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iodevicereader.cpp

/*  This file is part of the KDE project.

Copyright (C) 2007 Trolltech ASA. All rights reserved.

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 "iodevicereader.h"
#include "qasyncreader.h"

#include "mediagraph.h"

#include <phonon/streaminterface.h>

#include <initguid.h>

QT_BEGIN_NAMESPACE


namespace Phonon
{
    namespace DS9
    {

        // {A222A867-A6FF-4f90-B514-0719A44D9F66}
        DEFINE_GUID(CLSID_IODeviceReader,
            0xa222a867, 0xa6ff, 0x4f90, 0xb5, 0x14, 0x7, 0x19, 0xa4, 0x4d, 0x9f, 0x66);

        //these mediatypes define a stream, its type will be autodetected by DirectShow
        static QVector<AM_MEDIA_TYPE> getMediaTypes()
        {
            AM_MEDIA_TYPE mt;
            mt.majortype = MEDIATYPE_Stream;
            mt.bFixedSizeSamples = TRUE;
            mt.bTemporalCompression = FALSE;
            mt.lSampleSize = 1;
            mt.formattype = GUID_NULL;
            mt.pUnk = 0;
            mt.cbFormat = 0;
            mt.pbFormat = 0;

            QVector<AM_MEDIA_TYPE> ret;
            //normal auto-detect stream
            mt.subtype = MEDIASUBTYPE_NULL;
            ret << mt;
            //AVI stream
            mt.subtype = MEDIASUBTYPE_Avi;
            ret << mt;
            //WAVE stream
            mt.subtype = MEDIASUBTYPE_WAVE;
            ret << mt;
            return ret;
        }

        class StreamReader : public QAsyncReader, public Phonon::StreamInterface
        {
        public:
            StreamReader(QBaseFilter *parent, const Phonon::MediaSource &source, const MediaGraph *mg) : 
              QAsyncReader(parent, getMediaTypes()),
                  m_seekable(false), m_pos(0), m_size(-1), m_mediaGraph(mg)
              {
                  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();
              }

              //virtual pure members

              //implementation from IAsyncReader
              STDMETHODIMP Length(LONGLONG *total, LONGLONG *available)
              {
                  QReadLocker locker(&m_lock);
                  if (total) {
                      *total = m_size;
                  }

                  if (available) {
                      *available = m_size;
                  }

                  return S_OK;
              }


              HRESULT read(LONGLONG pos, LONG length, BYTE *buffer, LONG *actual)
              {
                  QMutexLocker locker(&m_mutexRead);

                  if (m_mediaGraph->isStopping()) {
                      return VFW_E_WRONG_STATE;
                  }

                  if(streamSize() != 1 && pos + length > streamSize()) {
                      //it tries to read outside of the boundaries
                      return E_FAIL;
                  }

                  if (currentPos() - currentBufferSize() != pos) {
                      if (!streamSeekable()) {
                          return S_FALSE;
                      }
                      setCurrentPos(pos);
                  }

                  int oldSize = currentBufferSize();
                  while (currentBufferSize() < int(length)) {
                      needData();
                      if (m_mediaGraph->isStopping()) {
                          return VFW_E_WRONG_STATE;
                      }

                      if (oldSize == currentBufferSize()) {
                          break; //we didn't get any data
                      }
                      oldSize = currentBufferSize();
                  }

                  DWORD bytesRead = qMin(currentBufferSize(), int(length));
                  {
                      QWriteLocker locker(&m_lock);
                      qMemCopy(buffer, m_buffer.data(), bytesRead);
                      //truncate the buffer
                      m_buffer = m_buffer.mid(bytesRead);
                  }

                  if (actual) {
                      *actual = bytesRead; //initialization
                  }

                  return bytesRead == length ? S_OK : S_FALSE;
              }

        public:
            //for Phonon::StreamInterface
            QByteArray m_buffer;
            bool m_seekable;
            qint64 m_pos;
            qint64 m_size;

            QMutex m_mutexRead;
            const MediaGraph *m_mediaGraph;
        };

        IODeviceReader::IODeviceReader(const Phonon::MediaSource &source, const MediaGraph *mg) :
        QBaseFilter(CLSID_IODeviceReader)
        {
            //create the output pin
            m_streamReader = new StreamReader(this, source, mg);
        }

        IODeviceReader::~IODeviceReader()
        {
        }

        STDMETHODIMP IODeviceReader::Stop()
        {
            HRESULT hr = QBaseFilter::Stop();
            m_streamReader->enoughData(); //this asks to cancel any blocked call to needData
            return hr;
        }

    }
}

QT_END_NAMESPACE

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