnterCriticalSection(&waveOutCriticalSection);

            if(qAudio->finished || qAudio->buffer_size == 0 || qAudio->period_size == 0) {

                LeaveCriticalSection(&waveOutCriticalSection);

                return;

	    }

            qAudio->waveFreeBlockCount++;

            if(qAudio->waveFreeBlockCount >= qAudio->buffer_size/qAudio->period_size)

                qAudio->waveFreeBlockCount = qAudio->buffer_size/qAudio->period_size;

            qAudio->feedback();

            LeaveCriticalSection(&waveOutCriticalSection);

            break;

        default:

            return;

    }

}

WAVEHDR* QAudioOutputPrivate::allocateBlocks(int size, int count)

{

    int i;

    unsigned char* buffer;

    WAVEHDR* blocks;

    DWORD totalBufferSize = (size + sizeof(WAVEHDR))*count;

    if((buffer=(unsigned char*)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,

                    totalBufferSize)) == 0) {

        qWarning("QAudioOutput: Memory allocation error");

        return 0;

    }

    blocks = (WAVEHDR*)buffer;

    buffer += sizeof(WAVEHDR)*count;

    for(i = 0; i < count; i++) {

        blocks[i].dwBufferLength = size;

        blocks[i].lpData = (LPSTR)buffer;

        buffer += size;

    }

    return blocks;

}

void QAudioOutputPrivate::freeBlocks(WAVEHDR* blockArray)

{

    WAVEHDR* blocks = blockArray;

    int count = buffer_size/period_size;

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

        waveOutUnprepareHeader(hWaveOut,&blocks[i], sizeof(WAVEHDR));

        blocks+=sizeof(WAVEHDR);

    }

    HeapFree(GetProcessHeap(), 0, blockArray);

}

QAudioFormat QAudioOutputPrivate::format() const

{

    return settings;

}

QIODevice* QAudioOutputPrivate::start(QIODevice* device)

{

    if(deviceState != QAudio::StoppedState)

        close();

    if(!pullMode && audioSource) {

        delete audioSource;

    }

    if(device) {

        //set to pull mode

        pullMode = true;

        audioSource = device;

        deviceState = QAudio::ActiveState;

    } else {

        //set to push mode

        pullMode = false;

        audioSource = new OutputPrivate(this);

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

        deviceState = QAudio::IdleState;

    }

    if( !open() )

        return 0;

    emit stateChanged(deviceState);

    return audioSource;

}

void QAudioOutputPrivate::stop()

{

    if(deviceState == QAudio::StoppedState)

        return;

    close();

    if(!pullMode && audioSource) {

        delete audioSource;

        audioSource = 0;

    }

    emit stateChanged(deviceState);

}

bool QAudioOutputPrivate::open()

{

#ifdef DEBUG_AUDIO

    QTime now(QTime::currentTime());

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

#endif

    if(buffer_size == 0) {

        // Default buffer size, 200ms, default period size is 40ms

        buffer_size = settings.frequency()*settings.channels()*(settings.sampleSize()/8)*0.2;

	period_size = buffer_size/5;

    } else {

        period_size = buffer_size/5;

    }

    waveBlocks = allocateBlocks(period_size, buffer_size/period_size);

    EnterCriticalSection(&waveOutCriticalSection);

    waveFreeBlockCount = buffer_size/period_size;

    LeaveCriticalSection(&waveOutCriticalSection);

    waveCurrentBlock = 0;

    if(audioBuffer == 0)

        audioBuffer = new char[buffer_size];

    timeStamp.restart();

    elapsedTimeOffset = 0;

    wfx.nSamplesPerSec = settings.frequency();

    wfx.wBitsPerSample = settings.sampleSize();

    wfx.nChannels = settings.channels();

    wfx.cbSize = 0;

    wfx.wFormatTag = WAVE_FORMAT_PCM;

    wfx.nBlockAlign = (wfx.wBitsPerSample >> 3) * wfx.nChannels;

    wfx.nAvgBytesPerSec = wfx.nBlockAlign * wfx.nSamplesPerSec;

    UINT_PTR devId = WAVE_MAPPER;

    WAVEOUTCAPS woc;

    unsigned long iNumDevs,ii;

    iNumDevs = waveOutGetNumDevs();

    for(ii=0;ii<iNumDevs;ii++) {

        if(waveOutGetDevCaps(ii, &woc, sizeof(WAVEOUTCAPS))

	    == MMSYSERR_NOERROR) {

	    QString tmp;

	    tmp = QString::fromUtf16((const unsigned short*)woc.szPname);

            if(tmp.compare(QLatin1String(m_device)) == 0) {

	        devId = ii;

		break;

	    }

	}

    }

    if(waveOutOpen(&hWaveOut, devId, &wfx,

                (DWORD_PTR)&waveOutProc,

                (DWORD_PTR) this,

                CALLBACK_FUNCTION) != MMSYSERR_NOERROR) {

        errorState = QAudio::OpenError;

        deviceState = QAudio::StoppedState;

        emit stateChanged(deviceState);

        qWarning("QAudioOutput: open error");

        return false;

    }

    totalTimeValue = 0;

    timeStampOpened.restart();

    elapsedTimeOffset = 0;

    errorState = QAudio::NoError;

    if(pullMode) {

        deviceState = QAudio::ActiveState;

        QTimer::singleShot(10, this, SLOT(feedback()));

    } else

        deviceState = QAudio::IdleState;

    return true;

}

void QAudioOutputPrivate::close()

{

    if(deviceState == QAudio::StoppedState)

        return;

    deviceState = QAudio::StoppedState;

    int delay = (buffer_size-bytesFree())*1000/(settings.frequency()

                  *settings.channels()*(settings.sampleSize()/8));

    waveOutReset(hWaveOut);

    Sleep(delay+10);

    freeBlocks(waveBlocks);

    waveOutClose(hWaveOut);

    delete [] audioBuffer;

    audioBuffer = 0;

    buffer_size = 0;

}

int QAudioOutputPrivate::bytesFree() const

{

    int buf;

    buf = waveFreeBlockCount*period_size;

    return buf;

}

int QAudioOutputPrivate::periodSize() const

{

    return period_size;

}

void QAudioOutputPrivate::setBufferSize(int value)

{

    if(deviceState == QAudio::StoppedState)

        buffer_size = value;

}

int QAudioOutputPrivate::bufferSize() const

{

    return buffer_size;

}

void QAudioOutputPrivate::setNotifyInterval(int ms)

{

    if(ms >= minimumIntervalTime)

        intervalTime = ms;

    else

        intervalTime = minimumIntervalTime;

}

int QAudioOutputPrivate::notifyInterval() const

{

    return intervalTime;

}

qint64 QAudioOutputPrivate::processedUSecs() const

{

}

qint64 QAudioOutputPrivate::write( const char *data, qint64 len )

{

    // Write out some audio data

    char* p = (char*)data;

    int l = (int)len;

    WAVEHDR* current;

    int remain;

    current = &waveBlocks[waveCurrentBlock];

    while(l > 0) {

        EnterCriticalSection(&waveOutCriticalSection);

        if(waveFreeBlockCount==0) {

            LeaveCriticalSection(&waveOutCriticalSection);

            break;

        }

        LeaveCriticalSection(&waveOutCriticalSection);

        if(current->dwFlags & WHDR_PREPARED)

            waveOutUnprepareHeader(hWaveOut, current, sizeof(WAVEHDR));

        if(l < period_size)

            remain = l;

        else

            remain = period_size;

        memcpy(current->lpData, p, remain);

        l -= remain;

        p += remain;

        current->dwBufferLength = remain;

        waveOutPrepareHeader(hWaveOut, current, sizeof(WAVEHDR));

        waveOutWrite(hWaveOut, current, sizeof(WAVEHDR));

        EnterCriticalSection(&waveOutCriticalSection);

        waveFreeBlockCount--;

        LeaveCriticalSection(&waveOutCriticalSection);

#ifdef DEBUG_AUDIO

        EnterCriticalSection(&waveOutCriticalSection);

        qDebug("write out l=%d, waveFreeBlockCount=%d",

                current->dwBufferLength,waveFreeBlockCount);

        LeaveCriticalSection(&waveOutCriticalSection);

#endif

        waveCurrentBlock++;

        waveCurrentBlock %= buffer_size/period_size;

        current = &waveBlocks[waveCurrentBlock];

        current->dwUser = 0;

    }

    return (len-l);

}

void QAudioOutputPrivate::resume()

{

    if(deviceState == QAudio::SuspendedState) {

        deviceState = QAudio::ActiveState;

        errorState = QAudio::NoError;

        waveOutRestart(hWaveOut);

        QTimer::singleShot(10, this, SLOT(feedback()));

        emit stateChanged(deviceState);

    }

}

void QAudioOutputPrivate::suspend()

{

        waveOutPause(hWaveOut);

        deviceState = QAudio::SuspendedState;

        errorState = QAudio::NoError;

        emit stateChanged(deviceState);

    }

}

void QAudioOutputPrivate::feedback()

{

#ifdef DEBUG_AUDIO

    QTime now(QTime::currentTime());

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

#endif

    bytesAvailable = bytesFree();

    if(!(deviceState==QAudio::StoppedState||deviceState==QAudio::SuspendedState)) {

        if(bytesAvailable >= period_size)

            QMetaObject::invokeMethod(this, "deviceReady", Qt::QueuedConnection);

    }

}

bool QAudioOutputPrivate::deviceReady()

{

    if(pullMode) {

        int chunks = bytesAvailable/period_size;

#ifdef DEBUG_AUDIO

        qDebug()<<"deviceReady() avail="<<bytesAvailable<<" bytes, period size="<<period_size<<" bytes";

        qDebug()<<"deviceReady() no. of chunks that can fit ="<<chunks<<", chunks in bytes ="<<chunks*period_size;

#endif

        bool startup = false;

        if(totalTimeValue == 0)

	    startup = true;

	bool full=false;

	EnterCriticalSection(&waveOutCriticalSection);

	if(waveFreeBlockCount==0) full = true;

	LeaveCriticalSection(&waveOutCriticalSection);

	if (full){

#ifdef DEBUG_AUDIO

            qDebug() << "Skipping data as unable to write";

#endif

	    if((timeStamp.elapsed() + elapsedTimeOffset) > intervalTime ) {

                emit notify();

		elapsedTimeOffset = timeStamp.elapsed() + elapsedTimeOffset - intervalTime;

		timeStamp.restart();

	    }

	    return true;

	}

        if(startup)

	    waveOutPause(hWaveOut);

        int input = period_size*chunks;

        int l = audioSource->read(audioBuffer,input);

        if(l > 0) {

            int out= write(audioBuffer,l);

	    if(startup)

	        waveOutRestart(hWaveOut);

        } else if(l == 0) {

            bytesAvailable = bytesFree();

            int check = 0;

            EnterCriticalSection(&waveOutCriticalSection);

            check = waveFreeBlockCount;

            LeaveCriticalSection(&waveOutCriticalSection);

            if(check == buffer_size/period_size) {

                errorState = QAudio::UnderrunError;

            }

        } else if(l < 0) {

            bytesAvailable = bytesFree();

            errorState = QAudio::IOError;

        }