/*  This file is part of the KDE project.

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

This library is free software: you can redistribute it and/or modify

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation, either version 2.1 or 3 of the License.

This library 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License

along with this library.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "mediaobject.h"

#include "audiooutput.h"

#include <QtCore/QVector>

#include <QtCore/QTimerEvent>

#include <QtCore/QTimer>

#include <QtCore/QTime>

#include <QtCore/QLibrary>

#include <QtCore/QUrl>

#include <QtCore/QWriteLocker>

#include <phonon/streaminterface.h>

#define WAVEHEADER_OFFSET_FORMATTAG        20

#define WAVEHEADER_OFFSET_CHANNELS         22

#define WAVEHEADER_OFFSET_SAMPLESPERSEC    24

#define WAVEHEADER_OFFSET_AVGBYTESPERSEC   28

#define WAVEHEADER_OFFSET_BLOCKALIGN       32

#define WAVEHEADER_OFFSET_BITSPERSAMPLE    34

#define WAVEHEADER_OFFSET_DATA             44

#define WAVEHEADER_SIZE                    WAVEHEADER_OFFSET_DATA

QT_BEGIN_NAMESPACE

namespace Phonon

{

    namespace WaveOut

    {        

        static unsigned int buffer_size = (16 * 1024 * 4);

        QString getErrorText(MMRESULT error)

        {

            ushort b[256];

            waveOutGetErrorText(error, (LPWSTR)b, 256);

            return QString::fromUtf16(b);

        }

        class WorkerThread : public QThread

        {

         Q_OBJECT

         public slots:

              void stream(QIODevice *file, QByteArray *buffer, bool *finished);

        };

        void WorkerThread::stream(QIODevice *ioStream, QByteArray *buffer, bool *finished)

        {

            (*finished) = false;

            memset((void*) buffer->data(), 0, buffer->size());

            qint64 i = ioStream->read(buffer->data(), buffer_size);

            buffer->resize(i);

            (*finished) = true;

        }

        void CALLBACK MediaObject::WaveOutCallBack(HWAVEOUT m_hWaveOut, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2)

        {

            Q_UNUSED(m_hWaveOut);

            Q_UNUSED(dwInstance);

            Q_UNUSED(dwParam2);

            switch(uMsg)

            {

            case WOM_OPEN:

                break;

            case WOM_DONE:

                {

                    WAVEHDR *waveHeader = (WAVEHDR*)dwParam1;

                    MediaObject* mediaObject = reinterpret_cast<MediaObject *>(waveHeader->dwUser);

                    if (mediaObject) {

                        mediaObject->swapBuffers();

                    }

                }

                break;

            case WOM_CLOSE:

                break;

            }

        }

        class StreamReader : public Phonon::StreamInterface

        {

        public:

              StreamReader(QObject *parent, const Phonon::MediaSource &source) :

                  m_seekable(false), m_pos(0), m_size(-1)

              {

                  Q_UNUSED(parent);

                  connectToSource(source);

              }

              //for Phonon::StreamInterface

              void writeData(const QByteArray &data)

              {

                  QWriteLocker locker(&m_lock);

                  m_pos += data.size();

                  m_buffer += data;

              }

              void endOfData()

              {

              }

              void setStreamSize(qint64 newSize)

              {

                  QWriteLocker locker(&m_lock);

                  m_size = newSize;

              }

              qint64 streamSize() const

              {

                  QReadLocker locker(&m_lock);

                  return m_size;

              }

              void setStreamSeekable(bool s)

              {

                  QWriteLocker locker(&m_lock);

                  m_seekable = s;

              }

              bool streamSeekable() const

              {

                  QReadLocker locker(&m_lock);

                  return m_seekable;

              }

              void setCurrentPos(qint64 pos)

              {

                  QWriteLocker locker(&m_lock);

                  m_pos = pos;

                  seekStream(pos);

                  m_buffer.clear();

              }

              qint64 currentPos() const

              {

                  QReadLocker locker(&m_lock);

                  return m_pos;

              }

              int currentBufferSize() const

              {

                  QReadLocker locker(&m_lock);

                  return m_buffer.size();

              }

            //for Phonon::StreamInterface

            QByteArray m_buffer;

            bool m_seekable;

            qint64 m_pos;

            qint64 m_size;

            mutable QReadWriteLock m_lock;

        };

        class IOWrapper : public QIODevice {

        public:

            IOWrapper(QObject *parent, const Phonon::MediaSource &source) : m_streamReader(this, source)

            {

                Q_UNUSED(parent);

                setOpenMode(QIODevice::ReadOnly);

            }

            bool seek(qint64 pos);

            qint64 size() const;

            qint64 pos();

            bool isReadable() const;

         protected:

            qint64 readData (char * data, qint64 maxSize);

            qint64 writeData(const char *,qint64);

        private:

            StreamReader m_streamReader;

        };

        bool IOWrapper::isReadable () const

        {

            return true;

        }

        qint64 IOWrapper::pos()

        {

            return (m_streamReader.streamSeekable() ? m_streamReader.currentPos() : 0);

        }

        bool IOWrapper::seek( qint64 pos)

        {

            if (!m_streamReader.streamSeekable())

                return false;

            m_streamReader.setCurrentPos(pos);

            return true;

        }

        qint64 IOWrapper::size() const

        {

            return m_streamReader.streamSize();

        }

        qint64 IOWrapper::readData(char * data, qint64 maxSize)

        {

            int oldSize = m_streamReader.currentBufferSize();

            while (m_streamReader.currentBufferSize() < maxSize) {

                m_streamReader.needData();

                if (oldSize == m_streamReader.currentBufferSize()) {

                    break; //we didn't get any data

                }

                oldSize = m_streamReader.currentBufferSize();

            }

            qint64 bytesRead = qMin(qint64(m_streamReader.currentBufferSize()), maxSize);

            {

                QWriteLocker locker(&m_streamReader.m_lock);

                qMemCopy(data, m_streamReader.m_buffer.data(), bytesRead);

                //truncate the buffer

                m_streamReader.m_buffer = m_streamReader.m_buffer.mid(bytesRead);

            }

            return bytesRead;

        }

        qint64 IOWrapper::writeData(const char *,qint64)

        {

            return 0;

        }

        MediaObject::MediaObject(QObject *parent) : m_file(0), m_stream(0),

                                                    m_hWaveOut(0), m_nextBufferIndex(1), 

                                                    m_mediaSize(-1), m_bufferingFinished(0),

                                                    m_paused(0), m_tickInterval(0),

                                                    m_hasNextSource(0), m_hasSource(0),

                                                    m_sourceIsValid(0), m_errorType(Phonon::NoError),

                                                    m_currentTime(0), m_transitionTime(0),

                                                    m_tick(0), m_volume(100), m_prefinishMark(0),

                                                    m_tickIntervalResolution(0), m_bufferPrepared(0),

                                                    m_stopped(0)

        {

            m_thread = new WorkerThread();

            m_thread->start();

            m_soundBuffer1.waveHeader = new WAVEHDR;

            m_soundBuffer2.waveHeader = new WAVEHDR;

            setParent(parent);

            setState(Phonon::LoadingState);            

        }

        MediaObject::~MediaObject()

        {

            stop();

            do { //The event loop of m_thread might not be started, yet

                m_thread->quit(); //If the event loop is not started yet quit() does nothing

                m_thread->wait(100);

            } while (m_thread->isRunning());

            delete m_thread;

            deleteValidWaveOutDevice();

            delete m_soundBuffer1.waveHeader;

            delete m_soundBuffer2.waveHeader;

        }

        Phonon::State MediaObject::state() const

        {

           return m_state;

        }

        bool MediaObject::hasVideo() const

        {

            return false;

        }

        bool MediaObject::isSeekable() const

        {

            if (!m_stream) 

              return false; 

            return !m_stream->isSequential();

        }

        qint64 MediaObject::totalTime() const

        {

            return m_totalTime;

        }

        qint64 MediaObject::currentTime() const

        {

            //this handles inaccuracy when stopping on a title

            return m_currentTime;

        }

        qint32 MediaObject::tickInterval() const

        {

            return m_tickInterval * m_tickIntervalResolution;

        }

        void MediaObject::setTickInterval(qint32 newTickInterval)

        {

            if ((m_tickIntervalResolution == 0) || (newTickInterval == 0))

                return;

            m_tickInterval = newTickInterval / m_tickIntervalResolution;

            if ((newTickInterval > 0) && (m_tickInterval == 0))

                m_tickInterval = 1;

        }

        void MediaObject::pause()

        {

            if (!m_paused) {

                m_paused = true;

                setState(Phonon::PausedState);

                if (!(waveOutPause(m_hWaveOut) == MMSYSERR_NOERROR))

                {

                    setError(Phonon::NormalError, QLatin1String("cannot pause (system error)"));

                }

            }

        }

        void MediaObject::stop()

        {

            setState(Phonon::StoppedState);

            m_stopped = true;

            m_paused = false;

            seek(0);

            if (!(waveOutReset(m_hWaveOut) == MMSYSERR_NOERROR))

                setError(Phonon::NormalError, QLatin1String("cannot stop (system error)"));

        }

        void MediaObject::play()

        {

            if ((m_state == Phonon::PlayingState) && !m_paused && !m_stopped)

                return;

            if  ((m_state == Phonon::LoadingState) ||

                 (m_state == Phonon::BufferingState) ||

                 (m_state == Phonon::ErrorState)) {

                    setError(Phonon::FatalError, QLatin1String("illegale state for playback"));

                    return;

            }

            if (m_state == Phonon::StoppedState)

                stop();

            if (m_sourceIsValid) {

                setState(Phonon::PlayingState);

                if (!m_paused) {

                    m_nextBufferIndex = true;

                    m_stopped = false;

                    playBuffer(m_soundBuffer1.waveHeader);

                    playBuffer(m_soundBuffer2.waveHeader);

                } else {

                    if (!(waveOutRestart(m_hWaveOut) == MMSYSERR_NOERROR))

                        setError(Phonon::NormalError, QLatin1String("cannot resume (system)"));

                }

            } else {

                setError(Phonon::FatalError, QLatin1String("cannot playback invalid source"));

            }

            m_paused = false;

        }

        QString MediaObject::errorString() const

        {

            return m_errorString;

        }

        Phonon::ErrorType MediaObject::errorType() const

        {

            return Phonon::ErrorType();

        }

        qint32 MediaObject::prefinishMark() const

        {

            return m_prefinishMark;

        }

        void MediaObject::setPrefinishMark(qint32 newPrefinishMark)

        {

            m_prefinishMark = newPrefinishMark;

        }

        qint32 MediaObject::transitionTime() const

        {

            return m_transitionTime;

        }

        void MediaObject::setTransitionTime(qint32 time)

        {

           m_transitionTime = time;

        }

        qint64 MediaObject::remainingTime() const

        {

            return m_totalTime - m_currentTime;

        }

        Phonon::MediaSource MediaObject::source() const

        {

            return Phonon::MediaSource();

        }

        void MediaObject::setNextSource(const Phonon::MediaSource &source)

        {

            m_nextSource = source;

            m_hasNextSource = true;

        }

        void MediaObject::setSource(const Phonon::MediaSource &source)

        {

            if (m_state == Phonon::PlayingState)

            {

                setError(Phonon::NormalError, QLatin1String("source changed while playing"));

                stop();

            }

            m_source = source;

            m_hasSource = true;

            m_sourceIsValid = false;

            emit currentSourceChanged(source);

            if (source.type() == Phonon::MediaSource::LocalFile) {

                if (!openWaveFile(source.fileName())) {

                  setError(Phonon::FatalError, QLatin1String("cannot open media file"));

                  return ;

                }

            } else if (source.type() == Phonon::MediaSource::Stream) {

                if (m_stream)

                   delete m_stream;

                m_stream = new IOWrapper(this, source);

                m_mediaSize = m_stream->size();

            } else if (source.type() == Phonon::MediaSource::Url) {

                if (!openWaveFile(source.url().toLocalFile())) {

                    setError(Phonon::FatalError, QLatin1String("cannot open media file"));

                    return ;

                }

            } else {

                setError(Phonon::FatalError, QLatin1String("type of source not supported"));

                return ;

            }

            setState(Phonon::LoadingState);

            if (!readHeader())

                setError(Phonon::FatalError, QLatin1String("invalid header"));

            else if (!getWaveOutDevice())

                setError(Phonon::FatalError, QLatin1String("No waveOut device available"));

            else if (!fillBuffers())

                setError(Phonon::FatalError, QLatin1String("no data for buffering"));

            else if (!prepareBuffers())

                setError(Phonon::FatalError, QLatin1String("cannot prepare buffers"));

            else

                m_sourceIsValid = true;

            if (m_sourceIsValid)

                setState(Phonon::StoppedState);

        }

        void MediaObject::seek(qint64 time)

        {

            if (!m_sourceIsValid) {

                setError(Phonon::NormalError, QLatin1String("source is not valid"));

                return;

            }

            if ((time >= 0) && (time < m_totalTime)) {

                int counter = 0;

                while (!m_bufferingFinished && (counter < 200)) {

                  Sleep(20);

                  counter ++;

                }

                if (counter >= 200) {

                   setError(Phonon::NormalError, QLatin1String("buffering timed out"));

                   return;

                }

                m_stream->seek(WAVEHEADER_SIZE + time * m_waveFormatEx.nSamplesPerSec * m_waveFormatEx.wBitsPerSample * m_waveFormatEx.nChannels / 8 / 1000);

                m_currentTime = time;

                if (m_state == Phonon::PlayingState)

                  play();

            } else {

                setError(Phonon::NormalError, QLatin1String("seeking out of range"));

            }

        }

        void MediaObject::unPrepareBuffers()

        {

            if (m_bufferPrepared) {

            DWORD err1 = waveOutUnprepareHeader(m_hWaveOut, m_soundBuffer1.waveHeader, sizeof(WAVEHDR));

            DWORD err2 = waveOutUnprepareHeader(m_hWaveOut, m_soundBuffer2.waveHeader, sizeof(WAVEHDR));

            if (!(err1 == MMSYSERR_NOERROR) || !(err2 == MMSYSERR_NOERROR))

                setError(Phonon::NormalError, QLatin1String("cannot unprepare buffer") + getErrorText(err1) + getErrorText(err2));

            }

            m_bufferPrepared = false;

        }

        bool MediaObject::prepareBuffers()

        {

            memset((void*)m_soundBuffer1.waveHeader, 0, sizeof(WAVEHDR));

            m_soundBuffer1.waveHeader->lpData = m_soundBuffer1.data.data();

            m_soundBuffer1.waveHeader->dwBufferLength = m_soundBuffer1.data.size();

            m_soundBuffer1.waveHeader->dwUser = (DWORD_PTR) this;

            ZeroMemory((void*)m_soundBuffer2.waveHeader, sizeof(WAVEHDR));

            m_soundBuffer2.waveHeader->lpData = m_soundBuffer2.data.data();

            m_soundBuffer2.waveHeader->dwBufferLength = m_soundBuffer1.data.size();

            m_soundBuffer2.waveHeader->dwUser = (DWORD_PTR) this;

            m_bufferPrepared = (waveOutPrepareHeader(m_hWaveOut, m_soundBuffer1.waveHeader, sizeof(WAVEHDR)) == MMSYSERR_NOERROR)

                && (waveOutPrepareHeader(m_hWaveOut, m_soundBuffer2.waveHeader, sizeof(WAVEHDR)) == MMSYSERR_NOERROR);

             return m_bufferPrepared;

        }

        void MediaObject::deleteValidWaveOutDevice()

        {

            if (m_hWaveOut) {

                unPrepareBuffers();

                if (!(waveOutClose(m_hWaveOut)  == MMSYSERR_NOERROR))

                    setError(Phonon::NormalError, QLatin1String("cannot close wave device"));

            }

        }

        bool MediaObject::getWaveOutDevice()

        {

            deleteValidWaveOutDevice();