How to to Audio Recording from microphone to wav file in Qt
-
Hi,
Open Qt Creator -> Welcome -> Examples, and search for "Audio Recorder Example". Are you able to use that to produce a wav file?
-
hey JKSH i am able to create wav file but when i tried to add this file in matlab am getting error that invalid wav file..incorrevt chunk size.......
my code is given below:
@QAudioEncoderSettings settings; settings.setCodec(“audio/pcm”); settings.setSampleRate(ui->lineEdit->text().toInt());
settings.setBitRate(ui->lineEdit_2->text().toInt()); settings.setQuality(QMultimedia::HighQuality); settings.setEncodingMode(QMultimedia::ConstantQualityEncoding); audioRecorder->setEncodingSettings(settings, QVideoEncoderSettings(),“audio/x-wav”); audioRecorder->setContainerFormat(“wav”); audioRecorder->setOutputLocation(QUrl(“C:/Users/Kaptron3/Desktop/testprabhat5.wav”)); audioRecorder->record();
-
Hi prabhatjha,
Yes I saw your code in your previous post.
However, I meant: Are you able to produce a .wav file using the Audio Recorder Example in Qt Creator?
Also, what happens if you open the .wav file in Windows Media Player?
-
hmmm i am able to produce a .wav file and i am also able to play this file in media player properly.........but when i added this file in matlab it showing inavalid wav file .....and invalid chunk size.....
-
Then I don't think there's anything wrong with the .wav file.
Are you sure your MATLAB code is correct? See http://www.mathworks.com.au/matlabcentral/newsreader/view_thread/108000
-
ya i am sure i used wavread command in matlab through which we read the wav file in matlab........i am able to read other wave file from this command.....
when i created .amr file from qt and changed this file in .wav through internet i can read this file in matlab.......so i think there is something chunk size issue ... -
Can you upload a sample .wav file somewhere?
-
hey i have no idea how to upload my .wav file here.....
tell me your mail id ...i can send my .wav file on your mail id.
thanks for ur reply... -
Sorry for the delay. You can upload your file to a file hosting site (Dropbox, Google Drive, Microsoft OneDrive, etc.) and post the link here.
-
-
Hey, i did recording from microphone using qt in .wav file.
i am able to play this file in media playe.but when i added this file in matlab for wavread this is giving a error invalid chunk size …..
and throgh matlab code i fixed the chunk size of my .wav file .
the matlab code is given below….
function wavchunksizefix( test13)
d = dir(‘test13.wav’);
fileSize = d.bytes
fid=fopen(‘test13.wav’,‘r+’,‘l’);
fseek(fid,4,-1);
fwrite(fid,fileSize-8,‘uint32’);
fseek(fid,40,-1);
fwrite(fid,fileSize-44,‘uint32’);
fclose(fid);
but i want to fix this problem throgh qt code.
plzzz give me some hint. -
Hi,
I downloaded your .wav file and followed the diagram at https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
Your file size is 956132 bytes.
Inside the file,
- Byte 4: ChunkSize = 956124 (= fileSize-8)
- Byte 40: Subchunk2Size = 956080
ChunkSize is correct, but Subchunk2Size is wrong (it should be 956088).
So you are right, the WAVE file that QMediaRecorder produced has a wrong value. This is a bug, but I don't know where the bug came from. Qt uses the Windows multimedia backend to record audio.
Can you check if you can produce a "good" wave file, using Windows Sound Recorder? (If you use Windows 7 or 8, follow this: http://social.technet.microsoft.com/Forums/windows/en-US/bd9563fe-a3ec-49c3-8b28-a2f8ed1082eb/record-wav-audio )
If Sound Recorder works, then it's likely to be a Qt bug. Please submit a bug report to http://bugreports.qt-project.org/
