HRESULT CVideoTransformFilter::Receive(IMediaSample *pSample)
{
// If the next filter downstream is the video renderer, then it may
// be able to operate in DirectDraw mode which saves copying the data
// and gives higher performance. In that case the buffer which we
// get from GetDeliveryBuffer will be a DirectDraw buffer, and
// drawing into this buffer draws directly onto the display surface.
// This means that any waiting for the correct time to draw occurs
// during GetDeliveryBuffer, and that once the buffer is given to us
// the video renderer will count it in its statistics as a frame drawn.
// This means that any decision to drop the frame must be taken before
// calling GetDeliveryBuffer.
ASSERT(CritCheckIn(&m_csReceive));
AM_MEDIA_TYPE *pmtOut, *pmt;
#ifdef _DEBUG
FOURCCMap fccOut;
#endif
HRESULT hr;
ASSERT(pSample);
IMediaSample * pOutSample;
// If no output pin to deliver to then no point sending us data
ASSERT (m_pOutput != NULL) ;
// The source filter may dynamically ask us to start transforming from a
// different media type than the one we're using now. If we don't, we'll
// draw garbage. (typically, this is a palette change in the movie,
// but could be something more sinister like the compression type changing,
// or even the video size changing)
#define rcS1 ((VIDEOINFOHEADER *)(pmt->pbFormat))->rcSource
#define rcT1 ((VIDEOINFOHEADER *)(pmt->pbFormat))->rcTarget
pSample->GetMediaType(&pmt);
if (pmt != NULL && pmt->pbFormat != NULL) {
// spew some debug output
ASSERT(!IsEqualGUID(pmt->majortype, GUID_NULL));
#ifdef _DEBUG
fccOut.SetFOURCC(&pmt->subtype);
LONG lCompression = HEADER(pmt->pbFormat)->biCompression;
LONG lBitCount = HEADER(pmt->pbFormat)->biBitCount;
LONG lStride = (HEADER(pmt->pbFormat)->biWidth * lBitCount + 7) / 8;
lStride = (lStride + 3) & ~3;
DbgLog((LOG_TRACE,3,TEXT("*Changing input type on the fly to")));
DbgLog((LOG_TRACE,3,TEXT("FourCC: %lx Compression: %lx BitCount: %ld"),
fccOut.GetFOURCC(), lCompression, lBitCount));
DbgLog((LOG_TRACE,3,TEXT("biHeight: %ld rcDst: (%ld, %ld, %ld, %ld)"),
HEADER(pmt->pbFormat)->biHeight,
rcT1.left, rcT1.top, rcT1.right, rcT1.bottom));
DbgLog((LOG_TRACE,3,TEXT("rcSrc: (%ld, %ld, %ld, %ld) Stride: %ld"),
rcS1.left, rcS1.top, rcS1.right, rcS1.bottom,
lStride));
#endif
// now switch to using the new format. I am assuming that the
// derived filter will do the right thing when its media type is
// switched and streaming is restarted.
StopStreaming();
m_pInput->CurrentMediaType() = *pmt;
DeleteMediaType(pmt);
// if this fails, playback will stop, so signal an error
hr = StartStreaming();
if (FAILED(hr)) {
return AbortPlayback(hr);
}
}
// Now that we have noticed any format changes on the input sample, it's
// OK to discard it.
if (ShouldSkipFrame(pSample)) {
MSR_NOTE(m_idSkip);
m_bSampleSkipped = TRUE;
return NOERROR;
}
// Set up the output sample
hr = InitializeOutputSample(pSample, &pOutSample);
if (FAILED(hr)) {
return hr;
}
m_bSampleSkipped = FALSE;
// The renderer may ask us to on-the-fly to start transforming to a
// different format. If we don't obey it, we'll draw garbage
#define rcS ((VIDEOINFOHEADER *)(pmtOut->pbFormat))->rcSource
#define rcT ((VIDEOINFOHEADER *)(pmtOut->pbFormat))->rcTarget
pOutSample->GetMediaType(&pmtOut);
if (pmtOut != NULL && pmtOut->pbFormat != NULL) {
// spew some debug output
ASSERT(!IsEqualGUID(pmtOut->majortype, GUID_NULL));
#ifdef _DEBUG
fccOut.SetFOURCC(&pmtOut->subtype);
LONG lCompression = HEADER(pmtOut->pbFormat)->biCompression;
LONG lBitCount = HEADER(pmtOut->pbFormat)->biBitCount;
LONG lStride = (HEADER(pmtOut->pbFormat)->biWidth * lBitCount + 7) / 8;
lStride = (lStride + 3) & ~3;
DbgLog((LOG_TRACE,3,TEXT("*Changing output type on the fly to")));
DbgLog((LOG_TRACE,3,TEXT("FourCC: %lx Compression: %lx BitCount: %ld"),
fccOut.GetFOURCC(), lCompression, lBitCount));
DbgLog((LOG_TRACE,3,TEXT("biHeight: %ld rcDst: (%ld, %ld, %ld, %ld)"),
HEADER(pmtOut->pbFormat)->biHeight,
rcT.left, rcT.top, rcT.right, rcT.bottom));
DbgLog((LOG_TRACE,3,TEXT("rcSrc: (%ld, %ld, %ld, %ld) Stride: %ld"),
rcS.left, rcS.top, rcS.right, rcS.bottom,
lStride));
#endif
// now switch to using the new format. I am assuming that the
// derived filter will do the right thing when its media type is
// switched and streaming is restarted.
StopStreaming();
m_pOutput->CurrentMediaType() = *pmtOut;
DeleteMediaType(pmtOut);
hr = StartStreaming();
if (SUCCEEDED(hr)) {
// a new format, means a new empty buffer, so wait for a keyframe
// before passing anything on to the renderer.
// !!! a keyframe may never come, so give up after 30 frames
DbgLog((LOG_TRACE,3,TEXT("Output format change means we must wait for a keyframe")));
m_nWaitForKey = 30;
// if this fails, playback will stop, so signal an error
} else {
// Must release the sample before calling AbortPlayback
// because we might be holding the win16 lock or
// ddraw lock
pOutSample->Release();
AbortPlayback(hr);
return hr;
}
}
// After a discontinuity, we need to wait for the next key frame
if (pSample->IsDiscontinuity() == S_OK) {
DbgLog((LOG_TRACE,3,TEXT("Non-key discontinuity - wait for keyframe")));
m_nWaitForKey = 30;
}
// Start timing the transform (and log it if PERF is defined)
if (SUCCEEDED(hr)) {
m_tDecodeStart = timeGetTime();
MSR_START(m_idTransform);
// have the derived class transform the data
hr = Transform(pSample, pOutSample);
// Stop the clock (and log it if PERF is defined)
MSR_STOP(m_idTransform);
m_tDecodeStart = timeGetTime()-m_tDecodeStart;
m_itrAvgDecode = m_tDecodeStart*(10000/16) + 15*(m_itrAvgDecode/16);
// Maybe we're waiting for a keyframe still?
if (m_nWaitForKey)
m_nWaitForKey--;
if (m_nWaitForKey && pSample->IsSyncPoint() == S_OK)
m_nWaitForKey = FALSE;
// if so, then we don't want to pass this on to the renderer
if (m_nWaitForKey && hr == NOERROR) {
DbgLog((LOG_TRACE,3,TEXT("still waiting for a keyframe")));
hr = S_FALSE;
}
}
if (FAILED(hr)) {
DbgLog((LOG_TRACE,1,TEXT("Error from video transform")));
} else {
// the Transform() function can return S_FALSE to indicate that the
// sample should not be delivered; we only deliver the sample if it's
// really S_OK (same as NOERROR, of course.)
// Try not to return S_FALSE to a direct draw buffer (it's wasteful)
// Try to take the decision earlier - before you get it.
if (hr == NOERROR) {
hr = m_pOutput->Deliver(pOutSample);
} else {
// S_FALSE returned from Transform is a PRIVATE agreement
// We should return NOERROR from Receive() in this case because returning S_FALSE
// from Receive() means that this is the end of the stream and no more data should
// be sent.
if (S_FALSE == hr) {
// We must Release() the sample before doing anything
// like calling the filter graph because having the
// sample means we may have the DirectDraw lock
// (== win16 lock on some versions)
pOutSample->Release();
m_bSampleSkipped = TRUE;
if (!m_bQualityChanged) {
m_bQualityChanged = TRUE;
NotifyEvent(EC_QUALITY_CHANGE,0,0);
}
return NOERROR;
}
}
}
// release the output buffer. If the connected pin still needs it,
// it will have addrefed it itself.
pOutSample->Release();
ASSERT(CritCheckIn(&m_csReceive));
return hr;
}
HRESULT CBufferFilter::Receive(IMediaSample* pSample)
{
/* Check for other streams and pass them on */
AM_SAMPLE2_PROPERTIES* const pProps = m_pInput->SampleProps();
if(pProps->dwStreamId != AM_STREAM_MEDIA)
return m_pOutput->Deliver(pSample);
HRESULT hr;
ASSERT(pSample);
IMediaSample* pOutSample;
ASSERT(m_pOutput != NULL);
// Set up the output sample
hr = InitializeOutputSample(pSample, &pOutSample);
if(FAILED(hr))
return hr;
// Start timing the transform (if PERF is defined)
MSR_START(m_idTransform);
// have the derived class transform the data
hr = Transform(pSample, pOutSample);
// Stop the clock and log it (if PERF is defined)
MSR_STOP(m_idTransform);
if(FAILED(hr)) {
DbgLog((LOG_TRACE,1,TEXT("Error from transform")));
}
else {
// the Transform() function can return S_FALSE to indicate that the
// sample should not be delivered; we only deliver the sample if it's
// really S_OK (same as NOERROR, of course.)
if(hr == NOERROR) {
hr = m_pOutput->Deliver(pOutSample);
m_bSampleSkipped = FALSE; // last thing no longer dropped
}
else {
// S_FALSE returned from Transform is a PRIVATE agreement
// We should return NOERROR from Receive() in this cause because returning S_FALSE
// from Receive() means that this is the end of the stream and no more data should
// be sent.
if(S_FALSE == hr) {
// Release the sample before calling notify to avoid
// deadlocks if the sample holds a lock on the system
// such as DirectDraw buffers do
pOutSample->Release();
m_bSampleSkipped = TRUE;
if(!m_bQualityChanged) {
NotifyEvent(EC_QUALITY_CHANGE,0,0);
m_bQualityChanged = TRUE;
}
return NOERROR;
}
}
}
// release the output buffer. If the connected pin still needs it,
// it will have addrefed it itself.
pOutSample->Release();
return hr;
}
HRESULT
CTransInPlaceFilter::Receive(IMediaSample *pSample)
{
/* Check for other streams and pass them on */
AM_SAMPLE2_PROPERTIES * const pProps = m_pInput->SampleProps();
if (pProps->dwStreamId != AM_STREAM_MEDIA) {
return m_pOutput->Deliver(pSample);
}
HRESULT hr;
// Start timing the TransInPlace (if PERF is defined)
MSR_START(m_idTransInPlace);
if (UsingDifferentAllocators()) {
// We have to copy the data.
pSample = Copy(pSample);
if (pSample==NULL) {
MSR_STOP(m_idTransInPlace);
return E_UNEXPECTED;
}
}
// have the derived class transform the data
hr = Transform(pSample);
// Stop the clock and log it (if PERF is defined)
MSR_STOP(m_idTransInPlace);
if (FAILED(hr)) {
DbgLog((LOG_TRACE, 1, TEXT("Error from TransInPlace")));
if (UsingDifferentAllocators()) {
pSample->Release();
}
return hr;
}
// the Transform() function can return S_FALSE to indicate that the
// sample should not be delivered; we only deliver the sample if it's
// really S_OK (same as NOERROR, of course.)
if (hr == NOERROR) {
hr = m_pOutput->Deliver(pSample);
} else {
// But it would be an error to return this private workaround
// to the caller ...
if (S_FALSE == hr) {
// S_FALSE returned from Transform is a PRIVATE agreement
// We should return NOERROR from Receive() in this cause because
// returning S_FALSE from Receive() means that this is the end
// of the stream and no more data should be sent.
m_bSampleSkipped = TRUE;
if (!m_bQualityChanged) {
NotifyEvent(EC_QUALITY_CHANGE,0,0);
m_bQualityChanged = TRUE;
}
hr = NOERROR;
}
}
// release the output buffer. If the connected pin still needs it,
// it will have addrefed it itself.
if (UsingDifferentAllocators()) {
pSample->Release();
}
return hr;
} // Receive
