diff options
Diffstat (limited to 'src/plugins/directshow/common/directshowsamplegrabber.cpp')
-rw-r--r-- | src/plugins/directshow/common/directshowsamplegrabber.cpp | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src/plugins/directshow/common/directshowsamplegrabber.cpp b/src/plugins/directshow/common/directshowsamplegrabber.cpp new file mode 100644 index 000000000..b33c3cfc6 --- /dev/null +++ b/src/plugins/directshow/common/directshowsamplegrabber.cpp @@ -0,0 +1,196 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** 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 +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "directshowsamplegrabber.h" + +#include "directshowglobal.h" +#include "directshowutils.h" + + +QT_BEGIN_NAMESPACE + +// Previously contained in <qedit.h>. +static const IID iID_ISampleGrabber = { 0x6B652FFF, 0x11FE, 0x4fce, { 0x92, 0xAD, 0x02, 0x66, 0xB5, 0xD7, 0xC7, 0x8F } }; +static const CLSID cLSID_SampleGrabber = { 0xC1F400A0, 0x3F08, 0x11d3, { 0x9F, 0x0B, 0x00, 0x60, 0x08, 0x03, 0x9E, 0x37 } }; + +class SampleGrabberCallbackPrivate : public ISampleGrabberCB +{ +public: + explicit SampleGrabberCallbackPrivate(DirectShowSampleGrabber *grabber) + : m_ref(1) + , m_grabber(grabber) + { } + + virtual ~SampleGrabberCallbackPrivate() { } + + STDMETHODIMP_(ULONG) AddRef() + { + return InterlockedIncrement(&m_ref); + } + + STDMETHODIMP_(ULONG) Release() + { + ULONG ref = InterlockedDecrement(&m_ref); + if (ref == 0) + delete this; + return ref; + } + + STDMETHODIMP QueryInterface(REFIID riid, void **ppvObject) + { + if (NULL == ppvObject) + return E_POINTER; + + if (riid == IID_IUnknown /*__uuidof(IUnknown) */ ) { + AddRef(); + *ppvObject = static_cast<IUnknown *>(this); + return S_OK; + } else if (riid == IID_ISampleGrabberCB /*__uuidof(ISampleGrabberCB)*/ ) { + AddRef(); + *ppvObject = static_cast<ISampleGrabberCB *>(this); + return S_OK; + } + return E_NOTIMPL; + } + + STDMETHODIMP SampleCB(double time, IMediaSample *mediaSample) + { + if (m_grabber) + Q_EMIT m_grabber->sampleAvailable(time, mediaSample); + + return S_OK; + } + + STDMETHODIMP BufferCB(double time, BYTE *buffer, long bufferLen) + { + if (m_grabber) + Q_EMIT m_grabber->bufferAvailable(time, buffer, bufferLen); + + return S_OK; + } + +private: + ULONG m_ref; + DirectShowSampleGrabber *m_grabber; +}; + +DirectShowSampleGrabber::DirectShowSampleGrabber(QObject *p) + : QObject(p) + , m_sampleGrabber(nullptr) + , m_sampleGabberCb(nullptr) + , m_callbackType(CallbackMethod::BufferCB) +{ + // Create sample grabber filter + HRESULT hr = CoCreateInstance(cLSID_SampleGrabber, NULL, CLSCTX_INPROC, iID_ISampleGrabber, reinterpret_cast<void **>(&m_sampleGrabber)); + + if (FAILED(hr)) { + qCWarning(qtDirectShowPlugin, "Failed to create sample grabber"); + return; + } + + hr = m_sampleGrabber->QueryInterface(IID_IBaseFilter, reinterpret_cast<void **>(&m_filter)); + if (FAILED(hr)) + qCWarning(qtDirectShowPlugin, "Failed to get base filter interface"); +} + +DirectShowSampleGrabber::~DirectShowSampleGrabber() +{ + stop(); + SAFE_RELEASE(m_sampleGabberCb); + SAFE_RELEASE(m_filter); + SAFE_RELEASE(m_sampleGrabber); +} + +void DirectShowSampleGrabber::stop() +{ + if (!m_sampleGrabber) + return; + + if (FAILED(m_sampleGrabber->SetCallback(nullptr, static_cast<long>(m_callbackType)))) { + qCWarning(qtDirectShowPlugin, "Failed to stop sample grabber callback"); + return; + } +} + +bool DirectShowSampleGrabber::getConnectedMediaType(AM_MEDIA_TYPE *mediaType) +{ + Q_ASSERT(mediaType); + + if (!isValid()) + return false; + + if (FAILED(m_sampleGrabber->GetConnectedMediaType(mediaType))) { + qCWarning(qtDirectShowPlugin, "Failed to retrieve the connected media type"); + return false; + } + + return true; +} + +bool DirectShowSampleGrabber::setMediaType(const AM_MEDIA_TYPE *mediaType) +{ + Q_ASSERT(mediaType); + + if (FAILED(m_sampleGrabber->SetMediaType(mediaType))) { + qCWarning(qtDirectShowPlugin, "Failed to set media type"); + return false; + } + + return true; +} + +void DirectShowSampleGrabber::start(DirectShowSampleGrabber::CallbackMethod method, + bool oneShot, + bool bufferSamples) +{ + if (!m_sampleGrabber) + return; + + stop(); + + if (!m_sampleGabberCb) + m_sampleGabberCb = new SampleGrabberCallbackPrivate(this); + + m_callbackType = method; + m_sampleGrabber->SetCallback(m_sampleGabberCb, static_cast<long>(method)); + m_sampleGrabber->SetOneShot(oneShot); + m_sampleGrabber->SetBufferSamples(bufferSamples); +} + +QT_END_NAMESPACE |