//-------------------------------------------------------------------------------------------------
HRESULT classMMPLAYER::Play (LPSTR argName)
{
WCHAR wFileName[MAX_PATH];
HRESULT hr;
IPin *pPin = NULL;
DWORD dwAttr = GetFileAttributes(argName);
if (dwAttr == (DWORD) -1)
return ERROR_FILE_NOT_FOUND;
#ifndef UNICODE
MultiByteToWideChar(CP_ACP, 0, argName, -1, wFileName, MAX_PATH);
#else
lstrcpy(wFileName, argName);
#endif
hr = m_pGraphBuilder->AddSourceFilter(wFileName, wFileName, &m_pSourceNext);
if ( SUCCEEDED(hr) )
{
hr = m_pSourceNext->FindPin(L"Output", &pPin);
}
if ( SUCCEEDED(hr) )
{
hr = m_pMediaControl->Stop();
}
if (SUCCEEDED(hr)) {
IEnumFilters *pFilterEnum = NULL;
IBaseFilter *pFilterTemp = NULL;
if(SUCCEEDED(hr = m_pGraphBuilder->EnumFilters(&pFilterEnum))){
int iFiltCount = 0;
int iPos = 0;
while( S_OK == pFilterEnum->Skip(1)){
iFiltCount++;
}
IBaseFilter **ppFilters = reinterpret_cast<IBaseFilter **>(_alloca(sizeof(IBaseFilter *) *iFiltCount));
pFilterEnum->Reset();
while(S_OK == pFilterEnum->Next(1, &(ppFilters[iPos++]), NULL));
SAFE_RELEASE(pFilterEnum);
for(iPos = 0;iPos < iFiltCount; iPos++){
m_pGraphBuilder->RemoveFilter(ppFilters[iPos]);
if(ppFilters[iPos] != m_pSourceCurrent)
{
m_pGraphBuilder->AddFilter(ppFilters[iPos], NULL);
}
SAFE_RELEASE(ppFilters[iPos]);
}
}
}
if ( SUCCEEDED(hr) ) {
hr = m_pGraphBuilder->Render(pPin);
m_pSourceCurrent = m_pSourceNext;
m_pSourceNext = NULL;
}
SAFE_RELEASE(pPin);
if ( SUCCEEDED(hr) ) {
LONGLONG IIPos = 0;
hr = m_pMediaSeeking->SetPositions(&IIPos, AM_SEEKING_AbsolutePositioning,
&IIPos, AM_SEEKING_NoPositioning);
}
if ( SUCCEEDED(hr) ) {
hr = m_pMediaControl->Run();
}
SAFE_RELEASE(m_pSourceCurrent);
return S_OK;
}
BOOL CMP3Player::OnPlayAudio( TCHAR* szName, BOOL bLooped /*= FALSE */ )
{
//WCHAR wstrFileName[MAX_PATH];
HRESULT hr;
IPin *pPin = NULL;
// Make sure that this file exists
DWORD dwAttr = GetFileAttributes(szName);
if (dwAttr == (DWORD) -1)
{
return FALSE;
}
// OPTIMIZATION OPPORTUNITY
// This will open the file, which is expensive. To optimize, this
// should be done earlier, ideally as soon as we knew this was the
// next file to ensure that the file load doesn't add to the
// filter swapping time & cause a hiccup.
//
// Add the new source filter to the graph. (Graph can still be running)
hr = m_pGraphBuilder->AddSourceFilter(szName,szName, &m_pSourceNext);
// Get the first output pin of the new source filter. Audio sources
// typically have only one output pin, so for most audio cases finding
// any output pin is sufficient.
if (SUCCEEDED(hr)) {
hr = m_pSourceNext->FindPin(L"Output", &pPin);
}
// Stop the graph
if (SUCCEEDED(hr)) {
hr = m_pMediaControl->Stop();
}
// Break all connections on the filters. You can do this by adding
// and removing each filter in the graph
if (SUCCEEDED(hr)) {
IEnumFilters *pFilterEnum = NULL;
if (SUCCEEDED(hr = m_pGraphBuilder->EnumFilters(&pFilterEnum))) {
int iFiltCount = 0;
int iPos = 0;
// Need to know how many filters. If we add/remove filters during the
// enumeration we'll invalidate the enumerator
while (S_OK == pFilterEnum->Skip(1)) {
iFiltCount++;
}
// Allocate space, then pull out all of the
IBaseFilter **ppFilters = reinterpret_cast<IBaseFilter **>
(_alloca(sizeof(IBaseFilter *) * iFiltCount));
pFilterEnum->Reset();
while (S_OK == pFilterEnum->Next(1, &(ppFilters[iPos++]), NULL));
SAFE_RELEASE(pFilterEnum);
for (iPos = 0; iPos < iFiltCount; iPos++) {
m_pGraphBuilder->RemoveFilter(ppFilters[iPos]);
// Put the filter back, unless it is the old source
if (ppFilters[iPos] != m_pSourceCurrent) {
m_pGraphBuilder->AddFilter(ppFilters[iPos], NULL);
}
SAFE_RELEASE(ppFilters[iPos]);
}
}
}
// We have the new ouput pin. Render it
if (SUCCEEDED(hr)) {
hr = m_pGraphBuilder->Render(pPin);
m_pSourceCurrent = m_pSourceNext;
m_pSourceNext = NULL;
}
SAFE_RELEASE(pPin);
SAFE_RELEASE(m_pSourceNext); // In case of errors
// Re-seek the graph to the beginning
if (SUCCEEDED(hr)) {
LONGLONG llPos = 0;
hr = m_pMediaSeeking->SetPositions(&llPos, AM_SEEKING_AbsolutePositioning,
&llPos, AM_SEEKING_NoPositioning);
}
// Start the graph
if (SUCCEEDED(hr)) {
hr = m_pMediaControl->Run();
}
// Release the old source filter.
SAFE_RELEASE(m_pSourceCurrent);
return TRUE;
}