Segmentation Fault in QAudioOutputPrivate::freeBlocks() caused by wrong pointer increment

This is related to #QTBUG-9875 but describes the real bug there.

In src/multimedia/audio/qaudiooutput_win32_p.cpp:

void QAudioOutputPrivate::freeBlocks(WAVEHDR* blockArray)
{
    WAVEHDR* blocks = blockArray;

    int count = buffer_size/period_size;

    for(int i = 0; i < count; i++) {
        waveOutUnprepareHeader(hWaveOut,blocks, sizeof(WAVEHDR));
        blocks+=sizeof(WAVEHDR);
    }
    HeapFree(GetProcessHeap(), 0, blockArray);
}

The line blocks+=sizeof(WAVEHDR); increments blocks by 0x400 instead of 0x20 which results (depending on the audio file) in a segmentation fault.
This is because blocks is of type WAVEHDR* and not BYTE*.

So you must use blocks++; instead; or you go back to version 4.6.2 (which uses &blocks[i] as parameter) and remove the increment completely (because i is already incremented by the loop.

Addendum: Same problem in void QAudioInputPrivate::freeBlocks(WAVEHDR* blockArray)

Best regards,
Hoffi