QMemoryAudioBufferProvider(const void *data, int frameCount, const QAudioFormat &format, qint64 startTime)
: mStartTime(startTime)
, mFrameCount(frameCount)
, mFormat(format)
{
int numBytes = format.bytesForFrames(frameCount);
if (numBytes > 0) {
mBuffer = malloc(numBytes);
if (!mBuffer) {
// OOM, if that's likely
mStartTime = -1;
mFrameCount = 0;
mFormat = QAudioFormat();
} else {
// Allocated, see if we have data to copy
if (data) {
memcpy(mBuffer, data, numBytes);
} else {
// We have to fill with the zero value..
switch (format.sampleType()) {
case QAudioFormat::SignedInt:
// Signed int means 0x80, 0x8000 is zero
// XXX this is not right for > 8 bits(0x8080 vs 0x8000)
memset(mBuffer, 0x80, numBytes);
break;
default:
memset(mBuffer, 0x0, numBytes);
}
}
}
} else
mBuffer = 0;
}
