Solved Program crashes trying to play audio using QAudioOutput

[ERSUCC]

I am trying to use QAudioOutput to play an endless sine wave from a byte array. When I run it, the program crashes just after the audio device's state changes to ActiveState. When I use debugging mode, it says the crash occurs in QBuffer::readData(). Here is the creation of the buffer I am trying to use:

QByteArray buffer;

for (int i = 0; i < SAMPLE_RATE; i++)
{
    buffer.append(QString("%1").arg(sin(2 * M_PI * (double)i / SAMPLE_RATE)));
}

audioPlayer->play(&buffer);

Here is the play function in AudioPlayer:

void AudioPlayer::play(QByteArray *data)
{
    QMetaObject::invokeMethod(&audioThread, "play", Qt::QueuedConnection, Q_ARG(QByteArray, *data));
}

Here is the play function in AudioThread (buffer is a QBuffer member variable):

void AudioThread::play(QByteArray data)
{
    buffer.setBuffer(&data);
    buffer.open(QIODevice::ReadOnly);

    audioOutput->setBufferSize(buffer.size());
    audioOutput->start(&buffer);
}

The last line of play in AudioThread is the last line that I can trace in my code before the error occurs, and I'm guessing it is the line with the problem, because I never hear any audio. Thanks in advance for your help, and let me know if I should include any other sections of my code.

[Bonnie]

@ERSUCC said in Program crashes trying to play audio using QAudioOutput:

buffer.setBuffer(&data);

I think this line is the cause of the crash.
data here is a local variable, it will be destroyed at the end of this function.
You set buffer to use it as internal buffer, but it is not accessible after that.

void QBuffer::setBuffer(QByteArray *byteArray)
...
The caller is responsible for ensuring that byteArray remains valid until the QBuffer is destroyed, or until setBuffer() is called to change the buffer.

Try use buffer.setData(data) instead.

[ERSUCC]

That worked! Thank you so much!