| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** |
| ** This file is part of the Qt Mobility Components. |
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| ** $QT_BEGIN_LICENSE:LGPL$ |
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| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
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| ** $QT_END_LICENSE$ |
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| ****************************************************************************/ |
| |
| #include "mfstream.h" |
| #include <QtCore/qcoreapplication.h> |
| |
| //MFStream is added for supporting QIODevice type of media source. |
| //It is used to delegate invocations from media foundation(through IMFByteStream) to QIODevice. |
| |
| MFStream::MFStream(QIODevice *stream, bool ownStream) |
| : m_cRef(1) |
| , m_stream(stream) |
| , m_ownStream(ownStream) |
| , m_currentReadResult(0) |
| { |
| //Move to the thread of the stream object |
| //to make sure invocations on stream |
| //are happened in the same thread of stream object |
| this->moveToThread(stream->thread()); |
| connect(stream, SIGNAL(readyRead()), this, SLOT(handleReadyRead())); |
| } |
| |
| MFStream::~MFStream() |
| { |
| if (m_currentReadResult) |
| m_currentReadResult->Release(); |
| if (m_ownStream) |
| m_stream->deleteLater(); |
| } |
| |
| //from IUnknown |
| STDMETHODIMP MFStream::QueryInterface(REFIID riid, LPVOID *ppvObject) |
| { |
| if (!ppvObject) |
| return E_POINTER; |
| if (riid == IID_IMFByteStream) { |
| *ppvObject = static_cast<IMFByteStream*>(this); |
| } else if (riid == IID_IUnknown) { |
| *ppvObject = static_cast<IUnknown*>(this); |
| } else { |
| *ppvObject = NULL; |
| return E_NOINTERFACE; |
| } |
| AddRef(); |
| return S_OK; |
| } |
| |
| STDMETHODIMP_(ULONG) MFStream::AddRef(void) |
| { |
| return InterlockedIncrement(&m_cRef); |
| } |
| |
| STDMETHODIMP_(ULONG) MFStream::Release(void) |
| { |
| LONG cRef = InterlockedDecrement(&m_cRef); |
| if (cRef == 0) { |
| this->deleteLater(); |
| } |
| return cRef; |
| } |
| |
| |
| //from IMFByteStream |
| STDMETHODIMP MFStream::GetCapabilities(DWORD *pdwCapabilities) |
| { |
| if (!pdwCapabilities) |
| return E_INVALIDARG; |
| *pdwCapabilities = MFBYTESTREAM_IS_READABLE; |
| if (!m_stream->isSequential()) |
| *pdwCapabilities |= MFBYTESTREAM_IS_SEEKABLE; |
| return S_OK; |
| } |
| |
| STDMETHODIMP MFStream::GetLength(QWORD *pqwLength) |
| { |
| if (!pqwLength) |
| return E_INVALIDARG; |
| QMutexLocker locker(&m_mutex); |
| *pqwLength = QWORD(m_stream->size()); |
| return S_OK; |
| } |
| |
| STDMETHODIMP MFStream::SetLength(QWORD) |
| { |
| return E_NOTIMPL; |
| } |
| |
| STDMETHODIMP MFStream::GetCurrentPosition(QWORD *pqwPosition) |
| { |
| if (!pqwPosition) |
| return E_INVALIDARG; |
| QMutexLocker locker(&m_mutex); |
| *pqwPosition = m_stream->pos(); |
| return S_OK; |
| } |
| |
| STDMETHODIMP MFStream::SetCurrentPosition(QWORD qwPosition) |
| { |
| QMutexLocker locker(&m_mutex); |
| //SetCurrentPosition may happend during the BeginRead/EndRead pair, |
| //refusing to execute SetCurrentPosition during that time seems to be |
| //the simplest workable solution |
| if (m_currentReadResult) |
| return S_FALSE; |
| |
| bool seekOK = m_stream->seek(qint64(qwPosition)); |
| if (seekOK) |
| return S_OK; |
| else |
| return S_FALSE; |
| } |
| |
| STDMETHODIMP MFStream::IsEndOfStream(BOOL *pfEndOfStream) |
| { |
| if (!pfEndOfStream) |
| return E_INVALIDARG; |
| QMutexLocker locker(&m_mutex); |
| *pfEndOfStream = m_stream->atEnd() ? TRUE : FALSE; |
| return S_OK; |
| } |
| |
| STDMETHODIMP MFStream::Read(BYTE *pb, ULONG cb, ULONG *pcbRead) |
| { |
| QMutexLocker locker(&m_mutex); |
| qint64 read = m_stream->read((char*)(pb), qint64(cb)); |
| if (pcbRead) |
| *pcbRead = ULONG(read); |
| return S_OK; |
| } |
| |
| STDMETHODIMP MFStream::BeginRead(BYTE *pb, ULONG cb, IMFAsyncCallback *pCallback, |
| IUnknown *punkState) |
| { |
| if (!pCallback || !pb) |
| return E_INVALIDARG; |
| |
| Q_ASSERT(m_currentReadResult == NULL); |
| |
| AsyncReadState *state = new (std::nothrow) AsyncReadState(pb, cb); |
| if (state == NULL) |
| return E_OUTOFMEMORY; |
| |
| HRESULT hr = MFCreateAsyncResult(state, pCallback, punkState, &m_currentReadResult); |
| state->Release(); |
| if (FAILED(hr)) |
| return hr; |
| |
| QCoreApplication::postEvent(this, new QEvent(QEvent::User)); |
| return hr; |
| } |
| |
| STDMETHODIMP MFStream::EndRead(IMFAsyncResult* pResult, ULONG *pcbRead) |
| { |
| if (!pcbRead) |
| return E_INVALIDARG; |
| IUnknown *pUnk; |
| pResult->GetObject(&pUnk); |
| AsyncReadState *state = static_cast<AsyncReadState*>(pUnk); |
| *pcbRead = state->bytesRead(); |
| pUnk->Release(); |
| |
| m_currentReadResult->Release(); |
| m_currentReadResult = NULL; |
| |
| return S_OK; |
| } |
| |
| STDMETHODIMP MFStream::Write(const BYTE *, ULONG, ULONG *) |
| { |
| return E_NOTIMPL; |
| } |
| |
| STDMETHODIMP MFStream::BeginWrite(const BYTE *, ULONG , |
| IMFAsyncCallback *, |
| IUnknown *) |
| { |
| return E_NOTIMPL; |
| } |
| |
| STDMETHODIMP MFStream::EndWrite(IMFAsyncResult *, |
| ULONG *) |
| { |
| return E_NOTIMPL; |
| } |
| |
| STDMETHODIMP MFStream::Seek( |
| MFBYTESTREAM_SEEK_ORIGIN SeekOrigin, |
| LONGLONG llSeekOffset, |
| DWORD, |
| QWORD *pqwCurrentPosition) |
| { |
| QMutexLocker locker(&m_mutex); |
| if (m_currentReadResult) |
| return S_FALSE; |
| |
| qint64 pos = qint64(llSeekOffset); |
| switch (SeekOrigin) { |
| case msoBegin: |
| break; |
| case msoCurrent: |
| pos += m_stream->pos(); |
| break; |
| } |
| bool seekOK = m_stream->seek(pos); |
| if (pqwCurrentPosition) |
| *pqwCurrentPosition = pos; |
| if (seekOK) |
| return S_OK; |
| else |
| return S_FALSE; |
| } |
| |
| STDMETHODIMP MFStream::Flush() |
| { |
| return E_NOTIMPL; |
| } |
| |
| STDMETHODIMP MFStream::Close() |
| { |
| QMutexLocker locker(&m_mutex); |
| if (m_ownStream) |
| m_stream->close(); |
| return S_OK; |
| } |
| |
| void MFStream::doRead() |
| { |
| bool readDone = true; |
| IUnknown *pUnk = NULL; |
| HRESULT hr = m_currentReadResult->GetObject(&pUnk); |
| if (SUCCEEDED(hr)) { |
| //do actual read |
| AsyncReadState *state = static_cast<AsyncReadState*>(pUnk); |
| ULONG cbRead; |
| Read(state->pb(), state->cb() - state->bytesRead(), &cbRead); |
| pUnk->Release(); |
| |
| state->setBytesRead(cbRead + state->bytesRead()); |
| if (state->cb() > state->bytesRead() && !m_stream->atEnd()) { |
| readDone = false; |
| } |
| } |
| |
| if (readDone) { |
| //now inform the original caller |
| m_currentReadResult->SetStatus(hr); |
| MFInvokeCallback(m_currentReadResult); |
| } |
| } |
| |
| |
| void MFStream::handleReadyRead() |
| { |
| doRead(); |
| } |
| |
| void MFStream::customEvent(QEvent *event) |
| { |
| if (event->type() != QEvent::User) { |
| QObject::customEvent(event); |
| return; |
| } |
| doRead(); |
| } |
| |
| //AsyncReadState is a helper class used in BeginRead for asynchronous operation |
| //to record some BeginRead parameters, so these parameters could be |
| //used later when actually executing the read operation in another thread. |
| MFStream::AsyncReadState::AsyncReadState(BYTE *pb, ULONG cb) |
| : m_cRef(1) |
| , m_pb(pb) |
| , m_cb(cb) |
| , m_cbRead(0) |
| { |
| } |
| |
| //from IUnknown |
| STDMETHODIMP MFStream::AsyncReadState::QueryInterface(REFIID riid, LPVOID *ppvObject) |
| { |
| if (!ppvObject) |
| return E_POINTER; |
| |
| if (riid == IID_IUnknown) { |
| *ppvObject = static_cast<IUnknown*>(this); |
| } else { |
| *ppvObject = NULL; |
| return E_NOINTERFACE; |
| } |
| AddRef(); |
| return S_OK; |
| } |
| |
| STDMETHODIMP_(ULONG) MFStream::AsyncReadState::AddRef(void) |
| { |
| return InterlockedIncrement(&m_cRef); |
| } |
| |
| STDMETHODIMP_(ULONG) MFStream::AsyncReadState::Release(void) |
| { |
| LONG cRef = InterlockedDecrement(&m_cRef); |
| if (cRef == 0) |
| delete this; |
| // For thread safety, return a temporary variable. |
| return cRef; |
| } |
| |
| BYTE* MFStream::AsyncReadState::pb() const |
| { |
| return m_pb; |
| } |
| |
| ULONG MFStream::AsyncReadState::cb() const |
| { |
| return m_cb; |
| } |
| |
| ULONG MFStream::AsyncReadState::bytesRead() const |
| { |
| return m_cbRead; |
| } |
| |
| void MFStream::AsyncReadState::setBytesRead(ULONG cbRead) |
| { |
| m_cbRead = cbRead; |
| } |