How to write audio data while playing sound?

name101

I want to append data to the existing buffer so that the sound comes out continuously .
so I tried QIODevice::ReadWrite of Qbuffer's openmode but I do not hear anything.(If QIODevice::ReadOnly is work well.)

QByteArray part;
inputFile.open(QIODevice::ReadWrite);
part=inputFile.read(inputFile.size()/4);
buffer.write(part);
audioOutput->setNotifyInterval(4000);
connect(audioOutput,SIGNAL(notify()),this,SLOT(appendData()));
audioOutput->start(&buffer);

void Widget::appendData()
{
part=inputFile.read(inputFile.size()/4);
buffer.write(part);
}

SGaist

Hi,

What is that buffer ?
Where do you create it ?
What version of Qt are you using ?
What platform are you running Qt on ?

name101

buffer is QBuffer. version 5.11.1 and windows10.
I just want to append data in the sound buffer while the sound is playing. Like streaming.

SGaist

Are you checking the state of the audioOutput object for errors ?

On a related note, why not pass inputFile to audioOutput->start rather than passing through a buffer ?

name101

Since audioOutput returns ActiveState, it seems to be no problem.
The reason I do not use inputfile(QFile) is to decode and play the file directly using libav(ffmpeg).

name101

I solve it by using QDataStream. Thanks.

aha_1980

HI @name101

glad you solved it. So please mark this topic as SOLVED too. Thanks