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/****************************************************************************
**
** 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
{
Q_DISABLE_COPY(SampleGrabberCallbackPrivate)
public:
explicit SampleGrabberCallbackPrivate(DirectShowSampleGrabber *grabber)
: m_ref(1)
, m_grabber(grabber)
{ }
virtual ~SampleGrabberCallbackPrivate() = default;
STDMETHODIMP_(ULONG) AddRef() override
{
return InterlockedIncrement(&m_ref);
}
STDMETHODIMP_(ULONG) Release() override
{
ULONG ref = InterlockedDecrement(&m_ref);
if (ref == 0)
delete this;
return ref;
}
STDMETHODIMP QueryInterface(REFIID riid, void **ppvObject) override
{
if (nullptr == ppvObject)
return E_POINTER;
if (riid == IID_IUnknown /*__uuidof(IUnknown) */ ) {
AddRef();
*ppvObject = static_cast<IUnknown *>(this);
return S_OK;
}
if (riid == IID_ISampleGrabberCB /*__uuidof(ISampleGrabberCB)*/ ) {
AddRef();
*ppvObject = static_cast<ISampleGrabberCB *>(this);
return S_OK;
}
return E_NOTIMPL;
}
STDMETHODIMP SampleCB(double time, IMediaSample *mediaSample) override
{
if (m_grabber)
Q_EMIT m_grabber->sampleAvailable(time, mediaSample);
return S_OK;
}
STDMETHODIMP BufferCB(double time, BYTE *buffer, long bufferLen) override
{
if (m_grabber) {
// Deep copy, the data might be modified or freed after the callback returns
QByteArray data(reinterpret_cast<const char *>(buffer), bufferLen);
Q_EMIT m_grabber->bufferAvailable(time, data);
}
return S_OK;
}
private:
ULONG m_ref;
DirectShowSampleGrabber *m_grabber;
};
DirectShowSampleGrabber::DirectShowSampleGrabber(QObject *p)
: QObject(p)
{
// Create sample grabber filter
HRESULT hr = CoCreateInstance(cLSID_SampleGrabber, nullptr, 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
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