samplegrabber.cpp

Go to the documentation of this file.

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "samplegrabber_p.h"
 
STDMETHODIMP SampleGrabberCallback::QueryInterface(REFIID riid, void** ppv)
{
    if (!ppv)
        return E_POINTER;
    if (riid == IID_IMFSampleGrabberSinkCallback) {
        *ppv = static_cast<IMFSampleGrabberSinkCallback*>(this);
    } else if (riid == IID_IMFClockStateSink) {
        *ppv = static_cast<IMFClockStateSink*>(this);
    } else if (riid == IID_IUnknown) {
        *ppv = static_cast<IUnknown*>(this);
    } else {
        *ppv =  NULL;
        return E_NOINTERFACE;
    }
    AddRef();
    return S_OK;
}
 
STDMETHODIMP_(ULONG) SampleGrabberCallback::AddRef()
{
    return InterlockedIncrement(&m_cRef);
}
 
STDMETHODIMP_(ULONG) SampleGrabberCallback::Release()
{
    ULONG cRef = InterlockedDecrement(&m_cRef);
    if (cRef == 0) {
        delete this;
    }
    return cRef;
 
}
 
// IMFClockStateSink methods.
 
STDMETHODIMP SampleGrabberCallback::OnClockStart(MFTIME hnsSystemTime, LONGLONG llClockStartOffset)
{
    Q_UNUSED(hnsSystemTime);
    Q_UNUSED(llClockStartOffset);
    return S_OK;
}
 
STDMETHODIMP SampleGrabberCallback::OnClockStop(MFTIME hnsSystemTime)
{
    Q_UNUSED(hnsSystemTime);
    return S_OK;
}
 
STDMETHODIMP SampleGrabberCallback::OnClockPause(MFTIME hnsSystemTime)
{
    Q_UNUSED(hnsSystemTime);
    return S_OK;
}
 
STDMETHODIMP SampleGrabberCallback::OnClockRestart(MFTIME hnsSystemTime)
{
    Q_UNUSED(hnsSystemTime);
    return S_OK;
}
 
STDMETHODIMP SampleGrabberCallback::OnClockSetRate(MFTIME hnsSystemTime, float flRate)
{
    Q_UNUSED(hnsSystemTime);
    Q_UNUSED(flRate);
    return S_OK;
}
 
// IMFSampleGrabberSink methods.
 
STDMETHODIMP SampleGrabberCallback::OnSetPresentationClock(IMFPresentationClock* pClock)
{
    Q_UNUSED(pClock);
    return S_OK;
}
 
STDMETHODIMP SampleGrabberCallback::OnShutdown()
{
    return S_OK;
}
 
//void AudioSampleGrabberCallback::addProbe(MFAudioProbeControl* probe)
//{
//    QMutexLocker locker(&m_audioProbeMutex);
 
//    if (m_audioProbes.contains(probe))
//        return;
 
//    m_audioProbes.append(probe);
//}
 
//void AudioSampleGrabberCallback::removeProbe(MFAudioProbeControl* probe)
//{
//    QMutexLocker locker(&m_audioProbeMutex);
//    m_audioProbes.removeOne(probe);
//}
 
void AudioSampleGrabberCallback::setFormat(const QAudioFormat& format)
{
    m_format = format;
}
 
STDMETHODIMP AudioSampleGrabberCallback::OnProcessSample(REFGUID guidMajorMediaType, DWORD dwSampleFlags,
    LONGLONG llSampleTime, LONGLONG llSampleDuration, const BYTE * pSampleBuffer,
    DWORD dwSampleSize)
{
    Q_UNUSED(dwSampleFlags);
    Q_UNUSED(llSampleTime);
    Q_UNUSED(llSampleDuration);
    Q_UNUSED(pSampleBuffer);
    Q_UNUSED(dwSampleSize);
 
    if (guidMajorMediaType != GUID_NULL && guidMajorMediaType != MFMediaType_Audio)
        return S_OK;
 
    QMutexLocker locker(&m_audioProbeMutex);
 
//    if (m_audioProbes.isEmpty())
        return S_OK;
 
    // Check if sample has a presentation time
    if (llSampleTime == _I64_MAX) {
        // Set default QAudioBuffer start time
        llSampleTime = -1;
    } else {
        // WMF uses 100-nanosecond units, Qt uses microseconds
        llSampleTime /= 10;
    }
 
//    for (MFAudioProbeControl* probe : std::as_const(m_audioProbes))
//        probe->bufferProbed((const char*)pSampleBuffer, dwSampleSize, m_format, llSampleTime);
 
    return S_OK;
}