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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 "qaudioinput_win32_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;

    buffer_size = 0;

    period_size = 0;

    m_device = device;

    totalTimeValue = 0;

    intervalTime = 1000;

    errorState = QAudio::NoError;

    deviceState = QAudio::StoppedState;

    audioSource = 0;

    pullMode = true;

    resuming = false;

    finished = false;

    connect(this,SIGNAL(processMore()),SLOT(deviceReady()));

    InitializeCriticalSection(&waveInCriticalSection);

}

QAudioInputPrivate::~QAudioInputPrivate()

{

    stop();

    DeleteCriticalSection(&waveInCriticalSection);

}

void CALLBACK QAudioInputPrivate::waveInProc( HWAVEIN hWaveIn, UINT uMsg,

        DWORD dwInstance, DWORD dwParam1, DWORD dwParam2 )

{

    Q_UNUSED(dwParam1)

    Q_UNUSED(dwParam2)

    Q_UNUSED(hWaveIn)

    QAudioInputPrivate* qAudio;

    qAudio = (QAudioInputPrivate*)(dwInstance);

    if(!qAudio)

        return;

    switch(uMsg) {

        case WIM_OPEN:

            break;

        case WIM_DATA:

            if(qAudio->waveFreeBlockCount > 0)

                qAudio->waveFreeBlockCount--;

            qAudio->feedback();

            break;

        case WIM_CLOSE:

            qAudio->finished = true;

            break;

        default:

            return;

    }

}

WAVEHDR* QAudioInputPrivate::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("QAudioInput: 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;

        blocks[i].dwBytesRecorded=0;

        blocks[i].dwUser = 0L;

        blocks[i].dwFlags = 0L;

        blocks[i].dwLoops = 0L;

        result = waveInPrepareHeader(hWaveIn,&blocks[i], sizeof(WAVEHDR));

        if(result != MMSYSERR_NOERROR) {

            qWarning("QAudioInput: Can't prepare block %d",i);

            return 0;

        }

        buffer += size;

    }

    return blocks;

}

void QAudioInputPrivate::freeBlocks(WAVEHDR* blockArray)

{

    WAVEHDR* blocks = blockArray;

    int count = buffer_size/period_size;

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

        waveInUnprepareHeader(hWaveIn,&blocks[i], sizeof(WAVEHDR));

        blocks+=sizeof(WAVEHDR);

    }

    HeapFree(GetProcessHeap(), 0, blockArray);

}

QAudio::Error QAudioInputPrivate::error() const

{

    return errorState;

}

QAudio::State QAudioInputPrivate::state() const

{

    return deviceState;

}

QAudioFormat QAudioInputPrivate::format() const

{

    return settings;

}

QIODevice* QAudioInputPrivate::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;

        deviceState = QAudio::IdleState;

        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::StoppedState)

        return;

    close();

    emit stateChanged(deviceState);

}

bool QAudioInputPrivate::open()

{

#ifdef DEBUG_AUDIO

    QTime now(QTime::currentTime());

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

#endif

    header = 0;

    if(buffer_size == 0) {

	period_size = buffer_size/5;

    } else {

        period_size = buffer_size/5;

    }

    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;

    WAVEINCAPS wic;

    unsigned long iNumDevs,ii;

    iNumDevs = waveInGetNumDevs();

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

        if(waveInGetDevCaps(ii, &wic, sizeof(WAVEINCAPS))

	    == MMSYSERR_NOERROR) {

	    QString tmp;

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

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

	        devId = ii;

		break;

	    }

	}

    }

    if(waveInOpen(&hWaveIn, devId, &wfx,

                (DWORD_PTR)&waveInProc,

                (DWORD_PTR) this,

                CALLBACK_FUNCTION) != MMSYSERR_NOERROR) {

        errorState = QAudio::OpenError;

        deviceState = QAudio::StoppedState;

        emit stateChanged(deviceState);

        qWarning("QAudioInput: failed to open audio device");

        return false;

    }

    waveBlocks = allocateBlocks(period_size, buffer_size/period_size);

    if(waveBlocks == 0) {

        errorState = QAudio::OpenError;

        deviceState = QAudio::StoppedState;

        emit stateChanged(deviceState);

        qWarning("QAudioInput: failed to allocate blocks. open failed");

        return false;

    }

    EnterCriticalSection(&waveInCriticalSection);

    waveFreeBlockCount = buffer_size/period_size;

    LeaveCriticalSection(&waveInCriticalSection);

    waveCurrentBlock = 0;

    for(int i=0; i<buffer_size/period_size; i++) {

        result = waveInAddBuffer(hWaveIn, &waveBlocks[i], sizeof(WAVEHDR));

        if(result != MMSYSERR_NOERROR) {

            qWarning("QAudioInput: failed to setup block %d,err=%d",i,result);

            errorState = QAudio::OpenError;

            deviceState = QAudio::StoppedState;

            emit stateChanged(deviceState);

            return false;

        }

    }

    result = waveInStart(hWaveIn);

    if(result) {

        qWarning("QAudioInput: failed to start audio input");

        errorState = QAudio::OpenError;

        deviceState = QAudio::StoppedState;

        emit stateChanged(deviceState);

        return false;

    }

    timeStampOpened.restart();

    elapsedTimeOffset = 0;

    totalTimeValue = 0;

    errorState  = QAudio::NoError;

    return true;

}

void QAudioInputPrivate::close()

{

    if(deviceState == QAudio::StoppedState)

        return;

    deviceState = QAudio::StoppedState;

    waveInReset(hWaveIn);

    waveInClose(hWaveIn);

    int count = 0;

    while(!finished && count < 500) {

        count++;

        Sleep(10);

    }

    EnterCriticalSection(&waveInCriticalSection);

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

        if(waveBlocks[i].dwFlags & WHDR_PREPARED)

            waveInUnprepareHeader(hWaveIn,&waveBlocks[i],sizeof(WAVEHDR));

    }

    LeaveCriticalSection(&waveInCriticalSection);

    freeBlocks(waveBlocks);

}

int QAudioInputPrivate::bytesReady() const

{

    if(period_size == 0 || buffer_size == 0)

        return 0;

    int buf = ((buffer_size/period_size)-waveFreeBlockCount)*period_size;

    if(buf < 0)

        buf = 0;

    return buf;

}

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

{

    bool done = false;

    char*  p = data;

    qint64 l = 0;

    qint64 written = 0;

    while(!done) {

        // Read in some audio data

        if(waveBlocks[header].dwBytesRecorded > 0 && waveBlocks[header].dwFlags & WHDR_DONE) {

            if(pullMode) {

                l = audioSource->write(waveBlocks[header].lpData,

                        waveBlocks[header].dwBytesRecorded);

#ifdef DEBUG_AUDIO

                qDebug()<<"IN: "<<waveBlocks[header].dwBytesRecorded<<", OUT: "<<l;

#endif

                if(l < 0) {

                    // error

                    qWarning("QAudioInput: IOError");

                    errorState = QAudio::IOError;

                } else if(l == 0) {

                    // cant write to IODevice

                    qWarning("QAudioInput: IOError, can't write to QIODevice");

                    errorState = QAudio::IOError;

                } else {

                    totalTimeValue += waveBlocks[header].dwBytesRecorded;

                    errorState = QAudio::NoError;

                    if (deviceState != QAudio::ActiveState) {

                        deviceState = QAudio::ActiveState;

                        emit stateChanged(deviceState);

                    }

		    resuming = false;

                }

            } else {

                // push mode

                memcpy(p,waveBlocks[header].lpData,waveBlocks[header].dwBytesRecorded);

                l = waveBlocks[header].dwBytesRecorded;

#ifdef DEBUG_AUDIO

                qDebug()<<"IN: "<<waveBlocks[header].dwBytesRecorded<<", OUT: "<<l;

#endif

                totalTimeValue += waveBlocks[header].dwBytesRecorded;

                errorState = QAudio::NoError;

                if (deviceState != QAudio::ActiveState) {

                    deviceState = QAudio::ActiveState;

                    emit stateChanged(deviceState);

                }

		resuming = false;

            }

        } else {

            //no data, not ready yet, next time

            break;

        }

        waveInUnprepareHeader(hWaveIn,&waveBlocks[header], sizeof(WAVEHDR));

        EnterCriticalSection(&waveInCriticalSection);

        waveFreeBlockCount++;

        LeaveCriticalSection(&waveInCriticalSection);

        waveBlocks[header].dwBytesRecorded=0;

        waveBlocks[header].dwFlags = 0L;

        result = waveInPrepareHeader(hWaveIn,&waveBlocks[header], sizeof(WAVEHDR));

        if(result != MMSYSERR_NOERROR) {

            result = waveInPrepareHeader(hWaveIn,&waveBlocks[header], sizeof(WAVEHDR));

            qWarning("QAudioInput: failed to prepare block %d,err=%d",header,result);

            errorState = QAudio::IOError;

            EnterCriticalSection(&waveInCriticalSection);

            waveFreeBlockCount--;

            LeaveCriticalSection(&waveInCriticalSection);

            return 0;

        }

        result = waveInAddBuffer(hWaveIn, &waveBlocks[header], sizeof(WAVEHDR));

        if(result != MMSYSERR_NOERROR) {

            qWarning("QAudioInput: failed to setup block %d,err=%d",header,result);

            errorState = QAudio::IOError;

            EnterCriticalSection(&waveInCriticalSection);

            waveFreeBlockCount--;

            LeaveCriticalSection(&waveInCriticalSection);

            return 0;

        }

        header++;

        if(header >= buffer_size/period_size)

            header = 0;

        p+=l;

        EnterCriticalSection(&waveInCriticalSection);

        if(!pullMode) {

	    if(l+period_size > len && waveFreeBlockCount == buffer_size/period_size)

	        done = true;

	} else {

	    if(waveFreeBlockCount == buffer_size/period_size)

	        done = true;

	}

        LeaveCriticalSection(&waveInCriticalSection);

	written+=l;

    }

#ifdef DEBUG_AUDIO

    qDebug()<<"read in len="<<written;

#endif

    return written;

}

void QAudioInputPrivate::resume()

{

    if(deviceState == QAudio::SuspendedState) {

        deviceState = QAudio::ActiveState;

        for(int i=0; i<buffer_size/period_size; i++) {

            result = waveInAddBuffer(hWaveIn, &waveBlocks[i], sizeof(WAVEHDR));

            if(result != MMSYSERR_NOERROR) {

                qWarning("QAudioInput: failed to setup block %d,err=%d",i,result);

                errorState = QAudio::OpenError;

                deviceState = QAudio::StoppedState;

                emit stateChanged(deviceState);

                return;

            }

        }

        EnterCriticalSection(&waveInCriticalSection);

        waveFreeBlockCount = buffer_size/period_size;

        LeaveCriticalSection(&waveInCriticalSection);

        waveCurrentBlock = 0;

        header = 0;

	resuming = true;

        waveInStart(hWaveIn);

        QTimer::singleShot(20,this,SLOT(feedback()));

        emit stateChanged(deviceState);

    }

}

void QAudioInputPrivate::setBufferSize(int value)

{

    buffer_size = value;

}

int QAudioInputPrivate::bufferSize() const

{

    return buffer_size;

}

int QAudioInputPrivate::periodSize() const

{

    return period_size;

}

void QAudioInputPrivate::setNotifyInterval(int ms)

{

    if(ms >= minimumIntervalTime)

        intervalTime = ms;

    else

        intervalTime = minimumIntervalTime;

}

int QAudioInputPrivate::notifyInterval() const

{

    return intervalTime;

}

qint64 QAudioInputPrivate::processedUSecs() const

{

    if (deviceState == QAudio::StoppedState)

        return 0;

    qint64 result = qint64(1000000) * totalTimeValue /

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

        settings.frequency();

    return result;

}

void QAudioInputPrivate::suspend()

{

    if(deviceState == QAudio::ActiveState) {