[Interest] Only buzzing sound while playing wav file through QAudioOutput

[Anisha Kaul]

I realised that the wav file which I was trying to play was not actually a
wav file. That was just a compressed mpeg with an extension wav.

With this program a real wav is easily played.

My bad. Sorry.

On 12 August 2016 at 16:38, Maurice Kalinowski <Maurice.Kalinowski at qt.io>
wrote:

> Hi,
>
>
>
> Please note that a wav file is a _*container*_ format, meaning it starts
> with a header describing the audio format and then continues with chunks of
> data. For more details have a look here: https://de.wikipedia.org/wiki/
> RIFF_WAVE
>
>
>
> This means that you will need to parse the header and provide the data,
> not just a file as QIODevice which is meant to be a data stream after you
> have set up the format correctly.
>
>
>
> Maurice
>
>
>
>
>
> *From:* Interest [mailto:interest-bounces+maurice.kalinowski=qt.io at qt-
> project.org] *On Behalf Of *Anisha Kaul
> *Sent:* Friday, August 12, 2016 12:31 PM
> *To:* interest at qt-project.org
> *Subject:* [Interest] Only buzzing sound while playing wav file through
> QAudioOutput
>
>
>
> Hi,
>
>
>
> This time I tried playing a wav file, but I cannot hear anything else than
> a buzzing sound.
>
> Platform is windows if that matters.
>
>
>
> This time the code is in main.cpp.
>
>
>
> Please guide.
>
> ************************************************************
> ***********************************
>
> #include <QCoreApplication>
>
> #include <QAudioOutput>
>
> #include <QFile>
>
> #include <QDebug>
>
>
>
> int main(int argc, char *argv[])
>
> {
>
>     QCoreApplication a(argc, argv);
>
>
>
>     QAudioOutput* audioOutpu;
>
>
>
>     QFile sourceFile;
>
>     sourceFile.setFileName("c.wav");
>
>     bool p = sourceFile.*open*(QIODevice::ReadOnly);
>
>     if (p == false)
>
>         qDebug() << "no file";
>
>     else
>
>         qDebug() << "yes file";
>
>
>
>
>
>     QAudioDeviceInfo d1;
>
>     QList<QAudioDeviceInfo> l1 = d1.availableDevices(QAudio::AudioOutput);
>
>
>
>     qDebug() << "======================================================";
>
>     qDebug() << l1.first().supportedCodecs();
>
>     qDebug() << l1.first().supportedChannelCounts();
>
>     qDebug() << l1.first().supportedSampleTypes();
>
>     qDebug() << l1.first().supportedSampleRates();
>
>     qDebug() << l1.first().supportedSampleSizes();
>
>
>
>     QAudioFormat desiredFormat1;
>
>     desiredFormat1.setChannelCount(2);
>
>     desiredFormat1.setByteOrder(QAudioFormat::LittleEndian);
>
>     desiredFormat1.setCodec("audio/pcm");
>
>     desiredFormat1.setSampleType(QAudioFormat::SignedInt);
>
>     desiredFormat1.setSampleRate(44100);
>
>     desiredFormat1.setSampleSize(16);
>
>
>
>     QAudioDeviceInfo info1(QAudioDeviceInfo::defaultOutputDevice());
>
>     if (!info1.isFormatSupported(desiredFormat1))
>
>     {
>
>            qWarning() << "Default format not supported, trying to use the nearest.";
>
>            desiredFormat1 = info1.preferredFormat();
>
>     }
>
>
>
>     audioOutpu = new QAudioOutput(desiredFormat1);
>
>     audioOutpu->setVolume(1.0);
>
>
>
>     audioOutpu->start(&sourceFile);
>
>     qDebug() << "bbbbbbbbbb";
>
>
>
>     return a.exec();
>
> }
>
>
>
> ************************************************************
> **************************************
>
> Output:
>
>
>
> ("audio/pcm")
>
> (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
>
> (SignedInt, UnSignedInt, Float)
>
> (8000, 11025, 16000, 22050, 32000, 44100, 48000, 88200, 96000, 192000)
>
> (8, 16, 24, 32, 48, 64)
>
> bbbbbbbbbb
>
>
>
>
>
>


-- 
Anisha Kaul
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