How to record software generated audio ??
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Dear all,
I'm trying to encode and to save as AAC audio file a stream generated via software by my app.
My first idea was to use the QMediaRecorder for that, but I cannot find a way to use it setting as audio input my generated stream. It seems that supports only hardware input devices :-S
So, there is no way to use Qt Multimedia module to create apps for generating musics ??Thanks,
Gianluca. -
take a look at QAudioInput and QAudioOutput classes
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I did !
But they are not useful for what I need to do.
They are low-level access to the audio streams... but again, they allow to attach an hardware device to a software buffer... and they do not encode nothing.What I need is to encode an audio stream generated from me and not from an hardware device.
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sure you can write a stream to a file using these classes. See "this example":http://qt-project.org/doc/qt-5/qaudioinput.html#details in the docs. You just have to worry about the supported codecs.
Alternatively "this":https://github.com/visore/QAudioCoder might also be interesting for you.
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I'll take a look to the github project.
And for what concern the example you posted... in the example the audio stream comes from the hardware device and it's not what I need.
I'll try to explain in more details what I need:
- there is a C++ method that generate an audio stream of data (RAW audio, suppose PCM 16bit unsigned)
- I want to connect this stream of data to one of the multimedia classes for encode it into AAC and saving on the disk in MP4 format.
From what I saw in the multimedia classes, the audio stream was always coming from an hardware device and not from a buffer or a QIODevice.
So, I'm wondering what I miss.Another scenario similar to what I need:
suppose you need to convert a file from AAC/MP4 to Vorbis/Ogg
So, digging into the multimedia documentation there is the QAudioDecoder that allow you to load and decode the AAC/MP4 file ... but then ?!?!
What multimedia class allow you to write the decoded audio into Vorbis/Ogg ?!?! QMediaRecorder ?!?! but how to connect to QAudioDecoder ?!?!
