virtual bool IsSeekable() const
{
if (IsMedia())
return fMedia->IsSeekable();
return fPosition != NULL;
}
BMediaIOWrapper(BDataIO* source)
:
fData(NULL),
fPosition(NULL),
fMedia(NULL),
fBufferIO(NULL),
fDataIOAdapter(NULL),
fErr(B_NO_ERROR)
{
CALLED();
fPosition = dynamic_cast<BPositionIO*>(source);
fMedia = dynamic_cast<BMediaIO*>(source);
fBufferIO = dynamic_cast<BBufferIO *>(source);
fData = source;
// No need to do additional buffering if we have
// a BBufferIO or a BMediaIO.
if (!IsMedia() && fBufferIO == NULL) {
// Source needs to be at least a BPositionIO to wrap with a BBufferIO
if (IsPosition()) {
fBufferIO = new(std::nothrow) BBufferIO(fPosition, 65536, false);
if (fBufferIO == NULL) {
fErr = B_NO_MEMORY;
return;
}
// We have to reset our parents reference too
fPosition = dynamic_cast<BPositionIO*>(fBufferIO);
fData = dynamic_cast<BDataIO*>(fPosition);
} else {
// In this case we have to supply our own form
// of pseudo-seekable object from a non-seekable
// BDataIO.
fDataIOAdapter = new DataIOAdapter(source);
fMedia = dynamic_cast<BMediaIO*>(fDataIOAdapter);
fPosition = dynamic_cast<BPositionIO*>(fDataIOAdapter);
fData = dynamic_cast<BDataIO*>(fDataIOAdapter);
TRACE("Unable to improve performance with a BufferIO\n");
}
}
if (IsMedia())
fMedia->GetFlags(&fFlags);
else if (IsPosition())
fFlags = B_MEDIA_SEEKABLE;
}
virtual bool IsEndless() const
{
if (IsMedia())
return fMedia->IsEndless();
if (IsSeekable())
return false;
return true;
}
