Hi again.... As you know (or not) I´m developing a game for windows mobile 6, another problem with which I have encountered is framerate when the game start to reproduce a sound....

First to all, I manage to reproduce midi, wav, aac and amr... not mp3... but it´s another problem.....

so... I´m using following code:

===============================================================================
bool SoundPlayer::realize()
{
    // Cleaning GraphFilter
    if(pGraph != NULL)
    {
        return true;
    }

    // Initializing the COM library on the current thread.
    HRESULT hr;
    hr = CoInitialize(NULL);
    if (FAILED(hr))
    {
        printf("ERROR - Could not initialize COM library.\n");
        return false;
    }

    // Creating an instance of the Filter Graph Manager.
    hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);
    if (FAILED(hr))
    {
        printf("ERROR - Could not create the Filter Graph Manager.\n");
        return false;
    }

    // Asking to Graph for interfaces.
    hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
    if (FAILED(hr))
    {
        printf("ERROR - Could not retrieve pointer to IMediaControl interface.\n");
        return false;
    }

    hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
    if (FAILED(hr))
    {
        printf("ERROR - Could not retrieve pointer to IMediaEvent interface.\n");
        return false;
    }

    hr = pGraph->QueryInterface(IID_IMediaSeeking, (void **)&pSeeking);
    if (FAILED(hr))
    {
        printf("ERROR - Could not retrieve pointer to IMediaSeeking interface.\n");
        return false;
    }

    hr = pGraph->QueryInterface(IID_IBasicAudio, (void **)&pAudio);
    if (FAILED(hr))
    {
        printf("ERROR - Could not retrieve pointer to IBasicAudio interface.\n");
        return false;
    }

    // Constructing a filter graph that will play the specified file.
    hr = pGraph->RenderFile(soundFileNameW, NULL);
    if (FAILED(hr))
    {
        printf("ERROR - Could not construct a filter graph that will play the specified file.");
        return false;
    }

}

bool SoundPlayer::start()
{
    if(!realize())
    {
        return false;
    }

    // Switching the entire filter graph to running state.
    HRESULT hr;
    hr = pControl->Run();
    if (FAILED(hr))
    {
        printf("ERROR - Could not switch filter graph to running state.\n");
        return false;
    }

    return true;
}

bool SoundPlayer::stop()
{
    // Switching the entire filter graph to stopped state.
    HRESULT hr;
    hr = pControl->Stop();
    if (FAILED(hr))
    {
        printf("ERROR - Could not switch filter graph to stopped state.\n");
        return false;
    }

    return true;
}

void SoundPlayer::close()
{
    // Releasing graph and COM.
    pAudio->Release();
    pAudio = NULL;

    pSeeking->Release();
    pSeeking = NULL;

    pEvent->Release();
    pEvent = NULL;

    pControl->Release();
    pControl = NULL;

    pGraph->Release();
    pGraph = NULL;

    CoUninitialize();
}
===============================================================================

The problem is that when a sound starts I need to render it again (realize function), and add the filters too.... then run the graph (start function).... this operation decreases the framerate significantly just for a second or two.... but it´s really annoying....

so, there is a way to hold the sound "realized" and only execute run operation?....

other observation... when the sound finishes, the thread which appears to contains the graphFilter is destroyed....

best regards...